Code:
/ Net / Net / 3.5.50727.3053 / DEVDIV / depot / DevDiv / releases / Orcas / SP / wpf / src / Core / CSharp / MS / Internal / Ink / Renderer.cs / 1 / Renderer.cs
//------------------------------------------------------------------------
//
// Copyright (c) Microsoft Corporation. All rights reserved.
//
//-----------------------------------------------------------------------
using MS.Utility;
using System;
using System.Windows;
using System.Windows.Media;
using System.Collections;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.Diagnostics;
using MS.Internal.Ink;
using MS.Internal;
using MS.Internal.PresentationCore;
namespace System.Windows.Ink
{
///
/// The Renderer class is used to render a stroke collection.
/// This class listens to stroke added and removed events on the
/// stroke collection and updates the internal visual tree.
/// It also listens to the Invalidated event on Stroke (fired when
/// DrawingAttributes changes, packet data changes, DrawingAttributes
/// replaced, as well as Stroke developer calls Stroke.OnInvalidated)
/// and updates the visual state as necessary.
///
///
[FriendAccessAllowed] // Built into Core, also used by Framework.
internal class Renderer
{
#region StrokeVisual
///
/// A retained visual for rendering a single stroke in a stroke collection view
///
private class StrokeVisual : System.Windows.Media.DrawingVisual
{
///
/// Constructor
///
/// a stroke to render into this visual
/// a renderer associated to this visual
internal StrokeVisual(Stroke stroke, Renderer renderer) : base()
{
Debug.Assert(renderer != null);
if (stroke == null)
{
throw new System.ArgumentNullException("stroke");
}
_stroke = stroke;
_renderer = renderer;
// The original value of the color and IsHighlighter are cached so
// when Stroke.Invalidated is fired, Renderer knows whether re-arranging
// the visual tree is needed.
_cachedColor = stroke.DrawingAttributes.Color;
_cachedIsHighlighter = stroke.DrawingAttributes.IsHighlighter;
// Update the visual contents
Update();
}
///
/// The Stroke rendedered into this visual.
///
internal Stroke Stroke
{
get { return _stroke; }
}
///
/// Updates the contents of the visual.
///
internal void Update()
{
using (DrawingContext drawingContext = RenderOpen())
{
bool highContrast = _renderer.IsHighContrast();
if (highContrast == true && _stroke.DrawingAttributes.IsHighlighter)
{
// we don't render highlighters in high contrast
return;
}
DrawingAttributes da;
if (highContrast)
{
da = _stroke.DrawingAttributes.Clone();
da.Color = _renderer.GetHighContrastColor();
}
else if (_stroke.DrawingAttributes.IsHighlighter == true)
{
// Get the drawing attributes to use for a highlighter stroke. This can be a copied DA with color.A
// overridden if color.A != 255.
da = StrokeRenderer.GetHighlighterAttributes(_stroke, _stroke.DrawingAttributes);
}
else
{
// Otherwise, usethe DA on this stroke
da = _stroke.DrawingAttributes;
}
// Draw selected stroke as hollow
_stroke.DrawInternal (drawingContext, da, _stroke.IsSelected );
}
}
///
/// StrokeVisual should not be hittestable as it interferes with event routing
///
protected override HitTestResult HitTestCore(PointHitTestParameters hitTestParams)
{
return null;
}
///
/// The previous value of IsHighlighter
///
internal bool CachedIsHighlighter
{
get {return _cachedIsHighlighter;}
set {_cachedIsHighlighter = value;}
}
///
/// The previous value of Color
///
internal Color CachedColor
{
get {return _cachedColor;}
set {_cachedColor = value;}
}
private Stroke _stroke;
private bool _cachedIsHighlighter;
private Color _cachedColor;
private Renderer _renderer;
}
///
/// Private helper that helps reverse map the highlighter dictionary
///
private class HighlighterContainerVisual : ContainerVisual
{
internal HighlighterContainerVisual(Color color)
{
_color = color;
}
///
/// The Color of the strokes in this highlighter container visual
///
internal Color Color
{
get { return _color; }
}
private Color _color;
}
#endregion
#region Internal interface
///
/// Public Constructor
///
internal Renderer()
{
// Initialize the data members.
// We intentionally don't use lazy initialization for the core members to avoid
// hidden bug situations when one thing has been created while another not.
// If the user is looking for lazy initialization, she should do that on her
// own and create Renderer only when there's a need for it.
// Create visuals that'll be the containers for all other visuals
// created by the Renderer. This visuals are created once and are
// not supposed to be replaced nor destroyed while the Renderer is alive.
_rootVisual = new ContainerVisual();
_highlightersRoot = new ContainerVisual();
_regularInkVisuals = new ContainerVisual();
_incrementalRenderingVisuals = new ContainerVisual();
// Highlighters go to the bottom, then regular ink, and regular
// ink' incremental rendering in on top.
