glib/demo/layers.c - third_party/poppler - Git at Google

 /*
  * Copyright (C) 2008 Carlos Garcia Campos  <carlosgc@gnome.org>
  *
  * 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, 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., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA.
  */

 #include "config.h"

 #include <gtk/gtk.h>

 #include "layers.h"

 enum {
 	LAYERS_TITLE_COLUMN,
 	LAYERS_VISIBILITY_COLUMN,
 	LAYERS_ENABLE_COLUMN,
 	LAYERS_SHOWTOGGLE_COLUMN,
 	LAYERS_RB_GROUP_COLUMN,
 	LAYERS_LAYER_COLUMN,
 	N_COLUMNS
 };

 typedef struct {
 	PopplerDocument *doc;
 	guint            page;
 	GtkWidget       *treeview;
 	GtkWidget       *darea;

 	cairo_surface_t *surface;
 } PgdLayersDemo;

 static void
 pgd_layers_free (PgdLayersDemo *demo)
 {
 	if (!demo)
 		return;

 	if (demo->doc) {
 		g_object_unref (demo->doc);
 		demo->doc = NULL;
 	}

 	if (demo->surface) {
 		cairo_surface_destroy (demo->surface);
 		demo->surface = NULL;
 	}

 	g_free (demo);
 }

 static void
 build_tree (PopplerDocument   *document,
 	    GtkTreeModel      *model,
 	    GtkTreeIter       *parent,
 	    PopplerLayersIter *iter)
 {

 	do {
 		GtkTreeIter        tree_iter;
 		PopplerLayersIter *child;
 		PopplerLayer      *layer;
 		gboolean           visible;
 		gchar             *markup;
 		gint               rb_group = 0;

 		layer = poppler_layers_iter_get_layer (iter);
 		if (layer) {
 			markup = g_markup_escape_text (poppler_layer_get_title (layer), -1);
 			visible = poppler_layer_is_visible (layer);
 			rb_group = poppler_layer_get_radio_button_group_id (layer);
 		} else {
 			gchar *title;

 			title = poppler_layers_iter_get_title (iter);
 			markup = g_markup_escape_text (title, -1);
 			g_free (title);

 			visible = FALSE;
 			layer = NULL;
 		}

 		gtk_tree_store_append (GTK_TREE_STORE (model), &tree_iter, parent);
 		gtk_tree_store_set (GTK_TREE_STORE (model), &tree_iter,
 				    LAYERS_TITLE_COLUMN, markup,
 				    LAYERS_VISIBILITY_COLUMN, visible,
 				    LAYERS_ENABLE_COLUMN, TRUE, /* FIXME */
 				    LAYERS_SHOWTOGGLE_COLUMN, (layer != NULL),
 				    LAYERS_RB_GROUP_COLUMN, rb_group,
 				    LAYERS_LAYER_COLUMN, layer,
 				    -1);
 		if (layer)
 			g_object_unref (layer);
 		g_free (markup);

 		child = poppler_layers_iter_get_child (iter);
 		if (child)
 			build_tree (document, model, &tree_iter, child);
 		poppler_layers_iter_free (child);
 	} while (poppler_layers_iter_next (iter));
 }

 GtkTreeModel *
 pgd_layers_create_model (PopplerDocument *document)
 {
 	GtkTreeModel     *model;
 	PopplerLayersIter *iter;

 	iter = poppler_layers_iter_new (document);
 	if (iter) {
 		model = GTK_TREE_MODEL (
 			gtk_tree_store_new (N_COLUMNS,
 					    G_TYPE_STRING,
 					    G_TYPE_BOOLEAN,
 					    G_TYPE_BOOLEAN,
 					    G_TYPE_BOOLEAN,
 					    G_TYPE_INT,
 					    G_TYPE_OBJECT));
 		build_tree (document, model, NULL, iter);
 		poppler_layers_iter_free (iter);
 	} else {
 		GtkTreeIter tree_iter;
 		gchar      *markup;

 		model = GTK_TREE_MODEL (gtk_list_store_new (1, G_TYPE_STRING));
 		gtk_list_store_append (GTK_LIST_STORE (model), &tree_iter);
 		markup = g_strdup_printf ("<span size=\"larger\" style=\"italic\">%s</span>",
 					  "The document doesn't contain layers");
 		gtk_list_store_set (GTK_LIST_STORE (model), &tree_iter,
 				    0, markup, -1);
 		g_free (markup);
 	}

