[gtk+/wip/scrolledwindow-overlay-on-captured] scrolledwindow: make it a windowed widget again

[Carlos Garnacho <carlosg src gnome org>]

commit 59482c41dfc0d1b12b61e7f717d7e589d9931670
Author: Carlos Garnacho <carlosg gnome org>
Date:   Mon Dec 1 13:23:57 2014 +0100

    scrolledwindow: make it a windowed widget again
    
    This is so we can detect crossing events on the scrolledwindow widget,
    which can be useful for toggling certain behaviors or not depending on
    whether the mouse is on the widget.

 gtk/gtkscrolledwindow.c |   50 +++++++++++++++++++++++++++++++++++-----------
 1 files changed, 38 insertions(+), 12 deletions(-)
---
diff --git a/gtk/gtkscrolledwindow.c b/gtk/gtkscrolledwindow.c
index 4dadbad..1ccd4f2 100644
--- a/gtk/gtkscrolledwindow.c
+++ b/gtk/gtkscrolledwindow.c
@@ -961,10 +961,10 @@ event_close_to_indicator (GtkScrolledWindow *sw,
       y < 0 || y > alloc.height)
     return FALSE;
 
-  if (x > win_x - alloc.x - 50 &&
-      x < win_x - alloc.x + indicator_alloc.width + 50 &&
-      y > win_y - alloc.y - 50 &&
-      y < win_y - alloc.y + indicator_alloc.height + 50)
+  if (x > win_x - 50 &&
+      x < win_x + indicator_alloc.width + 50 &&
+      y > win_y - 50 &&
+      y < win_y + indicator_alloc.height + 50)
     return TRUE;
 
   return FALSE;
@@ -1037,7 +1037,7 @@ gtk_scrolled_window_init (GtkScrolledWindow *scrolled_window)
   scrolled_window->priv = priv =
     gtk_scrolled_window_get_instance_private (scrolled_window);
 
-  gtk_widget_set_has_window (widget, FALSE);
+  gtk_widget_set_has_window (widget, TRUE);
   gtk_widget_set_can_focus (widget, TRUE);
 
   /* Instantiated by gtk_scrolled_window_set_[hv]adjustment
@@ -2292,8 +2292,8 @@ gtk_scrolled_window_allocate_child (GtkScrolledWindow *swindow,
 
   gtk_scrolled_window_relative_allocation (widget, relative_allocation);
 
-  child_allocation.x = relative_allocation->x + allocation.x;
-  child_allocation.y = relative_allocation->y + allocation.y;
+  child_allocation.x = relative_allocation->x;
+  child_allocation.y = relative_allocation->y;
   child_allocation.width = relative_allocation->width;
   child_allocation.height = relative_allocation->height;
 
@@ -2322,6 +2322,13 @@ gtk_scrolled_window_size_allocate (GtkWidget     *widget,
   bin = GTK_BIN (scrolled_window);
   priv = scrolled_window->priv;
 
+  if (gtk_widget_get_realized (widget))
+    {
+      gdk_window_move_resize (gtk_widget_get_window (widget),
+                              allocation->x, allocation->y,
+                              allocation->width, allocation->height);
+    }
+
   /* Get possible scrollbar dimensions */
   sb_spacing = _gtk_scrolled_window_get_scrollbar_spacing (scrolled_window);
   gtk_widget_get_preferred_height (priv->hscrollbar, &sb_height, NULL);
@@ -2569,8 +2576,6 @@ gtk_scrolled_window_size_allocate (GtkWidget     *widget,
 
       child_allocation.width = relative_allocation.width;
       child_allocation.height = sb_height;
-      child_allocation.x += allocation->x;
-      child_allocation.y += allocation->y;
 
       if (priv->shadow_type != GTK_SHADOW_NONE)
        {
@@ -2626,8 +2631,6 @@ gtk_scrolled_window_size_allocate (GtkWidget     *widget,
       child_allocation.y = relative_allocation.y;
       child_allocation.width = sb_width;
       child_allocation.height = relative_allocation.height;
-      child_allocation.x += allocation->x;
-      child_allocation.y += allocation->y;
 
       if (priv->shadow_type != GTK_SHADOW_NONE)
        {
@@ -3837,8 +3840,31 @@ gtk_scrolled_window_realize (GtkWidget *widget)
   GtkScrolledWindow *scrolled_window = GTK_SCROLLED_WINDOW (widget);
   GtkScrolledWindowPrivate *priv = scrolled_window->priv;
   GdkDeviceManager *dm;
+  GdkWindow *window;
+  GtkAllocation allocation;
+  GdkWindowAttr attributes;
+  gint attributes_mask;
+
+  gtk_widget_get_allocation (widget, &allocation);
+
+  attributes.window_type = GDK_WINDOW_CHILD;
+  attributes.wclass = GDK_INPUT_OUTPUT;
 
-  GTK_WIDGET_CLASS (gtk_scrolled_window_parent_class)->realize (widget);
+  attributes.width = allocation.width;
+  attributes.height = allocation.height;
+  attributes.x = allocation.x;
+  attributes.y = allocation.y;
+  attributes.visual = gtk_widget_get_visual (widget);
+  attributes_mask = GDK_WA_X | GDK_WA_Y | GDK_WA_VISUAL;
+  attributes.event_mask = gtk_widget_get_events (widget) | GDK_EXPOSURE_MASK |
+    GDK_ENTER_NOTIFY_MASK | GDK_LEAVE_NOTIFY_MASK;
+
+  window = gdk_window_new (gtk_widget_get_parent_window (widget),
+                           &attributes, attributes_mask);
+
+  gtk_widget_set_window (widget, window);
+  gtk_widget_register_window (widget, window);
+  gtk_widget_set_realized (widget, TRUE);
 
   priv->hindicator.window = create_indicator_window (scrolled_window, priv->hscrollbar);
   priv->vindicator.window = create_indicator_window (scrolled_window, priv->vscrollbar);