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 "defs.h"

#include <glib.h>

#include <glib/gi18n.h>

#include <gdk/gdkkeysyms.h>

#include <gtk/gtkscrolledwindow.h>

#include <gtk/gtkctree.h>

#include <gtk/gtkvbox.h>

#include <gtk/gtkvpaned.h>

#include <gtk/gtksignal.h>

#include <gtk/gtkmenu.h>

#include <gtk/gtkdnd.h>

#include <gtk/gtkselection.h>

#include <stdio.h>

#include <unistd.h>

#include "main.h"

#include "mimeview.h"

#include "textview.h"

#include "imageview.h"

#include "procmime.h"

#include "summaryview.h"

#include "menu.h"

#include "filesel.h"

#include "alertpanel.h"

#include "inputdialog.h"

#include "utils.h"

#include "gtkutils.h"

#include "prefs_common.h"

#include "rfc2015.h"

typedef enum

{

        COL_MIMETYPE = 0,

        COL_SIZE     = 1,

        COL_NAME     = 2

} MimeViewColumnPos;

#define N_MIMEVIEW_COLS        3

static void mimeview_set_multipart_tree                (MimeView        *mimeview,

                                                 MimeInfo        *mimeinfo,

                                                 GtkCTreeNode        *parent);

static GtkCTreeNode *mimeview_append_part        (MimeView        *mimeview,

                                                 MimeInfo        *partinfo,

                                                 GtkCTreeNode        *parent);

static void mimeview_show_message_part                (MimeView        *mimeview,

                                                 MimeInfo        *partinfo);

static void mimeview_show_image_part                (MimeView        *mimeview,

                                                 MimeInfo        *partinfo);

static void mimeview_show_mime_part                (MimeView        *mimeview,

                                                 MimeInfo        *partinfo);

#if USE_GPGME

static void mimeview_show_signature_part        (MimeView        *mimeview,

                                                 MimeInfo        *partinfo);

#endif

static void mimeview_change_view_type                (MimeView        *mimeview,

                                                 MimeViewType         type);

static void mimeview_selected                (GtkCTree        *ctree,

                                         GtkCTreeNode        *node,

                                         gint                 column,

                                         MimeView        *mimeview);

static void mimeview_start_drag         (GtkWidget        *widget,

                                         gint                 button,

                                         GdkEvent        *event,

                                         MimeView        *mimeview);

static gint mimeview_button_pressed        (GtkWidget        *widget,

                                         GdkEventButton        *event,

                                         MimeView        *mimeview);

static gint mimeview_key_pressed        (GtkWidget        *widget,

                                         GdkEventKey        *event,

                                         MimeView        *mimeview);

static void mimeview_drag_data_get      (GtkWidget          *widget,

                                         GdkDragContext   *drag_context,

                                         GtkSelectionData *selection_data,

                                         guint                   info,

                                         guint                   time,

                                         MimeView          *mimeview);

static void mimeview_display_as_text        (MimeView        *mimeview);

static void mimeview_launch                (MimeView        *mimeview);

static void mimeview_open_with                (MimeView        *mimeview);

static void mimeview_view_file                (const gchar        *filename,

                                         MimeInfo        *partinfo,

                                         const gchar        *cmdline);

#if USE_GPGME

static void mimeview_check_signature        (MimeView        *mimeview);

#endif

static GtkItemFactoryEntry mimeview_popup_entries[] =

{

        {N_("/_Open"),                  NULL, mimeview_launch,          0, NULL},

        {N_("/Open _with..."),          NULL, mimeview_open_with,          0, NULL},

        {N_("/_Display as text"), NULL, mimeview_display_as_text, 0, NULL},

        {N_("/_Save as..."),          NULL, mimeview_save_as,          0, NULL}

#if USE_GPGME

        ,

        {N_("/_Check signature"), NULL, mimeview_check_signature, 0, NULL}

#endif

};

static GtkTargetEntry mimeview_mime_types[] =

{

        {"text/uri-list", 0, 0}

};

MimeView *mimeview_create(void)

{

        MimeView *mimeview;

        GtkWidget *paned;

        GtkWidget *scrolledwin;

        GtkWidget *ctree;

        GtkWidget *mime_vbox;

        GtkWidget *popupmenu;

        GtkItemFactory *popupfactory;

        gchar *titles[N_MIMEVIEW_COLS];

        gint n_entries;

        gint i;