 	return model;
 }

 static cairo_surface_t *
 pgd_layers_render_page (PgdLayersDemo *demo)
 {
 	cairo_t *cr;
 	PopplerPage *page;
 	gdouble width, height;
 	cairo_surface_t *surface = NULL;

 	page = poppler_document_get_page (demo->doc, demo->page);
 	if (!page)
 		return NULL;

 	poppler_page_get_size (page, &width, &height);
 	gtk_widget_set_size_request (demo->darea, width, height);

 	surface = cairo_image_surface_create (CAIRO_FORMAT_RGB24,
 					      width, height);
 	cr = cairo_create (surface);

 	cairo_save (cr);
 	cairo_set_source_rgb (cr, 1, 1, 1);
 	cairo_rectangle (cr, 0, 0, width, height);
 	cairo_fill (cr);
 	cairo_restore (cr);

 	cairo_save (cr);
 	poppler_page_render (page, cr);
 	cairo_restore (cr);

 	cairo_destroy (cr);
 	g_object_unref (page);

 	return surface;
 }

 static gboolean
 pgd_layers_viewer_drawing_area_draw (GtkWidget     *area,
                                      cairo_t       *cr,
                                      PgdLayersDemo *demo)
 {
 	if (!demo->surface) {
 		demo->surface = pgd_layers_render_page (demo);
 		if (!demo->surface)
 			return FALSE;
 	}

 	cairo_set_source_surface (cr, demo->surface, 0, 0);
 	cairo_paint (cr);

 	return TRUE;
 }

 static gboolean
 pgd_layers_viewer_redraw (PgdLayersDemo *demo)
 {
 	cairo_surface_destroy (demo->surface);
 	demo->surface = NULL;

 	gtk_widget_queue_draw (demo->darea);

 	return FALSE;
 }

 static void
 pgd_layers_viewer_queue_redraw (PgdLayersDemo *demo)
 {
 	g_idle_add ((GSourceFunc)pgd_layers_viewer_redraw, demo);
 }

 static void
 pgd_layers_page_selector_value_changed (GtkSpinButton *spinbutton,
 					PgdLayersDemo *demo)
 {
 	demo->page = (gint)gtk_spin_button_get_value (spinbutton) - 1;
 	pgd_layers_viewer_queue_redraw (demo);
 }

 static GtkWidget *
 pgd_layers_create_viewer (PgdLayersDemo *demo)
 {
 	GtkWidget *vbox, *hbox;
 	GtkWidget *label;
 	GtkWidget *swindow;
 	GtkWidget *page_selector;
 	guint      n_pages;
 	gchar     *str;

 	vbox = gtk_box_new (GTK_ORIENTATION_VERTICAL, 6);

 	hbox = gtk_box_new (GTK_ORIENTATION_HORIZONTAL, 6);

 	label = gtk_label_new ("Page:");
 	gtk_box_pack_start (GTK_BOX (hbox), label, FALSE, TRUE, 0);
 	gtk_widget_show (label);

 	n_pages = poppler_document_get_n_pages (demo->doc);
 	page_selector = gtk_spin_button_new_with_range (1, n_pages, 1);
 	g_signal_connect (G_OBJECT (page_selector), "value-changed",
 			  G_CALLBACK (pgd_layers_page_selector_value_changed),
 			  (gpointer)demo);
 	gtk_box_pack_start (GTK_BOX (hbox), page_selector, FALSE, TRUE, 0);
 	gtk_widget_show (page_selector);

 	str = g_strdup_printf ("of %d", n_pages);
 	label = gtk_label_new (str);
 	gtk_box_pack_start (GTK_BOX (hbox), label, FALSE, TRUE, 0);
 	gtk_widget_show (label);
 	g_free (str);

 	gtk_box_pack_start (GTK_BOX (vbox), hbox, FALSE, TRUE, 0);
 	gtk_widget_show (hbox);

 	demo->darea = gtk_drawing_area_new ();
 	g_signal_connect (G_OBJECT (demo->darea), "draw",
 			  G_CALLBACK (pgd_layers_viewer_drawing_area_draw),
 			  (gpointer)demo);

