[gnome-builder/editor-layout] editor: plumb support for scrolling to target line

[Christian Hergert <chergert src gnome org>]

commit 029cfc210422c8d0eeec3710e49fcc838f4506da
Author: Christian Hergert <christian hergert me>
Date:   Sun Nov 30 23:40:14 2014 -0800

    editor: plumb support for scrolling to target line

 src/editor/gb-editor-tab.c |   29 +++++++++++++++++++++++++++++
 src/editor/gb-editor-tab.h |   23 +++++++++++++----------
 2 files changed, 42 insertions(+), 10 deletions(-)
---
diff --git a/src/editor/gb-editor-tab.c b/src/editor/gb-editor-tab.c
index 149a157..8b7c25e 100644
--- a/src/editor/gb-editor-tab.c
+++ b/src/editor/gb-editor-tab.c
@@ -338,6 +338,35 @@ gb_editor_tab_get_last_frame (GbEditorTab *tab)
   return tab->priv->frame;
 }
 
+void
+gb_editor_tab_scroll_to_line (GbEditorTab *tab,
+                              guint        line,
+                              guint        line_offset)
+{
+  GbEditorFrame *frame;
+  GtkTextIter iter;
+
+  g_return_if_fail (GB_IS_EDITOR_TAB (tab));
+
+  frame = gb_editor_tab_get_last_frame (tab);
+
+  gtk_text_buffer_get_iter_at_line (GTK_TEXT_BUFFER (tab->priv->document),
+                                    &iter, line);
+  for (; line_offset; line_offset--)
+    {
+      if (gtk_text_iter_ends_line (&iter))
+        break;
+      if (!gtk_text_iter_forward_char (&iter))
+        break;
+    }
+
+  gtk_text_buffer_select_range (GTK_TEXT_BUFFER (tab->priv->document),
+                                &iter, &iter);
+
+  gtk_text_view_scroll_to_iter (GTK_TEXT_VIEW (frame->priv->source_view), &iter,
+                                0.0, FALSE, 0.0, 0.5);
+}
+
 static void
 gb_editor_tab_scroll (GbEditorTab      *tab,
                       GtkDirectionType  dir)
diff --git a/src/editor/gb-editor-tab.h b/src/editor/gb-editor-tab.h
index 11b9c66..f35627f 100644
--- a/src/editor/gb-editor-tab.h
+++ b/src/editor/gb-editor-tab.h
@@ -51,16 +51,19 @@ struct _GbEditorTabClass
   GbTabClass parent_class;
 };
 
-GbEditorTab *gb_editor_tab_new          (void);
-GType        gb_editor_tab_get_type     (void) G_GNUC_CONST;
-void         gb_editor_tab_save         (GbEditorTab *tab);
-void         gb_editor_tab_save_as      (GbEditorTab *tab);
-void         gb_editor_tab_open_file    (GbEditorTab *tab,
-                                         GFile       *file);
-void         gb_editor_tab_scroll_up    (GbEditorTab *tab);
-void         gb_editor_tab_scroll_down  (GbEditorTab *tab);
-void         gb_editor_tab_toggle_split (GbEditorTab *tab);
-void         gb_editor_tab_find         (GbEditorTab *tab);
+GbEditorTab *gb_editor_tab_new            (void);
+GType        gb_editor_tab_get_type       (void) G_GNUC_CONST;
+void         gb_editor_tab_save           (GbEditorTab *tab);
+void         gb_editor_tab_save_as        (GbEditorTab *tab);
+void         gb_editor_tab_open_file      (GbEditorTab *tab,
+                                           GFile       *file);
+void         gb_editor_tab_scroll_up      (GbEditorTab *tab);
+void         gb_editor_tab_scroll_down    (GbEditorTab *tab);
+void         gb_editor_tab_toggle_split   (GbEditorTab *tab);
+void         gb_editor_tab_find           (GbEditorTab *tab);
+void         gb_editor_tab_scroll_to_line (GbEditorTab *tab,
+                                           guint        line,
+                                           guint        line_offset);
 
 G_END_DECLS