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

问题描述

我试图在组件的工具提示中显示多个图像，找到了 createToolTip() 并实现了一个自定义添加所需的组件，如下所示:

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，表示显示了工具提示，但不知何故忽略了大小.实施自定义工具提示时我会错过什么?

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

基本的问题"是 JToolTip

The base "problems" are that JToolTip

• 不是被设计为容器，它只是偶然的容器，因为 JComponent 是.对于 Swing 非容器"，它的 ui 委托有责任充当 LayoutManager.
• 不够丰富，它只能处理文本(至少对于紧急门 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使小部件几乎超越边缘.一个干净的解决方案会滚动一个新组件.另一方面，OP 已经找到了要调整的螺丝.唯一可以稍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() 使其表现得像一个容器:

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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