--- a/libervia/web/pages/calls/_browser/__init__.py	Wed Aug 09 00:48:21 2023 +0200
+++ b/libervia/web/pages/calls/_browser/__init__.py	Mon Aug 14 16:49:02 2023 +0200
@@ -15,15 +15,18 @@
 bridge = Bridge()
 GATHER_TIMEOUT = 10000
 ALLOWED_STATUSES = (None, "dialing")
-AUDIO = 'audio'
-VIDEO = 'video'
+AUDIO = "audio"
+VIDEO = "video"
 ALLOWED_CALL_MODES = {AUDIO, VIDEO}
+INACTIVE_CLASS = "inactive"
+MUTED_CLASS = "muted"
+SCREEN_OFF_CLASS = "screen-off"
 
 
 class CallUI:
-
     def __init__(self):
         self.webrtc = WebRTC()
+        self.webrtc.screen_sharing_cb = self.on_sharing_screen
         self.mode = "search"
         self._status = None
         self._callee = None
@@ -44,42 +47,34 @@
         self._call_mode = VIDEO
         self.call_button_tpl = Template("call/call_button.html")
         self._update_call_button()
-        document['toggle_call_mode_btn'].bind('click', self.switch_call_mode)
-        document["hangup_btn"].bind(
-            "click",
-            lambda __: aio.run(self.hang_up())
-        )
+        document["toggle_call_mode_btn"].bind("click", self.switch_call_mode)
+        document["hangup_btn"].bind("click", lambda __: aio.run(self.hang_up()))
 
         # other buttons
-        document["full_screen_btn"].bind(
-            "click",
-            lambda __: self.toggle_fullscreen()
-        )
+        document["full_screen_btn"].bind("click", lambda __: self.toggle_fullscreen())
         document["exit_full_screen_btn"].bind(
-            "click",
-            lambda __: self.toggle_fullscreen()
+            "click", lambda __: self.toggle_fullscreen()
         )
-        document["mute_audio_btn"].bind(
-            "click",
-            self.toggle_audio_mute
-        )
-        document["mute_video_btn"].bind(
-            "click",
-            self.toggle_video_mute
-        )
+        document["mute_audio_btn"].bind("click", self.toggle_audio_mute)
+        document["mute_video_btn"].bind("click", self.toggle_video_mute)
+        self.share_desktop_btn_elt = document["share_desktop_btn"]
+        if hasattr(window.navigator.mediaDevices, "getDisplayMedia"):
+            self.share_desktop_btn_elt.classList.remove("is-hidden-touch")
+            # screen sharing is supported
+            self.share_desktop_btn_elt.bind("click", self.toggle_screen_sharing)
+        else:
+            self.share_desktop_btn_elt.classList.add("is-hidden")
 
         # search
         self.jid_search = JidSearch(
-            document["search"],
-            document["contacts"],
-            click_cb = self._on_entity_click
+            document["search"], document["contacts"], click_cb=self._on_entity_click
         )
 
         # incoming call dialog
         self.incoming_call_dialog_elt = None
 
     @property
-    def sid(self) -> str|None:
+    def sid(self) -> str | None:
         return self.webrtc.sid
 
     @sid.setter
@@ -97,10 +92,7 @@
                 raise Exception(
                     f"INTERNAL ERROR: this status is not allowed: {new_status!r}"
                 )
-            tpl_data = {
-                "entity": self._callee,
-                "status": new_status
-            }
+            tpl_data = {"entity": self._callee, "status": new_status}
             if self._callee is not None:
                 try:
                     tpl_data["name"] = cache.identities[self._callee]["nicknames"][0]
@@ -110,7 +102,6 @@
             self.call_status_wrapper_elt.clear()
             self.call_status_wrapper_elt <= status_elt
 
-
         self._status = new_status
 
     @property
@@ -139,10 +130,9 @@
     def _update_call_button(self):
         new_button = self.call_button_tpl.get_elt({"call_mode": self.call_mode})
         new_button.bind(
-            "click",
-            lambda __: aio.run(self.make_call(video=not self.call_mode == AUDIO))
+            "click", lambda __: aio.run(self.make_call(video=not self.call_mode == AUDIO))
         )
-        document['call_btn'].replaceWith(new_button)
+        document["call_btn"].replaceWith(new_button)
 
     def _on_action_new(
         self, action_data_s: str, action_id: str, security_limit: int, profile: str
@@ -161,9 +151,7 @@
 
     async def on_action_new(self, action_data: dict, action_id: str) -> None:
         peer_jid = action_data["from_jid"]
-        log.info(
-            f"{peer_jid} wants to start a call ({action_data['sub_type']})"
-        )
+        log.info(f"{peer_jid} wants to start a call ({action_data['sub_type']})")
         if self.sid is not None:
             log.warning(
                 f"already in a call ({self.sid}), can't receive a new call from "
@@ -173,7 +161,7 @@
         sid = self.sid = action_data["session_id"]
         await cache.fill_identities([peer_jid])
         identity = cache.identities[peer_jid]
-        peer_name = identity['nicknames'][0]
+        peer_name = identity["nicknames"][0]
 
