[英]Change jButton transparancy /opacity/alpha
I have custom class in Java that extends JButton and have an image background. 我在Java中有自定义类,该类扩展了JButton并具有图像背景。 I can set alpha with this function in the class:
我可以在课堂上使用此功能设置alpha:
@Override
public void paint(Graphics g)
{
Graphics2D g2 = (Graphics2D) g.create();
g2.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_OVER, (float) 0.5));
super.paint(g2);
g2.dispose();
}
How can set getter and setter to this function so I can control the opacity from the class that creates the button? 如何将getter和setter设置为此功能,以便我可以从创建按钮的类中控制不透明度? I need something like this:
我需要这样的东西:
MyJButton myJbtn = new MyJButton();
myJbtn.setOpacity(0.5);
Create an instance field opacity
in your button class, then create setter and getters: 在您的按钮类中创建实例字段
opacity
,然后创建setter和getter:
private float opacity;
//......
public setOpacity(float opacity) {
this.opacity = opacity;
}
public void getOpacity(){
return this.opacity
}
Then class repaint after setting any opacity to the button: 然后,在对按钮设置任何不透明度之后,类会重新绘制:
MyJButton myJbtn = new MyJButton();
myJbtn.setOpacity(0.5);
myJbtn.repaint();
The setOpacity
method can be implemented like this: setOpacity
方法可以这样实现:
public void setOpacity(float opacity) {
this.opacity = opacity;
repaint();
}
opacity
is an instance field that stores the current opacity. opacity
是存储当前不透明度的实例字段。 It is used by paint
for the opacity value. paint
将其用作不透明度值。
You may also want a getOpacity
method, which is not strictly required. 您可能还需要
getOpacity
方法,这不是严格要求的。
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