Code:
/ Net / Net / 3.5.50727.3053 / DEVDIV / depot / DevDiv / releases / Orcas / SP / wpf / src / Core / CSharp / MS / Internal / Media / VisualTreeUtils.cs / 2 / VisualTreeUtils.cs
//----------------------------------------------------------------------------
//
//
// Copyright (c) Microsoft Corporation. All rights reserved.
//
//
// History:
// 6/8/2005 : [....] - Created
//
//---------------------------------------------------------------------------
using MS.Internal;
using System;
using System.Diagnostics;
using System.Windows;
using System.Windows.Media;
using System.Windows.Media.Media3D;
using MS.Internal.PresentationCore;
using SR=MS.Internal.PresentationCore.SR;
using SRID=MS.Internal.PresentationCore.SRID;
namespace MS.Internal.Media
{
///
/// Helper methods for interacting with the 2D/3D Visual tree
///
internal static class VisualTreeUtils
{
//-----------------------------------------------------
//
// Constructors
//
//-----------------------------------------------------
//------------------------------------------------------
//
// Public Methods
//
//-----------------------------------------------------
//------------------------------------------------------
//
// Public Properties
//
//------------------------------------------------------
//-----------------------------------------------------
//
// Public Events
//
//------------------------------------------------------
//-----------------------------------------------------
//
// Internal Methods
//
//-----------------------------------------------------
#region Internal Methods
///
/// This walks up the Visual tree setting the given flags starting at the
/// given element.
///
internal static void PropagateFlags(
DependencyObject element,
VisualFlags flags,
VisualProxyFlags proxyFlags)
{
Visual visual;
Visual3D visual3D;
AsVisualInternal(element, out visual, out visual3D);
if (visual != null)
{
Visual.PropagateFlags(visual, flags, proxyFlags);
}
else
{
Visual3D.PropagateFlags(visual3D, flags, proxyFlags);
}
}
///
/// 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 static void SetFlagsToRoot(DependencyObject element, bool value, VisualFlags flags)
{
Visual visual;
Visual3D visual3D;
AsVisualInternal(element, out visual, out visual3D);
if (visual != null)
{
visual.SetFlagsToRoot(value, flags);
}
else if (visual3D != null)
{
visual3D.SetFlagsToRoot(value, flags);
}
}
///
/// Finds the first ancestor of the given element which has the given
/// flags set.
///
internal static DependencyObject FindFirstAncestorWithFlagsAnd(DependencyObject element, VisualFlags flags)
{
Visual visual;
Visual3D visual3D;
AsVisualInternal(element, out visual, out visual3D);
if (visual != null)
{
return visual.FindFirstAncestorWithFlagsAnd(flags);
}
else if (visual3D != null)
{
return visual3D.FindFirstAncestorWithFlagsAnd(flags);
}
Debug.Assert(element == null);
return null;
}
///
/// Converts the given point or ray hit test result into a PointHitTestResult.
/// In the case of a RayHitTestResult this is done by walking up the
/// transforming the 3D intersection into the coordinate space of the
/// Viewport3DVisual which contains the Visual3D subtree.
///
internal static PointHitTestResult AsNearestPointHitTestResult(HitTestResult result)
{
if (result == null)
{
return null;
}
PointHitTestResult resultAsPointHitTestResult = result as PointHitTestResult;
if (resultAsPointHitTestResult != null)
{
return resultAsPointHitTestResult;
}
RayHitTestResult resultAsRayHitTestResult = result as RayHitTestResult;
if (resultAsRayHitTestResult != null)
{
Visual3D current = (Visual3D) resultAsRayHitTestResult.VisualHit;
Matrix3D worldTransform = Matrix3D.Identity;
while (true)
{
if (current.Transform != null)
{
worldTransform.Append(current.Transform.Value);
}
Visual3D parent3D = current.InternalVisualParent as Visual3D;
if (parent3D == null)
{
break;
}
current = parent3D;
}
Viewport3DVisual viewport = current.InternalVisualParent as Viewport3DVisual;
if (viewport != null)
{
Point4D worldPoint = ((Point4D)resultAsRayHitTestResult.PointHit) * worldTransform;
Point viewportPoint = viewport.WorldToViewport(worldPoint);
return new PointHitTestResult(viewport, viewportPoint);
}
Debug.Fail("How did a ray hit a Visual3D not parented to a Viewport3DVisual?");
return null;
}
Debug.Fail(String.Format("Unhandled HitTestResult type '{0}'", result.GetType().Name));
return null;
}
///
/// Throws if the given element is null or is not a Visual or Visual3D
/// or if the Visual is on the wrong thread.
