|
import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.RenderingHints;
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 javax.swing.JFrame;
import javax.swing.JPanel;
public class Highlights extends JPanel {
private TextLayout textLayout;
private TextHitInfo firstHit, secondHit;
private int x = 40, y = 80;
public Highlights(){
addMouseListener(new MouseAdapter() {
public void mousePressed(MouseEvent me) {
firstHit = textLayout.hitTestChar(me.getX() - x, me.getY()
- y);
secondHit = null;
}
public void mouseReleased(MouseEvent me) {
secondHit = textLayout.hitTestChar(me.getX() - x, me.getY()
- y);
repaint();
}
});
addMouseMotionListener(new MouseMotionAdapter() {
public void mouseDragged(MouseEvent me) {
secondHit = textLayout.hitTestChar(me.getX() - x, me.getY()
- y);
repaint();
}
});
}
public void paint(Graphics g) {
Graphics2D g2 = (Graphics2D) g;
g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
RenderingHints.VALUE_ANTIALIAS_ON);
g2.setRenderingHint(RenderingHints.KEY_FRACTIONALMETRICS,
RenderingHints.VALUE_FRACTIONALMETRICS_ON);
String s = "Drag the text to highlight Java Source and Support.";
Font font = new Font("Serif", Font.PLAIN, 32);
if (textLayout == null) {
FontRenderContext frc = g2.getFontRenderContext();
textLayout = new TextLayout(s, font, frc);
}
// Draw the highlight.
if (firstHit != null && secondHit != null) {
Shape base = textLayout.getLogicalHighlightShape(firstHit
.getInsertionIndex(), secondHit.getInsertionIndex());
AffineTransform at = AffineTransform.getTranslateInstance(x, y);
Shape highlight = at.createTransformedShape(base);
g2.setPaint(Color.white);
g2.fill(highlight);
}
g2.setPaint(Color.black);
textLayout.draw(g2, x, y);
}
public static void main(String[] args) {
JFrame f = new JFrame();
f.getContentPane().add(new Highlights());
f.setSize(850, 250);
f.show();
}
}
|
