合成器外观中的默认按钮输入图?

问题描述

我正尝试使用UIManager来获取和清除一些默认的按键绑定，以使空格键不会激活我的JButton，如.问题是，可能由于我的合成器外观，(InputMap)UIManager.get("Button.focusInputMap");返回了null.有谁知道以其他方式轻松清除组件输入映射的方法，或者在这种情况下UIManager为什么返回null?任何提示，不胜感激，谢谢.

I am trying to use the UIManager to get and clear some default key bindings so that the spacebar doesn't activate my JButtons, as explained here. Problem is, likely due to my synth look and feel, (InputMap)UIManager.get("Button.focusInputMap"); returns a null. Does anyone know of a way to easily clear components input maps some other way, or why the UIManager returns a null in this case? Any tips are appreciated, thanks beforehand.

推荐答案

我不是在附近尝试此操作的计算机，而是查看openjdk 7的源文件此处，默认情况下，映射看起来是固定的.

I'm not near a computer to try this, but looking at the openjdk 7 source here, the mapping looks fixed by default.

一种可能但有点棘手的解决方案是创建并安装装饰器 SynthStyleFactory ，用于在返回样式之前对其进行修改.

A possible, but slightly hacky, solution could be to create and install a decorator SynthStyleFactory that modifies the style prior to returning it.

我已经更新了以下代码示例，因为我有机会对其进行了测试.它不能以原始形式运行，但是更新后的代码对我有用.

I've updated the below code sample as I've had a chance to test this. It didn't work in it's original form, but the updated code worked for me.

import java.awt.BorderLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.HashMap;
import java.util.Map;

import javax.swing.JButton;
import javax.swing.JComponent;
import javax.swing.JFrame;
import javax.swing.UIDefaults;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
import javax.swing.plaf.synth.Region;
import javax.swing.plaf.synth.SynthLookAndFeel;
import javax.swing.plaf.synth.SynthStyle;
import javax.swing.plaf.synth.SynthStyleFactory;

import sun.swing.plaf.synth.DefaultSynthStyle;

public class LnFTest {

    public static void main(String[] args) throws UnsupportedLookAndFeelException{

        SynthLookAndFeel laf = new SynthLookAndFeel();
        laf.load(LnFTest.class.getResourceAsStream("laf.xml"), LnFTest.class);
        UIManager.setLookAndFeel(laf);
        SynthLookAndFeel.setStyleFactory(new MyStyleFactory(SynthLookAndFeel.getStyleFactory()));


        JButton button = new JButton("Test");
        button.addActionListener(new ActionListener(){
            public void actionPerformed(ActionEvent e){
                System.out.println("Action Performed");
            }
        });

        JFrame frame = new JFrame();
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setLayout(new BorderLayout());
        frame.add(button, BorderLayout.CENTER);
        frame.pack();

        frame.setVisible(true);

    }



}

class MyStyleFactory extends SynthStyleFactory {

    private SynthStyleFactory delegate;
    private Map overrides;

     public MyStyleFactory(SynthStyleFactory delegate){
         this.delegate = delegate;

         overrides = new HashMap();
         overrides.put("Button.focusInputMap", new UIDefaults.LazyInputMap(new Object[0]));
     }

     public SynthStyle getStyle(JComponent c, Region id) {
         SynthStyle style = delegate.getStyle(c, id);

         System.out.println("Style is a: " + style);

         if(style instanceof DefaultSynthStyle){
             ((DefaultSynthStyle)style).setData(overrides);
         }

         return style;

     }
}

我似乎无法在原始帖子中添加评论，因此只是为了澄清一下，在创建任何组件之前，我已经确认UIManager.get("Button.focusInputMap")仅使用简单的Synth返回null.可能Nimbus压倒了这种行为.

I don't seem able to add a comment to the original post, sojust to clarify, I had confirmed that UIManager.get("Button.focusInputMap") returned null with just plain Synth, prior to creating any components. Possibly Nimbus is overriding this behaviour.

 SynthLookAndFeel laf = new SynthLookAndFeel();
 UIManager.setLookAndFeel(laf);
 System.out.println(UIManager.get("Button.focusInputMap") == null);

这篇关于合成器外观中的默认按钮输入图?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！