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[evince] Split dual mode option into dual mode with odd and even pages on the left

commit d9dca4df45a988128e40fc682b44712abc9a030b
Author: Carlos Garcia Campos <carlosgc gnome org>
Date:   Sat Feb 11 16:41:18 2012 +0100

    Split dual mode option into dual mode with odd and even pages on the left
    
    https://bugzilla.gnome.org/show_bug.cgi?id=444587

 data/evince-ui.xml                   |    1 +
 data/org.gnome.Evince.gschema.xml.in |    3 +
 libview/ev-view-private.h            |    1 +
 libview/ev-view.c                    |   47 ++++++++----------
 shell/ev-window.c                    |   90 ++++++++++++++++++++++++++++------
 5 files changed, 100 insertions(+), 42 deletions(-)
---
diff --git a/data/evince-ui.xml b/data/evince-ui.xml
index 72a5af9..8bfe033 100644
--- a/data/evince-ui.xml
+++ b/data/evince-ui.xml
@@ -42,6 +42,7 @@
       <separator/>
       <menuitem name="ViewContinuousMenu" action="ViewContinuous"/>
       <menuitem name="ViewDualMenu" action="ViewDual"/>
+      <menuitem name="ViewDualOddLeftMenu" action="ViewDualOddLeft"/>
       <separator/>
       <menuitem name="ViewInvertedColors" action="ViewInvertedColors"/>
       <separator/>
diff --git a/data/org.gnome.Evince.gschema.xml.in b/data/org.gnome.Evince.gschema.xml.in
index ff194bd..93fe690 100644
--- a/data/org.gnome.Evince.gschema.xml.in
+++ b/data/org.gnome.Evince.gschema.xml.in
@@ -40,6 +40,9 @@
     <key name="dual-page" type="b">
       <default>false</default>
     </key>
+    <key name="dual-page-odd-left" type="b">
+      <default>false</default>
+    </key>
     <key name="fullscreen" type="b">
       <default>false</default>
     </key>
diff --git a/libview/ev-view-private.h b/libview/ev-view-private.h
index e46b86d..47c397c 100644
--- a/libview/ev-view-private.h
+++ b/libview/ev-view-private.h
@@ -103,6 +103,7 @@ typedef enum {
 
 typedef struct _EvHeightToPageCache {
 	gint rotation;
+	gboolean dual_even_left;
 	gdouble *height_to_page;
 	gdouble *dual_height_to_page;
 } EvHeightToPageCache;
diff --git a/libview/ev-view.c b/libview/ev-view.c
index c46addd..06017b5 100644
--- a/libview/ev-view.c
+++ b/libview/ev-view.c
@@ -125,7 +125,6 @@ static void       doc_rect_to_view_rect                      (EvView
 							      int                 page,
 							      EvRectangle        *doc_rect,
 							      GdkRectangle       *view_rect);
-static gboolean   get_dual_even_left                         (EvView             *view);
 static void       find_page_at_location                      (EvView             *view,
 							      gdouble             x,
 							      gdouble             y,
@@ -304,7 +303,7 @@ static void
 ev_view_build_height_to_page_cache (EvView		*view,
                                     EvHeightToPageCache *cache)
 {
-	gboolean swap, uniform, dual_even_left;
+	gboolean swap, uniform;
 	int i;
 	double uniform_height, page_height, next_page_height;
 	double saved_height;
@@ -316,12 +315,12 @@ ev_view_build_height_to_page_cache (EvView		*view,
 
 	uniform = ev_document_is_page_size_uniform (document);
 	n_pages = ev_document_get_n_pages (document);
-	dual_even_left = get_dual_even_left (view);
 
 	g_free (cache->height_to_page);
 	g_free (cache->dual_height_to_page);
 
 	cache->rotation = view->rotation;
+	cache->dual_even_left = view->dual_even_left;
 	cache->height_to_page = g_new0 (gdouble, n_pages + 1);
 	cache->dual_height_to_page = g_new0 (gdouble, n_pages + 2);
 
