public void RemoveLayer(SlideViewLayer layer)
{
Debug.Assert(layer != null);
if (!this.myLayers.Contains(layer))
{
throw new ArgumentException("this object does not contain the given layer", "layer");
}
int index = this.myLayers.IndexOf(layer);
layer.Invalidated -= new SlideViewer.RegionEventHandler(this.HandleInvalidatedLayer);
this.myLayers.RemoveAt(index);
if (this.myLayerDirtyRegions[index] != null)
{
((System.Drawing.Region) this.myLayerDirtyRegions[index]).Dispose();
}
this.myLayerDirtyRegions.RemoveAt(index);
layer.Detach();
// Redraw everything since we expect remove events to be rare, anyway.
this.MarkForFullRedraw();
this.myLayerPanel.Invalidate();
if (this.LayerRemoved != null)
{
this.LayerRemoved(this, EventArgs.Empty);
}
}
/// <remarks>Disposes of layers as it removes them (unlike RemoveLayer)</remarks>
public void ClearLayers()
{
while (this.LayerCount > 0)
{
SlideViewLayer layer = this.GetLayer(0);
this.RemoveLayer(0);
layer.Dispose();
}
}
protected virtual void HandleInvalidatedLayer(object sender, SlideViewer.RegionEventArgs args)
{
SlideViewLayer layer = (SlideViewLayer)sender;
int index = this.myLayers.IndexOf(layer);
Debug.Assert(index >= 0 && index < this.myLayerDirtyRegions.Count);
Debug.Assert(this.myLayerDirtyRegions.Count == this.myLayers.Count);
if (this.myLayerDirtyRegions[index] == null)
{
this.myLayerDirtyRegions[index] = new Region();
}
try {
((System.Drawing.Region) this.myLayerDirtyRegions[index]).Union(args.Region);
}
catch (Exception ex) {
Debug.WriteLine(ex.ToString());
}
}
public void AddLayer(SlideViewLayer layer)
{
if (layer == null)
{
throw new ArgumentNullException("layer", "layer may not be null");
}
this.myLayers.Add(layer);
this.myLayerDirtyRegions.Add(new Region(new RectangleF(0, 0, 1, 1)));
// Redraw everything since we expect add events to be rare, anyway.
this.MarkForFullRedraw();
this.myLayerPanel.Invalidate();
layer.Attach(this);
layer.Invalidated += new SlideViewer.RegionEventHandler(this.HandleInvalidatedLayer);
if (this.LayerAdded != null)
{
this.LayerAdded(this, EventArgs.Empty);
}
}
public bool HasLayer(SlideViewLayer layer)
{
return(this.myLayers.Contains(layer));
}
