Method onRemovedWidget

splitter.go:552–608

(index int, widget Widget)

}

func (s *Splitter) onRemovedWidget(index int, widget Widget) (err error) {
	defer func() {
		if err != nil {
			return
		}

		s.updateMarginsForFocusEffect()
	}()

	_, isHandle := widget.(*splitterHandle)
	if !s.removing && isHandle && s.children.Len()%2 == 1 {
		return newError("cannot remove splitter handle")
	}

	if !isHandle {
		sl := s.layout.(*splitterLayout)
		widget.AsWidgetBase().Property("Visible").Changed().Detach(sl.hwnd2Item[widget.Handle()].visibleChangedHandle)
	}

	if !isHandle && s.children.Len() > 1 {
		defer func() {
			if err != nil {
				return
			}

			var handleIndex int
			if index == 0 {
				handleIndex = 0
			} else {
				handleIndex = index - 1
			}

			s.removing = true
			handle := s.children.items[handleIndex].window.(*splitterHandle)

			if err = handle.SetParent(nil); err == nil {
				sl := s.layout.(*splitterLayout)

				for _, item := range sl.hwnd2Item {
					item.oldExplicitSize = 0
					item.keepSize = false
				}

				sl.resetNeeded = true
				s.RequestLayout()

				handle.Dispose()
			}

			s.removing = false
		}()
	}

	err = s.ContainerBase.onRemovedWidget(index, widget)

	return
}