[gnome-builder/wip/libide] libide: add search shadow code

[Christian Hergert <chergert src gnome org>]

commit b84f75e23b1d4515a527a2b611bac364a06ff41d
Author: Christian Hergert <christian hergert me>
Date:   Thu Mar 12 16:24:04 2015 -0700

    libide: add search shadow code
    
    This will draw a shadowed background on the area not affected by the
    search. This will default to off, and also may not be enabled in Builder.
    However, I'd like to have the code here in case we want to interate on it.

 libide/ide-source-view.c |  112 ++++++++++++++++++++++++++++++++++++++++++++++
 libide/ide-source-view.h |    3 +
 2 files changed, 115 insertions(+), 0 deletions(-)
---
diff --git a/libide/ide-source-view.c b/libide/ide-source-view.c
index ac7924a..a81ff5b 100644
--- a/libide/ide-source-view.c
+++ b/libide/ide-source-view.c
@@ -140,6 +140,7 @@ typedef struct
   guint                        show_grid_lines : 1;
   guint                        show_line_changes : 1;
   guint                        show_search_bubbles : 1;
+  guint                        show_search_shadow : 1;
   guint                        snippet_completion : 1;
   guint                        waiting_for_capture : 1;
 } IdeSourceViewPrivate;
@@ -170,6 +171,7 @@ enum {
   PROP_SHOW_GRID_LINES,
   PROP_SHOW_LINE_CHANGES,
   PROP_SHOW_SEARCH_BUBBLES,
+  PROP_SHOW_SEARCH_SHADOW,
   PROP_SNIPPET_COMPLETION,
   LAST_PROP
 };
@@ -3725,6 +3727,17 @@ ide_source_view_draw_search_bubbles (IdeSourceView *self,
 
   cairo_region_subtract (clip_region, match_region);
 
+  if (priv->show_search_shadow &&
+      ((count > 0) || gtk_source_search_context_get_occurrences_count (priv->search_context) > 0))
+    {
+      GdkRGBA shadow;
+
+      gdk_cairo_region (cr, clip_region);
+      get_shadow_color (self, &shadow);
+      gdk_cairo_set_source_rgba (cr, &shadow);
+      cairo_fill (cr);
+    }
+
   gdk_cairo_region (cr, clip_region);
   cairo_clip (cr);
 
@@ -3777,6 +3790,47 @@ ide_source_view_real_draw_layer (GtkTextView      *text_view,
     }
 }
 
+static gboolean
+ide_source_view_real_draw (GtkWidget *widget,
+                           cairo_t   *cr)
+{
+  GtkTextView *text_view = (GtkTextView *)widget;
+  IdeSourceView *self = (IdeSourceView *)widget;
+  IdeSourceViewPrivate *priv =  ide_source_view_get_instance_private (self);
+  gboolean ret;
+
+  g_assert (GTK_IS_WIDGET (widget));
+  g_assert (GTK_IS_TEXT_VIEW (text_view));
+  g_assert (IDE_IS_SOURCE_VIEW (self));
+  g_assert (cr);
+
+  ret = GTK_WIDGET_CLASS (ide_source_view_parent_class)->draw (widget, cr);
+
+  if (priv->show_search_shadow &&
+      priv->search_context &&
+      (gtk_source_search_context_get_occurrences_count (priv->search_context) > 0))
+    {
+      GdkWindow *window;
+      GdkRGBA shadow;
+      GdkRectangle rect;
+
+      window = gtk_text_view_get_window (text_view, GTK_TEXT_WINDOW_LEFT);
+
+      gdk_window_get_position (window, &rect.x, &rect.y);
+      rect.width = gdk_window_get_width (window);
+      rect.height = gdk_window_get_height (window);
+
+      cairo_save (cr);
+      gdk_cairo_rectangle (cr, &rect);
+      get_shadow_color (self, &shadow);
+      gdk_cairo_set_source_rgba (cr, &shadow);
+      cairo_fill (cr);
+      cairo_restore (cr);
+    }
+
+  return ret;
+}
+
 static void
 ide_source_view_real_begin_macro (IdeSourceView *self)
 {
@@ -3960,6 +4014,10 @@ ide_source_view_get_property (GObject    *object,
       g_value_set_boolean (value, ide_source_view_get_show_search_bubbles (self));
       break;
 
+    case PROP_SHOW_SEARCH_SHADOW:
+      g_value_set_boolean (value, ide_source_view_get_show_search_shadow (self));
+      break;
+
     case PROP_SNIPPET_COMPLETION:
       g_value_set_boolean (value, ide_source_view_get_snippet_completion (self));
       break;
@@ -4021,6 +4079,10 @@ ide_source_view_set_property (GObject      *object,
       ide_source_view_set_show_search_bubbles (self, g_value_get_boolean (value));
       break;
 