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

        mimeview = g_new0(MimeView, 1);

        titles[COL_MIMETYPE] = _("MIME Type");

        titles[COL_SIZE]     = _("Size");

        titles[COL_NAME]     = _("Name");

        scrolledwin = gtk_scrolled_window_new(NULL, NULL);

        gtk_scrolled_window_set_policy(GTK_SCROLLED_WINDOW(scrolledwin),

                                       GTK_POLICY_AUTOMATIC,

                                       GTK_POLICY_ALWAYS);

        gtk_widget_set_size_request(scrolledwin, -1, 80);

        ctree = gtk_sctree_new_with_titles(N_MIMEVIEW_COLS, 0, titles);

        gtk_clist_set_selection_mode(GTK_CLIST(ctree), GTK_SELECTION_BROWSE);

        gtk_ctree_set_line_style(GTK_CTREE(ctree), GTK_CTREE_LINES_NONE);

        gtk_clist_set_column_justification(GTK_CLIST(ctree), COL_SIZE,

                                           GTK_JUSTIFY_RIGHT);

        gtk_clist_set_column_width(GTK_CLIST(ctree), COL_MIMETYPE, 240);

        gtk_clist_set_column_width(GTK_CLIST(ctree), COL_SIZE, 64);

        for (i = 0; i < N_MIMEVIEW_COLS; i++)

                GTK_WIDGET_UNSET_FLAGS(GTK_CLIST(ctree)->column[i].button,

                                       GTK_CAN_FOCUS);

        gtk_container_add(GTK_CONTAINER(scrolledwin), ctree);

        g_signal_connect(G_OBJECT(ctree), "tree_select_row",

                         G_CALLBACK(mimeview_selected), mimeview);

        g_signal_connect(G_OBJECT(ctree), "button_press_event",

                         G_CALLBACK(mimeview_button_pressed), mimeview);

        g_signal_connect(G_OBJECT(ctree), "key_press_event",

                         G_CALLBACK(mimeview_key_pressed), mimeview);

        g_signal_connect(G_OBJECT (ctree),"start_drag",

                         G_CALLBACK (mimeview_start_drag), mimeview);

        g_signal_connect(G_OBJECT(ctree), "drag_data_get",

                         G_CALLBACK(mimeview_drag_data_get), mimeview);

        mime_vbox = gtk_vbox_new(FALSE, 0);

        gtk_container_set_reallocate_redraws(GTK_CONTAINER(mime_vbox), TRUE);

        paned = gtk_vpaned_new();

        gtk_paned_add1(GTK_PANED(paned), scrolledwin);

        gtk_paned_add2(GTK_PANED(paned), mime_vbox);

        n_entries = sizeof(mimeview_popup_entries) /

                sizeof(mimeview_popup_entries[0]);

        popupmenu = menu_create_items(mimeview_popup_entries, n_entries,

                                      "<MimeView>", &popupfactory, mimeview);

        mimeview->paned        = paned;

        mimeview->scrolledwin  = scrolledwin;

        mimeview->ctree        = ctree;

        mimeview->mime_vbox    = mime_vbox;

        mimeview->popupmenu    = popupmenu;

        mimeview->popupfactory = popupfactory;

        mimeview->type         = -1;

        return mimeview;

}

void mimeview_init(MimeView *mimeview)

{

        textview_init(mimeview->textview);

        imageview_init(mimeview->imageview);

}

/* 

 * Check whether the message is OpenPGP signed

 */

#if USE_GPGME

static gboolean mimeview_is_signed(MimeView *mimeview)

{

        MimeInfo *partinfo;

        debug_print("mimeview_is signed of %p\n", mimeview);

        if (!mimeview) return FALSE;

        if (!mimeview->opened) return FALSE;

        debug_print("mimeview_is_signed: open\n" );

        if (!mimeview->file) return FALSE;

        debug_print("mimeview_is_signed: file\n" );

        partinfo = mimeview_get_selected_part(mimeview);

        g_return_val_if_fail(partinfo != NULL, FALSE);

        /* walk the tree and see whether there is a signature somewhere */

        do {

                if (rfc2015_has_signature(partinfo))

                        return TRUE;

        } while ((partinfo = partinfo->parent) != NULL);

        debug_print("mimeview_is_signed: FALSE\n" );

        return FALSE;

}

static void set_unchecked_signature(MimeInfo *mimeinfo)

{

        MimeInfo **signedinfo;

        signedinfo = rfc2015_find_signature(mimeinfo);

        if (signedinfo == NULL) return;

        g_free(signedinfo[1]->sigstatus);

        signedinfo[1]->sigstatus =

                g_strdup(_("Select \"Check signature\" to check"));

        g_free(signedinfo[1]->sigstatus_full);

        signedinfo[1]->sigstatus_full = NULL;

    g_free(signedinfo);

}

#endif /* USE_GPGME */

void mimeview_show_message(MimeView *mimeview, MimeInfo *mimeinfo,

                           const gchar *file)

{

        GtkCTree *ctree = GTK_CTREE(mimeview->ctree);

