Code:
/ Net / Net / 3.5.50727.3053 / DEVDIV / depot / DevDiv / releases / Orcas / SP / wpf / src / Core / CSharp / System / Windows / Media / VisualTreeHelper.cs / 3 / VisualTreeHelper.cs
//------------------------------------------------------------------------------
// Microsoft Avalon
// Copyright (c) Microsoft Corporation, 2003
//
// File: VisualTreeHelper
//-----------------------------------------------------------------------------
using System;
using System.Windows.Media;
using System.Windows.Media.Media3D;
using System.Windows.Media.Animation;
using System.Windows.Threading;
using System.Security.Permissions;
using System.Windows.Media.Effects;
using System.Collections;
using System.Diagnostics;
using MS.Internal;
using MS.Internal.Media;
using MS.Internal.PresentationCore;
using SR=MS.Internal.PresentationCore.SR;
using SRID=MS.Internal.PresentationCore.SRID;
namespace System.Windows.Media
{
///
/// The VisualTreeHelper class contains static methods that are useful for performing
/// common tasks with visual tree nodes. Nodes in the visual tree may be Visual or
/// Visual3Ds.
///
/// When possible methods are typed to DependencyObject and may accept or
/// return either type of visual tree node (e.g. GetParent).
///
/// When the result of the operation is specific to 2D or 3D the methods are typed
/// to Visual or Visual3D (e.g., GetDescendantBounds()).
///
public static class VisualTreeHelper
{
private static void CheckVisualReferenceArgument(DependencyObject reference)
{
if (reference == null)
{
throw new ArgumentNullException("reference");
}
}
///
/// Get the number of children of the specified Visual.
///
public static int GetChildrenCount(DependencyObject reference)
{
Visual visual;
Visual3D visual3D;
VisualTreeUtils.AsNonNullVisual(reference, out visual, out visual3D);
// x86 branch prediction skips the branch on first encounter. We favor 2D.
if (visual3D != null)
{
return visual3D.InternalVisual2DOr3DChildrenCount;
}
//
// Even though visual is a 2D visual, it still may have
// 3D children.
//
return visual.InternalVisual2DOr3DChildrenCount;
}
///
/// Returns the child of Visual visual at the specified index.
///
public static DependencyObject GetChild(DependencyObject reference, int childIndex)
{
Visual visual;
Visual3D visual3D;
VisualTreeUtils.AsNonNullVisual(reference, out visual, out visual3D);
// x86 branch prediction skips the branch on first encounter. We favor 2D.
if (visual3D != null)
{
return visual3D.InternalGet2DOr3DVisualChild(childIndex);
}
//
// Even though visual is a 2D visual, it still may have
// 3D children.
//
return visual.InternalGet2DOr3DVisualChild(childIndex);
}
///
/// Visual parent of this Visual.
///
public static DependencyObject GetParent(DependencyObject reference)
{
Visual visual;
Visual3D visual3D;
VisualTreeUtils.AsNonNullVisual(reference, out visual, out visual3D);
// x86 branch prediction skips the branch on first encounter. We favor 2D.
if (visual3D != null)
{
return visual3D.InternalVisualParent;
}
return visual.InternalVisualParent;
}
///
/// Equivalent to GetParent except that it does not VerifyAccess and only asserts
/// in
[FriendAccessAllowed]
internal static DependencyObject GetParentInternal(DependencyObject reference)
{
Visual visual;
Visual3D visual3D;
VisualTreeUtils.AsVisualInternal(reference, out visual, out visual3D);
if (visual != null)
{
return visual.InternalVisualParent;
}
if (visual3D != null)
{
return visual3D.InternalVisualParent;
}
Debug.Assert(reference == null);
return null;
}
///
/// Returns the closest Visual that contains the given DependencyObject
///
internal static Visual GetContainingVisual2D(DependencyObject reference)
{
Visual visual = null;
while (reference != null)
{
visual = reference as Visual;
if (visual != null) break;
reference = VisualTreeHelper.GetParent(reference);
}
return visual;
}
///
/// Returns the closest Visual3D that contains the given DependencyObject
///
internal static Visual3D GetContainingVisual3D(DependencyObject reference)
{
Visual3D visual3D = null;
while (reference != null)
{
visual3D = reference as Visual3D;
if (visual3D != null) break;
reference = VisualTreeHelper.GetParent(reference);
}
return visual3D;
}
internal static bool IsAncestorOf(DependencyObject reference, DependencyObject descendant)
{
Visual visual;
Visual3D visual3D;
VisualTreeUtils.AsNonNullVisual(reference, out visual, out visual3D);
// x86 branch prediction skips the branch on first encounter. We favor 2D.
