qt-everywhere-src-5.15.1/qtquickcontrols/src/dialogs/qml/DefaultWindowDecoration.qml

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import QtQuick 2.2

Rectangle {
    color: "#80000000"
    anchors.fill: parent
    z: 1000000
    property alias content: borderImage.content
    property bool dismissOnOuterClick: true
    signal dismissed
    MouseArea {
        anchors.fill: parent
        onClicked: if (dismissOnOuterClick) dismissed()
        BorderImage {
            id: borderImage
            property Item content

            MouseArea { anchors.fill: parent }

            width: content ? content.width + 15 : 0
            height: content ? content.height + 15 : 0
            onWidthChanged: if (content) content.x = 5
            onHeightChanged: if (content) content.y = 5
            border { left: 10; top: 10; right: 10; bottom: 10 }
            clip: true
            source: "../images/window_border.png"
            anchors.centerIn: parent
            onContentChanged: if (content) content.parent = borderImage
        }
    }
}