10 files changed, 62 insertions, 0 deletions
diff --git a/Userland/Libraries/LibGUI/Event.h b/Userland/Libraries/LibGUI/Event.h
index e2a0cd520b..8a2b732773 100644
--- a/Userland/Libraries/LibGUI/Event.h
+++ b/Userland/Libraries/LibGUI/Event.h
@@ -56,6 +56,7 @@ public:
         ScreenRectsChange,
         ActionEnter,
         ActionLeave,
+        AppletAreaRectChange,
 
         __Begin_WM_Events,
         WM_WindowRemoved,
@@ -451,6 +452,20 @@ private:
     size_t m_main_screen_index;
 };
 
+class AppletAreaRectChangeEvent final : public Event {
+public:
+    explicit AppletAreaRectChangeEvent(Gfx::IntRect rect)
+        : Event(Type::AppletAreaRectChange)
+        , m_rect(rect)
+    {
+    }
+
+    Gfx::IntRect rect() const { return m_rect; }
+
+private:
+    Gfx::IntRect const m_rect;
+};
+
 class FocusEvent final : public Event {
 public:
     explicit FocusEvent(Type type, FocusSource source)
diff --git a/Userland/Libraries/LibGUI/Forward.h b/Userland/Libraries/LibGUI/Forward.h
index 21e0c77f06..ac629e035f 100644
--- a/Userland/Libraries/LibGUI/Forward.h
+++ b/Userland/Libraries/LibGUI/Forward.h
@@ -13,6 +13,7 @@ class AbstractTableView;
 class AbstractView;
 class Action;
 class ActionGroup;
+class AppletAreaRectChangeEvent;
 class Application;
 class AutocompleteBox;
 class AutocompleteProvider;
diff --git a/Userland/Libraries/LibGUI/Widget.cpp b/Userland/Libraries/LibGUI/Widget.cpp
index 52bb229f5c..71362ff939 100644
--- a/Userland/Libraries/LibGUI/Widget.cpp
+++ b/Userland/Libraries/LibGUI/Widget.cpp
@@ -305,6 +305,8 @@ void Widget::event(Core::Event& event)
         return change_event(static_cast<Event&>(event));
     case Event::ContextMenu:
         return context_menu_event(static_cast<ContextMenuEvent&>(event));
+    case Event::AppletAreaRectChange:
+        return applet_area_rect_change_event(static_cast<AppletAreaRectChangeEvent&>(event));
     default:
         return Core::Object::event(event);
     }
@@ -579,6 +581,10 @@ void Widget::screen_rects_change_event(ScreenRectsChangeEvent&)
 {
 }
 
+void Widget::applet_area_rect_change_event(AppletAreaRectChangeEvent&)
+{
+}
+
 void Widget::update()
 {
     if (rect().is_empty())
diff --git a/Userland/Libraries/LibGUI/Widget.h b/Userland/Libraries/LibGUI/Widget.h
index 86b353b5a0..d88a70dfec 100644
--- a/Userland/Libraries/LibGUI/Widget.h
+++ b/Userland/Libraries/LibGUI/Widget.h
@@ -319,6 +319,7 @@ protected:
     virtual void theme_change_event(ThemeChangeEvent&);
     virtual void fonts_change_event(FontsChangeEvent&);
     virtual void screen_rects_change_event(ScreenRectsChangeEvent&);
+    virtual void applet_area_rect_change_event(AppletAreaRectChangeEvent&);
 
     virtual void did_begin_inspection() override;
     virtual void did_end_inspection() override;
diff --git a/Userland/Libraries/LibGUI/Window.cpp b/Userland/Libraries/LibGUI/Window.cpp
index 3156e0f04f..3d926eabd1 100644
--- a/Userland/Libraries/LibGUI/Window.cpp
+++ b/Userland/Libraries/LibGUI/Window.cpp
@@ -550,6 +550,22 @@ void Window::handle_screen_rects_change_event(ScreenRectsChangeEvent& event)
     screen_rects_change_event(event);
 }
 
+void Window::handle_applet_area_rect_change_event(AppletAreaRectChangeEvent& event)
+{
+    if (!m_main_widget)
+        return;
+    auto dispatch_applet_area_rect_change = [&](auto& widget, auto recursive) {
+        widget.dispatch_event(event, this);
+        widget.for_each_child_widget([&](auto& widget) -> IterationDecision {
+            widget.dispatch_event(event, this);
+            recursive(widget, recursive);
+            return IterationDecision::Continue;
+        });
+    };
+    dispatch_applet_area_rect_change(*m_main_widget.ptr(), dispatch_applet_area_rect_change);
+    applet_area_rect_change_event(event);
+}
+
 void Window::handle_drag_move_event(DragEvent& event)
 {
     if (!m_main_widget)
@@ -640,6 +656,9 @@ void Window::event(Core::Event& event)
     if (event.type() == Event::ScreenRectsChange)
         return handle_screen_rects_change_event(static_cast<ScreenRectsChangeEvent&>(event));
 