@@ -347,7 +346,7 @@ ev_view_build_height_to_page_cache (EvView		*view,
 		}
 	}
 
-	if (dual_even_left && !uniform) {
+	if (cache->dual_even_left && !uniform) {
 		gdouble w, h;
 
 		ev_document_get_page_size (document, 0, &w, &h);
@@ -356,12 +355,12 @@ ev_view_build_height_to_page_cache (EvView		*view,
 		saved_height = 0;
 	}
 
-	for (i = dual_even_left; i < n_pages + 2; i += 2) {
+	for (i = cache->dual_even_left; i < n_pages + 2; i += 2) {
     		if (uniform) {
 			uniform_height = swap ? u_width : u_height;
-			cache->dual_height_to_page[i] = ((i + dual_even_left) / 2) * uniform_height;
+			cache->dual_height_to_page[i] = ((i + cache->dual_even_left) / 2) * uniform_height;
 			if (i + 1 < n_pages + 2)
-				cache->dual_height_to_page[i + 1] = ((i + dual_even_left) / 2) * uniform_height;
+				cache->dual_height_to_page[i + 1] = ((i + cache->dual_even_left) / 2) * uniform_height;
 		} else {
 			if (i + 1 < n_pages) {
 				gdouble w, h;
@@ -441,8 +440,10 @@ ev_view_get_height_to_page (EvView *view,
 		return;
 
 	cache = view->height_to_page_cache;
-	if (cache->rotation != view->rotation)
+	if (cache->rotation != view->rotation ||
+	    cache->dual_even_left != view->dual_even_left) {
 		ev_view_build_height_to_page_cache (view, cache);
+	}
 	h = cache->height_to_page[page];
 	dh = cache->dual_height_to_page[page];
 
@@ -698,7 +699,7 @@ view_update_range_and_current_page (EvView *view)
 			}
 		}
 	} else if (view->dual_page) {
-		if (view->current_page % 2 == get_dual_even_left (view)) {
+		if (view->current_page % 2 == view->dual_even_left) {
 			view->start_page = view->current_page;
 			if (view->current_page + 1 < ev_document_get_n_pages (view->document))
 				view->end_page = view->start_page + 1;
@@ -1085,8 +1086,8 @@ get_page_y_offset (EvView *view, int page, int *y_offset)
 
 	if (view->dual_page) {
 		ev_view_get_height_to_page (view, page, NULL, &offset);
-		offset += ((page + get_dual_even_left (view)) / 2 + 1) * view->spacing +
-			((page + get_dual_even_left (view)) / 2 ) * (border.top + border.bottom);
+		offset += ((page + view->dual_even_left) / 2 + 1) * view->spacing +
+			((page + view->dual_even_left) / 2 ) * (border.top + border.bottom);
 	} else {
 		ev_view_get_height_to_page (view, page, &offset, NULL);
 		offset += (page + 1) * view->spacing + page * (border.top + border.bottom);
@@ -1123,9 +1124,9 @@ ev_view_get_page_extents (EvView       *view,
 		max_width = max_width + border->left + border->right;
 		/* Get the location of the bounding box */
 		if (view->dual_page) {
-			x = view->spacing + ((page % 2 == get_dual_even_left (view)) ? 0 : 1) * (max_width + view->spacing);
+			x = view->spacing + ((page % 2 == view->dual_even_left) ? 0 : 1) * (max_width + view->spacing);
 			x = x + MAX (0, allocation.width - (max_width * 2 + view->spacing * 3)) / 2;
-			if (page % 2 == get_dual_even_left (view))
+			if (page % 2 == view->dual_even_left)
 				x = x + (max_width - width - border->left - border->right);
 		} else {
 			x = view->spacing;
@@ -1145,7 +1146,7 @@ ev_view_get_page_extents (EvView       *view,
 			GtkBorder overall_border;
 			gint other_page;
 
-			other_page = (page % 2 == get_dual_even_left (view)) ? page + 1: page - 1;
+			other_page = (page % 2 == view->dual_even_left) ? page + 1: page - 1;
 
