如何在 Java 中将 ScrollPane 添加到面板? [英] How do I add ScrollPane to a panel in Java?

问题描述

我想在运行时将垂直堆叠的不同按钮添加到 JPanel 并使用 JScrollPane 以便所有按钮都可见(有一些滚动).

为了做到这一点，我将我的 JPanel 添加到 JScrollPane，然后我将按钮添加到我的 JPanel.

但是，当我这样做时，垂直滚动条不允许我看到所有图像.例如，当我添加 7 个按钮时，我只能滚动查看 5 个完整图像和 6 个图像的一半.

为什么我的滚动条不允许我显示所有 7 个按钮?

解决方案

像这样创建面板和滚动面板:

JPanel panel = new JPanel();JScrollPane scrollPane = new JScrollPane( panel );

在运行时向面板添加按钮时，代码应为:

panel.add( button );panel.revalidate();

只要您使用布局管理器，就会重新计算首选大小并显示滚动条.

I want to add different buttons, vertically stacked, to a JPanel at run-time and use a JScrollPane so that all buttons will be visible (with some scrolling).

In order to do this, I have added my JPanel to a JScrollPane, after which I add buttons to my JPanel.

However, when I do this the vertical scrollbar does not allow me to see all images. For example when I add 7 buttons I can only scroll to see 5 full images and half of the 6 images.

Why doesn't my scrollbar allow me to display all 7 buttons?

解决方案

Create the panel and scrollpane like:

JPanel panel = new JPanel();
JScrollPane scrollPane = new JScrollPane( panel );

When you add buttons to the panel at run time the code should be:

panel.add( button );
panel.revalidate();

As long as you are using a layout manager the preferred size will be recalculated and the scrollbar will appear.

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