Background child property for pages, sets window background.

The current page's background property controls the background of the
window. EosWindow listens in on the page mangers notify signals to
update its background.
[endlessm/eos-sdk#59]

1 files changed, 75 insertions, 3 deletions

diff --git a/endless/eoswindow.c b/endless/eoswindow.c
index a42d883..a739a60 100644
--- a/endless/eoswindow.c
+++ b/endless/eoswindow.c
@@ -4,6 +4,7 @@
 #include "eoswindow.h"
 
 #include "eosapplication.h"
+#include "eospagemanager.h"
 #include "eostopbar-private.h"
 #include "eosmainarea-private.h"
 
@@ -32,6 +33,8 @@
  * ]|
  */
 
+#define _BACKGROUND_IMAGE_CSS_TEMPLATE "EosWindow { background-image: url(\"%s\"); }"
+
 G_DEFINE_TYPE (EosWindow, eos_window, GTK_TYPE_APPLICATION_WINDOW)
 
 #define WINDOW_PRIVATE(o) \
@@ -48,8 +51,9 @@ struct _EosWindowPrivate
 
   /* For keeping track of what to display alongside the current page */
   GtkWidget *current_page;
-  gulong     child_page_actions_handler;
-  gulong     child_custom_toolbox_handler;
+  gulong child_page_actions_handler;
+  gulong child_custom_toolbox_handler;
+  GtkCssProvider *background_provider;
 };
 
 enum
@@ -319,6 +323,71 @@ eos_window_forall (GtkContainer *container,
 }
 
 static void
+set_background_to_page (EosWindow      *self,
+                        EosPageManager *page_manager)
+{
+  gint length;
+  GError *error = NULL;
+  GtkCssProvider *provider = self->priv->background_provider;
+  GdkScreen *screen = gdk_screen_get_default ();
+  GtkWidget *visible_page = eos_page_manager_get_visible_page (page_manager);
+  const gchar *background;
+  gchar background_css[128];
+
+  if (visible_page != NULL)
+    {
+      background = eos_page_manager_get_page_background (page_manager, visible_page);
+      length = sprintf (background_css, _BACKGROUND_IMAGE_CSS_TEMPLATE, background);
+      gtk_style_context_remove_provider_for_screen (screen, GTK_STYLE_PROVIDER (provider));
+      gtk_css_provider_load_from_data (provider,
+                                       background_css,
+                                       length,
+                                       &error);
+      gtk_style_context_add_provider_for_screen (screen,
+                                                 GTK_STYLE_PROVIDER (provider),
+                                                 GTK_STYLE_PROVIDER_PRIORITY_APPLICATION);
+      if (error != NULL)
+        {
+          g_error ("%s", error->message);
+        }
+    }
+}
+
+static void
+on_background_changed_cb (GtkWidget  *child,
+                          GParamSpec *pspec,
+                          gpointer    user_data)
+{
+  if (user_data != NULL)
+    set_background_to_page (EOS_WINDOW (user_data), EOS_PAGE_MANAGER (child));
+}
+
+static void
+eos_window_add (GtkContainer *container,
+                GtkWidget    *widget)
+{
+  if (EOS_IS_PAGE_MANAGER (widget))
+    {
+      set_background_to_page (EOS_WINDOW (container), EOS_PAGE_MANAGER (widget));
+      g_signal_connect (widget, "notify::visible-page",
+                        G_CALLBACK (on_background_changed_cb), container);
+    }
+  GTK_CONTAINER_CLASS (eos_window_parent_class)->add (container, widget);
+}
+
+static void
+eos_window_remove (GtkContainer *container,
+                   GtkWidget    *widget)
+{
+  /* This should be safe to call even if @widget is not a page manager or even
+  an actual child of @container. */
+  g_signal_handlers_disconnect_by_func (widget,
+                                        on_background_changed_cb,
+                                        container);
+  GTK_CONTAINER_CLASS (eos_window_parent_class)->remove (container, widget);
+}
+
+static void
 eos_window_class_init (EosWindowClass *klass)
 {
   GObjectClass *object_class = G_OBJECT_CLASS (klass);
@@ -339,6 +408,8 @@ eos_window_class_init (EosWindowClass *klass)
   widget_class->unmap = eos_window_unmap;
   widget_class->show = eos_window_show;
   container_class->forall = eos_window_forall;
+  container_class->add = eos_window_add;
+  container_class->remove = eos_window_remove;
 
   /**
    * EosWindow:application:
@@ -392,6 +463,7 @@ eos_window_init (EosWindow *self)
 {
   self->priv = WINDOW_PRIVATE (self);
 
+  self->priv->background_provider = gtk_css_provider_new ();
   self->priv->top_bar = eos_top_bar_new ();
   gtk_widget_set_parent (self->priv->top_bar, GTK_WIDGET (self));
 
@@ -470,4 +542,4 @@ eos_window_set_page_manager (EosWindow *self,
 
   g_signal_connect_swapped (self->priv->page_manager, "notify::visible-page",
                             G_CALLBACK (update_page), self);
-}
\ No newline at end of file
+}