Sylpheed

/*

 * Sylpheed -- a GTK+ based, lightweight, and fast e-mail client

 * Copyright (C) 1999-2005 Hiroyuki Yamamoto

 *

 * 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.h>

#include <glib/gi18n.h>

#include <gtk/gtkscrolledwindow.h>

#include <gtk/gtkimage.h>

#include <gdk-pixbuf/gdk-pixbuf.h>

#include "mainwindow.h"

#include "prefs_common.h"

#include "procmime.h"

#include "imageview.h"

#include "utils.h"

static gboolean get_resized_size(gint         w,

                                 gint         h,

                                 gint         aw,

                                 gint         ah,

                                 gint        *sw,

                                 gint        *sh);

static gint button_press_cb        (GtkWidget        *widget,

                                 GdkEventButton        *event,

                                 gpointer         data);

static void size_allocate_cb        (GtkWidget        *widget,

                                 GtkAllocation        *allocation,

                                 gpointer         data);

ImageView *imageview_create(void)

{

        ImageView *imageview;

        GtkWidget *scrolledwin;

        debug_print(_("Creating image view...\n"));

        imageview = g_new0(ImageView, 1);

        scrolledwin = gtk_scrolled_window_new(NULL, NULL);

        gtk_scrolled_window_set_policy(GTK_SCROLLED_WINDOW(scrolledwin),

                                       GTK_POLICY_AUTOMATIC,

                                       GTK_POLICY_AUTOMATIC);

        gtk_widget_set_size_request

                (scrolledwin, prefs_common.mainview_width, -1);

        g_signal_connect(G_OBJECT(scrolledwin), "button_press_event",

                         G_CALLBACK(button_press_cb), imageview);

        g_signal_connect(G_OBJECT(scrolledwin), "size_allocate",

                         G_CALLBACK(size_allocate_cb), imageview);

        gtk_widget_show_all(scrolledwin);

        imageview->scrolledwin  = scrolledwin;

        imageview->image        = NULL;

        imageview->image_data   = NULL;

        imageview->resize       = FALSE;

        imageview->resizing     = FALSE;

        return imageview;

}

void imageview_init(ImageView *imageview)

{

}

void imageview_show_image(ImageView *imageview, MimeInfo *mimeinfo,

                          const gchar *file, gboolean resize)

{

        GdkPixbuf *pixbuf;

        GError *error = NULL;

        g_return_if_fail(imageview != NULL);

        g_return_if_fail(imageview->scrolledwin != NULL);

        g_return_if_fail(imageview->scrolledwin->parent != NULL);

        if (file) {

                imageview_clear(imageview);

                pixbuf = gdk_pixbuf_new_from_file(file, &error);

                imageview->image_data = pixbuf;

        } else {

                pixbuf = (GdkPixbuf *)imageview->image_data;

        }

        if (error != NULL) {

                g_warning("%s\n", error->message);

                g_error_free(error);

        }

        if (!pixbuf) {

                g_warning(_("Can't load the image."));        

                return;

        }

        imageview->resize = resize;

        if (resize) {

                pixbuf = imageview_get_resized_pixbuf

                        (pixbuf, imageview->scrolledwin->parent, 8);

        } else

                g_object_ref(pixbuf);

        if (!imageview->image) {

                imageview->image = gtk_image_new_from_pixbuf(pixbuf);

                gtk_scrolled_window_add_with_viewport

                        (GTK_SCROLLED_WINDOW(imageview->scrolledwin),

                         imageview->image);

        } else

                gtk_image_set_from_pixbuf(GTK_IMAGE(imageview->image), pixbuf);

        g_object_unref(pixbuf);

        gtk_widget_show(imageview->image);

}

void imageview_clear(ImageView *imageview)

{

        GtkAdjustment *hadj, *vadj;

        if (imageview->image)

                gtk_image_set_from_pixmap(GTK_IMAGE(imageview->image),

                                          NULL, NULL);

        hadj = gtk_scrolled_window_get_hadjustment

                (GTK_SCROLLED_WINDOW(imageview->scrolledwin));

        gtk_adjustment_set_value(hadj, 0.0);

        vadj = gtk_scrolled_window_get_vadjustment

                (GTK_SCROLLED_WINDOW(imageview->scrolledwin));

        gtk_adjustment_set_value(vadj, 0.0);

        if (imageview->image_data) {

                g_object_unref(imageview->image_data);

                imageview->image_data = NULL;

        }

}

void imageview_destroy(ImageView *imageview)

{

        imageview_clear(imageview);

        g_free(imageview);

}

GdkPixbuf *imageview_get_resized_pixbuf(GdkPixbuf *pixbuf, GtkWidget *parent,

                                        gint margin)

{

        gint avail_width;

        gint avail_height;

        gint new_width;

        gint new_height;

        avail_width = parent->allocation.width;

        avail_height = parent->allocation.height;

        if (avail_width > margin) avail_width -= margin;

        if (avail_height > margin) avail_height -= margin;

        if (get_resized_size(gdk_pixbuf_get_width(pixbuf),

                             gdk_pixbuf_get_height(pixbuf),

                             avail_width, avail_height,

                             &new_width, &new_height))

                return gdk_pixbuf_scale_simple

                        (pixbuf, new_width, new_height, GDK_INTERP_BILINEAR);

        g_object_ref(pixbuf);

        return pixbuf;

}

static gboolean get_resized_size(gint w, gint h, gint aw, gint ah,

                                 gint *sw, gint *sh)

{

        gfloat wratio = 1.0;

        gfloat hratio = 1.0;

        gfloat ratio  = 1.0;

        if (w <= aw && h <= ah) {

                *sw = w;

                *sh = h;

                return FALSE;

        }

        if (w > aw)

                wratio = (gfloat)aw / (gfloat)w;

        if (h > ah)

                hratio = (gfloat)ah / (gfloat)h;

        ratio = (wratio > hratio) ? hratio : wratio;

        *sw = (gint)(w * ratio);

        *sh = (gint)(h * ratio);

        /* restrict minimum size */

        if (*sw < 16 || *sh < 16) {

                wratio = 16.0 / (gfloat)w;

                hratio = 16.0 / (gfloat)h;

                ratio = (wratio > hratio) ? wratio : hratio;

                if (ratio >= 1.0) {

                        *sw = w;

                        *sh = h;

                } else {

                        *sw = (gint)(w * ratio);

                        *sh = (gint)(h * ratio);

                }

        }

        return TRUE;

}

static gint button_press_cb(GtkWidget *widget, GdkEventButton *event,

                            gpointer data)

{

        ImageView *imageview = (ImageView *)data;

        if (event->button == 1 && imageview->image) {

                imageview_show_image(imageview, NULL, NULL, !imageview->resize);

                return TRUE;

        }

        return FALSE;

}

static void size_allocate_cb(GtkWidget *widget,GtkAllocation *allocation,

                             gpointer data)

{

        ImageView *imageview = (ImageView *)data;

        if (imageview->resize) {

                if (imageview->resizing) {

                        imageview->resizing = FALSE;

                        return;

                }

                if (!imageview->scrolledwin->parent)

                        return;

                if (!imageview->image_data)

                        return;

                imageview_show_image(imageview, NULL, NULL, TRUE);

                imageview->resizing = TRUE;

        }

}