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DockPanelWorkspace. Reactivation of smartpart: error

Printed From: IdeaBlade
Category: DevForce
Forum Name: DevForce Classic
Forum Discription: For .NET 2.0
URL: http://www.ideablade.com/forum/forum_posts.asp?TID=631
Printed Date: 11-Jun-2026 at 9:18am


Topic: DockPanelWorkspace. Reactivation of smartpart: error
Posted By: vecs
Subject: DockPanelWorkspace. Reactivation of smartpart: error
Date Posted: 25-Dec-2007 at 2:55am
Hello,

I have made new shell layout contained freeware DockPanelWorkspace from http://www.codeplex.com/cabext - http://www.codeplex.com/cabext as "ShellContent":
CAB%20dock%20workspace
But I am getting an exception when try to close and then reopen the same page.
It seems that View (SmartPart) were disposed and removed from its WorkItem when I closed tab. So when I try to activate this View (SmartPart) again the PageController can not find this View and raises exception ("Cannot access a disposed object. Object name: '...'."). Or sometimes SmartPart removed from Workspace and "The smartpart is not present in the workspace" error raised when try to activate View second time.
BTW I found the same problem with ModalWindowsWorkspace ("The smartpart is not present in the workspace" error) on reactivation.

Any suggestions how to solve this problem?

For now I suppose one solution for this:
Find the way to dispose PageController when its MainView closed in DockWorkspace or in ModalWindowsWorkspace. But I dont know how implement this.

For a while I have disabled tabs closing so that tab once appeared remain alive till the end of user session. But IMHO it is not rational..




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Replies:
Posted By: Bill Jensen
Date Posted: 28-Dec-2007 at 4:50pm
Well, you could try this:
 
In your PageController's static ShowPage() method, after calling the ShowPage<TController> base method, get the controller instance and setup a handler for the SmartPartClosing event of the main workspace:
 

// Get the controller instance

Page1PageController controller = GetPageController<Page1PageController>(pParentWorkItem, pPageWorkItemId);

// Handle the SmartPartClosing event (with an instance event handler)

controller.MainWorkspace.SmartPartClosing += new System.EventHandler<WorkspaceCancelEventArgs>(controller.MainWorkspace_SmartPartClosing);

Then add the handler:
 

// A SmartPart in the main workspace is closing

// Check to see if it's ours

private void MainWorkspace_SmartPartClosing(object sender, WorkspaceCancelEventArgs e)

{

// If it's our main view that's closing

if (e.SmartPart.Equals(this.MainView))

{

// Terminate this controlled workitem

// So a new controller will be created and initialized on the next Show() call

this.Terminate(e);

}

}

The Terminate(WorkspaceCancelEventArgs e) method is a a little bit tricky.  It sets the cancel flag in the event args to true.  If this isn't done, exceptions happen.

I've tried this briefly with a WindowWorkspace and it seems to work, but I'm not sure it will work with your DockPanelWorkspace.
 
Let me know if this helps.
 
Good luck,
Bill Jensen

Posted By: vecs
Date Posted: 29-Dec-2007 at 1:10am
Thank you very much, Bill!
It is exactly what we needed.
This work perfect with DockPanelWorkspace too.

But I found it does not work with "ModalWindows" workspace when I set this:
((WindowSmartPartInfo)MainView.SmartPartInfo).Modal = true;
The reason is that controller.MainWorkspace.SmartPartClosing event not fired after dialog closing.

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Posted By: DeLight
Date Posted: 10-Jan-2008 at 1:38am
as I remember, the problem is:
1. 
    public void Show() {
      ...
      MainWorkspace.Show(MainView);
      if ( IsFirstShow ) OnFirstShow();
      ...
    }

...


    private void OnFirstShow() {
      if ( IsFirstShow ) {
        IWorkspace editorWs = MainWorkspace;
        editorWs.SmartPartClosing += EditorClosingHandler;
        IsFirstShow = false;
      }
    }
in EntityEditorController.
2. MainWorkspace.Show(MainView) calls Form.ShowDialog() (in case of modal dialogs) so OnFirstShow() is not called until dialog window is closed. So editorWs.SmartPartClosing += EditorClosingHandler; is not called until dialog is closed. So SmartPartClosing event is not processed (not "not fired").
 
btw, solwed the "Reactivation of smartpart: error" problem with:
1. processing closing event in all pagecontrollers (not only editors).
mainWs.SmartPartClosing += PageClosingHandler;





protected void PageClosingHandler(object sender, WorkspaceCancelEventArgs e)


{


if (e.SmartPart != MainView)


return; // not this Editor


PageClosingHandlerCore(sender, e);


if (e.Cancel)


return;


Terminate(e);


}




protected virtual void PageClosingHandlerCore(object sender, WorkspaceCancelEventArgs e) { }
2. if we need the page to be hidden (not closed) when pushing the close button:
protected override void PageClosingHandlerCore(object sender, WorkspaceCancelEventArgs e)



{


((IWorkspace) sender).Hide(this.MainView);


e.Cancel = true;


}

щьёрт, не заметил Russian Federation. ко мне можно и по-русски. а лучше в аське сразу - 376440623 (рабочая), 108588 (домашняя). опыт работы с кабаной почти год уже, поделиться не против.


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