VisualCollection rootChildren = _rootVisual.Children;
rootChildren.Add(_highlightersRoot);
rootChildren.Add(_regularInkVisuals);
rootChildren.Add(_incrementalRenderingVisuals);
// Set the default value of highcontrast to be false.
_highContrast = false;
// Create a stroke-visual dictionary
_visuals = new Dictionary();
}
///
/// Returns a reference to a visual tree that can be used to render the ink.
/// This property may be either a single visual or a container visual with
/// children. The element uses this visual as a child visual and arranges
/// it with respects to the other siblings.
/// Note: No visuals are actually generated until the application gets
/// this property for the first time. If no strokes are set then an empty
/// visual is returned.
///
internal Visual RootVisual { get { return _rootVisual; } }
///
/// Set the strokes property to the collection of strokes to be rendered.
/// The Renderer will then listen to changes to the StrokeCollection
/// and update its state to reflect the changes.
///
internal StrokeCollection Strokes
{
get
{
// We should never return a null value.
if ( _strokes == null )
{
_strokes = new StrokeCollection();
// Start listening on events from the stroke collection.
_strokes.StrokesChangedInternal += new StrokeCollectionChangedEventHandler(OnStrokesChanged);
}
return _strokes;
}
set
{
if (value == null)
{
throw new System.ArgumentNullException("value");
}
if (value == _strokes)
{
return;
}
// Detach the current stroke collection
if (null != _strokes)
{
// Stop listening on events from the stroke collection.
_strokes.StrokesChangedInternal -= new StrokeCollectionChangedEventHandler(OnStrokesChanged);
foreach (StrokeVisual visual in _visuals.Values)
{
StopListeningOnStrokeEvents(visual.Stroke);
// Detach the visual from the tree
DetachVisual(visual);
}
_visuals.Clear();
}
// Set it.
_strokes = value;
// Create visuals
foreach (Stroke stroke in _strokes)
{
// Create a visual per stroke
StrokeVisual visual = new StrokeVisual(stroke, this);
// Store the stroke-visual pair in the dictionary
_visuals.Add(stroke, visual);
StartListeningOnStrokeEvents(visual.Stroke);
// Attach it to the visual tree
AttachVisual(visual, true/*buildingStrokeCollection*/);
}
// Start listening on events from the stroke collection.
_strokes.StrokesChangedInternal += new StrokeCollectionChangedEventHandler(OnStrokesChanged);
}
}
///
/// User supposed to use this method to attach IncrementalRenderer's root visual
/// to the visual tree of a stroke collection view.
///
/// visual to attach
/// drawing attributes that used in the incremental rendering
internal void AttachIncrementalRendering(Visual visual, DrawingAttributes drawingAttributes)
{
// Check the input parameters
if (visual == null)
{
throw new System.ArgumentNullException("visual");
}
if (drawingAttributes == null)
{
throw new System.ArgumentNullException("drawingAttributes");
}
//harden against eaten exceptions
bool exceptionRaised = false;
// Verify that the visual hasn't been attached already
if (_attachedVisuals != null)
{
foreach(Visual alreadyAttachedVisual in _attachedVisuals)
{
if (visual == alreadyAttachedVisual)
{
exceptionRaised = true;
throw new System.InvalidOperationException(SR.Get(SRID.CannotAttachVisualTwice));
}
}
}
else
{
// Create the list to register attached visuals in
_attachedVisuals = new List();
}
if (!exceptionRaised)
{
// The position of the visual in the tree depends on the drawingAttributes
// Find the appropriate parent visual to attach this visual to.
ContainerVisual parent = drawingAttributes.IsHighlighter ? GetContainerVisual(drawingAttributes) : _incrementalRenderingVisuals;
// Attach the visual to the tree
parent.Children.Add(visual);
// Put the visual into the list of visuals attached via this method
_attachedVisuals.Add(visual);
}
}
///
/// Detaches a visual previously attached via AttachIncrementalRendering
///
/// the visual to detach
internal void DetachIncrementalRendering(Visual visual)
{
if (visual == null)
{
throw new System.ArgumentNullException("visual");
}
// Remove the visual in the list of attached via AttachIncrementalRendering
if ((_attachedVisuals == null) || (_attachedVisuals.Remove(visual) == false))
{
throw new System.InvalidOperationException(SR.Get(SRID.VisualCannotBeDetached));
}
// Detach it from the tree
DetachVisual(visual);
}
///
/// Internal helper used to indicate if a visual was previously attached
/// via a call to AttachIncrementalRendering
///
internal bool ContainsAttachedIncrementalRenderingVisual(Visual visual)
{
if (visual == null || _attachedVisuals == null)
{
return false;
}
return _attachedVisuals.Contains(visual);
}
///
/// Internal helper used to determine if a visual is in the right spot in the visual tree
///
internal bool AttachedVisualIsPositionedCorrectly(Visual visual, DrawingAttributes drawingAttributes)
{
if (visual == null || drawingAttributes == null || _attachedVisuals == null || !_attachedVisuals.Contains(visual))
{
return false;
}
ContainerVisual correctParent
= drawingAttributes.IsHighlighter ? GetContainerVisual(drawingAttributes) : _incrementalRenderingVisuals;
ContainerVisual currentParent
= VisualTreeHelper.GetParent(visual) as ContainerVisual;
if (currentParent == null || correctParent != currentParent)
{
return false;
}
return true;
}
///
/// TurnOnHighContrast turns on the HighContrast rendering mode
///
/// The stroke color under high contrast
internal void TurnHighContrastOn(Color strokeColor)
{
if ( !_highContrast || strokeColor != _highContrastColor )
{
_highContrast = true;
_highContrastColor = strokeColor;
UpdateStrokeVisuals();
}
}
///
/// ResetHighContrast turns off the HighContrast mode
///
internal void TurnHighContrastOff()
{
if ( _highContrast )
{
_highContrast = false;
UpdateStrokeVisuals();
}
}
///
/// Indicates whether the renderer is in high contrast mode.
