libview: Rework ev_view_accessible_get_selection

Actually return the text and offset range of the selected text in the
current page.

https://bugzilla.gnome.org/show_bug.cgi?id=704335

origin commit:
https://git.gnome.org/browse/evince/commit/?h=gnome-3-10&id=a178d26

3 files changed, 105 insertions, 19 deletions

diff --git a/libview/ev-view-accessible.c b/libview/ev-view-accessible.c
index 81fcc797..7e62f70d 100644
--- a/libview/ev-view-accessible.c
+++ b/libview/ev-view-accessible.c
@@ -626,6 +626,42 @@ ev_view_accessible_get_n_selections (AtkText *text)
 	return 1;
 }
 
+static gboolean
+get_selection_bounds (EvView          *view,
+                      EvViewSelection *selection,
+                      gint            *start_offset,
+                      gint            *end_offset)
+{
+	cairo_rectangle_int_t rect;
+	gint start, end;
+
+	if (!selection->covered_region || cairo_region_is_empty (selection->covered_region))
+		return FALSE;
+
+	cairo_region_get_rectangle (selection->covered_region, 0, &rect);
+	start = _ev_view_get_caret_cursor_offset_at_doc_point (view,
+	                                                       selection->page,
+	                                                       rect.x / view->scale,
+	                                                       (rect.y + (rect.height / 2)) / view->scale);
+	if (start == -1)
+		return FALSE;
+
+	cairo_region_get_rectangle (selection->covered_region,
+				    cairo_region_num_rectangles (selection->covered_region) - 1,
+				    &rect);
+	end = _ev_view_get_caret_cursor_offset_at_doc_point (view,
+	                                                     selection->page,
+	                                                     (rect.x + rect.width) / view->scale,
+	                                                     (rect.y + (rect.height / 2)) / view->scale);
+	if (end == -1)
+		return FALSE;
+
+	*start_offset = start;
+	*end_offset = end;
+
+	return TRUE;
+}
+
 static gchar *
 ev_view_accessible_get_selection (AtkText *text,
 				  gint     selection_num,
@@ -633,9 +669,13 @@ ev_view_accessible_get_selection (AtkText *text,
 				  gint    *end_pos)
 {
 	GtkWidget *widget;
-	GtkTextBuffer *buffer;
-	GtkTextIter start, end;
-	gchar *retval = NULL;
+	EvView    *view;
+	gchar *selected_text = NULL;
+	gchar *normalized_text = NULL;
+	GList *l;
+
+	*start_pos = -1;
+	*end_pos = -1;
 
 	widget = gtk_accessible_get_widget (GTK_ACCESSIBLE (text));
 	if (widget == NULL)
@@ -645,18 +685,46 @@ ev_view_accessible_get_selection (AtkText *text,
 	if (selection_num != 0)
 		return NULL;
 
-	buffer = ev_view_accessible_get_text_buffer (EV_VIEW_ACCESSIBLE (text), EV_VIEW (widget));
-	if (!buffer)
+	view = EV_VIEW (widget);
+	if (!EV_IS_SELECTION (view->document) || !view->selection_info.selections)
 		return NULL;
 
-	gtk_text_buffer_get_selection_bounds (buffer, &start, &end);
-	*start_pos = gtk_text_iter_get_offset (&start);
-	*end_pos = gtk_text_iter_get_offset (&end);
 
-	if (*start_pos != *end_pos)
-		retval = gtk_text_buffer_get_text (buffer, &start, &end, FALSE);
+	for (l = view->selection_info.selections; l != NULL; l = l->next) {
+		EvViewSelection *selection = (EvViewSelection *)l->data;
+		gint start, end;
 
-	return retval;
+		if (selection->page != view->current_page)
+			continue;
+
+		if (get_selection_bounds (view, selection, &start, &end) && start != end) {
+			EvPage *page;
+
+			page = ev_document_get_page (view->document, selection->page);
+
+			ev_document_doc_mutex_lock ();
+			selected_text = ev_selection_get_selected_text (EV_SELECTION (view->document),
+			                                                page,
+			                                                selection->style,
+			                                                &(selection->rect));
+
+			ev_document_doc_mutex_unlock ();
+
+			g_object_unref (page);
+
+			*start_pos = start;
+			*end_pos = end;
+		}
+
+		break;
+	}
+
+	if (selected_text) {
+		normalized_text = g_utf8_normalize (selected_text, -1, G_NORMALIZE_NFKC);
+		g_free (selected_text);
+	}
+
+	return normalized_text;
 }
 
 static gboolean
diff --git a/libview/ev-view-private.h b/libview/ev-view-private.h
index dfe777ff..178733a7 100644
--- a/libview/ev-view-private.h
+++ b/libview/ev-view-private.h
@@ -288,7 +288,10 @@ void _ev_view_transform_doc_rect_to_view_rect (EvView       *view,
 void _ev_view_get_selection_colors (EvView  *view,
                                     GdkRGBA *bg_color,
                                     GdkRGBA *fg_color);
-
+gint _ev_view_get_caret_cursor_offset_at_doc_point (EvView *view,
+                                                    gint    page,
+                                                    gdouble doc_x,
+                                                    gdouble doc_y);
 void _ev_view_set_focused_element (EvView *view,
                                    EvMapping *element_mapping,
                                    gint page);
diff --git a/libview/ev-view.c b/libview/ev-view.c
index 9a81ce46..2e277cff 100644
--- a/libview/ev-view.c
+++ b/libview/ev-view.c
@@ -4233,11 +4233,11 @@ start_selection_for_event (EvView         *view,
 			    &(view->selection_info.start));
 }
 
-static gboolean
-position_caret_cursor_at_doc_point (EvView *view,
-                                    gint    page,
-                                    gdouble doc_x,
-                                    gdouble doc_y)
+gint
+_ev_view_get_caret_cursor_offset_at_doc_point (EvView *view,
+                                               gint    page,
+                                               gdouble doc_x,
+                                               gdouble doc_y)
 {
 	EvRectangle *areas = NULL;
 	guint        n_areas = 0;
@@ -4249,7 +4249,7 @@ position_caret_cursor_at_doc_point (EvView *view,
 
 	ev_page_cache_get_text_layout (view->page_cache, page, &areas, &n_areas);
 	if (!areas)
-		return FALSE;
+		return -1;
 
 	i = 0;
 	while (i < n_areas && offset == -1) {
@@ -4305,11 +4305,26 @@ position_caret_cursor_at_doc_point (EvView *view,
 	}
 
 	if (last_line_offset == -1)
-		return FALSE;
+		return -1;
 
 	if (offset == -1)
 		offset = last_line_offset;
 
+	return offset;
+}
+
+static gboolean
+position_caret_cursor_at_doc_point (EvView *view,
+                                    gint    page,
+                                    gdouble doc_x,
+                                    gdouble doc_y)
+{
+	gint offset;
+
+	offset = _ev_view_get_caret_cursor_offset_at_doc_point (view, page, doc_x, doc_y);
+	if (offset == -1)
+		return FALSE;
+
 	if (view->cursor_offset != offset || view->cursor_page != page) {
 		view->cursor_offset = offset;
 		view->cursor_page = page;