if (visual3D != null)
{
return visual3D.IsAncestorOf(descendant);
}
return visual.IsAncestorOf(descendant);
}
internal static DependencyObject FindCommonAncestor(DependencyObject reference, DependencyObject otherVisual)
{
Visual visual;
Visual3D visual3D;
VisualTreeUtils.AsNonNullVisual(reference, out visual, out visual3D);
// x86 branch prediction skips the branch on first encounter. We favor 2D.
if (visual3D != null)
{
return visual3D.FindCommonVisualAncestor(otherVisual);
}
return visual.FindCommonVisualAncestor(otherVisual);
}
///
/// Gets the clip of this Visual.
///
public static Geometry GetClip(Visual reference)
{
CheckVisualReferenceArgument(reference);
return reference.VisualClip;
}
///
/// Gets the opacity of the Visual.
///
public static double GetOpacity(Visual reference)
{
CheckVisualReferenceArgument(reference);
return reference.VisualOpacity;
}
///
/// Gets the OpacityMask.
///
public static Brush GetOpacityMask(Visual reference)
{
CheckVisualReferenceArgument(reference);
return reference.VisualOpacityMask;
}
///
/// Returns the offset of the Visual.
///
public static Vector GetOffset(Visual reference)
{
CheckVisualReferenceArgument(reference);
return reference.VisualOffset;
}
///
/// Returns the Visual transform.
///
public static Transform GetTransform(Visual reference)
{
CheckVisualReferenceArgument(reference);
return reference.VisualTransform;
}
///
/// Returns X-coordinate (vertical) guideline collection.
///
public static DoubleCollection GetXSnappingGuidelines(Visual reference)
{
CheckVisualReferenceArgument(reference);
return reference.VisualXSnappingGuidelines;
}
///
/// Returns Y-coordinate (horizontal) guideline collection.
///
public static DoubleCollection GetYSnappingGuidelines(Visual reference)
{
CheckVisualReferenceArgument(reference);
return reference.VisualYSnappingGuidelines;
}
///
/// GetDrawing returns the drawing content of the reference Visual
///
public static DrawingGroup GetDrawing(Visual reference)
{
CheckVisualReferenceArgument(reference);
return reference.GetDrawing();
}
///
/// GetContentBounds returns the bounding box for the contents of the specified visual.
///
public static Rect GetContentBounds(Visual reference)
{
CheckVisualReferenceArgument(reference);
return reference.VisualContentBounds;
}
///
/// GetContentBounds returns the bounding box for the contents of the specified visual.
///
public static Rect3D GetContentBounds(Visual3D reference)
{
CheckVisualReferenceArgument(reference);
return reference.VisualContentBounds;
}
///
/// GetDescendantBounds returns the union of all of the content bounding
/// boxes of the specified Visual's sub-graph.
///
public static Rect GetDescendantBounds(Visual reference)
{
CheckVisualReferenceArgument(reference);
return reference.VisualDescendantBounds;
}
///
/// GetDescendantBounds returns the union of all of the content bounding
/// boxes of the specified Visual3D's sub-graph.
///
public static Rect3D GetDescendantBounds(Visual3D reference)
{
CheckVisualReferenceArgument(reference);
return reference.VisualDescendantBounds;
}
///
/// Gets the BitmapEffect.
///
public static BitmapEffect GetBitmapEffect(Visual reference)
{
CheckVisualReferenceArgument(reference);
#pragma warning disable 0618
return reference.VisualBitmapEffect;
#pragma warning restore 0618
}
///
/// Gets the BitmapEffectInput.
///
public static BitmapEffectInput GetBitmapEffectInput(Visual reference)
{
CheckVisualReferenceArgument(reference);
#pragma warning disable 0618
return reference.VisualBitmapEffectInput;
#pragma warning restore 0618
}
///
/// Gets the Effect.
