StemRoller: desktop stem separator, Android stems player, and server daemons
- stemroller/: PySide6/QML desktop app and player for separating music into stems - android/: Plex music player that plays per-stem mixes, with Android Auto support, a graphic + parametric (Equalizer APO-style) EQ, and offline downloads - server/: stemserve (serves stems to the app) and stemd (separates the library on the server's GPU, with "Stem Now" priority requests) Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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import QtQuick
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import QtQuick.Controls.Basic
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import QtQuick.Dialogs
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import StemRoller
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Window {
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id: win
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width: 1440
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height: 900
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minimumWidth: 960
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minimumHeight: 600
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visible: true
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title: "StemRoller"
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color: "transparent"
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flags: Qt.Window | Qt.FramelessWindowHint
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readonly property bool maximized: visibility === Window.Maximized || visibility === Window.FullScreen
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readonly property int radius: maximized ? 0 : 10
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function toggleMaximized() { maximized ? showNormal() : showMaximized() }
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// Glass snapshot size: refreshed only after a resize settles.
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property int fxW: width
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property int fxH: height
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Timer { id: fxTimer; interval: 150; onTriggered: { win.fxW = win.width; win.fxH = win.height } }
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onWidthChanged: fxTimer.restart()
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onHeightChanged: fxTimer.restart()
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// Per-frame playback state, read from the audio ring buffer.
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property real playPos: 0
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property real levelL: 0
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property real levelR: 0
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FrameAnimation {
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running: audio.playing || win.levelL > 0.0005 || win.levelR > 0.0005
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onTriggered: {
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var s = audio.snapshot()
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if (s[3]) win.playPos = s[0]
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var k = Math.exp(-frameTime * 10)
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win.levelL = Math.max(s[1], win.levelL * k)
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win.levelR = Math.max(s[2], win.levelR * k)
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if (win.levelL < 0.0005) win.levelL = 0
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if (win.levelR < 0.0005) win.levelR = 0
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}
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}
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Connections {
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target: audio
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function onLoadedChanged() { win.playPos = 0 }
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}
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Connections {
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target: app
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function onToast(msg, kind, folder) { toast.show(msg, kind, folder) }
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}
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Component.onCompleted: Theme.fontFamily = uiFont
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FileDialog {
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id: fileDialog
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title: "Add audio files"
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fileMode: FileDialog.OpenFiles
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nameFilters: ["Audio (*.mp3 *.wav *.flac *.ogg *.oga *.opus *.m4a *.aac *.aif *.aiff *.wma *.mp4 *.mkv *.webm *.mka *.wv *.ape)", "All files (*)"]
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onAccepted: app.addUrls(selectedFiles)
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}
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Shortcut { sequences: ["Space"]; enabled: audio.loaded && !settings.opened; onActivated: audio.toggle() }
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Shortcut { sequences: ["Home"]; enabled: audio.loaded; onActivated: { audio.seek(0); win.playPos = 0 } }
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Shortcut { sequences: [StandardKey.Open]; onActivated: fileDialog.open() }
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Shortcut { sequences: ["Ctrl+,"]; onActivated: settings.open() }
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Shortcut { sequences: ["F12"]; onActivated: appSettings.frameOverlay = !appSettings.frameOverlay }
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Shortcut { sequences: ["F11"]; onActivated: win.toggleMaximized() }
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Shortcut { sequences: [StandardKey.Quit]; onActivated: win.close() }
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Item {
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id: frame
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anchors.fill: parent
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// window background: placeholder until the aurora texture arrives
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Rectangle {
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anchors.fill: parent
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radius: win.radius
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color: Theme.bg
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}
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Image {
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id: backdrop
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anchors.fill: parent
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source: "image://fx/backdrop/" + win.fxW + "x" + win.fxH + "/" + win.radius
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asynchronous: true
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retainWhileLoading: true
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cache: true
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opacity: status === Image.Ready ? 1 : 0
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Behavior on opacity { NumberAnimation { duration: Theme.slow } }
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}
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TitleBar {
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id: titleBar
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anchors { left: parent.left; right: parent.right; top: parent.top }
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offsetX: 0
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offsetY: 0
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onOpenSettings: settings.open()
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}
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Sidebar {
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id: sidebar
