Code:
/ 4.0 / 4.0 / DEVDIV_TFS / Dev10 / Releases / RTMRel / wpf / src / Core / CSharp / System / Windows / Media / HitTestWithPointDrawingContextWalker.cs / 1305600 / HitTestWithPointDrawingContextWalker.cs
//----------------------------------------------------------------------------
//
// Copyright (c) Microsoft Corporation. All rights reserved.
//
// File: HitTestWithPointDrawingContextWalker.cs
//
// Description: The implementation of HitTestWithPointDrawingContextWalker,
// used to perform hit tests with a point on renderdata.
//
// History:
// 06/20/2005 : michka - Carved it out of HitTestDrawingWalker.cs
//
//---------------------------------------------------------------------------
using MS.Internal;
using System;
using System.ComponentModel;
using System.Collections;
using System.Collections.Generic;
using System.ComponentModel.Design.Serialization;
using System.Diagnostics;
using System.Runtime.InteropServices;
using System.Windows;
using System.Windows.Media;
using System.Windows.Media.Composition;
using System.Windows.Media.Effects;
using System.Windows.Media.Imaging;
namespace System.Windows.Media
{
///
/// HitTestDrawingContextWalker - a DrawingContextWalker which performs a hit test with a point
///
internal class HitTestWithPointDrawingContextWalker: HitTestDrawingContextWalker
{
///
/// Constructor
///
/// Point - the point to hit test, in local coordinates.
internal HitTestWithPointDrawingContextWalker(Point point)
{
_point = point;
}
///
/// IsHit Property - Returns whether the point hit the drawing instructions.
///
internal override bool IsHit
{
get
{
return _contains;
}
}
internal override IntersectionDetail IntersectionDetail
{
get
{
return _contains ? IntersectionDetail.FullyInside : IntersectionDetail.Empty;
}
}
#region Static Drawing Context Methods
///
/// DrawGeometry -
/// Draw a Geometry with the provided Brush and/or Pen.
/// If both the Brush and Pen are null this call is a no-op.
///
///
/// The Brush with which to fill the Geometry.
/// This is optional, and can be null, in which case no fill is performed.
///
///
/// The Pen with which to stroke the Geometry.
/// This is optional, and can be null, in which case no stroke is performed.
///
/// The Geometry to fill and/or stroke.
public override void DrawGeometry(
Brush brush,
Pen pen,
Geometry geometry)
{
if (IsCurrentLayerNoOp ||(geometry == null) || geometry.IsEmpty())
{
return;
}
if (brush != null)
{
_contains |= geometry.FillContains(_point);
}
// If we have a pen and we haven't yet hit, try the widened geometry.
if ((pen != null) && !_contains)
{
_contains |= geometry.StrokeContains(pen, _point);
}
// If we've hit, stop walking.
if (_contains)
{
StopWalking();
}
}
///
/// Draw a GlyphRun.
///
/// Foreground brush to draw GlyphRun with.
/// The GlyphRun to draw.
///
/// This call is illegal if this object has already been closed or disposed.
///
public override void DrawGlyphRun(Brush foregroundBrush, GlyphRun glyphRun)
{
if (!IsCurrentLayerNoOp && (glyphRun != null))
{
// The InkBoundingBox + the Origin produce the true InkBoundingBox.
Rect rectangle = glyphRun.ComputeInkBoundingBox();
if (!rectangle.IsEmpty)
{
rectangle.Offset((Vector)glyphRun.BaselineOrigin);
_contains |= rectangle.Contains(_point);
// If we've hit, stop walking.
if (_contains)
{
StopWalking();
}
}
}
}
///
/// PushClip -
/// Push a clip region, which will apply to all drawing primitives until the
/// corresponding Pop call.
///
/// The Geometry to which we will clip.
public override void PushClip(
Geometry clipGeometry)
{
if (!IsPushNoOp())
{
PushPointStack(_point);
// If the clip being pushed doesn't contain the hit test point,
// then we don't need to consider any of the subsequent Drawing
// operations in this layer.
if ((clipGeometry != null) && !clipGeometry.FillContains(_point))
{
IsCurrentLayerNoOp = true;
}
}
}
///
/// PushOpacityMask -
/// Push an opacity mask
///
///
/// The opacity mask brush
///
public override void PushOpacityMask(Brush brush)
{
if (!IsPushNoOp())
{
// This Push doesn't affect the hit test, so just push the current point
PushPointStack(_point);
}
}
///
/// PushOpacity -
/// Push an opacity which will blend the composite of all drawing primitives added
/// until the corresponding Pop call.
