/// <summary>
/// Called by derived classes to indicate that selection has changed. Implements selection logic based
/// on attributes placed on selected objects.
/// </summary>
/// <returns>true if selection changed</returns>
protected bool DoSelectionChanged(object selection, bool force)
{
if (_containerControl == null)
{
Debug.Fail("OperationDesignerWindow must be initialized before DoSelectionChanged can be called");
return(false); // we haven't been initialized yet
}
if (!force &&
_currentSelection != null &&
_currentSelection == selection)
{
_containerControl.WatermarkVisible = false;
if (_currentBrowseObject != null)
{
try
{
// Reset selection context. We clear this on document window switches.
SetSelectedComponents(new[] { _currentBrowseObject });
}
finally
{
_currentBrowseObject = null;
}
}
// nothing changed
return(false);
}
if (_treeControl.PopulateTree(selection))
{
// hide watermark
if (_containerControl.WatermarkVisible)
{
_containerControl.WatermarkVisible = false;
}
// cache selection
_currentSelection = selection;
return(true);
}
else
{
// otherwise set watermark for unrecognized selection
_containerControl.SetWatermarkInfo(WatermarkInfo);
// we weren't previously showing the watermark, so treat this as
// a selection change.
if (!_containerControl.WatermarkVisible)
{
_containerControl.WatermarkVisible = true;
SetSelectedComponents(new object[] { }); // clear our selection context when displaying the watermark.
_currentSelection = null;
return(true);
}
return(false);
}
}
