Added SetFullScreen to GUI::Window and GLFWWindowSystem

cpp/open3d/visualization/gui/BitmapWindowSystem.h

@@ -92,6 +92,9 @@ class BitmapWindowSystem : public WindowSystem {
 
     MenuBase* CreateOSMenu() override;
 
+    /// SetFullScreen is a no-op
+    void SetFullScreen(OSWindow, bool) override{};
+
 private:
     struct Impl;
     std::unique_ptr<Impl> impl_;

cpp/open3d/visualization/gui/GLFWWindowSystem.cpp

@@ -546,6 +546,20 @@ MenuBase* GLFWWindowSystem::CreateOSMenu() {
 #endif
 }
 
+void GLFWWindowSystem::SetFullScreen(OSWindow w, bool bFullScreen) {
+    if (!bFullScreen) {
+        glfwSetWindowMonitor((GLFWwindow*)w, NULL, win_x_, win_y_, win_width_,
+                             win_height_, GLFW_DONT_CARE);
+    } else {
+        glfwGetWindowSize((GLFWwindow*)w, &win_width_, &win_height_);
+        glfwGetWindowPos((GLFWwindow*)w, &win_x_, &win_y_);
+        GLFWmonitor* monitor = glfwGetPrimaryMonitor();
+        const GLFWvidmode* mode = glfwGetVideoMode(monitor);
+        glfwSetWindowMonitor((GLFWwindow*)w, monitor, 0, 0, mode->width,
+                             mode->height, mode->refreshRate);
+    }
+}
+
 }  // namespace gui
 }  // namespace visualization
 }  // namespace open3d

cpp/open3d/visualization/gui/GLFWWindowSystem.h

@@ -70,6 +70,8 @@ class GLFWWindowSystem : public WindowSystem {
 
     MenuBase* CreateOSMenu() override;
 
+    void SetFullScreen(OSWindow w, bool bFullScreen) override;
+
 private:
     static void DrawCallback(GLFWwindow* window);
     static void ResizeCallback(GLFWwindow* window, int os_width, int os_height);
@@ -86,6 +88,11 @@ class GLFWWindowSystem : public WindowSystem {
     static void CharCallback(GLFWwindow* window, unsigned int utf32char);
     static void DragDropCallback(GLFWwindow*, int count, const char* paths[]);
     static void CloseCallback(GLFWwindow* window);
+
+    int win_width_;
+    int win_height_;
+    int win_x_;
+    int win_y_;
 };
 
 }  // namespace gui

cpp/open3d/visualization/gui/Window.cpp

@@ -676,6 +676,11 @@ void Window::ShowMenu(bool show) {
     SetNeedsLayout();
 }
 
+void Window::SetFullScreen(bool bFullScreen) {
+    auto& ws = Application::GetInstance().GetWindowSystem();
+    ws.SetFullScreen(GetOSWindow(), bFullScreen);
+}
+
 LayoutContext Window::GetLayoutContext() { return {GetTheme(), impl_->imgui_}; }
 
 void Window::Layout(const LayoutContext& context) {

cpp/open3d/visualization/gui/Window.h

@@ -162,6 +162,8 @@ class Window {
     /// WebRTCWindowSystem.
     std::string GetWebRTCUID() const;
 
+    void SetFullScreen(bool bFullScreen);
+
 protected:
     /// Returns the preferred size of the window. The window is not
     /// obligated to honor this size. If all children of the window

cpp/open3d/visualization/gui/WindowSystem.h

@@ -85,6 +85,8 @@ class WindowSystem {
                                 rendering::FilamentRenderer* renderer) = 0;
 
     virtual MenuBase* CreateOSMenu() = 0;
+
+    virtual void SetFullScreen(OSWindow w, bool bFullScreen) = 0;
 };
 
 }  // namespace gui

cpp/pybind/visualization/gui/gui.cpp

@@ -484,6 +484,9 @@ void pybind_gui_classes(py::module &m) {
                  "show_menu(show): shows or hides the menu in the window, "
                  "except on macOS since the menubar is not in the window "
                  "and all applications must have a menubar.")
+            .def("set_full_screen", &PyWindow::SetFullScreen,
+                 "Make the window fullscreen or reset to previous state.",
+                 "fullscreen"_a = true)
             .def_property_readonly(
                     "renderer", &PyWindow::GetRenderer,
                     "Gets the rendering.Renderer object for the Window");

examples/python/visualization/vis_gui.py

@@ -279,6 +279,11 @@ def __init__(self, width, height):
         h.add_stretch()
         view_ctrls.add_child(h)
 
+        self._fullscreen = gui.Checkbox("Fullscreen")
+        self._fullscreen.set_on_checked(w.set_full_screen)
+        view_ctrls.add_fixed(separation_height)
+        view_ctrls.add_child(self._fullscreen)
+
         self._show_skybox = gui.Checkbox("Show skymap")
         self._show_skybox.set_on_checked(self._on_show_skybox)
         view_ctrls.add_fixed(separation_height)