Code:
/ Dotnetfx_Win7_3.5.1 / Dotnetfx_Win7_3.5.1 / 3.5.1 / DEVDIV / depot / DevDiv / releases / Orcas / NetFXw7 / wpf / src / Core / CSharp / System / Windows / Media3D / Visual3D.cs / 1 / Visual3D.cs
//----------------------------------------------------------------------------
//
//
// Copyright (c) Microsoft Corporation. All rights reserved.
//
//
// Description:
//
// History:
// 6/8/2005 : [....] - Created
//
//---------------------------------------------------------------------------
using MS.Internal;
using MS.Internal.Media;
using MS.Internal.Media3D;
using MS.Internal.PresentationCore;
using System;
using System.Diagnostics;
using System.Security;
using System.Windows.Media.Composition;
using System.Windows.Media;
using SR=MS.Internal.PresentationCore.SR;
using SRID=MS.Internal.PresentationCore.SRID;
namespace System.Windows.Media.Media3D
{
///
/// Visual3D is the base class for all 3D visual elements.
///
public abstract partial class Visual3D : DependencyObject, DUCE.IResource, IVisual3DContainer
{
// -------------------------------------------------------------------
//
// Constants
//
// -------------------------------------------------------------------
#region Constants
///
/// This is the dirty mask for a visual, set every time we marshall
/// a visual to a channel and reset by the end of the render pass.
///
private const VisualProxyFlags c_Model3DVisualProxyFlagsDirtyMask =
VisualProxyFlags.IsSubtreeDirtyForRender
| VisualProxyFlags.IsContentDirty
| VisualProxyFlags.IsTransformDirty;
#endregion Constants
//------------------------------------------------------
//
// Constructors
//
//-----------------------------------------------------
#region Constructors
// Prevent 3rd parties from extending this abstract base class.
internal Visual3D()
{
_internalIsVisible = true;
}
#endregion Constructors
// --------------------------------------------------------------------
//
// IResource implementation
//
// --------------------------------------------------------------------
#region IResource implementation
///
/// This is used to check if the composition node
/// for the visual is on channel
///
///
///
/// Returns the handle this visual has on the given channel.
///
///
///
/// Returns the handle this visual has on the given channel.
/// Note: The 3D handle is the normal handle for Visual3D
///
DUCE.ResourceHandle DUCE.IResource.Get3DHandle(DUCE.Channel channel)
{
return _proxy.GetHandle(channel);
}
///
/// This is used to create or addref the visual resource
/// on the given channel
///
///
///
/// Sends a command to compositor to remove the child
/// from its parent on the channel.
///
void DUCE.IResource.RemoveChildFromParent(
DUCE.IResource parent,
DUCE.Channel channel)
{
DUCE.Visual3DNode.RemoveChild(
parent.Get3DHandle(channel),
_proxy.GetHandle(channel),
channel);
}
int DUCE.IResource.GetChannelCount()
{
return _proxy.Count;
}
DUCE.Channel DUCE.IResource.GetChannel(int index)
{
return _proxy.GetChannel(index);
}
#endregion IResource implementation
//-----------------------------------------------------
//
// Public Methods
//
//------------------------------------------------------
#region Public Methods
///
/// DependencyProperty which backs the ModelVisual3D.Transform property.
///
public static readonly DependencyProperty TransformProperty =
DependencyProperty.Register(
"Transform",
/* propertyType = */ typeof(Transform3D),
/* ownerType = */ typeof(Visual3D),
new PropertyMetadata(Transform3D.Identity, TransformPropertyChanged),
(ValidateValueCallback) delegate { return MediaContext.CurrentMediaContext.WriteAccessEnabled; });
private static void TransformPropertyChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
Visual3D owner = ((Visual3D) d);
if (!e.IsASubPropertyChange)
{
if (e.OldValue != null)
{
owner.DisconnectAttachedResource(
VisualProxyFlags.IsTransformDirty,
((DUCE.IResource) e.OldValue));
}
owner.SetFlagsOnAllChannels(true, VisualProxyFlags.IsTransformDirty);
}
// NTRAID#Longhorn-1614112-2006/05/25-[....] - Stop over-invalidating _bboxSubgraph
//
// We currently maintain a cache of both a ModelVisual3D’s content
// and subgraph bounds. A better solution that would be both a 2D
// and 3D win would be to stop invalidating _bboxSubgraph when a
// visual’s transform changes.
owner.RenderChanged(/* sender = */ owner, EventArgs.Empty);
}
///
/// Transform for this Visual3D.
///
public Transform3D Transform
{
get
{
return (Transform3D) GetValue(TransformProperty);
}
set
{
SetValue(TransformProperty, value);
}
}
#endregion Public Methods
//-----------------------------------------------------
//
// Public Properties
//
//-----------------------------------------------------
//-----------------------------------------------------
//
// Public Events
//
//------------------------------------------------------
//-----------------------------------------------------
//
// Protected Methods
//
//------------------------------------------------------
#region Protected Methods
///
/// AttachChild
///
/// Derived classes must call this method to notify the Visual3D layer that a new
/// child appeard in the children collection. The Visual3D layer will then call the GetVisual3DChild
/// method to find out where the child was added.
///
/// Remark: To move a Visual3D child in a collection it must be first disconnected and then connected
/// again. (Moving forward we might want to add a special optimization there so that we do not
/// unmarshal our composition resources).
///
protected void AddVisual3DChild(Visual3D child)
{
// It is invalid to modify the children collection that we
// might be iterating during a property invalidation tree walk.
if (IsVisualChildrenIterationInProgress)
{
throw new InvalidOperationException(SR.Get(SRID.CannotModifyVisualChildrenDuringTreeWalk));
}
Debug.Assert(child != null);
Debug.Assert(child.InternalVisualParent == null);
child.SetParent(this);
// set the inheritance context so databinding, etc... work
ProvideSelfAsInheritanceContext(child, null);
// The child already might be dirty. Hence we need to propagate dirty information
// from the parent and from the child.
Visual3D.PropagateFlags(
this,
VisualFlags.IsSubtreeDirtyForPrecompute,
VisualProxyFlags.IsSubtreeDirtyForRender);
Visual3D.PropagateFlags(
child,
VisualFlags.IsSubtreeDirtyForPrecompute,
VisualProxyFlags.IsSubtreeDirtyForRender);
//
// Fire notifications
OnVisualChildrenChanged(child, /* visualRemoved = */ null);
child.FireOnVisualParentChanged(null);
}
///
/// DisconnectChild
///
/// Derived classes must call this method to notify the Visual3D layer that a
/// child was removed from the children collection. The Visual3D layer will then call
/// GetVisual3DChild to find out which child has been removed.
///
///
protected void RemoveVisual3DChild(Visual3D child)
{
// It is invalid to modify the children collection that we
// might be iterating during a property invalidation tree walk.
if (IsVisualChildrenIterationInProgress)
{
throw new InvalidOperationException(SR.Get(SRID.CannotModifyVisualChildrenDuringTreeWalk));
}
Debug.Assert(child != null);
Debug.Assert(child.InternalVisualParent == this);
child.SetParent(/* newParent = */ (Visual3D) null); // CS0121: Call is ambigious without casting null to Visual3D.
// remove the inheritance context
RemoveSelfAsInheritanceContext(child, null);
//
// Remove the child on all the channels
// this visual is being marshalled to.
//
for (int i = 0, limit = _proxy.Count; i < limit; i++)
{
DUCE.Channel channel = _proxy.GetChannel(i);
if (child.CheckFlagsAnd(channel, VisualProxyFlags.IsConnectedToParent))
{
channel.AddToRemoveAndReleaseQueue(
this,
child);
child.SetFlags(channel, false, VisualProxyFlags.IsConnectedToParent);
}
}
//
// Force a full precompute and render pass for this visual.
//
Visual3D.PropagateFlags(
this,
VisualFlags.IsSubtreeDirtyForPrecompute,
VisualProxyFlags.IsSubtreeDirtyForRender);
//
// Fire notifications
child.FireOnVisualParentChanged(this);
OnVisualChildrenChanged(/* visualAdded = */ null , child);
}
///
/// The InternalIsVisible property roughly corresponds to the Opacity in the Visual world.
/// When it is set to true, then the actual transform used for this visual on the MIL side
/// is set to a zero scale transform. This makes the object invisible.
///
internal bool InternalIsVisible
{
get
{
return _internalIsVisible;
}
set
{
if (_internalIsVisible != value)
{
// if we're going from Not Visible -> Visibile remove the zero scale from the Channel
// otherwise remove the user's transform
if (value)
{
DisconnectAttachedResource(
VisualProxyFlags.IsTransformDirty,
((DUCE.IResource)_zeroScale));
}
else
{
Transform3D transform = Transform;
if (transform != null)
{
DisconnectAttachedResource(
VisualProxyFlags.IsTransformDirty,
((DUCE.IResource)transform));
}
}
SetFlagsOnAllChannels(true, VisualProxyFlags.IsTransformDirty);
RenderChanged(/* sender = */ this, EventArgs.Empty);
_internalIsVisible = value;
}
}
}
// isSubpropertyChange indicates whether a subproperty on Visual3DModel changed.
// In this case oldValue is ignored, since the value hasn't changed. If it isn't a
// sub property change, then oldValue gives the previous value of the Visual3DModel property.
private void Visual3DModelPropertyChanged(Model3D oldValue, bool isSubpropertyChange)
{
if (!isSubpropertyChange)
{
if (oldValue != null)
{
DisconnectAttachedResource(VisualProxyFlags.IsContentDirty,
oldValue);
}
SetFlagsOnAllChannels(true, VisualProxyFlags.IsContentDirty);
}
SetFlags(false, VisualFlags.Are3DContentBoundsValid);
RenderChanged(/* sender = */ this, EventArgs.Empty);
}
private void Visual3DModelPropertyChanged(object o, EventArgs e)
{
// forward on to the main property changed method. Since this method is
// only called on subproperty chanes, oldValue is meaningless.
Visual3DModelPropertyChanged(null, /* isSubpropertyChange = */ true);
}
///
/// The Model3D to render
///
protected Model3D Visual3DModel
{
get
{
VerifyAPIReadOnly();
return _visual3DModel;
}
set
{
VerifyAPIReadWrite();
if (value != _visual3DModel)
{
// remove the old change listener
if (_visual3DModel != null && !_visual3DModel.IsFrozenInternal)
{
_visual3DModel.ChangedInternal -= Visual3DModelPropertyChanged;
}
// notify of the property change
Visual3DModelPropertyChanged(_visual3DModel, /* isSubpropertyChange = */ false);
_visual3DModel = value;
// set the new one
if (_visual3DModel != null && !_visual3DModel.IsFrozenInternal)
{
_visual3DModel.ChangedInternal += Visual3DModelPropertyChanged;
}
}
}
}
///
/// This is called when the parent link of the Visual is changed.
/// This method executes important base functionality before calling the
/// overridable virtual.
///
/// Old parent or null if the Visual did not have a parent before.
internal virtual void FireOnVisualParentChanged(DependencyObject oldParent)
{
// Call the ParentChanged virtual before firing the Ancestor Changed Event
OnVisualParentChanged(oldParent);
// If we are attaching to a tree then
// send the bit up if we need to.
if (oldParent == null)
{
Debug.Assert(VisualTreeHelper.GetParent(this) != null, "If oldParent is null, current parent should != null.");
if(CheckFlagsAnd(VisualFlags.SubTreeHoldsAncestorChanged))
{
Visual.SetTreeBits(
VisualTreeHelper.GetParent(this),
VisualFlags.SubTreeHoldsAncestorChanged,
VisualFlags.RegisteredForAncestorChanged);
}
}
// If we are cutting a sub tree off then
// clear the bit in the main tree above if we need to.
else
{
if (CheckFlagsAnd(VisualFlags.SubTreeHoldsAncestorChanged))
{
Visual.ClearTreeBits(
oldParent,
VisualFlags.SubTreeHoldsAncestorChanged,
VisualFlags.RegisteredForAncestorChanged);
}
}
// Fire the Ancestor changed Event on the nodes.
AncestorChangedEventArgs args = new AncestorChangedEventArgs(this, oldParent);
ProcessAncestorChangedNotificationRecursive(this, args);
}
///
/// Add removed delegates to the VisualAncenstorChanged Event.
///
///
/// This also sets/clears the tree-searching bit up the tree
///
internal event Visual.AncestorChangedEventHandler VisualAncestorChanged
{
add
{
Visual.AncestorChangedEventHandler newHandler = AncestorChangedEventField.GetValue(this);
if (newHandler == null)
{
newHandler = value;
}
else
{
newHandler += value;
}
AncestorChangedEventField.SetValue(this, newHandler);
Visual.SetTreeBits(
this,
VisualFlags.SubTreeHoldsAncestorChanged,
VisualFlags.RegisteredForAncestorChanged);
}
remove
{
// check that we are Disabling a node that was previously Enabled
if(CheckFlagsAnd(VisualFlags.SubTreeHoldsAncestorChanged))
{
Visual.ClearTreeBits(
this,
VisualFlags.SubTreeHoldsAncestorChanged,
VisualFlags.RegisteredForAncestorChanged);
}
// if we are Disabling a Visual that was not Enabled then this
// search should fail. But it is safe to check.
Visual.AncestorChangedEventHandler newHandler = AncestorChangedEventField.GetValue(this);
if (newHandler != null)
{
newHandler -= value;
if(newHandler == null)
{
AncestorChangedEventField.ClearValue(this);
}
else
{
AncestorChangedEventField.SetValue(this, newHandler);
}
}
}
}
///
/// Walks down in the tree for nodes that have AncestorChanged Handlers
/// registered and calls them.
/// It uses Flag bits that help it prune the walk. This should go
/// straight to the relevent nodes.
///
internal static void ProcessAncestorChangedNotificationRecursive(DependencyObject e, AncestorChangedEventArgs args)
{
if (e is Visual)
{
Visual.ProcessAncestorChangedNotificationRecursive(e, args);
}
else
{
Visual3D eAsVisual3D = e as Visual3D;
// If the flag is not set, then we are Done.
if(!eAsVisual3D.CheckFlagsAnd(VisualFlags.SubTreeHoldsAncestorChanged))
{
return;
}
// If there is a handler on this node, then fire it.
Visual.AncestorChangedEventHandler handler = AncestorChangedEventField.GetValue(eAsVisual3D);
if(handler != null)
{
handler(eAsVisual3D, args);
}
// Decend into the children.
int count = eAsVisual3D.InternalVisual2DOr3DChildrenCount;
for (int i = 0; i < count; i++)
{
DependencyObject child = eAsVisual3D.InternalGet2DOr3DVisualChild(i);
if (child != null)
{
Visual3D.ProcessAncestorChangedNotificationRecursive(child, args);
}
}
}
}
///
/// OnVisualParentChanged is called when the parent of the Visual is changed.