        GtkCTreeNode *node;

        mimeview_clear(mimeview);

        textview_clear(mimeview->messageview->textview);

        g_return_if_fail(file != NULL);

        g_return_if_fail(mimeinfo != NULL);

        mimeview->mimeinfo = mimeinfo;

        mimeview->file = g_strdup(file);

#if USE_GPGME

        if (prefs_common.auto_check_signatures) {

                FILE *fp;

                if ((fp = fopen(file, "rb")) == NULL) {

                        FILE_OP_ERROR(file, "fopen");

                        return;

                }

                rfc2015_check_signature(mimeinfo, fp);

                fclose(fp);

        } else

                set_unchecked_signature(mimeinfo);

#endif

        g_signal_handlers_block_by_func

                (G_OBJECT(ctree), G_CALLBACK(mimeview_selected), mimeview);

        mimeview_set_multipart_tree(mimeview, mimeinfo, NULL);

        g_signal_handlers_unblock_by_func

                (G_OBJECT(ctree), G_CALLBACK(mimeview_selected), mimeview);

        /* search first text part */

        for (node = GTK_CTREE_NODE(GTK_CLIST(ctree)->row_list);

             node != NULL; node = GTK_CTREE_NODE_NEXT(node)) {

                MimeInfo *partinfo;

                partinfo = gtk_ctree_node_get_row_data(ctree, node);

                if (partinfo &&

                    (partinfo->mime_type == MIME_TEXT ||

                     partinfo->mime_type == MIME_TEXT_HTML))

                        break;

        }

        textview_show_message(mimeview->messageview->textview, mimeinfo, file);

        if (!node)

                node = GTK_CTREE_NODE(GTK_CLIST(ctree)->row_list);

        if (node) {

                gtk_ctree_select(ctree, node);

                gtkut_ctree_set_focus_row(ctree, node);

                if (mimeview_get_selected_part(mimeview))

                        gtk_widget_grab_focus(mimeview->ctree);

        }

}

void mimeview_clear(MimeView *mimeview)

{

        GtkCList *clist = GTK_CLIST(mimeview->ctree);

        procmime_mimeinfo_free_all(mimeview->mimeinfo);

        mimeview->mimeinfo = NULL;

        gtk_clist_clear(clist);

        textview_clear(mimeview->textview);

        imageview_clear(mimeview->imageview);

        mimeview->opened = NULL;

        g_free(mimeview->file);

        mimeview->file = NULL;

}

void mimeview_destroy(MimeView *mimeview)

{

        textview_destroy(mimeview->textview);

        imageview_destroy(mimeview->imageview);

        procmime_mimeinfo_free_all(mimeview->mimeinfo);

        g_free(mimeview->file);

        g_free(mimeview);

}

MimeInfo *mimeview_get_selected_part(MimeView *mimeview)

{

        if (gtk_notebook_get_current_page

                (GTK_NOTEBOOK(mimeview->messageview->notebook)) == 0)

                return NULL;

        return gtk_ctree_node_get_row_data

                (GTK_CTREE(mimeview->ctree), mimeview->opened);

}

gboolean mimeview_step(MimeView *mimeview, GtkScrollType type)

{

        GtkCTree *ctree = GTK_CTREE(mimeview->ctree);

        GtkCTreeNode *node;

        if (type == GTK_SCROLL_STEP_FORWARD) {

                node = gtkut_ctree_node_next(ctree, mimeview->opened);

                if (node)

                        gtkut_ctree_expand_parent_all(ctree, node);

                else

                        return FALSE;

        } else {

                if (mimeview->opened) {

                        node = GTK_CTREE_NODE_PREV(mimeview->opened);

                        if (!node) return FALSE;

                } else

                        return FALSE;

        }

        g_signal_emit_by_name(G_OBJECT(ctree), "scroll_vertical", type, 0.0);

        return TRUE;

}

static void mimeview_set_multipart_tree(MimeView *mimeview,

                                        MimeInfo *mimeinfo,

                                        GtkCTreeNode *parent)

{

        GtkCTreeNode *node;

        g_return_if_fail(mimeinfo != NULL);

        if (mimeinfo->children)

                mimeinfo = mimeinfo->children;

        while (mimeinfo != NULL) {

                node = mimeview_append_part(mimeview, mimeinfo, parent);

                if (mimeinfo->children)

                        mimeview_set_multipart_tree(mimeview, mimeinfo, node);

                else if (mimeinfo->sub &&

                         mimeinfo->sub->mime_type != MIME_TEXT &&

                         mimeinfo->sub->mime_type != MIME_TEXT_HTML)

                        mimeview_set_multipart_tree(mimeview, mimeinfo->sub,

                                                    node);

                mimeinfo = mimeinfo->next;