 	swindow = gtk_scrolled_window_new (NULL, NULL);
 	gtk_scrolled_window_set_policy (GTK_SCROLLED_WINDOW (swindow),
 					GTK_POLICY_AUTOMATIC, GTK_POLICY_AUTOMATIC);
 #if GTK_CHECK_VERSION(3, 7, 8)
 	gtk_container_add(GTK_CONTAINER(swindow), demo->darea);
 #else
 	gtk_scrolled_window_add_with_viewport (GTK_SCROLLED_WINDOW (swindow), demo->darea);
 #endif
 	gtk_widget_show (demo->darea);

 	gtk_box_pack_start (GTK_BOX (vbox), swindow, TRUE, TRUE, 0);
 	gtk_widget_show (swindow);

 	return vbox;
 }

 static gboolean
 update_kids (GtkTreeModel *model,
 	     GtkTreePath  *path,
 	     GtkTreeIter  *iter,
 	     GtkTreeIter  *parent)
 {
 	if (gtk_tree_store_is_ancestor (GTK_TREE_STORE (model), parent, iter)) {
 		gboolean visible;

 		gtk_tree_model_get (model, parent,
 				    LAYERS_VISIBILITY_COLUMN, &visible,
 				    -1);
 		gtk_tree_store_set (GTK_TREE_STORE (model), iter,
 				    LAYERS_ENABLE_COLUMN, visible,
 				    -1);
 	}

 	return FALSE;
 }

 static gboolean
 clear_rb_group (GtkTreeModel *model,
 		GtkTreePath  *path,
 		GtkTreeIter  *iter,
 		gint         *rb_group)
 {
 	gint group;

 	gtk_tree_model_get (model, iter,
 			    LAYERS_RB_GROUP_COLUMN, &group,
 			    -1);

 	if (group == *rb_group) {
 		gtk_tree_store_set (GTK_TREE_STORE (model), iter,
 				    LAYERS_VISIBILITY_COLUMN, FALSE,
 				    -1);
 	}

 	return FALSE;
 }

 static void
 pgd_layers_visibility_changed (GtkCellRendererToggle *cell,
 			       gchar                 *path_str,
 			       PgdLayersDemo         *demo)
 {
 	GtkTreeModel *model;
 	GtkTreePath *path;
 	GtkTreeIter iter;
 	gboolean visible;
 	PopplerLayer *layer;

 	model = gtk_tree_view_get_model (GTK_TREE_VIEW (demo->treeview));

 	path = gtk_tree_path_new_from_string (path_str);
 	gtk_tree_model_get_iter (model, &iter, path);
 	gtk_tree_model_get (model, &iter,
 			    LAYERS_VISIBILITY_COLUMN, &visible,
 			    LAYERS_LAYER_COLUMN, &layer,
 			    -1);

 	visible = !visible;
 	visible ? poppler_layer_show (layer) : poppler_layer_hide (layer);

 	if (visible) {
 		gint rb_group;

 		rb_group = poppler_layer_get_radio_button_group_id (layer);
 		if (rb_group) {
 			gtk_tree_model_foreach (model,
 						(GtkTreeModelForeachFunc)clear_rb_group,
 						&rb_group);
 		}
 	}

 	gtk_tree_store_set (GTK_TREE_STORE (model), &iter,
 			    LAYERS_VISIBILITY_COLUMN, visible,
 			    -1);

 	if (poppler_layer_is_parent (layer)) {
 		gtk_tree_model_foreach (model,
 					(GtkTreeModelForeachFunc)update_kids,
 					&iter);
 	}

 	pgd_layers_viewer_queue_redraw (demo);

 	gtk_tree_path_free (path);
 	g_object_unref (layer);
 }

 GtkWidget *
 pgd_layers_create_widget (PopplerDocument *document)
 {
 	PgdLayersDemo    *demo;
 	GtkWidget        *swindow;
 	GtkWidget        *treeview;
 	GtkTreeModel     *model;
 	GtkCellRenderer  *renderer;
 	GtkWidget        *hpaned, *viewer;

 	demo = g_new0 (PgdLayersDemo, 1);
 	demo->doc = g_object_ref (document);

 	hpaned = gtk_paned_new (GTK_ORIENTATION_HORIZONTAL);

 	viewer = pgd_layers_create_viewer (demo);

