Java 更改jButton透明度/不透明度/alpha
我有一个Java自定义类,它扩展了JButton并具有图像背景。我可以在类中使用此函数设置alpha:Java 更改jButton透明度/不透明度/alpha,java,swing,transparency,jbutton,alpha-transparency,Java,Swing,Transparency,Jbutton,Alpha Transparency,我有一个Java自定义类,它扩展了JButton并具有图像背景。我可以在类中使用此函数设置alpha: @Override public void paint(Graphics g) { Graphics2D g2 = (Graphics2D) g.create(); g2.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_OVER, (float) 0.5)); super.paint(
@Override
public void paint(Graphics g)
{
Graphics2D g2 = (Graphics2D) g.create();
g2.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_OVER, (float) 0.5));
super.paint(g2);
g2.dispose();
}
如何将getter和setter设置为这个函数,以便从创建按钮的类控制不透明度?
我需要这样的东西:
MyJButton myJbtn = new MyJButton();
myJbtn.setOpacity(0.5);
public void setOpacity(float opacity) {
this.opacity = opacity;
repaint();
}
在button类中创建一个实例字段
opacity
,然后创建setter和getter:
private float opacity;
//......
public setOpacity(float opacity) {
this.opacity = opacity;
}
public void getOpacity(){
return this.opacity
}
然后在为按钮设置任何不透明度后重新绘制类:
MyJButton myJbtn = new MyJButton();
myJbtn.setOpacity(0.5);
myJbtn.repaint();
setOpacity
方法可以如下实现:
MyJButton myJbtn = new MyJButton();
myJbtn.setOpacity(0.5);
public void setOpacity(float opacity) {
this.opacity = opacity;
repaint();
}
opacity
是存储当前不透明度的实例字段。它由paint
用于不透明度值
您可能还需要一个
getOpacity
方法,这不是严格要求的。但是我如何调用@Override public void paint(Graphics g)?@DanM:通过调用按钮myJbtn.repaint()