path: root/libview/ev-document-model.c

/* this file is part of evince, a gnome document viewer
 *
 *  Copyright (C) 2009 Carlos Garcia Campos
 *  Copyright (C) 2005 Red Hat, Inc
 *
 * Evince 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.
 *
 * Evince 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.
 */

#include "config.h"

#include "ev-document-model.h"
#include "ev-view-type-builtins.h"
#include "ev-view-marshal.h"

struct _EvDocumentModel
{
	GObject base;

	EvDocument *document;
	gint n_pages;

	gint page;
	gint rotation;
	gdouble scale;
	EvSizingMode sizing_mode;

	gdouble max_scale;
	gdouble min_scale;
};

struct _EvDocumentModelClass
{
	GObjectClass base_class;

	/* Signals  */
	void (* page_changed) (EvDocumentModel *model,
			       gint             old_page,
			       gint             new_page);
};

enum {
	PROP_0,
	PROP_DOCUMENT,
	PROP_PAGE,
	PROP_ROTATION,
	PROP_SCALE,
	PROP_SIZING_MODE
};

enum
{
	PAGE_CHANGED,
	N_SIGNALS
};

static guint signals[N_SIGNALS] = { 0 };

G_DEFINE_TYPE (EvDocumentModel, ev_document_model, G_TYPE_OBJECT)

static void
ev_document_model_finalize (GObject *object)
{
	EvDocumentModel *model = EV_DOCUMENT_MODEL (object);

	if (model->document) {
		g_object_unref (model->document);
		model->document = NULL;
	}

	G_OBJECT_CLASS (ev_document_model_parent_class)->finalize (object);
}

static void
ev_document_model_set_property (GObject      *object,
				guint         prop_id,
				const GValue *value,
				GParamSpec   *pspec)
{
	EvDocumentModel *model = EV_DOCUMENT_MODEL (object);

	switch (prop_id) {
	case PROP_DOCUMENT:
		ev_document_model_set_document (model, (EvDocument *)g_value_get_object (value));
		break;
	case PROP_PAGE:
		ev_document_model_set_page (model, g_value_get_int (value));
		break;
	case PROP_ROTATION:
		ev_document_model_set_rotation (model, g_value_get_int (value));
		break;
	case PROP_SCALE:
		ev_document_model_set_scale (model, g_value_get_double (value));
		break;
	case PROP_SIZING_MODE:
		ev_document_model_set_sizing_mode (model, g_value_get_enum (value));
		break;
	default:
		G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
	}
}

static void
ev_document_model_get_property (GObject    *object,
				guint       prop_id,
				GValue     *value,
				GParamSpec *pspec)
{
	EvDocumentModel *model = EV_DOCUMENT_MODEL (object);

	switch (prop_id) {
	case PROP_DOCUMENT:
		g_value_set_object (value, model->document);
		break;
	case PROP_PAGE:
		g_value_set_int (value, model->page);
		break;
	case PROP_ROTATION:
		g_value_set_int (value, model->rotation);
		break;
	case PROP_SCALE:
		g_value_set_double (value, model->scale);
		break;
	case PROP_SIZING_MODE:
		g_value_set_enum (value, model->sizing_mode);
		break;
	default:
		G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
	}
}

static void
ev_document_model_class_init (EvDocumentModelClass *klass)
{
	GObjectClass *g_object_class = G_OBJECT_CLASS (klass);

	g_object_class->get_property = ev_document_model_get_property;
	g_object_class->set_property = ev_document_model_set_property;
	g_object_class->finalize = ev_document_model_finalize;

	/* Properties */
	g_object_class_install_property (g_object_class,
					 PROP_DOCUMENT,
					 g_param_spec_object ("document",
							      "Document",
							      "The current document",
							      EV_TYPE_DOCUMENT,
							      G_PARAM_READWRITE));
	g_object_class_install_property (g_object_class,
					 PROP_PAGE,
					 g_param_spec_int ("page",
							   "Page",
							   "Current page",
							   -1, G_MAXINT, -1,
							   G_PARAM_READWRITE));
	g_object_class_install_property (g_object_class,
					 PROP_ROTATION,
					 g_param_spec_int ("rotation",
							   "Rotation",
							   "Current rotation angle",
							   0, 360, 0,
							   G_PARAM_READWRITE));
	g_object_class_install_property (g_object_class,
					 PROP_SCALE,
					 g_param_spec_double ("scale",
							      "Scale",
							      "Current scale factor",
							      0., G_MAXDOUBLE, 1.,
							      G_PARAM_READWRITE));
	g_object_class_install_property (g_object_class,
					 PROP_SIZING_MODE,
					 g_param_spec_enum ("sizing-mode",
							    "Sizing Mode",
							    "Current sizing mode",
							    EV_TYPE_SIZING_MODE,
							    EV_SIZING_FIT_WIDTH,
							    G_PARAM_READWRITE));

	/* Signals */
	signals [PAGE_CHANGED] =
		g_signal_new ("page-changed",
			      EV_TYPE_DOCUMENT_MODEL,
			      G_SIGNAL_RUN_LAST,
			      G_STRUCT_OFFSET (EvDocumentModelClass, page_changed),
			      NULL, NULL,
			      ev_view_marshal_VOID__INT_INT,
			      G_TYPE_NONE, 2,
			      G_TYPE_INT, G_TYPE_INT);
}

static void
ev_document_model_init (EvDocumentModel *model)
{
	model->page = -1;
	model->scale = 1.;
	model->sizing_mode = EV_SIZING_FIT_WIDTH;
	model->min_scale = 0.;
	model->max_scale = G_MAXDOUBLE;
}

