From 81839e6ebd1007f4674e65e5908ec4fd46fb64a6 Mon Sep 17 00:00:00 2001
From: Alex Valavanis <valavanisalex@gmail.com>
Date: Wed, 26 Dec 2012 12:53:09 +0000
Subject: ruler: (GIMP merge) Add track_widget API and fix GTK+ 3 build failure
 in color slider

(bzr r11988)
---
 src/widgets/ruler.cpp | 164 ++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 164 insertions(+)

(limited to 'src/widgets/ruler.cpp')

diff --git a/src/widgets/ruler.cpp b/src/widgets/ruler.cpp
index 851af640a..31ef28c61 100644
--- a/src/widgets/ruler.cpp
+++ b/src/widgets/ruler.cpp
@@ -78,6 +78,8 @@ typedef struct
   
   gint             xsrc;
   gint             ysrc;
+
+  GList           *track_widgets;
 } SPRulerPrivate;
 
 #define SP_RULER_GET_PRIVATE(ruler) \
@@ -99,6 +101,7 @@ static SPRulerMetric const sp_ruler_metrics[] = {
 };
 
 
+static void          sp_ruler_dispose              (GObject        *object);
 static void          sp_ruler_set_property         (GObject        *object,
                                                     guint           prop_id,
                                                     const GValue   *value,
@@ -158,6 +161,7 @@ sp_ruler_class_init (SPRulerClass *klass)
   GObjectClass   *object_class  = G_OBJECT_CLASS (klass);
   GtkWidgetClass *widget_class  = GTK_WIDGET_CLASS (klass);
 
+  object_class->dispose              = sp_ruler_dispose;
   object_class->set_property         = sp_ruler_set_property;
   object_class->get_property         = sp_ruler_get_property;
 
@@ -273,6 +277,18 @@ sp_ruler_init (SPRuler *ruler)
   sp_ruler_set_metric(ruler, SP_PX);
 }
 
+static void
+sp_ruler_dispose (GObject *object)
+{
+  SPRuler        *ruler = SP_RULER (object);
+  SPRulerPrivate *priv  = SP_RULER_GET_PRIVATE (ruler);
+
+  while (priv->track_widgets)
+    sp_ruler_remove_track_widget (ruler, GTK_WIDGET(priv->track_widgets->data));
+
+  G_OBJECT_CLASS (parent_class)->dispose (object);
+}
+
 
 /**
  * sp_ruler_set_range:
@@ -912,6 +928,154 @@ sp_ruler_update_position (SPRuler *ruler,
     }
 }
 
+/* Returns TRUE if a translation should be done */
+static gboolean
+gtk_widget_get_translation_to_window (GtkWidget *widget,
+		                      GdkWindow *window,
+				      int       *x,
+				      int       *y)
+{
+  GdkWindow *w, *widget_window;
+
+  if (! gtk_widget_get_has_window (widget))
+    {
+      GtkAllocation allocation;
+
+      gtk_widget_get_allocation (widget, &allocation);
+
+      *x = -allocation.x;
+      *y = -allocation.y;
+    }
+  else
+    {
+      *x = 0;
+      *y = 0;
+    }
+
+  widget_window = gtk_widget_get_window (widget);
+
+  for (w = window;
+       w && w != widget_window;
+       w = gdk_window_get_effective_parent (w))
+    {
+      gdouble px, py;
+
+      gdk_window_coords_to_parent (w, *x, *y, &px, &py);
+
+      *x += px;
+      *y += px;
+    }
+
+  if (w == NULL)
+    {
+      *x = 0;
+      *y = 0;
+      return FALSE;
+    }
+
+  return TRUE;
+}
+
+static void
+sp_ruler_event_to_widget_coords (GtkWidget *widget,
+		                 GdkWindow *window,
+				 gdouble    event_x,
+				 gdouble    event_y,
+				 gint      *widget_x,
+				 gint      *widget_y)
+{
+  gint tx, ty;
+
+  if (gtk_widget_get_translation_to_window (widget, window, &tx, &ty))
+    {
+      event_x += tx;
+      event_y += ty;
+    }
+
+  *widget_x = event_x;
+  *widget_y = event_y;
+}
+
+static gboolean
+sp_ruler_track_widget_motion_notify (GtkWidget      *widget,
+		                     GdkEventMotion *mevent,
+				     SPRuler        *ruler)
+{
+  gint widget_x;
+  gint widget_y;
+  gint ruler_x;
+  gint ruler_y;
+
+  widget = gtk_get_event_widget (reinterpret_cast<GdkEvent *>(mevent));
+
+  sp_ruler_event_to_widget_coords (widget, mevent->window,
+		                   mevent->x,  mevent->y,
+				   &widget_x, &widget_y);
+
+  if (gtk_widget_translate_coordinates (widget, GTK_WIDGET (ruler),
+			                widget_x, widget_y,
+					&ruler_x, &ruler_y))
+    {
+      sp_ruler_update_position (ruler, ruler_x, ruler_y);
+    }
+
+  return FALSE;  
+}
+
+void
+sp_ruler_add_track_widget (SPRuler   *ruler,
+		           GtkWidget *widget)
+{
+  SPRulerPrivate *priv;
+
+  g_return_if_fail (SP_IS_RULER   (ruler));
+  g_return_if_fail (GTK_IS_WIDGET (ruler));
+
+  priv = SP_RULER_GET_PRIVATE (ruler);
+  
+  g_return_if_fail (g_list_find (priv->track_widgets, widget) == NULL);
+
+  priv->track_widgets = g_list_prepend (priv->track_widgets, widget);
+
+  g_signal_connect (widget, "motion-notify-event",
+		    G_CALLBACK (sp_ruler_track_widget_motion_notify),
+		    ruler);
+  g_signal_connect (widget, "destroy",
+		    G_CALLBACK (sp_ruler_remove_track_widget),
+		    ruler);
+}
+
+/**
+ * sp_ruler_remove_track_widget:
+ * @ruler: an #SPRuler
+ * @widget: the track widget to remove
+ *
+ * Removes a previously added track widget from the ruler. See
+ * sp_ruler_add_track_widget().
+ */
+void
+sp_ruler_remove_track_widget (SPRuler   *ruler,
+		              GtkWidget *widget)
+{
+  SPRulerPrivate *priv;
+
+  g_return_if_fail (SP_IS_RULER   (ruler));
+  g_return_if_fail (GTK_IS_WIDGET (ruler));
+
+  priv = SP_RULER_GET_PRIVATE (ruler);
+
+  g_return_if_fail (g_list_find (priv->track_widgets, widget) != NULL);
+
+  priv->track_widgets = g_list_remove (priv->track_widgets, widget);
+
+  g_signal_handlers_disconnect_by_func (widget,
+		                        (gpointer) G_CALLBACK (sp_ruler_track_widget_motion_notify),
+					ruler);
+  g_signal_handlers_disconnect_by_func (widget,
+		                        (gpointer) G_CALLBACK (sp_ruler_remove_track_widget),
+					ruler);
+}
+
 /**
  * sp_ruler_set_position:
  * @ruler: a #SPRuler
-- 
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