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/****************************************************************************
**
** Copyright (C) 2016 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the examples of Qt for Device Creation.
**
** $QT_BEGIN_LICENSE:BSD$
** 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 QtQuick 2.0
import "settings.js" as Settings

Item {
    id: slider
    height: handle.height
    // value is read/write.
    property real value: 0
    property real maximum: 1
    property real minimum: 0
    property int xMax: width - handle.width
    onXMaxChanged: updatePos()
    onMinimumChanged: updatePos()
    onValueChanged: if (!pressed) updatePos()
    property bool mutable: true
    property alias pressed : backgroundMouse.pressed

    signal valueChangedByHandle(int newValue)

    function updatePos() {
        if (maximum > minimum) {
            var pos = 0 + (value - minimum) * slider.xMax / (maximum - minimum);
            pos = Math.min(pos, width - handle.width - 0);
            pos = Math.max(pos, 0);
            handle.x = pos;
        } else {
            handle.x = 0;
        }
    }

    Rectangle {
        id: background
        width: slider.width
        anchors.verticalCenter: slider.verticalCenter
        height: 5
        color: "red" //Settings.backgroundColor
        radius: 2

        MouseArea {
            id: backgroundMouse
            anchors.fill: parent
            anchors.topMargin: -24
            anchors.bottomMargin: -24
            enabled: slider.mutable
            drag.target: handle
            drag.axis: Drag.XAxis
            drag.minimumX: 0
            drag.maximumX: slider.xMax
            onPressedChanged: {
                value = Math.max(minimum, Math.min(maximum, (maximum - minimum) * (mouseX - handle.width/2) / slider.xMax + minimum));
                valueChangedByHandle(value);
                updatePos();
            }
            onPositionChanged: {
                value = Math.max(minimum, Math.min(maximum, (maximum - minimum) * (mouseX - handle.width/2) / slider.xMax + minimum));
                valueChangedByHandle(value);
            }
            onWheel: {
                value = Math.max(minimum, Math.min(maximum, value + (wheel.angleDelta.y > 0 ? 1 : -1) * (10 / slider.xMax) * (slider.maximum - slider.minimum)));
                valueChangedByHandle(value);
                updatePos();
            }
        }
    }

    Rectangle {
        id: progress
        height: 5
        anchors.verticalCenter: background.verticalCenter
        anchors.left: background.left
        anchors.right: handle.right
        anchors.rightMargin: handle.width / 2
        visible: slider.enabled
        color: "green"
        radius: 2
    }

    Rectangle {
        id: handle
        width: 40
        height: width
        radius: width / 2
        color: "#41cd52"
        antialiasing: true
        anchors.centerIn: handle
        visible: true
    }
}