I am trying to make a JFrame appear on mousePressed Location but I keep failing and it get's annoying :( Any ideas what isn't working?
import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
public class SSCCE
{
@SuppressWarnings("static-access")
public static void getInputData()
{
final JFrame frame = new JFrame();
frame.setDefaultCloseOperation(frame.DISPOSE_ON_CLOSE);
JLabel emptyLabel = new JLabel("Test");
frame.getContentPane().add(emptyLabel, BorderLayout.CENTER);
frame.setSize(new Dimension(375, 100));
MouseAdapter ml = new MouseAdapter()
{
@Override
public void mousePressed(MouseEvent me)
{
开发者_JAVA百科 frame.setLocation(me.getX(), me.getY());
}
@Override
public void mouseDragged(MouseEvent me)
{
frame.setLocation(me.getX(), me.getY());
}
};
frame.getContentPane().addMouseListener(ml);
frame.getContentPane().addMouseMotionListener(ml);
frame.setVisible(true);
}
public static void main(String args[])
{
JFrame test = new JFrame();
JButton but = new JButton("Click me");
but.addActionListener(
new ActionListener()
{
public void actionPerformed(ActionEvent e)
{
getInputData();
}
});
test.getContentPane().add(but, BorderLayout.CENTER);
test.setSize(500, 500);
test.setVisible(true);
}
}
Use the SwingUtilities
methods convertPointToScreen()
and convertPointFromScreen()
to transform the MouseEvent
coordinates.
Addendum: Alternatively, calculate the offset from getLocationOnScreen()
, which is "the component's top-left corner in the screen's coordinate space."
Addendum: To position the new frame relative to the original mouse click, add a mouse listener to the parent frame instead of a button; use the coordinates to position the new frame, as shown below.
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class SSCCE {
public static void getInputData(MouseEvent e) {
final JFrame frame = new JFrame();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JLabel emptyLabel = new JLabel("Test", JLabel.CENTER);
frame.getContentPane().add(emptyLabel, BorderLayout.CENTER);
frame.setPreferredSize(new Dimension(375, 100));
MouseAdapter ma = new MouseAdapter() {
Point local, global;
Point delta = new Point();
@Override
public void mousePressed(MouseEvent me) {
local = me.getPoint();
}
@Override
public void mouseDragged(MouseEvent me) {
delta.setLocation(
me.getX() - local.x, me.getY() - local.y);
global = frame.getLocationOnScreen();
global.setLocation(
global.x + delta.x, global.y + delta.y);
frame.setLocation(global.x, global.y);
}
};
frame.getContentPane().addMouseListener(ma);
frame.getContentPane().addMouseMotionListener(ma);
frame.pack();
frame.setLocation(e.getLocationOnScreen());
frame.setVisible(true);
}
public static void main(String args[]) {
JFrame frame = new JFrame();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setPreferredSize(new Dimension(640, 480));
frame.add(new JLabel("Click me", JLabel.CENTER));
frame.addMouseListener(new MouseAdapter() {
@Override
public void mousePressed(MouseEvent e) {
getInputData(e);
}
});
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
}
Previously,
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class SSCCE {
public static void getInputData() {
final JFrame frame = new JFrame();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JLabel emptyLabel = new JLabel("Test", JLabel.CENTER);
frame.getContentPane().add(emptyLabel, BorderLayout.CENTER);
frame.setPreferredSize(new Dimension(375, 100));
MouseAdapter ma = new MouseAdapter() {
Point local = new Point();
Point delta = new Point();
Point global = new Point();
@Override
public void mousePressed(MouseEvent me) {
local = me.getPoint();
}
@Override
public void mouseDragged(MouseEvent me) {
delta.setLocation(
me.getX() - local.x,
me.getY() - local.y);
global = frame.getLocationOnScreen();
global.setLocation(global.x + delta.x, global.y + delta.y);
frame.setLocation(global.x, global.y);
}
};
frame.getContentPane().addMouseListener(ma);
frame.getContentPane().addMouseMotionListener(ma);
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
public static void main(String args[]) {
JFrame frame = new JFrame();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JButton but = new JButton("Click me");
but.addActionListener(
new ActionListener() {
public void actionPerformed(ActionEvent e) {
getInputData();
}
});
frame.getContentPane().add(but, BorderLayout.CENTER);
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
}
精彩评论