///
/// Old parent or null if the Visual did not have a parent before.
protected internal virtual void OnVisualParentChanged(DependencyObject oldParent)
{
}
///
/// OnVisualChildrenChanged is called when the VisualCollection of the Visual is edited.
///
protected internal virtual void OnVisualChildrenChanged(
DependencyObject visualAdded,
DependencyObject visualRemoved)
{
}
#endregion Protected Methods
//------------------------------------------------------
//
// Internal Methods
//
//-----------------------------------------------------
#region Internal Methods
internal bool DoesRayHitSubgraphBounds(RayHitTestParameters rayParams)
{
Point3D origin;
Vector3D direction;
rayParams.GetLocalLine(out origin, out direction);
Rect3D bboxSubgraph = VisualDescendantBounds;
return LineUtil.ComputeLineBoxIntersection(ref origin, ref direction, ref bboxSubgraph, rayParams.IsRay);
}
///
/// Initiate a hit test using delegates.
///
internal void HitTest(
HitTestFilterCallback filterCallback,
HitTestResultCallback resultCallback,
HitTestParameters3D hitTestParameters)
{
if (resultCallback == null)
{
throw new ArgumentNullException("resultCallback");
}
if (hitTestParameters == null)
{
throw new ArgumentNullException("hitTestParameters");
}
VerifyAPIReadWrite();
RayHitTestParameters rayParams = hitTestParameters as RayHitTestParameters;
if (rayParams != null)
{
// In case the user is reusing the same RayHitTestParameters
rayParams.ClearResults();
HitTestResultBehavior result = RayHitTest(filterCallback, rayParams);
rayParams.RaiseCallback(resultCallback, filterCallback, result);
}
else
{
// This should never happen, users can not extend the abstract HitTestParameters3D class.
Invariant.Assert(false,
String.Format(System.Globalization.CultureInfo.InvariantCulture,
"'{0}' HitTestParameters3D are not supported on {1}.",
hitTestParameters.GetType().Name, this.GetType().Name));
}
}
internal HitTestResultBehavior RayHitTest(
HitTestFilterCallback filterCallback,
RayHitTestParameters rayParams)
{
if (DoesRayHitSubgraphBounds(rayParams))
{
//
// Determine if there is a special filter behavior defined for this
// Visual.
//
HitTestFilterBehavior behavior = HitTestFilterBehavior.Continue;
if (filterCallback != null)
{
behavior = filterCallback(this);
if (HTFBInterpreter.SkipSubgraph(behavior)) return HitTestResultBehavior.Continue;
if (HTFBInterpreter.Stop(behavior)) return HitTestResultBehavior.Stop;
}
//
// Hit test against the children.
//
if (HTFBInterpreter.IncludeChildren(behavior))
{
HitTestResultBehavior result = HitTestChildren(filterCallback, rayParams);
if (result == HitTestResultBehavior.Stop) return HitTestResultBehavior.Stop;
}
//
// Hit test against the content of this Visual.
//
if (HTFBInterpreter.DoHitTest(behavior))
{
RayHitTestInternal(filterCallback, rayParams);
}
}
return HitTestResultBehavior.Continue;
}
internal HitTestResultBehavior HitTestChildren(
HitTestFilterCallback filterCallback,
RayHitTestParameters rayParams)
{
return HitTestChildren(filterCallback, rayParams, this);
}
///
/// Static helper used by ModelVisual3D and Viewport3DVisual to hit test
/// against their children collections.
///
internal static HitTestResultBehavior HitTestChildren(
HitTestFilterCallback filterCallback,
RayHitTestParameters rayParams,
IVisual3DContainer container)
{
if (container != null)
{
int childrenCount = container.GetChildrenCount();
for (int i = childrenCount - 1; i >= 0; i--)
{
Visual3D child = container.GetChild(i);
// Visuall3D.RayHitTest does not apply the Visual3D's Transform. We need to
// transform into the content's space before hit testing.
Transform3D transform = child.Transform;
rayParams.PushVisualTransform(transform);
// Perform the hit-test against the child.
HitTestResultBehavior result = child.RayHitTest(filterCallback, rayParams);
rayParams.PopTransform(transform);
if (result == HitTestResultBehavior.Stop)
{
return HitTestResultBehavior.Stop;
}
}
}
return HitTestResultBehavior.Continue;
}
internal void RayHitTestInternal(
HitTestFilterCallback filterCallback,
RayHitTestParameters rayParams)
{
Model3D model = _visual3DModel;
if (model != null)
{
// If our Model3D hit test intersects anything we should return "this" Visual3D
// as the HitTestResult.VisualHit.
rayParams.CurrentVisual = this;
model.RayHitTest(rayParams);
}
}
///
/// Generic "render changed" handler which sets IsDirtyForRender
/// and propagates IsSubtreeDirtyForRender/Precompute.
///
internal void RenderChanged(object sender, EventArgs e)
{
PropagateFlags(
this,
VisualFlags.IsSubtreeDirtyForPrecompute,
VisualProxyFlags.IsSubtreeDirtyForRender);
}
///
/// VisualContentBounds returns the bounding box for the contents of the current visual.
///
internal Rect3D VisualContentBounds
{
get
{
// Probably too restrictive. Let's see who wants it during OnRender.
VerifyAPIReadWrite();
return GetContentBounds();
}
}
///
/// Visual2DContentBounds returns the 2D bounding box for the content of this 3D object. The 2D bounding box
/// is the projection of the 3D content bounding box up to the nearest 2D visual that contains the Visual3D.
///
[FriendAccessAllowed]
internal Rect Visual2DContentBounds
{
get
{
VerifyAPIReadWrite();
Rect contentBounds = Rect.Empty;
Viewport3DVisual viewport3DVisual = (Viewport3DVisual)VisualTreeHelper.GetContainingVisual2D(this);
if (viewport3DVisual != null) {
GeneralTransform3DTo2D transform = TransformToAncestor(viewport3DVisual);
contentBounds = transform.TransformBounds(VisualContentBounds);
}
return contentBounds;
}
}
// Returns true if the content has something requiring realization
internal bool PrecomputeContent()
{
Model3D model = _visual3DModel;
if (model != null)
{
// The Visual3D may be dirty for precompute because of its
// children not because of its Content so we'll check before
// calling
if (model._flags[Model3D.DirtyForPreComputeFlag])
{
model.PreCompute();
}
return model._flags[Model3D.RequiresRealizationFlag];
}
return false;
}
internal Rect3D BBoxSubgraph
{
get
{
if (CheckFlagsAnd(VisualFlags.IsSubtreeDirtyForPrecompute))
{
// force an update of the bounds cache
Rect3D transformedBBoxSubgraphIgnored;
PrecomputeRecursive(out transformedBBoxSubgraphIgnored);
}
Debug_VerifyCachedSubgraphBounds();
return _bboxSubgraph;
}
}
///
/// Derived classes must override this method and return the bounding
/// box of their content in the Visual's local space.
///
internal Rect3D GetContentBounds()
{
Model3D model = _visual3DModel;
if (model == null)
{
return Rect3D.Empty;
}
if (!CheckFlagsAnd(VisualFlags.Are3DContentBoundsValid))
{
_bboxContent = model.CalculateSubgraphBoundsOuterSpace();
SetFlags(true, VisualFlags.Are3DContentBoundsValid);
}
Debug_VerifyCachedContentBounds();
return _bboxContent;
}
///
/// Returns the subgraph bounds in the Visual3D's outer coordinate space.
///
internal Rect3D CalculateSubgraphBoundsOuterSpace()
{
Rect3D bounds = CalculateSubgraphBoundsInnerSpace();
return M3DUtil.ComputeTransformedAxisAlignedBoundingBox(ref bounds, Transform);
}
///
/// Returns the subgraph bounds in the Visual3D's inner coordinate space.
///
internal Rect3D CalculateSubgraphBoundsInnerSpace()
{
return BBoxSubgraph;
}
///
/// VisualDescendantBounds returns the union of all of the content bounding
/// boxes for all of the descendants of the current visual, but not including
/// the contents of the current visual.
///
internal Rect3D VisualDescendantBounds
{
get
{
// Probably too restrictive. Let's see who wants it during OnRender.
VerifyAPIReadWrite();
return CalculateSubgraphBoundsInnerSpace();
}
}
// CS0536: Intreface implementation must be public or explicit so we re-expose
// the internal methods as an explicit implementation of an internal interface.
void IVisual3DContainer.VerifyAPIReadOnly() { this.VerifyAPIReadOnly(); }
void IVisual3DContainer.VerifyAPIReadOnly(DependencyObject other) { this.VerifyAPIReadOnly(other); }
void IVisual3DContainer.VerifyAPIReadWrite() { this.VerifyAPIReadWrite(); }
void IVisual3DContainer.VerifyAPIReadWrite(DependencyObject other) { this.VerifyAPIReadWrite(other); }
///
/// Applies various API checks
///
internal void VerifyAPIReadOnly()
{
// Verify that we are executing on the right context
VerifyAccess();
}
///
/// Applies various API checks
///
internal void VerifyAPIReadOnly(DependencyObject other)
{
VerifyAPIReadOnly();
if (other != null)
{
// Make sure the visual is on the same context as we are
MediaSystem.AssertSameContext(this, other);
}
}
///
/// Applies various API checks for read/write
///
internal void VerifyAPIReadWrite()
{
VerifyAPIReadOnly();
// Verify the correct access permissions
MediaContext.From(this.Dispatcher).VerifyWriteAccess();
}
///
/// Applies various API checks
///
internal void VerifyAPIReadWrite(DependencyObject other)
{
VerifyAPIReadWrite();
if (other != null)
{
// Make sure the visual is on the same context as we are
MediaSystem.AssertSameContext(this, other);
}
}
internal void SetParent(Visual newParent)
{
_2DParent.SetValue(this, newParent);
_3DParent = null;
Debug.Assert(InternalVisualParent == newParent);
}
internal void SetParent(Visual3D newParent)
{
_2DParent.ClearValue(this);
_3DParent = newParent;
Debug.Assert(InternalVisualParent == newParent);
}
///
/// Derived classes override this property to enable the Visual code to enumerate
/// the Visual children. Derived classes need to return the number of children
/// from this method.
///
/// By default a Visual does not have any children.
///
/// Remark: During this virtual method the Visual tree must not be modified.
///
protected virtual int Visual3DChildrenCount
{
get { return 0; }
}
///
/// Derived class must implement to support Visual children. The method must return
/// the child at the specified index. Index must be between 0 and GetVisualChildrenCount-1.
///
/// By default a Visual does not have any children.
///
/// Remark:
/// Need to lock down Visual tree during the callbacks.
/// During this virtual call it is not valid to modify the Visual tree.
///
/// It is okay to type this protected API to the 2D Visual. The only 2D Visual with
/// 3D childern is the Viewport3DVisual which is sealed. -- [....] 01/17/06
///
protected virtual Visual3D GetVisual3DChild(int index)
{
throw new ArgumentOutOfRangeException("index", index, SR.Get(SRID.Visual_ArgumentOutOfRange));
}
///
/// Notifies the element that you have added a child. The Element
/// will update the parent pointer, fire the correct events, etc.
///
void IVisual3DContainer.AddChild(Visual3D child)
{
AddVisual3DChild(child);
}
///
/// Notifies the element that you have removed a child. The Element
/// will update the parent pointer, fire the correct events, etc.
///
void IVisual3DContainer.RemoveChild(Visual3D child)
{
RemoveVisual3DChild(child);
}
///
/// Gets the number of Visual3D children that the IVisual3DContainer
/// contains.
///
int IVisual3DContainer.GetChildrenCount()
{
return Visual3DChildrenCount;
}
///
/// Gets the index children of the IVisual3DContainer
///
Visual3D IVisual3DContainer.GetChild(int index)
{
return GetVisual3DChild(index);
}
//------------------------------------------------------
//
// DEBUG
//
//-----------------------------------------------------
#region DEBUG
[Conditional("DEBUG")]
internal void Debug_VerifyBoundsEqual(Rect3D bounds1, Rect3D bounds2, string errorString)
{
// The funny boolean logic below avoids asserts when the cached
// bounds contain NaNs. (NaN != NaN)
bool boundsAreEqual =
!(bounds1.X < bounds2.X || bounds1.X > bounds2.X) &&
!(bounds1.Y < bounds2.Y || bounds1.Y > bounds2.Y) &&
!(bounds1.Z < bounds2.Z || bounds1.Z > bounds2.Z) &&
!(bounds1.SizeX < bounds2.SizeX || bounds1.SizeX > bounds2.SizeX) &&
!(bounds1.SizeY < bounds2.SizeY || bounds1.SizeY > bounds2.SizeY) &&
!(bounds1.SizeZ < bounds2.SizeZ || bounds1.SizeZ > bounds2.SizeZ);
Debug.Assert(boundsAreEqual, errorString);
}
[Conditional("DEBUG")]
internal void Debug_VerifyCachedSubgraphBounds()
{
Rect3D currentBounds = Rect3D.Empty;
#if DEBUG
currentBounds = Debug_CalculateSubgraphBounds();
#endif
// currentBounds includes Transform so we need to
// temporarily transform _bboxSubgraph
Rect3D cachedBounds = M3DUtil.ComputeTransformedAxisAlignedBoundingBox(ref _bboxSubgraph, Transform);
Debug_VerifyBoundsEqual(cachedBounds, currentBounds, "Cached bbox subgraph is incorrect!");
}
[Conditional("DEBUG")]
internal void Debug_VerifyCachedContentBounds()
{
Model3D model = _visual3DModel;
Debug.Assert(model != null);
Debug_VerifyBoundsEqual(model.CalculateSubgraphBoundsOuterSpace(),
_bboxContent, "Cached content bounds is incorrect!");
}
// [Conditional] does not work on methods that return values
#if DEBUG
internal Rect3D Debug_CalculateSubgraphBounds()
{
Rect3D currentSubgraphBounds = GetContentBounds();
for (int i = 0, count = Visual3DChildrenCount; i < count; i++)
{
currentSubgraphBounds.Union(
GetVisual3DChild(i).Debug_CalculateSubgraphBounds()
);
}
return M3DUtil.ComputeTransformedAxisAlignedBoundingBox(ref currentSubgraphBounds, Transform);
}
#endif
#endregion DEBUG
///
/// Precompute pass.
///
internal void PrecomputeRecursive(out Rect3D bboxSubgraph)
{
if (CheckFlagsAnd(VisualFlags.IsSubtreeDirtyForPrecompute))
{
//
// Track which subtrees have nodes that use realization caches.
//
bool subTreeUsesRealizationCaches = false;
subTreeUsesRealizationCaches |= PrecomputeContent();
//
// Update the subgraph bounding box which includes the content bounds
// and the bounds of our children.