         # we start the ring
         self.audio_player_elt.play()
@@ -181,19 +169,14 @@
         # and ask user if we take the call
         try:
             self.incoming_call_dialog_elt = dialog.Confirm(
-                f"{peer_name} is calling you.",
-                ok_label="Answer",
-                cancel_label="Reject"
+                f"{peer_name} is calling you.", ok_label="Answer", cancel_label="Reject"
             )
             accepted = await self.incoming_call_dialog_elt.ashow()
         except dialog.CancelError:
             log.info("Call has been cancelled")
             self.incoming_call_dialog_elt = None
             self.sid = None
-            dialog.notification.show(
-                f"{peer_name} has cancelled the call",
-                level="info"
-            )
+            dialog.notification.show(f"{peer_name} has cancelled the call", level="info")
             return
 
         self.incoming_call_dialog_elt = None
@@ -210,10 +193,7 @@
         else:
             log.info(f"your are declining the call from {peer_jid}")
             self.sid = None
-        await bridge.action_launch(
-            action_id,
-            json.dumps({"cancelled": not accepted})
-        )
+        await bridge.action_launch(action_id, json.dumps({"cancelled": not accepted}))
 
     def _on_call_ended(self, session_id: str, data_s: str, profile: str) -> None:
         """Call has been terminated
@@ -241,7 +221,9 @@
         """
         aio.run(self.on_call_setup(session_id, json.loads(setup_data_s), profile))
 
-    async def on_call_setup(self, session_id: str, setup_data: dict, profile: str) -> None:
+    async def on_call_setup(
+        self, session_id: str, setup_data: dict, profile: str
+    ) -> None:
         """Call has been accepted, connection can be established
 
         @param session_id: Session identifier
@@ -260,8 +242,7 @@
             sdp = setup_data["sdp"]
         except KeyError:
             dialog.notification.show(
-                f"Invalid setup data received: {setup_data}",
-                level="error"
+                f"Invalid setup data received: {setup_data}", level="error"
             )
             return
         if role == "initiator":
@@ -270,8 +251,7 @@
             await self.webrtc.answer_call(session_id, sdp, profile)
         else:
             dialog.notification.show(
-                f"Invalid role received during setup: {setup_data}",
-                level="error"
+                f"Invalid role received during setup: {setup_data}", level="error"
             )
             return
 
@@ -287,22 +267,22 @@
                 raise ValueError
         except ValueError:
             dialog.notification.show(
-                "Invalid identifier, please use a valid callee identifier",
-                level="error"
+                "Invalid identifier, please use a valid callee identifier", level="error"
             )
             return
 
         self._callee = callee_jid
         await cache.fill_identities([callee_jid])
         self.status = "dialing"
-        call_avatar_elt = self.call_avatar_tpl.get_elt({
-            "entity": str(callee_jid),
-            "identities": cache.identities,
-        })
+        call_avatar_elt = self.call_avatar_tpl.get_elt(
+            {
+                "entity": str(callee_jid),
+                "identities": cache.identities,
+            }
+        )
         self.call_avatar_wrapper_elt.clear()
         self.call_avatar_wrapper_elt <= call_avatar_elt
 
-
         self.switch_mode("call")
         await self.webrtc.make_call(callee_jid, audio, video)
 
@@ -335,16 +315,13 @@
             log.warning("Can't hand_up, not call in progress")
             return
         await self.end_call({"reason": "terminated"})
-        await bridge.call_end(
-            session_id,
-            ""
-        )
+        await bridge.call_end(session_id, "")
 
     def _handle_animation_end(
         self,
         element,
-        remove = None,
-        add = None,
+        remove=None,
+        add=None,
     ):
         """Return a handler that removes specified classes and the event handler.
 
