/// <summary>
/// Calling this will make sure that the render request
/// is registered with the MediaContext.
/// </summary>
private void RegisterForAsyncRenderForCyclicBrush()
{
DUCE.IResource resource = this as DUCE.IResource;
if (resource != null)
{
if ((Dispatcher != null) && !_isAsyncRenderRegistered)
{
MediaContext mediaContext = MediaContext.From(Dispatcher);
//
// Only register for a deferred render if this visual brush
// is actually on the channel.
//
if (!resource.GetHandle(mediaContext.Channel).IsNull)
{
// Add this handler to this event means that the handler will be
// called on the next UIThread render for this Dispatcher.
ICyclicBrush cyclicBrush = this as ICyclicBrush;
mediaContext.ResourcesUpdated += new MediaContext.ResourcesUpdatedHandler(cyclicBrush.RenderForCyclicBrush);
_isAsyncRenderRegistered = true;
}
}
}
}
public bool EnterTreeWalk(ICyclicBrush brush)
{
if (this._cyclicBrushes.ContainsKey(brush))
{
return(false);
}
this._cyclicBrushes.Add(brush, EmptyStruct.Default);
return(true);
}
/// <summary>
/// Override this function in derived classes to release unmanaged resources
/// during Dispose and during removal of a subtree.
/// </summary>
internal virtual void ReleaseOnChannelForCyclicBrush(
ICyclicBrush cyclicBrush,
DUCE.Channel channel)
{
// Update the number of times this visual brush uses this visual across all channels.
Dictionary<ICyclicBrush, int> cyclicBrushToChannelsMap =
CyclicBrushToChannelsMapField.GetValue(this);
Debug.Assert(cyclicBrushToChannelsMap != null);
Debug.Assert(cyclicBrushToChannelsMap.ContainsKey(cyclicBrush));
Debug.Assert(cyclicBrushToChannelsMap[cyclicBrush] > 0);
if (cyclicBrushToChannelsMap[cyclicBrush] == 1)
{
//
// If the ICyclicBrush no longer uses this Visual across all channels, then
// we can remove it from the map.
//
cyclicBrushToChannelsMap.Remove(cyclicBrush);
}
else
{
// Decrease the number os times this ICyclicBrush uses this Visual across all channels
cyclicBrushToChannelsMap[cyclicBrush] =
cyclicBrushToChannelsMap[cyclicBrush] - 1;
}
// Decrease the number of ICyclicBrush using the visual as root on this channel
Dictionary<DUCE.Channel, int> channelsToCyclicBrushMap =
ChannelsToCyclicBrushMapField.GetValue(this);
Debug.Assert(channelsToCyclicBrushMap != null);
Debug.Assert(channelsToCyclicBrushMap.ContainsKey(channel));
Debug.Assert(channelsToCyclicBrushMap[channel] > 0);
channelsToCyclicBrushMap[channel] =
channelsToCyclicBrushMap[channel] - 1;
//
// If on this channel, there are no more ICyclicBrushes using this visual as
// a root then we need to remove the flag saying that the visual is a visual
// brush root and make sure that the dependant resources are released in
// case we are no longer connected to the visual tree.
//
if (channelsToCyclicBrushMap[channel] == 0)
{
channelsToCyclicBrushMap.Remove(channel);
SetFlags(false, VisualFlags.NodeIsCyclicBrushRoot);
PropagateFlags(
this,
VisualFlags.None,
VisualProxyFlags.IsSubtreeDirtyForRender);
//
// If we do not have a parent or we have already disconnected from
// the parent and we are also not the root then we need to clear out
// the tree.
//
if ( (_parent == null
|| !CheckFlagsAnd(channel, VisualProxyFlags.IsConnectedToParent))
&& !IsRootElement)
{
((DUCE.IResource)this).ReleaseOnChannel(channel);
}
}
}
internal virtual void AddRefOnChannelForCyclicBrush(
ICyclicBrush cyclicBrush,
DUCE.Channel channel)
{
//
// Since the ICyclicBrush to visual relationship is being created on this channel,
// we need to update the number of cyclic brushes using this visual on this channel.
//
Dictionary<DUCE.Channel, int> channelsToCyclicBrushMap =
ChannelsToCyclicBrushMapField.GetValue(this);
if (channelsToCyclicBrushMap == null)
{
channelsToCyclicBrushMap = new Dictionary<DUCE.Channel, int>();
ChannelsToCyclicBrushMapField.SetValue(this, channelsToCyclicBrushMap);
}
if (!channelsToCyclicBrushMap.ContainsKey(channel))
{
// If on this channel we were not previously using this Visual as the root
// node of a VisualBrush, set the flag indicating that it is the root now.
// Also set the number of uses on this channel to 1.
SetFlags(true, VisualFlags.NodeIsCyclicBrushRoot);
channelsToCyclicBrushMap[channel] = 1;
}
else
{
Debug.Assert(channelsToCyclicBrushMap[channel] > 0);
channelsToCyclicBrushMap[channel] += 1;
}
//
// Since the ICyclicBrush to visual relationship is being created on this channel,
// we need to update the number of times this cyclic brush is used across all
// channels.
//
Dictionary<ICyclicBrush, int> cyclicBrushToChannelsMap =
CyclicBrushToChannelsMapField.GetValue(this);
if (cyclicBrushToChannelsMap == null)
{
cyclicBrushToChannelsMap = new Dictionary<ICyclicBrush, int>();
CyclicBrushToChannelsMapField.SetValue(this, cyclicBrushToChannelsMap);
}
if (!cyclicBrushToChannelsMap.ContainsKey(cyclicBrush))
{
cyclicBrushToChannelsMap[cyclicBrush] = 1;
}
else
{
Debug.Assert(cyclicBrushToChannelsMap[cyclicBrush] > 0);
cyclicBrushToChannelsMap[cyclicBrush] += 1;
}
//
// Render the brush's visual.
//
cyclicBrush.RenderForCyclicBrush(channel, false);
}
public bool IsTreeWalkInProgress(ICyclicBrush brush)
{
return(this._cyclicBrushes.ContainsKey(brush));
}
public void ExitTreeWalk(ICyclicBrush brush)
{
this._cyclicBrushes.Remove(brush);
}
