feat(lockscreen): enable use of videos as screensaver in the lock screen (#1819)

* feat(lockscreen): enable use of videos as screensaver in the lock screen

* reducing debug logs

* feature becomes available only when QtMultimedia is available

quickshell/Modules/Lock/LockSurface.qml

@@ -2,8 +2,9 @@ pragma ComponentBehavior: Bound
 
 import QtQuick
 import Quickshell.Wayland
+import qs.Common
 
-Rectangle {
+FocusScope {
     id: root
 
     required property WlSessionLock lock
@@ -14,7 +15,17 @@ Rectangle {
     signal passwordChanged(string newPassword)
     signal unlockRequested
 
-    color: "transparent"
+    Keys.onPressed: event => {
+        if (videoScreensaver.active && videoScreensaver.inputEnabled) {
+            videoScreensaver.dismiss();
+            event.accepted = true;
+        }
+    }
+
+    Rectangle {
+        anchors.fill: parent
+        color: "transparent"
+    }
 
     LockScreenContent {
         id: lockContent
@@ -23,17 +34,38 @@ Rectangle {
         demoMode: false
         passwordBuffer: root.sharedPasswordBuffer
         screenName: root.screenName
+        enabled: !videoScreensaver.active
+        focus: !videoScreensaver.active
+        opacity: videoScreensaver.active ? 0 : 1
         onUnlockRequested: root.unlockRequested()
         onPasswordBufferChanged: {
             if (root.sharedPasswordBuffer !== passwordBuffer) {
                 root.passwordChanged(passwordBuffer);
             }
         }
+
+        Behavior on opacity {
+            NumberAnimation {
+                duration: 200
+            }
+        }
     }
 
+    VideoScreensaver {
+        id: videoScreensaver
+        anchors.fill: parent
+        screenName: root.screenName
+    }
+
+    Component.onCompleted: forceActiveFocus()
+
     onIsLockedChanged: {
         if (isLocked) {
+            forceActiveFocus();
             lockContent.resetLockState();
+            if (SettingsData.lockScreenVideoEnabled) {
+                videoScreensaver.start();
+            }
             return;
         }
         lockContent.unlocking = false;