qt-everywhere-src-5.15.1/qtquickcontrols/src/extras/Styles/Flat/ApplicationWindowStyle.qml

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import QtQuick 2.14
import QtQuick.Controls 1.2
import QtQuick.Controls.Styles 1.4 as Base
import QtQuick.Controls.Styles.Flat 1.0

Base.ApplicationWindowStyle {
    panel: Item {
        readonly property alias contentArea: contentArea
        readonly property alias menuBarArea: menuBarArea
        readonly property alias toolBarArea: toolBarArea
        readonly property alias statusBarArea: statusBarArea
        readonly property bool hasToolBar: !!control.toolBar && control.toolBar.Accessible.role === Accessible.ToolBar

        Rectangle {
            id: background
            visible: !styleData.hasColor
            color: FlatStyle.backgroundColor
        }

        Item {
            id: contentArea
            anchors.top: parent.top
            anchors.left: parent.left
            anchors.right: parent.right
            anchors.bottom: statusBarArea.top
            anchors.topMargin: toolBarArea.implicitHeight
        }

        Item {
            id: toolBarArea
            anchors.top: parent.top
            anchors.left: parent.left
            anchors.right: parent.right
            implicitHeight: childrenRect.height
            height: visibleChildren.length > 0 ? implicitHeight : 0

            Loader {
                visible: active
                active: !hasToolBar && !!control.menuBar
                anchors.left: parent.left
                anchors.right: parent.right
                sourceComponent: ToolBar {
                    __menu: proxyMenu.items.length > 1 ? proxyMenu :
                            proxyMenu.items.length === 1 ? proxyMenu.items[0] : null
                }
            }
        }

        Item {
            id: statusBarArea
            anchors.bottom: parent.bottom
            anchors.left: parent.left
            anchors.right: parent.right
            implicitHeight: childrenRect.height
            height: visibleChildren.length > 0 ? implicitHeight : 0
        }

        Item {
            id: menuBarArea
            visible: false

            Menu {
                id: proxyMenu
                __isProxy: true
                items: control.menuBar ? control.menuBar.menus : []
            }

            Qml.Binding {
                target: control.toolBar
                property: "__menu"
                value: proxyMenu.items.length > 1 ? proxyMenu :
                       proxyMenu.items.length === 1 ? proxyMenu.items[0] : null
                when: hasToolBar
                restoreMode: Binding.RestoreBinding
            }
        }
    }
}