DankMaterialShell/quickshell/Common/OSDManager.qml

pragma Singleton

import Quickshell
import QtQuick

Singleton {
    id: osdManager

    property var currentOSDsByScreen: ({})

    function showOSD(osd) {
        if (!osd || !osd.screen)
            return

        const screenName = osd.screen.name
        const currentOSD = currentOSDsByScreen[screenName]

        if (currentOSD && currentOSD !== osd) {
            currentOSD.hide()
        }

        currentOSDsByScreen[screenName] = osd
    }
}