EvDocumentModel *
ev_document_model_new (void)
{
	return g_object_new (EV_TYPE_DOCUMENT_MODEL, NULL);
}

EvDocumentModel *
ev_document_model_new_with_document (EvDocument *document)
{
	g_return_val_if_fail (EV_IS_DOCUMENT (document), NULL);

	return g_object_new (EV_TYPE_DOCUMENT_MODEL, "document", document, NULL);
}

void
ev_document_model_set_document (EvDocumentModel *model,
				EvDocument      *document)
{
	g_return_if_fail (EV_IS_DOCUMENT_MODEL (model));
	g_return_if_fail (EV_IS_DOCUMENT (document));

	if (document == model->document)
		return;

	if (model->document)
		g_object_unref (model->document);
	model->document = g_object_ref (document);

	model->n_pages = ev_document_get_n_pages (document);
	ev_document_model_set_page (model, CLAMP (model->page, 0,
						  model->n_pages - 1));

	g_object_notify (G_OBJECT (model), "document");
}

EvDocument *
ev_document_model_get_document (EvDocumentModel *model)
{
	g_return_val_if_fail (EV_IS_DOCUMENT_MODEL (model), NULL);

	return model->document;
}

void
ev_document_model_set_page (EvDocumentModel *model,
			    gint             page)
{
	gint old_page;

	g_return_if_fail (EV_IS_DOCUMENT_MODEL (model));

	if (model->page == page)
		return;
	if (page < 0 || (model->document && page >= model->n_pages))
		return;

	old_page = model->page;
	model->page = page;
	g_signal_emit (model, signals[PAGE_CHANGED], 0, old_page, page);

	g_object_notify (G_OBJECT (model), "page");
}

void
ev_document_model_set_page_by_label (EvDocumentModel *model,
				     const gchar     *page_label)
{
	gint page;

	g_return_if_fail (EV_IS_DOCUMENT_MODEL (model));
	g_return_if_fail (model->document != NULL);

	if (ev_document_find_page_by_label (model->document, page_label, &page))
		ev_document_model_set_page (model, page);
}

gint
ev_document_model_get_page (EvDocumentModel *model)
{
	g_return_val_if_fail (EV_IS_DOCUMENT_MODEL (model), -1);

	return model->page;
}

void
ev_document_model_set_scale (EvDocumentModel *model,
			     gdouble          scale)
{
	g_return_if_fail (EV_IS_DOCUMENT_MODEL (model));

	scale = CLAMP (scale,
		       model->sizing_mode == EV_SIZING_FREE ?
		       model->min_scale : 0, model->max_scale);

	if (scale == model->scale)
		return;

	model->scale = scale;

	g_object_notify (G_OBJECT (model), "scale");
}

gdouble
ev_document_model_get_scale (EvDocumentModel *model)
{
	g_return_val_if_fail (EV_IS_DOCUMENT_MODEL (model), 1.0);

	return model->scale;
}

void
ev_document_model_set_max_scale (EvDocumentModel *model,
				 gdouble          max_scale)
{
	g_return_if_fail (EV_IS_DOCUMENT_MODEL (model));

	if (max_scale == model->max_scale)
		return;

	model->max_scale = max_scale;

	if (model->scale > max_scale)
		ev_document_model_set_scale (model, max_scale);
}

gdouble
ev_document_model_get_max_scale (EvDocumentModel *model)
{
	g_return_val_if_fail (EV_IS_DOCUMENT_MODEL (model), 1.0);

	return model->max_scale;
}

void
ev_document_model_set_min_scale (EvDocumentModel *model,
				 gdouble          min_scale)
{
	g_return_if_fail (EV_IS_DOCUMENT_MODEL (model));

	if (min_scale == model->min_scale)
		return;

	model->min_scale = min_scale;

	if (model->scale < min_scale)
		ev_document_model_set_scale (model, min_scale);
}

gdouble
ev_document_model_get_min_scale (EvDocumentModel *model)
{
	g_return_val_if_fail (EV_IS_DOCUMENT_MODEL (model), 0.);

	return model->min_scale;
}

void
ev_document_model_set_sizing_mode (EvDocumentModel *model,
				   EvSizingMode     mode)
{
	g_return_if_fail (EV_IS_DOCUMENT_MODEL (model));

	if (mode == model->sizing_mode)
		return;

	model->sizing_mode = mode;

	g_object_notify (G_OBJECT (model), "sizing-mode");
}

EvSizingMode
ev_document_model_get_sizing_mode (EvDocumentModel *model)
{
	g_return_val_if_fail (EV_IS_DOCUMENT_MODEL (model), EV_SIZING_FIT_WIDTH);

	return model->sizing_mode;
}

void
ev_document_model_set_rotation (EvDocumentModel *model,
				gint             rotation)
{
	g_return_if_fail (EV_IS_DOCUMENT_MODEL (model));

	if (rotation >= 360)
		rotation -= 360;
	else if (rotation < 0)
		rotation += 360;

	if (rotation == model->rotation)
		return;

	model->rotation = rotation;

	g_object_notify (G_OBJECT (model), "rotation");
}

gint
ev_document_model_get_rotation (EvDocumentModel *model)
{
	g_return_val_if_fail (EV_IS_DOCUMENT_MODEL (model), 0);

	return model->rotation;
}