英文:
What are AWT's HierarchyListener and HierarchyEvent Equivalents in JavaFX
问题
在Java AWT中，我们有能力添加一个HierarchyListener来接收组件的层次结构发生变化时的事件，当包含该容器的层次结构发生变化时。通过接收一个HierarchyEvent（表示Component所属的Component层次结构发生更改的事件），我们可以监听以下变化事件：
- 层次结构变化事件（HierarchyListener）
- 添加祖先
- 移除祖先
- 层次结构变得可显示
- 层次结构变得不可显示
- 层次结构在屏幕上显示（可见和可显示）
- 层次结构在屏幕上隐藏（不可见或不可显示）
- 祖先重塑事件（HierarchyBoundsListener）
- 祖先被调整大小
- 祖先被移动
示例代码：
JPanel panel = new JPanel();
panel.addHierarchyListener((event) -> {
if((event.getChangeFlags() & HierarchyEvent.HIERARCHY_CHANGED) != 0) {
// 层次结构树变化
}
});
在JavaFX中如何监听相同类型的事件？例如，如何在JavaFX中在任何Node的祖先显示或隐藏时收到通知？
英文:
In Java AWT, we have the ability to add a HierarchyListener to receive hierarchy changed events from a component when the hierarchy to which that container belongs changes. By receiving a HierarchyEvent (An event which indicates a change to the Component hierarchy to which Component belongs), we can listen to the following change events:
- Hierarchy Change Events (HierarchyListener)
- Addition of an ancestor
- Removal of an ancestor
- Hierarchy made displayable
- Hierarchy made undisplayable
- Hierarchy shown on the screen (both visible and displayable)
- Hierarchy hidden on the screen (either invisible or undisplayable)
- Ancestor Reshape Events (HierarchyBoundsListener)
- An ancestor was resized
- An ancestor was moved
Sample code:
JPanel panel = new JPanel();
panel.addHierarchyListener((event) -> {
if((event.getChangeFlags() & HierarchyEvent.HIERARCHY_CHANGED) != 0) {
// hierarchy tree changed
}
});
How can I listen to the same type of events in JavaFX? As an example, how can I get notified when any of a Node's ancestors get shown or hidden in JavaFX?
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