Processing the WM_INITMENUPOPUP Message
Not all clipboard commands are available to the user at any given time. An
application should process the
WM_INITMENUPOPUP message to enable the menu items for available commands and disable
unavailable commands.
Following is the WM_INITMENUPOPUP case for an application named Label.
case WM_INITMENUPOPUP:
InitMenu((HMENU) wParam);
break;
The InitMenu function is defined as follows.
- oid WINAPI InitMenu(HMENU hmenu)
{
int cMenuItems = GetMenuItemCount(hmenu);
int nPos;
UINT id;
UINT fuFlags;
PLABELBOX pbox = (hwndSelected == NULL) ? NULL :
(PLABELBOX) GetWindowLong(hwndSelected, 0);
for (nPos = 0; nPos < cMenuItems; nPos++)
{
id = GetMenuItemID(hmenu, nPos);
switch (id)
{
case IDM_CUT:
case IDM_COPY:
case IDM_DELETE:
if (pbox == NULL || !pbox->fSelected)
fuFlags = MF_BYCOMMAND | MF_GRAYED;
else if (pbox->fEdit)
fuFlags = (id != IDM_DELETE && pbox->ichSel
== pbox->ichCaret) ?
MF_BYCOMMAND | MF_GRAYED :
MF_BYCOMMAND | MF_ENABLED;
else
fuFlags = MF_BYCOMMAND | MF_ENABLED;
EnableMenuItem(hmenu, id, fuFlags);
break;
case IDM_PASTE:
if (pbox != NULL && pbox->fEdit)
EnableMenuItem(hmenu, id,
IsClipboardFormatAvailable(CF_TEXT) ?
MF_BYCOMMAND | MF_ENABLED :
MF_BYCOMMAND | MF_GRAYED
);
else
EnableMenuItem(hmenu, id,
IsClipboardFormatAvailable(
uLabelFormat) ?
MF_BYCOMMAND | MF_ENABLED :
MF_BYCOMMAND | MF_GRAYED
);
}
}
}
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