/// <summary>
/// Finds a container for a new visual based on the drawing attributes
/// of the stroke rendered into that visual.
/// </summary>
/// <param name="drawingAttributes">drawing attributes</param>
/// <returns>visual</returns>
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 <Color, HighlighterContainerVisual>();
}
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);
}
}
/// <summary>
/// Detaches a visual from the tree, also removes highligher parents if empty
/// when true is passed
/// </summary>
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);
}
}
}
/// <summary>
/// Finds a container for a new visual based on the drawing attributes
/// of the stroke rendered into that visual.
/// </summary>
/// <param name="drawingAttributes">drawing attributes</param>
/// <returns>visual</returns>
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<Color, HighlighterContainerVisual>();
}
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;
}
}