import java.awt.Color;
import java.awt.Dimension;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Shape;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.event.MouseMotionAdapter;
import java.awt.font.FontRenderContext;
import java.awt.font.TextHitInfo;
import java.awt.font.TextLayout;
import java.awt.geom.AffineTransform;
import java.awt.geom.Rectangle2D;
import javax.swing.JFrame;
import javax.swing.JPanel;
public class TextLayoutWithMouseClickDrag{
public static void main(String arg[]) {
JFrame frame = new JFrame();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.getContentPane().add("Center", new DisplayPanel());
frame.pack();
frame.setSize(new Dimension(400, 300));
frame.setVisible(true);
}
}
class DisplayPanel extends JPanel {
FontRenderContext frc = new FontRenderContext(null, false, false);
Font font = new Font("Arial", Font.PLAIN, 36);
Rectangle2D rect;
float rx, ry, rw, rh;
TextHitInfo hitInfo;
Color caretColor;
int hit1, hit2;
int w=400, h=200;
TextLayout layout = new TextLayout("j a v a 2 s . c o m", font, frc);
public DisplayPanel() {
setSize(400, 200);
addMouseListener(new MouseHandler());
addMouseMotionListener(new MouseMotionHandler());
rx = (float) (w / 2 - layout.getBounds().getWidth() / 2);
ry = (float) 3 * h / 4;
rw = (float) (layout.getBounds().getWidth());
rh = (float) (layout.getBounds().getHeight());
rect = new Rectangle2D.Float(rx, ry, rw, rh);
}
public void update(Graphics g) {
g.clearRect(0, 0, getWidth(), getHeight());
paintComponent(g);
}
public void paintComponent(Graphics g) {
super.paintComponent(g);
Graphics2D g2 = (Graphics2D) g;
AffineTransform at = AffineTransform.getTranslateInstance(rx, ry);
Shape hilight = layout.getLogicalHighlightShape(hit1, hit2);
hilight = at.createTransformedShape(hilight);
g2.setColor(Color.lightGray);
g2.fill(hilight);
g2.setColor(Color.black);
layout.draw(g2, rx, ry);
Shape[] caretShapes = layout.getCaretShapes(hit1);
Shape caret = at.createTransformedShape(caretShapes[0]);
g2.setColor(caretColor);
g2.draw(caret);
}
public int getHitLocation(int mouseX, int mouseY) {
hitInfo = layout.hitTestChar(mouseX, mouseY, rect);
return hitInfo.getInsertionIndex();
}
class MouseHandler extends MouseAdapter {
public void mouseClicked(MouseEvent e) {
caretColor = getForeground();
hit1 = getHitLocation(e.getX(), e.getY());
hit2 = hit1;
repaint();
}
public void mousePressed(MouseEvent e) {
caretColor = getForeground();
hit1 = getHitLocation(e.getX(), e.getY());
hit2 = hit1;
repaint();
}
public void mouseReleased(MouseEvent e) {
hit2 = getHitLocation(e.getX(), e.getY());
repaint();
}
}
class MouseMotionHandler extends MouseMotionAdapter {
public void mouseDragged(MouseEvent e) {
caretColor = getBackground();
hit2 = getHitLocation(e.getX(), e.getY());
repaint();
}
}
}