 	swindow = gtk_scrolled_window_new (NULL, NULL);
 	gtk_scrolled_window_set_policy (GTK_SCROLLED_WINDOW (swindow),
 					GTK_POLICY_AUTOMATIC,
 					GTK_POLICY_AUTOMATIC);

 	model = pgd_layers_create_model (document);
 	treeview = gtk_tree_view_new_with_model (model);
 	demo->treeview = treeview;
 	g_object_unref (model);

 	renderer = gtk_cell_renderer_text_new ();
 	gtk_tree_view_insert_column_with_attributes (GTK_TREE_VIEW (treeview),
 						     0, "Layer",
 						     renderer,
 						     "markup", LAYERS_TITLE_COLUMN,
 						     NULL);
 	g_object_set (G_OBJECT (renderer), "ellipsize", PANGO_ELLIPSIZE_END, NULL);
 	g_object_set (G_OBJECT (gtk_tree_view_get_column (GTK_TREE_VIEW (treeview), 0)),
 		      "expand", TRUE, NULL);

 	if (GTK_IS_TREE_STORE (model)) {
 		renderer = gtk_cell_renderer_toggle_new ();
 		gtk_tree_view_insert_column_with_attributes (GTK_TREE_VIEW (treeview),
 							     1, "Show/Hide",
 							     renderer,
 							     "active", LAYERS_VISIBILITY_COLUMN,
 							     "activatable", LAYERS_ENABLE_COLUMN,
 							     "visible", LAYERS_SHOWTOGGLE_COLUMN,
 							     NULL);

 		g_signal_connect (renderer, "toggled",
 				  G_CALLBACK (pgd_layers_visibility_changed),
 				  (gpointer)demo);
 		gtk_tree_view_column_set_clickable (gtk_tree_view_get_column (GTK_TREE_VIEW (treeview), 1),
 						    TRUE);
 	}

 	gtk_tree_selection_set_mode (gtk_tree_view_get_selection (GTK_TREE_VIEW (treeview)),
 				     GTK_SELECTION_NONE);

 	gtk_container_add (GTK_CONTAINER (swindow), treeview);
 	gtk_widget_show (treeview);

 	gtk_paned_add1 (GTK_PANED (hpaned), swindow);
 	gtk_widget_show (swindow);

 	gtk_paned_add2 (GTK_PANED (hpaned), viewer);
 	gtk_widget_show (viewer);

 	gtk_paned_set_position (GTK_PANED (hpaned), 150);

 	g_object_weak_ref (G_OBJECT (hpaned),
 			   (GWeakNotify)pgd_layers_free,
 			   (gpointer)demo);

 	return hpaned;
 }
	/*
	* Copyright (C) 2008 Carlos Garcia Campos <carlosgc@gnome.org>
	*
	* 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, 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., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA.
	*/

	#include "config.h"

	#include <gtk/gtk.h>

	#include "layers.h"

	enum {
	LAYERS_TITLE_COLUMN,
	LAYERS_VISIBILITY_COLUMN,
	LAYERS_ENABLE_COLUMN,
	LAYERS_SHOWTOGGLE_COLUMN,
	LAYERS_RB_GROUP_COLUMN,
	LAYERS_LAYER_COLUMN,
	N_COLUMNS
	};

	typedef struct {
	PopplerDocument *doc;
	guint page;
	GtkWidget *treeview;
	GtkWidget *darea;

	cairo_surface_t *surface;
	} PgdLayersDemo;

	static void
	pgd_layers_free (PgdLayersDemo *demo)
	{
	if (!demo)
	return;

	if (demo->doc) {
	g_object_unref (demo->doc);
	demo->doc = NULL;
	}

	if (demo->surface) {
	cairo_surface_destroy (demo->surface);
	demo->surface = NULL;
	}

	g_free (demo);
	}

	static void
	build_tree (PopplerDocument *document,
	GtkTreeModel *model,
	GtkTreeIter *parent,
	PopplerLayersIter *iter)
	{

	do {
	GtkTreeIter tree_iter;
	PopplerLayersIter *child;
	PopplerLayer *layer;
	gboolean visible;
	gchar *markup;
	gint rb_group = 0;

