Question

java中怎样实现到边界就自动隐藏？

实现窗体的自动隐藏，就像qq那样

Answer 1

// 该程序实现了，拖拽frame，遇到边缘则隐藏的功能。

import java.awt.Point;
import java.awt.Rectangle;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.event.MouseMotionAdapter;

import javax.swing.JFrame;
import javax.swing.Timer;

public class MyFrame implements ActionListener {

private static final long serialVersionUID = 1L;

private Rectangle rect;

// 窗体离屏幕左边的距离
private int left;

// 窗体离屏幕右边的距离；
private int right;

// 屏幕的宽度；
private int screenXX;

// 窗体离屏幕顶部的距离
private int top;

// 窗体的宽
private int width;

// 窗体的高
private int height;

// 鼠标在窗体的位置
private Point point;

private Timer timer = new Timer(10, this);

private int xx, yy;

private boolean isDraging = false;

private JFrame jFrame = new JFrame();

public MyFrame() {

super();
timer.start();
jFrame.setTitle("窗体在屏幕边缘隐藏演示");
jFrame.setSize(400, 300);
jFrame.setLocation(400, 300);
jFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
jFrame.setAlwaysOnTop(true);
jFrame.setUndecorated(true);
jFrame.setVisible(true);
moveFrame();
}

public void actionPerformed(ActionEvent e) {
left = jFrame.getLocationOnScreen().x;
top = jFrame.getLocationOnScreen().y;
width = jFrame.getWidth();
height = jFrame.getHeight();
screenXX = java.awt.Toolkit.getDefaultToolkit().getScreenSize().width;
right = screenXX - left - width;

// 获取窗体的轮廓
rect = new Rectangle(0, 0, width, height);
// 获取鼠标在窗体的位置
point = jFrame.getMousePosition();

if (left < 0 && isPtInRect(rect, point)) {
jFrame.setLocation(0, top); // 隐藏在左边，鼠标指到后显示窗体；
} else if (left > -5 && left < 5 && !(isPtInRect(rect, point))) {
jFrame.setLocation(left - width + 1, top); // 窗体移到左边便边缘隐藏到左边；
} else if ((top < 0 && left < 0) && isPtInRect(rect, point)) {//窗体在左上角；
jFrame.setLocation(0, 0);// 窗口隐藏了，鼠标指到他，就显示出来；
} else if ((top > -5 && top < 5) && (left > -5 && left < 5)
&& !(isPtInRect(rect, point))) {
// 当窗体的上边框与屏幕的顶端的距离小于5时 ，
// 并且鼠标不再窗体上将窗体隐藏到屏幕的顶端
jFrame.setLocation(left - width + 1, 1);
} else if ((top < 0) && isPtInRect(rect, point)) {
jFrame.setLocation(left, 0);// 窗口隐藏了，鼠标指到他，就显示出来；
} else if (top > -5 && top < 5 && !(isPtInRect(rect, point))) {
// 当窗体的上边框与屏幕的顶端的距离小于5时 ，
// 并且鼠标不再窗体上将窗体隐藏到屏幕的顶端
jFrame.setLocation(left, 1 - height);
} else if (right < 0 && isPtInRect(rect, point)) {
jFrame.setLocation(screenXX - width + 1, top);// 隐藏在右边，鼠标指到后显示；
} else if (right > -5 && right < 5 && !(isPtInRect(rect, point))) {
jFrame.setLocation(screenXX - 1, top); // 窗体移到屏幕右边边缘隐藏到右边；
} else if (right < 0 && top < 0 && isPtInRect(rect, point)) {//窗体在右上角；
jFrame.setLocation(screenXX - width + 1, 0);// 隐藏在右边，鼠标指到后显示；
} else if ((right > -5 && right < 5) && (top > -5 && top < 5)
&& !(isPtInRect(rect, point))) {
jFrame.setLocation(screenXX - 1, 1); // 窗体移到屏幕右边边缘隐藏到右边；
}
}

public boolean isPtInRect(Rectangle rect, Point point) {
if (rect != null && point != null) {
int x0 = rect.x;
int y0 = rect.y;
int x1 = rect.width;
int y1 = rect.height;
int x = point.x;
int y = point.y;

return x >= x0 && x < x1 && y >= y0 && y < y1;
}
return false;
}

public void moveFrame() {
jFrame.addMouseListener(new MouseAdapter() {
public void mousePressed(MouseEvent e) {
isDraging = true;
xx = e.getX();
yy = e.getY();
}

public void mouseReleased(MouseEvent e) {
isDraging = false;
}
});
jFrame.addMouseMotionListener(new MouseMotionAdapter() {
public void mouseDragged(MouseEvent e) {
if (isDraging) {
int left = jFrame.getLocation().x;
int top = jFrame.getLocation().y;
jFrame.setLocation(left + e.getX() - xx, top + e.getY()
- yy);

jFrame.repaint();
}
}
});
}

public static void main(String[] args) {
new MyFrame();
}
}