[gtk+] GtkWindow: add up CSD size in gtk_window_resize()

[Olivier Fourdan <ofourdan src gnome org>]

commit 3450f53907a15877dd4d7fef15c00af680811aa3
Author: Olivier Fourdan <ofourdan redhat com>
Date:   Thu Oct 15 11:25:51 2015 +0200

    GtkWindow: add up CSD size in gtk_window_resize()
    
    When client side decoration is used, the size passed to
    gtk_window_resize() or retrieved from gtk_window_get_size() for top-
    level windows also accounts for the client side decorations widgets
    such as the title bar or the shadow borders.
    
    Add up the size of these additional controls to the given size to get
    the size expected.
    
    Bugzilla: https://bugzilla.gnome.org/show_bug.cgi?id=756618

 gtk/gtkwindow.c |   60 ++++++++++++++++++++++++++++++++++++++++++++++++++++++-
 1 files changed, 59 insertions(+), 1 deletions(-)
---
diff --git a/gtk/gtkwindow.c b/gtk/gtkwindow.c
index 15076db..d056bee 100644
--- a/gtk/gtkwindow.c
+++ b/gtk/gtkwindow.c
@@ -5190,6 +5190,43 @@ gtk_window_get_default_size (GtkWindow *window,
     *height = info ? info->default_height : -1;
 }
 
+#define INCLUDE_CSD_SIZE 1
+#define EXCLUDE_CSD_SIZE -1
+
+static void
+gtk_window_update_csd_size (GtkWindow *window,
+                            gint      *width,
+                            gint      *height,
+                            gint       apply)
+{
+  GtkWindowPrivate *priv = window->priv;
+  GtkBorder window_border = { 0 };
+
+  if (priv->decorated &&
+      !priv->fullscreen)
+    {
+      get_shadow_width (window, &window_border);
+      *width += apply * (window_border.left + window_border.right);
+      *height += apply * (window_border.top + window_border.bottom);
+
+      if (priv->title_box != NULL &&
+          gtk_widget_get_visible (priv->title_box) &&
+          gtk_widget_get_child_visible (priv->title_box))
+        {
+          gint minimum_height;
+          gint natural_height;
+
+          gtk_widget_get_preferred_height (priv->title_box, &minimum_height, &natural_height);
+          *height += apply * natural_height;
+        }
+    }
+  /* Make sure the size remains acceptable */
+  if (*width < 1)
+    *width = 1;
+  if (*height < 1)
+    *height = 1;
+}
+
 /**
  * gtk_window_resize:
  * @window: a #GtkWindow
@@ -5208,6 +5245,14 @@ gtk_window_get_default_size (GtkWindow *window,
  *
  * Windows may not be resized smaller than 1 by 1 pixels.
  * 
+ * When using client side decorations, GTK+ will do its best to adjust
+ * the given size so that the resulting window size matches the
+ * requested size without the title bar, borders and shadows added for
+ * the client side decorations, but there is no garantee that the
+ * result will be totally accurate because these widgets added for
+ * client side decorations depend on the theme and may not be realized
+ * or visible at the time gtk_window_resize() is issued.
+ *
  **/
 void
 gtk_window_resize (GtkWindow *window,
@@ -5221,6 +5266,7 @@ gtk_window_resize (GtkWindow *window,
   g_return_if_fail (height > 0);
 
   info = gtk_window_get_geometry_info (window, TRUE);
+  gtk_window_update_csd_size (window, &width, &height, INCLUDE_CSD_SIZE);
 
   info->resize_width = width;
   info->resize_height = height;
@@ -5308,6 +5354,13 @@ gtk_window_resize_to_geometry (GtkWindow *window,
  * of the window decorations/border into account, while your
  * application cannot.
  *
+ * Note 4: When using client side decorations, GTK+ will do its best to
+ * adjust the returned values to match the logical size of the window
+ * excluding the widgets added for client side decorations, but there
+ * is no garantee that the result will be totally accurate because
+ * these widgets depend on the theme and may not be realized or
+ * visible at the time gtk_window_get_size() is invoked.
+ *
  * In any case, if you insist on application-specified window
  * positioning, there’s still a better way than
  * doing it yourself - gtk_window_set_position() will frequently
@@ -5342,13 +5395,18 @@ gtk_window_get_size (GtkWindow *window,
       w = configure_request.width;
       h = configure_request.height;
     }
-  
+
+  gtk_window_update_csd_size (window, &w, &h, EXCLUDE_CSD_SIZE);
+
   if (width)
     *width = w;
   if (height)
     *height = h;
 }
 
+#undef INCLUDE_CSD_SIZE
+#undef EXCLUDE_CSD_SIZE
+
 /**
  * gtk_window_move:
  * @window: a #GtkWindow