add support for full screen mode

Nowadays, there are several UVC devices that can be used to
capture HDMI images. Those could be used, for instance, to
display a console from another machine. On such case, it can
be interesting to use as little as possible of the screen,
in order to maximize the screen.

Let's implement a full screen mode that will disable everything
but the top menu, and place the application in full screen
mode.

As this depends on a proper scaling support, only enable it
with Gtk3.

Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>

4 files changed, 126 insertions, 2 deletions

diff --git a/data/camorama-gtk3.ui b/data/camorama-gtk3.ui
index 826fb59..7d98b72 100644
--- a/data/camorama-gtk3.ui
+++ b/data/camorama-gtk3.ui
@@ -39,6 +39,11 @@
     <property name="can_focus">False</property>
     <property name="pixbuf">snap-icon-small.xpm</property>
   </object>
+  <object class="GtkImage" id="image23">
+    <property name="visible">True</property>
+    <property name="can_focus">False</property>
+    <property name="icon_name">view-fullscreen</property>
+  </object>
   <object class="GtkWindow" id="main_window">
     <property name="can_focus">False</property>
     <property name="title" translatable="yes">Camorama-libglade</property>
@@ -80,6 +85,17 @@
                       </object>
                     </child>
                     <child>
+                      <object class="GtkImageMenuItem" id="imagemenuitem2">
+                        <property name="label" translatable="yes">Toggle _Full Screen</property>
+                        <property name="visible">True</property>
+                        <property name="can_focus">False</property>
+                        <property name="use_underline">True</property>
+                        <property name="image">image23</property>
+                        <property name="use_stock">False</property>
+                        <accelerator key="f" signal="activate" modifiers="GDK_CONTROL_MASK"/>
+                      </object>
+                    </child>
+                    <child>
                       <object class="GtkSeparatorMenuItem" id="menuitem2">
                         <property name="visible">True</property>
                         <property name="can_focus">False</property>
@@ -346,6 +362,68 @@
               </packing>
             </child>
             <child>
+              <object class="GtkAlignment" id="alignment6">
+                <property name="visible">True</property>
+                <property name="can_focus">False</property>
+                <property name="halign">center</property>
+                <property name="hexpand">True</property>
+                <child>
+                  <object class="GtkButton" id="button3">
+                    <property name="visible">True</property>
+                    <property name="can_focus">True</property>
+                    <property name="receives_default">False</property>
+                    <property name="halign">center</property>
+                    <signal name="clicked" handler="capture_func" swapped="no"/>
+                    <child>
+                      <object class="GtkAlignment" id="alignment5">
+                        <property name="visible">True</property>
+                        <property name="can_focus">False</property>
+                        <property name="xscale">0</property>
+                        <property name="yscale">0</property>
+                        <child>
+                          <object class="GtkBox" id="hbox34">
+                            <property name="visible">True</property>
+                            <property name="can_focus">False</property>
+                            <property name="spacing">2</property>
+                            <child>
+                              <object class="GtkImage" id="image22">
+                                <property name="visible">True</property>
+                                <property name="can_focus">False</property>
+                                <property name="icon_name">view-fullscreen</property>
+                              </object>
+                              <packing>
+                                <property name="expand">False</property>
+                                <property name="fill">False</property>
+                                <property name="position">0</property>
+                              </packing>
+                            </child>
+                            <child>
+                              <object class="GtkLabel" id="label77">
+                                <property name="visible">True</property>
+                                <property name="can_focus">False</property>
+                                <property name="label" translatable="yes">Full Screen</property>
+                                <property name="use_underline">True</property>
+                              </object>
+                              <packing>
+                                <property name="expand">False</property>
+                                <property name="fill">False</property>
+                                <property name="position">2</property>
+                              </packing>
+                            </child>
+                          </object>
+                        </child>
+                      </object>
+                    </child>
+                  </object>
+                </child>
+              </object>
+              <packing>
+                <property name="expand">False</property>
+                <property name="fill">False</property>
+                <property name="position">1</property>
+              </packing>
+            </child>
+            <child>
               <object class="GtkAlignment" id="alignment2">
                 <property name="visible">True</property>
                 <property name="can_focus">False</property>
@@ -402,7 +480,7 @@
                 <property name="expand">False</property>
                 <property name="fill">False</property>
                 <property name="pack_type">end</property>
-                <property name="position">1</property>
+                <property name="position">2</property>
               </packing>
             </child>
           </object>
diff --git a/src/callbacks.c b/src/callbacks.c
index b4ee1bf..603351c 100644
--- a/src/callbacks.c
+++ b/src/callbacks.c
@@ -353,7 +353,7 @@ static void get_geometry(cam_t *cam, unsigned int *width, unsigned int *height)
 #endif
 }
 
