[gnome-control-center/T20818: 7/54] shell: expose small-screen property

[Georges Basile Stavracas Neto <gbsneto src gnome org>]

commit c0f418800d54e98860fdb9fa53050bc3aa41a108
Author: Georges Basile Stavracas Neto <georges stavracas gmail com>
Date:   Tue Dec 15 14:57:46 2015 -0200

    shell: expose small-screen property
    
    By reusing the small-screen property, we
    make sure to follow only one codepath instead
    of hardcoding screen sizes multiple times.
    
    [endlessm/eos-shell#6133]

 shell/cc-shell.c  |   23 ++++++++++++
 shell/cc-shell.h  |    2 +
 shell/cc-window.c |   98 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 123 insertions(+), 0 deletions(-)
---
diff --git a/shell/cc-shell.c b/shell/cc-shell.c
index 81de92a..3bdb363 100644
--- a/shell/cc-shell.c
+++ b/shell/cc-shell.c
@@ -171,3 +171,26 @@ cc_shell_embed_widget_in_header (CcShell *shell, GtkWidget *widget)
       iface->embed_widget_in_header (shell, widget);
     }
 }
+
+gboolean
+cc_shell_is_small_screen (CcShell *shell)
+{
+  CcShellInterface *iface;
+
+  g_return_val_if_fail (CC_IS_SHELL (shell), FALSE);
+
+  iface = CC_SHELL_GET_IFACE (shell);
+
+  if (!iface->is_small_screen)
+    {
+      g_warning ("Object of type \"%s\" does not implement required interface"
+                 " method \"is_small_screen\",",
+                 G_OBJECT_TYPE_NAME (shell));
+    }
+  else
+    {
+      return iface->is_small_screen (shell);
+    }
+
+  return FALSE;
+}
diff --git a/shell/cc-shell.h b/shell/cc-shell.h
index 1786aed..273f394 100644
--- a/shell/cc-shell.h
+++ b/shell/cc-shell.h
@@ -57,6 +57,7 @@ struct _CcShellInterface
   GtkWidget * (*get_toplevel)             (CcShell      *shell);
   void        (*embed_widget_in_header)   (CcShell      *shell,
                                            GtkWidget    *widget);
+  gboolean    (*is_small_screen)          (CcShell      *shell);
 };
 
 GType           cc_shell_get_type                 (void) G_GNUC_CONST;
@@ -72,6 +73,7 @@ GtkWidget *     cc_shell_get_toplevel             (CcShell      *shell);
 
 void            cc_shell_embed_widget_in_header   (CcShell      *shell,
                                                    GtkWidget    *widget);
+gboolean        cc_shell_is_small_screen          (CcShell      *shell);
 
 G_END_DECLS
 
diff --git a/shell/cc-window.c b/shell/cc-window.c
index 7d58dd4..2e462df 100644
--- a/shell/cc-window.c
+++ b/shell/cc-window.c
@@ -41,10 +41,20 @@
 #include "cc-panel-loader.h"
 #include "cc-util.h"
 
+#define SMALL_SCREEN_WIDTH  800
+#define SMALL_SCREEN_HEIGHT 600
+
 #define MOUSE_BACK_BUTTON 8
 
 #define DEFAULT_WINDOW_ICON_NAME "preferences-system"
 
+typedef enum
+{
+  SMALL_SCREEN_UNSET,
+  SMALL_SCREEN_TRUE,
+  SMALL_SCREEN_FALSE
+} CcSmallScreen;
+
 struct _CcWindow
 {
   GtkApplicationWindow parent;
@@ -74,6 +84,9 @@ struct _CcWindow
   GtkListStore *store;
 
   CcPanel *active_panel;
+
+  gint          monitor_num;
+  CcSmallScreen small_screen;
 };
 
 static void     cc_shell_iface_init         (CcShellInterface      *iface);
@@ -92,6 +105,72 @@ static gboolean cc_window_set_active_panel_from_id (CcShell      *shell,
                                                     GVariant     *parameters,
                                                     GError      **err);
 
