我正在尝试创建一个具有可互换外观组件的自定义 JButton
。使用 CardLayout
作为切换机制,我在 JComponent
(即皮肤组件)与 JButton
齐平时遇到困难。
例如,
import java.awt.CardLayout;
import java.awt.Color;
import java.awt.FlowLayout;
import java.awt.Graphics;
import javax.swing.JButton;
import javax.swing.JComponent;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.SwingUtilities;
public final class SkinsDemo {
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable(){
@Override
public void run() {
createAndShowGUI();
}
});
}
private static void createAndShowGUI(){
final JFrame frame = new JFrame();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setLayout(new FlowLayout());
frame.add(new JSkinnableButton());
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
private static final class JSkinnableButton extends JButton{
private static final long serialVersionUID = -5167346969674067012L;
protected JSkinnableButton(){
super();
setLayout(new CardLayout()); // for interchangeability
add(new JSkinComponent(), "Skin");
}
}
private static final class JSkinComponent extends JComponent{
private static final long serialVersionUID = 2172542865655802012L;
protected JSkinComponent(){
super();
setOpaque(true);
setLayout(new FlowLayout()); // need layout manager
setBackground(Color.CYAN);
add(new JLabel("Skin"));
}
@Override
protected void paintComponent(Graphics g){
Graphics gCopy = g.create();
gCopy.setColor(getBackground());
gCopy.fillRect(0, 0, getWidth(), getHeight());
gCopy.dispose();
}
}
}
这是一个非常粗略的例子,但我认为它清楚地表达了我的意图。
而这个 JButton
将监听来自域对象的属性更改事件,并相应地更新它的显示。
最佳答案
JSkinnableButton
中按钮的边距和边框占用了空间。
protected JSkinnableButton(){
super();
setLayout(new CardLayout()); // for interchangeability
setMargin(new Insets(0,0,0,0));
setBorder(BorderFactory.createEmptyBorder());
add(new JSkinComponent(), "Skin");
}
现在,尤其是边框,是使按钮看起来像按钮的一部分,但我假设您已经为此制定了计划...
关于java - JButton 的可互换 JComponent 外观,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/8213211/