[evince] libview: Position the caret cursor by clicking

[Carlos Garcia Campos <carlosgc src gnome org>]

commit 153e67d384b54c81bc769ffca5e242566caf2e57
Author: Antia Puentes <apuentes igalia com>
Date:   Mon Jun 17 18:26:41 2013 +0200

    libview: Position the caret cursor by clicking
    
    https://bugzilla.gnome.org/show_bug.cgi?id=702071

 libview/ev-view.c |   53 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 files changed, 53 insertions(+), 0 deletions(-)
---
diff --git a/libview/ev-view.c b/libview/ev-view.c
index 984ef61..9d2a9df 100644
--- a/libview/ev-view.c
+++ b/libview/ev-view.c
@@ -4022,6 +4022,51 @@ start_selection_for_event (EvView         *view,
 }
 
 static gboolean
+get_caret_cursor_offset_at_location (EvView *view,
+                                    gdouble x,
+                                    gdouble y,
+                                    gint   *page,
+                                    gint   *offset)
+{
+       gint doc_x, doc_y;
+       EvRectangle *areas;
+       EvRectangle *rect;
+       guint n_areas = 0;
+       guint i;
+
+       if (!view->caret_enabled || view->rotation != 0)
+               return FALSE;
+
+       if (!view->page_cache)
+               return FALSE;
+
+       /* Get the offset from the doc point */
+       if (!get_doc_point_from_location (view, x, y, page, &doc_x, &doc_y))
+               return FALSE;
+
+       ev_page_cache_get_text_layout (view->page_cache, *page, &areas, &n_areas);
+       if (!areas)
+               return FALSE;
+
+       for (i = 0; i < n_areas; i++) {
+               rect = areas + i;
+               if (doc_x >= rect->x1 && doc_x <= rect->x2 &&
+                   doc_y >= rect->y1 && doc_y <= rect->y2) {
+                       /* Position the caret before or after the character, depending on whether
+                          the point falls within the left or right half of the bounding box. */
+                       if (doc_x <= rect->x1 + (rect->x2 - rect->x1) / 2)
+                               *offset = i;
+                       else
+                               *offset = i + 1;
+
+                       return TRUE;
+               }
+       }
+
+       return FALSE;
+}
+
+static gboolean
 ev_view_button_press_event (GtkWidget      *widget,
                            GdkEventButton *event)
 {
@@ -4087,6 +4132,8 @@ ev_view_button_press_event (GtkWidget      *widget,
                                view->image_dnd_info.start.x = event->x + view->scroll_x;
                                view->image_dnd_info.start.y = event->y + view->scroll_y;
                        } else {
+                               gint page, offset;
+
                                ev_view_remove_all (view);
 
                                if (view->synctex_result) {
@@ -4100,6 +4147,12 @@ ev_view_button_press_event (GtkWidget      *widget,
 
                                if (EV_IS_SELECTION (view->document))
                                        start_selection_for_event (view, event);
+
+                               if (get_caret_cursor_offset_at_location (view, event->x, event->y, &page, 
&offset)) {
+                                       view->cursor_offset = offset;
+                                       view->cursor_page = page;
+                                       gtk_widget_queue_draw (widget);
+                               }
                        }
                }                       
                        return TRUE;