+static GdkRectangle
+get_monitor_rect (CcWindow *self)
+{
+  GdkScreen *screen;
+  GdkRectangle rect = { 0, };
+
+  if (self->monitor_num < 0)
+    return rect;
+
+  /* We cannot use workarea here, as this wouldn't
+   * be updated when we read it after a monitors-changed signal */
+  screen = gtk_widget_get_screen (GTK_WIDGET (self));
+
+  if (!screen)
+    return rect;
+
+  gdk_screen_get_monitor_geometry (screen, self->monitor_num, &rect);
+
+  return rect;
+}
+
+static void
+update_monitor_number (CcWindow *self)
+{
+  GtkWidget *widget;
+  GdkScreen *screen;
+  GdkWindow *window;
+
+  widget = GTK_WIDGET (self);
+
+  window = gtk_widget_get_window (widget);
+  screen = gtk_widget_get_screen (widget);
+
+  self->monitor_num = screen ? gdk_screen_get_monitor_at_window (screen, window) : -1;
+}
+
+static CcSmallScreen
+is_small (CcWindow *self)
+{
+  GdkRectangle monitor_rect = get_monitor_rect (self);
+
+  if (monitor_rect.width <= SMALL_SCREEN_WIDTH && monitor_rect.height <= SMALL_SCREEN_HEIGHT)
+    return SMALL_SCREEN_TRUE;
+
+  return SMALL_SCREEN_FALSE;
+}
+
+static void
+update_small_screen_settings (CcWindow *self)
+{
+  CcSmallScreen small;
+
+  update_monitor_number (self);
+  small = is_small (self);
+
+  if (self->small_screen != small)
+    {
+      if (small == SMALL_SCREEN_TRUE)
+        gtk_window_maximize (GTK_WINDOW (self));
+      else
+        gtk_window_unmaximize (GTK_WINDOW (self));
+    }
+
+  self->small_screen = small;
+}
+
 static const gchar *
 get_icon_name_from_g_icon (GIcon *gicon)
 {
@@ -474,6 +553,12 @@ _shell_get_toplevel (CcShell *shell)
   return GTK_WIDGET (shell);
 }
 
+static gboolean
+_shell_is_small_screen (CcShell *shell)
+{
+  return CC_WINDOW (shell)->small_screen == SMALL_SCREEN_TRUE;
+}
+
 static void
 gdk_window_set_cb (GObject    *object,
                    GParamSpec *pspec,
@@ -609,6 +694,16 @@ cc_shell_iface_init (CcShellInterface *iface)
   iface->set_active_panel_from_id = _shell_set_active_panel_from_id;
   iface->embed_widget_in_header = _shell_embed_widget_in_header;
   iface->get_toplevel = _shell_get_toplevel;
+  iface->is_small_screen = _shell_is_small_screen;
+}
+
+static gboolean
+cc_window_configure_event (GtkWidget         *widget,
+                           GdkEventConfigure *event)
+{
+  update_small_screen_settings (CC_WINDOW (widget));
+
+  return GDK_EVENT_PROPAGATE;
 }
 
 static void
@@ -622,6 +717,8 @@ cc_window_class_init (CcWindowClass *klass)
   object_class->dispose = cc_window_dispose;
   object_class->finalize = cc_window_finalize;
 
+  widget_class->configure_event = cc_window_configure_event;
+
   g_object_class_override_property (object_class, PROP_ACTIVE_PANEL, "active-panel");
 
   gtk_widget_class_set_template_from_resource (widget_class, "/org/gnome/ControlCenter/gtk/window.ui");
@@ -815,6 +912,7 @@ cc_window_init (CcWindow *self)
 
   create_window (self);
 
+  self->monitor_num = -1;
   self->previous_panels = g_queue_new ();
 
   /* keep a list of custom widgets to unload on panel change */