internal void OnActivateDesigner(DesignSurface surface)
{
IDesignerHost item = null;
if (surface != null)
{
item = surface.GetService(typeof(IDesignerHost)) as IDesignerHost;
}
if ((item != null) && ((this._designerList == null) || !this._designerList.Contains(item)))
{
this.OnCreateDesigner(surface);
}
if (this._activeDesigner != item)
{
IDesignerHost provider = this._activeDesigner;
this._activeDesigner = item;
if (provider != null)
{
this.SinkChangeEvents(provider, false);
}
if (this._activeDesigner != null)
{
this.SinkChangeEvents(this._activeDesigner, true);
}
if (this._events != null)
{
ActiveDesignerEventHandler handler = this._events[EventActiveDesignerChanged] as ActiveDesignerEventHandler;
if (handler != null)
{
handler(this, new ActiveDesignerEventArgs(provider, item));
}
}
this.OnSelectionChanged(this, EventArgs.Empty);
}
}
/// <summary>
/// Extends BeginInvoke so that when a state object is not needed, null does not need to be passed.
/// <example>
/// activedesignereventhandler.BeginInvoke(sender, e, callback);
/// </example>
/// </summary>
public static IAsyncResult BeginInvoke(this ActiveDesignerEventHandler activedesignereventhandler, Object sender, ActiveDesignerEventArgs e, AsyncCallback callback)
{
if (activedesignereventhandler == null)
{
throw new ArgumentNullException("activedesignereventhandler");
}
return(activedesignereventhandler.BeginInvoke(sender, e, callback, null));
}
/// <include file='doc\DocumentManager.uex' path='docs/doc[@for="DocumentManager.OnActiveDesignerChanged"]/*' />
/// <devdoc>
/// Extending classes must call this when the active document changes.
/// </devdoc>
protected void OnActiveDesignerChanged(ActiveDesignerEventArgs e)
{
activeDesigner = e.NewDesigner;
ActiveDesignerEventHandler handler = (ActiveDesignerEventHandler)eventTable[DOCUMENT_CHANGED_EVENT];
if (handler != null)
{
handler.Invoke(this, e);
}
// Now update the selection events.
//
ISelectionService svc = null;
if (e.NewDesigner != null)
{
svc = (ISelectionService)e.NewDesigner.GetService(typeof(ISelectionService));
}
OnSelectionChanged(svc);
}
