nova-shell/modules/Backlight.qml

import QtQuick
import Quickshell
import Quickshell.Io
import "." as M

M.BarSection {
    id: root
    spacing: M.Theme.moduleSpacing
    opacity: M.Modules.backlight.enable && percent > 0 ? 1 : 0
    visible: opacity > 0
    tooltip: ""

    property int percent: 0
    property bool _osdActive: false
    property bool _percentInit: false
    readonly property bool _showPanel: root._hovered || hoverPanel.panelHovered || _osdActive

    onPercentChanged: {
        if (!_percentInit) {
            _percentInit = true;
            return;
        }
        if (percent > 0)
            _flashPanel();
    }

    function _flashPanel() {
        _osdActive = true;
        _osdTimer.restart();
    }

    Timer {
        id: _osdTimer
        interval: 1500
        onTriggered: root._osdActive = false
    }

    Process {
        id: adjProc
        property string cmd: ""
        command: ["sh", "-c", cmd]
        onRunningChanged: if (!running && cmd !== "")
            current.reload()
    }

    function adjust(delta) {
        const step = M.Modules.backlight.step || 5;
        adjProc.cmd = delta > 0 ? "light -A " + step : "light -U " + step;
        adjProc.running = true;
    }

    function setPercent(pct) {
        adjProc.cmd = "light -S " + Math.round(Math.max(0, Math.min(100, pct)));
        adjProc.running = true;
    }

    property string _blDev: ""
    Process {
        id: detectBl
        running: true
        command: ["sh", "-c", "ls /sys/class/backlight/ 2>/dev/null | head -1"]
        stdout: StdioCollector {
            onStreamFinished: {
                const dev = text.trim();
                if (dev)
                    root._blDev = "/sys/class/backlight/" + dev;
            }
        }
    }

    FileView {
        id: current
        path: root._blDev ? root._blDev + "/brightness" : ""
        watchChanges: true
        onFileChanged: reload()
        onLoaded: root._update()
    }
    FileView {
        id: max
        path: root._blDev ? root._blDev + "/max_brightness" : ""
        onLoaded: root._update()
    }

    function _update() {
        const c = parseInt(current.text());
        const m = parseInt(max.text());
        if (m > 0)
            root.percent = Math.round((c / m) * 100);
    }

    M.BarIcon {
        icon: "\uF185"
        anchors.verticalCenter: parent.verticalCenter
    }
    M.BarLabel {
        label: root.percent + "%"
        minText: "100%"
        anchors.verticalCenter: parent.verticalCenter
    }

    WheelHandler {
        onWheel: event => root.adjust(event.angleDelta.y)
    }

    M.HoverPanel {
        id: hoverPanel
        showPanel: root._showPanel
        screen: QsWindow.window?.screen ?? null
        anchorItem: root
        accentColor: root.accentColor
        panelNamespace: "nova-backlight"
        panelTitle: "Brightness"
        contentWidth: 200

        Item {
            width: parent.width
            height: 36

            Text {
                id: blIcon
                anchors.left: parent.left
                anchors.leftMargin: 12
                anchors.verticalCenter: parent.verticalCenter
                text: "\uF185"
                color: root.accentColor
                font.pixelSize: M.Theme.fontSize + 2
                font.family: M.Theme.iconFontFamily
            }

            Item {
                id: slider
                anchors.left: blIcon.right
                anchors.leftMargin: 8
                anchors.right: blLabel.left
                anchors.rightMargin: 8
                anchors.verticalCenter: parent.verticalCenter
                height: 6

                Rectangle {
                    anchors.fill: parent
                    color: M.Theme.base02
                    radius: 3
                }

                Rectangle {
                    width: parent.width * root.percent / 100
                    height: parent.height
                    color: root.accentColor
                    radius: 3

                    Behavior on width {
                        NumberAnimation {
                            duration: 80
                        }
                    }
                }

                MouseArea {
                    anchors.fill: parent
                    anchors.margins: -6
                    cursorShape: Qt.PointingHandCursor
                    onPressed: mouse => _set(mouse)
                    onPositionChanged: mouse => {
                        if (pressed)
                            _set(mouse);
                    }
                    function _set(mouse) {
                        root.setPercent(mouse.x / slider.width * 100);
                    }
                }
            }

            Text {
                id: blLabel
                anchors.right: parent.right
                anchors.rightMargin: 12
                anchors.verticalCenter: parent.verticalCenter
                text: root.percent + "%"
                color: M.Theme.base05
                font.pixelSize: M.Theme.fontSize
                font.family: M.Theme.fontFamily
                width: 30
            }
        }
    }
}