 			/* First, we get the bounding box of the two pages */
 			if (other_page < ev_document_get_n_pages (view->document)
@@ -1164,7 +1165,7 @@ ev_view_get_page_extents (EvView       *view,
 			y = view->spacing;
 
 			/* Adjust for being the left or right page */
-			if (page % 2 == get_dual_even_left (view))
+			if (page % 2 == view->dual_even_left)
 				x = x + max_width - width;
 			else
 				x = x + (max_width + overall_border.left + overall_border.right) + view->spacing;
@@ -1314,13 +1315,6 @@ doc_rect_to_view_rect (EvView       *view,
 	view_rect->height = h * view->scale;
 }
 
-static gboolean
-get_dual_even_left (EvView *view)
-{
-	gint n_pages = ev_document_get_n_pages (view->document);
-	return (n_pages > 2 && view->dual_even_left);
-}
-
 static void
 find_page_at_location (EvView  *view,
 		       gdouble  x,
@@ -5332,7 +5326,7 @@ ev_view_dual_page_changed_cb (EvDocumentModel *model,
 {
 	gboolean dual_page = ev_document_model_get_dual_page (model);
 
-	view->dual_page = dual_page;
+	view->dual_page = dual_page || ev_document_model_get_dual_page_odd_pages_left (model);
 	view->pending_scroll = SCROLL_TO_PAGE_POSITION;
 	/* FIXME: if we're keeping the pixbuf cache around, we should extend the
 	 * preload_cache_size to be 2 if dual_page is set.
@@ -5345,11 +5339,12 @@ ev_view_dual_odd_left_changed_cb (EvDocumentModel *model,
 				  GParamSpec      *pspec,
 				  EvView          *view)
 {
-	view->dual_even_left = !ev_document_model_get_dual_page_odd_pages_left (model);
+	gboolean dual_odd_left = ev_document_model_get_dual_page_odd_pages_left (model);
+
+	view->dual_page = dual_odd_left || ev_document_model_get_dual_page (model);
+	view->dual_even_left = !dual_odd_left;
 
 	view->pending_scroll = SCROLL_TO_PAGE_POSITION;
-	/* Total height of some page pairs may changes, recompute cache */
-	ev_view_build_height_to_page_cache(view, view->height_to_page_cache);
 	gtk_widget_queue_resize (GTK_WIDGET (view));
 }
 
diff --git a/shell/ev-window.c b/shell/ev-window.c
index e8be52e..0a658ca 100644
--- a/shell/ev-window.c
+++ b/shell/ev-window.c
@@ -471,6 +471,7 @@ ev_window_setup_action_sensitivity (EvWindow *ev_window)
 	ev_window_set_action_sensitive (ev_window, "ViewToolbar", !ev_window_is_editing_toolbar (ev_window));
 	ev_window_set_action_sensitive (ev_window, "ViewContinuous", has_pages);
 	ev_window_set_action_sensitive (ev_window, "ViewDual", has_pages);
+	ev_window_set_action_sensitive (ev_window, "ViewDualOddLeft", has_pages);
 	ev_window_set_action_sensitive (ev_window, "ViewBestFit", has_pages);
 	ev_window_set_action_sensitive (ev_window, "ViewPageWidth", has_pages);
 	ev_window_set_action_sensitive (ev_window, "ViewReload", has_pages);
@@ -1089,6 +1090,10 @@ ev_window_init_metadata_with_default_values (EvWindow *window)
 		ev_metadata_set_boolean (metadata, "dual-page",
 					 g_settings_get_boolean (settings, "dual-page"));
 	}
+	if (!ev_metadata_has_key (metadata, "dual-page-odd-left")) {
+		ev_metadata_set_boolean (metadata, "dual-page-odd-left",
+					 g_settings_get_boolean (settings, "dual-page-odd-left"));
+	}
 	if (!ev_metadata_has_key (metadata, "inverted-colors")) {
 		ev_metadata_set_boolean (metadata, "inverted-colors",
 					 g_settings_get_boolean (settings, "inverted-colors"));
@@ -1153,6 +1158,7 @@ setup_model_from_metadata (EvWindow *window)
 	gboolean inverted_colors = FALSE;
 	gboolean continuous = FALSE;
 	gboolean dual_page = FALSE;
+	gboolean dual_page_odd_left = FALSE;
 	gboolean fullscreen = FALSE;
 
 	if (!window->priv->metadata)
@@ -1215,6 +1221,11 @@ setup_model_from_metadata (EvWindow *window)
 		ev_document_model_set_dual_page (window->priv->model, dual_page);
 	}
 
