Intercept WM_NCPAINT when using CreatePopupMenu and TrackPopupMenu?

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Hello,

how can i intercept WM_NCPAINT message of a popup menu window created with CreatePopupMenu and displayed with TrackPopupMenu? Is there a way to assign an application defined WindowProc to a menu having only a HMENU handle?

I can get the handle to the popup window in the parent window's WM_INITMENUPOPUP handler with

HWND hMenuWnd = FindWindow("#32768", NULL);

Now, will this work if i set the GWL_WNDPROC property through SetWindowLong at this point?

Your advice will be highly appreciated!

Posted 23-Oct-11 23:36pm

mardul

Updated 23-Oct-11 23:55pm

v3

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Malli_S 24-Oct-11 5:46am

What exactly you wanna to achieve ?

mardul 24-Oct-11 6:33am

I'm customizing the appearance of the context menu. Almost everything works with owner draw functionality. It just happens that the frame of the popup menu is not accessible. As a workaround i'm trying to intercept the WM_NCPAINT to prevent the system defined frame to be drawn.

I can intercept the message in the manner described above. My only worry is about whether it is safe to reassign the WindowProc like that or not?

Of course if there's a better way i would be very happy to hear about it.

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Richard MacCutchan · Answer 1 · 2011-10-23T23:53:00

Solution 1

Take a look here[^], there may be a message that will help to capture what you want.

Posted 23-Oct-11 23:53pm

Richard MacCutchan

v2

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mardul 24-Oct-11 6:07am

Thank you for your help. I looked into the menu notification messages but none of them allow changing the appearance of the menu.

jcyangzh · Answer 2 · 2014-02-24T21:29:00

Yes, you are right. Just subclass to a new wndproc, it should be safe, sample code:

C++

LRESULT CALLBACK MenuButton::WndProc( HWND hwnd, UINT message, WPARAM wparam, LPARAM lparam )
	{
		TRACE("menubutton::wndproc message = %x, wparam = %x\n", message, wparam);
		if (message == WM_KEYDOWN && wparam == VK_LEFT) {
			MenuButton* prev = dynamic_cast<menubutton*>(prevWidget());
			if (prev) {
				cancelMenu(Widget::hwnd());
				fnNativePoint pt(1,1);
				prev->clientToNativePt(pt);
				PostMessage(Widget::hwnd(), WM_LBUTTONDOWN, 0, MAKELPARAM(pt.x, pt.y));
				return 0;
			}
			return 0;
		} else if (message == WM_KEYDOWN && wparam == VK_RIGHT) {
			MenuButton* next = dynamic_cast<menubutton*>(nextWidget());
			if (next) {
				cancelMenu(Widget::hwnd());
				fnNativePoint pt(1,1);
				next->clientToNativePt(pt);
				PostMessage(Widget::hwnd(), WM_LBUTTONDOWN, 0, MAKELPARAM(pt.x, pt.y));
				return 0;
			}
		}
		return CallWindowProc(prevWndProc_, hwnd, message, wparam, lparam);
	}

In above I simulate the next/prev feature of window's default menu bar. cancelMenu(hwnd) send WM_CANCELMODE to parent window.