///
///
/// returns the stroke color for the high contrast rendering.
///
///
/// StrokeCollectionChanged event handler
///
private void OnStrokesChanged(object sender, StrokeCollectionChangedEventArgs eventArgs)
{
System.Diagnostics.Debug.Assert(sender == _strokes);
// Read the args
StrokeCollection added = eventArgs.Added;
StrokeCollection removed = eventArgs.Removed;
// Add new strokes
foreach (Stroke stroke in added)
{
// Verify that it's not a dupe
if (_visuals.ContainsKey(stroke))
{
throw new System.ArgumentException(SR.Get(SRID.DuplicateStrokeAdded));
}
// Create a visual for the new stroke and add it to the dictionary
StrokeVisual visual = new StrokeVisual(stroke, this);
_visuals.Add(stroke, visual);
// Start listening on the stroke events
StartListeningOnStrokeEvents(visual.Stroke);
// Attach it to the visual tree
AttachVisual(visual, false/*buildingStrokeCollection*/);
}
// Deal with removed strokes first
foreach (Stroke stroke in removed)
{
// Verify that the event is in [....] with the view
StrokeVisual visual = null;
if (_visuals.TryGetValue(stroke, out visual))
{
// get rid of both the visual and the stroke
DetachVisual(visual);
StopListeningOnStrokeEvents(visual.Stroke);
_visuals.Remove(stroke);
}
else
{
throw new System.ArgumentException(SR.Get(SRID.UnknownStroke3));
}
}
}
///
/// Stroke Invalidated event handler
///
private void OnStrokeInvalidated(object sender, EventArgs eventArgs)
{
System.Diagnostics.Debug.Assert(_strokes.IndexOf(sender as Stroke) != -1);
// Find the visual associated with the changed stroke.
StrokeVisual visual;
Stroke stroke = (Stroke)sender;
if (_visuals.TryGetValue(stroke, out visual) == false)
{
throw new System.ArgumentException(SR.Get(SRID.UnknownStroke1));
}
// The original value of IsHighligher and Color are cached in StrokeVisual.
// if (IsHighlighter value changed or (IsHighlighter == true and not changed and color changed)
// detach and re-attach the corresponding visual;
// otherwise Invalidate the corresponding StrokeVisual
if (visual.CachedIsHighlighter != stroke.DrawingAttributes.IsHighlighter ||
(stroke.DrawingAttributes.IsHighlighter &&
StrokeRenderer.GetHighlighterColor(visual.CachedColor) != StrokeRenderer.GetHighlighterColor(stroke.DrawingAttributes.Color)))
{
// The change requires reparenting the visual in the tree.
DetachVisual(visual);
AttachVisual(visual, false/*buildingStrokeCollection*/);
// Update the cached values
visual.CachedIsHighlighter = stroke.DrawingAttributes.IsHighlighter;
visual.CachedColor = stroke.DrawingAttributes.Color;
}
// Update the visual.
visual.Update();
}
#endregion
#region Helper methods
///
/// Update the stroke visuals
///
private void UpdateStrokeVisuals()
{
foreach ( StrokeVisual strokeVisual in _visuals.Values )
{
strokeVisual.Update();
}
}
///
/// Attaches a stroke visual to the tree based on the stroke's
/// drawing attributes and/or its z-order (index in the collection).
///
private void AttachVisual(StrokeVisual visual, bool buildingStrokeCollection)
{
System.Diagnostics.Debug.Assert(_strokes != null);
if (visual.Stroke.DrawingAttributes.IsHighlighter)
{
// Find or create a container visual for highlighter strokes of the color
ContainerVisual parent = GetContainerVisual(visual.Stroke.DrawingAttributes);
Debug.Assert(visual is StrokeVisual);
//insert StrokeVisuals under any non-StrokeVisuals used for dynamic inking
int i = 0;
for (int j = parent.Children.Count - 1; j >= 0; j--)
{
if (parent.Children[j] is StrokeVisual)
{
i = j + 1;
break;
}
}
parent.Children.Insert(i, visual);
}
else
{
// For regular ink we have to respect the z-order of the strokes.
