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import QtQuick 2.1
import QtQuick.Controls 1.0
import QtQuick.Controls.Private 1.0

/*!
    \qmltype ToolBar
    \inqmlmodule QtQuick.Controls 1.0
    \since QtQuick.Controls 1.0
    \ingroup applicationwindow
    \brief Contains ToolButton and related controls.

    The common way of using ToolBar is in relation to \l ApplicationWindow. It
    provides styling and is generally designed to work well with ToolButton as
    well as other controls.

    Note that the ToolBar does not provide a layout of its own, but requires
    you to position its contents, for instance by creating a \l RowLayout.

    If only a single item is used within the ToolBar, it will resize to fit the implicitHeight
    of its contained item. This makes it particularly suitable for use together with layouts.
    Otherwise the height is platform dependent.

    \code
    import QtQuick.Controls 1.0
    import QtQuick.Layouts 1.0

    ApplicationWindow {
        toolBar: ToolBar {
            RowLayout {
                ToolButton { ... }
                ToolButton { ... }
                ToolButton { ... }
            }
        }
    }
    \endcode
*/

Item {
    id: toolbar

    activeFocusOnTab: false
    Accessible.role: Accessible.ToolBar

    width: parent ? parent.width : implicitWidth
    implicitWidth: container.leftMargin + container.rightMargin + container.calcWidth()
    implicitHeight: container.topMargin + container.bottomMargin + container.calcHeight()

    /*! \internal */
    property Component style: Qt.createComponent(Settings.style + "/ToolBarStyle.qml", toolbar)

    /*! \internal */
    property alias __style: styleLoader.item

    /*! \internal */
    default property alias __content: container.data

    /*!
        \qmlproperty Item ToolBar::contentItem

        This property holds the content Item of the tool bar.

        Items declared as children of a ToolBar are automatically parented to the ToolBar's contentItem.
        Items created dynamically need to be explicitly parented to the contentItem:

        \note The implicit size of the ToolBar is calculated based on the size of its content. If you want to anchor
        items inside the tool bar, you must specify an explicit width and height on the ToolBar itself.
    */
    readonly property alias contentItem: container

    data: [
        Loader {
            id: loader
            anchors.fill: parent
            sourceComponent: styleLoader.item ? styleLoader.item.panel : null
            onLoaded: item.z = -1
            Loader {
                id: styleLoader
                property alias __control: toolbar
                sourceComponent: style
            }
        },
        Item {
            id: container
            z: 1
            focus: true
            anchors.fill: parent

            anchors.topMargin: topMargin
            anchors.leftMargin: leftMargin
            anchors.rightMargin: rightMargin
            anchors.bottomMargin: bottomMargin

            property int topMargin: __style ? __style.padding.top : 0
            property int bottomMargin: __style ? __style.padding.bottom : 0
            property int leftMargin: __style ? __style.padding.left : 0
            property int rightMargin: __style ? __style.padding.right : 0

            property Item layoutItem: container.children.length === 1 ? container.children[0] : null
            function calcWidth() { return (layoutItem ? (layoutItem.implicitWidth || layoutItem.width) +
                                                          (layoutItem.anchors.fill ? layoutItem.anchors.leftMargin +
                                                                                     layoutItem.anchors.rightMargin : 0) :
                                                          loader.item ? loader.item.implicitWidth : 0) }
            function calcHeight () { return (layoutItem ? (layoutItem.implicitHeight || layoutItem.height) +
                                                          (layoutItem.anchors.fill ? layoutItem.anchors.topMargin +
                                                                                     layoutItem.anchors.bottomMargin : 0) :
                                                          loader.item ? loader.item.implicitHeight : 0) }
        }]
}