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anchors { left: parent.left; top: titleBar.bottom; bottom: transport.top }
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width: 220
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offsetX: 0
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offsetY: titleBar.height
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onBrowse: fileDialog.open()
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Rectangle { anchors { right: parent.right; top: parent.top; bottom: parent.bottom } width: 1; color: Theme.hairline }
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}
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Item {
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id: mainPane
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anchors { left: sidebar.right; right: parent.right; top: titleBar.bottom; bottom: transport.top }
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clip: true
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Image { // dither the dark gradients behind content
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anchors.fill: parent
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source: "image://fx/noise"
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fillMode: Image.Tile
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cache: true
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}
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DropZone {
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anchors.fill: parent
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visible: !app.selected.valid
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dragging: drop.containsDrag
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onBrowse: fileDialog.open()
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}
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TrackView {
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anchors.fill: parent
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visible: app.selected.valid
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}
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// drag-over affordance when a track is already showing
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Item {
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anchors.fill: parent
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visible: opacity > 0
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opacity: drop.containsDrag && app.selected.valid ? 1 : 0
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Behavior on opacity { NumberAnimation { duration: Theme.med } }
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Rectangle { anchors.fill: parent; color: Theme.alpha(Theme.bg, 0.82) }
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DashedFrame { anchors.fill: parent; anchors.margins: 24; radius: 16 }
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Glow { anchors.margins: 24 - m; radius: 16; sigma: 8; opacity: 0.4 }
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Txt {
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anchors.centerIn: parent
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text: "Drop to add to the queue"
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font.pixelSize: Theme.fs28
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font.weight: Font.DemiBold
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}
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}
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FrameOverlay {
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visible: appSettings.frameOverlay || devOverlay
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anchors { right: parent.right; bottom: parent.bottom; margins: 12 }
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z: 100
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}
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}
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Transport {
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id: transport
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anchors { left: parent.left; right: parent.right; bottom: parent.bottom }
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height: 64
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offsetX: 0
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offsetY: win.height - 64
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}
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Item {
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anchors { horizontalCenter: mainPane.horizontalCenter; bottom: transport.top; bottomMargin: 16 }
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width: toast.width
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height: 48
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Toast { id: toast; maxWidth: mainPane.width - 48 }
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}
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// window edge highlight
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Rectangle {
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anchors.fill: parent
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radius: win.radius
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color: "transparent"
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border.width: win.maximized ? 0 : 1
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border.color: Qt.rgba(1, 1, 1, 0.12)
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}
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DropArea {
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id: drop
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anchors.fill: parent
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keys: ["text/uri-list"]
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onDropped: (e) => {
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if (e.hasUrls) {
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app.addUrls(e.urls)
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e.acceptProposedAction()
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}
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}
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}
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// resize grips (compositor-driven)
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Item {
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anchors.fill: parent
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visible: !win.maximized
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readonly property int g: 6
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ResizeEdge { edges: Qt.LeftEdge; x: 0; y: 12; width: parent.g; height: parent.height - 24 }
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ResizeEdge { edges: Qt.RightEdge; x: parent.width - parent.g; y: 12; width: parent.g; height: parent.height - 24 }
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ResizeEdge { edges: Qt.TopEdge; x: 12; y: 0; width: parent.width - 24; height: parent.g - 2 }
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ResizeEdge { edges: Qt.BottomEdge; x: 12; y: parent.height - parent.g; width: parent.width - 24; height: parent.g }
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ResizeEdge { edges: Qt.LeftEdge | Qt.TopEdge; x: 0; y: 0; width: 12; height: 12 }
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ResizeEdge { edges: Qt.RightEdge | Qt.TopEdge; x: parent.width - 12; y: 0; width: 12; height: 12 }
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ResizeEdge { edges: Qt.LeftEdge | Qt.BottomEdge; x: 0; y: parent.height - 12; width: 12; height: 12 }
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ResizeEdge { edges: Qt.RightEdge | Qt.BottomEdge; x: parent.width - 12; y: parent.height - 12; width: 12; height: 12 }
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}
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}
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SettingsDialog { id: settings; parent: Overlay.overlay; win: win }
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}
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