	layer = poppler_layers_iter_get_layer (iter);
	if (layer) {
	markup = g_markup_escape_text (poppler_layer_get_title (layer), -1);
	visible = poppler_layer_is_visible (layer);
	rb_group = poppler_layer_get_radio_button_group_id (layer);
	} else {
	gchar *title;

	title = poppler_layers_iter_get_title (iter);
	markup = g_markup_escape_text (title, -1);
	g_free (title);

	visible = FALSE;
	layer = NULL;
	}

	gtk_tree_store_append (GTK_TREE_STORE (model), &tree_iter, parent);
	gtk_tree_store_set (GTK_TREE_STORE (model), &tree_iter,
	LAYERS_TITLE_COLUMN, markup,
	LAYERS_VISIBILITY_COLUMN, visible,
	LAYERS_ENABLE_COLUMN, TRUE, /* FIXME */
	LAYERS_SHOWTOGGLE_COLUMN, (layer != NULL),
	LAYERS_RB_GROUP_COLUMN, rb_group,
	LAYERS_LAYER_COLUMN, layer,
	-1);
	if (layer)
	g_object_unref (layer);
	g_free (markup);

	child = poppler_layers_iter_get_child (iter);
	if (child)
	build_tree (document, model, &tree_iter, child);
	poppler_layers_iter_free (child);
	} while (poppler_layers_iter_next (iter));
	}

	GtkTreeModel *
	pgd_layers_create_model (PopplerDocument *document)
	{
	GtkTreeModel *model;
	PopplerLayersIter *iter;

	iter = poppler_layers_iter_new (document);
	if (iter) {
	model = GTK_TREE_MODEL (
	gtk_tree_store_new (N_COLUMNS,
	G_TYPE_STRING,
	G_TYPE_BOOLEAN,
	G_TYPE_BOOLEAN,
	G_TYPE_BOOLEAN,
	G_TYPE_INT,
	G_TYPE_OBJECT));
	build_tree (document, model, NULL, iter);
	poppler_layers_iter_free (iter);
	} else {
	GtkTreeIter tree_iter;
	gchar *markup;

	model = GTK_TREE_MODEL (gtk_list_store_new (1, G_TYPE_STRING));
	gtk_list_store_append (GTK_LIST_STORE (model), &tree_iter);
	markup = g_strdup_printf ("<span size=\"larger\" style=\"italic\">%s</span>",
	"The document doesn't contain layers");
	gtk_list_store_set (GTK_LIST_STORE (model), &tree_iter,
	0, markup, -1);
	g_free (markup);
	}

	return model;
	}

	static cairo_surface_t *
	pgd_layers_render_page (PgdLayersDemo *demo)
	{
	cairo_t *cr;
	PopplerPage *page;
	gdouble width, height;
	cairo_surface_t *surface = NULL;

	page = poppler_document_get_page (demo->doc, demo->page);
	if (!page)
	return NULL;

	poppler_page_get_size (page, &width, &height);
	gtk_widget_set_size_request (demo->darea, width, height);

	surface = cairo_image_surface_create (CAIRO_FORMAT_RGB24,
	width, height);
	cr = cairo_create (surface);

	cairo_save (cr);
	cairo_set_source_rgb (cr, 1, 1, 1);
	cairo_rectangle (cr, 0, 0, width, height);
	cairo_fill (cr);
	cairo_restore (cr);

	cairo_save (cr);
	poppler_page_render (page, cr);
	cairo_restore (cr);

	cairo_destroy (cr);
	g_object_unref (page);

	return surface;
	}

	static gboolean
	pgd_layers_viewer_drawing_area_draw (GtkWidget *area,
	cairo_t *cr,
	PgdLayersDemo *demo)
	{
	if (!demo->surface) {
	demo->surface = pgd_layers_render_page (demo);
	if (!demo->surface)
	return FALSE;
	}

	cairo_set_source_surface (cr, demo->surface, 0, 0);
	cairo_paint (cr);

	return TRUE;
	}

	static gboolean
	pgd_layers_viewer_redraw (PgdLayersDemo *demo)
	{
	cairo_surface_destroy (demo->surface);
	demo->surface = NULL;

	gtk_widget_queue_draw (demo->darea);

	return FALSE;
	}

	static void
	pgd_layers_viewer_queue_redraw (PgdLayersDemo *demo)
	{
	g_idle_add ((GSourceFunc)pgd_layers_viewer_redraw, demo);
	}