+    if (event.type() == Event::AppletAreaRectChange)
+        return handle_applet_area_rect_change_event(static_cast<AppletAreaRectChangeEvent&>(event));
+
     Core::Object::event(event);
 }
 
@@ -878,6 +897,10 @@ void Window::screen_rects_change_event(ScreenRectsChangeEvent&)
 {
 }
 
+void Window::applet_area_rect_change_event(AppletAreaRectChangeEvent&)
+{
+}
+
 void Window::set_icon(const Gfx::Bitmap* icon)
 {
     if (m_icon == icon)
diff --git a/Userland/Libraries/LibGUI/Window.h b/Userland/Libraries/LibGUI/Window.h
index a6d5b3db8b..013bb4fbe3 100644
--- a/Userland/Libraries/LibGUI/Window.h
+++ b/Userland/Libraries/LibGUI/Window.h
@@ -207,6 +207,7 @@ protected:
     Window(Core::Object* parent = nullptr);
     virtual void wm_event(WMEvent&);
     virtual void screen_rects_change_event(ScreenRectsChangeEvent&);
+    virtual void applet_area_rect_change_event(AppletAreaRectChangeEvent&);
 
     virtual void enter_event(Core::Event&);
     virtual void leave_event(Core::Event&);
@@ -226,6 +227,7 @@ private:
     void handle_theme_change_event(ThemeChangeEvent&);
     void handle_fonts_change_event(FontsChangeEvent&);
     void handle_screen_rects_change_event(ScreenRectsChangeEvent&);
+    void handle_applet_area_rect_change_event(AppletAreaRectChangeEvent&);
     void handle_drag_move_event(DragEvent&);
     void handle_entered_event(Core::Event&);
     void handle_left_event(Core::Event&);
diff --git a/Userland/Libraries/LibGUI/WindowServerConnection.cpp b/Userland/Libraries/LibGUI/WindowServerConnection.cpp
index 7462e0cc8c..a06f9bde20 100644
--- a/Userland/Libraries/LibGUI/WindowServerConnection.cpp
+++ b/Userland/Libraries/LibGUI/WindowServerConnection.cpp
@@ -321,6 +321,13 @@ void WindowServerConnection::screen_rects_changed(Vector<Gfx::IntRect> const& re
     });
 }
 
+void WindowServerConnection::applet_area_rect_changed(Gfx::IntRect const& rect)
+{
+    Window::for_each_window({}, [&](auto& window) {
+        Core::EventLoop::current().post_event(window, make<AppletAreaRectChangeEvent>(rect));
+    });
+}
+
 void WindowServerConnection::set_wallpaper_finished(bool)
 {
     // This is handled manually by Desktop::set_wallpaper().
diff --git a/Userland/Libraries/LibGUI/WindowServerConnection.h b/Userland/Libraries/LibGUI/WindowServerConnection.h
index 91a5bbc195..f9d4b92751 100644
--- a/Userland/Libraries/LibGUI/WindowServerConnection.h
+++ b/Userland/Libraries/LibGUI/WindowServerConnection.h
@@ -46,6 +46,7 @@ private:
     virtual void menu_item_left(i32, u32) override;
     virtual void menu_visibility_did_change(i32, bool) override;
     virtual void screen_rects_changed(Vector<Gfx::IntRect> const&, u32, u32, u32) override;
+    virtual void applet_area_rect_changed(Gfx::IntRect const&) override;
     virtual void set_wallpaper_finished(bool) override;
     virtual void drag_dropped(i32, Gfx::IntPoint const&, String const&, HashMap<String, ByteBuffer> const&) override;
     virtual void drag_accepted() override;
diff --git a/Userland/Services/WindowServer/WMClientConnection.cpp b/Userland/Services/WindowServer/WMClientConnection.cpp
index 9aaba46b64..55ba25189d 100644
--- a/Userland/Services/WindowServer/WMClientConnection.cpp
+++ b/Userland/Services/WindowServer/WMClientConnection.cpp
@@ -42,6 +42,10 @@ void WMClientConnection::set_applet_area_position(Gfx::IntPoint const& position)
     }
 
     AppletManager::the().set_position(position);
+
+    WindowServer::ClientConnection::for_each_client([](auto& connection) {
+        connection.post_message(Messages::WindowClient::AppletAreaRectChanged(AppletManager::the().window()->rect()));
+    });
 }
 
 void WMClientConnection::set_active_window(i32 client_id, i32 window_id)
diff --git a/Userland/Services/WindowServer/WindowClient.ipc b/Userland/Services/WindowServer/WindowClient.ipc
index 61b9911316..2b8b3c839f 100644
--- a/Userland/Services/WindowServer/WindowClient.ipc
+++ b/Userland/Services/WindowServer/WindowClient.ipc
@@ -30,6 +30,8 @@ endpoint WindowClient
 
     screen_rects_changed(Vector<Gfx::IntRect> rects, u32 main_screen_index, u32 virtual_desktop_rows, u32 virtual_desktop_columns) =|
 
+    applet_area_rect_changed(Gfx::IntRect rect) =|
+
     set_wallpaper_finished(bool success) =|
 
     drag_accepted() =|