我有一个JPanel窗口,上面画了一些东西。我试图弄清楚如何像一个简单的闪光灯一样闪屏,以引起用户的注意?我之前发现了一个问题,但它对我想做的事情没有用。我有一个连续循环,根据一些变量更新屏幕。我希望屏幕在某一点闪烁,然后恢复正常。
谢谢!
答案 0 :(得分:4)
您可以使用Trident插入班级中的各种属性。这是一个动画面板背景的演示:
import java.awt.Color;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.SwingUtilities;
import org.pushingpixels.trident.Timeline;
import org.pushingpixels.trident.Timeline.RepeatBehavior;
public class TestPanel {
private static void createAndShowGUI() {
JFrame frame = new JFrame();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JPanel panel = new JPanel();
panel.add(new JLabel("Some text"));
frame.add(panel);
frame.pack();
frame.setVisible(true);
final Timeline timeline = new Timeline(panel);
timeline.addPropertyToInterpolate("background", panel.getBackground(),
Color.red);
timeline.setDuration(1000);
timeline.playLoop(5, RepeatBehavior.REVERSE);
}
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
public void run() {
createAndShowGUI();
}
});
}
}
编辑:自动隐藏弹出窗口的评论
您可以使用计时器隐藏弹出窗口,例如:
import javax.swing.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
public class TempPopup {
public static void main(String[] args) {
JOptionPane pane = new JOptionPane("Message",
JOptionPane.INFORMATION_MESSAGE);
final JDialog dialog = pane.createDialog(null, "Title");
Timer timer = new Timer(2000, new ActionListener() {
public void actionPerformed(ActionEvent e) {
dialog.setVisible(false);
dialog.dispose();
}
});
timer.setRepeats(false);
timer.start();
dialog.setVisible(true);
dialog.dispose();
}
}
答案 1 :(得分:1)
使用玻璃窗格组件,如下面的示例演示:
import java.awt.Color;
import java.awt.Graphics;
import javax.swing.JComponent;
import javax.swing.JFrame;
import javax.swing.JPanel;
public class Demo {
public static void main(String[] args) {
JFrame frame = new JFrame();
final JPanel panel = new JPanel();
frame.add(panel);
JComponent flashPane = new JComponent() {
@Override
public void paint(Graphics g) {
// Add code to draw whatever you want to grab attention here
g.setColor(Color.CYAN);
g.fillRect(0, 0, panel.getWidth(), panel.getHeight());
super.paint(g);
}
};
panel.getRootPane().setGlassPane(flashPane);
frame.setBounds(0, 0, 200, 200);
frame.setVisible(true);
// Sample loop to flash every 2 seconds
while(true) {
try {
Thread.sleep(2000);
flashPane.setVisible(true);
Thread.sleep(200);
flashPane.setVisible(false);
} catch(Exception ex) {
}
}
}
}
答案 2 :(得分:-1)
我建议像这样的伪代码:
if(your flash condition is true){
yourFrame.visible = False; // no longer display the frame.
Thread.sleep(500); // waits for half a second.
yourFrame.visible = True; // show the frame again.
}
您可能需要验证视图(框架),以确保在线程唤醒后再次显示模型中可能发生的任何更改(变量等)。