///
internal static void EnsureNonNullVisual(DependencyObject element)
{
EnsureVisual(element, /* allowNull = */ false);
}
///
/// Throws if the given element is null or is not a Visual or Visual3D
/// or if the Visual is on the wrong thread.
///
internal static void EnsureVisual(DependencyObject element)
{
EnsureVisual(element, /* allowNull = */ true);
}
///
/// Throws if the given element is not a Visual or Visual3D
/// or if the Visual is on the wrong thread.
///
private static void EnsureVisual(DependencyObject element, bool allowNull)
{
if (element == null)
{
if (!allowNull)
{
throw new ArgumentNullException("element");
}
return;
}
//
if (!(element is Visual || element is Visual3D))
{
throw new ArgumentException(SR.Get(SRID.Visual_NotAVisual));
}
element.VerifyAccess();
}
///
/// Throws if the given element is null or not a visual type, otherwise
/// either visual or visual3D will be non-null on exit.
///
internal static void AsNonNullVisual(DependencyObject element, out Visual visual, out Visual3D visual3D)
{
if (element == null)
{
throw new ArgumentNullException("element");
}
AsVisual(element, out visual, out visual3D);
Debug.Assert((visual == null) != (visual3D == null),
"Either visual or visual3D exclusively should be non-null.");
}
///
/// Returns null if the given element is null, otherwise visual or visual3D
/// will be the strong visual type on exit.
///
/// Throws an exception if element is a non-Visual type.
///
internal static void AsVisual(DependencyObject element, out Visual visual, out Visual3D visual3D)
{
bool castSucceeded = AsVisualHelper(element, out visual, out visual3D);
if (element != null)
{
if (!castSucceeded)
{
throw new System.InvalidOperationException(SR.Get(SRID.Visual_NotAVisual, element.GetType()));
}
Debug.Assert(castSucceeded && ((visual == null) != (visual3D == null)),
"Either visual or visual3D exclusively should be non-null.");
element.VerifyAccess();
}
else
{
Debug.Assert(!castSucceeded && visual == null && visual3D == null,
"How did the cast succeed if the element was null going in?");
}
}
///
/// Internal helper to cast to DO to Visual or Visual3D. Asserts
/// that the DO is really a Visual type. Null is allowed. Does not
/// VerifyAccess.
///
/// Caller is responsible for guaranteeing that element is a Visual type.
///
internal static bool AsVisualInternal(DependencyObject element, out Visual visual, out Visual3D visual3D)
{
bool castSucceeded = AsVisualHelper(element, out visual, out visual3D);
if (!(castSucceeded || element == null))
{
Debug.Fail(String.Format(
"'{0}' is not a Visual or Visual3D. Caller is responsible for guaranteeing that element is a Visual type.",
element != null ? element.GetType() : null));
}
return castSucceeded;
}
#endregion Internal Methods
//-----------------------------------------------------
//
// Internal Fields
//
//------------------------------------------------------
#region Internal Fields
public const string BitmapEffectObsoleteMessage =
"Avoid using BitmapEffects as they have very poor performance characteristics. They will be deprecated in a future version. Consider using the UIElement.Effect property and ShaderEffects where appropriate instead.";
#endregion
//-----------------------------------------------------
//
// Private Methods
//
//------------------------------------------------------
#region Private Methods
// Common code for AsVisual and AsVisualInternal -- Don't call this.
private static bool AsVisualHelper(DependencyObject element, out Visual visual, out Visual3D visual3D)
{
Visual elementAsVisual = element as Visual;
if (elementAsVisual != null)
{
visual = elementAsVisual;
visual3D = null;
return true;
}
Visual3D elementAsVisual3D = element as Visual3D;
if (elementAsVisual3D != null)
{
visual = null;
visual3D = elementAsVisual3D;
return true;
}
visual = null;
visual3D = null;
return false;
}
#endregion Private Methods
}
}
// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
//----------------------------------------------------------------------------
//
//
// Copyright (c) Microsoft Corporation. All rights reserved.
