XTP_DPN_SHOWWINDOW behavior changed in v13

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   The behavior might be the same in v12, but I encountered it in v13.
Let me clarify.
XTP_DPN_SHOWWINDOW is not sent when the the pane's rectangle is empty (IsRectEmpty). This should be documented as it could lead to strange behavior:

1) The user changes the size of a pane to zero-height and closes the application.
2) Pane is saved to the Registry.
3) Application is opened and the pane read from the Registry.
4) Since the child-window is created and attached in OnDockingPaneNotify(), the child will not be created until the pane is explicitly resized!

Perhaps create/attach should always be made in OnCreate() instead of OnDockingPaneNotify()?

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znakeeye Members Profile Send Private Message Find Members Posts Add to Buddy List Senior Member Joined: 26 July 2006 Status: Offline Points: 1672	Post Options Post Reply Quote znakeeye Report Post Thanks(0) Quote Reply Topic: XTP_DPN_SHOWWINDOW behavior changed in v13 Posted: 11 February 2009 at 4:58am
	The behavior might be the same in v12, but I encountered it in v13. Let me clarify. XTP_DPN_SHOWWINDOW is not sent when the the pane's rectangle is empty (IsRectEmpty). This should be documented as it could lead to strange behavior: 1) The user changes the size of a pane to zero-height and closes the application. 2) Pane is saved to the Registry. 3) Application is opened and the pane read from the Registry. 4) Since the child-window is created and attached in OnDockingPaneNotify(), the child will not be created until the pane is explicitly resized! Perhaps create/attach should always be made in OnCreate() instead of OnDockingPaneNotify()?
	PokerMemento - http://www.pokermemento.com/

Oleg Members Profile Send Private Message Find Members Posts Add to Buddy List Admin Group Joined: 21 May 2003 Location: United States Status: Offline Points: 11234	Post Options Post Reply Quote Oleg Report Post Thanks(0) Quote Reply Posted: 11 February 2009 at 4:45am
	Hi, I compared sources with 12.1.1 - nothing that can change this behavior. XTP_DPN_SHOWWINDOW called when pane become visible. You can add method that attach panes and call it from CMainFrame::Create and from NotifyHandler.
	Oleg, Support Team CODEJOCK SOFTWARE SOLUTIONS

znakeeye Members Profile Send Private Message Find Members Posts Add to Buddy List Senior Member Joined: 26 July 2006 Status: Offline Points: 1672	Post Options Post Reply Quote znakeeye Report Post Thanks(0) Quote Reply Posted: 10 February 2009 at 3:55pm
	You check for empty rectangles in the ShowWindow() call. Can you please tell me how to make certain pane-children attached explicitly? When I call GetChild() from my other pane-manager, the child window must already be set!
	PokerMemento - http://www.pokermemento.com/

znakeeye Members Profile Send Private Message Find Members Posts Add to Buddy List Senior Member Joined: 26 July 2006 Status: Offline Points: 1672	Post Options Post Reply Quote znakeeye Report Post Thanks(0) Quote Reply Posted: 10 February 2009 at 3:43pm
	Upgraded to v13.0.0 from v12.1.1. pMainPane = GetMainFrame().GetPaneManager().FindPane(IDR_EXISTING_PANE); CWnd* pWndChild = pMainPane->GetChild(); // Returns NULL when pane has not been sized (zero-height in this case)! It seems XTP_DPN_SHOWWINDOW is not sent when the pane has zero-height. Is this by design? Anyway, such changes should be thoroughly documented!
	PokerMemento - http://www.pokermemento.com/