/****************************************************************************
**
** Copyright (C) 2015 The Qt Company Ltd.
** Contact: http://www.qt.io/licensing/
**
** This file is part of the Qt Graphical Effects module.
**
** $QT_BEGIN_LICENSE:BSD$
** 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

Item {
    id: slider

    property real value: 1
    property real maximum: 1
    property real minimum: 0
    property string caption: ""
    property bool pressed: mouseArea.pressed
    property bool integer: false
    property string handleSource: "images/slider_handle.png"

    width: parent.width
    height: 20

    function updatePos() {
        if (maximum > minimum) {
            var pos = (track.width - 10) * (value - minimum) / (maximum - minimum) + 5;
            return Math.min(Math.max(pos, 5), track.width - 5) - 10;
        } else {
            return 5;
        }
    }

    Text {
        id: captionText
        width: 110
        anchors.verticalCenter: parent.verticalCenter
        horizontalAlignment: Text.AlignRight
        text: slider.caption + ':'
        font.family: "Arial"
        font.pixelSize: 11
        color: "#B3B3B3"
    }

    Text {
        id: valueCaption
        anchors.left: captionText.right
        anchors.leftMargin: 11
        anchors.verticalCenter: parent.verticalCenter
        width: 35
        horizontalAlignment: Text.AlignLeft
        text: integer ? slider.value.toFixed(0) : slider.value.toFixed(1)
        font.family: "Arial"
        font.pixelSize: 11
        color: "#999999"
    }

    Item {
        id: track
        height: parent.height
        anchors.verticalCenter: parent.verticalCenter
        anchors.left: parent.left
        anchors.leftMargin: parent.width / 2
        anchors.right: parent.right
        anchors.rightMargin: 10

        BorderImage {
            source: "images/slider_track.png"
            anchors.left: parent.left
            anchors.right: parent.right
            border.right: 2
        }

        BorderImage {
            id: trackFilled
            anchors.left: minimum == -maximum ? (value < 0 ? handle.horizontalCenter : parent.horizontalCenter) : parent.left
            anchors.right: minimum == -maximum && value < 0 ? parent.horizontalCenter : handle.horizontalCenter
            source: "images/slider_track_filled.png"
            border.left: 3
            border.right: 3
        }

        Image {
            id: handle;
            smooth: true
            source: mouseArea.pressed ? 'images/slider_handle_pressed.png' : slider.handleSource
            x: updatePos()
        }

        MouseArea {
            id: mouseArea
            anchors { left: parent.left; right: parent.right; verticalCenter: parent.verticalCenter }
            height: 16
            preventStealing: true

            onPressed: {
                var handleX = Math.max(0, Math.min(mouseX, mouseArea.width))
                var realValue = (maximum - minimum) * handleX / mouseArea.width + minimum;
                value = slider.integer ? Math.round(realValue) : realValue;
            }

            onPositionChanged: {
                if (pressed) {
                    var handleX = Math.max(0, Math.min(mouseX, mouseArea.width))
                    var realValue = (maximum - minimum) * handleX / mouseArea.width + minimum;
                    value = slider.integer ? Math.round(realValue) : realValue;
                }
            }
        }
    }
}