//
//
// History:
// 6/8/2005 : [....] - Created
//
//---------------------------------------------------------------------------
using MS.Internal;
using System;
using System.Diagnostics;
using System.Windows;
using System.Windows.Media;
using System.Windows.Media.Media3D;
using MS.Internal.PresentationCore;
using SR=MS.Internal.PresentationCore.SR;
using SRID=MS.Internal.PresentationCore.SRID;
namespace MS.Internal.Media
{
///
/// Helper methods for interacting with the 2D/3D Visual tree
///
internal static class VisualTreeUtils
{
//-----------------------------------------------------
//
// Constructors
//
//-----------------------------------------------------
//------------------------------------------------------
//
// Public Methods
//
//-----------------------------------------------------
//------------------------------------------------------
//
// Public Properties
//
//------------------------------------------------------
//-----------------------------------------------------
//
// Public Events
//
//------------------------------------------------------
//-----------------------------------------------------
//
// Internal Methods
//
//-----------------------------------------------------
#region Internal Methods
///
/// This walks up the Visual tree setting the given flags starting at the
/// given element.
///
internal static void PropagateFlags(
DependencyObject element,
VisualFlags flags,
VisualProxyFlags proxyFlags)
{
Visual visual;
Visual3D visual3D;
AsVisualInternal(element, out visual, out visual3D);
if (visual != null)
{
Visual.PropagateFlags(visual, flags, proxyFlags);
}
else
{
Visual3D.PropagateFlags(visual3D, flags, proxyFlags);
}
}
///
/// 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 static void SetFlagsToRoot(DependencyObject element, bool value, VisualFlags flags)
{
Visual visual;
Visual3D visual3D;
AsVisualInternal(element, out visual, out visual3D);
if (visual != null)
{
visual.SetFlagsToRoot(value, flags);
}
else if (visual3D != null)
{
visual3D.SetFlagsToRoot(value, flags);
}
}
///
/// Finds the first ancestor of the given element which has the given
/// flags set.
///
internal static DependencyObject FindFirstAncestorWithFlagsAnd(DependencyObject element, VisualFlags flags)
{
Visual visual;
Visual3D visual3D;
AsVisualInternal(element, out visual, out visual3D);
if (visual != null)
{
return visual.FindFirstAncestorWithFlagsAnd(flags);
}
else if (visual3D != null)
{
return visual3D.FindFirstAncestorWithFlagsAnd(flags);
}
Debug.Assert(element == null);
return null;
}
///
/// Converts the given point or ray hit test result into a PointHitTestResult.
/// In the case of a RayHitTestResult this is done by walking up the
/// transforming the 3D intersection into the coordinate space of the
/// Viewport3DVisual which contains the Visual3D subtree.
///
internal static PointHitTestResult AsNearestPointHitTestResult(HitTestResult result)
{
if (result == null)
{
return null;
}
PointHitTestResult resultAsPointHitTestResult = result as PointHitTestResult;
if (resultAsPointHitTestResult != null)
{
return resultAsPointHitTestResult;
}
RayHitTestResult resultAsRayHitTestResult = result as RayHitTestResult;
if (resultAsRayHitTestResult != null)
{
Visual3D current = (Visual3D) resultAsRayHitTestResult.VisualHit;
Matrix3D worldTransform = Matrix3D.Identity;
while (true)
{
if (current.Transform != null)
{
worldTransform.Append(current.Transform.Value);
}
Visual3D parent3D = current.InternalVisualParent as Visual3D;
if (parent3D == null)
{
break;
}
current = parent3D;
}
Viewport3DVisual viewport = current.InternalVisualParent as Viewport3DVisual;
if (viewport != null)
{
Point4D worldPoint = ((Point4D)resultAsRayHitTestResult.PointHit) * worldTransform;
Point viewportPoint = viewport.WorldToViewport(worldPoint);
return new PointHitTestResult(viewport, viewportPoint);
}
Debug.Fail("How did a ray hit a Visual3D not parented to a Viewport3DVisual?");
return null;
}
Debug.Fail(String.Format("Unhandled HitTestResult type '{0}'", result.GetType().Name));
return null;
}
///
/// Throws if the given element is null or is not a Visual or Visual3D
/// or if the Visual is on the wrong thread.
