如何在按下鼠标时更改 JButton 颜色? [英] How to change a JButton color on mouse pressed?

问题描述

我想根据鼠标事件(鼠标进入、退出、按下等)自定义颜色.所以为了实现这一点，我写了下面的代码.一切都很好，除了鼠标按下事件的情况，它什么都不做.它只有在我像这样 UIManager.put("Button.select", Color.red); 覆盖 UIManager 中的颜色时才有效.UIManager 的问题是它会为我的所有按钮更改.

I want to have custom colors according to the mouse events (mouse enter, exit, pressed, etc). So to accomplish this, I wrote the code bellow. It is fine for everything, except on the case of the mouse pressed event, which does nothing. It only works if I override the color in the UIManager like this UIManager.put("Button.select", Color.red);. Problem with the UIManager, is that it will change for all my buttons.

谁能告诉我我可能做错了什么或者完成我正在尝试做的事情的最佳方法是什么?

Can anyone tell me what I might be doing wrong or what is the best approach to accomplish what I'm trying to do?

我的代码:

final JButton btnSave = new JButton("Save");

btnSave.setForeground(new Color(0, 135, 200).brighter());
btnSave.setHorizontalTextPosition(SwingConstants.CENTER);
btnSave.setBorder(null);
btnSave.setBackground(new Color(3, 59, 90));

btnSave.addMouseListener(new MouseListener() {
    @Override
    public void mouseReleased(MouseEvent e) {
        btnSave.setBackground(new Color(3, 59, 90));
    }

    @Override
    public void mousePressed(MouseEvent e) {
        // Not working :(
        btnSave.setBackground(Color.pink);
    }

    @Override
    public void mouseExited(MouseEvent e) {
        btnSave.setBackground(new Color(3, 59, 90));
    }

    @Override
    public void mouseEntered(MouseEvent e) {
        btnSave.setBackground(new Color(3, 59, 90).brighter());
    }

    @Override
    public void mouseClicked(MouseEvent e) {
        btnSave.setBackground(new Color(3, 59, 90).brighter());
    }
});

因此，我没有使用鼠标侦听器，而是按照 mKorbel 的建议使用 ChangeListener 和 ButtonModel.使用此代码，除了在按钮外按下并拖动时，我仍然没有观察到在按钮中按下鼠标的任何变化.有什么想法吗?

So, instead of mouse listener, I'm using ChangeListener and ButtonModel as suggested by mKorbel. With this code I'm still not observing any changes on mouse pressed in the button except when I press and drag outside the button. Any thoughts?

btnSave.getModel().addChangeListener(new ChangeListener() {

    @Override
    public void stateChanged(ChangeEvent e) {
        ButtonModel model = (ButtonModel) e.getSource();

        if (model.isRollover()) {
            btnSave.setBackground(new Color(3, 59, 90).brighter());
        } else if (model.isPressed()) {
            btnSave.setBackground(Color.BLACK);
        } else {
            btnSave.setBackground(new Color(3, 59, 90));
        }
    }
});

推荐答案

这个问题是由于 JButton 默认填充了它的内容区域，Metal L&F 会自动用它内部选择的颜色填充它按下按钮时.

The problem is caused by the fact that a JButton has its content area filled by default and that the Metal L&F will automatically fill it with its internal chosen color when button is pressed.

最好的办法是扩展 JButton 以创建您自己的按钮，禁用内容区域填充，并为自己绘制按钮的背景.

Best thing to do, is to extend JButton to create your own button, disable content area filled, and paint yourself the background of the button.

这是一个小演示(不确定它是否适用于其他 L&F，甚至很确定它不能):

Here is a small demo for that (not sure it works on other L&F, even pretty sure it does not):

import java.awt.Color;
import java.awt.Graphics;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.SwingConstants;
import javax.swing.SwingUtilities;

public class TestButton {

    class MyButton extends JButton {

        private Color hoverBackgroundColor;
        private Color pressedBackgroundColor;

        public MyButton() {
            this(null);
        }

        public MyButton(String text) {
            super(text);
            super.setContentAreaFilled(false);
        }

        @Override
        protected void paintComponent(Graphics g) {
            if (getModel().isPressed()) {
                g.setColor(pressedBackgroundColor);
            } else if (getModel().isRollover()) {
                g.setColor(hoverBackgroundColor);
            } else {
                g.setColor(getBackground());
            }
            g.fillRect(0, 0, getWidth(), getHeight());
            super.paintComponent(g);
        }

        @Override
        public void setContentAreaFilled(boolean b) {
        }

        public Color getHoverBackgroundColor() {
            return hoverBackgroundColor;
        }

        public void setHoverBackgroundColor(Color hoverBackgroundColor) {
            this.hoverBackgroundColor = hoverBackgroundColor;
        }

        public Color getPressedBackgroundColor() {
            return pressedBackgroundColor;
        }

        public void setPressedBackgroundColor(Color pressedBackgroundColor) {
            this.pressedBackgroundColor = pressedBackgroundColor;
        }
    }

    protected void createAndShowGUI() {
        JFrame frame = new JFrame("Test button");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        final MyButton btnSave = new MyButton("Save");
        btnSave.setForeground(new Color(0, 135, 200).brighter());
        btnSave.setHorizontalTextPosition(SwingConstants.CENTER);
        btnSave.setBorder(null);
        btnSave.setBackground(new Color(3, 59, 90));
        btnSave.setHoverBackgroundColor(new Color(3, 59, 90).brighter());
        btnSave.setPressedBackgroundColor(Color.PINK);
        frame.add(btnSave);
        frame.setSize(200, 200);
        frame.setVisible(true);
    }

    public static void main(String[] args) {
        SwingUtilities.invokeLater(new Runnable() {
            @Override
            public void run() {
                new TestButton().createAndShowGUI();
            }
        });

    }

}

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