        }

}

static gchar *get_part_name(MimeInfo *partinfo)

{

#if USE_GPGME

        if (partinfo->sigstatus)

                return partinfo->sigstatus;

        else

#endif

        if (partinfo->name)

                return partinfo->name;

        else if (partinfo->filename)

                return partinfo->filename;

        else

                return "";

}

static GtkCTreeNode *mimeview_append_part(MimeView *mimeview,

                                          MimeInfo *partinfo,

                                          GtkCTreeNode *parent)

{

        GtkCTree *ctree = GTK_CTREE(mimeview->ctree);

        GtkCTreeNode *node;

        gchar *str[N_MIMEVIEW_COLS];

        str[COL_MIMETYPE] =

                partinfo->content_type ? partinfo->content_type : "";

        str[COL_SIZE] = to_human_readable(partinfo->size);

        str[COL_NAME] = get_part_name(partinfo);

        node = gtk_ctree_insert_node(ctree, parent, NULL, str, 0,

                                     NULL, NULL, NULL, NULL,

                                     FALSE, TRUE);

        gtk_ctree_node_set_row_data(ctree, node, partinfo);

        return node;

}

static void mimeview_show_message_part(MimeView *mimeview, MimeInfo *partinfo)

{

        FILE *fp;

        const gchar *fname;

#if USE_GPGME

        MimeInfo *pi;

#endif

        if (!partinfo) return;

#if USE_GPGME

        for (pi = partinfo; pi && !pi->plaintextfile ; pi = pi->parent)

                ;

        fname = pi ? pi->plaintextfile : mimeview->file;

#else

        fname = mimeview->file;

#endif /* USE_GPGME */

        if (!fname) return;

        if ((fp = fopen(fname, "rb")) == NULL) {

                FILE_OP_ERROR(fname, "fopen");

                return;

        }

        if (fseek(fp, partinfo->fpos, SEEK_SET) < 0) {

                FILE_OP_ERROR(mimeview->file, "fseek");

                fclose(fp);

                return;

        }

        mimeview_change_view_type(mimeview, MIMEVIEW_TEXT);

        textview_show_part(mimeview->textview, partinfo, fp);

        fclose(fp);

}

static void mimeview_show_image_part(MimeView *mimeview, MimeInfo *partinfo)

{

        gchar *filename;

        if (!partinfo) return;

        filename = procmime_get_tmp_file_name(partinfo);

        if (procmime_get_part(filename, mimeview->file, partinfo) < 0)

                alertpanel_error

                        (_("Can't get the part of multipart message."));

        else {

                mimeview_change_view_type(mimeview, MIMEVIEW_IMAGE);

                imageview_show_image(mimeview->imageview, partinfo, filename,

                                     prefs_common.resize_image);

                unlink(filename);

        }

        g_free(filename);

}

static void save_as_button_clicked(GtkWidget *widget, gpointer data)

{

        MimeView *mimeview = (MimeView *)data;

        mimeview_save_as(mimeview);

}

static void display_as_text_button_clicked(GtkWidget *widget, gpointer data)

{

        MimeView *mimeview = (MimeView *)data;

        mimeview_display_as_text(mimeview);

}

static void open_button_clicked(GtkWidget *widget, gpointer data)

{

        MimeView *mimeview = (MimeView *)data;

        mimeview_launch(mimeview);

}

static void open_with_button_clicked(GtkWidget *widget, gpointer data)

{

        MimeView *mimeview = (MimeView *)data;

        mimeview_open_with(mimeview);

}

static void mimeview_show_mime_part(MimeView *mimeview, MimeInfo *partinfo)

{

        TextView *textview = mimeview->textview;

        GtkTextBuffer *buffer;

        GtkTextIter iter;

        GtkTextChildAnchor *anchor;

        GtkWidget *vbbox;

        GtkWidget *button;

        gchar buf[BUFFSIZE];

        if (!partinfo) return;

        textview_set_font(textview, NULL);

        textview_clear(textview);

        buffer = gtk_text_view_get_buffer(GTK_TEXT_VIEW(textview->text));

        gtk_text_buffer_get_start_iter(buffer, &iter);

        gtk_text_buffer_insert(buffer, &iter,

                               _("Select an action for the attached file:\n"),

                               -1);

        if (partinfo->filename || partinfo->name)

                g_snprintf(buf, sizeof(buf), "[%s  %s (%d bytes)]\n\n",

                           partinfo->filename ? partinfo->filename :

