如何用 PyGTK 连接“显示”和“隐藏”信号？
[英]How to connect the “show” and “hide” signals with PyGTK?
问题描述
I would like to have a callback called when some widget (a Menu ) is shown or hidden.
我希望在显示或隐藏某些小部件（ Menu ）时调用回调。 Doing this way:这样做：
menu = gtk.Menu()
menu.connect("show", self.menu_show, menu)
menu.connect("hide", self.menu_hide, menu)
Callback functions are never called.回调函数永远不会被调用。 Are show and hide signals the ones I am looking for? show和hide信号是我正在寻找的信号吗？ Are they special?它们很特别吗？ Is there something I am missing to have this working?有什么我想念的东西吗？
1 个解决方案
解决方案1
1 已采纳 2011-05-01 10:32:37
I think those signals are emitted only when the respective methods on an object are called.我认为只有在调用 object 上的相应方法时才会发出这些信号。 If you want to connect to when a widget is (re-) drawn, take the expose-event signal.如果您想在（重新）绘制小部件时连接，请使用 expose-event 信号。 But why do you want to anyway?但是你为什么要这样做呢？ A menu is there to provide to the user choices for actions, not to run some setup/teardown code when it is shown/hidden.有一个菜单向用户提供操作选择，而不是在显示/隐藏时运行某些设置/拆卸代码。
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