/// <param name="needDetach">whether remove current context from render buffer</param>
private async Task _UpdateAsync(GLVisual visual, bool needDetach = false)
{
if (visual.TryEnterUpdate())
{
if (needDetach)
{
_DetachVisual(visual); // remove current context from render buffer but not clear itself (for hittest)
}
await visual.UpdateAsync(); // context has been swapped
visual.BackContext?.Clear(); // so we clear back context
// has been deleted when updating ?
if (!visual.IsDeleted) // not deleted
{
_AttachVisual(visual); // add current context to render buffer
if (!visual.TryExitUpdate())
{
await _UpdateAsync(visual, true);
}
}
else // has been deleted
{
visual.Reset(); // reset visual
visual.Panel = null; // disconnect from panel
visual.ExitUpdate(); // endup updating !!!!!
if (visual.NeedDispose)
{
visual.Dispose();
}
}
}
}
/// <summary>
/// Remove a visual
/// </summary>
/// <param name="visual">The visual to remove</param>
/// <param name="refresh">Whether to refresh the frame buffer immediately</param>
public void RemoveVisual(GLVisual visual, bool refresh = true)
{
MakeSureCurrentContext(_context);
if (visual.Panel != this)
{
throw new InvalidOperationException("Logical parent error!");
}
_DetachVisual(visual);
_RemoveVisual(visual);
if (!visual.IsUpdating)
{
visual.Reset();
visual.Panel = null;
}
if (refresh)
{
_Refresh();
}
}
