/// <summary>
/// Fired when the current document changes.
/// </summary>
/// <param name="oldView">Previous DocData</param>
/// <param name="newView">Current DocData</param>
protected override void OnDocumentWindowChanged(ModelingDocView oldView, ModelingDocView newView)
{
var newModelingData = newView != null ? newView.DocData : null;
if (newModelingData != null &&
IsDocumentSupported(newModelingData))
{
var store = newModelingData.Store;
if (store != null)
{
if (_currentDocData != null)
{
// if we're switching stores, make sure we clear the tree. Prevents store disposed exceptions if
// the currentDocData.Store is disposed before we switch back to it.
if (newModelingData.Store != _currentDocData.Store)
{
// clear tree data, causes event handlers to be removed from our branches.
if (_treeProvider != null)
{
_treeProvider.Root = null;
}
// clear cached selection
_currentSelection = null;
_currentBrowseObject = null;
}
// disable column event handlers
_treeControl.RemoveColumnEventHandlers();
// unsubscribe from document closing event
_currentDocData.DocumentClosing -= OnDocumentClosing;
}
// enable column event handlers
_treeControl.AddColumnEventHandlers();
// subscribe to document closing event
newModelingData.DocumentClosing += OnDocumentClosing;
// cache the doc data, so we can unsubscribe properly. We cannot
// unsubscribe using oldView.DocData, because we may get an OnDocumentWindowChanged(oldModelingData, null)
// just prior to a document close. In that case, we'd unsubscribe too early, and not clean up properly
// in OnDocumentClosed. Instead we wait until either we get a new supported document, or the old one closes.
_currentDocData = newModelingData;
}
}
else
{
// it's possible that the oldView is not some docData we support, in that case, don't do anything
var oldModelingData = oldView != null ? oldView.DocData : null;
if (oldModelingData != null &&
IsDocumentSupported(oldModelingData))
{
// Null or unsupported view, clear our selection context. Note that we leave the tree populated
// here so that in the common case of switching back and forth between designer and code, we
// don't lose selection/expansion state in the tree. We also clear/save the selection context,
// because we don't want to push anything to the property browser while the watermark is showing.
_currentBrowseObject = PrimarySelection;
SetSelectedComponents(new object[] { });
if (_containerControl != null)
{
_containerControl.WatermarkVisible = true;
}
}
}
}
