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import QtQuick 2.2
import QtQuick.Controls 1.2
import QtQuick.Controls.Private 1.0

/*!
    \qmltype TabViewStyle
    \inqmlmodule QtQuick.Controls.Styles
    \since 5.1
    \ingroup viewsstyling
    \brief Provides custom styling for TabView

\qml
    TabView {
        id: frame
        anchors.fill: parent
        anchors.margins: 4
        Tab { title: "Tab 1" }
        Tab { title: "Tab 2" }
        Tab { title: "Tab 3" }

        style: TabViewStyle {
            frameOverlap: 1
            tab: Rectangle {
                color: styleData.selected ? "steelblue" :"lightsteelblue"
                border.color:  "steelblue"
                implicitWidth: Math.max(text.width + 4, 80)
                implicitHeight: 20
                radius: 2
                Text {
                    id: text
                    anchors.centerIn: parent
                    text: styleData.title
                    color: styleData.selected ? "white" : "black"
                }
            }
            frame: Rectangle { color: "steelblue" }
        }
    }
\endqml

*/

Style {

    /*! The \l ScrollView attached to this style. */
    readonly property TabView control: __control

    /*! This property holds whether the user can move the tabs.
        Tabs are not movable by default. */
    property bool tabsMovable: false

    /*! This property holds the horizontal alignment of
        the tab buttons. Supported values are:
        \list
        \li Qt.AlignLeft (default)
        \li Qt.AlignHCenter
        \li Qt.AlignRight
        \endlist
    */
    property int tabsAlignment: Qt.AlignLeft

    /*! This property holds the amount of overlap there are between
      individual tab buttons. */
    property int tabOverlap: 1

    /*! This property holds the amount of overlap there are between
      individual tab buttons and the frame. */
    property int frameOverlap: 2

    /*! This defines the tab frame. */
    property Component frame: Rectangle {
        color: "#dcdcdc"
        border.color: "#aaa"

        Rectangle {
            anchors.fill: parent
            color: "transparent"
            border.color: "#66ffffff"
            anchors.margins: 1
        }
    }

    /*! This defines the tab. You can access the tab state through the
        \c styleData property, with the following properties:

        \table
            \row \li readonly property int \b styleData.index \li This is the current tab index.
            \row \li readonly property bool \b styleData.selected \li This is the active tab.
            \row \li readonly property string \b styleData.title \li Tab title text.
            \row \li readonly property bool \b styleData.nextSelected \li The next tab is selected.
            \row \li readonly property bool \b styleData.previousSelected \li The previous tab is selected.
            \row \li readonly property bool \b styleData.hovered \li The tab is being hovered.
            \row \li readonly property bool \b styleData.enabled \li The tab is enabled. (since QtQuick.Controls.Styles 1.2)
            \row \li readonly property bool \b styleData.activeFocus \li The tab button has keyboard focus.
            \row \li readonly property bool \b styleData.availableWidth \li The available width for the tabs.
            \row \li readonly property bool \b styleData.totalWidth \li The total width of the tabs. (since QtQuick.Controls.Styles 1.2)
        \endtable
    */
    property Component tab: Item {
        scale: control.tabPosition === Qt.TopEdge ? 1 : -1

        property int totalOverlap: tabOverlap * (control.count - 1)
        property real maxTabWidth: control.count > 0 ? (styleData.availableWidth + totalOverlap) / control.count : 0

        implicitWidth: Math.round(Math.min(maxTabWidth, textitem.implicitWidth + 20))
        implicitHeight: Math.round(textitem.implicitHeight + 10)

        Item {
            anchors.fill: parent
            anchors.bottomMargin: styleData.selected ? 0 : 2
            BorderImage {
                anchors.fill: parent
                source: styleData.selected ? "images/tab_selected.png" : "images/tab.png"
                border.top: 6
                border.bottom: 6
                border.left: 6
                border.right: 6
                anchors.topMargin: styleData.selected ? 0 : 1
            }
        }
        Text {
            id: textitem
            anchors.fill: parent
            anchors.leftMargin: 4
            anchors.rightMargin: 4
            verticalAlignment: Text.AlignVCenter
            horizontalAlignment: Text.AlignHCenter
            text: styleData.title
            elide: Text.ElideMiddle
            renderType: Text.NativeRendering
            scale: control.tabPosition === Qt.TopEdge ? 1 : -1
            property var __syspal: SystemPalette {
                colorGroup: styleData.enabled ?
                                SystemPalette.Active : SystemPalette.Disabled
            }
            color: __syspal.text
            Rectangle {
                anchors.centerIn: parent
                width: textitem.paintedWidth + 6
                height: textitem.paintedHeight + 4
                visible: (styleData.activeFocus && styleData.selected)
                radius: 3
                color: "#224f9fef"
                border.color: "#47b"
            }
        }
    }

    /*! This defines the left corner. */
    property Component leftCorner: null

    /*! This defines the right corner. */
    property Component rightCorner: null

    /*! This defines the tab bar background. */
    property Component tabBar: null
}