@@ -352,6 +329,7 @@
         @param remove: List of class names to remove from the element.
         @param add: List of class names to add to the element.
         """
+
         def handler(__, remove=remove, add=add):
             log.info(f"animation end OK {element=}")
             if add:
@@ -362,7 +340,7 @@
                 if isinstance(remove, str):
                     remove = [remove]
                 element.classList.remove(*remove)
-            element.unbind('animationend', handler)
+            element.unbind("animationend", handler)
 
         return handler
 
@@ -374,21 +352,16 @@
             # Hide contacts with fade-out animation and bring up the call box
             self.search_container_elt.classList.add("fade-out-y")
             self.search_container_elt.bind(
-                'animationend',
+                "animationend",
                 self._handle_animation_end(
-                    self.search_container_elt,
-                    remove="fade-out-y",
-                    add="is-hidden"
-                )
+                    self.search_container_elt, remove="fade-out-y", add="is-hidden"
+                ),
             )
             self.call_container_elt.classList.remove("is-hidden")
             self.call_container_elt.classList.add("slide-in")
             self.call_container_elt.bind(
-                'animationend',
-                self._handle_animation_end(
-                    self.call_container_elt,
-                    remove="slide-in"
-                )
+                "animationend",
+                self._handle_animation_end(self.call_container_elt, remove="slide-in"),
             )
             self.mode = mode
         elif mode == "search":
@@ -396,26 +369,26 @@
             self.search_container_elt.classList.add("fade-out-y", "animation-reverse")
             self.search_container_elt.classList.remove("is-hidden")
             self.search_container_elt.bind(
-                'animationend',
+                "animationend",
                 self._handle_animation_end(
                     self.search_container_elt,
                     remove=["fade-out-y", "animation-reverse"],
-                )
+                ),
             )
             self.call_container_elt.classList.add("slide-in", "animation-reverse")
             self.call_container_elt.bind(
-                'animationend',
+                "animationend",
                 self._handle_animation_end(
                     self.call_container_elt,
                     remove=["slide-in", "animation-reverse"],
-                    add="is-hidden"
-                )
+                    add="is-hidden",
+                ),
             )
             self.mode = mode
         else:
             log.error(f"Internal Error: Unknown call mode: {mode}")
 
-    def toggle_fullscreen(self, fullscreen: bool|None = None):
+    def toggle_fullscreen(self, fullscreen: bool | None = None):
         """Toggle fullscreen mode for video elements.
 
         @param fullscreen: if set, determine the fullscreen state; otherwise,
@@ -439,8 +412,7 @@
 
         except Exception as e:
             dialog.notification.show(
-                f"An error occurred while toggling fullscreen: {e}",
-                level="error"
+                f"An error occurred while toggling fullscreen: {e}", level="error"
             )
 
     def toggle_audio_mute(self, evt):
@@ -448,14 +420,14 @@
         btn_elt = evt.currentTarget
         if is_muted:
             btn_elt.classList.remove("is-success")
-            btn_elt.classList.add("muted", "is-warning")
+            btn_elt.classList.add(INACTIVE_CLASS, MUTED_CLASS, "is-warning")
             dialog.notification.show(
                 f"audio is now muted",
                 level="info",
                 delay=2,
             )
         else:
-            btn_elt.classList.remove("muted", "is-warning")
+            btn_elt.classList.remove(INACTIVE_CLASS, MUTED_CLASS, "is-warning")
             btn_elt.classList.add("is-success")
 
     def toggle_video_mute(self, evt):
@@ -463,16 +435,29 @@
         btn_elt = evt.currentTarget
         if is_muted:
             btn_elt.classList.remove("is-success")
-            btn_elt.classList.add("muted", "is-warning")
+            btn_elt.classList.add(INACTIVE_CLASS, MUTED_CLASS, "is-warning")
             dialog.notification.show(
                 f"video is now muted",
                 level="info",
                 delay=2,
             )
         else:
-            btn_elt.classList.remove("muted", "is-warning")
+            btn_elt.classList.remove(INACTIVE_CLASS, MUTED_CLASS, "is-warning")
             btn_elt.classList.add("is-success")
 
+    def toggle_screen_sharing(self, evt):
+        aio.run(self.webrtc.toggle_screen_sharing())
+
+    def on_sharing_screen(self, sharing: bool) -> None:
+        """Called when screen sharing state changes"""
+        share_desktop_btn_elt = self.share_desktop_btn_elt
+        if sharing:
+            share_desktop_btn_elt.classList.add("is-danger")
+            share_desktop_btn_elt.classList.remove(INACTIVE_CLASS, SCREEN_OFF_CLASS)
+        else:
+            share_desktop_btn_elt.classList.remove("is-danger")
+            share_desktop_btn_elt.classList.add(INACTIVE_CLASS, SCREEN_OFF_CLASS)
+
     def _on_entity_click(self, item: dict) -> None:
         aio.run(self.on_entity_click(item))