// The implementation below is not optimal in a generic case, but the
// most simple and should work ok in most common scenarios.
// Find the nearest non-highlighter stroke with a lower z-order
// and insert the new visual right next to the visual of that stroke.
StrokeVisual precedingVisual = null;
int i = 0;
if (buildingStrokeCollection)
{
Stroke visualStroke = visual.Stroke;
//we're building up a stroke collection, no need to start at IndexOf,
i = Math.Min(_visuals.Count, _strokes.Count); //not -1, we're about to decrement
while (--i >= 0)
{
if (object.ReferenceEquals(_strokes[i], visualStroke))
{
break;
}
}
}
else
{
i = _strokes.IndexOf(visual.Stroke);
}
while (--i >= 0)
{
Stroke stroke = _strokes[i];
if ((stroke.DrawingAttributes.IsHighlighter == false)
&& (_visuals.TryGetValue(stroke, out precedingVisual) == true)
&& (VisualTreeHelper.GetParent(precedingVisual) != null))
{
VisualCollection children = ((ContainerVisual)(VisualTreeHelper.GetParent(precedingVisual))).Children;
int index = children.IndexOf(precedingVisual);
children.Insert(index + 1, visual);
break;
}
}
// If found no non-highlighter strokes with a lower z-order, insert
// the stroke at the very bottom of the regular ink visual tree.
if (i < 0)
{
ContainerVisual parent = GetContainerVisual(visual.Stroke.DrawingAttributes);
parent.Children.Insert(0, visual);
}
}
}
///
/// Detaches a visual from the tree, also removes highligher parents if empty
/// when true is passed
///
private void DetachVisual(Visual visual)
{
ContainerVisual parent = (ContainerVisual)(VisualTreeHelper.GetParent(visual));
if (parent != null)
{
VisualCollection children = parent.Children;
children.Remove(visual);
// If the parent is a childless highlighter, detach it too.
HighlighterContainerVisual hcVisual = parent as HighlighterContainerVisual;
if (hcVisual != null &&
hcVisual.Children.Count == 0 &&
_highlighters != null &&
_highlighters.ContainsValue(hcVisual))
{
DetachVisual(hcVisual);
_highlighters.Remove(hcVisual.Color);
}
}
}
///
/// Attaches event handlers to stroke events
///
private void StartListeningOnStrokeEvents(Stroke stroke)
{
System.Diagnostics.Debug.Assert(stroke != null);
stroke.Invalidated += new EventHandler(OnStrokeInvalidated);
}
///
/// Detaches event handlers from stroke
///
private void StopListeningOnStrokeEvents(Stroke stroke)
{
System.Diagnostics.Debug.Assert(stroke != null);
stroke.Invalidated -= new EventHandler(OnStrokeInvalidated);
}
///
/// Finds a container for a new visual based on the drawing attributes
/// of the stroke rendered into that visual.
///
/// drawing attributes
/// visual
private ContainerVisual GetContainerVisual(DrawingAttributes drawingAttributes)
{
System.Diagnostics.Debug.Assert(drawingAttributes != null);
HighlighterContainerVisual hcVisual;
if (drawingAttributes.IsHighlighter)
{
// For a highlighter stroke, the color.A is neglected.
Color color = StrokeRenderer.GetHighlighterColor(drawingAttributes.Color);
if ((_highlighters == null) || (_highlighters.TryGetValue(color, out hcVisual) == false))
{
if (_highlighters == null)
{
_highlighters = new Dictionary();
}
hcVisual = new HighlighterContainerVisual(color);
hcVisual.Opacity = StrokeRenderer.HighlighterOpacity;
_highlightersRoot.Children.Add(hcVisual);
_highlighters.Add(color, hcVisual);
}
else if (VisualTreeHelper.GetParent(hcVisual) == null)
{
_highlightersRoot.Children.Add(hcVisual);
}
return hcVisual;
}
else
{
return _regularInkVisuals;
}
}
#endregion
#region Fields
// The renderer's top level container visuals
private ContainerVisual _rootVisual;
private ContainerVisual _highlightersRoot;
private ContainerVisual _incrementalRenderingVisuals;
private ContainerVisual _regularInkVisuals;
// Stroke-to-visual map
private Dictionary _visuals;
// Color-to-visual map for highlighter ink container visuals
private Dictionary _highlighters = null;
// Collection of strokes this Renderer renders
private StrokeCollection _strokes = null;
// List of visuals attached via AttachIncrementalRendering
private List _attachedVisuals = null;
// Whhen true, will render in high contrast mode
private bool _highContrast;
private Color _highContrastColor = Colors.White;
#endregion
}
}
// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
//------------------------------------------------------------------------
//
// Copyright (c) Microsoft Corporation. All rights reserved.
