/// <summary>
/// Turns off auto-synchronize for the specified visualizer.
/// </summary>
/// <param name="visualizer"></param>
private static void EndAutoSynchronize(TagVisualizer visualizer)
{
Debug.Assert(visualizer != null);
Debug.Assert(visualizers.ContainsKey(visualizer), "Unknown visualizer");
Debug.Assert(visualizers[visualizer], "Auto-synchronize was already turned off");
Debug.Assert(autoSynchronizeCount > 0, "Auto-synchronize count is corrupt");
// Make sure that this is the visualizer's thread, to be sure
// to get the correct input manager
visualizer.VerifyAccess();
// Mark it as being un-tracked
--autoSynchronizeCount;
visualizers[visualizer] = false;
// If it's the last one, stop tracking
if (autoSynchronizeCount < 1)
{
InputManager.Current.HitTestInvalidatedAsync -= OnHitTestInvalidatedAsync;
}
}
/// <summary>
/// Turns on auto-synchronize for the specified visualizer.
/// </summary>
/// <param name="visualizer"></param>
private static void BeginAutoSynchronize(TagVisualizer visualizer)
{
Debug.Assert(visualizer != null);
Debug.Assert(visualizers.ContainsKey(visualizer), "Unknown visualizer");
Debug.Assert(!visualizers[visualizer], "Auto-synchronize was already turned on");
// Make sure that this is the visualizer's thread, to be sure
// to get the correct input manager
visualizer.VerifyAccess();
// Mark it as being tracked
++autoSynchronizeCount;
visualizers[visualizer] = true;
// If it's the first one, activate tracking
if (autoSynchronizeCount == 1)
{
InputManager.Current.HitTestInvalidatedAsync += OnHitTestInvalidatedAsync;
}
}