diff --git a/Applications/QuickShow/QSWidget.cpp b/Applications/QuickShow/QSWidget.cpp
index dfd60759f7..06cdb91ea5 100644
--- a/Applications/QuickShow/QSWidget.cpp
+++ b/Applications/QuickShow/QSWidget.cpp
@@ -160,6 +160,11 @@ void QSWidget::resize_event(GUI::ResizeEvent& event)
     GUI::Widget::resize_event(event);
 }
 
+void QSWidget::doubleclick_event(GUI::MouseEvent&)
+{
+    on_doubleclick();
+}
+
 void QSWidget::paint_event(GUI::PaintEvent& event)
 {
     Frame::paint_event(event);
diff --git a/Applications/QuickShow/QSWidget.h b/Applications/QuickShow/QSWidget.h
index eade0a5ba1..432446c806 100644
--- a/Applications/QuickShow/QSWidget.h
+++ b/Applications/QuickShow/QSWidget.h
@@ -57,10 +57,12 @@ public:
     void load_from_file(const String&);
 
     Function<void(int)> on_scale_change;
+    Function<void()> on_doubleclick;
     Function<void(const GUI::DropEvent&)> on_drop;
 
 private:
     QSWidget();
+    virtual void doubleclick_event(GUI::MouseEvent&) override;
     virtual void paint_event(GUI::PaintEvent&) override;
     virtual void resize_event(GUI::ResizeEvent&) override;
     virtual void mousedown_event(GUI::MouseEvent&) override;
diff --git a/Applications/QuickShow/main.cpp b/Applications/QuickShow/main.cpp
index edf032b173..7430cbfa8b 100644
--- a/Applications/QuickShow/main.cpp
+++ b/Applications/QuickShow/main.cpp
@@ -103,6 +103,10 @@ int main(int argc, char** argv)
             }
         }
     };
+    widget.on_doubleclick = [&] {
+        window->set_fullscreen(!window->is_fullscreen());
+        toolbar_container.set_visible(!window->is_fullscreen());
+    };
 
     // Actions
     auto open_action = GUI::CommonActions::make_open_action(
@@ -192,8 +196,7 @@ int main(int argc, char** argv)
 
     auto full_sceen_action = GUI::CommonActions::make_fullscreen_action(
         [&](auto&) {
-            window->set_fullscreen(!window->is_fullscreen());
-            toolbar_container.set_visible(!window->is_fullscreen());
+            widget.on_doubleclick();
         });
 
     auto zoom_in_action = GUI::Action::create("Zoom In", { Mod_None, Key_Plus }, Gfx::Bitmap::load_from_file("/res/icons/16x16/zoom-in.png"),