//
//-----------------------------------------------------------------------
using MS.Utility;
using System;
using System.Windows;
using System.Windows.Media;
using System.Collections;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.Diagnostics;
using MS.Internal.Ink;
using MS.Internal;
using MS.Internal.PresentationCore;
namespace System.Windows.Ink
{
///
/// The Renderer class is used to render a stroke collection.
/// This class listens to stroke added and removed events on the
/// stroke collection and updates the internal visual tree.
/// It also listens to the Invalidated event on Stroke (fired when
/// DrawingAttributes changes, packet data changes, DrawingAttributes
/// replaced, as well as Stroke developer calls Stroke.OnInvalidated)
/// and updates the visual state as necessary.
///
///
[FriendAccessAllowed] // Built into Core, also used by Framework.
internal class Renderer
{
#region StrokeVisual
///
/// A retained visual for rendering a single stroke in a stroke collection view
///
private class StrokeVisual : System.Windows.Media.DrawingVisual
{
///
/// Constructor
///
/// a stroke to render into this visual
/// a renderer associated to this visual
internal StrokeVisual(Stroke stroke, Renderer renderer) : base()
{
Debug.Assert(renderer != null);
if (stroke == null)
{
throw new System.ArgumentNullException("stroke");
}
_stroke = stroke;
_renderer = renderer;
// The original value of the color and IsHighlighter are cached so
// when Stroke.Invalidated is fired, Renderer knows whether re-arranging
// the visual tree is needed.
_cachedColor = stroke.DrawingAttributes.Color;
_cachedIsHighlighter = stroke.DrawingAttributes.IsHighlighter;
// Update the visual contents
Update();
}
///
/// The Stroke rendedered into this visual.
///
internal Stroke Stroke
{
get { return _stroke; }
}
///
/// Updates the contents of the visual.
///
internal void Update()
{
using (DrawingContext drawingContext = RenderOpen())
{
bool highContrast = _renderer.IsHighContrast();
if (highContrast == true && _stroke.DrawingAttributes.IsHighlighter)
{
// we don't render highlighters in high contrast
return;
}
DrawingAttributes da;
if (highContrast)
{
da = _stroke.DrawingAttributes.Clone();
da.Color = _renderer.GetHighContrastColor();
}
else if (_stroke.DrawingAttributes.IsHighlighter == true)
{
// Get the drawing attributes to use for a highlighter stroke. This can be a copied DA with color.A
// overridden if color.A != 255.
da = StrokeRenderer.GetHighlighterAttributes(_stroke, _stroke.DrawingAttributes);
}
else
{
// Otherwise, usethe DA on this stroke
da = _stroke.DrawingAttributes;
}
// Draw selected stroke as hollow
_stroke.DrawInternal (drawingContext, da, _stroke.IsSelected );
}
}
///
/// StrokeVisual should not be hittestable as it interferes with event routing
///
protected override HitTestResult HitTestCore(PointHitTestParameters hitTestParams)
{
return null;
}
///
/// The previous value of IsHighlighter
///
internal bool CachedIsHighlighter
{
get {return _cachedIsHighlighter;}
set {_cachedIsHighlighter = value;}
}
///
/// The previous value of Color
///
internal Color CachedColor
{
get {return _cachedColor;}
set {_cachedColor = value;}
}
private Stroke _stroke;
private bool _cachedIsHighlighter;
private Color _cachedColor;
private Renderer _renderer;
}
///
/// Private helper that helps reverse map the highlighter dictionary
///
private class HighlighterContainerVisual : ContainerVisual
{
internal HighlighterContainerVisual(Color color)
{
_color = color;
}
///
/// The Color of the strokes in this highlighter container visual
///
internal Color Color
{
get { return _color; }
}
private Color _color;
}
#endregion
#region Internal interface
///
/// Public Constructor
///
internal Renderer()
{
// Initialize the data members.
// We intentionally don't use lazy initialization for the core members to avoid
// hidden bug situations when one thing has been created while another not.
// If the user is looking for lazy initialization, she should do that on her
// own and create Renderer only when there's a need for it.
// Create visuals that'll be the containers for all other visuals
// created by the Renderer. This visuals are created once and are
// not supposed to be replaced nor destroyed while the Renderer is alive.
_rootVisual = new ContainerVisual();
_highlightersRoot = new ContainerVisual();
_regularInkVisuals = new ContainerVisual();
_incrementalRenderingVisuals = new ContainerVisual();
// Highlighters go to the bottom, then regular ink, and regular
// ink' incremental rendering in on top.
