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package ZoomScrollPaneFoireux;
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Rectangle;
import java.awt.Shape;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;
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.JScrollPane;
public class Main {
public static void main(String[] args) {
new DrawingTopComponent();
}
private static class DrawingTopComponent extends JFrame {
JScrollPane zoomScrollPane;
static XDrawPane drawPane;
static ZoomPane zoomPane;
public DrawingTopComponent() {
setDefaultCloseOperation(EXIT_ON_CLOSE);
initContentPane();
pack();
setLocationRelativeTo(null);
setVisible(true);
setBounds(0, 0, 400, 400);
}
void initContentPane() {
setLayout(new BorderLayout());
drawPane = new XDrawPane();
zoomScrollPane = new JScrollPane();
add(zoomScrollPane, BorderLayout.CENTER);
zoomPane = new ZoomPane();
zoomScrollPane.setViewportView(zoomPane);
zoomPane.setLocation(0, 0);
zoomPane.add(drawPane);
drawPane.setBounds(0, 0, 300, 300);
Item n = new Item();
drawPane.add(n);
n.addMouseListener(n);
n.setLocation(100, 100);
validate();
validateTree();
}
public class ZoomPane extends JComponent implements MouseMotionListener, KeyListener {
public ZoomPane() {
super();
addKeyListener(this);
addMouseMotionListener(this);
}
double zoomFactor = 1.2;
double zoom = 1.0;
public void zoomMore() {
zoom *= zoomFactor;
setPreferredSize(new Dimension((int) (drawPane.getWidth() * zoom), (int) (drawPane.getHeight() * zoom)));
setBounds(0, 0, (int) (drawPane.getWidth() * zoom), (int) (drawPane.getHeight() * zoom));
}
public void zoomLess() {
zoom /= zoomFactor;
setPreferredSize(new Dimension((int) (drawPane.getWidth() * zoom), (int) (drawPane.getHeight() * zoom)));
setBounds(0, 0, (int) (drawPane.getWidth() * zoom), (int) (drawPane.getHeight() * zoom));
}
public void paint(Graphics g) {
Graphics2D g2d = (Graphics2D) g;
g2d.scale(zoom, zoom);
Rectangle r = g2d.getClipBounds();
g2d.setPaint(Color.blue);
g2d.drawRect(r.x + 1, r.y + 1, r.width - 2, r.height - 2);
g2d.setClip(r.x, r.y, r.width + 100, r.height + 100); // useless to extend clip.
super.paint(g2d);
}
public void mouseMoved(MouseEvent e) {
requestFocusInWindow();
}
public void keyPressed(KeyEvent ke) {
if (ke.getKeyChar() == '+') {
zoomPane.zoomMore();
}
if (ke.getKeyChar() == '-') {
zoomPane.zoomLess();
}
}
public void mouseDragged(MouseEvent e) {
}
public void keyTyped(KeyEvent e) {
}
public void keyReleased(KeyEvent e) {
}
}
public static class XDrawPane extends JComponent {
public XDrawPane() {
super();
}
public void paint(Graphics g) {
g.setColor(Color.gray);
g.drawRect(0, 0, getWidth() - 1, getHeight() - 1);
super.paint(g);
}
}
public class Item extends JComponent implements MouseListener {
public Item() {
super();
addMouseListener(this);
setSize(80, 80);
}
boolean highlight = false;
public void paintComponent(java.awt.Graphics g) {
g.setColor(Color.WHITE);
g.fillRect(0, 0, getWidth() - 1, getHeight() - 1);
if (highlight) {
g.setColor(Color.red);
} else {
g.setColor(Color.BLACK);
}
g.drawRect(0, 0, getWidth() - 1, getHeight() - 1);
super.paintComponent(g);
}
public void mouseEntered(MouseEvent e) {
highlight = true;
repaint();
}
public void mouseExited(MouseEvent e) {
highlight = false;
repaint();
}
public void mouseClicked(MouseEvent e) {
}
public void mousePressed(MouseEvent e) {
}
public void mouseReleased(MouseEvent e) {
}
}
}
} |