                           partinfo->name,

                           partinfo->content_type, partinfo->size);

        else

                g_snprintf(buf, sizeof(buf), "[%s (%d bytes)]\n\n",

                           partinfo->content_type, partinfo->size);

        gtk_text_buffer_insert(buffer, &iter, buf, -1);

        vbbox = gtk_vbutton_box_new();

        gtk_box_set_spacing(GTK_BOX(vbbox), 5);

        button = gtk_button_new_from_stock(GTK_STOCK_OPEN);

        gtk_container_add(GTK_CONTAINER(vbbox), button);

        g_signal_connect(button, "clicked", G_CALLBACK(open_button_clicked),

                         mimeview);

        button = gtk_button_new_with_mnemonic(_("Open _with..."));

        gtk_container_add(GTK_CONTAINER(vbbox), button);

        g_signal_connect(button, "clicked",

                         G_CALLBACK(open_with_button_clicked), mimeview);

        button = gtk_button_new_with_mnemonic(_("_Display as text"));

        gtk_container_add(GTK_CONTAINER(vbbox), button);

        g_signal_connect(button, "clicked",

                         G_CALLBACK(display_as_text_button_clicked), mimeview);

        button = gtk_button_new_with_mnemonic(_("_Save as..."));

        gtk_container_add(GTK_CONTAINER(vbbox), button);

        g_signal_connect(button, "clicked", G_CALLBACK(save_as_button_clicked),

                         mimeview);

        gtk_widget_show_all(vbbox);

        anchor = gtk_text_buffer_create_child_anchor(buffer, &iter);

        gtk_text_view_add_child_at_anchor(GTK_TEXT_VIEW(textview->text),

                                          vbbox, anchor);

}

#if USE_GPGME

static void check_signature_button_clicked(GtkWidget *widget, gpointer data)

{

        MimeView *mimeview = (MimeView *)data;

        mimeview_check_signature(mimeview);

}

static void mimeview_show_signature_part(MimeView *mimeview,

                                         MimeInfo *partinfo)

{

        TextView *textview = mimeview->textview;

        GtkTextBuffer *buffer;

        GtkTextIter iter;

        GtkTextChildAnchor *anchor;

        GtkWidget *vbbox;

        GtkWidget *button;

        if (!partinfo) return;

        textview_set_font(textview, NULL);

        textview_clear(textview);

        buffer = gtk_text_view_get_buffer(GTK_TEXT_VIEW(textview->text));

        gtk_text_buffer_get_start_iter(buffer, &iter);

        if (partinfo->sigstatus_full) {

                gtk_text_buffer_insert

                        (buffer, &iter, partinfo->sigstatus_full, -1);

                return;

        }

        gtk_text_buffer_insert

                (buffer, &iter,

                 _("This signature has not been checked yet.\n\n"), -1);

        vbbox = gtk_vbutton_box_new();

        gtk_box_set_spacing(GTK_BOX(vbbox), 5);

        button = gtk_button_new_with_mnemonic(_("_Check signature"));

        gtk_container_add(GTK_CONTAINER(vbbox), button);

        g_signal_connect(button, "clicked",

                         G_CALLBACK(check_signature_button_clicked), mimeview);

        gtk_widget_show_all(vbbox);

        anchor = gtk_text_buffer_create_child_anchor(buffer, &iter);

        gtk_text_view_add_child_at_anchor(GTK_TEXT_VIEW(textview->text),

                                          vbbox, anchor);

}

#endif /* USE_GPGME */

static void mimeview_change_view_type(MimeView *mimeview, MimeViewType type)

{

        TextView  *textview  = mimeview->textview;

        ImageView *imageview = mimeview->imageview;

        GList *children;

        if (mimeview->type == type) return;

        children = gtk_container_get_children

                (GTK_CONTAINER(mimeview->mime_vbox));

        if (children) {

                gtkut_container_remove(GTK_CONTAINER(mimeview->mime_vbox),

                                       GTK_WIDGET(children->data));

                g_list_free(children);

        }

        switch (type) {

        case MIMEVIEW_IMAGE:

                gtk_container_add(GTK_CONTAINER(mimeview->mime_vbox),

                                  GTK_WIDGET_PTR(imageview));

                break;

        case MIMEVIEW_TEXT:

                gtk_container_add(GTK_CONTAINER(mimeview->mime_vbox),

                                  GTK_WIDGET_PTR(textview));

                break;

        default:

                return;

        }

        mimeview->type = type;

}

static void mimeview_selected(GtkCTree *ctree, GtkCTreeNode *node, gint column,

                              MimeView *mimeview)

{

        MimeInfo *partinfo;

        if (mimeview->opened == node) return;

        mimeview->opened = node;

        gtk_ctree_node_moveto(ctree, node, -1, 0.5, 0);

        partinfo = gtk_ctree_node_get_row_data(ctree, node);

        if (!partinfo) return;