VisualCollection rootChildren = _rootVisual.Children;
rootChildren.Add(_highlightersRoot);
rootChildren.Add(_regularInkVisuals);
rootChildren.Add(_incrementalRenderingVisuals);
// Set the default value of highcontrast to be false.
_highContrast = false;
// Create a stroke-visual dictionary
_visuals = new Dictionary();
}
///
/// Returns a reference to a visual tree that can be used to render the ink.
/// This property may be either a single visual or a container visual with
/// children. The element uses this visual as a child visual and arranges
/// it with respects to the other siblings.
/// Note: No visuals are actually generated until the application gets
/// this property for the first time. If no strokes are set then an empty
/// visual is returned.
///
internal Visual RootVisual { get { return _rootVisual; } }
///
/// Set the strokes property to the collection of strokes to be rendered.
/// The Renderer will then listen to changes to the StrokeCollection
/// and update its state to reflect the changes.
///
internal StrokeCollection Strokes
{
get
{
// We should never return a null value.
if ( _strokes == null )
{
_strokes = new StrokeCollection();
// Start listening on events from the stroke collection.
_strokes.StrokesChangedInternal += new StrokeCollectionChangedEventHandler(OnStrokesChanged);
}
return _strokes;
}
set
{
if (value == null)
{
throw new System.ArgumentNullException("value");
}
if (value == _strokes)
{
return;
}
// Detach the current stroke collection
if (null != _strokes)
{
// Stop listening on events from the stroke collection.
_strokes.StrokesChangedInternal -= new StrokeCollectionChangedEventHandler(OnStrokesChanged);
foreach (StrokeVisual visual in _visuals.Values)
{
StopListeningOnStrokeEvents(visual.Stroke);
// Detach the visual from the tree
DetachVisual(visual);
}
_visuals.Clear();
}
// Set it.
_strokes = value;
// Create visuals
foreach (Stroke stroke in _strokes)
{
// Create a visual per stroke
StrokeVisual visual = new StrokeVisual(stroke, this);
// Store the stroke-visual pair in the dictionary
_visuals.Add(stroke, visual);
StartListeningOnStrokeEvents(visual.Stroke);
// Attach it to the visual tree
AttachVisual(visual, true/*buildingStrokeCollection*/);
}
// Start listening on events from the stroke collection.
_strokes.StrokesChangedInternal += new StrokeCollectionChangedEventHandler(OnStrokesChanged);
}
}
///
/// User supposed to use this method to attach IncrementalRenderer's root visual
/// to the visual tree of a stroke collection view.
///
/// visual to attach
/// drawing attributes that used in the incremental rendering
internal void AttachIncrementalRendering(Visual visual, DrawingAttributes drawingAttributes)
{
// Check the input parameters
if (visual == null)
{
throw new System.ArgumentNullException("visual");
}
if (drawingAttributes == null)
{
throw new System.ArgumentNullException("drawingAttributes");
}
//harden against eaten exceptions
bool exceptionRaised = false;
// Verify that the visual hasn't been attached already
if (_attachedVisuals != null)
{
foreach(Visual alreadyAttachedVisual in _attachedVisuals)
{
if (visual == alreadyAttachedVisual)
{
exceptionRaised = true;
throw new System.InvalidOperationException(SR.Get(SRID.CannotAttachVisualTwice));
}
}
}
else
{
// Create the list to register attached visuals in
_attachedVisuals = new List();
}
if (!exceptionRaised)
{
// The position of the visual in the tree depends on the drawingAttributes
// Find the appropriate parent visual to attach this visual to.
ContainerVisual parent = drawingAttributes.IsHighlighter ? GetContainerVisual(drawingAttributes) : _incrementalRenderingVisuals;
// Attach the visual to the tree
parent.Children.Add(visual);
// Put the visual into the list of visuals attached via this method
_attachedVisuals.Add(visual);
}
}
///
/// Detaches a visual previously attached via AttachIncrementalRendering
///
/// the visual to detach
internal void DetachIncrementalRendering(Visual visual)
{
if (visual == null)
{
throw new System.ArgumentNullException("visual");
}
// Remove the visual in the list of attached via AttachIncrementalRendering
if ((_attachedVisuals == null) || (_attachedVisuals.Remove(visual) == false))
{
throw new System.InvalidOperationException(SR.Get(SRID.VisualCannotBeDetached));
}
// Detach it from the tree
DetachVisual(visual);
}
///
/// Internal helper used to indicate if a visual was previously attached
/// via a call to AttachIncrementalRendering
///
internal bool ContainsAttachedIncrementalRenderingVisual(Visual visual)
{
if (visual == null || _attachedVisuals == null)
{
return false;
}
return _attachedVisuals.Contains(visual);
}
///
/// Internal helper used to determine if a visual is in the right spot in the visual tree
///
internal bool AttachedVisualIsPositionedCorrectly(Visual visual, DrawingAttributes drawingAttributes)
{
if (visual == null || drawingAttributes == null || _attachedVisuals == null || !_attachedVisuals.Contains(visual))
{
return false;
}
ContainerVisual correctParent
= drawingAttributes.IsHighlighter ? GetContainerVisual(drawingAttributes) : _incrementalRenderingVisuals;
ContainerVisual currentParent
= VisualTreeHelper.GetParent(visual) as ContainerVisual;
if (currentParent == null || correctParent != currentParent)
{
return false;
}
return true;
}
///
/// TurnOnHighContrast turns on the HighContrast rendering mode
///
/// The stroke color under high contrast
internal void TurnHighContrastOn(Color strokeColor)
{
if ( !_highContrast || strokeColor != _highContrastColor )
{
_highContrast = true;
_highContrastColor = strokeColor;
UpdateStrokeVisuals();
}
}
///
/// ResetHighContrast turns off the HighContrast mode
///
internal void TurnHighContrastOff()
{
if ( _highContrast )
{
_highContrast = false;
UpdateStrokeVisuals();
}
}
///
/// Indicates whether the renderer is in high contrast mode.
