如何使用Nimbus LookAndFeel更改JToolTip的背景颜色？ [英] How to change the background color of a JToolTip using Nimbus LookAndFeel?

问题描述

在使用Nimbus LookAndFeel的基于Swing的Java应用程序中，我尝试设置工具提示的背景颜色。所以我创建了一个JToolTip的子类，并通过重写createToolTip（）在我的组件中使用它。到目前为止很好并且工具提示正确显示，但背景颜色不会改变。前景色按预期设置。
将LookAndFeel更改为例如金属我可以按预期设置颜色。

In a Swing-based Java application using Nimbus LookAndFeel I try to set the background color of my tooltips. So I created a subclass of JToolTip and used it in my components by overriding createToolTip(). Fine so far and the tooltip is shown correctly, but the background color does not change. The foreground color is set as expected. When changing the LookAndFeel to e.g. Metal I can set colors as expected.

这是一个能够在Metal和Nimbus之间切换的小例子。正如yopu希望看到的那样，按钮工具提示的背景颜色仅在使用Metal时设置。

Here a small example with ability to switch between Metal and Nimbus. As yopu hopefully see, the background color of the button's tooltip is only set when Metal is used.

import java.awt.Color;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JToolTip;

public class TooltipTestApp {

private static final String METAL_LOOK_AND_FEEL = "javax.swing.plaf.metal.MetalLookAndFeel";
private static final String NIMBUS_LOOK_AND_FEEL = "com.sun.java.swing.plaf.nimbus.NimbusLookAndFeel";
private static JButton button;
private static String usedLookAndFeel = NIMBUS_LOOK_AND_FEEL;

    public static void main(String args[]) {
        button = new JButton() {

            @Override
            public JToolTip createToolTip() {
                JToolTip toolTip = super.createToolTip();
                toolTip.setBackground(Color.BLACK);
                toolTip.setForeground(Color.RED);

                    return toolTip;
            }
        };

        button.addActionListener(new java.awt.event.ActionListener() {

            @Override
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                TooltipTestApp.toggleLookAndFeel();
            }
        });

        button.setToolTipText("Some text");

        JFrame frame = new JFrame("TooltipTestApp");

        TooltipTestApp.toggleLookAndFeel();
        frame.add(button);
        frame.setSize(450, 100);
        frame.setVisible(true);
    }

    private static void toggleLookAndFeel() {
        try {
            if (usedLookAndFeel.equals(METAL_LOOK_AND_FEEL)) {
                usedLookAndFeel = NIMBUS_LOOK_AND_FEEL;
            } else {
                usedLookAndFeel = METAL_LOOK_AND_FEEL;
            }

            UIManager.setLookAndFeel(usedLookAndFeel);

            String lookAndFeelName = usedLookAndFeel.substring(usedLookAndFeel.lastIndexOf(".") + 1);
            button.setText("This is: " + lookAndFeelName);
        } catch (Exception ex) {
            ex.printStackTrace();
        }
    }
}

推荐答案

以下也适用于Metal LAF而不覆盖createToolTip（）方法：

The following also works for the Metal LAF without overriding the createToolTip() method:

UIManager.put("ToolTip.background", Color.RED);

LAF可以选择是否使用UIManager属性。我不知道这是否适用于Nimbus。

LAF's can choose whether to use the UIManager properties or not. I have no idea if this will work with Nimbus.

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