package org.eclipse.swt.snippets;

import org.eclipse.swt.SWT;
import org.eclipse.swt.graphics.Color;
import org.eclipse.swt.graphics.Rectangle;
import org.eclipse.swt.internal.gtk.OS;
import org.eclipse.swt.layout.FillLayout;
import org.eclipse.swt.widgets.Canvas;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Shell;

public class ScrollbarsTest {
	public static void main(String[] args) {
		Display display = new Display();
		final Shell shell = new Shell(display, SWT.SHELL_TRIM | SWT.NO_SCROLL);
		shell.setText("Scrollbars Test");
		shell.setLayout(new FillLayout());
		final Canvas canvas = new Canvas(shell, SWT.V_SCROLL | SWT.H_SCROLL);
		final Color red = display.getSystemColor(SWT.COLOR_RED);
		Runnable printer = () -> {
			Rectangle clientArea = canvas.getClientArea();
			Rectangle bounds = canvas.getBounds();
			System.out.println("Client Area: " + clientArea);
			System.out.println("Bounds: " + bounds);
			System.out.println("Trim: " + canvas.computeTrim(0, 0, 0, 0));
			System.out.println("Scrollbars visible: " + canvas.getHorizontalBar().isVisible());
			System.out.println("Client Area and Bounds are the same: " + clientArea.equals(bounds));
			System.out.println("Scrollbars mode: " + canvas.getScrollbarsMode());
			System.out.println("Overlay disabled: " + OS.GTK_OVERLAY_SCROLLING_DISABLED);
		};
		int[] counter = new int[1];
		canvas.addListener(SWT.Paint, e -> {
			Rectangle r = canvas.getClientArea();
			e.gc.setBackground(red);
			e.gc.fillOval(r.x, r.y, r.width, r.height);
			System.out.println("" + System.currentTimeMillis() + " paint " + (counter[0] ++) + " " + e.gc.getClipping());
		});
		canvas.addListener(SWT.MouseDoubleClick, e -> {
			boolean visible = canvas.getHorizontalBar().isVisible();
			canvas.getHorizontalBar().setVisible(!visible);
			canvas.getVerticalBar().setVisible(!visible);
		});
		canvas.addListener(SWT.MouseDown, e -> {
			printer.run();
		});
		canvas.addListener(SWT.Resize, e -> {
			printer.run();
		});
		shell.setSize(600, 500);
		shell.open();
		while (!shell.isDisposed()) {
			if (!display.readAndDispatch())
				display.sleep();
		}
		display.dispose();
	}
}