[Mono-bugs] [Bug 349922] New: After Drag & Drop no controls can be clicked

bugzilla_noreply at novell.com bugzilla_noreply at novell.com
Wed Dec 19 16:57:20 EST 2007


           Summary: After Drag & Drop no controls can be clicked
           Product: Mono: Class Libraries
           Version: unspecified
          Platform: Other
        OS/Version: Other
            Status: NEW
          Severity: Normal
          Priority: P5 - None
         Component: Windows.Forms
        AssignedTo: mono-bugs at ximian.com
        ReportedBy: gnorton at novell.com
         QAContact: mono-bugs at ximian.com
          Found By: ---

Download sharpchess (www.sharpchess.com) and drag & drop a piece.  Afterwords
no controls can be clicked.

It appears that what is happening is the following:

When the StartDrag call returns SharpChess attempts to redraw the board with
the new piece position.
This calls PictureBox.set_BorderStyle from frmMain.RenderBoard ().
Which in turn causes Control to call RecreateHandle (eventually).
However the next event in the pipeline beofre the handle is created is the
WM_LBUTTONUP, but since the handle has been destroyed the window->hwnd mapping
in NativeWindow.cs (window_collection) cannot find the control to direct the
message to.

In turn the WM_LBUTTONUP never gets to the Control which never unsets
InternalCapture which never releases the Grab on the window.

Ping me if thats not clear enough


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