	static void
	pgd_layers_page_selector_value_changed (GtkSpinButton *spinbutton,
	PgdLayersDemo *demo)
	{
	demo->page = (gint)gtk_spin_button_get_value (spinbutton) - 1;
	pgd_layers_viewer_queue_redraw (demo);
	}

	static GtkWidget *
	pgd_layers_create_viewer (PgdLayersDemo *demo)
	{
	GtkWidget vbox, hbox;
	GtkWidget *label;
	GtkWidget *swindow;
	GtkWidget *page_selector;
	guint n_pages;
	gchar *str;

	vbox = gtk_box_new (GTK_ORIENTATION_VERTICAL, 6);

	hbox = gtk_box_new (GTK_ORIENTATION_HORIZONTAL, 6);

	label = gtk_label_new ("Page:");
	gtk_box_pack_start (GTK_BOX (hbox), label, FALSE, TRUE, 0);
	gtk_widget_show (label);

	n_pages = poppler_document_get_n_pages (demo->doc);
	page_selector = gtk_spin_button_new_with_range (1, n_pages, 1);
	g_signal_connect (G_OBJECT (page_selector), "value-changed",
	G_CALLBACK (pgd_layers_page_selector_value_changed),
	(gpointer)demo);
	gtk_box_pack_start (GTK_BOX (hbox), page_selector, FALSE, TRUE, 0);
	gtk_widget_show (page_selector);

	str = g_strdup_printf ("of %d", n_pages);
	label = gtk_label_new (str);
	gtk_box_pack_start (GTK_BOX (hbox), label, FALSE, TRUE, 0);
	gtk_widget_show (label);
	g_free (str);

	gtk_box_pack_start (GTK_BOX (vbox), hbox, FALSE, TRUE, 0);
	gtk_widget_show (hbox);

	demo->darea = gtk_drawing_area_new ();
	g_signal_connect (G_OBJECT (demo->darea), "draw",
	G_CALLBACK (pgd_layers_viewer_drawing_area_draw),
	(gpointer)demo);

	swindow = gtk_scrolled_window_new (NULL, NULL);
	gtk_scrolled_window_set_policy (GTK_SCROLLED_WINDOW (swindow),
	GTK_POLICY_AUTOMATIC, GTK_POLICY_AUTOMATIC);
	#if GTK_CHECK_VERSION(3, 7, 8)
	gtk_container_add(GTK_CONTAINER(swindow), demo->darea);
	#else
	gtk_scrolled_window_add_with_viewport (GTK_SCROLLED_WINDOW (swindow), demo->darea);
	#endif
	gtk_widget_show (demo->darea);

	gtk_box_pack_start (GTK_BOX (vbox), swindow, TRUE, TRUE, 0);
	gtk_widget_show (swindow);

	return vbox;
	}

	static gboolean
	update_kids (GtkTreeModel *model,
	GtkTreePath *path,
	GtkTreeIter *iter,
	GtkTreeIter *parent)
	{
	if (gtk_tree_store_is_ancestor (GTK_TREE_STORE (model), parent, iter)) {
	gboolean visible;

	gtk_tree_model_get (model, parent,
	LAYERS_VISIBILITY_COLUMN, &visible,
	-1);
	gtk_tree_store_set (GTK_TREE_STORE (model), iter,
	LAYERS_ENABLE_COLUMN, visible,
	-1);
	}

	return FALSE;
	}

	static gboolean
	clear_rb_group (GtkTreeModel *model,
	GtkTreePath *path,
	GtkTreeIter *iter,
	gint *rb_group)
	{
	gint group;

	gtk_tree_model_get (model, iter,
	LAYERS_RB_GROUP_COLUMN, &group,
	-1);

	if (group == *rb_group) {
	gtk_tree_store_set (GTK_TREE_STORE (model), iter,
	LAYERS_VISIBILITY_COLUMN, FALSE,
	-1);
	}

	return FALSE;
	}

	static void
	pgd_layers_visibility_changed (GtkCellRendererToggle *cell,
	gchar *path_str,
	PgdLayersDemo *demo)
	{
	GtkTreeModel *model;
	GtkTreePath *path;
	GtkTreeIter iter;
	gboolean visible;
	PopplerLayer *layer;