//
_bboxSubgraph = GetContentBounds();
for (int i = 0, count = Visual3DChildrenCount; i < count; i++)
{
Visual3D child = GetVisual3DChild(i);
Rect3D bboxSubgraphChild;
child.PrecomputeRecursive(out bboxSubgraphChild);
_bboxSubgraph.Union(bboxSubgraphChild);
subTreeUsesRealizationCaches |=
child.CheckFlagsAnd(VisualFlags.NodeInSubtreeUsesRealizationCaches);
}
//
// Update the NodeInSubtreeUsesRealizationCaches bit.
//
subTreeUsesRealizationCaches |= CheckFlagsAnd(VisualFlags.NodeUsesRealizationCaches);
SetFlags(subTreeUsesRealizationCaches, VisualFlags.NodeInSubtreeUsesRealizationCaches);
SetFlags(false, VisualFlags.IsSubtreeDirtyForPrecompute);
}
bboxSubgraph = M3DUtil.ComputeTransformedAxisAlignedBoundingBox(ref _bboxSubgraph, Transform);
}
internal void RenderRecursive(RenderContext ctx)
{
DUCE.Channel channel = ctx.Channel;
DUCE.ResourceHandle handle = DUCE.ResourceHandle.Null;
VisualProxyFlags flags = c_Model3DVisualProxyFlagsDirtyMask;
//
// Ensure that the resource for this Visual is sent to our current channel.
//
bool isOnChannel = IsOnChannel(channel);
if (isOnChannel)
{
//
// Good, we're already on channel. Get the handle and the flags.
//
handle = _proxy.GetHandle(channel);
flags = _proxy.GetFlags(channel);
}
else
{
//
// Create the visual resource on the current channel.
//
// Note: we need to update all set properties (the dirty
// bit mask is set by default).
//
handle = ((DUCE.IResource)this).AddRefOnChannel(channel);
}
//
// Hookup content to the Visual
//
if ((flags & VisualProxyFlags.IsContentDirty) != 0)
{
RenderContent(ctx, isOnChannel);
}
//
// Update the transform.
//
if ((flags & VisualProxyFlags.IsTransformDirty) != 0)
{
Transform3D transform = Transform;
if (transform != null && InternalIsVisible)
{
//
// Set the new transform resource for this visual. If transform is
// null we don't need to do this. Also note that the old transform
// was disconnected in the Transform property setter.
//
DUCE.Visual3DNode.SetTransform(
handle,
((DUCE.IResource)transform).AddRefOnChannel(channel),
channel);
}
else if (!InternalIsVisible)
{
DUCE.Visual3DNode.SetTransform(
handle,
((DUCE.IResource)_zeroScale).AddRefOnChannel(channel),
channel);
}
else if (!isOnChannel) /* Transform == null */
{
DUCE.Visual3DNode.SetTransform(
handle,
DUCE.ResourceHandle.Null,
channel);
}
}
// Visit children of this node -----------------------------------------------------------------------
Debug.Assert((flags & VisualProxyFlags.IsContentNodeConnected) == 0,
"Only HostVisuals are expected to have a content node.");
for (int i = 0; i < Visual3DChildrenCount; i++)
{
Visual3D child = GetVisual3DChild(i);
if (child != null)
{
if (child.CheckFlagsAnd(channel, VisualProxyFlags.IsSubtreeDirtyForRender) || // or the visual is dirty
!(child.IsOnChannel(channel))) // or the child has not been marshalled yet.
{
child.RenderRecursive(ctx);
}
if (child.IsOnChannel(ctx.Channel))
{
if (!child.CheckFlagsAnd(channel, VisualProxyFlags.IsConnectedToParent))
{
DUCE.Visual3DNode.InsertChildAt(
handle,
((DUCE.IResource)child).GetHandle(channel),
/* iPosition = */ (uint)i,
ctx.Channel);
child.SetFlags(channel, true, VisualProxyFlags.IsConnectedToParent);
}
}
}
}
//
// Finally, reset the dirty flags for this visual (at this point,
// we have handled them all).
//
SetFlags(channel, false, c_Model3DVisualProxyFlagsDirtyMask);
}
///
/// RenderContent is implemented to hook up the Visual3Ds content.
/// The implementer of this function can assert that the _hCompNode
/// is valid on a channel when the function is executed.
///
internal void RenderContent(RenderContext ctx, bool isOnChannel)
{
DUCE.Channel channel = ctx.Channel;
Debug.Assert(!CheckFlagsAnd(channel, VisualProxyFlags.IsContentConnected));
Debug.Assert(IsOnChannel(channel));
//
// Create the content on the channel.
//
if (_visual3DModel != null)
{
//
// Attach the content to the visual resource
//
DUCE.Visual3DNode.SetContent(
((DUCE.IResource)this).GetHandle(channel),
((DUCE.IResource)_visual3DModel).AddRefOnChannel(channel),
channel);
SetFlags(channel, true, VisualProxyFlags.IsContentConnected);
}
else if (isOnChannel) /* Model == null */
{
DUCE.Visual3DNode.SetContent(
((DUCE.IResource)this).GetHandle(channel),
DUCE.ResourceHandle.Null,
channel);
}
}
///
/// Returns true if the specified ancestor is really the ancestor of the
/// given descendant.
///
public bool IsAncestorOf(DependencyObject descendant)
{
Visual visual;
Visual3D visual3D;
VisualTreeUtils.AsNonNullVisual(descendant, out visual, out visual3D);
// x86 branch prediction skips the branch on first encounter. We favor 3D.
if(visual != null)
{
return visual.IsDescendantOf(this);
}
return visual3D.IsDescendantOf(this);
}
///
/// Returns true if the refernece Visual (this) is a descendant of the argument Visual.
///
public bool IsDescendantOf(DependencyObject ancestor)
{
if (ancestor == null)
{
throw new ArgumentNullException("ancestor");
}
VisualTreeUtils.EnsureVisual(ancestor);
// Walk up the parent chain of the descendant untill we run out
// of 3D parents or we find the ancestor.
Visual3D current = this;
while (current != null && current != ancestor)
{
// If our 3D parent is null then continue walk in 2D
if (current._3DParent == null)
{
DependencyObject parent2D = current.InternalVisualParent;
if (parent2D != null)
{
// The type has to be Visual because of the above if condition
return ((Visual)parent2D).IsDescendantOf(ancestor);
}
}
current = current._3DParent;
}
return current == ancestor;
}
///
/// Walks up the Visual tree setting or clearing the given flags. Unlike
/// PropagateFlags this does not terminate when it reaches node with
/// the flags already set. It always walks all the way to the root.
///
internal void SetFlagsToRoot(bool value, VisualFlags flag)
{
Visual3D current = this;
do
{
current.SetFlags(value, flag);
if (current._3DParent == null)
{
VisualTreeUtils.SetFlagsToRoot(InternalVisualParent, value, flag);
return;
}
current = current._3DParent;
}
while (current != null);
}
///
/// Finds the first ancestor of the given element which has the given
/// flags set.
///
internal DependencyObject FindFirstAncestorWithFlagsAnd(VisualFlags flag)
{
Visual3D current = this;
do
{
if (current.CheckFlagsAnd(flag))
{
// The other Visual crossed through this Visual's parent chain. Hence this is our
// common ancestor.
return current;
}
if (current._3DParent == null)
{
return VisualTreeUtils.FindFirstAncestorWithFlagsAnd(InternalVisualParent, flag);
}
current = current._3DParent;
}
while (current != null);
return null;
}
///
/// Finds the common ancestor of two Visuals.
///
/// Returns the common ancestor if the Visuals have one or otherwise null.
/// If the argument is null.
public DependencyObject FindCommonVisualAncestor(DependencyObject otherVisual)
{
VerifyAPIReadOnly(otherVisual);
if (otherVisual == null)
{
throw new System.ArgumentNullException("otherVisual");
}
// Since we can't rely on code running in the CLR, we need to first make sure
// that the FindCommonAncestor flag is not set. It is enought to ensure this
// on one path to the root Visual.
//
SetFlagsToRoot(false, VisualFlags.FindCommonAncestor);
// Walk up the other visual's parent chain and set the FindCommonAncestor flag.
VisualTreeUtils.SetFlagsToRoot(otherVisual, true, VisualFlags.FindCommonAncestor);
// Now see if the other Visual's parent chain crosses our parent chain.
return FindFirstAncestorWithFlagsAnd(VisualFlags.FindCommonAncestor);
}
///
/// Override this function in derived classes to release unmanaged resources during Dispose
/// and during removal of a subtree.
///
internal void FreeDUCEResources(DUCE.Channel channel)
{
Transform3D transform = Transform;
if (!CheckFlagsAnd(channel, VisualProxyFlags.IsTransformDirty))
{
if (InternalIsVisible)
{
if (transform != null)
{
((DUCE.IResource)transform).ReleaseOnChannel(channel);
}
}
else
{
((DUCE.IResource)_zeroScale).ReleaseOnChannel(channel);
}
}
Model3D model = _visual3DModel;
if ((model != null) && (!CheckFlagsAnd(channel, VisualProxyFlags.IsContentDirty)))
{
((DUCE.IResource)model).ReleaseOnChannel(channel);
}
Debug.Assert(IsOnChannel(channel));
Debug.Assert(!CheckFlagsAnd(channel, VisualProxyFlags.IsContentNodeConnected));
_proxy.ReleaseOnChannel(channel);
}
void DUCE.IResource.ReleaseOnChannel(DUCE.Channel channel)
{
ReleaseOnChannelCore(channel);
}
internal void ReleaseOnChannelCore(DUCE.Channel channel)
{
if (!IsOnChannel(channel))
{
return;
}
// at this point the tree is not connected any more.
SetFlags(channel, false, VisualProxyFlags.IsConnectedToParent);
FreeDUCEResources(channel);
for (int i = 0; i < Visual3DChildrenCount; i++)
{
Visual3D child = GetVisual3DChild(i);
((DUCE.IResource)child).ReleaseOnChannel(channel);
}
}
///
/// Disconnects a resource attached to this visual.
///
internal void DisconnectAttachedResource(
VisualProxyFlags correspondingFlag,
DUCE.IResource attachedResource)
{
//
// Iterate over the channels this visual is being marshaled to
//
for (int i = 0; i < _proxy.Count; i++)
{
VisualProxyFlags flags = _proxy.GetFlags(i);
if ((flags & correspondingFlag) == 0)
{
DUCE.Channel channel = _proxy.GetChannel(i);
//
// Set the flag so that during render we send
// update to the compositor.
//
SetFlags(channel, true, correspondingFlag);
if (correspondingFlag == VisualProxyFlags.IsContentDirty)
{
_proxy.SetFlags(i, false, VisualProxyFlags.IsContentConnected);
}
//
// Add this resource to the queue for delayed-removal.
//
channel.AddToRemoveAndReleaseQueue(
null,
attachedResource);
}
}
}
internal void UpdateRealizations(RealizationContext rc)
{
Debug.Assert(CheckFlagsAnd(VisualFlags.NodeInSubtreeUsesRealizationCaches));
Matrix3DStack stack3D = rc.Transform3DStack;
Transform3D transform = Transform;
if (transform != null)
{
stack3D.Push(transform.Value);
}
Model3D model = _visual3DModel;
// It's possible that NodeInSubtreeUsesRealizationCaches is 'true' for
// one of the children but not the Model so we still check the ProtectedContent
if (model != null && model._flags[Model3D.RequiresRealizationFlag])
{
model.MarkVisibleRealizations(rc);
}
// should this know about children?
for (int i = 0; i < Visual3DChildrenCount; i++)
{
Visual3D child = GetVisual3DChild(i);
if (child.CheckFlagsAnd(VisualFlags.NodeInSubtreeUsesRealizationCaches))
{
child.UpdateRealizations(rc);
}
}
if (transform != null)
{
stack3D.Pop();
}
}
// Normally the inheritence context is the same as our parent. When it differs,
// we store the value in the _inheritanceContext UncommonField. See comments
// on the _inheritanceContext and UseParentAsContext members for more info.
internal override DependencyObject InheritanceContext
{
get
{
DependencyObject value = _inheritanceContext.GetValue(this);
if (value == UseParentAsContext)
{
return InternalVisualParent;
}
return value;
}
}
internal override void AddInheritanceContext(DependencyObject context, DependencyProperty property)
{
base.AddInheritanceContext(context, property);
// Call local helper
AddOrRemoveInheritanceContext(context);
}
internal override void RemoveInheritanceContext(DependencyObject context, DependencyProperty property)
{
base.RemoveInheritanceContext(context, property);
// Call local helper
AddOrRemoveInheritanceContext(null);
}
// Local helping for adding or removing an inheritance context
private void AddOrRemoveInheritanceContext(DependencyObject newInheritanceContext)
{
// If we are using our parent as our inheritance context the InheritanceContext
// property will already be returning the new context, but we still need to treat
// this as a change so we notify our dependants.
bool contextChanged =
InheritanceContext != newInheritanceContext ||
(_inheritanceContext.GetValue(this) == UseParentAsContext &&
newInheritanceContext == InternalVisualParent);
if (contextChanged)
{
// Pick up the new context
SetInheritanceContext(newInheritanceContext);
OnInheritanceContextChanged(EventArgs.Empty);
}
}
internal override bool HasMultipleInheritanceContexts
{
get { return base.HasMultipleInheritanceContexts; }
}
internal override void OnInheritanceContextChangedCore(EventArgs args) // ancestor changed
{
base.OnInheritanceContextChangedCore(args);
for (int i = 0; i < Visual3DChildrenCount; i++)
{
DependencyObject child = GetVisual3DChild(i);
Debug.Assert(child.InheritanceContext == this,
"How did a child get inserted without propagating our inheritance context?");
child.OnInheritanceContextChanged(args);
}
}
#endregion Internal Methods
// -------------------------------------------------------------------
//
// Visual-to-Visual Transforms
//
// --------------------------------------------------------------------
#region Visual-to-Visual Transforms
///
/// Returns a transform that can be used to transform coordinates from this
/// node to the specified ancestor, or null if the transformation cannot be created.
/// 2D is allowed to be between the 3D nodes.
///
///
/// If ancestor is null.
///
///
/// If the ancestor Visual3D is not a ancestor of Visual3D.
///
/// If the Visual3Ds are not connected.
public GeneralTransform3D TransformToAncestor(Visual3D ancestor)
{
if (ancestor == null)
{
throw new ArgumentNullException("ancestor");
}
VerifyAPIReadOnly(ancestor);
return InternalTransformToAncestor(ancestor, false);
}
///
/// Returns a transform that can be used to transform coordinates from this
/// node to the specified descendant, or null if the transform from descendant to "this"
/// is non-invertible. This is the case when 2D is between the nodes.
