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VB Forum / Win API / May 2008Hooking WM_NCHITTEST or Usercontrol does not affect Left and Top
Hello I am having a few issues when hooking WM_NCHITTEST in VB6 then reading the new values given to Left and Top of a Usercontrol. My Windows hook returns HTCAPTION for WM_NCHITTEST when the user clicks on the Usercontrol. This has the affect of moving the Usercontrol like dragging a form border. The hook works correctly and the Usercontrol visually moves on the form, but the values in Left and Top for the Usercontrol on the parent form never changes. Its as if VB6 is never being informed that the Usercontrol has moved. The same is true for Usercontrol.Extender.Left/ Top. Any suggestions? Thanks Paul Also, here's a similar example of what I am doing, but my hook is on a Usercontrol not a form. http://vbnet.mvps.org/index.html?code/forms/scrollviewport.htm Paul > Hello > [quoted text clipped - 16 lines] > > Paul Also, here's a similar example of what I'm doing, but my hook is on a Usercontrol not a Form. http://vbnet.mvps.org/index.html?code/subclass/htcaption.htm Paul > Hello > [quoted text clipped - 16 lines] > > Paul > The hook works correctly and the Usercontrol visually moves on the > form, but the values in Left and Top for the Usercontrol on the parent > form never changes. Its as if VB6 is never being informed that the > Usercontrol has moved. That actually makes sense. Same thing happens if you manually sort a ListView. VB is keeping all these internal tables, and they're not actually truth-checked more often than not. May be that you have to live with this.  Signature.NET: It's About Trust! http://vfred.mvps.org > Hello > [quoted text clipped - 10 lines] > Usercontrol has moved. The same is true for Usercontrol.Extender.Left/ > Top. User control hosting and placement does not use the standard window positioning. When the control is moved, it changes the windowrect, but not the other way around. If I want a UC to move itself, I had to manually handle mousedown/move and chenge the extender top and left. SignatureDean Earley (dean.earley@icode.co.uk) i-Catcher Development Team iCode Systems My soultion was to use GetWindowRect to get the position of the Form and the Usercontrol. Its not perfect, but I only need to know a relative position so it works for my requirements. Paul > kerplunkwho...@yahoo.co.uk wrote: > > Hello [quoted text clipped - 25 lines] > > iCode Systems Try searching the newsgroup for "vb drag UserControl" to see if there are alternatives. |
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