使用Swing组件作为内容的自定义Java工具提示不会显示 [英] Custom Java tool tip with Swing components as content does not show up

问题描述

我正在尝试在组件的工具提示中显示多个图像，找到 createToolTip（）并实现一个自定义，添加如下所需的组件：

I'm trying to show multiple images in a component's tooltip, found createToolTip() and implemented a custom that adds the needed components like this:

setComponent(component);

JPanel images = new JPanel(null);
images.setLayout(new BoxLayout(images, BoxLayout.X_AXIS));
for(ImageIcon icon:myIcons) {
    images.add(new JLabel(icon));
}

JPanel content = new JPanel(new BorderLayout());
content.add(new JLabel(title), BorderLayout.NORTH);
content.add(new JLabel(description));
content.add(images, BorderLayout.SOUTH);

add(content);

然而，我看到的只是一个小点，表示工具提示已显示，但不知何故大小被忽略。我错过了什么实现自定义工具提示？

However, all I see is a little dot, indicating that the tool tip is shown, but somehow the size is ignored. What do I miss implementing a custom tooltip?

推荐答案

基本问题是JToolTip

The base "problems" are that JToolTip

• is-not 设计为容器，它只是偶然的容器，因为JComponent是。对于Swingnot-container，ui-delegate有责任充当LayoutManager。


• 不够丰富，它可以处理纯文本（至少使用紧急门html，这是@Andrew的最爱： - ）

• is-not designed as a container, it's only accidentally a container because JComponent is. For a Swing "not-container" its the responsibility of the ui-delegate to act as LayoutManager.
• isn't rich enough, it can handle text-only (at least with the emergency door html, which is @Andrew's favourite :-)

绕过这些限制基本上是推动小部件几乎超越边缘。一个干净的解决方案将滚动一个新的组件..另一方面，OP已经找到螺丝进行调整。唯一可以略微改进的是既不调用setXXSize，也不设置自定义ui。相反，通过覆盖getXXSize（）来使其行为像容器一样：

By-passing those limitations basically is a driving that widget nearly over the edge. A clean solution would roll a new component .. On the other hand, the OP already found the screws to tweak. The only thingy that could be slightly improved is to neither call setXXSize, nor set a custom ui. Instead, make it behave like a container by overriding getXXSize() like:

@Override
public Dimension getPreferredSize() {
    if (getLayout() != null) {
        return getLayout().preferredLayoutSize(this);
    }
    return super.getPreferredSize();
}

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