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**
** Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/legal
**
** This file is part of Qt Creator.
**
** 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
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** use the contact form at http://qt.digia.com/contact-us.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file.  Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
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** rights.  These rights are described in the Digia Qt LGPL Exception
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****************************************************************************/

import QtQuick 2.1

Rectangle {
    id: rangeMover
    anchors.fill: parent
    color: "transparent"
    signal rangeChanged()
    signal rangeDoubleClicked()

    property color handleColor: "#869cd1"
    property color rangeColor:"#444a64b8"
    property color dragColor:"#664a64b8"
    property color borderColor:"#cc4a64b8"
    property color dragMarkerColor: "#4a64b8"
    property color singleLineColor: "#4a64b8"

    function setLeft(left) { leftRange.x = left }
    function getLeft() { return leftRange.x }

    function setRight(right) { rightRange.x = right }
    function getRight() { return rightRange.x }

    function getWidth() { return rightRange.x - leftRange.x }

    Rectangle {
        id: selectedRange

        x: leftRange.x
        width: rightRange.x - leftRange.x
        height: parent.height

        color: width > 1 ? (dragArea.pressed ? dragColor : rangeColor) : singleLineColor

        onXChanged: parent.rangeChanged()
        onWidthChanged: parent.rangeChanged()
    }

    Rectangle {
        id: leftRange

        onXChanged: {
            if (dragArea.drag.active)
                rightRange.x = x + dragArea.origWidth;
        }

        x: 0
        height: parent.height
        width: 1
        color: borderColor

        Rectangle {
            id: leftBorderHandle
            height: parent.height
            anchors.right: parent.left
            width: 7
            color: handleColor
            visible: false
            Image {
                source: "range_handle.png"
                x: 2
                width: 4
                height: 9
                fillMode: Image.Tile
                y: parent.height / 2 - 4
            }
        }

        states: State {
            name: "highlighted"
            PropertyChanges {
                target: leftBorderHandle
                visible: true
            }
        }

        MouseArea {
            anchors.fill: leftBorderHandle

            drag.target: leftRange
            drag.axis: "XAxis"
            drag.minimumX: 0
            drag.maximumX: rangeMover.width
            drag.onActiveChanged: drag.maximumX = rightRange.x

            hoverEnabled: true

            onEntered: {
                parent.state = "highlighted";
            }
            onExited: {
                if (!pressed) parent.state = "";
            }
            onReleased: {
                if (!containsMouse) parent.state = "";
            }
        }
    }

    Rectangle {
        id: rightRange

        x: 1
        height: parent.height
        width: 1
        color: borderColor

        Rectangle {
            id: rightBorderHandle
            height: parent.height
            anchors.left: parent.right
            width: 7
            color: handleColor
            visible: false
            Image {
                source: "range_handle.png"
                x: 2
                width: 4
                height: 9
                fillMode: Image.Tile
                y: parent.height / 2 - 4
            }
        }

        states: State {
            name: "highlighted"
            PropertyChanges {
                target: rightBorderHandle
                visible: true
            }
        }

        MouseArea {
            anchors.fill: rightBorderHandle

            drag.target: rightRange
            drag.axis: "XAxis"
            drag.minimumX: 0
            drag.maximumX: rangeMover.width
            drag.onActiveChanged: drag.minimumX = leftRange.x

            hoverEnabled: true

            onEntered: {
                parent.state = "highlighted";
            }
            onExited: {
                if (!pressed) parent.state = "";
            }
            onReleased: {
                if (!containsMouse) parent.state = "";
            }
        }
    }

    MouseArea {
        id: dragArea
        property int origWidth: 0

        anchors.fill: selectedRange
        drag.target: leftRange
        drag.axis: "XAxis"
        drag.minimumX: 0
        drag.maximumX: rangeMover.width - origWidth
        drag.onActiveChanged: origWidth = selectedRange.width
        onDoubleClicked: parent.rangeDoubleClicked()
    }
}