+	/* Dual page odd pages left */
+	if (ev_metadata_get_boolean (window->priv->metadata, "dual-page-odd-left", &dual_page_odd_left)) {
+		ev_document_model_set_dual_page_odd_pages_left (window->priv->model, dual_page_odd_left);
+	}
+
 	/* Fullscreen */
 	if (ev_metadata_get_boolean (window->priv->metadata, "fullscreen", &fullscreen)) {
 		if (fullscreen)
@@ -1344,6 +1355,7 @@ ev_window_setup_default (EvWindow *ev_window)
 	/* Document model */
 	ev_document_model_set_continuous (model, g_settings_get_boolean (settings, "continuous"));
 	ev_document_model_set_dual_page (model, g_settings_get_boolean (settings, "dual-page"));
+	ev_document_model_set_dual_page_odd_pages_left (model, g_settings_get_boolean (settings, "dual-page-odd-left"));
 	ev_document_model_set_inverted_colors (model, g_settings_get_boolean (settings, "inverted-colors"));
 	ev_document_model_set_sizing_mode (model, g_settings_get_enum (settings, "sizing-mode"));
 	if (ev_document_model_get_sizing_mode (model) == EV_SIZING_FREE)
@@ -3767,6 +3779,17 @@ ev_window_cmd_dual (GtkAction *action, EvWindow *ev_window)
 }
 
 static void
+ev_window_cmd_dual_odd_pages_left (GtkAction *action, EvWindow *ev_window)
+{
+	gboolean dual_page_odd_left;
+
+	ev_window_stop_presentation (ev_window, TRUE);
+	dual_page_odd_left = gtk_toggle_action_get_active (GTK_TOGGLE_ACTION (action));
+	ev_document_model_set_dual_page_odd_pages_left (ev_window->priv->model,
+							dual_page_odd_left);
+}
+
+static void
 ev_window_cmd_view_best_fit (GtkAction *action, EvWindow *ev_window)
 {
 	ev_window_stop_presentation (ev_window, TRUE);
@@ -4412,6 +4435,8 @@ ev_window_cmd_edit_save_settings (GtkAction *action, EvWindow *ev_window)
 				ev_document_model_get_continuous (model));
 	g_settings_set_boolean (settings, "dual-page",
 				ev_document_model_get_dual_page (model));
+	g_settings_set_boolean (settings, "dual-page-odd-left",
+				ev_document_model_get_dual_page_odd_pages_left (model));
 	g_settings_set_boolean (settings, "fullscreen",
 				ev_document_model_get_fullscreen (model));
 	g_settings_set_boolean (settings, "inverted-colors",
@@ -4746,20 +4771,6 @@ ev_window_update_continuous_action (EvWindow *window)
 }
 
 static void
-ev_window_update_dual_page_action (EvWindow *window)
-{
-	GtkAction *action;
-
-	action = gtk_action_group_get_action (window->priv->action_group, "ViewDual");
-	g_signal_handlers_block_by_func
-		(action, G_CALLBACK (ev_window_cmd_dual), window);
-	gtk_toggle_action_set_active (GTK_TOGGLE_ACTION (action),
-				      ev_document_model_get_dual_page (window->priv->model));
-	g_signal_handlers_unblock_by_func
-		(action, G_CALLBACK (ev_window_cmd_dual), window);
-}
-
-static void
 ev_window_continuous_changed_cb (EvDocumentModel *model,
 				 GParamSpec      *pspec,
 				 EvWindow        *ev_window)
@@ -4817,6 +4828,20 @@ ev_window_inverted_colors_changed_cb (EvDocumentModel *model,
 }
 
