Thread: [Q] Responding to mouse click

I'm trying to respond to a mouse click when the mouse is on top of a certain area. I tried two approaches, and neither worked..

area1 is a handle to the child window (a button) that I want the mouse to be on for the prog to react.

My first try was responding to the WM_LBUTTONDOWN message:

Code:

case WM_LBUTTONDOWN:
	  curArea = GetCapture();
	  if (curArea == area1) DoSomething();
	  break;

That didn't work; curArea was never equal to area1 (or any other window handle =/ ). The only time control passed to DoSomething was when I took the if out.

I also tried WM_COMMAND:

Code:

case WM_COMMAND:
	 curArea = (HWND)lParam;
	 if (curArea == area1) DoSomething();
	 break;

That didn't work either .

Any suggestions?

Every control is a window, all windows generate messages, if you want to know if a button is clicked on you check if a message is generated for the button not the mouse (its possible but pointless)

so you search msdn for button control: http://msdn2.microsoft.com/en-us/library/ms673340.aspx
you check button messages: http://msdn2.microsoft.com/en-us/library/ms673328.aspx

you see for button messages it says "the low-order word of the wParam parameter contains the control identifier, the high-order word of wParam contains the notification code, and the lParam parameter contains the control window handle."

and then you find the msg your interested in: "BN_CLICKED The user clicked a button." (http://msdn2.microsoft.com/en-us/library/ms673572.aspx)

"The parent window of the button receives the BN_CLICKED notification code through the WM_COMMAND message.

wParam
The low-order word contains the button's control identifier. The high-order word specifies the notification message.
lParam
A handle to the button."

ok so:

Code:

if(msg == WM_COMMAND)
{

}

next you need to check if its the button your intereseted in, if its from a resource ID:

"The low-order word contains the button's control identifier"

so:

Code:

if(LOWORD(wParam) == MY_BUTTON)

or if you created the button then you will have a handle to it:

"lParam - A handle to the button."

Code:

if((HWND)lParam == hWndMyButton)

So now you wanna check if the button is clicked -

"The high-order word specifies the notification message"

Code:

if(HIWORD(wParam) == BN_CLICKED)

so to sum up:

Code:

if(msg == WM_COMMAND)
{
	if(LOWORD(wParam) == MY_BUTTON)
	{
		if(HIWORD(wParam) == BN_CLICKED)
		{
			// Wah the button was clicked!
		}
	}
}

Thanks . I was forgetting to check BN_CLICKED.. However, that's not my real problem (which I just figured out).

Correct me if I'm wrong, but if a window isn't visible then it can't be clicked..