VideoPlayer: Add button and menu item to toggle fullscreen

Add a button to the bottom toolbar and a menu item to toggle fullscreen.
Also implement toggling fullscreen mode by double-clicking the video.

Userland/Applications/VideoPlayer/VideoFrameWidget.cpp

@@ -45,6 +45,12 @@ void VideoFrameWidget::mousedown_event(GUI::MouseEvent&)
         on_click();
 }
 
+void VideoFrameWidget::doubleclick_event(GUI::MouseEvent&)
+{
+    if (on_doubleclick)
+        on_doubleclick();
+}
+
 void VideoFrameWidget::paint_event(GUI::PaintEvent& event)
 {
     Frame::paint_event(event);

Userland/Applications/VideoPlayer/VideoFrameWidget.h

@@ -35,11 +35,13 @@ public:
     bool auto_resize() const { return m_auto_resize; }
 
     Function<void()> on_click;
+    Function<void()> on_doubleclick;
 
 protected:
     explicit VideoFrameWidget();
 
     virtual void mousedown_event(GUI::MouseEvent&) override;
+    virtual void doubleclick_event(GUI::MouseEvent&) override;
     virtual void paint_event(GUI::PaintEvent&) override;
 
 private:

Userland/Applications/VideoPlayer/VideoPlayerWidget.cpp

@@ -35,6 +35,7 @@ ErrorOr<void> VideoPlayerWidget::setup_interface()
 {
     m_video_display = find_descendant_of_type_named<VideoPlayer::VideoFrameWidget>("video_frame");
     m_video_display->on_click = [&]() { toggle_pause(); };
+    m_video_display->on_doubleclick = [&]() { toggle_fullscreen(); };
 
     m_seek_slider = find_descendant_of_type_named<GUI::HorizontalSlider>("seek_slider");
     m_seek_slider->on_drag_start = [&]() {
@@ -72,10 +73,15 @@ ErrorOr<void> VideoPlayerWidget::setup_interface()
         cycle_sizing_modes();
     });
 
+    m_toggle_fullscreen_action = GUI::CommonActions::make_fullscreen_action([&](auto&) {
+        toggle_fullscreen();
+    });
+
     m_timestamp_label = find_descendant_of_type_named<GUI::Label>("timestamp");
     m_volume_slider = find_descendant_of_type_named<GUI::HorizontalSlider>("volume_slider");
     find_descendant_of_type_named<GUI::Button>("playback")->set_action(*m_play_pause_action);
     find_descendant_of_type_named<GUI::Button>("sizing")->set_action(*m_cycle_sizing_modes_action);
+    find_descendant_of_type_named<GUI::Button>("fullscreen")->set_action(*m_toggle_fullscreen_action);
 
     return {};
 }
@@ -250,6 +256,16 @@ void VideoPlayerWidget::cycle_sizing_modes()
     m_video_display->update();
 }
 
+void VideoPlayerWidget::toggle_fullscreen()
+{
+    auto* parent_window = window();
+    parent_window->set_fullscreen(!parent_window->is_fullscreen());
+    auto* bottom_container = find_descendant_of_type_named<GUI::Widget>("bottom_container");
+    bottom_container->set_visible(!parent_window->is_fullscreen());
+    auto* video_frame = find_descendant_of_type_named<VideoFrameWidget>("video_frame");
+    video_frame->set_frame_thickness(parent_window->is_fullscreen() ? 0 : 2);
+}
+
 void VideoPlayerWidget::update_title()
 {
     StringBuilder string_builder;
@@ -298,6 +314,10 @@ ErrorOr<void> VideoPlayerWidget::initialize_menubar(GUI::Window& window)
     TRY(playback_menu->try_add_action(*m_use_fast_seeking));
     set_seek_mode(Video::PlaybackManager::DEFAULT_SEEK_MODE);
 
+    // View menu
+    auto view_menu = TRY(window.try_add_menu("&View"));
+    TRY(view_menu->try_add_action(*m_toggle_fullscreen_action));
+
     // Help menu
     auto help_menu = TRY(window.try_add_menu("&Help"));
     TRY(help_menu->try_add_action(GUI::CommonActions::make_about_action("Video Player", TRY(GUI::Icon::try_create_default_icon("app-video-player"sv)), &window)));

Userland/Applications/VideoPlayer/VideoPlayerWidget.h

@@ -49,6 +49,8 @@ private:
 
     void cycle_sizing_modes();
 
+    void toggle_fullscreen();
+
     void event(Core::Event&) override;
 
     DeprecatedString m_path;
@@ -66,6 +68,8 @@ private:
 
     RefPtr<GUI::Action> m_use_fast_seeking;
 
+    RefPtr<GUI::Action> m_toggle_fullscreen_action;
+
     OwnPtr<Video::PlaybackManager> m_playback_manager;
 
     bool m_was_playing_before_seek { false };

Userland/Applications/VideoPlayer/VideoPlayerWindow.gml

@@ -8,6 +8,7 @@
     }
 
     @GUI::Widget {
+        name: "bottom_container"
         max_height: 50
         layout: @GUI::VerticalBoxLayout {}
 
@@ -53,6 +54,15 @@
                     max: 100
                     fixed_width: 100
                 }
+
+                @GUI::VerticalSeparator {}
+
+                @GUI::Button {
+                    name: "fullscreen"
+                    icon: "/res/icons/16x16/fullscreen.png"
+                    fixed_width: 24
+                    button_style: "Coolbar"
+                }
             }
         }
     }