[RESOLVED] My Child Window (a splitter window) does not process mouse notification

[Irwan]

Hi,



I'm having problem. I have reduce the code to simplify the question.

In this code, I have create 3 child windows (or I refered as panel) to the the parent window (hwnd) in Client Area.



The App Handle = hInstance

The Main/Parent Window = hwnd

The Child Window to hwnd = hwndMsgPanel, hwndLeftPanel, hwndSplitterPanel



The problem:

1. I try to process WM_MOUSEMOVE in WndProc (for hwnd).

2. Whenever Cursor is x>0 in client area, it should change to IDC_SIZEWE.

3. Because x>0 is mean all the client area, so the cursor should change IDC_SIZEWE whenever it in client.

4. But it is not in case of my app. The cursor only change when it is in client area but not ontop of all the child window area (area which is sepcify to hwndMsgPanel, hwndLeftPanel, hwndSplitterPanel).

5. I suspect that, WndProc (for hwnd) do not process the message send to its child window (because hwndMsgPanel, hwndLeftPanel, hwndSplitterPanel is the child window to hwnd).

6. I test process the WM_MOUSEMOVE in the one of the child window, let say LeftPanelProc (wndProc for hwndLeftWnd). Now the cursor change to IDC_SIZEWE whenever the cursor ontop the hwndLeftPanel area. (The code is not show below as this is not the question).

7. But I suppose the message send to hwnd, and hwnd should able to handle its child right?

8. Moreover, the code in http://www.win32apicode.com/splitter.php is able to do it.



Why my app hwnd can't process mouse in its child window?



Thanks, I think this question will be easy for the you guys, the master.

#include  <windows.h>			// For Win32 API





// API Function Prototype
LRESULT CALLBACK WndProc(HWND hwnd, UINT iMsg, WPARAM wParam, LPARAM lParam);
LRESULT CALLBACK LeftPanelProc(HWND hwnd, UINT iMsg, WPARAM wParam, LPARAM lParam);
LRESULT CALLBACK SplitterPanelProc(HWND hwnd, UINT iMsg, WPARAM wParam, LPARAM lParam);
LRESULT CALLBACK MsgPanelProc(HWND hwnd, UINT iMsg, WPARAM wParam, LPARAM lParam);






int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, PSTR szCmdLine, int iCmdShow)
{
	// Win32 API Structure Declaration
	HWND			hwnd;
	MSG			msg;
	WNDCLASS		wndclass;
	static TCHAR	    szAppName[] = TEXT("SplitterApp");
	HBRUSH			bgBrushA, bgBrushB, bgBrushC, bgBrushD;	

	
	// Main Window Class
	wndclass.style     = 0;
	wndclass.lpfnWndProc  = WndProc;
	wndclass.cbClsExtra  = 0;
	wndclass.cbWndExtra  = 0;
	wndclass.hInstance   = hInstance;
	wndclass.hIcon     = LoadIcon(hInstance, szAppName);
	wndclass.hCursor    = LoadCursor(NULL, IDC_ARROW);
	wndclass.hbrBackground = bgBrushA = CreateSolidBrush(RGB(195,218,249));		// This is same with FrameBase.BgColor Property
	wndclass.lpszMenuName = 0;
	wndclass.lpszClassName = szAppName;
	RegisterClass(&wndclass);


	// Left Panel Class
	wndclass.lpfnWndProc	= LeftPanelProc;
	wndclass.hbrBackground	= bgBrushB = CreateSolidBrush(RGB(255,255,255));		// This is same with LeftPanel.BgColor Property
	wndclass.lpszClassName	= TEXT("LeftPanel");
	RegisterClass(&wndclass);

	

	// Splitter Panel Class (divider between Left Panel & Work Panel)
	wndclass.lpfnWndProc	= SplitterPanelProc;
	wndclass.hbrBackground	= bgBrushC = CreateSolidBrush(RGB(255,0,0));		// This is same with SplitterPanel.BgColor Property
	wndclass.lpszClassName	= TEXT("SplitterPanel");
	RegisterClass(&wndclass);

	
	
	// Msg Panel Class
	wndclass.lpfnWndProc	= MsgPanelProc;
	wndclass.hbrBackground	= bgBrushD = CreateSolidBrush(RGB(255,255,0));		// This is same with LeftPanel.BgColor Property
	wndclass.lpszClassName	= TEXT("MsgPanel");
	RegisterClass(&wndclass);
	


	// Create Window for Main Window	
	hwnd = CreateWindow(  szAppName, 
				szAppName, 
				WS_OVERLAPPEDWINDOW | SW_MAXIMIZE | WS_VISIBLE,
				CW_USEDEFAULT, 
				CW_USEDEFAULT, 
				900, 
				500, 
				NULL, 
				NULL, 
				hInstance, 
				szCmdLine);



	// Message Pump 
	while (GetMessage(&msg, NULL, 0, 0))
	{
		TranslateMessage(&msg);
		DispatchMessage(&msg);
	}
	
	// Delete All Brush created to paint all panel & window background
	DeleteObject(bgBrushA);
	DeleteObject(bgBrushB);
	DeleteObject(bgBrushC);
	DeleteObject(bgBrushD);

	return (int)msg.wParam;
}





// Main Window Procedure
LRESULT CALLBACK WndProc(HWND hwnd, UINT iMsg, WPARAM wParam, LPARAM lParam)
{
	static  HWND      hwndLeftPanel, hwndSplitterPanel, hwndMsgPanel;
	static  CREATESTRUCT  *cs;
	RECT          rect;
	static HCURSOR			hcSizingWE;
	int						MouseXPos, MouseYPos;
	bool mouseOverFlag;