///
///
///
/// If the reference Visual3D is not a ancestor of the descendant Visual3D.
///
/// If the descendant argument is null.
/// If the Visual3Ds are not connected.
public GeneralTransform3D TransformToDescendant(Visual3D descendant)
{
if (descendant == null)
{
throw new ArgumentNullException("descendant");
}
VerifyAPIReadOnly(descendant);
return descendant.InternalTransformToAncestor(this, true);
}
///
/// Returns the transform or the inverse transform between this visual and the specified ancestor.
/// If inverse is requested but does not exist (if the transform is not invertible), null is returned.
///
/// Ancestor visual.
/// Returns inverse if this argument is true.
private GeneralTransform3D InternalTransformToAncestor(Visual3D ancestor, bool inverse)
{
Debug.Assert(ancestor != null);
// used to track if all the collected transforms on the way to the ancestor were valid
bool success = true;
DependencyObject g = this;
Visual3D lastVisual3D = null;
Matrix3D m = Matrix3D.Identity;
GeneralTransform3DGroup group = null;
// This while loop will walk up the visual tree until we encounter the ancestor.
// As it does so, it will accumulate the descendent->ancestor transform.
// In most cases, this is simply a matrix, though if we encounter a 2D node we need to
// transform from 3D out in to 2D and then back in to 3D and continue the parent walk.
// We will accumulate the current transform in a matrix until we encounter a 2D parent,
// at which point we will add the matrix's current value and the transform from 3D to 2D to 3D
// to the GeneralTransform3DGroup and continue to accumulate further transforms in the matrix again.
// At the end of this loop, we will have 0 or more transforms in the GeneralTransform3DGroup
// and the matrix which, if not identity, should be appended to the GeneralTransform3DGroup.
// If, as is commonly the case, this loop terminates without encountering a 2D parent
// we will simply use the Matrix3D.
while ((VisualTreeHelper.GetParent(g) != null) && (g != ancestor))
{
Visual3D gAsVisual3D = g as Visual3D;
if (gAsVisual3D != null)
{
Transform3D transform = gAsVisual3D.Transform;
if (transform != null)
{
transform.Append(ref m);
}
lastVisual3D = gAsVisual3D;
g = VisualTreeHelper.GetParent(gAsVisual3D);
}
else
{
if (group == null)
{
group = new GeneralTransform3DGroup();
}
group.Children.Add(new MatrixTransform3D(m));
m = Matrix3D.Identity;
// construct the 3D to 2D to 3D transform
Visual gAsVisual = g as Visual;
GeneralTransform3DTo2D transform3DTo2D = lastVisual3D.TransformToAncestor(gAsVisual);
// now find the 3D parent of the 2D object
Visual3D containing3DParent = VisualTreeHelper.GetContainingVisual3D(gAsVisual);
// if containing3DParent is null, then the ancestor parameter is not really an ancestor
// break out of the loop to allow it to fail
if (containing3DParent == null)
{
break;
}
GeneralTransform2DTo3D transform2DTo3D = gAsVisual.TransformToAncestor(containing3DParent);
// if either transform ends up being null then we don't have a transform
if (transform3DTo2D == null || transform2DTo3D == null)
{
// we don't want to break here because although we own't be able to create a valid transformation
// we also want to throw an exception if the ancestor passed in is not a valid ancestor. We then
// continue the tree walk to make sure.
success = false;
}
else
{
group.Children.Add(new GeneralTransform3DTo2DTo3D(transform3DTo2D, transform2DTo3D));
}
// the last visual3D found is where we continue the search
g = containing3DParent;
}
}
if (g != ancestor)
{
throw new System.InvalidOperationException(SR.Get(inverse ? SRID.Visual_NotADescendant : SRID.Visual_NotAnAncestor));
}
// construct the generaltransform3d to return and invert it if necessary
GeneralTransform3D finalTransform = null;
// if we successfully found a transform then we can create it here, otherwise finalTransform stays null
if (success)
{
if (group != null)
{
finalTransform = group;
}
else
{
finalTransform = new MatrixTransform3D(m);
}
if (inverse)
{
finalTransform = finalTransform.Inverse;
}
}
if (finalTransform != null)
{
finalTransform.Freeze();
}
return finalTransform;
}
///
/// Returns a transform that can be used to transform coordinate from this
/// node to the specified ancestor, or null if the transform does not exist.
/// This transform will take a 3D point, and then project it in to 2D space.
/// The resulting point is the transformed 3D point in the coordinate space
/// of the given ancestor.
///
///
///
/// If ancestor is null.
///
///
/// If the ancestor Visual is not an ancestor of this.
///
/// If the Visual3D and Visual are not connected.
public GeneralTransform3DTo2D TransformToAncestor(Visual ancestor)
{
if (ancestor == null)
{
throw new ArgumentNullException("ancestor");
}
VerifyAPIReadOnly(ancestor);
return InternalTransformToAncestor(ancestor);
}
///
/// Provides the transform between this visual3D and the specified ancestor, or null
/// if the transform does not exist.
///
///
/// Ancestor visual.
/// The transform from 3D to 2D
internal GeneralTransform3DTo2D InternalTransformToAncestor(Visual ancestor)
{
Debug.Assert(ancestor != null);
// get the transform out of 3D and in to 2D
Viewport3DVisual containingViewport;
Matrix3D projectionTransform;
if (!M3DUtil.TryTransformToViewport3DVisual(this, out containingViewport, out projectionTransform))
{
return null;
}
// get the transform from the Viewport3DVisual to the ancestor
GeneralTransform transformIn2D = containingViewport.TransformToAncestor(ancestor);
// package the two up in the transformTo2D
GeneralTransform3DTo2D result = new GeneralTransform3DTo2D(projectionTransform, transformIn2D);
result.Freeze();
return result;
}
#endregion Visual-to-Visual Transforms
//-----------------------------------------------------
//
// Internal Properties
//
//------------------------------------------------------
#region Internal Properties
internal DependencyObject InternalVisualParent
{
get
{
if (_3DParent != null)
{
Debug.Assert(_2DParent.GetValue(this) == null,
"Only one parent pointer should be set at a time.");
return _3DParent;
}
DependencyObject parent2D = _2DParent.GetValue(this);
Debug.Assert(parent2D == null || parent2D is Viewport3DVisual,
"The only acceptable 2D parent for a Visual3D is a Viewport3DVisual.");
return parent2D;
}
}
internal int ParentIndex
{
get { return _parentIndex; }
set { _parentIndex = value; }
}
// Are we in the process of iterating the visual children.
// This flag is set during a descendents walk, for property invalidation.
internal bool IsVisualChildrenIterationInProgress
{
[FriendAccessAllowed]
get { return CheckFlagsAnd(VisualFlags.IsVisualChildrenIterationInProgress); }
[FriendAccessAllowed]
set { SetFlags(value, VisualFlags.IsVisualChildrenIterationInProgress); }
}
#endregion Internal Properties
// --------------------------------------------------------------------
//
// Visual flags manipulation
//
// -------------------------------------------------------------------
#region Visual flags manipulation
///
/// SetFlagsOnAllChannels is used to set or unset one
/// or multiple flags on all channels this visual is
/// marshaled to.
///
internal void SetFlagsOnAllChannels(
bool value,
VisualProxyFlags flagsToChange)
{
_proxy.SetFlagsOnAllChannels(
value,
flagsToChange);
}
///
/// SetFlags is used to set or unset one or multiple flags on a given channel.
///
internal void SetFlags(
DUCE.Channel channel,
bool value,
VisualProxyFlags flagsToChange)
{
_proxy.SetFlags(
channel,
value,
flagsToChange);
}
///
/// SetFlags is used to set or unset one or multiple node flags on the node.
///
internal void SetFlags(bool value, VisualFlags Flags)
{
_flags = value ? (_flags | Flags) : (_flags & (~Flags));
}
///
/// CheckFlagsOnAllChannels returns true if all flags in
/// the bitmask flags are set on all channels this visual is
/// marshaled to.
///
///
/// If there aren't any bits set on the specified flags
/// the method returns true.
///
internal bool CheckFlagsOnAllChannels(VisualProxyFlags flagsToCheck)
{
return _proxy.CheckFlagsOnAllChannels(flagsToCheck);
}
///
/// CheckFlagsAnd returns true if all flags in the bitmask flags
/// are set on a given channel.
///
///
/// If there aren't any bits set on the specified flags
/// the method returns true.
///
internal bool CheckFlagsAnd(
DUCE.Channel channel,
VisualProxyFlags flagsToCheck)
{
return (_proxy.GetFlags(channel) & flagsToCheck) == flagsToCheck;
}
///
/// CheckFlagsAnd returns true if all flags in the bitmask flags are set on the node.
///
/// If there aren't any bits set on the specified flags the method
/// returns true
internal bool CheckFlagsAnd(VisualFlags flags)
{
return (_flags & flags) == flags;
}
///
/// Returns the child at index "index" (in most cases this will be
/// a Visual, but it some cases, Viewport3DVisual for instance,
/// this is a Visual3D).
///
/// Used only by VisualTreeHelper.
///
internal virtual DependencyObject InternalGet2DOr3DVisualChild(int index)
{
// Call the right virtual method.
return GetVisual3DChild(index);
}
///
/// Returns the number of children of this object (in most cases this will be
/// the number of Visuals, but it some cases, Viewport3DVisual for instance,
/// this is the number of Visual3Ds).
///
/// Used only by VisualTreeHelper.
///
internal virtual int InternalVisual2DOr3DChildrenCount
{
get
{
// Call the right virtual method.
return Visual3DChildrenCount;
}
}
///
/// Checks if any of the specified flags is set on a given channel.
///
///
/// If there aren't any bits set on the specified flags
/// the method returns true.
///
internal bool CheckFlagsOr(
DUCE.Channel channel,
VisualProxyFlags flagsToCheck)
{
return (_proxy.GetFlags(channel) & flagsToCheck) != VisualProxyFlags.None;
}
///
/// Checks if any of the specified flags is set on the node.
///
/// If there aren't any bits set on the specified flags the method
/// returns true
internal bool CheckFlagsOr(VisualFlags flags)
{
return (flags == 0) || ((_flags & flags) > 0);
}
///
/// Check all the children for a bit.
///
internal static bool DoAnyChildrenHaveABitSet(Visual3D pe,
VisualFlags flag)
{
int count = pe.InternalVisual2DOr3DChildrenCount;
for (int i = 0; i < count; i++)
{
DependencyObject child = pe.InternalGet2DOr3DVisualChild(i);
Visual v = null;
Visual3D v3D = null;
VisualTreeUtils.AsNonNullVisual(child, out v, out v3D);
if (v != null && v.CheckFlagsAnd(flag))
{
return true;
}
else if (v3D != null && v3D.CheckFlagsAnd(flag))
{
return true;
}
}
return false;
}
///
/// Propagates the flags up to the root.
///
///
/// The walk stops on a node with all of the required flags set.
///
internal static void PropagateFlags(
Visual3D e,
VisualFlags flags,
VisualProxyFlags proxyFlags)
{
while ((e != null) &&
(!e.CheckFlagsAnd(flags) || !e.CheckFlagsOnAllChannels(proxyFlags)))
{
// These asserts are mostly for documentation when diffing the 2D/3D
// implementations.
Debug.Assert(!e.CheckFlagsOr(VisualFlags.ShouldPostRender),
"Visual3Ds should never be the root of a tree.");
Debug.Assert(!e.CheckFlagsOr(VisualFlags.NodeIsVisualBrushRoot),
"Visual3Ds should never be the root of a VisualBrush.");
e.SetFlags(true, flags);
e.SetFlagsOnAllChannels(true, proxyFlags);
// If our 3D parent is null call back into VisualTreeUtils to potentially
// continue the walk in 2D.
if (e._3DParent == null)
{
Viewport3DVisual viewport = e.InternalVisualParent as Viewport3DVisual;
Debug.Assert((viewport == null) == (e.InternalVisualParent == null),
"Viewport3DVisual is the only supported 2D parent of a 3D visual.");
if(viewport != null)
{
// We must notify the 2D visual that its contents have changed.
// This will cause the 2D visual to set it's content dirty flag
// and continue the propagation of IsDirtyForRender/Precompute.
viewport.Visual3DTreeChanged();
// continue propagating flags up the 2D world
Visual.PropagateFlags(viewport, flags, proxyFlags);
}
// Stop propagating. We are at the root of the 3D subtree.
return;
}
e = e._3DParent;
}
}
#endregion Visual flags manipulation
//------------------------------------------------------
//
// Private Methods
//
//-----------------------------------------------------
#region Private Methods
private void SetInheritanceContext(DependencyObject newInheritanceContext)
{
if (newInheritanceContext == InternalVisualParent)
{
_inheritanceContext.ClearValue(this);
Debug.Assert(_inheritanceContext.GetValue(this) == UseParentAsContext,
"Clearing the _inheritanceContext uncommon field should put us in the UseParentAsContext state.");
}
else
{
_inheritanceContext.SetValue(this, newInheritanceContext);
}
}
#endregion Private Methods
//-----------------------------------------------------
//
// Internal Fields
//
//-----------------------------------------------------
#region Internal Fields
internal VisualProxy _proxy;
#endregion Internal Fields
//------------------------------------------------------
//
// Private Fields
//
//-----------------------------------------------------
#region Private Fields
// If the parent of the Visual3D is another Visual3D we store the parent in the _3DParent field.
// If the parent is a 2D node (as is the case when this is the root of a Viewport3DVisual) we
// store the parent in an UncommonField. Both fields must be considered when determining
// the parent of this node.
private static readonly UncommonField _2DParent =
new UncommonField(/* defaultValue = */ null);
// Sentinel value we use to differentiate between a null inheritance context stored in the
// _inheritanceContext uncommon field and "empty", meaning use the parent as context.
private static readonly DependencyObject UseParentAsContext = new DependencyObject();
// Normally the inheritance context is the same as the parent, except when we are parent to
// a Viewport3D visual, in which case we use this uncommon field to store are alternate context.
private static readonly UncommonField _inheritanceContext =
new UncommonField(/* defaultValue = */ UseParentAsContext);
private static readonly UncommonField AncestorChangedEventField
= new UncommonField();
private Visual3D _3DParent;
private int _parentIndex = -1;
private VisualFlags _flags;
// Untransformed *cached* content bounds. Do not access it directly -- instead
// use GetContentBounds()
private Rect3D _bboxContent;
// Untransformed *cached* subgraph bounds. Do not access it directly -- instead
// use the BBoxSubgraph property.
private Rect3D _bboxSubgraph = Rect3D.Empty;
private bool _internalIsVisible;
private static readonly ScaleTransform3D _zeroScale = new ScaleTransform3D(0, 0, 0);
private Model3D _visual3DModel;
#endregion Private Fields
//------------------------------------------------------
//
// Protected Fields
//
//------------------------------------------------------
#region Protected Fields
#endregion Protected Fields
}
}
// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
//----------------------------------------------------------------------------
//
//
// Copyright (c) Microsoft Corporation. All rights reserved.