///
///
/// The opacity with which to blend - 0 is transparent, 1 is opaque.
///
public override void PushOpacity(
Double opacity)
{
if (!IsPushNoOp())
{
// This Push doesn't affect the hit test, so just push the current point
PushPointStack(_point);
}
}
///
/// PushTransform -
/// Push a Transform which will apply to all drawing operations until the corresponding
/// Pop.
///
/// The Transform to push.
public override void PushTransform(
Transform transform)
{
if (!IsPushNoOp())
{
if (transform == null || transform.IsIdentity)
{
PushPointStack(_point);
}
else
{
Matrix matrix = transform.Value;
if (matrix.HasInverse)
{
// Invert the transform. The inverse will be applied to the point
// so that hit testing is done in the original geometry's coordinates
matrix.Invert();
// Push the transformed point on the stack. This also updates _point.
PushPointStack(_point * matrix);
}
else
{
// If this transform doesn't have an inverse, then we don't need to consider any
// of the subsequent Drawing operations in this layer.
IsCurrentLayerNoOp = true;
}
}
}
}
///
/// PushGuidelineSet -
/// Push a set of guidelines which should be applied
/// to all drawing operations until the
/// corresponding Pop.
///
/// The GuidelineSet to push.
public override void PushGuidelineSet(
GuidelineSet guidelines)
{
if (!IsPushNoOp())
{
// This Push doesn't affect the hit test, so just push the current point
PushPointStack(_point);
}
}
///
/// PushGuidelineY1 -
/// Explicitly push one horizontal guideline.
///
/// The coordinate of leading guideline.
internal override void PushGuidelineY1(
Double coordinate)
{
if (!IsPushNoOp())
{
// This Push doesn't affect the hit test, so just push the current point
PushPointStack(_point);
}
}
///
/// PushGuidelineY2 -
/// Explicitly push a pair of horizontal guidelines.
///
///
/// The coordinate of leading guideline.
///
///
/// The offset from leading guideline to driven guideline.
///
internal override void PushGuidelineY2(
Double leadingCoordinate,
Double offsetToDrivenCoordinate)
{
if (!IsPushNoOp())
{
// This Push doesn't affect the hit test, so just push the current point
PushPointStack(_point);
}
}
///
/// PushEffect -
/// Push a BitmapEffect which will apply to all drawing operations until the
/// corresponding Pop.
///
/// The BitmapEffect to push.
/// The BitmapEffectInput.
[Obsolete(MS.Internal.Media.VisualTreeUtils.BitmapEffectObsoleteMessage)]
public override void PushEffect(
BitmapEffect effect,
BitmapEffectInput effectInput)
{
if (!IsPushNoOp())
{
// This API has been deprecated, so any BitmapEffect is ignored.
PushPointStack(_point);
}
}
///
/// Pop
///
public override void Pop(
)
{
if (!IsPopNoOp())
{
PopPointStack();
}
}
#endregion Static Drawing Context Methods
#region Private Methods
///
/// PushPointStack - push a point onto the stack and update _point with it.
///
/// The new Point to push.
private void PushPointStack(Point point)
{
if (_pointStack == null)
{
_pointStack = new Stack(2);
}
// Push the old point.
_pointStack.Push(_point);
// update current point
_point = point;
}
///
/// PopPointStack - pop a point off of the point stack and update _point.
///
private void PopPointStack()
{
// We must have a point stack and it must not be empty.
Debug.Assert(_pointStack != null);
Debug.Assert(_pointStack.Count > 0);
// Retrieve the previous point from the stack.
_point = _pointStack.Pop();
}
///
/// Called by every Push operation, this method returns whether or not
/// the operation should be a no-op. If the current subgraph layer
/// is being no-op'd, it also increments the no-op depth.
///
private bool IsPushNoOp()
{
if (IsCurrentLayerNoOp)
{
// Increment the depth so that the no-op status isn't reset
// when this layer's cooresponding Pop is called.
