Bug 438642 - EOG should have a "fit to image width" zoom mode

Add the fit-to-width plugin by Javier Sánchez. It tries to set the zoom
so that the image width fits the window.

ChangeLog

+2009-04-27  Felix Riemann  <friemann@svn.gnome.org>
+
+	* configure.ac:
+	* plugins/fit-to-width/Makefile.am:
+	* plugins/fit-to-width/eog-fit-to-width-plugin.c:
+	* plugins/fit-to-width/eog-fit-to-width-plugin.h:
+	* plugins/fit-to-width/fit-to-width.eog-plugin.desktop.in:
+	Add fit-to-width plugin which tries to make the image width fit the
+	window. Fixes bug #438642 (Javier Sánchez).
+
 2009-04-12  Felix Riemann  <friemann@svn.gnome.org>
 
 	* configure.ac:

configure.ac

@@ -58,9 +58,9 @@ EOG_HAS_PYTHON=1
 
 AC_MSG_CHECKING([which plugins to build])
 
-ALL_PLUGINS="postr champlain"
-USEFUL_PLUGINS="postr champlain"
-DEFAULT_PLUGINS="postr champlain"
+ALL_PLUGINS="postr champlain fit-to-width"
+USEFUL_PLUGINS="postr champlain fit-to-width"
+DEFAULT_PLUGINS="postr champlain fit-to-width"
 
 PYTHON_ALL_PLUGINS="slideshowshuffle pythonconsole"
 PYTHON_USEFUL_PLUGINS="slideshowshuffle pythonconsole"
@@ -327,6 +327,7 @@ AC_CONFIG_FILES([
 Makefile
 plugins/Makefile
 plugins/champlain/Makefile
+plugins/fit-to-width/Makefile
 plugins/slideshowshuffle/Makefile
 plugins/postr/Makefile
 plugins/pythonconsole/Makefile

plugins/fit-to-width/Makefile.am

+# Fit-to-width plugin
+plugindir = $(libdir)/eog/plugins
+
+INCLUDES = \
+	-I$(top_srcdir)/src 				\
+	$(EOG_CFLAGS) 					\
+	$(WARN_CFLAGS)					\
+	-DEOG_LOCALEDIR=\""$(prefix)/$(DATADIRNAME)/locale"\"
+
+plugin_LTLIBRARIES = libfit-to-width.la
+
+libfit_to_width_la_SOURCES = \
+	eog-fit-to-width-plugin.h			\
+	eog-fit-to-width-plugin.c	
+
+libfit_to_width_la_LDFLAGS = \
+	-avoid-version -module
+
+libfit_to_width_la_LIBADD = $(EOG_LIBS)
+
+# Plugin Info
+
+plugin_in_files = fit-to-width.eog-plugin.desktop.in
+
+%.eog-plugin: %.eog-plugin.desktop.in $(INTLTOOL_MERGE) $(wildcard $(top_srcdir)/po/*po) ; $(INTLTOOL_MERGE) $(top_srcdir)/po $< $@ -d -u -c $(top_builddir)/po/.intltool-merge-cache
+
+plugin_DATA = $(plugin_in_files:.eog-plugin.desktop.in=.eog-plugin)
+
+EXTRA_DIST = $(plugin_in_files)
+
+CLEANFILES = $(plugin_DATA)
+DISTCLEANFILES = $(plugin_DATA)