//
//
// Description:
//
// History:
// 6/8/2005 : [....] - Created
//
//---------------------------------------------------------------------------
using MS.Internal;
using MS.Internal.Media;
using MS.Internal.Media3D;
using MS.Internal.PresentationCore;
using System;
using System.Diagnostics;
using System.Security;
using System.Windows.Media.Composition;
using System.Windows.Media;
using SR=MS.Internal.PresentationCore.SR;
using SRID=MS.Internal.PresentationCore.SRID;
namespace System.Windows.Media.Media3D
{
///
/// Visual3D is the base class for all 3D visual elements.
///
public abstract partial class Visual3D : DependencyObject, DUCE.IResource, IVisual3DContainer
{
// -------------------------------------------------------------------
//
// Constants
//
// -------------------------------------------------------------------
#region Constants
///
/// This is the dirty mask for a visual, set every time we marshall
/// a visual to a channel and reset by the end of the render pass.
///
private const VisualProxyFlags c_Model3DVisualProxyFlagsDirtyMask =
VisualProxyFlags.IsSubtreeDirtyForRender
| VisualProxyFlags.IsContentDirty
| VisualProxyFlags.IsTransformDirty;
#endregion Constants
//------------------------------------------------------
//
// Constructors
//
//-----------------------------------------------------
#region Constructors
// Prevent 3rd parties from extending this abstract base class.
internal Visual3D()
{
_internalIsVisible = true;
}
#endregion Constructors
// --------------------------------------------------------------------
//
// IResource implementation
//
// --------------------------------------------------------------------
#region IResource implementation
///
/// This is used to check if the composition node
/// for the visual is on channel
///
///
///
/// Returns the handle this visual has on the given channel.
///
///
///
/// Returns the handle this visual has on the given channel.
/// Note: The 3D handle is the normal handle for Visual3D
///
DUCE.ResourceHandle DUCE.IResource.Get3DHandle(DUCE.Channel channel)
{
return _proxy.GetHandle(channel);
}
///
/// This is used to create or addref the visual resource
/// on the given channel
///
///
///
/// Sends a command to compositor to remove the child
/// from its parent on the channel.
///
void DUCE.IResource.RemoveChildFromParent(
DUCE.IResource parent,
DUCE.Channel channel)
{
DUCE.Visual3DNode.RemoveChild(
parent.Get3DHandle(channel),
_proxy.GetHandle(channel),
channel);
}
int DUCE.IResource.GetChannelCount()
{
return _proxy.Count;
}
DUCE.Channel DUCE.IResource.GetChannel(int index)
{
return _proxy.GetChannel(index);
}
#endregion IResource implementation
//-----------------------------------------------------
//
// Public Methods
//
//------------------------------------------------------
#region Public Methods
///
/// DependencyProperty which backs the ModelVisual3D.Transform property.
///
public static readonly DependencyProperty TransformProperty =
DependencyProperty.Register(
"Transform",
/* propertyType = */ typeof(Transform3D),
/* ownerType = */ typeof(Visual3D),
new PropertyMetadata(Transform3D.Identity, TransformPropertyChanged),
(ValidateValueCallback) delegate { return MediaContext.CurrentMediaContext.WriteAccessEnabled; });
private static void TransformPropertyChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
Visual3D owner = ((Visual3D) d);
if (!e.IsASubPropertyChange)
{
if (e.OldValue != null)
{
owner.DisconnectAttachedResource(
VisualProxyFlags.IsTransformDirty,
((DUCE.IResource) e.OldValue));
}
owner.SetFlagsOnAllChannels(true, VisualProxyFlags.IsTransformDirty);
}
// NTRAID#Longhorn-1614112-2006/05/25-[....] - Stop over-invalidating _bboxSubgraph
//
// We currently maintain a cache of both a ModelVisual3D’s content
// and subgraph bounds. A better solution that would be both a 2D
// and 3D win would be to stop invalidating _bboxSubgraph when a
// visual’s transform changes.
owner.RenderChanged(/* sender = */ owner, EventArgs.Empty);
}
///
/// Transform for this Visual3D.
///
public Transform3D Transform
{
get
{
return (Transform3D) GetValue(TransformProperty);
}
set
{
SetValue(TransformProperty, value);
}
}
#endregion Public Methods
//-----------------------------------------------------
//
// Public Properties
//
//-----------------------------------------------------
//-----------------------------------------------------
//
// Public Events
//
//------------------------------------------------------
//-----------------------------------------------------
//
// Protected Methods
//
//------------------------------------------------------
#region Protected Methods
///
/// AttachChild
///
/// Derived classes must call this method to notify the Visual3D layer that a new
/// child appeard in the children collection. The Visual3D layer will then call the GetVisual3DChild
/// method to find out where the child was added.
///
/// Remark: To move a Visual3D child in a collection it must be first disconnected and then connected
/// again. (Moving forward we might want to add a special optimization there so that we do not
/// unmarshal our composition resources).
///
protected void AddVisual3DChild(Visual3D child)
{
// It is invalid to modify the children collection that we
// might be iterating during a property invalidation tree walk.
if (IsVisualChildrenIterationInProgress)
{
throw new InvalidOperationException(SR.Get(SRID.CannotModifyVisualChildrenDuringTreeWalk));
}
Debug.Assert(child != null);
Debug.Assert(child.InternalVisualParent == null);
child.SetParent(this);
// set the inheritance context so databinding, etc... work
ProvideSelfAsInheritanceContext(child, null);
// The child already might be dirty. Hence we need to propagate dirty information
// from the parent and from the child.
Visual3D.PropagateFlags(
this,
VisualFlags.IsSubtreeDirtyForPrecompute,
VisualProxyFlags.IsSubtreeDirtyForRender);
Visual3D.PropagateFlags(
child,
VisualFlags.IsSubtreeDirtyForPrecompute,
VisualProxyFlags.IsSubtreeDirtyForRender);
//
// Fire notifications
OnVisualChildrenChanged(child, /* visualRemoved = */ null);
child.FireOnVisualParentChanged(null);
}
///
/// DisconnectChild
///
/// Derived classes must call this method to notify the Visual3D layer that a
/// child was removed from the children collection. The Visual3D layer will then call
/// GetVisual3DChild to find out which child has been removed.
///
///
protected void RemoveVisual3DChild(Visual3D child)
{
// It is invalid to modify the children collection that we
// might be iterating during a property invalidation tree walk.
if (IsVisualChildrenIterationInProgress)
{
throw new InvalidOperationException(SR.Get(SRID.CannotModifyVisualChildrenDuringTreeWalk));
}
Debug.Assert(child != null);
Debug.Assert(child.InternalVisualParent == this);
child.SetParent(/* newParent = */ (Visual3D) null); // CS0121: Call is ambigious without casting null to Visual3D.
// remove the inheritance context
RemoveSelfAsInheritanceContext(child, null);
//
// Remove the child on all the channels
// this visual is being marshalled to.
//
for (int i = 0, limit = _proxy.Count; i < limit; i++)
{
DUCE.Channel channel = _proxy.GetChannel(i);
if (child.CheckFlagsAnd(channel, VisualProxyFlags.IsConnectedToParent))
{
channel.AddToRemoveAndReleaseQueue(
this,
child);
child.SetFlags(channel, false, VisualProxyFlags.IsConnectedToParent);
}
}
//
// Force a full precompute and render pass for this visual.
//
Visual3D.PropagateFlags(
this,
VisualFlags.IsSubtreeDirtyForPrecompute,
VisualProxyFlags.IsSubtreeDirtyForRender);
//
// Fire notifications
child.FireOnVisualParentChanged(this);
OnVisualChildrenChanged(/* visualAdded = */ null , child);
}
///
/// The InternalIsVisible property roughly corresponds to the Opacity in the Visual world.
/// When it is set to true, then the actual transform used for this visual on the MIL side
/// is set to a zero scale transform. This makes the object invisible.
///
internal bool InternalIsVisible
{
get
{
return _internalIsVisible;
}
set
{
if (_internalIsVisible != value)
{
// if we're going from Not Visible -> Visibile remove the zero scale from the Channel
// otherwise remove the user's transform
if (value)
{
DisconnectAttachedResource(
VisualProxyFlags.IsTransformDirty,
((DUCE.IResource)_zeroScale));
}
else
{
Transform3D transform = Transform;
if (transform != null)
{
DisconnectAttachedResource(
VisualProxyFlags.IsTransformDirty,
((DUCE.IResource)transform));
}
}
SetFlagsOnAllChannels(true, VisualProxyFlags.IsTransformDirty);
RenderChanged(/* sender = */ this, EventArgs.Empty);
_internalIsVisible = value;
}
}
}
// isSubpropertyChange indicates whether a subproperty on Visual3DModel changed.
// In this case oldValue is ignored, since the value hasn't changed. If it isn't a
// sub property change, then oldValue gives the previous value of the Visual3DModel property.
private void Visual3DModelPropertyChanged(Model3D oldValue, bool isSubpropertyChange)
{
if (!isSubpropertyChange)
{
if (oldValue != null)
{
DisconnectAttachedResource(VisualProxyFlags.IsContentDirty,
oldValue);
}
SetFlagsOnAllChannels(true, VisualProxyFlags.IsContentDirty);
}
SetFlags(false, VisualFlags.Are3DContentBoundsValid);
RenderChanged(/* sender = */ this, EventArgs.Empty);
}
private void Visual3DModelPropertyChanged(object o, EventArgs e)
{
// forward on to the main property changed method. Since this method is
// only called on subproperty chanes, oldValue is meaningless.
Visual3DModelPropertyChanged(null, /* isSubpropertyChange = */ true);
}
///
/// The Model3D to render
///
protected Model3D Visual3DModel
{
get
{
VerifyAPIReadOnly();
return _visual3DModel;
}
set
{
VerifyAPIReadWrite();
if (value != _visual3DModel)
{
// remove the old change listener
if (_visual3DModel != null && !_visual3DModel.IsFrozenInternal)
{
_visual3DModel.ChangedInternal -= Visual3DModelPropertyChanged;
}
// notify of the property change
Visual3DModelPropertyChanged(_visual3DModel, /* isSubpropertyChange = */ false);
_visual3DModel = value;
// set the new one
if (_visual3DModel != null && !_visual3DModel.IsFrozenInternal)
{
_visual3DModel.ChangedInternal += Visual3DModelPropertyChanged;
}
}
}
}
///
/// This is called when the parent link of the Visual is changed.
/// This method executes important base functionality before calling the
/// overridable virtual.
///
/// Old parent or null if the Visual did not have a parent before.
internal virtual void FireOnVisualParentChanged(DependencyObject oldParent)
{
// Call the ParentChanged virtual before firing the Ancestor Changed Event
OnVisualParentChanged(oldParent);
// If we are attaching to a tree then
// send the bit up if we need to.
if (oldParent == null)
{
Debug.Assert(VisualTreeHelper.GetParent(this) != null, "If oldParent is null, current parent should != null.");
if(CheckFlagsAnd(VisualFlags.SubTreeHoldsAncestorChanged))
{
Visual.SetTreeBits(
VisualTreeHelper.GetParent(this),
VisualFlags.SubTreeHoldsAncestorChanged,
VisualFlags.RegisteredForAncestorChanged);
}
}
// If we are cutting a sub tree off then
// clear the bit in the main tree above if we need to.
else
{
if (CheckFlagsAnd(VisualFlags.SubTreeHoldsAncestorChanged))
{
Visual.ClearTreeBits(
oldParent,
VisualFlags.SubTreeHoldsAncestorChanged,
VisualFlags.RegisteredForAncestorChanged);
}
}
// Fire the Ancestor changed Event on the nodes.
AncestorChangedEventArgs args = new AncestorChangedEventArgs(this, oldParent);
ProcessAncestorChangedNotificationRecursive(this, args);
}
///
/// Add removed delegates to the VisualAncenstorChanged Event.
///
///
/// This also sets/clears the tree-searching bit up the tree
///
internal event Visual.AncestorChangedEventHandler VisualAncestorChanged
{
add
{
Visual.AncestorChangedEventHandler newHandler = AncestorChangedEventField.GetValue(this);
if (newHandler == null)
{
newHandler = value;
}
else
{
newHandler += value;
}
AncestorChangedEventField.SetValue(this, newHandler);
Visual.SetTreeBits(
this,
VisualFlags.SubTreeHoldsAncestorChanged,
VisualFlags.RegisteredForAncestorChanged);
}
remove
{
// check that we are Disabling a node that was previously Enabled
if(CheckFlagsAnd(VisualFlags.SubTreeHoldsAncestorChanged))
{
Visual.ClearTreeBits(
this,
VisualFlags.SubTreeHoldsAncestorChanged,
VisualFlags.RegisteredForAncestorChanged);
}
// if we are Disabling a Visual that was not Enabled then this
// search should fail. But it is safe to check.
Visual.AncestorChangedEventHandler newHandler = AncestorChangedEventField.GetValue(this);
if (newHandler != null)
{
newHandler -= value;
if(newHandler == null)
{
AncestorChangedEventField.ClearValue(this);
}
else
{
AncestorChangedEventField.SetValue(this, newHandler);
}
}
}
}
///
/// Walks down in the tree for nodes that have AncestorChanged Handlers
/// registered and calls them.
/// It uses Flag bits that help it prune the walk. This should go
/// straight to the relevent nodes.
///
internal static void ProcessAncestorChangedNotificationRecursive(DependencyObject e, AncestorChangedEventArgs args)
{
if (e is Visual)
{
Visual.ProcessAncestorChangedNotificationRecursive(e, args);
}
else
{
Visual3D eAsVisual3D = e as Visual3D;
// If the flag is not set, then we are Done.
if(!eAsVisual3D.CheckFlagsAnd(VisualFlags.SubTreeHoldsAncestorChanged))
{
return;
}
// If there is a handler on this node, then fire it.
Visual.AncestorChangedEventHandler handler = AncestorChangedEventField.GetValue(eAsVisual3D);
if(handler != null)
{
handler(eAsVisual3D, args);
}
// Decend into the children.
int count = eAsVisual3D.InternalVisual2DOr3DChildrenCount;
for (int i = 0; i < count; i++)
{
DependencyObject child = eAsVisual3D.InternalGet2DOr3DVisualChild(i);
if (child != null)
{
Visual3D.ProcessAncestorChangedNotificationRecursive(child, args);
}
}
}
}
///
/// OnVisualParentChanged is called when the parent of the Visual is changed.