///
public static Effect GetEffect(Visual reference)
{
CheckVisualReferenceArgument(reference);
return reference.VisualEffect;
}
///
/// Gets the EdgeMode of the Visual.
///
public static EdgeMode GetEdgeMode(Visual reference)
{
CheckVisualReferenceArgument(reference);
return reference.VisualEdgeMode;
}
///
/// Return top most visual of a hit test.
///
public static HitTestResult HitTest(Visual reference, Point point)
{
return HitTest(reference, point, true);
}
///
///
[FriendAccessAllowed]
internal static HitTestResult HitTest(Visual reference, Point point, bool include2DOn3D)
{
CheckVisualReferenceArgument(reference);
return reference.HitTest(point, include2DOn3D);
}
///
/// Initiate a hit test using delegates.
///
public static void HitTest(
Visual reference,
HitTestFilterCallback filterCallback,
HitTestResultCallback resultCallback,
HitTestParameters hitTestParameters)
{
CheckVisualReferenceArgument(reference);
reference.HitTest(filterCallback, resultCallback, hitTestParameters);
}
///
/// Initiate a hit test using delegates.
///
public static void HitTest(
Visual3D reference,
HitTestFilterCallback filterCallback,
HitTestResultCallback resultCallback,
HitTestParameters3D hitTestParameters)
{
CheckVisualReferenceArgument(reference);
reference.HitTest(filterCallback, resultCallback, hitTestParameters);
}
#if WCP_MF_ENABLED
///
/// Serialize a visual to fixed (S0) XAML
///
///
///
static internal void SaveAsXml(Visual visual, System.Xml.XmlWriter writer)
{
VisualTreeFlattener.SaveAsXml(visual, writer, new FixedXamlDesigner());
}
///
/// Walk a visual tree and flatten it to (S0) DrawingContext
///
///
///
//CASRemoval:[StrongNameIdentityPermission(SecurityAction.LinkDemand, PublicKey=Microsoft.Internal.BuildInfo.WCP_PUBLIC_KEY_STRING)]
static public void Walk(Visual visual, DrawingContext dc)
{
VisualTreeFlattener flattener = new VisualTreeFlattener(dc);
flattener.Walk(visual, null);
}
#endif // WCP_MF_ENABLED
}
}
// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.
//------------------------------------------------------------------------------
// Microsoft Avalon
// Copyright (c) Microsoft Corporation, 2003
//
// File: VisualTreeHelper
//-----------------------------------------------------------------------------
using System;
using System.Windows.Media;
using System.Windows.Media.Media3D;
using System.Windows.Media.Animation;
using System.Windows.Threading;
using System.Security.Permissions;
using System.Windows.Media.Effects;
using System.Collections;
using System.Diagnostics;
using MS.Internal;
using MS.Internal.Media;
using MS.Internal.PresentationCore;
using SR=MS.Internal.PresentationCore.SR;
using SRID=MS.Internal.PresentationCore.SRID;
namespace System.Windows.Media
{
///
/// The VisualTreeHelper class contains static methods that are useful for performing
/// common tasks with visual tree nodes. Nodes in the visual tree may be Visual or
/// Visual3Ds.
///
/// When possible methods are typed to DependencyObject and may accept or
/// return either type of visual tree node (e.g. GetParent).
///
/// When the result of the operation is specific to 2D or 3D the methods are typed
/// to Visual or Visual3D (e.g., GetDescendantBounds()).
///
public static class VisualTreeHelper
{
private static void CheckVisualReferenceArgument(DependencyObject reference)
{
if (reference == null)
{
throw new ArgumentNullException("reference");
}
}
///
/// Get the number of children of the specified Visual.
///
public static int GetChildrenCount(DependencyObject reference)
{
Visual visual;
Visual3D visual3D;
VisualTreeUtils.AsNonNullVisual(reference, out visual, out visual3D);
// x86 branch prediction skips the branch on first encounter. We favor 2D.
if (visual3D != null)
{
return visual3D.InternalVisual2DOr3DChildrenCount;
}
//
// Even though visual is a 2D visual, it still may have
// 3D children.
//
return visual.InternalVisual2DOr3DChildrenCount;
}
///
/// Returns the child of Visual visual at the specified index.
