+ // Without the two lines of code below, if the toolbar was repainted during
+ // OnLeftClick(), then it could end up without the tool bitmap temporarily
+ // (see http://lists.nongnu.org/archive/html/lmi/2008-10/msg00014.html).
+ // The Update() call bellow ensures that this won't happen, by repainting
+ // invalidated areas of the toolbar immediately.
+ //
+ // To complicate matters, the tool would be drawn in depressed state (this
+ // code is called when mouse button is released, not pressed). That's not
+ // ideal, having the tool pressed for the duration of OnLeftClick()
+ // provides the user with useful visual clue that the app is busy reacting
+ // to the event. So we manually put the tool into pressed state, handle the
+ // event and then finally restore tool's original state.
+ ::SendMessage(GetHwnd(), TB_SETSTATE, id, MAKELONG(state | TBSTATE_PRESSED, 0));
+ Update();
+
+ bool allowLeftClick = OnLeftClick(id, toggled);
+
+ // Restore the unpressed state. Enabled/toggled state might have been
+ // changed since so take care of it.
+ if (tool->IsEnabled())
+ state |= TBSTATE_ENABLED;
+ else
+ state &= ~TBSTATE_ENABLED;
+ if (tool->IsToggled())
+ state |= TBSTATE_CHECKED;
+ else
+ state &= ~TBSTATE_CHECKED;
+ ::SendMessage(GetHwnd(), TB_SETSTATE, id, MAKELONG(state, 0));
+