feature: implementation of xdg_activation_v1 because I want my auto f…

…ocuses (#3639)

[Screencast from 2024-10-16
16-21-05.webm](https://github.com/user-attachments/assets/86f9b0bf-181c-4aab-acfd-4ceb1e4e2c38)

## What's new?
- Added the xdg_activation_v1 protocol
- Implemented the xdg_activation_v1 protocol

## To test
- Run `miral-shell`
- Open `gnome-terminal`
- Run `gedit`
- Focus `gnome-terminal` again
- Run `gedit` again
- Note that `gedit` gets focus 🪄

Similarly:
- Open up `emacs`
- Open up `firefox`
- In emacs, write `https://google.com`
- Ctrl + Click the link
- Watch as firefox gets focus!

## Open questions
- The "timeout" is not configurable at the moment, but perhaps it should
be. However, I don't think we do per-protocol options AFAICT

## Todos
- I should probably write some WLCS tests!

src/server/frontend_wayland/CMakeLists.txt

@@ -65,6 +65,7 @@ set(
   ${PROJECT_SOURCE_DIR}/src/include/server/mir/frontend/buffer_stream.h
   wp_viewporter.cpp             wp_viewporter.h
   fractional_scale_v1.cpp           fractional_scale_v1.h
+  xdg_activation_v1.cpp         xdg_activation_v1.h
 )
 
 add_custom_command(
@@ -113,5 +114,6 @@ target_link_libraries(mirfrontend-wayland
     mircore
   PRIVATE
     PkgConfig::GIOUnix
+    PkgConfig::UUID
 )
 

src/server/frontend_wayland/wayland_connector.cpp

@@ -241,7 +241,8 @@ mf::WaylandConnector::WaylandConnector(
     WaylandProtocolExtensionFilter const& extension_filter,
     bool enable_key_repeat,
     std::shared_ptr<scene::SessionLock> const& session_lock,
-    std::shared_ptr<mir::DecorationStrategy> const& decoration_strategy)
+    std::shared_ptr<mir::DecorationStrategy> const& decoration_strategy,
+    std::shared_ptr<scene::SessionCoordinator> const& session_coordinator)
     : extension_filter{extension_filter},
       display{wl_display_create(), &cleanup_display},
       pause_signal{eventfd(0, EFD_CLOEXEC | EFD_SEMAPHORE)},
@@ -328,7 +329,9 @@ mf::WaylandConnector::WaylandConnector(
         main_loop,
         desktop_file_manager,
         session_lock_,
-        decoration_strategy});
+        decoration_strategy,
+        session_coordinator,
+        keyboard_observer_registrar});
 
     shm_global = std::make_unique<WlShm>(display.get(), executor);
 

src/server/frontend_wayland/wayland_connector.h

@@ -67,6 +67,7 @@ class IdleHub;
 class Surface;
 class TextInputHub;
 class SessionLock;
+class SessionCoordinator;
 }
 namespace time
 {
@@ -113,6 +114,8 @@ class WaylandExtensions
         std::shared_ptr<DesktopFileManager> desktop_file_manager;
         std::shared_ptr<scene::SessionLock> session_lock;
         std::shared_ptr<mir::DecorationStrategy> decoration_strategy;
+        std::shared_ptr<scene::SessionCoordinator> session_coordinator;
+        std::shared_ptr<ObserverRegistrar<input::KeyboardObserver>> keyboard_observer_registrar;
     };
 
     WaylandExtensions() = default;
@@ -165,7 +168,8 @@ class WaylandConnector : public Connector
         WaylandProtocolExtensionFilter const& extension_filter,
         bool enable_key_repeat,
         std::shared_ptr<scene::SessionLock> const& session_lock,
-        std::shared_ptr<DecorationStrategy> const& decoration_strategy);
+        std::shared_ptr<DecorationStrategy> const& decoration_strategy,
+        std::shared_ptr<scene::SessionCoordinator> const& session_coordinator);
 
     ~WaylandConnector() override;
 

src/server/frontend_wayland/wayland_default_configuration.cpp

@@ -43,6 +43,7 @@
 #include "wl_seat.h"
 #include "wl_shell.h"
 #include "wlr_screencopy_v1.h"
+#include "xdg_activation_v1.h"
 #include "xdg-decoration-unstable-v1_wrapper.h"
 #include "xdg_decoration_unstable_v1.h"
 #include "xdg_output_v1.h"
@@ -226,6 +227,16 @@ std::vector<ExtensionBuilder> const internal_extension_builders = {
         {
             return mf::create_fractional_scale_v1(ctx.display);
         }),
+    make_extension_builder<mw::XdgActivationV1>([](auto const& ctx)
+        {
+            return mf::create_xdg_activation_v1(
+                ctx.display,
+                ctx.shell,
+                ctx.session_coordinator,
+                ctx.main_loop,
+                ctx.keyboard_observer_registrar,
+                *ctx.wayland_executor);
+        }),
 };
 
 ExtensionBuilder const xwayland_builder {
@@ -327,6 +338,7 @@ auto mf::get_standard_extensions() -> std::vector<std::string>
         mw::TextInputManagerV3::interface_name,
         mw::MirShellV1::interface_name,
         mw::XdgDecorationManagerV1::interface_name,
+        mw::XdgActivationV1::interface_name,
         mw::FractionalScaleManagerV1::interface_name};
 }
 
@@ -384,7 +396,8 @@ std::shared_ptr<mf::Connector>
                 wayland_extension_filter,
                 enable_repeat,
                 the_session_lock(),
-                the_decoration_strategy());
+                the_decoration_strategy(),
+                the_session_coordinator());
         });
 }