Mega Code Archive
Demonstrates a Canvas
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//Send questions, comments, bug reports, etc. to the authors:
//Rob Warner (rwarner@interspatial.com)
//Robert Harris (rbrt_harris@yahoo.com)
import org.eclipse.swt.SWT;
import org.eclipse.swt.events.*;
import org.eclipse.swt.graphics.*;
import org.eclipse.swt.layout.*;
import org.eclipse.swt.widgets.*;
/**
* This class demonstrates a Canvas
*/
public class SimpleCanvas {
/**
* Runs the application
*/
public void run() {
Display display = new Display();
Shell shell = new Shell(display);
shell.setText("Canvas Example");
createContents(shell);
shell.open();
while (!shell.isDisposed()) {
if (!display.readAndDispatch()) {
display.sleep();
}
}
display.dispose();
}
/**
* Creates the main window's contents
*
* @param shell the main window
*/
private void createContents(Shell shell) {
shell.setLayout(new FillLayout());
// Create a canvas
Canvas canvas = new Canvas(shell, SWT.NONE);
// Create a button on the canvas
Button button = new Button(canvas, SWT.PUSH);
button.setBounds(10, 10, 300, 40);
button.setText("You can place widgets on a canvas");
// Create a paint handler for the canvas
canvas.addPaintListener(new PaintListener() {
public void paintControl(PaintEvent e) {
// Do some drawing
Rectangle rect = ((Canvas) e.widget).getBounds();
e.gc.setForeground(e.display.getSystemColor(SWT.COLOR_RED));
e.gc.drawFocus(5, 5, rect.width - 10, rect.height - 10);
e.gc.drawText("You can draw text directly on a canvas", 60, 60);
}
});
}
/**
* The application entry point
*
* @param args the command line arguments
*/
public static void main(String[] args) {
new SimpleCanvas().run();
}
}
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