/****************************************************************************
**
** Copyright (C) 2017 The Qt Company Ltd.
** Copyright (C) 2017 Pier Luigi Fiorini <pierluigi.fiorini@gmail.com>
** Contact: http://www.qt-project.org/legal
**
** This file is part of the examples of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:BSD$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** BSD License Usage
** Alternatively, you may use this file under the terms of the BSD license
** as follows:
**
** "Redistribution and use in source and binary forms, with or without
** modification, are permitted provided that the following conditions are
** met:
**   * Redistributions of source code must retain the above copyright
**     notice, this list of conditions and the following disclaimer.
**   * Redistributions in binary form must reproduce the above copyright
**     notice, this list of conditions and the following disclaimer in
**     the documentation and/or other materials provided with the
**     distribution.
**   * Neither the name of The Qt Company Ltd nor the names of its
**     contributors may be used to endorse or promote products derived
**     from this software without specific prior written permission.
**
**
** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
**
** $QT_END_LICENSE$
**
****************************************************************************/

import QtQml
import QtQuick
import QtQuick.Window as Window
import QtWayland.Compositor
import QtWayland.Compositor.XdgShell
import QtWayland.Compositor.WlShell
import QtQml.Models

WaylandCompositor {
    id: comp

    ListModel {
        id: emulatedScreens
        ListElement { name: "left";   virtualX: 0;    virtualY: 0; width: 800; height: 600 }
        ListElement { name: "middle"; virtualX: 800;  virtualY: 0; width: 800; height: 600 }
        ListElement { name: "right";  virtualX: 1600; virtualY: 0; width: 800; height: 600 }
    }

    property bool emulated: Qt.application.screens.length < 2

    Instantiator {
        id: screens
        model: emulated ? emulatedScreens : Qt.application.screens

        delegate: CompositorScreen {
            surfaceArea.color: "lightsteelblue"
            text: name
            compositor: comp
            screen: modelData
            Component.onCompleted: if (!comp.defaultOutput) comp.defaultOutput = this
            position: Qt.point(virtualX, virtualY)
            windowed: emulated
        }
    }

    Component {
        id: chromeComponent
        Chrome {}
    }

    Component {
        id: moveItemComponent
        Item {}
    }

    Item {
        id: rootItem
    }

    WlShell {
        onWlShellSurfaceCreated: handleShellSurfaceCreated(shellSurface)
    }

    XdgShell {
        onToplevelCreated: handleShellSurfaceCreated(xdgSurface)
    }

    function createShellSurfaceItem(shellSurface, moveItem, output) {
        var parentSurfaceItem = output.viewsBySurface[shellSurface.parentSurface];
        var parent = parentSurfaceItem || output.surfaceArea;
        var item = chromeComponent.createObject(parent, {
            "shellSurface": shellSurface,
            "moveItem": moveItem,
            "output": output
        });
        if (parentSurfaceItem) {
            item.x += output.position.x;
            item.y += output.position.y;
        }
        output.viewsBySurface[shellSurface.surface] = item;
    }

    function handleShellSurfaceCreated(shellSurface) {
        var moveItem = moveItemComponent.createObject(rootItem, {
            "x": screens.objectAt(0).position.x,
            "y": screens.objectAt(0).position.y,
            "width": Qt.binding(function() { return shellSurface.surface.width; }),
            "height": Qt.binding(function() { return shellSurface.surface.height; })
        });
        for (var i = 0; i < screens.count; ++i)
            createShellSurfaceItem(shellSurface, moveItem, screens.objectAt(i));
    }
}