plugins/fit-to-width/eog-fit-to-width-plugin.c

+/* Fit-to-width -- Fit zoom to the image width
+ *
+ * Copyright (C) 2009 The Free Software Foundation
+ *
+ * Author: Javier Sánchez  <jsanchez@deskblue.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ */
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include <glib/gi18n-lib.h>
+#include <eog/eog-scroll-view.h>
+#include <eog/eog-image.h>
+
+#include "eog-fit-to-width-plugin.h"
+
+
+#define WINDOW_DATA_KEY "EogFitToWidthWindowData"
+	
+EOG_PLUGIN_REGISTER_TYPE(EogFitToWidthPlugin, eog_fit_to_width_plugin)
+
+typedef struct
+{
+	GtkActionGroup *ui_action_group;
+	guint           ui_menuitem_id;
+} WindowData;
+
+static void
+fit_to_width_cb (GtkAction *action,
+	  EogWindow *window)
+{
+	GtkWidget     *view;
+	EogImage      *image;
+	gint           image_width;
+	gint           image_height;
+	gint           view_width;
+	double         zoom;
+
+	g_return_if_fail (EOG_IS_WINDOW (window));
+	
+	view = eog_window_get_view (window);
+	image = eog_window_get_image (window);
+
+	g_return_if_fail (EOG_IS_SCROLL_VIEW (view));
+	g_return_if_fail (EOG_IS_IMAGE (image));
+	
+	eog_image_get_size (image, &image_width, &image_height);
+	view_width = view->allocation.width;
+
+	// HACK: It's necessary subtract the width size (15) of vscrollbar
+	//       to scrollview for obtain the display area.
+	zoom = (double) (view_width - 15) / image_width;
+
+	eog_scroll_view_set_zoom (EOG_SCROLL_VIEW (view), zoom);	
+}
+
+static const gchar * const ui_definition =
+	"<ui><menubar name=\"MainMenu\">"
+	"<menu action=\"View\">"
+	"<menuitem action=\"EogPluginFitToWidth\"/>"
+	"</menu></menubar></ui>";
+
+static const GtkActionEntry action_entries[] =
+{
+	{ "EogPluginFitToWidth",
+	  GTK_STOCK_ZOOM_FIT,
+	  N_("Fit to width"),
+	  NULL,
+	  N_("Zoom to fit image width"),
+	  G_CALLBACK (fit_to_width_cb) }
+};
+
+static void
+free_window_data (WindowData *data)
+{
+	g_return_if_fail (data != NULL);
+
+	g_object_unref (data->ui_action_group);
+	
+	g_free (data);
+}
+
+
+static void
+eog_fit_to_width_plugin_init (EogFitToWidthPlugin *plugin)
+{
+}
+
+static void
+eog_fit_to_width_plugin_finalize (GObject *object)
+{
+}
+
+static void
+impl_activate (EogPlugin *plugin,
+	       EogWindow *window)
+{
+	GtkUIManager *manager;
+	GList *action_groups;
+	WindowData *data;
+	
+	manager = eog_window_get_ui_manager (window);
+	action_groups = gtk_ui_manager_get_action_groups (manager);
+	data = g_new (WindowData, 1);
+
+	data->ui_action_group = gtk_action_group_new ("EogFitToWidthPluginActions");
+	
+	gtk_action_group_set_translation_domain (data->ui_action_group, 
+						 GETTEXT_PACKAGE);
+
+	gtk_action_group_add_actions (data->ui_action_group,
+				      action_entries,
+				      G_N_ELEMENTS (action_entries),
+				      window);
+
+	gtk_ui_manager_insert_action_group (manager,
+					    data->ui_action_group,
+					    -1);
+
+	data->ui_menuitem_id = gtk_ui_manager_add_ui_from_string (manager,
+								  ui_definition,
+								  -1, NULL);
+
+	g_object_set_data_full (G_OBJECT (window), 
+				WINDOW_DATA_KEY, 
+				data,
+				(GDestroyNotify) free_window_data);
+}
+
+static void
+impl_deactivate	(EogPlugin *plugin,
+		 EogWindow *window)
+{
+	GtkUIManager *manager;
+	WindowData *data;
+
+	manager = eog_window_get_ui_manager (window);
+
+	data = (WindowData *) g_object_get_data (G_OBJECT (window),
+						 WINDOW_DATA_KEY);
+	g_return_if_fail (data != NULL);
+
+	gtk_ui_manager_remove_ui (manager,
+				  data->ui_menuitem_id);
+
+	gtk_ui_manager_remove_action_group (manager,
+					    data->ui_action_group);
+
+	g_object_set_data (G_OBJECT (window),
+			   WINDOW_DATA_KEY,
+			   NULL);
+}
+
+static void
+impl_update_ui (EogPlugin *plugin,
+		EogWindow *window)
+{
+}
+
+static void
+eog_fit_to_width_plugin_class_init (EogFitToWidthPluginClass *klass)
+{
+	EogPluginClass *plugin_class = EOG_PLUGIN_CLASS (klass);
+
+	plugin_class->activate = impl_activate;
+	plugin_class->deactivate = impl_deactivate;
+	plugin_class->update_ui = impl_update_ui;
+}

