WindowServer: Allow changing frameless state after a window is created

Userland/Libraries/LibGUI/Window.cpp

@@ -871,6 +871,16 @@ void Window::set_fullscreen(bool fullscreen)
     WindowServerConnection::the().send_sync<Messages::WindowServer::SetFullscreen>(m_window_id, fullscreen);
 }
 
+void Window::set_frameless(bool frameless)
+{
+    if (m_frameless == frameless)
+        return;
+    m_frameless = frameless;
+    if (!is_visible())
+        return;
+    WindowServerConnection::the().send_sync<Messages::WindowServer::SetFrameless>(m_window_id, frameless);
+}
+
 bool Window::is_maximized() const
 {
     if (!is_visible())

Userland/Libraries/LibGUI/Window.h

@@ -58,7 +58,7 @@ public:
     bool is_maximized() const;
 
     bool is_frameless() const { return m_frameless; }
-    void set_frameless(bool frameless) { m_frameless = frameless; }
+    void set_frameless(bool);
 
     bool is_resizable() const { return m_resizable; }
     void set_resizable(bool resizable) { m_resizable = resizable; }

Userland/Services/WindowServer/ClientConnection.cpp

@@ -286,6 +286,18 @@ OwnPtr<Messages::WindowServer::SetFullscreenResponse> ClientConnection::handle(c
     return make<Messages::WindowServer::SetFullscreenResponse>();
 }
 
+OwnPtr<Messages::WindowServer::SetFramelessResponse> ClientConnection::handle(const Messages::WindowServer::SetFrameless& message)
+{
+    auto it = m_windows.find(message.window_id());
+    if (it == m_windows.end()) {
+        did_misbehave("SetFrameless: Bad window ID");
+        return {};
+    }
+    it->value->set_frameless(message.frameless());
+    WindowManager::the().tell_wm_listeners_window_state_changed(*it->value);
+    return make<Messages::WindowServer::SetFramelessResponse>();
+}
+
 OwnPtr<Messages::WindowServer::SetWindowOpacityResponse> ClientConnection::handle(const Messages::WindowServer::SetWindowOpacity& message)
 {
     auto it = m_windows.find(message.window_id());

Userland/Services/WindowServer/ClientConnection.h

@@ -125,6 +125,7 @@ private:
     virtual OwnPtr<Messages::WindowServer::SetWindowAlphaHitThresholdResponse> handle(const Messages::WindowServer::SetWindowAlphaHitThreshold&) override;
     virtual OwnPtr<Messages::WindowServer::MoveWindowToFrontResponse> handle(const Messages::WindowServer::MoveWindowToFront&) override;
     virtual OwnPtr<Messages::WindowServer::SetFullscreenResponse> handle(const Messages::WindowServer::SetFullscreen&) override;
+    virtual OwnPtr<Messages::WindowServer::SetFramelessResponse> handle(const Messages::WindowServer::SetFrameless&) override;
     virtual void handle(const Messages::WindowServer::AsyncSetWallpaper&) override;
     virtual OwnPtr<Messages::WindowServer::SetBackgroundColorResponse> handle(const Messages::WindowServer::SetBackgroundColor&) override;
     virtual OwnPtr<Messages::WindowServer::SetWallpaperModeResponse> handle(const Messages::WindowServer::SetWallpaperMode&) override;

Userland/Services/WindowServer/Window.cpp

@@ -500,6 +500,19 @@ void Window::set_visible(bool b)
         Compositor::the().invalidate_screen(frame().render_rect());
 }
 
+void Window::set_frameless(bool frameless)
+{
+    if (m_frameless == frameless)
+        return;
+    auto render_rect_before = frame().render_rect();
+    m_frameless = frameless;
+    if (m_visible) {
+        Compositor::the().invalidate_occlusions();
+        invalidate(true, true);
+        Compositor::the().invalidate_screen(frameless ? render_rect_before : frame().render_rect());
+    }
+}
+
 void Window::invalidate(bool invalidate_frame, bool re_render_frame)
 {
     m_invalidated = true;

Userland/Services/WindowServer/Window.h

@@ -299,7 +299,7 @@ public:
     bool is_accessory() const;
     bool is_accessory_of(Window&) const;
 
-    void set_frameless(bool frameless) { m_frameless = frameless; }
+    void set_frameless(bool);
     bool is_frameless() const { return m_frameless; }
 
     int progress() const { return m_progress; }

Userland/Services/WindowServer/WindowServer.ipc

@@ -88,6 +88,7 @@ endpoint WindowServer = 2
     SetWindowHasAlphaChannel(i32 window_id, bool has_alpha_channel) => ()
     MoveWindowToFront(i32 window_id) => ()
     SetFullscreen(i32 window_id, bool fullscreen) => ()
+    SetFrameless(i32 window_id, bool frameless) => ()
     PopupMenu(i32 menu_id, Gfx::IntPoint screen_position) => ()
     DismissMenu(i32 menu_id) => ()