/// <summary>
/// StrokeCollectionChanged event handler
/// </summary>
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 sync 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));
}
}
}
/// <summary>
/// Attaches a stroke visual to the tree based on the stroke's
/// drawing attributes and/or its z-order (index in the collection).
/// </summary>
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);
}
}
}
/// <summary>
/// Attaches a stroke visual to the tree based on the stroke's
/// drawing attributes and/or its z-order (index in the collection).
/// </summary>
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);
}
}
}
/// <summary>
/// StrokeCollectionChanged event handler
/// </summary>
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));
}
}
}