_noOpLayerDepth++;
return true;
}
else
{
return false;
}
}
///
/// Called by Pop, this method returns whether or not Pop should be
/// a no-op'd. If the current subgraph layer is being no-op'd, it also
/// decrements the no-op depth, then reset's the no-op status if this
/// is the last Pop in the no-op layer.
///
private bool IsPopNoOp()
{
if (IsCurrentLayerNoOp)
{
Debug.Assert(_noOpLayerDepth >= 1);
_noOpLayerDepth--;
// If this Pop cooresponds to the Push that created
// the no-op layer, then reset the no-op status.
if (_noOpLayerDepth == 0)
{
IsCurrentLayerNoOp = false;
}
return true;
}
else
{
return false;
}
}
///
/// Set/resets and gets whether or not the current subgraph layer is a no-op.
/// Currently, all subsequent instructions are skipped (no-op'd) when a non-invertible
/// transform is pushed (because we have to invert the matrix to perform
/// a hit-test), or during a point hit-test when a clip is pushed that
/// doesn't contain the point.
///
private bool IsCurrentLayerNoOp
{
set
{
if (value == true)
{
// Guard that we aren't already in a no-op layer
//
// Instructions that can cause the layer to be no-op'd should be
// no-op'd themselves, and thus can't call this method, if we
// are already in a no-op layer
Debug.Assert(!_currentLayerIsNoOp);
Debug.Assert(_noOpLayerDepth == 0);
// Set the no-op status & initial depth
_currentLayerIsNoOp = true;
_noOpLayerDepth++;
}
else
{
// Guard that we are in a no-op layer, and that the correct corresponding
// Pop has been called.
Debug.Assert(_currentLayerIsNoOp);
Debug.Assert(_noOpLayerDepth == 0);
// Reset the no-op status
_currentLayerIsNoOp = false;
}
}
get
{
return _currentLayerIsNoOp;
}
}
#endregion Private Methods
#region Private Fields
// If _isPointHitTest is true, this _point is the hit test point.
private Point _point;
// The hit test point transformed to target geometry's original coordinates
private Stack _pointStack;
// When true, all instructions should be perform no logic until the
// layer is exited via a Pop()
private bool _currentLayerIsNoOp;
// Number of Pop() calls until _currentLayerIsNoOp should be reset.
private int _noOpLayerDepth;
#endregion Private Fields
}
}
// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
//----------------------------------------------------------------------------
//
// Copyright (c) Microsoft Corporation. All rights reserved.
//
// File: HitTestWithPointDrawingContextWalker.cs
//
// Description: The implementation of HitTestWithPointDrawingContextWalker,
// used to perform hit tests with a point on renderdata.
//
// History:
// 06/20/2005 : michka - Carved it out of HitTestDrawingWalker.cs
//
//---------------------------------------------------------------------------
using MS.Internal;
using System;
using System.ComponentModel;
using System.Collections;
using System.Collections.Generic;
using System.ComponentModel.Design.Serialization;
using System.Diagnostics;
using System.Runtime.InteropServices;
using System.Windows;
using System.Windows.Media;
using System.Windows.Media.Composition;
using System.Windows.Media.Effects;
using System.Windows.Media.Imaging;
namespace System.Windows.Media
{
///
/// HitTestDrawingContextWalker - a DrawingContextWalker which performs a hit test with a point
///
internal class HitTestWithPointDrawingContextWalker: HitTestDrawingContextWalker
{
///
/// Constructor
///
/// Point - the point to hit test, in local coordinates.
internal HitTestWithPointDrawingContextWalker(Point point)
{
_point = point;
}
///
/// IsHit Property - Returns whether the point hit the drawing instructions.
///
internal override bool IsHit
{
get
{
return _contains;
}
}
internal override IntersectionDetail IntersectionDetail
{
get
{
return _contains ? IntersectionDetail.FullyInside : IntersectionDetail.Empty;
}
}
#region Static Drawing Context Methods
///
/// DrawGeometry -
/// Draw a Geometry with the provided Brush and/or Pen.
/// If both the Brush and Pen are null this call is a no-op.
///
///
/// The Brush with which to fill the Geometry.
/// This is optional, and can be null, in which case no fill is performed.
///
///
/// The Pen with which to stroke the Geometry.
/// This is optional, and can be null, in which case no stroke is performed.