///
/// Old parent or null if the Visual did not have a parent before.
protected internal virtual void OnVisualParentChanged(DependencyObject oldParent)
{
}
///
/// OnVisualChildrenChanged is called when the VisualCollection of the Visual is edited.
///
protected internal virtual void OnVisualChildrenChanged(
DependencyObject visualAdded,
DependencyObject visualRemoved)
{
}
#endregion Protected Methods
//------------------------------------------------------
//
// Internal Methods
//
//-----------------------------------------------------
#region Internal Methods
internal bool DoesRayHitSubgraphBounds(RayHitTestParameters rayParams)
{
Point3D origin;
Vector3D direction;
rayParams.GetLocalLine(out origin, out direction);
Rect3D bboxSubgraph = VisualDescendantBounds;
return LineUtil.ComputeLineBoxIntersection(ref origin, ref direction, ref bboxSubgraph, rayParams.IsRay);
}
///
/// Initiate a hit test using delegates.
///
internal void HitTest(
HitTestFilterCallback filterCallback,
HitTestResultCallback resultCallback,
HitTestParameters3D hitTestParameters)
{
if (resultCallback == null)
{
throw new ArgumentNullException("resultCallback");
}
if (hitTestParameters == null)
{
throw new ArgumentNullException("hitTestParameters");
}
VerifyAPIReadWrite();
RayHitTestParameters rayParams = hitTestParameters as RayHitTestParameters;
if (rayParams != null)
{
// In case the user is reusing the same RayHitTestParameters
rayParams.ClearResults();
HitTestResultBehavior result = RayHitTest(filterCallback, rayParams);
rayParams.RaiseCallback(resultCallback, filterCallback, result);
}
else
{
// This should never happen, users can not extend the abstract HitTestParameters3D class.
Invariant.Assert(false,
String.Format(System.Globalization.CultureInfo.InvariantCulture,
"'{0}' HitTestParameters3D are not supported on {1}.",
hitTestParameters.GetType().Name, this.GetType().Name));
}
}
internal HitTestResultBehavior RayHitTest(
HitTestFilterCallback filterCallback,
RayHitTestParameters rayParams)
{
if (DoesRayHitSubgraphBounds(rayParams))
{
//
// Determine if there is a special filter behavior defined for this
// Visual.
//
HitTestFilterBehavior behavior = HitTestFilterBehavior.Continue;
if (filterCallback != null)
{
behavior = filterCallback(this);
if (HTFBInterpreter.SkipSubgraph(behavior)) return HitTestResultBehavior.Continue;
if (HTFBInterpreter.Stop(behavior)) return HitTestResultBehavior.Stop;
}
//
// Hit test against the children.
//
if (HTFBInterpreter.IncludeChildren(behavior))
{
HitTestResultBehavior result = HitTestChildren(filterCallback, rayParams);
if (result == HitTestResultBehavior.Stop) return HitTestResultBehavior.Stop;
}
//
// Hit test against the content of this Visual.
//
if (HTFBInterpreter.DoHitTest(behavior))
{
RayHitTestInternal(filterCallback, rayParams);
}
}
return HitTestResultBehavior.Continue;
}
internal HitTestResultBehavior HitTestChildren(
HitTestFilterCallback filterCallback,
RayHitTestParameters rayParams)
{
return HitTestChildren(filterCallback, rayParams, this);
}
///
/// Static helper used by ModelVisual3D and Viewport3DVisual to hit test
/// against their children collections.
///
internal static HitTestResultBehavior HitTestChildren(
HitTestFilterCallback filterCallback,
RayHitTestParameters rayParams,
IVisual3DContainer container)
{
if (container != null)
{
int childrenCount = container.GetChildrenCount();
for (int i = childrenCount - 1; i >= 0; i--)
{
Visual3D child = container.GetChild(i);
// Visuall3D.RayHitTest does not apply the Visual3D's Transform. We need to
// transform into the content's space before hit testing.
Transform3D transform = child.Transform;
rayParams.PushVisualTransform(transform);
// Perform the hit-test against the child.
HitTestResultBehavior result = child.RayHitTest(filterCallback, rayParams);
rayParams.PopTransform(transform);
if (result == HitTestResultBehavior.Stop)
{
return HitTestResultBehavior.Stop;
}
}
}
return HitTestResultBehavior.Continue;
}
internal void RayHitTestInternal(
HitTestFilterCallback filterCallback,
RayHitTestParameters rayParams)
{
Model3D model = _visual3DModel;
if (model != null)
{
// If our Model3D hit test intersects anything we should return "this" Visual3D
// as the HitTestResult.VisualHit.
rayParams.CurrentVisual = this;
model.RayHitTest(rayParams);
}
}
///
/// Generic "render changed" handler which sets IsDirtyForRender
/// and propagates IsSubtreeDirtyForRender/Precompute.
///
internal void RenderChanged(object sender, EventArgs e)
{
PropagateFlags(
this,
VisualFlags.IsSubtreeDirtyForPrecompute,
VisualProxyFlags.IsSubtreeDirtyForRender);
}
///
/// VisualContentBounds returns the bounding box for the contents of the current visual.
///
internal Rect3D VisualContentBounds
{
get
{
// Probably too restrictive. Let's see who wants it during OnRender.
VerifyAPIReadWrite();
return GetContentBounds();
}
}
///
/// Visual2DContentBounds returns the 2D bounding box for the content of this 3D object. The 2D bounding box
/// is the projection of the 3D content bounding box up to the nearest 2D visual that contains the Visual3D.
///
[FriendAccessAllowed]
internal Rect Visual2DContentBounds
{
get
{
VerifyAPIReadWrite();
Rect contentBounds = Rect.Empty;
Viewport3DVisual viewport3DVisual = (Viewport3DVisual)VisualTreeHelper.GetContainingVisual2D(this);
if (viewport3DVisual != null) {
GeneralTransform3DTo2D transform = TransformToAncestor(viewport3DVisual);
contentBounds = transform.TransformBounds(VisualContentBounds);
}
return contentBounds;
}
}
// Returns true if the content has something requiring realization
internal bool PrecomputeContent()
{
Model3D model = _visual3DModel;
if (model != null)
{
// The Visual3D may be dirty for precompute because of its
// children not because of its Content so we'll check before
// calling
if (model._flags[Model3D.DirtyForPreComputeFlag])
{
model.PreCompute();
}
return model._flags[Model3D.RequiresRealizationFlag];
}
return false;
}
internal Rect3D BBoxSubgraph
{
get
{
if (CheckFlagsAnd(VisualFlags.IsSubtreeDirtyForPrecompute))
{
// force an update of the bounds cache
Rect3D transformedBBoxSubgraphIgnored;
PrecomputeRecursive(out transformedBBoxSubgraphIgnored);
}
Debug_VerifyCachedSubgraphBounds();
return _bboxSubgraph;
}
}
///
/// Derived classes must override this method and return the bounding
/// box of their content in the Visual's local space.
///
internal Rect3D GetContentBounds()
{
Model3D model = _visual3DModel;
if (model == null)
{
return Rect3D.Empty;
}
if (!CheckFlagsAnd(VisualFlags.Are3DContentBoundsValid))
{
_bboxContent = model.CalculateSubgraphBoundsOuterSpace();
SetFlags(true, VisualFlags.Are3DContentBoundsValid);
}
Debug_VerifyCachedContentBounds();
return _bboxContent;
}
///
/// Returns the subgraph bounds in the Visual3D's outer coordinate space.
///
internal Rect3D CalculateSubgraphBoundsOuterSpace()
{
Rect3D bounds = CalculateSubgraphBoundsInnerSpace();
return M3DUtil.ComputeTransformedAxisAlignedBoundingBox(ref bounds, Transform);
}
///
/// Returns the subgraph bounds in the Visual3D's inner coordinate space.
///
internal Rect3D CalculateSubgraphBoundsInnerSpace()
{
return BBoxSubgraph;
}
///
/// VisualDescendantBounds returns the union of all of the content bounding
/// boxes for all of the descendants of the current visual, but not including
/// the contents of the current visual.
///
internal Rect3D VisualDescendantBounds
{
get
{
// Probably too restrictive. Let's see who wants it during OnRender.
VerifyAPIReadWrite();
return CalculateSubgraphBoundsInnerSpace();
}
}
// CS0536: Intreface implementation must be public or explicit so we re-expose
// the internal methods as an explicit implementation of an internal interface.
void IVisual3DContainer.VerifyAPIReadOnly() { this.VerifyAPIReadOnly(); }
void IVisual3DContainer.VerifyAPIReadOnly(DependencyObject other) { this.VerifyAPIReadOnly(other); }
void IVisual3DContainer.VerifyAPIReadWrite() { this.VerifyAPIReadWrite(); }
void IVisual3DContainer.VerifyAPIReadWrite(DependencyObject other) { this.VerifyAPIReadWrite(other); }
///
/// Applies various API checks
///
internal void VerifyAPIReadOnly()
{
// Verify that we are executing on the right context
VerifyAccess();
}
///
/// Applies various API checks
///
internal void VerifyAPIReadOnly(DependencyObject other)
{
VerifyAPIReadOnly();
if (other != null)
{
// Make sure the visual is on the same context as we are
MediaSystem.AssertSameContext(this, other);
}
}
///
/// Applies various API checks for read/write
///
internal void VerifyAPIReadWrite()
{
VerifyAPIReadOnly();
// Verify the correct access permissions
MediaContext.From(this.Dispatcher).VerifyWriteAccess();
}
///
/// Applies various API checks
///
internal void VerifyAPIReadWrite(DependencyObject other)
{
VerifyAPIReadWrite();
if (other != null)
{
// Make sure the visual is on the same context as we are
MediaSystem.AssertSameContext(this, other);
}
}
internal void SetParent(Visual newParent)
{
_2DParent.SetValue(this, newParent);
_3DParent = null;
Debug.Assert(InternalVisualParent == newParent);
}
internal void SetParent(Visual3D newParent)
{
_2DParent.ClearValue(this);
_3DParent = newParent;
Debug.Assert(InternalVisualParent == newParent);
}
///
/// Derived classes override this property to enable the Visual code to enumerate
/// the Visual children. Derived classes need to return the number of children
/// from this method.
///
/// By default a Visual does not have any children.
///
/// Remark: During this virtual method the Visual tree must not be modified.
///
protected virtual int Visual3DChildrenCount
{
get { return 0; }
}
///
/// Derived class must implement to support Visual children. The method must return
/// the child at the specified index. Index must be between 0 and GetVisualChildrenCount-1.
///
/// By default a Visual does not have any children.
///
/// Remark:
/// Need to lock down Visual tree during the callbacks.
/// During this virtual call it is not valid to modify the Visual tree.
///
/// It is okay to type this protected API to the 2D Visual. The only 2D Visual with
/// 3D childern is the Viewport3DVisual which is sealed. -- [....] 01/17/06
///
protected virtual Visual3D GetVisual3DChild(int index)
{
throw new ArgumentOutOfRangeException("index", index, SR.Get(SRID.Visual_ArgumentOutOfRange));
}
///
/// Notifies the element that you have added a child. The Element
/// will update the parent pointer, fire the correct events, etc.
///
void IVisual3DContainer.AddChild(Visual3D child)
{
AddVisual3DChild(child);
}
///
/// Notifies the element that you have removed a child. The Element
/// will update the parent pointer, fire the correct events, etc.
///
void IVisual3DContainer.RemoveChild(Visual3D child)
{
RemoveVisual3DChild(child);
}
///
/// Gets the number of Visual3D children that the IVisual3DContainer
/// contains.
///
int IVisual3DContainer.GetChildrenCount()
{
return Visual3DChildrenCount;
}
///
/// Gets the index children of the IVisual3DContainer
///
Visual3D IVisual3DContainer.GetChild(int index)
{
return GetVisual3DChild(index);
}
//------------------------------------------------------
//
// DEBUG
//
//-----------------------------------------------------
#region DEBUG
[Conditional("DEBUG")]
internal void Debug_VerifyBoundsEqual(Rect3D bounds1, Rect3D bounds2, string errorString)
{
// The funny boolean logic below avoids asserts when the cached
// bounds contain NaNs. (NaN != NaN)
bool boundsAreEqual =
!(bounds1.X < bounds2.X || bounds1.X > bounds2.X) &&
!(bounds1.Y < bounds2.Y || bounds1.Y > bounds2.Y) &&
!(bounds1.Z < bounds2.Z || bounds1.Z > bounds2.Z) &&
!(bounds1.SizeX < bounds2.SizeX || bounds1.SizeX > bounds2.SizeX) &&
!(bounds1.SizeY < bounds2.SizeY || bounds1.SizeY > bounds2.SizeY) &&
!(bounds1.SizeZ < bounds2.SizeZ || bounds1.SizeZ > bounds2.SizeZ);
Debug.Assert(boundsAreEqual, errorString);
}
[Conditional("DEBUG")]
internal void Debug_VerifyCachedSubgraphBounds()
{
Rect3D currentBounds = Rect3D.Empty;
#if DEBUG
currentBounds = Debug_CalculateSubgraphBounds();
#endif
// currentBounds includes Transform so we need to
// temporarily transform _bboxSubgraph
Rect3D cachedBounds = M3DUtil.ComputeTransformedAxisAlignedBoundingBox(ref _bboxSubgraph, Transform);
Debug_VerifyBoundsEqual(cachedBounds, currentBounds, "Cached bbox subgraph is incorrect!");
}
[Conditional("DEBUG")]
internal void Debug_VerifyCachedContentBounds()
{
Model3D model = _visual3DModel;
Debug.Assert(model != null);
Debug_VerifyBoundsEqual(model.CalculateSubgraphBoundsOuterSpace(),
_bboxContent, "Cached content bounds is incorrect!");
}
// [Conditional] does not work on methods that return values
#if DEBUG
internal Rect3D Debug_CalculateSubgraphBounds()
{
Rect3D currentSubgraphBounds = GetContentBounds();
for (int i = 0, count = Visual3DChildrenCount; i < count; i++)
{
currentSubgraphBounds.Union(
GetVisual3DChild(i).Debug_CalculateSubgraphBounds()
);
}
return M3DUtil.ComputeTransformedAxisAlignedBoundingBox(ref currentSubgraphBounds, Transform);
}
#endif
#endregion DEBUG
///
/// Precompute pass.
///
internal void PrecomputeRecursive(out Rect3D bboxSubgraph)
{
if (CheckFlagsAnd(VisualFlags.IsSubtreeDirtyForPrecompute))
{
//
// Track which subtrees have nodes that use realization caches.
//
bool subTreeUsesRealizationCaches = false;
subTreeUsesRealizationCaches |= PrecomputeContent();
//
// Update the subgraph bounding box which includes the content bounds
// and the bounds of our children.
