How to capture the activation of the menubar? - winapi

Question

I'm now trying to do some owner draw of the window frame , including the caption , the border , the mini/max/restore zone and the menubar. Escpecially for the menubar , I have done some gdi operations to redefine the area of the menubar , and repaint on WM_NCPAINT. However, when I press the Alt key or F10, the original menubar activated. I found it has something with the WM_SYSKEYDOWN , and then I blocked it. After that I put a control into the frame window, for expample, a edit control, when the control get focused, I press Alt or F10 , the original menubar of the frame window get activated again.
Wow , seems have something with the wm_notify message.
LRESULT CALLBACK WindowProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)
{
switch (msg)
{
case WM_NCACTIVATE:
case WM_NCPAINT: {
//NC and Menubar redrawing.
BOOL active_flag;
HDC hdc;
RECT rect={0,0,0,0};
active_flag=(BOOL)wParam;
hdc=GetWindowDC(hwnd);
Frame_NCDraw(hwnd,hdc,rect,0,&active_flag);
Frame_MenuBarDraw(hwnd,hdc);
ReleaseDC(hwnd, hdc);
return !active_flag;
} break;
case WM_INITMENUPOPUP: {
//set the background of the menu item. a little long , no source code paste.
...
//
} break;
case WM_NCHITTEST: {
// redefine the area of the HTMENU.
} break;
case WM_MEASUREITEM: {
LPMEASUREITEMSTRUCT lpmis;
lpmis = (LPMEASUREITEMSTRUCT)lParam;
//Menu item adjust the height/width.
if(lpmis->CtlType == ODT_MENU) {
UINT menu_item_id = lpmis->itemID;
lpmis->itemWidth = 200;
lpmis->itemHeight = ((menu_item_id==0x0)?5:28);
}
} break;
case WM_DRAWITEM: {
UINT ctrl_id=(UINT)wParam;
LPDRAWITEMSTRUCT pDraw=(LPDRAWITEMSTRUCT)lParam;
if(pDraw->CtlType==ODT_MENU) {
Frame_DrawMenuItem(pDraw); // MenuItem owner drawing.
}
} break;
.....
}
So How should I deal with the activation of the original menubar ? I mean , I want to forbid the painting for the original menubar. Instead , I want my MenuBar activated by the Alt or F10 key press.

Answer 1

In addition to the WM_SYSKEYDOWN message, you will also receive WM_SYSCOMMAND with SC_KEYMENU, you need to handle this command to activate and display your own menu.
lParam contains the character code of the key that is used with the
ALT key to display the popup menu. For example , pressing ALT+F to
display the File popup will cause a WM_SYSCOMMAND with wParam equal
to SC_KEYMENU and lParam equal to'f'.
If only ALT/F10, the test result of lParam is 0.
case WM_SYSCOMMAND:
if (wParam == SC_KEYMENU)
{
//Draw activated menubar
switch (lParam)
{
case 0:
break;
case 'f':
//pop up menu "File"
break;
case 'h':
//pop up menu "Help"
break;
default:
break;
}
return 0;
}
else
return DefWindowProc(hwnd, msg, wParam, lParam);