///
public static DependencyObject GetChild(DependencyObject reference, int childIndex)
{
Visual visual;
Visual3D visual3D;
VisualTreeUtils.AsNonNullVisual(reference, out visual, out visual3D);
// x86 branch prediction skips the branch on first encounter. We favor 2D.
if (visual3D != null)
{
return visual3D.InternalGet2DOr3DVisualChild(childIndex);
}
//
// Even though visual is a 2D visual, it still may have
// 3D children.
//
return visual.InternalGet2DOr3DVisualChild(childIndex);
}
///
/// Visual parent of this Visual.
///
public static DependencyObject GetParent(DependencyObject reference)
{
Visual visual;
Visual3D visual3D;
VisualTreeUtils.AsNonNullVisual(reference, out visual, out visual3D);
// x86 branch prediction skips the branch on first encounter. We favor 2D.
if (visual3D != null)
{
return visual3D.InternalVisualParent;
}
return visual.InternalVisualParent;
}
///
/// Equivalent to GetParent except that it does not VerifyAccess and only asserts
/// in
[FriendAccessAllowed]
internal static DependencyObject GetParentInternal(DependencyObject reference)
{
Visual visual;
Visual3D visual3D;
VisualTreeUtils.AsVisualInternal(reference, out visual, out visual3D);
if (visual != null)
{
return visual.InternalVisualParent;
}
if (visual3D != null)
{
return visual3D.InternalVisualParent;
}
Debug.Assert(reference == null);
return null;
}
///
/// Returns the closest Visual that contains the given DependencyObject
///
internal static Visual GetContainingVisual2D(DependencyObject reference)
{
Visual visual = null;
while (reference != null)
{
visual = reference as Visual;
if (visual != null) break;
reference = VisualTreeHelper.GetParent(reference);
}
return visual;
}
///
/// Returns the closest Visual3D that contains the given DependencyObject
///
internal static Visual3D GetContainingVisual3D(DependencyObject reference)
{
Visual3D visual3D = null;
while (reference != null)
{
visual3D = reference as Visual3D;
if (visual3D != null) break;
reference = VisualTreeHelper.GetParent(reference);
}
return visual3D;
}
internal static bool IsAncestorOf(DependencyObject reference, DependencyObject descendant)
{
Visual visual;
Visual3D visual3D;
VisualTreeUtils.AsNonNullVisual(reference, out visual, out visual3D);
// x86 branch prediction skips the branch on first encounter. We favor 2D.
if (visual3D != null)
{
return visual3D.IsAncestorOf(descendant);
}
return visual.IsAncestorOf(descendant);
}
internal static DependencyObject FindCommonAncestor(DependencyObject reference, DependencyObject otherVisual)
{
Visual visual;
Visual3D visual3D;
VisualTreeUtils.AsNonNullVisual(reference, out visual, out visual3D);
// x86 branch prediction skips the branch on first encounter. We favor 2D.
if (visual3D != null)
{
return visual3D.FindCommonVisualAncestor(otherVisual);
}
return visual.FindCommonVisualAncestor(otherVisual);
}
///
/// Gets the clip of this Visual.
///
public static Geometry GetClip(Visual reference)
{
CheckVisualReferenceArgument(reference);
return reference.VisualClip;
}
///
/// Gets the opacity of the Visual.
///
public static double GetOpacity(Visual reference)
{
CheckVisualReferenceArgument(reference);
return reference.VisualOpacity;
}
///
/// Gets the OpacityMask.
///
public static Brush GetOpacityMask(Visual reference)
{
CheckVisualReferenceArgument(reference);
return reference.VisualOpacityMask;
}
///
/// Returns the offset of the Visual.
///
public static Vector GetOffset(Visual reference)
{
CheckVisualReferenceArgument(reference);
return reference.VisualOffset;
}
///
/// Returns the Visual transform.
///
public static Transform GetTransform(Visual reference)
{
CheckVisualReferenceArgument(reference);
return reference.VisualTransform;
}
///
/// Returns X-coordinate (vertical) guideline collection.
///
public static DoubleCollection GetXSnappingGuidelines(Visual reference)
{
CheckVisualReferenceArgument(reference);
return reference.VisualXSnappingGuidelines;
}
///
/// Returns Y-coordinate (horizontal) guideline collection.