	model = gtk_tree_view_get_model (GTK_TREE_VIEW (demo->treeview));

	path = gtk_tree_path_new_from_string (path_str);
	gtk_tree_model_get_iter (model, &iter, path);
	gtk_tree_model_get (model, &iter,
	LAYERS_VISIBILITY_COLUMN, &visible,
	LAYERS_LAYER_COLUMN, &layer,
	-1);

	visible = !visible;
	visible ? poppler_layer_show (layer) : poppler_layer_hide (layer);

	if (visible) {
	gint rb_group;

	rb_group = poppler_layer_get_radio_button_group_id (layer);
	if (rb_group) {
	gtk_tree_model_foreach (model,
	(GtkTreeModelForeachFunc)clear_rb_group,
	&rb_group);
	}
	}

	gtk_tree_store_set (GTK_TREE_STORE (model), &iter,
	LAYERS_VISIBILITY_COLUMN, visible,
	-1);

	if (poppler_layer_is_parent (layer)) {
	gtk_tree_model_foreach (model,
	(GtkTreeModelForeachFunc)update_kids,
	&iter);
	}

	pgd_layers_viewer_queue_redraw (demo);

	gtk_tree_path_free (path);
	g_object_unref (layer);
	}

	GtkWidget *
	pgd_layers_create_widget (PopplerDocument *document)
	{
	PgdLayersDemo *demo;
	GtkWidget *swindow;
	GtkWidget *treeview;
	GtkTreeModel *model;
	GtkCellRenderer *renderer;
	GtkWidget hpaned, viewer;

	demo = g_new0 (PgdLayersDemo, 1);
	demo->doc = g_object_ref (document);

	hpaned = gtk_paned_new (GTK_ORIENTATION_HORIZONTAL);

	viewer = pgd_layers_create_viewer (demo);

	swindow = gtk_scrolled_window_new (NULL, NULL);
	gtk_scrolled_window_set_policy (GTK_SCROLLED_WINDOW (swindow),
	GTK_POLICY_AUTOMATIC,
	GTK_POLICY_AUTOMATIC);

	model = pgd_layers_create_model (document);
	treeview = gtk_tree_view_new_with_model (model);
	demo->treeview = treeview;
	g_object_unref (model);

	renderer = gtk_cell_renderer_text_new ();
	gtk_tree_view_insert_column_with_attributes (GTK_TREE_VIEW (treeview),
	0, "Layer",
	renderer,
	"markup", LAYERS_TITLE_COLUMN,
	NULL);
	g_object_set (G_OBJECT (renderer), "ellipsize", PANGO_ELLIPSIZE_END, NULL);
	g_object_set (G_OBJECT (gtk_tree_view_get_column (GTK_TREE_VIEW (treeview), 0)),
	"expand", TRUE, NULL);

	if (GTK_IS_TREE_STORE (model)) {
	renderer = gtk_cell_renderer_toggle_new ();
	gtk_tree_view_insert_column_with_attributes (GTK_TREE_VIEW (treeview),
	1, "Show/Hide",
	renderer,
	"active", LAYERS_VISIBILITY_COLUMN,
	"activatable", LAYERS_ENABLE_COLUMN,
	"visible", LAYERS_SHOWTOGGLE_COLUMN,
	NULL);

	g_signal_connect (renderer, "toggled",
	G_CALLBACK (pgd_layers_visibility_changed),
	(gpointer)demo);
	gtk_tree_view_column_set_clickable (gtk_tree_view_get_column (GTK_TREE_VIEW (treeview), 1),
	TRUE);
	}

	gtk_tree_selection_set_mode (gtk_tree_view_get_selection (GTK_TREE_VIEW (treeview)),
	GTK_SELECTION_NONE);

	gtk_container_add (GTK_CONTAINER (swindow), treeview);
	gtk_widget_show (treeview);

	gtk_paned_add1 (GTK_PANED (hpaned), swindow);
	gtk_widget_show (swindow);

	gtk_paned_add2 (GTK_PANED (hpaned), viewer);
	gtk_widget_show (viewer);

	gtk_paned_set_position (GTK_PANED (hpaned), 150);

	g_object_weak_ref (G_OBJECT (hpaned),
	(GWeakNotify)pgd_layers_free,
	(gpointer)demo);

	return hpaned;
	}