Adding Context Menus

Next I wanted to add a context menu. This requires handling the WM_CONTEXTMENU message, which is sent when the user clicks the right mouse button in the client window. For instance, when the user right-clicks a list view item (the wParam parameter is filled in with the handle of the window that received the right click), a context menu for that item appears.

This task is straightforward. Basically, you load the menu and call TrackPopupMenu, as you would in a 16-bit Windows-based application. When the user chooses an item from the context menu, the appropriate command is generated and sent to the window procedure as a WM_COMMAND message. The following code, from the main window procedure, demonstrates how to handle the WM_CONTEXTMENU message:

case WM_CONTEXTMENU:

// The right mouse button has been clicked.

if ((HWND)wParam == g_Listing.hWndListView)

{

// Get the context menu from the resource file.

hMenu = LoadMenu (g_Listing.hInst, "HousePopupMenu");

if (! hMenu)

break;;



// Get the first item in the menu for TrackPopupMenu().

hMenuTrackPopup = GetSubMenu (hMenu, 0);



// Draw and track the "floating" menu.

TrackPopupMenu (hMenuTrackPopup, 

TPM_LEFTALIGN | TPM_RIGHTBUTTON,

LOWORD(lParam), HIWORD(lParam), 

0, g_Listing.hWndListView, NULL);



// Destroy the menu.

DestroyMenu (hMenu);

}

break;