///
public static DoubleCollection GetYSnappingGuidelines(Visual reference)
{
CheckVisualReferenceArgument(reference);
return reference.VisualYSnappingGuidelines;
}
///
/// GetDrawing returns the drawing content of the reference Visual
///
public static DrawingGroup GetDrawing(Visual reference)
{
CheckVisualReferenceArgument(reference);
return reference.GetDrawing();
}
///
/// GetContentBounds returns the bounding box for the contents of the specified visual.
///
public static Rect GetContentBounds(Visual reference)
{
CheckVisualReferenceArgument(reference);
return reference.VisualContentBounds;
}
///
/// GetContentBounds returns the bounding box for the contents of the specified visual.
///
public static Rect3D GetContentBounds(Visual3D reference)
{
CheckVisualReferenceArgument(reference);
return reference.VisualContentBounds;
}
///
/// GetDescendantBounds returns the union of all of the content bounding
/// boxes of the specified Visual's sub-graph.
///
public static Rect GetDescendantBounds(Visual reference)
{
CheckVisualReferenceArgument(reference);
return reference.VisualDescendantBounds;
}
///
/// GetDescendantBounds returns the union of all of the content bounding
/// boxes of the specified Visual3D's sub-graph.
///
public static Rect3D GetDescendantBounds(Visual3D reference)
{
CheckVisualReferenceArgument(reference);
return reference.VisualDescendantBounds;
}
///
/// Gets the BitmapEffect.
///
public static BitmapEffect GetBitmapEffect(Visual reference)
{
CheckVisualReferenceArgument(reference);
#pragma warning disable 0618
return reference.VisualBitmapEffect;
#pragma warning restore 0618
}
///
/// Gets the BitmapEffectInput.
///
public static BitmapEffectInput GetBitmapEffectInput(Visual reference)
{
CheckVisualReferenceArgument(reference);
#pragma warning disable 0618
return reference.VisualBitmapEffectInput;
#pragma warning restore 0618
}
///
/// Gets the Effect.
///
public static Effect GetEffect(Visual reference)
{
CheckVisualReferenceArgument(reference);
return reference.VisualEffect;
}
///
/// Gets the EdgeMode of the Visual.
///
public static EdgeMode GetEdgeMode(Visual reference)
{
CheckVisualReferenceArgument(reference);
return reference.VisualEdgeMode;
}
///
/// Return top most visual of a hit test.
///
public static HitTestResult HitTest(Visual reference, Point point)
{
return HitTest(reference, point, true);
}
///
///
[FriendAccessAllowed]
internal static HitTestResult HitTest(Visual reference, Point point, bool include2DOn3D)
{
CheckVisualReferenceArgument(reference);
return reference.HitTest(point, include2DOn3D);
}
///
/// Initiate a hit test using delegates.
///
public static void HitTest(
Visual reference,
HitTestFilterCallback filterCallback,
HitTestResultCallback resultCallback,
HitTestParameters hitTestParameters)
{
CheckVisualReferenceArgument(reference);
reference.HitTest(filterCallback, resultCallback, hitTestParameters);
}
///
/// Initiate a hit test using delegates.
///
public static void HitTest(
Visual3D reference,
HitTestFilterCallback filterCallback,
HitTestResultCallback resultCallback,
HitTestParameters3D hitTestParameters)
{
CheckVisualReferenceArgument(reference);
reference.HitTest(filterCallback, resultCallback, hitTestParameters);
}
#if WCP_MF_ENABLED
///
/// Serialize a visual to fixed (S0) XAML
///
///
///
static internal void SaveAsXml(Visual visual, System.Xml.XmlWriter writer)
{
VisualTreeFlattener.SaveAsXml(visual, writer, new FixedXamlDesigner());
}
///
/// Walk a visual tree and flatten it to (S0) DrawingContext
///
///
///
//CASRemoval:[StrongNameIdentityPermission(SecurityAction.LinkDemand, PublicKey=Microsoft.Internal.BuildInfo.WCP_PUBLIC_KEY_STRING)]
static public void Walk(Visual visual, DrawingContext dc)
{
VisualTreeFlattener flattener = new VisualTreeFlattener(dc);
flattener.Walk(visual, null);
}
#endif // WCP_MF_ENABLED
}
}
// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.
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