/*******************************************************************************
 * Copyright (c) 2000, 2004 IBM Corporation and others.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *     IBM Corporation - initial API and implementation
 * Port to the D programming language:
 *     Frank Benoit <benoit@tionex.de>
 *******************************************************************************/
module org.eclipse.swt.snippets.Snippet134;

/*
 * Shell example snippet: create a non-rectangular window
 *
 * For a list of all SWT example snippets see
 * http://www.eclipse.org/swt/snippets/
 *
 * @since 3.0
 */
import org.eclipse.swt.SWT;
import org.eclipse.swt.graphics.Region;
import org.eclipse.swt.graphics.Point;
import org.eclipse.swt.graphics.Rectangle;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.swt.widgets.Button;
import org.eclipse.swt.widgets.Listener;
import org.eclipse.swt.widgets.Event;

import java.lang.all;

version(JIVE){
    import jive.stacktrace;
}

int[] circle(int r, int offsetX, int offsetY) {
    int[] polygon = new int[8 * r + 4];
    //x^2 + y^2 = r^2
    for (int i = 0; i < 2 * r + 1; i++) {
        int x = i - r;
        int y = cast(int)Math.sqrt( cast(float)(r*r - x*x));
        polygon[2*i] = offsetX + x;
        polygon[2*i+1] = offsetY + y;
        polygon[8*r - 2*i - 2] = offsetX + x;
        polygon[8*r - 2*i - 1] = offsetY - y;
    }
    return polygon;
}

void main() {
    auto display = new Display();
    //Shell must be created with style SWT.NO_TRIM
    auto shell = new Shell(display, SWT.NO_TRIM | SWT.ON_TOP);
    shell.setBackground(display.getSystemColor(SWT.COLOR_RED));
    //define a region that looks like a key hole
    Region region = new Region();
    region.add(circle(67, 67, 67));
    region.subtract(circle(20, 67, 50));
    region.subtract([67, 50, 55, 105, 79, 105]);
    //define the shape of the shell using setRegion
    shell.setRegion(region);
    Rectangle size = region.getBounds();
    shell.setSize(size.width, size.height);
    //add ability to move shell around
    Listener l = new class Listener {
        Point origin;
        public void handleEvent(Event e) {
            switch (e.type) {
                case SWT.MouseDown:
                    origin = new Point(e.x, e.y);
                    break;
                case SWT.MouseUp:
                    origin = null;
                    break;
                case SWT.MouseMove:
                    if (origin !is null) {
                        Point p = display.map(shell, null, e.x, e.y);
                        shell.setLocation(p.x - origin.x, p.y - origin.y);
                    }
                    break;
            }
        }
    };
    shell.addListener(SWT.MouseDown, l);
    shell.addListener(SWT.MouseUp, l);
    shell.addListener(SWT.MouseMove, l);
    //add ability to close shell
    Button b = new Button(shell, SWT.PUSH);
    b.setBackground(shell.getBackground());
    b.setText("close");
    b.pack();
    b.setLocation(10, 68);
    b.addListener(SWT.Selection, new class Listener {
        public void handleEvent(Event e) {
            shell.close();
        }
    });
    shell.open();
    while (!shell.isDisposed()) {
        if (!display.readAndDispatch())
            display.sleep();
    }
    region.dispose();
    display.dispose();
}