        /* ungrab the mouse event */

        if (GTK_WIDGET_HAS_GRAB(ctree)) {

                gtk_grab_remove(GTK_WIDGET(ctree));

                if (gdk_pointer_is_grabbed())

                        gdk_pointer_ungrab(GDK_CURRENT_TIME);

        }

        switch (partinfo->mime_type) {

        case MIME_TEXT:

        case MIME_TEXT_HTML:

        case MIME_MESSAGE_RFC822:

        case MIME_MULTIPART:

                mimeview_show_message_part(mimeview, partinfo);

                break;

        case MIME_IMAGE:

                mimeview_show_image_part(mimeview, partinfo);

                break;

        default:

                mimeview_change_view_type(mimeview, MIMEVIEW_TEXT);

#if USE_GPGME

                if (g_strcasecmp(partinfo->content_type,

                                 "application/pgp-signature") == 0)

                        mimeview_show_signature_part(mimeview, partinfo);

                else

#endif

                        mimeview_show_mime_part(mimeview, partinfo);

                break;

        }

}

static void mimeview_start_drag(GtkWidget *widget, gint button,

                                GdkEvent *event, MimeView *mimeview)

{

        GtkTargetList *list;

        GdkDragContext *context;

        MimeInfo *partinfo;

        g_return_if_fail(mimeview != NULL);

        partinfo = mimeview_get_selected_part(mimeview);

        if (partinfo->filename == NULL && partinfo->name == NULL) return;

        list = gtk_target_list_new(mimeview_mime_types, 1);

        context = gtk_drag_begin(widget, list,

                                 GDK_ACTION_COPY, button, event);

        gtk_drag_set_icon_default(context);

}

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

                                    MimeView *mimeview)

{

        GtkCList *clist = GTK_CLIST(widget);

        MimeInfo *partinfo;

        gint row, column;

        if (!event) return FALSE;

        if (event->button == 2 || event->button == 3) {

                if (!gtk_clist_get_selection_info(clist, event->x, event->y,

                                                  &row, &column))

                        return FALSE;

                gtk_clist_unselect_all(clist);

                gtk_clist_select_row(clist, row, column);

                gtkut_clist_set_focus_row(clist, row);

        }

        if (event->button == 2 ||

            (event->button == 1 && event->type == GDK_2BUTTON_PRESS)) {

                /* call external program for image, audio or html */

                mimeview_launch(mimeview);

        } else if (event->button == 3) {

                partinfo = mimeview_get_selected_part(mimeview);

                if (partinfo && (partinfo->mime_type == MIME_TEXT ||

                                 partinfo->mime_type == MIME_TEXT_HTML ||

                                 partinfo->mime_type == MIME_MESSAGE_RFC822 ||

                                 partinfo->mime_type == MIME_IMAGE ||

                                 partinfo->mime_type == MIME_MULTIPART))

                        menu_set_sensitive(mimeview->popupfactory,

                                           "/Display as text", FALSE);

                else

                        menu_set_sensitive(mimeview->popupfactory,

                                           "/Display as text", TRUE);

                if (partinfo &&

                    partinfo->mime_type == MIME_APPLICATION_OCTET_STREAM)

                        menu_set_sensitive(mimeview->popupfactory,

                                           "/Open", FALSE);

                else

                        menu_set_sensitive(mimeview->popupfactory,

                                           "/Open", TRUE);

#if USE_GPGME

                menu_set_sensitive(mimeview->popupfactory,

                                   "/Check signature",

                                   mimeview_is_signed(mimeview));

#endif

                gtk_menu_popup(GTK_MENU(mimeview->popupmenu),

                               NULL, NULL, NULL, NULL,

                               event->button, event->time);

                return TRUE;

        }

        return FALSE;

}

void mimeview_pass_key_press_event(MimeView *mimeview, GdkEventKey *event)

{

        mimeview_key_pressed(mimeview->ctree, event, mimeview);

}

#define BREAK_ON_MODIFIER_KEY() \

        if ((event->state & (GDK_MOD1_MASK|GDK_CONTROL_MASK)) != 0) break

#define KEY_PRESS_EVENT_STOP() \

        g_signal_stop_emission_by_name(G_OBJECT(ctree), "key_press_event");

static gint mimeview_key_pressed(GtkWidget *widget, GdkEventKey *event,

                                 MimeView *mimeview)

{

        SummaryView *summaryview = NULL;

        GtkCTree *ctree = GTK_CTREE(widget);

        GtkCTreeNode *node;

        gboolean mod_pressed;

        if (!event) return FALSE;

        if (!mimeview->opened) return FALSE;

        if (mimeview->messageview->mainwin)

                summaryview = mimeview->messageview->mainwin->summaryview;

        mod_pressed =

                ((event->state & (GDK_SHIFT_MASK|GDK_MOD1_MASK)) != 0);

        switch (event->keyval) {

        case GDK_space:

                if (textview_scroll_page(mimeview->textview, mod_pressed))

