git.maemo.org Git - modest/blob - src/widgets/modest-gtkhtml-mime-part-view.c

   1 /* Copyright (c) 2006, 2007, Nokia Corporation
   2  * All rights reserved.
   3  *
   4  * Redistribution and use in source and binary forms, with or without
   5  * modification, are permitted provided that the following conditions are
   6  * met:
   7  *
   8  * * Redistributions of source code must retain the above copyright
   9  *   notice, this list of conditions and the following disclaimer.
  10  * * Redistributions in binary form must reproduce the above copyright
  11  *   notice, this list of conditions and the following disclaimer in the
  12  *   documentation and/or other materials provided with the distribution.
  13  * * Neither the name of the Nokia Corporation nor the names of its
  14  *   contributors may be used to endorse or promote products derived from
  15  *   this software without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
  18  * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
  19  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
  20  * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER
  21  * OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  22  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  23  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
  24  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  25  * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  26  * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  27  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  28  */
  29
  30 #include <config.h>
  31 #include <widgets/modest-gtkhtml-mime-part-view.h>
  32 #include <string.h>
  33 #include <gtkhtml/gtkhtml-stream.h>
  34 #include <gtkhtml/gtkhtml-search.h>
  35 #include <tny-stream.h>
  36 #include <tny-mime-part-view.h>
  37 #include "modest-tny-mime-part.h"
  38 #include <modest-stream-text-to-html.h>
  39 #include <modest-text-utils.h>
  40 #include <modest-conf.h>
  41 #include <modest-runtime.h>
  42 #include <widgets/modest-mime-part-view.h>
  43 #include <widgets/modest-zoomable.h>
  44 #include <widgets/modest-tny-stream-gtkhtml.h>
  45 #include <libgnomevfs/gnome-vfs.h>
  46 #include <gdk/gdkkeysyms.h>
  47 #include <modest-ui-constants.h>
  48
  49 /* gobject structure methods */
  50 static void    modest_gtkhtml_mime_part_view_class_init (ModestGtkhtmlMimePartViewClass *klass);
  51 static void    tny_mime_part_view_init                  (gpointer g, gpointer iface_data);
  52 static void    modest_mime_part_view_init               (gpointer g, gpointer iface_data);
  53 static void    modest_zoomable_init                     (gpointer g, gpointer iface_data);
  54 static void    modest_isearch_view_init                 (gpointer g, gpointer iface_data);
  55 static void    modest_gtkhtml_mime_part_view_init       (ModestGtkhtmlMimePartView *self);
  56 static void    modest_gtkhtml_mime_part_view_finalize   (GObject *self);
  57 static void    modest_gtkhtml_mime_part_view_dispose    (GObject *self);
  58
  59 /* GtkHTML signal handlers */
  60 static gboolean  on_link_clicked  (GtkWidget *widget, const gchar *uri, ModestGtkhtmlMimePartView *self);
  61 static gboolean  on_url           (GtkWidget *widget, const gchar *uri, ModestGtkhtmlMimePartView *self);
  62 static gboolean  on_url_requested (GtkWidget *widget, const gchar *uri, GtkHTMLStream *stream,
  63                                    ModestGtkhtmlMimePartView *self);
  64 static void      on_notify_style  (GObject *obj, GParamSpec *spec, gpointer userdata);
  65 static gboolean  update_style     (ModestGtkhtmlMimePartView *self);
  66 /* TnyMimePartView implementation */
  67 static void modest_gtkhtml_mime_part_view_clear (TnyMimePartView *self);
  68 static void modest_gtkhtml_mime_part_view_clear_default (TnyMimePartView *self);
  69 static void modest_gtkhtml_mime_part_view_set_part (TnyMimePartView *self, TnyMimePart *part);
  70 static void modest_gtkhtml_mime_part_view_set_part_default (TnyMimePartView *self, TnyMimePart *part);
  71 static TnyMimePart* modest_gtkhtml_mime_part_view_get_part (TnyMimePartView *self);
  72 static TnyMimePart* modest_gtkhtml_mime_part_view_get_part_default (TnyMimePartView *self);
  73 /* ModestMimePartView implementation */
  74 static gboolean modest_gtkhtml_mime_part_view_is_empty (ModestMimePartView *self);
  75 static gboolean modest_gtkhtml_mime_part_view_is_empty_default (ModestMimePartView *self);
  76 static gboolean modest_gtkhtml_mime_part_view_get_view_images (ModestMimePartView *self);
  77 static gboolean modest_gtkhtml_mime_part_view_get_view_images_default (ModestMimePartView *self);
  78 static void     modest_gtkhtml_mime_part_view_set_view_images (ModestMimePartView *self, gboolean view_images);
  79 static void     modest_gtkhtml_mime_part_view_set_view_images_default (ModestMimePartView *self, gboolean view_images);
  80 static gboolean modest_gtkhtml_mime_part_view_has_external_images (ModestMimePartView *self);
  81 static gboolean modest_gtkhtml_mime_part_view_has_external_images_default (ModestMimePartView *self);
  82 /* ModestZoomable implementation */
  83 static gdouble modest_gtkhtml_mime_part_view_get_zoom (ModestZoomable *self);
  84 static void modest_gtkhtml_mime_part_view_set_zoom (ModestZoomable *self, gdouble value);
  85 static gboolean modest_gtkhtml_mime_part_view_zoom_minus (ModestZoomable *self);