///
/// The Geometry to fill and/or stroke.
public override void DrawGeometry(
Brush brush,
Pen pen,
Geometry geometry)
{
if (IsCurrentLayerNoOp ||(geometry == null) || geometry.IsEmpty())
{
return;
}
if (brush != null)
{
_contains |= geometry.FillContains(_point);
}
// If we have a pen and we haven't yet hit, try the widened geometry.
if ((pen != null) && !_contains)
{
_contains |= geometry.StrokeContains(pen, _point);
}
// If we've hit, stop walking.
if (_contains)
{
StopWalking();
}
}
///
/// Draw a GlyphRun.
///
/// Foreground brush to draw GlyphRun with.
/// The GlyphRun to draw.
///
/// This call is illegal if this object has already been closed or disposed.
///
public override void DrawGlyphRun(Brush foregroundBrush, GlyphRun glyphRun)
{
if (!IsCurrentLayerNoOp && (glyphRun != null))
{
// The InkBoundingBox + the Origin produce the true InkBoundingBox.
Rect rectangle = glyphRun.ComputeInkBoundingBox();
if (!rectangle.IsEmpty)
{
rectangle.Offset((Vector)glyphRun.BaselineOrigin);
_contains |= rectangle.Contains(_point);
// If we've hit, stop walking.
if (_contains)
{
StopWalking();
}
}
}
}
///
/// PushClip -
/// Push a clip region, which will apply to all drawing primitives until the
/// corresponding Pop call.
///
/// The Geometry to which we will clip.
public override void PushClip(
Geometry clipGeometry)
{
if (!IsPushNoOp())
{
PushPointStack(_point);
// If the clip being pushed doesn't contain the hit test point,
// then we don't need to consider any of the subsequent Drawing
// operations in this layer.
if ((clipGeometry != null) && !clipGeometry.FillContains(_point))
{
IsCurrentLayerNoOp = true;
}
}
}
///
/// PushOpacityMask -
/// Push an opacity mask
///
///
/// The opacity mask brush
///
public override void PushOpacityMask(Brush brush)
{
if (!IsPushNoOp())
{
// This Push doesn't affect the hit test, so just push the current point
PushPointStack(_point);
}
}
///
/// PushOpacity -
/// Push an opacity which will blend the composite of all drawing primitives added
/// until the corresponding Pop call.
///
///
/// The opacity with which to blend - 0 is transparent, 1 is opaque.
///
public override void PushOpacity(
Double opacity)
{
if (!IsPushNoOp())
{
// This Push doesn't affect the hit test, so just push the current point
PushPointStack(_point);
}
}
///
/// PushTransform -
/// Push a Transform which will apply to all drawing operations until the corresponding
/// Pop.
///
/// The Transform to push.
public override void PushTransform(
Transform transform)
{
if (!IsPushNoOp())
{
if (transform == null || transform.IsIdentity)
{
PushPointStack(_point);
}
else
{
Matrix matrix = transform.Value;
if (matrix.HasInverse)
{
// Invert the transform. The inverse will be applied to the point
// so that hit testing is done in the original geometry's coordinates
matrix.Invert();
// Push the transformed point on the stack. This also updates _point.
PushPointStack(_point * matrix);
}
else
{
// If this transform doesn't have an inverse, then we don't need to consider any
// of the subsequent Drawing operations in this layer.
IsCurrentLayerNoOp = true;
}
}
}
}
///
/// PushGuidelineSet -
/// Push a set of guidelines which should be applied
/// to all drawing operations until the
/// corresponding Pop.
///
/// The GuidelineSet to push.
public override void PushGuidelineSet(
GuidelineSet guidelines)
{
if (!IsPushNoOp())
{
// This Push doesn't affect the hit test, so just push the current point
PushPointStack(_point);
}
}
///
/// PushGuidelineY1 -
/// Explicitly push one horizontal guideline.
///
/// The coordinate of leading guideline.
internal override void PushGuidelineY1(
Double coordinate)
{
if (!IsPushNoOp())
{
// This Push doesn't affect the hit test, so just push the current point
PushPointStack(_point);
}
}
///
/// PushGuidelineY2 -
/// Explicitly push a pair of horizontal guidelines.
///
///
/// The coordinate of leading guideline.
///
///
/// The offset from leading guideline to driven guideline.
