Drag and move a frame from its content area : Frame « Swing JFC « Java

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Java » Swing JFC » Frame 




Drag and move a frame from its content area
    

import java.awt.Color;
import java.awt.Container;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.Point;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.awt.event.MouseMotionListener;

import javax.swing.JComponent;
import javax.swing.JFrame;
import javax.swing.JPanel;

public class Main extends JPanel {
  public void paintComponent(Graphics g) {
    g.setColor(Color.black);
    g.fillRect(00, getWidth(), getHeight());
  }

  public static void main(String[] args) {
    JFrame frame = new JFrame();
    frame.setPreferredSize(new Dimension(300280));

    Main ch = new Main();
    frame.getContentPane().add(ch);
    frame.setUndecorated(true);

    MoveMouseListener mml = new MoveMouseListener(ch);
    ch.addMouseListener(mml);
    ch.addMouseMotionListener(mml);

    frame.pack();
    frame.setVisible(true);
  }
}

class MoveMouseListener implements MouseListener, MouseMotionListener {
  JComponent target;
  Point start_drag;
  Point start_loc;

  public MoveMouseListener(JComponent target) {
    this.target = target;
  }

  public static JFrame getFrame(Container target) {
    if (target instanceof JFrame) {
      return (JFrametarget;
    }
    return getFrame(target.getParent());
  }

  Point getScreenLocation(MouseEvent e) {
    Point cursor = e.getPoint();
    Point target_location = this.target.getLocationOnScreen();
    return new Point((int) (target_location.getX() + cursor.getX()),
        (int) (target_location.getY() + cursor.getY()));
  }

  public void mouseClicked(MouseEvent e) {
  }

  public void mouseEntered(MouseEvent e) {
  }

  public void mouseExited(MouseEvent e) {
  }

  public void mousePressed(MouseEvent e) {
    this.start_drag = this.getScreenLocation(e);
    this.start_loc = this.getFrame(this.target).getLocation();
  }

  public void mouseReleased(MouseEvent e) {
  }

  public void mouseDragged(MouseEvent e) {
    Point current = this.getScreenLocation(e);
    Point offset = new Point((intcurrent.getX() (intstart_drag.getX(),
        (intcurrent.getY() (intstart_drag.getY());
    JFrame frame = this.getFrame(target);
    Point new_location = new Point(
        (int) (this.start_loc.getX() + offset.getX())(int) (this.start_loc
            .getY() + offset.getY()));
    frame.setLocation(new_location);
  }

  public void mouseMoved(MouseEvent e) {
  }
}

   
    
    
    
  














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20.Exiting an Application When a JFrame Is Closed
21.Use Component listener to ensure frame visibilities
22.Setting the Icon for a Frame
23.Removing the Title Bar of a Frame
24.Setting the Bounds for a Maximized Frame
25.Iconifies a frame; the maximized bits are not affected.
26.Deiconifies a frame; the maximized bits are not affected.
27.Hiding a Frame When Its Close Button Is Clicked
28.Exiting an Application When a Frame Is Closed
29.Getting All Created Frames in an Application
30.Maximizes a frame; the iconified bit is not affected
31.Making a Frame Non-Resizable: use setResizable(false) to freeze a frame's size.
32.Determining When a Frame or Window Is Opened or Closed
33.Determining When a Frame or Window Is Iconized or Maximized
34.Determining When a Component Has Been Made Visible, Moved, or Resized
35.Get the JFrame of a component
36.Disable JFrame close button
37.Handle JFrame window events
38.Define the default close operation of a JFrame to EXIT_ON_CLOSE, application will exit by calling System.exit()
39.Center a JFrame
40.Creating Frames with a background image
41.Preventing a Window from Gaining the Focus
42.Create undecorated frame
43.Make a JFrame always visible
44.Maximize a JFrame
45.Close a JFrame under condition
46.Creating a Titleless and Borderless JFrame
47.FrameDemo2.java shows off the window decoration features added in 1.4
48.JFrame that closes when someone presses the ESC key
49.Show the given frame as modal to the specified owner
50.Set Frame Location By Platform
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