DankMaterialShell/quickshell/Modules/Settings/DisplayConfig/MonitorCanvas.qml

import QtQuick
import qs.Common

Rectangle {
    id: root

    property var filteredOutputs: {
        const all = DisplayConfigState.allOutputs || {};
        const keys = Object.keys(all);
        if (SettingsData.displayShowDisconnected)
            return keys;
        return keys.filter(k => all[k]?.connected);
    }

    property var filteredBounds: {
        const all = DisplayConfigState.allOutputs || {};
        let minX = Infinity, minY = Infinity, maxX = -Infinity, maxY = -Infinity;
        for (const name of filteredOutputs) {
            const output = all[name];
            if (!output?.logical)
                continue;
            const x = output.logical.x;
            const y = output.logical.y;
            const w = output.logical.width || 1920;
            const h = output.logical.height || 1080;
            minX = Math.min(minX, x);
            minY = Math.min(minY, y);
            maxX = Math.max(maxX, x + w);
            maxY = Math.max(maxY, y + h);
        }
        if (minX === Infinity)
            return {
                minX: 0,
                minY: 0,
                width: 1920,
                height: 1080
            };
        return {
            minX: minX,
            minY: minY,
            width: maxX - minX,
            height: maxY - minY
        };
    }

    width: parent.width
    height: 280
    radius: Theme.cornerRadius
    color: Theme.surfaceContainerHighest
    border.color: Theme.outline
    border.width: 1

    Item {
        id: canvas
        anchors.fill: parent
        anchors.margins: Theme.spacingL

        property var bounds: root.filteredBounds
        property real scaleFactor: {
            if (bounds.width === 0 || bounds.height === 0)
                return 0.1;
            const padding = Theme.spacingL * 2;
            const scaleX = (width - padding) / bounds.width;
            const scaleY = (height - padding) / bounds.height;
            return Math.min(scaleX, scaleY);
        }
        property point offset: Qt.point((width - bounds.width * scaleFactor) / 2 - bounds.minX * scaleFactor, (height - bounds.height * scaleFactor) / 2 - bounds.minY * scaleFactor)

        Repeater {
            model: root.filteredOutputs

            delegate: MonitorRect {
                required property string modelData
                outputName: modelData
                outputData: DisplayConfigState.allOutputs[modelData]
                canvasScaleFactor: canvas.scaleFactor
                canvasOffset: canvas.offset
            }
        }
    }
}