在JScrollPane中获取显示的组件 [英] Get shown component in JScrollPane

问题描述

我有一个包含JPanel的JScrollPane.我用许多按钮填充了这个JPanel.

I have a JScrollPane containing a JPanel. I fill this JPanel with many buttons.

是否有可能获得当前显示的按钮?

Is there any possibility to get the currently shown buttons?

我知道我可以通过jpanel.getComponents()访问JPanel的子级，但是这些都是该窗格中的所有组件.我只需要屏幕上当前显示的那些.

I know I can access the children of a JPanel via jpanel.getComponents() but those are all components in this pane; I want only the ones that are currently on screen.

推荐答案

我假定此容器在屏幕上已经可见，然后建议

I assume that this container is already visible on the screen, then I suggest

1)从中提取 JViewPort JScrollPane ，

2) addChangeListener 到JViewPort

3)每个可见的JComponent(s)返回矩形

3) each visible JComponent(s) returns Rectangle

4)和

4) and Rectangle#intersects returns Boolean value if is JComponent(s) visible or not in JViewPort

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