func (m *Menu) insertAction(action *Action, visibleChanged bool) (err error) {
if !visibleChanged {
action.addChangedHandler(m)
defer func() {
if err != nil {
action.removeChangedHandler(m)
}
}()
}
if !action.Visible() {
return
}
index := m.actions.indexInObserver(action)
var mii win.MENUITEMINFO
m.initMenuItemInfoFromAction(&mii, action)
if !win.InsertMenuItem(m.hMenu, uint32(index), true, &mii) {
return newError("InsertMenuItem failed")
}
menu := action.menu
if menu != nil {
menu.hWnd = m.hWnd
}
if m.hWnd != 0 {
win.DrawMenuBar(m.hWnd)
}
return
}
func (mw *MainWindow) SetVisible(visible bool) {
if visible {
win.DrawMenuBar(mw.hWnd)
if mw.clientComposite.layout != nil {
mw.clientComposite.layout.Update(false)
}
}
mw.FormBase.SetVisible(visible)
}
func (m *Menu) removeAction(action *Action, visibleChanged bool) error {
index := m.actions.indexInObserver(action)
if !win.RemoveMenu(m.hMenu, uint32(index), win.MF_BYPOSITION) {
return lastError("RemoveMenu")
}
if !visibleChanged {
action.removeChangedHandler(m)
}
if m.hWnd != 0 {
win.DrawMenuBar(m.hWnd)
}
return nil
}