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法律研究在 Java Swing 中创建渐变半透明窗口
借助 JDK 7，我们可以非常轻松地使用 swing 创建基于渐变的半透明窗口。以下是制作基于渐变的半透明窗口所需步骤。
首先使 JFrame 的背景透明。
frame.setBackground(new Color(0,0,0,0));
创建一个渐变画布，并填充面板。
JPanel panel = new javax.swing.JPanel() {
protected void paintComponent(Graphics g) {
Paint p = new GradientPaint(0.0f, 0.0f, new Color(R, G, B, 0),
getWidth(), getHeight(), new Color(R, G, B, 255), true);
Graphics2D g2d = (Graphics2D)g;
g2d.setPaint(p);
g2d.fillRect(0, 0, getWidth(), getHeight());
}
}将面板分配为框架的内容窗格。
frame.setContentPane(panel);
示例
请看以下具有基于渐变的半透明效果的窗口示例。
import java.awt.Color;
import java.awt.GradientPaint;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.GridBagLayout;
import java.awt.Paint;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.SwingUtilities;
import javax.swing.UnsupportedLookAndFeelException;
public class Tester {
public static void main(String[] args)
throws ClassNotFoundException, InstantiationException,
IllegalAccessException, UnsupportedLookAndFeelException {
JFrame.setDefaultLookAndFeelDecorated(true);
// Create the GUI on the event-dispatching thread
SwingUtilities.invokeLater(new Runnable() {
@Override
public void run() {
createWindow();
}
});
}
private static void createWindow() {
JFrame frame = new JFrame("Translucent Window");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
createUI(frame);
frame.setVisible(true);
}
private static void createUI(JFrame frame){
frame.setLayout(new GridBagLayout());
frame.setSize(200, 200);
frame.setLocationRelativeTo(null);
frame.setBackground(new Color(0,0,0,0));
JPanel panel = new javax.swing.JPanel() {
protected void paintComponent(Graphics g) {
if (g instanceof Graphics2D) {
final int R = 100;
final int G = 100;
final int B = 100;
Paint p =
new GradientPaint(0.0f, 0.0f, new Color(R, G, B, 0),
getWidth(), getHeight(), new Color(R, G, B, 255), true);
Graphics2D g2d = (Graphics2D)g;
g2d.setPaint(p);
g2d.fillRect(0, 0, getWidth(), getHeight());
} else {
super.paintComponent(g);
}
}
};
panel.setLayout(new GridBagLayout());
panel.add(new JButton("Hello World"));
frame.setContentPane(panel);
}
}输出
更新于：19-6-2020
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