Add overlay and oneshot crosshair

Overlay.qml

@@ -0,0 +1,56 @@
+import QtQuick
+import Quickshell
+import Quickshell.Hyprland
+import Quickshell.Io
+import QtQuick.Effects
+import Quickshell.Widgets
+import Quickshell.Wayland
+
+FloatingWindow {
+    id: overlay
+    visible: toplevel
+    color: "transparent"
+    property var toplevel: null
+    title: "monoverlay"
+
+    Process {
+        id: slurp
+        command: ['sh', '-c', "slurp -f %x,%y,%w,%h </dev/null"]
+        stdout: StdioCollector { onStreamFinished: {
+            let [x, y, w, h] = this.text.split(',')
+            const toplevel = Hyprland.activeToplevel
+            const {at, size} = toplevel.lastIpcObject
+            x -= at[0]
+            y -= at[1]
+            source.sourceRect = Qt.rect(x, y, w, h)
+            console.log(x, y, w, h, toplevel)
+            overlay.toplevel = toplevel.wayland
+        }}
+    }
+
+    IpcHandler {
+        target: "overlay"
+        function open() {slurp.running = true}
+    }
+
+    ScreencopyView {
+        id: view
+        visible: false
+        layer.enabled: true
+        width: sourceSize.width
+        height: sourceSize.height
+        // layer.effect: ShaderEffect {
+        //     fragmentShader: "discord.frag.qsb"
+        //     property color bgcol: "#111111"
+        // }
+        live: true
+        captureSource: overlay.toplevel
+    }
+    ShaderEffectSource {
+        id: source
+        anchors.fill: parent
+        sourceItem: view
+    }
+
+    onClosed: toplevel = null
+}