I have a VSPackage
with a dockable tool window containing form data. If there are unsaved changes in this form, I would like to cancel a close to either the tool window and the visual studio IDE if the user clicks cancel on saving changes before closing. I can perform the save test on close, but I don't see any event handler methods or other options to actually cancel the close.
Here is some blurb from the package:
private DTE2 _applicationObject = null;
///--------------------------------------------------------------------------------
/// <summary>This property gets the visual studio IDE application object.</summary>
///--------------------------------------------------------------------------------
public DTE2 ApplicationObject
{
get
{
if (_applicationObject == null)
{
// Get an instance of the currently running Visual Studio IDE
DTE dte = (DTE)GetService(typeof(DTE));
_applicationObject = dte as DTE2;
}
return _applicationObject;
}
}
///--------------------------------------------------------------------------------
/// <summary>
/// Initialization of the package; this method is called right after the package is sited, so this is the place
/// where you can put all the initilaization code that rely on services provided by VisualStudio.
/// </summary>
///--------------------------------------------------------------------------------
protected override void Initialize()
{
Trace.WriteLine(string.Format(CultureInfo.CurrentCulture, "Entering Initialize() of: {0}", this.ToString()));
base.Initialize();
// add the event handlers
if (ApplicationObject != null)
{
// wire up window events
PackageWindowEvents = (WindowEvents)ApplicationObject.Events.get_WindowEvents(null);
PackageWindowEvents.WindowClosing += new _dispWindowEvents_WindowClosingEventHandler(PackageWindowEvents_WindowClosing);
// wire up solution events
PackageSolutionEvents = ApplicationObject.Events.SolutionEvents;
PackageSolutionEvents.Opened += new _dispSolutionEvents_OpenedEventHandler(CheckOpenCurrentSolution);
// wire up DTE events
PackageDTEEvents = ApplicationObject.Events.DTEEvents;
PackageDTEEvents.OnBeginShutdown += new _dispDTEEvents_OnBeginShutdownEventHandler(HandleVisualStudioShutdown);
}
}
void PackageWindowEvents_WindowClosing(Window window)
{
// handle save/cancel scenarios
}
And some blurb from the ToolWindowPane
that implements IVsWindowFrameNotify3
:
protected override void OnClose()
{
base.OnClose();
}
public int OnClose(ref uint pgrfSaveOptions)
{
return (int)__FRAMECLOSE.FRAMECLOSE_PromptSave;
}
The OnClose
and WindowClosing
methods fire when expected, but I'm not finding a way to cancel the close. What am I missing? Are there different events required to cancel a close?