                        return TRUE;

                node = GTK_CTREE_NODE_NEXT(mimeview->opened);

                if (node) {

                        gtk_sctree_unselect_all(GTK_SCTREE(ctree));

                        gtk_sctree_select(GTK_SCTREE(ctree), node);

                        return TRUE;

                }

                if (summaryview)

                        summary_pass_key_press_event(summaryview, event);

                break;

        case GDK_BackSpace:

                textview_scroll_page(mimeview->textview, TRUE);

                return TRUE;

        case GDK_Return:

                textview_scroll_one_line(mimeview->textview, mod_pressed);

                return TRUE;

        case GDK_t:

                BREAK_ON_MODIFIER_KEY();

                KEY_PRESS_EVENT_STOP();

                mimeview_display_as_text(mimeview);

                return TRUE;

        case GDK_Left:

        case GDK_Escape:

        case GDK_Delete:

                if (summaryview)

                        summary_pass_key_press_event(summaryview, event);

                break;

        default:

                break;

        }

        return FALSE;

}

static void mimeview_drag_data_get(GtkWidget            *widget,

                                   GdkDragContext   *drag_context,

                                   GtkSelectionData *selection_data,

                                   guint             info,

                                   guint             time,

                                   MimeView            *mimeview)

{

        gchar *filename, *uriname;

        const gchar *bname;

        MimeInfo *partinfo;

        if (!mimeview->opened) return;

        if (!mimeview->file) return;

        partinfo = mimeview_get_selected_part(mimeview);

        if (!partinfo) return;

        if (!partinfo->filename && !partinfo->name) return;

        filename = partinfo->filename ? partinfo->filename : partinfo->name;

        bname = g_basename(filename);

        if (*bname == '\0') return;

        filename = g_strconcat(get_mime_tmp_dir(), G_DIR_SEPARATOR_S,

                               bname, NULL);

        if (procmime_get_part(filename, mimeview->file, partinfo) < 0)

                alertpanel_error

                        (_("Can't save the part of multipart message."));

        uriname = g_strconcat("file://", filename, NULL);

        gtk_selection_data_set(selection_data, selection_data->target, 8,

                               uriname, strlen(uriname));

        g_free(uriname);

        g_free(filename);

}

static void mimeview_display_as_text(MimeView *mimeview)

{

        MimeInfo *partinfo;

        if (!mimeview->opened) return;

        partinfo = mimeview_get_selected_part(mimeview);

        g_return_if_fail(partinfo != NULL);

        mimeview_show_message_part(mimeview, partinfo);

}

void mimeview_save_as(MimeView *mimeview)

{

        gchar *filename;

        gchar *defname = NULL;

        MimeInfo *partinfo;

        if (!mimeview->opened) return;

        if (!mimeview->file) return;

        partinfo = mimeview_get_selected_part(mimeview);

        g_return_if_fail(partinfo != NULL);

        if (partinfo->filename)

                defname = partinfo->filename;

        else if (partinfo->name) {

                Xstrdup_a(defname, partinfo->name, return);

                subst_for_filename(defname);

        }

        filename = filesel_save_as(defname);

        if (!filename) return;

        if (procmime_get_part(filename, mimeview->file, partinfo) < 0)

                alertpanel_error

                        (_("Can't save the part of multipart message."));

        g_free(filename);

}

static void mimeview_launch(MimeView *mimeview)

{

        MimeInfo *partinfo;

        gchar *filename;

        if (!mimeview->opened) return;

        if (!mimeview->file) return;

        partinfo = mimeview_get_selected_part(mimeview);

        g_return_if_fail(partinfo != NULL);

        filename = procmime_get_tmp_file_name(partinfo);

        if (procmime_get_part(filename, mimeview->file, partinfo) < 0)

                alertpanel_error

                        (_("Can't save the part of multipart message."));

        else

                mimeview_view_file(filename, partinfo, NULL);

        g_free(filename);

}

static void mimeview_open_with(MimeView *mimeview)

{

        MimeInfo *partinfo;

        gchar *filename;

        gchar *cmd;

        if (!mimeview->opened) return;

        if (!mimeview->file) return;

        partinfo = mimeview_get_selected_part(mimeview);

        g_return_if_fail(partinfo != NULL);

        filename = procmime_get_tmp_file_name(partinfo);

        if (procmime_get_part(filename, mimeview->file, partinfo) < 0) {

                alertpanel_error

                        (_("Can't save the part of multipart message."));

                g_free(filename);

                return;