 static void
+ev_window_update_dual_page_action (EvWindow *window)
+{
+	GtkAction *action;
+
+	action = gtk_action_group_get_action (window->priv->action_group, "ViewDual");
+	g_signal_handlers_block_by_func
+		(action, G_CALLBACK (ev_window_cmd_dual), window);
+	gtk_toggle_action_set_active (GTK_TOGGLE_ACTION (action),
+				      ev_document_model_get_dual_page (window->priv->model));
+	g_signal_handlers_unblock_by_func
+		(action, G_CALLBACK (ev_window_cmd_dual), window);
+}
+
+static void
 ev_window_dual_mode_changed_cb (EvDocumentModel *model,
 				GParamSpec      *pspec,
 				EvWindow        *ev_window)
@@ -4828,6 +4853,32 @@ ev_window_dual_mode_changed_cb (EvDocumentModel *model,
 					 ev_document_model_get_dual_page (model));
 }
 
+static void
+ev_window_update_dual_page_odd_pages_left_action (EvWindow *window)
+{
+	GtkAction *action;
+
+	action = gtk_action_group_get_action (window->priv->action_group, "ViewDualOddLeft");
+	g_signal_handlers_block_by_func
+		(action, G_CALLBACK (ev_window_cmd_dual_odd_pages_left), window);
+	gtk_toggle_action_set_active (GTK_TOGGLE_ACTION (action),
+				      ev_document_model_get_dual_page_odd_pages_left (window->priv->model));
+	g_signal_handlers_unblock_by_func
+		(action, G_CALLBACK (ev_window_cmd_dual_odd_pages_left), window);
+}
+
+static void
+ev_window_dual_mode_odd_pages_left_changed_cb (EvDocumentModel *model,
+					       GParamSpec      *pspec,
+					       EvWindow        *ev_window)
+{
+	ev_window_update_dual_page_odd_pages_left_action (ev_window);
+
+	if (ev_window->priv->metadata && !ev_window_is_empty (ev_window))
+		ev_metadata_set_boolean (ev_window->priv->metadata, "dual-page-odd-left",
+					 ev_document_model_get_dual_page_odd_pages_left (model));
+}
+
 static char *
 build_comments_string (EvDocument *document)
 {
@@ -5889,9 +5940,12 @@ static const GtkToggleActionEntry toggle_entries[] = {
         { "ViewContinuous", EV_STOCK_VIEW_CONTINUOUS, N_("_Continuous"), NULL,
 	  N_("Show the entire document"),
 	  G_CALLBACK (ev_window_cmd_continuous), TRUE },
-        { "ViewDual", EV_STOCK_VIEW_DUAL, N_("_Dual"), NULL,
-	  N_("Show two pages at once"),
+        { "ViewDual", EV_STOCK_VIEW_DUAL, N_("_Dual (Even pages left)"), NULL,
+	  N_("Show two pages at once with even pages on the left"),
 	  G_CALLBACK (ev_window_cmd_dual), FALSE },
+	{ "ViewDualOddLeft", EV_STOCK_VIEW_DUAL, N_("Dual (_Odd pages left)"), NULL,
+	  N_("Show two pages at once with odd pages on the left"),
+	  G_CALLBACK (ev_window_cmd_dual_odd_pages_left), FALSE },
         { "ViewFullscreen", GTK_STOCK_FULLSCREEN, N_("_Fullscreen"), "F11",
           N_("Expand the window to fill the screen"),
           G_CALLBACK (ev_window_cmd_view_fullscreen) },
@@ -7435,6 +7489,10 @@ ev_window_init (EvWindow *ev_window)
 			  G_CALLBACK (ev_window_dual_mode_changed_cb),
 			  ev_window);
 	g_signal_connect (ev_window->priv->model,
+			  "notify::dual-odd-left",
+			  G_CALLBACK (ev_window_dual_mode_odd_pages_left_changed_cb),
+			  ev_window);
+	g_signal_connect (ev_window->priv->model,
 			  "notify::inverted-colors",
 			  G_CALLBACK (ev_window_inverted_colors_changed_cb),
 			  ev_window);
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