//
_bboxSubgraph = GetContentBounds();
for (int i = 0, count = Visual3DChildrenCount; i < count; i++)
{
Visual3D child = GetVisual3DChild(i);
Rect3D bboxSubgraphChild;
child.PrecomputeRecursive(out bboxSubgraphChild);
_bboxSubgraph.Union(bboxSubgraphChild);
subTreeUsesRealizationCaches |=
child.CheckFlagsAnd(VisualFlags.NodeInSubtreeUsesRealizationCaches);
}
//
// Update the NodeInSubtreeUsesRealizationCaches bit.
//
subTreeUsesRealizationCaches |= CheckFlagsAnd(VisualFlags.NodeUsesRealizationCaches);
SetFlags(subTreeUsesRealizationCaches, VisualFlags.NodeInSubtreeUsesRealizationCaches);
SetFlags(false, VisualFlags.IsSubtreeDirtyForPrecompute);
}
bboxSubgraph = M3DUtil.ComputeTransformedAxisAlignedBoundingBox(ref _bboxSubgraph, Transform);
}
internal void RenderRecursive(RenderContext ctx)
{
DUCE.Channel channel = ctx.Channel;
DUCE.ResourceHandle handle = DUCE.ResourceHandle.Null;
VisualProxyFlags flags = c_Model3DVisualProxyFlagsDirtyMask;
//
// Ensure that the resource for this Visual is sent to our current channel.
//
bool isOnChannel = IsOnChannel(channel);
if (isOnChannel)
{
//
// Good, we're already on channel. Get the handle and the flags.
//
handle = _proxy.GetHandle(channel);
flags = _proxy.GetFlags(channel);
}
else
{
//
// Create the visual resource on the current channel.
//
// Note: we need to update all set properties (the dirty
// bit mask is set by default).
//
handle = ((DUCE.IResource)this).AddRefOnChannel(channel);
}
//
// Hookup content to the Visual
//
if ((flags & VisualProxyFlags.IsContentDirty) != 0)
{
RenderContent(ctx, isOnChannel);
}
//
// Update the transform.
//
if ((flags & VisualProxyFlags.IsTransformDirty) != 0)
{
Transform3D transform = Transform;
if (transform != null && InternalIsVisible)
{
//
// Set the new transform resource for this visual. If transform is
// null we don't need to do this. Also note that the old transform
// was disconnected in the Transform property setter.
//
DUCE.Visual3DNode.SetTransform(
handle,
((DUCE.IResource)transform).AddRefOnChannel(channel),
channel);
}
else if (!InternalIsVisible)
{
DUCE.Visual3DNode.SetTransform(
handle,
((DUCE.IResource)_zeroScale).AddRefOnChannel(channel),
channel);
}
else if (!isOnChannel) /* Transform == null */
{
DUCE.Visual3DNode.SetTransform(
handle,
DUCE.ResourceHandle.Null,
channel);
}
}
// Visit children of this node -----------------------------------------------------------------------
Debug.Assert((flags & VisualProxyFlags.IsContentNodeConnected) == 0,
"Only HostVisuals are expected to have a content node.");
for (int i = 0; i < Visual3DChildrenCount; i++)
{
Visual3D child = GetVisual3DChild(i);
if (child != null)
{
if (child.CheckFlagsAnd(channel, VisualProxyFlags.IsSubtreeDirtyForRender) || // or the visual is dirty
!(child.IsOnChannel(channel))) // or the child has not been marshalled yet.
{
child.RenderRecursive(ctx);
}
if (child.IsOnChannel(ctx.Channel))
{
if (!child.CheckFlagsAnd(channel, VisualProxyFlags.IsConnectedToParent))
{
DUCE.Visual3DNode.InsertChildAt(
handle,
((DUCE.IResource)child).GetHandle(channel),
/* iPosition = */ (uint)i,
ctx.Channel);
child.SetFlags(channel, true, VisualProxyFlags.IsConnectedToParent);
}
}
}
}
//
// Finally, reset the dirty flags for this visual (at this point,
// we have handled them all).
//
SetFlags(channel, false, c_Model3DVisualProxyFlagsDirtyMask);
}
///
/// RenderContent is implemented to hook up the Visual3Ds content.
/// The implementer of this function can assert that the _hCompNode
/// is valid on a channel when the function is executed.
///
internal void RenderContent(RenderContext ctx, bool isOnChannel)
{
DUCE.Channel channel = ctx.Channel;
Debug.Assert(!CheckFlagsAnd(channel, VisualProxyFlags.IsContentConnected));
Debug.Assert(IsOnChannel(channel));
//
// Create the content on the channel.
//
if (_visual3DModel != null)
{
//
// Attach the content to the visual resource
//
DUCE.Visual3DNode.SetContent(
((DUCE.IResource)this).GetHandle(channel),
((DUCE.IResource)_visual3DModel).AddRefOnChannel(channel),
channel);
SetFlags(channel, true, VisualProxyFlags.IsContentConnected);
}
else if (isOnChannel) /* Model == null */
{
DUCE.Visual3DNode.SetContent(
((DUCE.IResource)this).GetHandle(channel),
DUCE.ResourceHandle.Null,
channel);
}
}
///
/// Returns true if the specified ancestor is really the ancestor of the
/// given descendant.
///
public bool IsAncestorOf(DependencyObject descendant)
{
Visual visual;
Visual3D visual3D;
VisualTreeUtils.AsNonNullVisual(descendant, out visual, out visual3D);
// x86 branch prediction skips the branch on first encounter. We favor 3D.
if(visual != null)
{
return visual.IsDescendantOf(this);
}
return visual3D.IsDescendantOf(this);
}
///
/// Returns true if the refernece Visual (this) is a descendant of the argument Visual.
///
public bool IsDescendantOf(DependencyObject ancestor)
{
if (ancestor == null)
{
throw new ArgumentNullException("ancestor");
}
VisualTreeUtils.EnsureVisual(ancestor);
// Walk up the parent chain of the descendant untill we run out
// of 3D parents or we find the ancestor.
Visual3D current = this;
while (current != null && current != ancestor)
{
// If our 3D parent is null then continue walk in 2D
if (current._3DParent == null)
{
DependencyObject parent2D = current.InternalVisualParent;
if (parent2D != null)
{
// The type has to be Visual because of the above if condition
return ((Visual)parent2D).IsDescendantOf(ancestor);
}
}
current = current._3DParent;
}
return current == ancestor;
}
///
/// Walks up the Visual tree setting or clearing the given flags. Unlike
/// PropagateFlags this does not terminate when it reaches node with
/// the flags already set. It always walks all the way to the root.
///
internal void SetFlagsToRoot(bool value, VisualFlags flag)
{
Visual3D current = this;
do
{
current.SetFlags(value, flag);
if (current._3DParent == null)
{
VisualTreeUtils.SetFlagsToRoot(InternalVisualParent, value, flag);
return;
}
current = current._3DParent;
}
while (current != null);
}
///
/// Finds the first ancestor of the given element which has the given
/// flags set.
///
internal DependencyObject FindFirstAncestorWithFlagsAnd(VisualFlags flag)
{
Visual3D current = this;
do
{
if (current.CheckFlagsAnd(flag))
{
// The other Visual crossed through this Visual's parent chain. Hence this is our
// common ancestor.
return current;
}
if (current._3DParent == null)
{
return VisualTreeUtils.FindFirstAncestorWithFlagsAnd(InternalVisualParent, flag);
}
current = current._3DParent;
}
while (current != null);
return null;
}
///
/// Finds the common ancestor of two Visuals.
///
/// Returns the common ancestor if the Visuals have one or otherwise null.
/// If the argument is null.
public DependencyObject FindCommonVisualAncestor(DependencyObject otherVisual)
{
VerifyAPIReadOnly(otherVisual);
if (otherVisual == null)
{
throw new System.ArgumentNullException("otherVisual");
}
// Since we can't rely on code running in the CLR, we need to first make sure
// that the FindCommonAncestor flag is not set. It is enought to ensure this
// on one path to the root Visual.
//
SetFlagsToRoot(false, VisualFlags.FindCommonAncestor);
// Walk up the other visual's parent chain and set the FindCommonAncestor flag.
VisualTreeUtils.SetFlagsToRoot(otherVisual, true, VisualFlags.FindCommonAncestor);
// Now see if the other Visual's parent chain crosses our parent chain.
return FindFirstAncestorWithFlagsAnd(VisualFlags.FindCommonAncestor);
}
///
/// Override this function in derived classes to release unmanaged resources during Dispose
/// and during removal of a subtree.
///
internal void FreeDUCEResources(DUCE.Channel channel)
{
Transform3D transform = Transform;
if (!CheckFlagsAnd(channel, VisualProxyFlags.IsTransformDirty))
{
if (InternalIsVisible)
{
if (transform != null)
{
((DUCE.IResource)transform).ReleaseOnChannel(channel);
}
}
else
{
((DUCE.IResource)_zeroScale).ReleaseOnChannel(channel);
}
}
Model3D model = _visual3DModel;
if ((model != null) && (!CheckFlagsAnd(channel, VisualProxyFlags.IsContentDirty)))
{
((DUCE.IResource)model).ReleaseOnChannel(channel);
}
Debug.Assert(IsOnChannel(channel));
Debug.Assert(!CheckFlagsAnd(channel, VisualProxyFlags.IsContentNodeConnected));
_proxy.ReleaseOnChannel(channel);
}
void DUCE.IResource.ReleaseOnChannel(DUCE.Channel channel)
{
ReleaseOnChannelCore(channel);
}
internal void ReleaseOnChannelCore(DUCE.Channel channel)
{
if (!IsOnChannel(channel))
{
return;
}
// at this point the tree is not connected any more.
SetFlags(channel, false, VisualProxyFlags.IsConnectedToParent);
FreeDUCEResources(channel);
for (int i = 0; i < Visual3DChildrenCount; i++)
{
Visual3D child = GetVisual3DChild(i);
((DUCE.IResource)child).ReleaseOnChannel(channel);
}
}
///
/// Disconnects a resource attached to this visual.
///
internal void DisconnectAttachedResource(
VisualProxyFlags correspondingFlag,
DUCE.IResource attachedResource)
{
//
// Iterate over the channels this visual is being marshaled to
//
for (int i = 0; i < _proxy.Count; i++)
{
VisualProxyFlags flags = _proxy.GetFlags(i);
if ((flags & correspondingFlag) == 0)
{
DUCE.Channel channel = _proxy.GetChannel(i);
//
// Set the flag so that during render we send
// update to the compositor.
//
SetFlags(channel, true, correspondingFlag);
if (correspondingFlag == VisualProxyFlags.IsContentDirty)
{
_proxy.SetFlags(i, false, VisualProxyFlags.IsContentConnected);
}
//
// Add this resource to the queue for delayed-removal.
//
channel.AddToRemoveAndReleaseQueue(
null,
attachedResource);
}
}
}
internal void UpdateRealizations(RealizationContext rc)
{
Debug.Assert(CheckFlagsAnd(VisualFlags.NodeInSubtreeUsesRealizationCaches));
Matrix3DStack stack3D = rc.Transform3DStack;
Transform3D transform = Transform;
if (transform != null)
{
stack3D.Push(transform.Value);
}
Model3D model = _visual3DModel;
// It's possible that NodeInSubtreeUsesRealizationCaches is 'true' for
// one of the children but not the Model so we still check the ProtectedContent
if (model != null && model._flags[Model3D.RequiresRealizationFlag])
{
model.MarkVisibleRealizations(rc);
}
// should this know about children?
for (int i = 0; i < Visual3DChildrenCount; i++)
{
Visual3D child = GetVisual3DChild(i);
if (child.CheckFlagsAnd(VisualFlags.NodeInSubtreeUsesRealizationCaches))
{
child.UpdateRealizations(rc);
}
}
if (transform != null)
{
stack3D.Pop();
}
}
// Normally the inheritence context is the same as our parent. When it differs,
// we store the value in the _inheritanceContext UncommonField. See comments
// on the _inheritanceContext and UseParentAsContext members for more info.
internal override DependencyObject InheritanceContext
{
get
{
DependencyObject value = _inheritanceContext.GetValue(this);
if (value == UseParentAsContext)
{
return InternalVisualParent;
}
return value;
}
}
internal override void AddInheritanceContext(DependencyObject context, DependencyProperty property)
{
base.AddInheritanceContext(context, property);
// Call local helper
AddOrRemoveInheritanceContext(context);
}
internal override void RemoveInheritanceContext(DependencyObject context, DependencyProperty property)
{
base.RemoveInheritanceContext(context, property);
// Call local helper
AddOrRemoveInheritanceContext(null);
}
// Local helping for adding or removing an inheritance context
private void AddOrRemoveInheritanceContext(DependencyObject newInheritanceContext)
{
// If we are using our parent as our inheritance context the InheritanceContext
// property will already be returning the new context, but we still need to treat
// this as a change so we notify our dependants.
bool contextChanged =
InheritanceContext != newInheritanceContext ||
(_inheritanceContext.GetValue(this) == UseParentAsContext &&
newInheritanceContext == InternalVisualParent);
if (contextChanged)
{
// Pick up the new context
SetInheritanceContext(newInheritanceContext);
OnInheritanceContextChanged(EventArgs.Empty);
}
}
internal override bool HasMultipleInheritanceContexts
{
get { return base.HasMultipleInheritanceContexts; }
}
internal override void OnInheritanceContextChangedCore(EventArgs args) // ancestor changed
{
base.OnInheritanceContextChangedCore(args);
for (int i = 0; i < Visual3DChildrenCount; i++)
{
DependencyObject child = GetVisual3DChild(i);
Debug.Assert(child.InheritanceContext == this,
"How did a child get inserted without propagating our inheritance context?");
child.OnInheritanceContextChanged(args);
}
}
#endregion Internal Methods
// -------------------------------------------------------------------
//
// Visual-to-Visual Transforms
//
// --------------------------------------------------------------------
#region Visual-to-Visual Transforms
///
/// Returns a transform that can be used to transform coordinates from this
/// node to the specified ancestor, or null if the transformation cannot be created.
/// 2D is allowed to be between the 3D nodes.
///
///
/// If ancestor is null.
///
///
/// If the ancestor Visual3D is not a ancestor of Visual3D.
///
/// If the Visual3Ds are not connected.
public GeneralTransform3D TransformToAncestor(Visual3D ancestor)
{
if (ancestor == null)
{
throw new ArgumentNullException("ancestor");
}
VerifyAPIReadOnly(ancestor);
return InternalTransformToAncestor(ancestor, false);
}
///
/// Returns a transform that can be used to transform coordinates from this
/// node to the specified descendant, or null if the transform from descendant to "this"
/// is non-invertible. This is the case when 2D is between the nodes.
///
///
///
/// If the reference Visual3D is not a ancestor of the descendant Visual3D.
///
/// If the descendant argument is null.