	

	switch(iMsg){
		case WM_CREATE :
			cs = (CREATESTRUCT *)lParam;				// For Application Handle hInstance
			
			
			// Create Left Panel 
			hwndLeftPanel = CreateWindowEx(	0,
							TEXT("LeftPanel"),
							TEXT("Left Panel"),
							WS_CHILD | WS_VISIBLE | WS_CLIPCHILDREN,
							0,				// Panel Coord. will be handle in the WM_SIZE via
							0,				// MoveWindow(). No InvalidateRec() in this case
							0,				// Panel Size will be handle in the WM_SIZE via				
							0,				// MoveWindow(). No InvalidateRec() in this case
							hwnd,			    // The Top Window Handle
							0,				// No menu for panel	
							cs->hInstance,	        // The App Handle
							0);

			// Create Splitter Panel 
			hwndSplitterPanel = CreateWindowEx(	0,
								TEXT("SplitterPanel"),
								TEXT("Splitter Panel"),
								WS_CHILD | WS_VISIBLE | WS_CLIPCHILDREN,
								0,				// Panel Coord. will be handle in the WM_SIZE via
								0,				// MoveWindow(). No InvalidateRec() in this case
								0,				// Panel Size will be handle in the WM_SIZE via				
								0,				// MoveWindow(). No InvalidateRec() in this case
								hwnd,			// The Top Window Handle
								0,				// No menu for panel	
								cs->hInstance,	// The App Handle
								0);


			// Create Msg Panel 
			hwndMsgPanel = CreateWindowEx(	    0,
								TEXT("MsgPanel"),
								TEXT("Message Panel"),
								WS_CHILD | WS_VISIBLE | WS_CLIPCHILDREN,
								0,				// Panel Coord. will be handle in the WM_SIZE via
								0,				// MoveWindow(). No InvalidateRec() in this case
								0,				// Panel Size will be handle in the WM_SIZE via				
								0,				// MoveWindow(). No InvalidateRec() in this case
								hwnd,			// The Top Window Handle
								0,				// No menu for panel	
								cs->hInstance,	// The App Handle
								0);

		InvalidateRect(hwnd, &rect, TRUE);

			break;




		case WM_SIZE :

			GetClientRect(hwnd, &rect);
			
			// Set Panels Size and Position for first time 
			// To make sense on the numbering I use, following is the definition
			// MsgPanel Height = 30
			// LeftPanel Width = 250
			// SplitterPanel Width = 500
			MoveWindow(hwndMsgPanel,		rect.left,			rect.top,			rect.right,		30,					FALSE);
			MoveWindow(hwndLeftPanel,		rect.left,			rect.top + 30,		250,			rect.bottom-30,		FALSE);
			MoveWindow(hwndSplitterPanel,	rect.left + 250,	rect.top + 30,		50,			rect.bottom-30,			FALSE);
			
			// Load App used Cursor
			hcSizingWE = LoadCursor(NULL, IDC_SIZEWE);

			InvalidateRect(hwnd, &rect, TRUE);
		
			break;




		case WM_MOUSEMOVE:
			// The Test Flag
			mouseOverFlag = 0;
			
			
			// Convert Cursor Position from LPARAM 
			MouseXPos	=	(int) LOWORD(lParam);
			MouseYPos	=	(int) HIWORD(lParam);

			if (MouseXPos > 0 && GetCursor() != hcSizingWE)
				SetCursor(hcSizingWE);

			break;




		case WM_CLOSE :
		 DestroyWindow(hwnd);
		 
		 break;




		case WM_DESTROY :
		 PostQuitMessage(0);
		 
		 break;
  }

  return DefWindowProc(hwnd, iMsg, wParam, lParam);
}






LRESULT CALLBACK LeftPanelProc(HWND hwnd, UINT iMsg, WPARAM wParam, LPARAM lParam)
{
	switch(iMsg)
	{
		case WM_CREATE :
		 break;
	}
	return DefWindowProc(hwnd, iMsg, wParam, lParam);
}





LRESULT CALLBACK SplitterPanelProc(HWND hwnd, UINT iMsg, WPARAM wParam, LPARAM lParam)
{
	switch(iMsg)
	{
		case WM_CREATE :
			break;
	}
	return DefWindowProc(hwnd, iMsg, wParam, lParam);
}





LRESULT CALLBACK MsgPanelProc(HWND hwnd, UINT iMsg, WPARAM wParam, LPARAM lParam)
{
  switch(iMsg)
  {
		case WM_CREATE :
			break;
  }
  return DefWindowProc(hwnd, iMsg, wParam, lParam);
}

[Irwan]

It has been 3 days stuck on this one. Can't anybody help me?

[hypheni]

Did you check for the return value of MoveWindow and if its failed check for the GetLastError.

[Irwan]

NO. i get it wrong.

in http://www.win32apicode.com/splitter.php, they able to capture mouse movement by hwnd (top most window) using WndProc because the splitter bar is part of hwnd. Its look like it a child window (by graphic illusion) but is is actually a hwnd window, area which is not cover by other child window. That why WndPRod for hwnd is able to process the Mouse move.


Pardon me

[hypheni]

Leave the other part and tell if you checked for the return value. If you get an 0 then check for GetLastError and tell whats the output ?

[Igor Vartanov]

There's no need to pass mouse move to parent/main window, as the splitter window itself is able to handle all the stuff alright.

The sample goes.

[Irwan]

Yes Mate.

I guess so. I need to process it in the SplitterPanelProc.

I miss read coding in the example.