plugins/fit-to-width/eog-fit-to-width-plugin.h

+/* Fit-to-width -- Fit zoom to the image width
+ *
+ * Copyright (C) 2009 The Free Software Foundation
+ *
+ * Author: Javier Sánchez  <jsanchez@deskblue.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ */
+
+#ifndef __EOG_FIT_TO_WIDTH_PLUGIN_H__
+#define __EOG_FIT_TO_WIDTH_PLUGIN_H__
+
+#include <glib.h>
+#include <glib-object.h>
+#include <eog/eog-plugin.h>
+
+G_BEGIN_DECLS
+
+/*
+ * Type checking and casting macros
+ */
+#define EOG_TYPE_FIT_TO_WIDTH_PLUGIN		(eog_fit_to_width_plugin_get_type ())
+#define EOG_FIT_TO_WIDTH_PLUGIN(o)		(G_TYPE_CHECK_INSTANCE_CAST ((o), EOG_TYPE_FIT_TO_WIDTH_PLUGIN, EogStatusbarDatePlugin))
+#define EOG_FIT_TO_WIDTH_PLUGIN_CLASS(k)	G_TYPE_CHECK_CLASS_CAST((k),      EOG_TYPE_FIT_TO_WIDTH_PLUGIN, EogStatusbarDatePluginClass))
+#define EOG_IS_FIT_TO_WIDTH_PLUGIN(o)	        (G_TYPE_CHECK_INSTANCE_TYPE ((o), EOG_TYPE_FIT_TO_WIDTH_PLUGIN))
+#define EOG_IS_FIT_TO_WIDTH_PLUGIN_CLASS(k)	(G_TYPE_CHECK_CLASS_TYPE ((k),    EOG_TYPE_FIT_TO_WIDTH_PLUGIN))
+#define EOG_FIT_TO_WIDTH_PLUGIN_GET_CLASS(o)	(G_TYPE_INSTANCE_GET_CLASS ((o),  EOG_TYPE_FIT_TO_WIDTH_PLUGIN, EogStatusbarDatePluginClass))
+
+/* Private structure type */
+typedef struct _EogFitToWidthPluginPrivate	EogFitToWidthPluginPrivate;
+
+/*
+ * Main object structure
+ */
+typedef struct _EogFitToWidthPlugin		EogFitToWidthPlugin;
+
+struct _EogFitToWidthPlugin
+{
+	EogPlugin parent_instance;
+};
+
+/*
+ * Class definition
+ */
+typedef struct _EogFitToWidthPluginClass	EogFitToWidthPluginClass;
+
+struct _EogFitToWidthPluginClass
+{
+	EogPluginClass parent_class;
+};
+
+/*
+ * Public methods
+ */
+GType	eog_fit_to_width_plugin_get_type		(void) G_GNUC_CONST;
+
+/* All the plugins must implement this function */
+G_MODULE_EXPORT GType register_eog_plugin (GTypeModule *module);
+
+G_END_DECLS
+
+#endif /* __EOG_FIT_TO_WIDTH_PLUGIN_H__ */

plugins/fit-to-width/fit-to-width.eog-plugin.desktop.in

+[Eog Plugin]
+Module=fit-to-width
+IAge=2
+_Name=Zoom to fit image width
+Icon=gtk-zoom-fit
+_Description=Zoom to fit image width
+Authors=Javier Sánchez <jsanchez@deskblue.com>
+Copyright=Copyright © 2009 Javier Sánchez 
+Website=http://www.gnome.org/projects/eog

po/ChangeLog

+2009-04-27  Felix Riemann  <friemann@svn.gnome.org>
+
+	* POTFILES.in: Add entries for fit-to-width plugin.
+
 2009-04-20  Daniel Nylander <po@danielnylander.se>
 
 	* sv.po: Updated Swedish translation.

po/POTFILES.in

 plugins/champlain/champlain.eog-plugin.desktop.in
+plugins/fit-to-width/eog-fit-to-width-plugin.c
+plugins/fit-to-width/fit-to-width.eog-plugin.desktop.in
 plugins/slideshowshuffle/slideshowshuffle.eog-plugin.desktop.in
 plugins/postr/postr.eog-plugin.desktop.in
 plugins/postr/eog-postr-plugin.c