当显示 HTML 文本时，JLabel 禁用时不会变灰

发布于 2024-08-21 06:00:37 字数 1051 浏览 7 评论 0原文

如何让显示 HTML 字符串的 JLabel 显示为灰色（这是不显示 HTML 文本的 JLabel 的行为）？除了通过修改 foreground 属性来实际更改颜色之外，还有其他方法吗？

JLabel label1 = new JLabel("Normal text");
JLabel label2 = new JLabel("<html>HTML <b>text</b>");
// Both labels are now black in colour

label1.setEnabled(false);
label2.setEnabled(false);
// label1 is greyed out, label2 is still black in colour

非常感谢您的所有回复。据我所知，Java 似乎不支持在使用 HTML 文本时自动变灰 JLabel。 Suraj 的解决方案来了考虑到限制，最接近修复。

然而，我尝试了一种不同的开箱即用方法，我将 HTML 文本 JLabel 放在内部 JPanel 中，并执行了以下操作

mInnerPanel.setEnabled(shouldShow); //shouldShow is a boolean value

：成功了。对于这种方式有什么建议吗？

编辑：添加了已实现的解决方案。

原文

How do I get a JLabel displaying a HTML string to appear greyed out (which is the behaviour of JLabels that don't display HTML text)? Is there another way than actually changing the colour myself by modifying the foreground property?

JLabel label1 = new JLabel("Normal text");
JLabel label2 = new JLabel("<html>HTML <b>text</b>");
// Both labels are now black in colour

label1.setEnabled(false);
label2.setEnabled(false);
// label1 is greyed out, label2 is still black in colour

Thank you very much for all of your responses. From what I gather, it seems that Java doesn't support automatic greying out of JLabels when they use HTML text. Suraj's solution has come closest to the fix considering the limitations.

I have however, tried a different out-of-the box approach, where I have put the HTML text JLabels inside of an inner JPanel and did this:

mInnerPanel.setEnabled(shouldShow); //shouldShow is a boolean value

Which hasn't worked. Any suggestions for this way?

EDIT: Added implemented solution.

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清秋悲枫 2024-08-28 06:00:37

如果文本是 HTML，则文本不会变灰，因为 BasicLabelUI#paint() 中的以下代码

        View v = (View) c.getClientProperty(BasicHTML.propertyKey);
        if (v != null) {
        v.paint(g, paintTextR);
        }

如您所见，如果文本是 html，则 View 用于绘制，而它不是检查标签是否启用。
因此我们需要明确地这样做，如下所示：

label2.addPropertyChangeListener(new PropertyChangeListener() {
   public void propertyChange(PropertyChangeEvent evt) {
    if (!evt.getPropertyName().equals("enabled"))
     return;
    if (evt.getNewValue().equals(Boolean.FALSE))
     label2.setText("<html><font color=gray>HTML <b>text</b></html>");
    else
     label2.setText("<html><font color=black>HTML <b>text</b></html>");
   }
  });

If text is HTML, the text wont be grayed out because of the following code in BasicLabelUI#paint()

        View v = (View) c.getClientProperty(BasicHTML.propertyKey);
        if (v != null) {
        v.paint(g, paintTextR);
        }

As you can see if the text is html, then the View is used to paint and it is not checked wheter the label is enabled or not.
Hence we need to do it explictly as shown below:

label2.addPropertyChangeListener(new PropertyChangeListener() {
   public void propertyChange(PropertyChangeEvent evt) {
    if (!evt.getPropertyName().equals("enabled"))
     return;
    if (evt.getNewValue().equals(Boolean.FALSE))
     label2.setText("<html><font color=gray>HTML <b>text</b></html>");
    else
     label2.setText("<html><font color=black>HTML <b>text</b></html>");
   }
  });

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回眸一遍 2024-08-28 06:00:37

实现的解决方案：

    Color foreground = (shouldShow) ? SystemColor.textText : SystemColor.textInactiveText;
    for (Component comp : mInnerPanel.getComponents())
    {
        comp.setForeground(foreground);
    }

最终陷入并使用了setForeground，因为看起来Java在绘制JLabel时似乎显式忽略了enabled属性，所以只要它包含 HTML 文本。另请参阅@Suraj 的回答，用于“纯”解决方案。

Implemented solution:

    Color foreground = (shouldShow) ? SystemColor.textText : SystemColor.textInactiveText;
    for (Component comp : mInnerPanel.getComponents())
    {
        comp.setForeground(foreground);
    }

Caved in and used setForeground in the end, as it appears that Java seems to explicitly ignore the enabled property when painting JLabels so long as it contains HTML text. See also @Suraj's answer, for "pure" solution.

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高跟鞋的旋律 2024-08-28 06:00:37

我建议如下，它是此处提供的两种解决方案的组合：

public class HtmlLabel extends JLabel{
    public void setEnabled(boolean enabled){
        if(getClientProperty(BasicHTML.propertyKey) != null ){
            Color foreground = (enabled) ? SystemColor.textText : SystemColor.textInactiveText;
            setForeground(foreground);
        }
        super.setEnabled(enabled);
    }
}

I would suggest the following, which is combination of two solutions provided here:

public class HtmlLabel extends JLabel{
    public void setEnabled(boolean enabled){
        if(getClientProperty(BasicHTML.propertyKey) != null ){
            Color foreground = (enabled) ? SystemColor.textText : SystemColor.textInactiveText;
            setForeground(foreground);
        }
        super.setEnabled(enabled);
    }
}

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