Need Help Dragging Window

[Mtlca401]

I have a bitmap loaded as the parent window because I am working on skinning a program. Well I am trying to drag the window with the mouse by clicking anywhere on it; eventually I'll put a caption bar on it, but for now I am just dragging from clicking on the window. The problem I am having is that as I am dragging the window, if I drag to fast then the mouse loses the window. I tried using setcapture() on WM_MOUSEMOVE, but that didn't work because it messes with the controls making me have to click a button 3 times before it is actually pressed. I also tried using releasecapture() WM_LBUTTONUP, but that didn't work either.

I can post my code or maybe someone can just tell me how to drag a window.

thanx

 

[timmay3141]

You should be using SetCapture on WM_LBUTTONDOWN, not WM_MOUSEMOVE. Then use ReleaseCapture on WM_LBUTTONUP and everything should work.

 

[Mtlca401]

actually I did try that and it didn't work. Is there any type of skinning tutorial? No MFC and no VC++. I want to see if I am doing any thing wrong.

 

[timmay3141]

Well, you are doing something wrong. Here is the code to do what you are trying to accomplish; I tested it and it works.

#include <windows.h>
#include "resource.h"

POINT LParamToPoint(LPARAM lParam)
{
	POINT pt;
	pt.x = LOWORD(lParam);
	pt.y = HIWORD(lParam);
	return pt;
}

INT CALLBACK WindowProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)
{
	static POINT ptOffset;
	static bool bLButtonDown = false;

	switch(msg)
	{
	case WM_CLOSE:
		PostQuitMessage(0);
		break;

	case WM_LBUTTONDOWN:
		bLButtonDown = true;
		ptOffset = LParamToPoint(lParam);
		SetCapture(hwnd);
		break;

	case WM_LBUTTONUP:
		bLButtonDown = false;
		ReleaseCapture();
		break;

	case WM_MOUSEMOVE:
		if(bLButtonDown)
		{
			RECT rc;
			POINT pt = LParamToPoint(lParam);
			GetWindowRect(hwnd, &rc);

			pt.x += rc.left - ptOffset.x;
			pt.y += rc.top - ptOffset.y;

			SetWindowPos(hwnd, NULL, pt.x, pt.y, 0, 0, SWP_NOSIZE | SWP_NOZORDER);
		}
		break;
	}

	return 0;
}

int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow)
{
	DialogBox(hInstance, MAKEINTRESOURCE(IDD_DIALOG1), NULL, WindowProc);

	return 0;
}

 

[mseth]

Here is a much easier method to do what timmay3141 said:

case WM_LBUTTONDOWN:
SendMessage(hWnd,WM_NCLBUTTONDOWN,HTCAPTION,0); //this is to move the form
break;

 

[mseth]

That code came from source at

http://www.planetcpp.com/

(to give credit where it's due).

 

[chipperMDW]

Some badly drawn ASCII art depicting what I thought when I read the topic title:

      HELP!
   ___  '
  |_|_|__O/       O    O
  |_|_| /,       '|`  '|`

Sorry... was bored couldn't resist.