///
///
/// returns the stroke color for the high contrast rendering.
///
///
/// StrokeCollectionChanged event handler
///
private void OnStrokesChanged(object sender, StrokeCollectionChangedEventArgs eventArgs)
{
System.Diagnostics.Debug.Assert(sender == _strokes);
// Read the args
StrokeCollection added = eventArgs.Added;
StrokeCollection removed = eventArgs.Removed;
// Add new strokes
foreach (Stroke stroke in added)
{
// Verify that it's not a dupe
if (_visuals.ContainsKey(stroke))
{
throw new System.ArgumentException(SR.Get(SRID.DuplicateStrokeAdded));
}
// Create a visual for the new stroke and add it to the dictionary
StrokeVisual visual = new StrokeVisual(stroke, this);
_visuals.Add(stroke, visual);
// Start listening on the stroke events
StartListeningOnStrokeEvents(visual.Stroke);
// Attach it to the visual tree
AttachVisual(visual, false/*buildingStrokeCollection*/);
}
// Deal with removed strokes first
foreach (Stroke stroke in removed)
{
// Verify that the event is in [....] with the view
StrokeVisual visual = null;
if (_visuals.TryGetValue(stroke, out visual))
{
// get rid of both the visual and the stroke
DetachVisual(visual);
StopListeningOnStrokeEvents(visual.Stroke);
_visuals.Remove(stroke);
}
else
{
throw new System.ArgumentException(SR.Get(SRID.UnknownStroke3));
}
}
}
///
/// Stroke Invalidated event handler
///
private void OnStrokeInvalidated(object sender, EventArgs eventArgs)
{
System.Diagnostics.Debug.Assert(_strokes.IndexOf(sender as Stroke) != -1);
// Find the visual associated with the changed stroke.
StrokeVisual visual;
Stroke stroke = (Stroke)sender;
if (_visuals.TryGetValue(stroke, out visual) == false)
{
throw new System.ArgumentException(SR.Get(SRID.UnknownStroke1));
}
// The original value of IsHighligher and Color are cached in StrokeVisual.
// if (IsHighlighter value changed or (IsHighlighter == true and not changed and color changed)
// detach and re-attach the corresponding visual;
// otherwise Invalidate the corresponding StrokeVisual
if (visual.CachedIsHighlighter != stroke.DrawingAttributes.IsHighlighter ||
(stroke.DrawingAttributes.IsHighlighter &&
StrokeRenderer.GetHighlighterColor(visual.CachedColor) != StrokeRenderer.GetHighlighterColor(stroke.DrawingAttributes.Color)))
{
// The change requires reparenting the visual in the tree.
DetachVisual(visual);
AttachVisual(visual, false/*buildingStrokeCollection*/);
// Update the cached values
visual.CachedIsHighlighter = stroke.DrawingAttributes.IsHighlighter;
visual.CachedColor = stroke.DrawingAttributes.Color;
}
// Update the visual.
visual.Update();
}
#endregion
#region Helper methods
///
/// Update the stroke visuals
///
private void UpdateStrokeVisuals()
{
foreach ( StrokeVisual strokeVisual in _visuals.Values )
{
strokeVisual.Update();
}
}
///
/// Attaches a stroke visual to the tree based on the stroke's
/// drawing attributes and/or its z-order (index in the collection).
///
private void AttachVisual(StrokeVisual visual, bool buildingStrokeCollection)
{
System.Diagnostics.Debug.Assert(_strokes != null);
if (visual.Stroke.DrawingAttributes.IsHighlighter)
{
// Find or create a container visual for highlighter strokes of the color
ContainerVisual parent = GetContainerVisual(visual.Stroke.DrawingAttributes);
Debug.Assert(visual is StrokeVisual);
//insert StrokeVisuals under any non-StrokeVisuals used for dynamic inking
int i = 0;
for (int j = parent.Children.Count - 1; j >= 0; j--)
{
if (parent.Children[j] is StrokeVisual)
{
i = j + 1;
break;
}
}
parent.Children.Insert(i, visual);
}
else
{
// For regular ink we have to respect the z-order of the strokes.
