Drag and Drop in java
Tue Nov 11, 2008 8:39 pm
Drag and Drop in java
- Code:
import java.awt.*;
import javax.swing.*;
import java.awt.event.*;
import java.awt.geom.*;
import javax.swing.border.TitledBorder;
public class MouseDragAndDrop extends JFrame {
Canvas1 canvas;
JLabel label;
public MouseDragAndDrop() {
super();
Container container = getContentPane();
canvas = new Canvas1();
container.add(canvas);
JPanel panel = new JPanel();
panel.setLayout(new GridLayout(1, 2));
label = new JLabel("");
panel.add(label);
container.add(panel, BorderLayout.SOUTH);
setSize(600,300);
setVisible(true);
}
public static void main(String arg[]) {
new MouseDragAndDrop();
}
class Canvas1 extends JPanel {
double p, q, width, height;
int p1, q1, p2, q2;
Rectangle2D rect1,rect2;
Rectangle2D rectangle;
Cursor cursor;
public Canvas1() {
p = 25;
q = 25;
width = 90;
height = 70;
addMouseListener(new EventMouseListener());
addMouseMotionListener(new EventMouseMotionListener());
}
public void paint(Graphics g) {
Graphics2D g2 = (Graphics2D) g;
rect1 = new Rectangle2D.Double(p, q, width, height);
g2.draw(rect1);
if (rectangle != null) {
drawSquares(g2, rectangle);
}
if (cursor != null)
setCursor(cursor);
}
public void drawSquares(Graphics2D g2, Rectangle2D rect) {
double p = rect.getX();
double q = rect.getY();
double width = rect.getWidth();
double height = rect.getHeight();
g2.setColor(Color.black);
}
class EventMouseListener extends MouseAdapter {
public void mousePressed(MouseEvent event) {
rect2 = rect1;
rectangle = rect1.getBounds2D();
display(rect2);
p1 = event.getX();
q1 = event.getY();
}
public void mouseReleased(MouseEvent event) {
rectangle = rect1.getBounds2D();
rect2 = rect1;
display(rect2);
}
public void mouseClicked(MouseEvent event) {
rect2 = rect1;
rectangle = rect1.getBounds2D();
display(rect2);
}
}
class EventMouseMotionListener extends MouseMotionAdapter {
public void mouseDragged(MouseEvent event) {
if (rect1.contains(event.getX(), event.getY())) {
rectangle = null;
rect2 = rect1;
p2 = event.getX();
q2 = event.getY();
p = p + p2 - p1;
q = q + q2 - q1;
p1 = p2;
q1 = q2;
}
if (rect2 != null)
display(rect2);
canvas.repaint();
}
public void mouseMoved(MouseEvent event) {
cursor = Cursor.getPredefinedCursor(Cursor.HAND_CURSOR);
}
}
public void display(Shape shape) {
double p = rect2.getX();
double q = rect2.getY();
double width= rect2.getWidth();
double height = rect2.getHeight();
String st = "(" + Double.toString(p)+","+Double.toString(q) + ")";
String sizeString = "(" + Double.toString(width) + ","+
Double.toString(height) + ")";
label.setText(st);
}
}
}
- Attachments
-
- first output
- drag.gif (1.4 KiB) Viewed 21795 times
-
- When you drag the rectangle and move, output will be
- drag1.gif (5.87 KiB) Viewed 21791 times
Re: Drag and Drop in java
Wed Nov 16, 2011 5:03 pm
hi,
thank you for the code.But,how can we remove the dragged squares while we drag the object? i tried using flags but repaint gets called again .I want to show the square only when i release my mouse.Any pointer would be helpful.
thank you for the code.But,how can we remove the dragged squares while we drag the object? i tried using flags but repaint gets called again .I want to show the square only when i release my mouse.Any pointer would be helpful.
Topic Tags
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