+    case PROP_SHOW_SEARCH_SHADOW:
+      ide_source_view_set_show_search_shadow (self, g_value_get_boolean (value));
+      break;
+
     case PROP_SNIPPET_COMPLETION:
       ide_source_view_set_snippet_completion (self, g_value_get_boolean (value));
       break;
@@ -4044,6 +4106,7 @@ ide_source_view_class_init (IdeSourceViewClass *klass)
   object_class->get_property = ide_source_view_get_property;
   object_class->set_property = ide_source_view_set_property;
 
+  widget_class->draw = ide_source_view_real_draw;
   widget_class->key_press_event = ide_source_view_key_press_event;
   widget_class->query_tooltip = ide_source_view_query_tooltip;
   widget_class->style_updated = ide_source_view_real_style_updated;
@@ -4180,6 +4243,15 @@ ide_source_view_class_init (IdeSourceViewClass *klass)
   g_object_class_install_property (object_class, PROP_SHOW_SEARCH_BUBBLES,
                                    gParamSpecs [PROP_SHOW_SEARCH_BUBBLES]);
 
+  gParamSpecs [PROP_SHOW_SEARCH_SHADOW] =
+    g_param_spec_boolean ("show-search-shadow",
+                          _("Show Search Shadow"),
+                          _("If the shadow should be drawn when performing searches."),
+                          FALSE,
+                          (G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
+  g_object_class_install_property (object_class, PROP_SHOW_SEARCH_SHADOW,
+                                   gParamSpecs [PROP_SHOW_SEARCH_SHADOW]);
+
   gParamSpecs [PROP_SNIPPET_COMPLETION] =
     g_param_spec_boolean ("snippet-completion",
                           _("Snippet Completion"),
@@ -5395,3 +5467,43 @@ ide_source_view_set_show_search_bubbles (IdeSourceView *self,
       ide_source_view_invalidate_window (self);
     }
 }
+
+/**
+ * ide_source_view_get_show_search_shadow:
+ * @self: An #IdeSourceView.
+ *
+ * Gets the #IdeSourceView:show-search-shadow property.
+ *
+ * If this property is %TRUE, then when searching, a shadow will be drawn over
+ * the portion of the visible region that does not contain a match. This can
+ * be used to help bring focus to the matches.
+ *
+ * The default is %FALSE.
+ */
+gboolean
+ide_source_view_get_show_search_shadow (IdeSourceView *self)
+{
+  IdeSourceViewPrivate *priv = ide_source_view_get_instance_private (self);
+
+  g_return_val_if_fail (IDE_IS_SOURCE_VIEW (self), FALSE);
+
+  return priv->show_search_shadow;
+}
+
+void
+ide_source_view_set_show_search_shadow (IdeSourceView *self,
+                                        gboolean       show_search_shadow)
+{
+  IdeSourceViewPrivate *priv = ide_source_view_get_instance_private (self);
+
+  g_return_if_fail (IDE_IS_SOURCE_VIEW (self));
+
+  show_search_shadow = !!show_search_shadow;
+
+  if (show_search_shadow != priv->show_search_shadow)
+    {
+      priv->show_search_shadow = show_search_shadow;
+      g_object_notify_by_pspec (G_OBJECT (self), gParamSpecs [PROP_SHOW_SEARCH_SHADOW]);
+      ide_source_view_invalidate_window (self);
+    }
+}
diff --git a/libide/ide-source-view.h b/libide/ide-source-view.h
index 1688a90..158b1da 100644
--- a/libide/ide-source-view.h
+++ b/libide/ide-source-view.h
@@ -281,6 +281,7 @@ GtkSourceSearchContext     *ide_source_view_get_search_context        (IdeSource
 gboolean                    ide_source_view_get_show_grid_lines       (IdeSourceView              *self);
 gboolean                    ide_source_view_get_show_line_changes     (IdeSourceView              *self);
 gboolean                    ide_source_view_get_show_search_bubbles   (IdeSourceView              *self);
+gboolean                    ide_source_view_get_show_search_shadow    (IdeSourceView              *self);
 gboolean                    ide_source_view_get_snippet_completion    (IdeSourceView              *self);
 GType                       ide_source_view_get_type                  (void);
 void                        ide_source_view_get_visible_rect          (IdeSourceView              *self,
@@ -306,6 +307,8 @@ void                        ide_source_view_set_show_line_changes     (IdeSource
                                                                        gboolean                    
show_line_changes);
 void                        ide_source_view_set_show_search_bubbles   (IdeSourceView              *self,
                                                                        gboolean                    
show_search_bubbles);
+void                        ide_source_view_set_show_search_shadow    (IdeSourceView              *self,
+                                                                       gboolean                    
show_search_bubbles);
 void                        ide_source_view_set_snippet_completion    (IdeSourceView              *self,
                                                                        gboolean                    
snippet_completion);
 void                        ide_source_view_set_back_forward_list     (IdeSourceView              *self,