// The implementation below is not optimal in a generic case, but the
// most simple and should work ok in most common scenarios.
// Find the nearest non-highlighter stroke with a lower z-order
// and insert the new visual right next to the visual of that stroke.
StrokeVisual precedingVisual = null;
int i = 0;
if (buildingStrokeCollection)
{
Stroke visualStroke = visual.Stroke;
//we're building up a stroke collection, no need to start at IndexOf,
i = Math.Min(_visuals.Count, _strokes.Count); //not -1, we're about to decrement
while (--i >= 0)
{
if (object.ReferenceEquals(_strokes[i], visualStroke))
{
break;
}
}
}
else
{
i = _strokes.IndexOf(visual.Stroke);
}
while (--i >= 0)
{
Stroke stroke = _strokes[i];
if ((stroke.DrawingAttributes.IsHighlighter == false)
&& (_visuals.TryGetValue(stroke, out precedingVisual) == true)
&& (VisualTreeHelper.GetParent(precedingVisual) != null))
{
VisualCollection children = ((ContainerVisual)(VisualTreeHelper.GetParent(precedingVisual))).Children;
int index = children.IndexOf(precedingVisual);
children.Insert(index + 1, visual);
break;
}
}
// If found no non-highlighter strokes with a lower z-order, insert
// the stroke at the very bottom of the regular ink visual tree.
if (i < 0)
{
ContainerVisual parent = GetContainerVisual(visual.Stroke.DrawingAttributes);
parent.Children.Insert(0, visual);
}
}
}
///
/// Detaches a visual from the tree, also removes highligher parents if empty
/// when true is passed
///
private void DetachVisual(Visual visual)
{
ContainerVisual parent = (ContainerVisual)(VisualTreeHelper.GetParent(visual));
if (parent != null)
{
VisualCollection children = parent.Children;
children.Remove(visual);
// If the parent is a childless highlighter, detach it too.
HighlighterContainerVisual hcVisual = parent as HighlighterContainerVisual;
if (hcVisual != null &&
hcVisual.Children.Count == 0 &&
_highlighters != null &&
_highlighters.ContainsValue(hcVisual))
{
DetachVisual(hcVisual);
_highlighters.Remove(hcVisual.Color);
}
}
}
///
/// Attaches event handlers to stroke events
///
private void StartListeningOnStrokeEvents(Stroke stroke)
{
System.Diagnostics.Debug.Assert(stroke != null);
stroke.Invalidated += new EventHandler(OnStrokeInvalidated);
}
///
/// Detaches event handlers from stroke
///
private void StopListeningOnStrokeEvents(Stroke stroke)
{
System.Diagnostics.Debug.Assert(stroke != null);
stroke.Invalidated -= new EventHandler(OnStrokeInvalidated);
}
///
/// Finds a container for a new visual based on the drawing attributes
/// of the stroke rendered into that visual.
///
/// drawing attributes
/// visual
private ContainerVisual GetContainerVisual(DrawingAttributes drawingAttributes)
{
System.Diagnostics.Debug.Assert(drawingAttributes != null);
HighlighterContainerVisual hcVisual;
if (drawingAttributes.IsHighlighter)
{
// For a highlighter stroke, the color.A is neglected.
Color color = StrokeRenderer.GetHighlighterColor(drawingAttributes.Color);
if ((_highlighters == null) || (_highlighters.TryGetValue(color, out hcVisual) == false))
{
if (_highlighters == null)
{
_highlighters = new Dictionary();
}
hcVisual = new HighlighterContainerVisual(color);
hcVisual.Opacity = StrokeRenderer.HighlighterOpacity;
_highlightersRoot.Children.Add(hcVisual);
_highlighters.Add(color, hcVisual);
}
else if (VisualTreeHelper.GetParent(hcVisual) == null)
{
_highlightersRoot.Children.Add(hcVisual);
}
return hcVisual;
}
else
{
return _regularInkVisuals;
}
}
#endregion
#region Fields
// The renderer's top level container visuals
private ContainerVisual _rootVisual;
private ContainerVisual _highlightersRoot;
private ContainerVisual _incrementalRenderingVisuals;
private ContainerVisual _regularInkVisuals;
// Stroke-to-visual map
private Dictionary _visuals;
// Color-to-visual map for highlighter ink container visuals
private Dictionary _highlighters = null;
// Collection of strokes this Renderer renders
private StrokeCollection _strokes = null;
// List of visuals attached via AttachIncrementalRendering
private List _attachedVisuals = null;
// Whhen true, will render in high contrast mode
private bool _highContrast;
private Color _highContrastColor = Colors.White;
#endregion
}
}
// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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