package org.eclipse.swt.snippets;

/*
 * Take a snapshot of a control
 *
 * For a list of all SWT example snippets see
 * http://www.eclipse.org/swt/snippets/
 *
 * @since 3.4
 */
import org.eclipse.swt.*;
import org.eclipse.swt.graphics.*;
import org.eclipse.swt.layout.*;
import org.eclipse.swt.widgets.*;

public class Snippet292 {
	public static void main(String[] args) {
		final Display display = new Display();
		final Shell shell = new Shell(display);
		shell.setText("Snippet 292");
		final Group group = new Group(shell, SWT.NONE);
		group.setText("Group");
		group.setLayout(new GridLayout());
		final Tree tree = new Tree(group, SWT.BORDER);
		for (int i = 0; i < 5; i++) {
			TreeItem treeItem = new TreeItem(tree, SWT.NONE);
			treeItem.setText("TreeItem " + i);
			for (int j = 0; j < 3; j++) {
				TreeItem subItem = new TreeItem(treeItem, SWT.NONE);
				subItem.setText("SubItem " + i + "-" + j);
			}
			if (i % 3 == 0)
				treeItem.setExpanded(true);
		}
		new Button(group, SWT.PUSH).setText("Button");
		final Label label = new Label(shell, SWT.NONE);
		label.addListener(SWT.Dispose, e -> {
			Image image = label.getImage();
			if (image != null)
				image.dispose();
		});
		Button button = new Button(shell, SWT.PUSH);
		button.setText("Snapshot");
		button.addListener(SWT.Selection, e -> {
			Image image = label.getImage();
			if (image != null)
				image.dispose();
			Rectangle rect = group.getBounds();
			ImageGcDrawer imageGcDrawer = (gc, imageWidth, imageHeight) -> {
				boolean success = group.print(gc);
				if (!success) {
					MessageBox messageBox = new MessageBox(shell, SWT.OK | SWT.PRIMARY_MODAL);
					messageBox.setMessage("Sorry, taking a snapshot is not supported on your platform");
					messageBox.open();
				}
			};
			image = new Image(display, imageGcDrawer, rect.width, rect.height);
			label.setImage(image);
		});
		GridLayout layout = new GridLayout(2, true);
		shell.setLayout(layout);
		group.setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, true));
		label.setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, true));
		button.setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, true, 2, 1));
		shell.pack();
		shell.open();
		while (!shell.isDisposed()) {
			if (!display.readAndDispatch())
				display.sleep();
		}
		display.dispose();
	}
}