Swing - 如何模仿为什么我的外观和感觉会绘制禁用的图标? [英] Swing - How to imitate the why my look and feel draws disabled icons?

问题描述

当您为 Swing 控件设置图标(比如 JButton)时，会自动生成一个禁用的带有深灰色的图标.我希望能够模仿禁用状态更改图标颜色的方式，因此我可以稍微扭曲一下创建自己的禁用图标，并将其设置为禁用按钮.

When you set the icon for a Swing control (say a JButton), a disabled icon with grayed-darker colors automatically generates. I want to be able to imitate the way the icon colors are changed for the disabled state, so I can create my own disabled icon with a little twist, and set it as the disabled button.

有没有办法实现这一点(除了首先实例化控件并检索它的图标，我正在寻找更直接、更简洁的方法)?

Is there a way to achieve this (other then first instantiating the control and retrieving it's icon, I'm looking for more straight-forward less hacky way)?

推荐答案

有没有办法实现这一点(除了首先实例化控件并检索它的图标

Is there a way to achieve this (other then first instantiating the control and retrieving it's icon

好吧，LAF 负责创建禁用的图标.AbstractButton 按钮类中的 getDisabledIcon() 方法如下所示:

Well the LAF is responsible for creating the disabled Icon. The getDisabledIcon() method from the AbstractButton button class looks something like this:

Icon disabledIcon = UIManager.getLookAndFeel().getDisabledIcon(this, getIcon());

所以理论上 LAF getDisabledIcon() 方法期望组件作为参数传入.因此，您的问题的答案是:是的，需要先创建按钮".

So in theory the LAF getDisabledIcon() method expects the component to be passed in as a parameter. So the answer to your question would be: "yes, the button needs to be created first".

但是在实践中似乎(至少对于 Metal 和 Windows)该组件实际上并未用于创建图标，因此您可以执行以下操作:

However in practice it appears (for Metal and Windows at least) that the component is not actually used in the creation of the icon so you could do something like:

ImageIcon original = new ImageIcon( ... );
Icon disabled = UIManager.getLookAndFeel().getDisabledIcon(null, original);

使用这种方法是有风险的，因为其他 LAF 可能确实需要该组件来创建禁用的图标.

Using this approach is risky because other LAF's may indeed need the component to create the disabled Icon.

然而，我猜你可以创建一个单独的组件，然后用多个不同的图标调用这个方法，而不是传递 null，所以它仍然比为每个图标创建一个唯一的组件要好一些.

However, instead of passing null, I guess you could create a single component and then call this method with multiple different icons, so it would still be a little better than creating a unique component for each Icon.

这是我用来测试这种方法的 SSCCE:

Here is the SSCCE I used to test this approach:

import javax.swing.*;
import javax.swing.plaf.metal.*;
import java.awt.*;
import java.awt.image.*;

public class ButtonDisabledIcon extends JPanel
{
    public ButtonDisabledIcon()
    {
        ImageIcon original = new ImageIcon( "dukewavered.gif" );

        JButton button1 = new JButton( "Original" );
        button1.setIcon( original );
        add(button1);

        JButton button2 = new JButton( "Disabled" );
        button2.setIcon(original);
        button2.setEnabled(false);
        add(button2);

        JButton button3 = new JButton( "LAF Disabled" );
        button3.setIcon( UIManager.getLookAndFeel().getDisabledIcon(null, original) );
        add(button3);
  }
    private static void createAndShowUI()
    {
/*
        try
        {
            UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
        }
        catch (Exception e) { }
*/
        JFrame frame = new JFrame("Button Disabled Icon");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.add( new ButtonDisabledIcon() );
        frame.pack();
        frame.setLocationByPlatform( true );
        frame.setVisible( true );
    }

    public static void main(String[] args)
    {
        EventQueue.invokeLater(new Runnable()
        {
            public void run()
            {
                createAndShowUI();
            }
        });
    }
}

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