///
internal override void PushGuidelineY2(
Double leadingCoordinate,
Double offsetToDrivenCoordinate)
{
if (!IsPushNoOp())
{
// This Push doesn't affect the hit test, so just push the current point
PushPointStack(_point);
}
}
///
/// PushEffect -
/// Push a BitmapEffect which will apply to all drawing operations until the
/// corresponding Pop.
///
/// The BitmapEffect to push.
/// The BitmapEffectInput.
[Obsolete(MS.Internal.Media.VisualTreeUtils.BitmapEffectObsoleteMessage)]
public override void PushEffect(
BitmapEffect effect,
BitmapEffectInput effectInput)
{
if (!IsPushNoOp())
{
// This API has been deprecated, so any BitmapEffect is ignored.
PushPointStack(_point);
}
}
///
/// Pop
///
public override void Pop(
)
{
if (!IsPopNoOp())
{
PopPointStack();
}
}
#endregion Static Drawing Context Methods
#region Private Methods
///
/// PushPointStack - push a point onto the stack and update _point with it.
///
/// The new Point to push.
private void PushPointStack(Point point)
{
if (_pointStack == null)
{
_pointStack = new Stack(2);
}
// Push the old point.
_pointStack.Push(_point);
// update current point
_point = point;
}
///
/// PopPointStack - pop a point off of the point stack and update _point.
///
private void PopPointStack()
{
// We must have a point stack and it must not be empty.
Debug.Assert(_pointStack != null);
Debug.Assert(_pointStack.Count > 0);
// Retrieve the previous point from the stack.
_point = _pointStack.Pop();
}
///
/// Called by every Push operation, this method returns whether or not
/// the operation should be a no-op. If the current subgraph layer
/// is being no-op'd, it also increments the no-op depth.
///
private bool IsPushNoOp()
{
if (IsCurrentLayerNoOp)
{
// Increment the depth so that the no-op status isn't reset
// when this layer's cooresponding Pop is called.
_noOpLayerDepth++;
return true;
}
else
{
return false;
}
}
///
/// Called by Pop, this method returns whether or not Pop should be
/// a no-op'd. If the current subgraph layer is being no-op'd, it also
/// decrements the no-op depth, then reset's the no-op status if this
/// is the last Pop in the no-op layer.
///
private bool IsPopNoOp()
{
if (IsCurrentLayerNoOp)
{
Debug.Assert(_noOpLayerDepth >= 1);
_noOpLayerDepth--;
// If this Pop cooresponds to the Push that created
// the no-op layer, then reset the no-op status.
if (_noOpLayerDepth == 0)
{
IsCurrentLayerNoOp = false;
}
return true;
}
else
{
return false;
}
}
///
/// Set/resets and gets whether or not the current subgraph layer is a no-op.
/// Currently, all subsequent instructions are skipped (no-op'd) when a non-invertible
/// transform is pushed (because we have to invert the matrix to perform
/// a hit-test), or during a point hit-test when a clip is pushed that
/// doesn't contain the point.
///
private bool IsCurrentLayerNoOp
{
set
{
if (value == true)
{
// Guard that we aren't already in a no-op layer
//
// Instructions that can cause the layer to be no-op'd should be
// no-op'd themselves, and thus can't call this method, if we
// are already in a no-op layer
Debug.Assert(!_currentLayerIsNoOp);
Debug.Assert(_noOpLayerDepth == 0);
// Set the no-op status & initial depth
_currentLayerIsNoOp = true;
_noOpLayerDepth++;
}
else
{
// Guard that we are in a no-op layer, and that the correct corresponding
// Pop has been called.
Debug.Assert(_currentLayerIsNoOp);
Debug.Assert(_noOpLayerDepth == 0);
// Reset the no-op status
_currentLayerIsNoOp = false;
}
}
get
{
return _currentLayerIsNoOp;
}
}
#endregion Private Methods
#region Private Fields
// If _isPointHitTest is true, this _point is the hit test point.
private Point _point;
// The hit test point transformed to target geometry's original coordinates
private Stack _pointStack;
// When true, all instructions should be perform no logic until the
// layer is exited via a Pop()
private bool _currentLayerIsNoOp;
// Number of Pop() calls until _currentLayerIsNoOp should be reset.
private int _noOpLayerDepth;
#endregion Private Fields
}
}
// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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