-gboolean on_configure_event(GtkMenuItem *menuitem, GdkEvent  *event, cam_t *cam)
+gboolean on_configure_event(GtkMenuItem *menuitem, GdkEvent *event, cam_t *cam)
 {
 #if GTK_MAJOR_VERSION >= 3
     GtkWidget *da = GTK_WIDGET(gtk_builder_get_object(cam->xml, "da"));
@@ -386,6 +386,42 @@ gboolean on_configure_event(GtkMenuItem *menuitem, GdkEvent  *event, cam_t *cam)
     return FALSE;
 }
 
+gboolean on_window_state_event(GtkMenuItem *menuitem,
+			       GdkEventWindowState *event, cam_t *cam)
+{
+#if GTK_MAJOR_VERSION >= 3
+    if (event->new_window_state & GDK_WINDOW_STATE_FULLSCREEN) {
+	gtk_widget_hide(GTK_WIDGET(gtk_builder_get_object(cam->xml, "menuitem3")));
+	gtk_widget_hide(GTK_WIDGET(gtk_builder_get_object(cam->xml, "menuitem4")));
+	gtk_widget_hide(GTK_WIDGET(gtk_builder_get_object(cam->xml, "hbox31")));
+	gtk_widget_hide(cam->status);
+    } else {
+	gtk_widget_show(GTK_WIDGET(gtk_builder_get_object(cam->xml, "menuitem3")));
+	gtk_widget_show(GTK_WIDGET(gtk_builder_get_object(cam->xml, "menuitem4")));
+	gtk_widget_show(GTK_WIDGET(gtk_builder_get_object(cam->xml, "hbox31")));
+	gtk_widget_show(cam->status);
+    }
+#endif
+
+    return GDK_EVENT_PROPAGATE;
+}
+
+void toggle_fullscreen(GtkWidget *widget, cam_t *cam)
+{
+    GdkWindowState state;
+    GtkWidget *window = GTK_WIDGET(gtk_builder_get_object(cam->xml,
+                                                          "main_window"));
+
+    state = gdk_window_get_state (gtk_widget_get_window (GTK_WIDGET (window)));
+
+    if (state & GDK_WINDOW_STATE_FULLSCREEN) {
+	gtk_window_unfullscreen(GTK_WINDOW(window));
+    } else {
+	gtk_window_fullscreen(GTK_WINDOW(window));
+    }
+}
+
+
 void set_image_scale(cam_t *cam)
 {
     float f;
diff --git a/src/callbacks.h b/src/callbacks.h
index 4f11587..a23df4d 100644
--- a/src/callbacks.h
+++ b/src/callbacks.h
@@ -18,6 +18,8 @@ G_BEGIN_DECLS
 void on_change_size_activate(GtkWidget * widget, cam_t *cam);
 void on_quit_activate(GtkMenuItem *menuitem, cam_t *cam);
 gboolean on_configure_event(GtkMenuItem *menuitem, GdkEvent *event, cam_t *cam);
+gboolean on_window_state_event(GtkMenuItem *menuitem,
+			       GdkEventWindowState *event, cam_t *cam);
 int delete_event(GtkWidget *, gpointer data);
 void cap_func(GtkWidget *, cam_t *);
 void rcap_func(GtkWidget *, cam_t *);
@@ -48,6 +50,7 @@ gboolean delete_event_prefs_window(GtkWidget *widget, GdkEvent *event,
                                    cam_t *cam);
 void capture_func2(GtkWidget *, cam_t *);
 void capture_func(GtkWidget *, cam_t *);
+void toggle_fullscreen(GtkWidget *, cam_t *);
 gint timeout_capture_func(cam_t *);
 gint fps(GtkWidget *);
 gint timeout_func(cam_t *);
diff --git a/src/camorama-window.c b/src/camorama-window.c
index 8f05d78..7e69e36 100644
--- a/src/camorama-window.c
+++ b/src/camorama-window.c
@@ -516,5 +516,12 @@ void load_interface(cam_t *cam)
     // Detect window resize calls
     g_signal_connect(GTK_WIDGET(gtk_builder_get_object(cam->xml, "da")),
 		     "configure-event", G_CALLBACK(on_configure_event), cam);
+    g_signal_connect(window, "window-state-event",
+		     G_CALLBACK(on_window_state_event), cam);
+
+    g_signal_connect(gtk_builder_get_object(cam->xml, "button3"),
+                     "clicked", G_CALLBACK(toggle_fullscreen), cam);
+    g_signal_connect(gtk_builder_get_object(cam->xml, "imagemenuitem2"),
+		     "activate", G_CALLBACK(toggle_fullscreen), cam);
 #endif
 }