///
internal static void EnsureNonNullVisual(DependencyObject element)
{
EnsureVisual(element, /* allowNull = */ false);
}
///
/// Throws if the given element is null or is not a Visual or Visual3D
/// or if the Visual is on the wrong thread.
///
internal static void EnsureVisual(DependencyObject element)
{
EnsureVisual(element, /* allowNull = */ true);
}
///
/// Throws if the given element is not a Visual or Visual3D
/// or if the Visual is on the wrong thread.
///
private static void EnsureVisual(DependencyObject element, bool allowNull)
{
if (element == null)
{
if (!allowNull)
{
throw new ArgumentNullException("element");
}
return;
}
//
if (!(element is Visual || element is Visual3D))
{
throw new ArgumentException(SR.Get(SRID.Visual_NotAVisual));
}
element.VerifyAccess();
}
///
/// Throws if the given element is null or not a visual type, otherwise
/// either visual or visual3D will be non-null on exit.
///
internal static void AsNonNullVisual(DependencyObject element, out Visual visual, out Visual3D visual3D)
{
if (element == null)
{
throw new ArgumentNullException("element");
}
AsVisual(element, out visual, out visual3D);
Debug.Assert((visual == null) != (visual3D == null),
"Either visual or visual3D exclusively should be non-null.");
}
///
/// Returns null if the given element is null, otherwise visual or visual3D
/// will be the strong visual type on exit.
///
/// Throws an exception if element is a non-Visual type.
///
internal static void AsVisual(DependencyObject element, out Visual visual, out Visual3D visual3D)
{
bool castSucceeded = AsVisualHelper(element, out visual, out visual3D);
if (element != null)
{
if (!castSucceeded)
{
throw new System.InvalidOperationException(SR.Get(SRID.Visual_NotAVisual, element.GetType()));
}
Debug.Assert(castSucceeded && ((visual == null) != (visual3D == null)),
"Either visual or visual3D exclusively should be non-null.");
element.VerifyAccess();
}
else
{
Debug.Assert(!castSucceeded && visual == null && visual3D == null,
"How did the cast succeed if the element was null going in?");
}
}
///
/// Internal helper to cast to DO to Visual or Visual3D. Asserts
/// that the DO is really a Visual type. Null is allowed. Does not
/// VerifyAccess.
///
/// Caller is responsible for guaranteeing that element is a Visual type.
///
internal static bool AsVisualInternal(DependencyObject element, out Visual visual, out Visual3D visual3D)
{
bool castSucceeded = AsVisualHelper(element, out visual, out visual3D);
if (!(castSucceeded || element == null))
{
Debug.Fail(String.Format(
"'{0}' is not a Visual or Visual3D. Caller is responsible for guaranteeing that element is a Visual type.",
element != null ? element.GetType() : null));
}
return castSucceeded;
}
#endregion Internal Methods
//-----------------------------------------------------
//
// Internal Fields
//
//------------------------------------------------------
#region Internal Fields
public const string BitmapEffectObsoleteMessage =
"Avoid using BitmapEffects as they have very poor performance characteristics. They will be deprecated in a future version. Consider using the UIElement.Effect property and ShaderEffects where appropriate instead.";
#endregion
//-----------------------------------------------------
//
// Private Methods
//
//------------------------------------------------------
#region Private Methods
// Common code for AsVisual and AsVisualInternal -- Don't call this.
private static bool AsVisualHelper(DependencyObject element, out Visual visual, out Visual3D visual3D)
{
Visual elementAsVisual = element as Visual;
if (elementAsVisual != null)
{
visual = elementAsVisual;
visual3D = null;
return true;
}
Visual3D elementAsVisual3D = element as Visual3D;
if (elementAsVisual3D != null)
{
visual = null;
visual3D = elementAsVisual3D;
return true;
}
visual = null;
visual3D = null;
return false;
}
#endregion Private Methods
}
}
// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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