        }

        if (!prefs_common.mime_open_cmd_history)

                prefs_common.mime_open_cmd_history =

                        add_history(NULL, prefs_common.mime_open_cmd);

        cmd = input_dialog_combo

                (_("Open with"),

                 _("Enter the command line to open file:\n"

                   "(`%s' will be replaced with file name)"),

                 prefs_common.mime_open_cmd,

                 prefs_common.mime_open_cmd_history,

                 TRUE);

        if (cmd) {

                mimeview_view_file(filename, partinfo, cmd);

                g_free(prefs_common.mime_open_cmd);

                prefs_common.mime_open_cmd = cmd;

                prefs_common.mime_open_cmd_history =

                        add_history(prefs_common.mime_open_cmd_history, cmd);

        }

        g_free(filename);

}

static void mimeview_view_file(const gchar *filename, MimeInfo *partinfo,

                               const gchar *cmdline)

{

        static gchar *default_image_cmdline = "display '%s'";

        static gchar *default_audio_cmdline = "play '%s'";

        static gchar *default_html_cmdline = DEFAULT_BROWSER_CMD;

        static gchar *mime_cmdline = "metamail -d -b -x -c %s '%s'";

        gchar buf[1024];

        gchar m_buf[1024];

        const gchar *cmd;

        const gchar *def_cmd;

        const gchar *p;

        if (cmdline) {

                cmd = cmdline;

                def_cmd = NULL;

        } else if (MIME_APPLICATION_OCTET_STREAM == partinfo->mime_type) {

                return;

        } else if (MIME_IMAGE == partinfo->mime_type) {

                cmd = prefs_common.mime_image_viewer;

                def_cmd = default_image_cmdline;

        } else if (MIME_AUDIO == partinfo->mime_type) {

                cmd = prefs_common.mime_audio_player;

                def_cmd = default_audio_cmdline;

        } else if (MIME_TEXT_HTML == partinfo->mime_type) {

                cmd = prefs_common.uri_cmd;

                def_cmd = default_html_cmdline;

        } else {

                g_snprintf(m_buf, sizeof(m_buf), mime_cmdline,

                           partinfo->content_type, "%s");

                cmd = m_buf;

                def_cmd = NULL;

        }

        if (cmd && (p = strchr(cmd, '%')) && *(p + 1) == 's' &&

            !strchr(p + 2, '%'))

                g_snprintf(buf, sizeof(buf), cmd, filename);

        else {

                if (cmd)

                        g_warning(_("MIME viewer command line is invalid: `%s'"), cmd);

                if (def_cmd)

                        g_snprintf(buf, sizeof(buf), def_cmd, filename);

                else

                        return;

        }

        execute_command_line(buf, TRUE);

}

#if USE_GPGME

static void update_node_name(GtkCTree *ctree, GtkCTreeNode *node,

                             gpointer data)

{

        MimeInfo *partinfo;

        gchar *part_name;

        partinfo = gtk_ctree_node_get_row_data(ctree, node);

        g_return_if_fail(partinfo != NULL);

        part_name = get_part_name(partinfo);

        gtk_ctree_node_set_text(ctree, node, COL_NAME, part_name);

}

static void mimeview_update_names(MimeView *mimeview)

{

        GtkCTree *ctree = GTK_CTREE(mimeview->ctree);

        gtk_ctree_pre_recursive(ctree, NULL, update_node_name, NULL);

}

static void mimeview_update_signature_info(MimeView *mimeview)

{

        MimeInfo *partinfo;

        if (!mimeview) return;

        if (!mimeview->opened) return;

        partinfo = mimeview_get_selected_part(mimeview);

        if (!partinfo) return;

        if (g_strcasecmp(partinfo->content_type,

                         "application/pgp-signature") == 0) {

                mimeview_change_view_type(mimeview, MIMEVIEW_TEXT);

                mimeview_show_signature_part(mimeview, partinfo);

        }

}

static void mimeview_check_signature(MimeView *mimeview)

{

        MimeInfo *mimeinfo;

        FILE *fp;

        g_return_if_fail (mimeview_is_signed(mimeview));

        mimeinfo = mimeview_get_selected_part(mimeview);

        g_return_if_fail(mimeinfo != NULL);

        g_return_if_fail(mimeview->file != NULL);

        while (mimeinfo->parent)

                mimeinfo = mimeinfo->parent;

        if ((fp = fopen(mimeview->file, "rb")) == NULL) {

                FILE_OP_ERROR(mimeview->file, "fopen");

                return;

        }

        rfc2015_check_signature(mimeinfo, fp);

        fclose(fp);

        mimeview_update_names(mimeview);

        mimeview_update_signature_info(mimeview);

        textview_show_message(mimeview->messageview->textview, mimeinfo,

                              mimeview->file);

}

#endif /* USE_GPGME */