Window title bar - detecting drag end

[Anonymous]

Hi, I have an over-ridden handler CMyDialog::OnNcLButtonDown() which detects if the user selects the title bar of my dialog. The user then drags the dialog and releases the mouse button. How can my program know when the mouse button has been released? I have tried over-riding the CMyDialog::OnNcLButtonDown() function but it does not work.

[Anonymous]

Anonymous wrote: I have tried over-riding the CMyDialog::OnNcLButtonDown() function but it does not work. Sorry. I mean to say the CMyDialog::OnNcLButtonUp() function

[Yawar Maajed]

try overloading WM_NCHITTESTmessage, the code will look something like this UINT YourClass::OnNcHitTest(CPoint point) { int ret = YourParentCwndBasedClass::OnNcHitTest(point); if (ret == HTCAPTION) { if (GetAsyncKeyState(VK_LBUTTON) < 0) { if (!mbLButtonDown) { TRACE("\nDown"); mbLButtonDown = true; } } else { if (mbLButtonDown) { TRACE("\nUp"); mbLButtonDown = false; } } } return ret; } where mbLButtonDown would be a bool member of your class and would need to be initialized as false when constructing your window. There might be some other way to do this too, this was just a quick thing that came to my mind. HTH, /yawar

[Yawar Maajed]

I said "try overloading".. that was not right, I meant "try writing message handler for"... :):):):)

[RaviBee]

Another way to detect the end of a move by dragging the caption bar is to simply handle WM_MOVE and check if the mouse is over the window's caption bar. You can do this by calling GetCursorPos() and checking if the point lies within the caption bar. GetWindowRect() and GetSystemMetrics() can help you in your computation. /ravi My new year's resolution: 2048 x 1536 Home | Articles | Freeware | Music ravib@ravib.com