moving a window without using the title bar

markiv · #1 22-Aug-2005, 06:22

hello...

I want the user to be able to move my application's window by clicking anywhere on the window area and draggin it around....

here is the code i'm currently usin in my main window procedure:

CPP / C++ / C Code:

	               
case WM_LBUTTONDOWN:
       GetWindowRect(hWnd, &MainRect);
      
      //save current cursor coordinate
      GetCursorPos(&point);
     
      ScreenToClient(hWnd, &point);
      break;

case WM_MOUSEMOVE :
     
      GetCursorPos(&curpoint);
      if(wParam==MK_LBUTTON)
      {     
            MoveWindow(hWnd, curpoint.x - point.x, curpoint.y - point.y, 
            MainRect.right - MainRect.left, MainRect.bottom - MainRect.top,  
            TRUE);
      }
      break;

(hWnd is the main window, curpoint and point are POINT variables)

now this works, but not very well. If the mouse is moved around too fast while draggin the window gets stuck.... same thing happens if some part of the window is moved outside the viewable area of the screen...

Is there a better way to do this?

Liox · #2 07-Jun-2006, 13:50

Hay, the window starts freezing becouse as you move the mouse faster the mouse moves off the window and the move mouse message no longer gets sent to your windows window procedure, to fix this u can use the SetCapture(hWnd); command which tells the program tht no matter where the mouse is it only works for your window add this under the case WM_LBUTTONDOWN, also dont forget to add case WM_LBUTTONUP with ReleaseCapture(); in it becouse other wize the mouse wont work out side ur window once u release the button. to ellaborate

CPP / C++ / C Code:

	               
case WM_LBUTTONDOWN:
       SetCapture( hWnd );
       GetWindowRect(hWnd, &MainRect);
      
      //save current cursor coordinate
      GetCursorPos(&point);
     
      ScreenToClient(hWnd, &point);
      break;

case WM_MOUSEMOVE :
     
      GetCursorPos(&curpoint);
      if(wParam==MK_LBUTTON)
      {     
            MoveWindow(hWnd, curpoint.x - point.x, curpoint.y - point.y, 
            MainRect.right - MainRect.left, MainRect.bottom - MainRect.top,  
            TRUE);
      }
      break;

case WM_LBUTTONUP:
       ReleaseCapture();
break;

sowi if this is abit confusing i have alwayz been bad at explaining stuff

hope it helps

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moving a window without using the title bar

Re: moving a window without using the title bar