我做了一个简单的JFrame
(320 X 64)我在屏幕顶部显示(未修饰(真实);)。是否有一种简单的方法可以在屏幕上方绘制JFrame
,将其向下滑动,等待几秒钟,然后重新启动并进行处理?
答案 0 :(得分:2)
您需要使用Swing Timer
和JFrame#setLocation(int x,int y)
这是我做的一个小例子:
它只是启动一个Swing Timer
来移动未修饰的 JFrame
从向下方向开始坐标(在y轴上),直到它到达屏幕的底部通过GraphicsEnvironment#getMaximumWindowBounds()
获得。然后开始新的Swing Timer
2500毫秒后,将JFrame
移回屏幕顶部而不是dispose()
JFrame
完成后:
import java.awt.Dimension;
import java.awt.GraphicsEnvironment;
import java.awt.event.ActionEvent;
import javax.swing.AbstractAction;
import javax.swing.JFrame;
import javax.swing.SwingUtilities;
import javax.swing.Timer;
public class AnimateJFrame {
private JFrame frame;
public AnimateJFrame() {
initComponents();
}
private void initComponents() {
frame = new JFrame() {
@Override
public Dimension getPreferredSize() {
return new Dimension(300, 300);
}
};
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setUndecorated(true);
frame.pack();
frame.setVisible(true);
createAndStartDownwardTimer(frame);
}
private void createAndStartDownwardTimer(final JFrame frame) {
new Timer(25, new AbstractAction() {
int screenHeight = GraphicsEnvironment.getLocalGraphicsEnvironment().getMaximumWindowBounds().height;
int y = frame.getY();
@Override
public void actionPerformed(ActionEvent ae) {
if (frame.getY() + frame.getHeight() < screenHeight) {
y += 10;
frame.setLocation(frame.getX(), y);
} else {
createAndStartUpwardTimer(2500 - 15);//15milis approx latency
((Timer) ae.getSource()).stop();
}
}
}).start();
}
private void createAndStartUpwardTimer(int initialDelay) {
Timer t = new Timer(25, new AbstractAction() {
int y = GraphicsEnvironment.getLocalGraphicsEnvironment().getMaximumWindowBounds().height - frame.getHeight();
@Override
public void actionPerformed(ActionEvent ae) {
if (frame.getY() > 0) {
y -= 10;
frame.setLocation(frame.getX(), y);
} else {
frame.dispose();
((Timer) ae.getSource()).stop();
}
}
});
t.setInitialDelay(initialDelay);
t.start();
}
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
@Override
public void run() {
new AnimateJFrame();
}
});
}
}