/// If the Visual3Ds are not connected.
public GeneralTransform3D TransformToDescendant(Visual3D descendant)
{
if (descendant == null)
{
throw new ArgumentNullException("descendant");
}
VerifyAPIReadOnly(descendant);
return descendant.InternalTransformToAncestor(this, true);
}
///
/// Returns the transform or the inverse transform between this visual and the specified ancestor.
/// If inverse is requested but does not exist (if the transform is not invertible), null is returned.
///
/// Ancestor visual.
/// Returns inverse if this argument is true.
private GeneralTransform3D InternalTransformToAncestor(Visual3D ancestor, bool inverse)
{
Debug.Assert(ancestor != null);
// used to track if all the collected transforms on the way to the ancestor were valid
bool success = true;
DependencyObject g = this;
Visual3D lastVisual3D = null;
Matrix3D m = Matrix3D.Identity;
GeneralTransform3DGroup group = null;
// This while loop will walk up the visual tree until we encounter the ancestor.
// As it does so, it will accumulate the descendent->ancestor transform.
// In most cases, this is simply a matrix, though if we encounter a 2D node we need to
// transform from 3D out in to 2D and then back in to 3D and continue the parent walk.
// We will accumulate the current transform in a matrix until we encounter a 2D parent,
// at which point we will add the matrix's current value and the transform from 3D to 2D to 3D
// to the GeneralTransform3DGroup and continue to accumulate further transforms in the matrix again.
// At the end of this loop, we will have 0 or more transforms in the GeneralTransform3DGroup
// and the matrix which, if not identity, should be appended to the GeneralTransform3DGroup.
// If, as is commonly the case, this loop terminates without encountering a 2D parent
// we will simply use the Matrix3D.
while ((VisualTreeHelper.GetParent(g) != null) && (g != ancestor))
{
Visual3D gAsVisual3D = g as Visual3D;
if (gAsVisual3D != null)
{
Transform3D transform = gAsVisual3D.Transform;
if (transform != null)
{
transform.Append(ref m);
}
lastVisual3D = gAsVisual3D;
g = VisualTreeHelper.GetParent(gAsVisual3D);
}
else
{
if (group == null)
{
group = new GeneralTransform3DGroup();
}
group.Children.Add(new MatrixTransform3D(m));
m = Matrix3D.Identity;
// construct the 3D to 2D to 3D transform
Visual gAsVisual = g as Visual;
GeneralTransform3DTo2D transform3DTo2D = lastVisual3D.TransformToAncestor(gAsVisual);
// now find the 3D parent of the 2D object
Visual3D containing3DParent = VisualTreeHelper.GetContainingVisual3D(gAsVisual);
// if containing3DParent is null, then the ancestor parameter is not really an ancestor
// break out of the loop to allow it to fail
if (containing3DParent == null)
{
break;
}
GeneralTransform2DTo3D transform2DTo3D = gAsVisual.TransformToAncestor(containing3DParent);
// if either transform ends up being null then we don't have a transform
if (transform3DTo2D == null || transform2DTo3D == null)
{
// we don't want to break here because although we own't be able to create a valid transformation
// we also want to throw an exception if the ancestor passed in is not a valid ancestor. We then
// continue the tree walk to make sure.
success = false;
}
else
{
group.Children.Add(new GeneralTransform3DTo2DTo3D(transform3DTo2D, transform2DTo3D));
}
// the last visual3D found is where we continue the search
g = containing3DParent;
}
}
if (g != ancestor)
{
throw new System.InvalidOperationException(SR.Get(inverse ? SRID.Visual_NotADescendant : SRID.Visual_NotAnAncestor));
}
// construct the generaltransform3d to return and invert it if necessary
GeneralTransform3D finalTransform = null;
// if we successfully found a transform then we can create it here, otherwise finalTransform stays null
if (success)
{
if (group != null)
{
finalTransform = group;
}
else
{
finalTransform = new MatrixTransform3D(m);
}
if (inverse)
{
finalTransform = finalTransform.Inverse;
}
}
if (finalTransform != null)
{
finalTransform.Freeze();
}
return finalTransform;
}
///
/// Returns a transform that can be used to transform coordinate from this
/// node to the specified ancestor, or null if the transform does not exist.
/// This transform will take a 3D point, and then project it in to 2D space.
/// The resulting point is the transformed 3D point in the coordinate space
/// of the given ancestor.
///
///
///
/// If ancestor is null.
///
///
/// If the ancestor Visual is not an ancestor of this.
///
/// If the Visual3D and Visual are not connected.
public GeneralTransform3DTo2D TransformToAncestor(Visual ancestor)
{
if (ancestor == null)
{
throw new ArgumentNullException("ancestor");
}
VerifyAPIReadOnly(ancestor);
return InternalTransformToAncestor(ancestor);
}
///
/// Provides the transform between this visual3D and the specified ancestor, or null
/// if the transform does not exist.
///
///
/// Ancestor visual.
/// The transform from 3D to 2D
internal GeneralTransform3DTo2D InternalTransformToAncestor(Visual ancestor)
{
Debug.Assert(ancestor != null);
// get the transform out of 3D and in to 2D
Viewport3DVisual containingViewport;
Matrix3D projectionTransform;
if (!M3DUtil.TryTransformToViewport3DVisual(this, out containingViewport, out projectionTransform))
{
return null;
}
// get the transform from the Viewport3DVisual to the ancestor
GeneralTransform transformIn2D = containingViewport.TransformToAncestor(ancestor);
// package the two up in the transformTo2D
GeneralTransform3DTo2D result = new GeneralTransform3DTo2D(projectionTransform, transformIn2D);
result.Freeze();
return result;
}
#endregion Visual-to-Visual Transforms
//-----------------------------------------------------
//
// Internal Properties
//
//------------------------------------------------------
#region Internal Properties
internal DependencyObject InternalVisualParent
{
get
{
if (_3DParent != null)
{
Debug.Assert(_2DParent.GetValue(this) == null,
"Only one parent pointer should be set at a time.");
return _3DParent;
}
DependencyObject parent2D = _2DParent.GetValue(this);
Debug.Assert(parent2D == null || parent2D is Viewport3DVisual,
"The only acceptable 2D parent for a Visual3D is a Viewport3DVisual.");
return parent2D;
}
}
internal int ParentIndex
{
get { return _parentIndex; }
set { _parentIndex = value; }
}
// Are we in the process of iterating the visual children.
// This flag is set during a descendents walk, for property invalidation.
internal bool IsVisualChildrenIterationInProgress
{
[FriendAccessAllowed]
get { return CheckFlagsAnd(VisualFlags.IsVisualChildrenIterationInProgress); }
[FriendAccessAllowed]
set { SetFlags(value, VisualFlags.IsVisualChildrenIterationInProgress); }
}
#endregion Internal Properties
// --------------------------------------------------------------------
//
// Visual flags manipulation
//
// -------------------------------------------------------------------
#region Visual flags manipulation
///
/// SetFlagsOnAllChannels is used to set or unset one
/// or multiple flags on all channels this visual is
/// marshaled to.
///
internal void SetFlagsOnAllChannels(
bool value,
VisualProxyFlags flagsToChange)
{
_proxy.SetFlagsOnAllChannels(
value,
flagsToChange);
}
///
/// SetFlags is used to set or unset one or multiple flags on a given channel.
///
internal void SetFlags(
DUCE.Channel channel,
bool value,
VisualProxyFlags flagsToChange)
{
_proxy.SetFlags(
channel,
value,
flagsToChange);
}
///
/// SetFlags is used to set or unset one or multiple node flags on the node.
///
internal void SetFlags(bool value, VisualFlags Flags)
{
_flags = value ? (_flags | Flags) : (_flags & (~Flags));
}
///
/// CheckFlagsOnAllChannels returns true if all flags in
/// the bitmask flags are set on all channels this visual is
/// marshaled to.
///
///
/// If there aren't any bits set on the specified flags
/// the method returns true.
///
internal bool CheckFlagsOnAllChannels(VisualProxyFlags flagsToCheck)
{
return _proxy.CheckFlagsOnAllChannels(flagsToCheck);
}
///
/// CheckFlagsAnd returns true if all flags in the bitmask flags
/// are set on a given channel.
///
///
/// If there aren't any bits set on the specified flags
/// the method returns true.
///
internal bool CheckFlagsAnd(
DUCE.Channel channel,
VisualProxyFlags flagsToCheck)
{
return (_proxy.GetFlags(channel) & flagsToCheck) == flagsToCheck;
}
///
/// CheckFlagsAnd returns true if all flags in the bitmask flags are set on the node.
///
/// If there aren't any bits set on the specified flags the method
/// returns true
internal bool CheckFlagsAnd(VisualFlags flags)
{
return (_flags & flags) == flags;
}
///
/// Returns the child at index "index" (in most cases this will be
/// a Visual, but it some cases, Viewport3DVisual for instance,
/// this is a Visual3D).
///
/// Used only by VisualTreeHelper.
///
internal virtual DependencyObject InternalGet2DOr3DVisualChild(int index)
{
// Call the right virtual method.
return GetVisual3DChild(index);
}
///
/// Returns the number of children of this object (in most cases this will be
/// the number of Visuals, but it some cases, Viewport3DVisual for instance,
/// this is the number of Visual3Ds).
///
/// Used only by VisualTreeHelper.
///
internal virtual int InternalVisual2DOr3DChildrenCount
{
get
{
// Call the right virtual method.
return Visual3DChildrenCount;
}
}
///
/// Checks if any of the specified flags is set on a given channel.
///
///
/// If there aren't any bits set on the specified flags
/// the method returns true.
///
internal bool CheckFlagsOr(
DUCE.Channel channel,
VisualProxyFlags flagsToCheck)
{
return (_proxy.GetFlags(channel) & flagsToCheck) != VisualProxyFlags.None;
}
///
/// Checks if any of the specified flags is set on the node.
///
/// If there aren't any bits set on the specified flags the method
/// returns true
internal bool CheckFlagsOr(VisualFlags flags)
{
return (flags == 0) || ((_flags & flags) > 0);
}
///
/// Check all the children for a bit.
///
internal static bool DoAnyChildrenHaveABitSet(Visual3D pe,
VisualFlags flag)
{
int count = pe.InternalVisual2DOr3DChildrenCount;
for (int i = 0; i < count; i++)
{
DependencyObject child = pe.InternalGet2DOr3DVisualChild(i);
Visual v = null;
Visual3D v3D = null;
VisualTreeUtils.AsNonNullVisual(child, out v, out v3D);
if (v != null && v.CheckFlagsAnd(flag))
{
return true;
}
else if (v3D != null && v3D.CheckFlagsAnd(flag))
{
return true;
}
}
return false;
}
///
/// Propagates the flags up to the root.
///
///
/// The walk stops on a node with all of the required flags set.
///
internal static void PropagateFlags(
Visual3D e,
VisualFlags flags,
VisualProxyFlags proxyFlags)
{
while ((e != null) &&
(!e.CheckFlagsAnd(flags) || !e.CheckFlagsOnAllChannels(proxyFlags)))
{
// These asserts are mostly for documentation when diffing the 2D/3D
// implementations.
Debug.Assert(!e.CheckFlagsOr(VisualFlags.ShouldPostRender),
"Visual3Ds should never be the root of a tree.");
Debug.Assert(!e.CheckFlagsOr(VisualFlags.NodeIsVisualBrushRoot),
"Visual3Ds should never be the root of a VisualBrush.");
e.SetFlags(true, flags);
e.SetFlagsOnAllChannels(true, proxyFlags);
// If our 3D parent is null call back into VisualTreeUtils to potentially
// continue the walk in 2D.
if (e._3DParent == null)
{
Viewport3DVisual viewport = e.InternalVisualParent as Viewport3DVisual;
Debug.Assert((viewport == null) == (e.InternalVisualParent == null),
"Viewport3DVisual is the only supported 2D parent of a 3D visual.");
if(viewport != null)
{
// We must notify the 2D visual that its contents have changed.
// This will cause the 2D visual to set it's content dirty flag
// and continue the propagation of IsDirtyForRender/Precompute.
viewport.Visual3DTreeChanged();
// continue propagating flags up the 2D world
Visual.PropagateFlags(viewport, flags, proxyFlags);
}
// Stop propagating. We are at the root of the 3D subtree.
return;
}
e = e._3DParent;
}
}
#endregion Visual flags manipulation
//------------------------------------------------------
//
// Private Methods
//
//-----------------------------------------------------
#region Private Methods
private void SetInheritanceContext(DependencyObject newInheritanceContext)
{
if (newInheritanceContext == InternalVisualParent)
{
_inheritanceContext.ClearValue(this);
Debug.Assert(_inheritanceContext.GetValue(this) == UseParentAsContext,
"Clearing the _inheritanceContext uncommon field should put us in the UseParentAsContext state.");
}
else
{
_inheritanceContext.SetValue(this, newInheritanceContext);
}
}
#endregion Private Methods
//-----------------------------------------------------
//
// Internal Fields
//
//-----------------------------------------------------
#region Internal Fields
internal VisualProxy _proxy;
#endregion Internal Fields
//------------------------------------------------------
//
// Private Fields
//
//-----------------------------------------------------
#region Private Fields
// If the parent of the Visual3D is another Visual3D we store the parent in the _3DParent field.
// If the parent is a 2D node (as is the case when this is the root of a Viewport3DVisual) we
// store the parent in an UncommonField. Both fields must be considered when determining
// the parent of this node.
private static readonly UncommonField _2DParent =
new UncommonField(/* defaultValue = */ null);
// Sentinel value we use to differentiate between a null inheritance context stored in the
// _inheritanceContext uncommon field and "empty", meaning use the parent as context.
private static readonly DependencyObject UseParentAsContext = new DependencyObject();
// Normally the inheritance context is the same as the parent, except when we are parent to
// a Viewport3D visual, in which case we use this uncommon field to store are alternate context.
private static readonly UncommonField _inheritanceContext =
new UncommonField(/* defaultValue = */ UseParentAsContext);
private static readonly UncommonField AncestorChangedEventField
= new UncommonField();
private Visual3D _3DParent;
private int _parentIndex = -1;
private VisualFlags _flags;
// Untransformed *cached* content bounds. Do not access it directly -- instead
// use GetContentBounds()
private Rect3D _bboxContent;
// Untransformed *cached* subgraph bounds. Do not access it directly -- instead
// use the BBoxSubgraph property.
private Rect3D _bboxSubgraph = Rect3D.Empty;
private bool _internalIsVisible;
private static readonly ScaleTransform3D _zeroScale = new ScaleTransform3D(0, 0, 0);
private Model3D _visual3DModel;
#endregion Private Fields
//------------------------------------------------------
//
// Protected Fields
//
//------------------------------------------------------
#region Protected Fields
#endregion Protected Fields
}
}
// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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