  86 static gboolean modest_gtkhtml_mime_part_view_zoom_plus (ModestZoomable *self);
  87 static gdouble modest_gtkhtml_mime_part_view_get_zoom_default (ModestZoomable *self);
  88 static void modest_gtkhtml_mime_part_view_set_zoom_default (ModestZoomable *self, gdouble value);
  89 static gboolean modest_gtkhtml_mime_part_view_zoom_minus_default (ModestZoomable *self);
  90 static gboolean modest_gtkhtml_mime_part_view_zoom_plus_default (ModestZoomable *self);
  91 /* ModestISearchView implementation */
  92 static gboolean modest_gtkhtml_mime_part_view_search                    (ModestISearchView *self, const gchar *string);
  93 static gboolean modest_gtkhtml_mime_part_view_search_next               (ModestISearchView *self);
  94 static gboolean modest_gtkhtml_mime_part_view_get_selection_area        (ModestISearchView *self, gint *x, gint *y,
  95                                                                          gint *width, gint *height);
  96 static gboolean modest_gtkhtml_mime_part_view_search_default            (ModestISearchView *self, const gchar *string);
  97 static gboolean modest_gtkhtml_mime_part_view_search_next_default       (ModestISearchView *self);
  98 static gboolean modest_gtkhtml_mime_part_view_get_selection_area_default (ModestISearchView *self, gint *x, gint *y,
  99                                                                           gint *width, gint *height);
 100
 101
 102 /* internal api */
 103 static TnyMimePart  *get_part   (ModestGtkhtmlMimePartView *self);
 104 static void          set_html_part   (ModestGtkhtmlMimePartView *self, TnyMimePart *part);
 105 static void          set_text_part   (ModestGtkhtmlMimePartView *self, TnyMimePart *part);
 106 static void          set_empty_part  (ModestGtkhtmlMimePartView *self);
 107 static void          set_part   (ModestGtkhtmlMimePartView *self, TnyMimePart *part);
 108 static gboolean      is_empty   (ModestGtkhtmlMimePartView *self);
 109 static gboolean      get_view_images   (ModestGtkhtmlMimePartView *self);
 110 static void          set_view_images   (ModestGtkhtmlMimePartView *self, gboolean view_images);
 111 static gboolean      has_external_images   (ModestGtkhtmlMimePartView *self);
 112 static void          set_zoom   (ModestGtkhtmlMimePartView *self, gdouble zoom);
 113 static gdouble       get_zoom   (ModestGtkhtmlMimePartView *self);
 114 static gboolean      has_contents_receiver (gpointer engine, const gchar *data,
 115                                             size_t len, gboolean *has_contents);
 116 static gboolean      search             (ModestGtkhtmlMimePartView *self, const gchar *string);
 117 static gboolean      search_next        (ModestGtkhtmlMimePartView *self);
 118 static gboolean      get_selection_area (ModestGtkhtmlMimePartView *self, gint *x, gint *y,
 119                                          gint *width, gint *height);
 120
 121 typedef struct _ModestGtkhtmlMimePartViewPrivate ModestGtkhtmlMimePartViewPrivate;
 122 struct _ModestGtkhtmlMimePartViewPrivate {
 123         TnyMimePart *part;
 124         gdouble current_zoom;
 125         gboolean view_images;
 126         gboolean has_external_images;
 127         GSList *sighandlers;
 128 };
 129
 130 #define MODEST_GTKHTML_MIME_PART_VIEW_GET_PRIVATE(o)      (G_TYPE_INSTANCE_GET_PRIVATE((o), \
 131                                                                                        MODEST_TYPE_GTKHTML_MIME_PART_VIEW, \
 132                                                                                        ModestGtkhtmlMimePartViewPrivate))
 133
 134 enum {
 135         STOP_STREAMS_SIGNAL,
 136         LAST_SIGNAL
 137 };
 138
 139 static GtkHTMLClass *parent_class = NULL;
 140
 141 static guint signals[LAST_SIGNAL] = {0};
 142
 143 GtkWidget *
 144 modest_gtkhtml_mime_part_view_new ()
 145 {
 146         return g_object_new (MODEST_TYPE_GTKHTML_MIME_PART_VIEW, NULL);
 147 }
 148
 149 /* GOBJECT IMPLEMENTATION */
 150 GType
 151 modest_gtkhtml_mime_part_view_get_type (void)
 152 {
 153         static GType my_type = 0;
 154         if (!my_type) {
 155                 static const GTypeInfo my_info = {
 156                         sizeof(ModestGtkhtmlMimePartViewClass),
 157                         NULL,           /* base init */
 158                         NULL,           /* base finalize */
 159                         (GClassInitFunc) modest_gtkhtml_mime_part_view_class_init,
 160                         NULL,           /* class finalize */
 161                         NULL,           /* class data */
 162                         sizeof(ModestGtkhtmlMimePartView),
 163                         1,              /* n_preallocs */
 164                         (GInstanceInitFunc) modest_gtkhtml_mime_part_view_init,
 165                         NULL
 166                 };
 167
 168                 static const GInterfaceInfo tny_mime_part_view_info =
 169                 {
 170                   (GInterfaceInitFunc) tny_mime_part_view_init, /* interface_init */
 171                   NULL,         /* interface_finalize */
 172                   NULL          /* interface_data */
 173                 };
 174
 175                 static const GInterfaceInfo modest_mime_part_view_info =
 176                 {
 177                   (GInterfaceInitFunc) modest_mime_part_view_init, /* interface_init */
 178                   NULL,         /* interface_finalize */
 179                   NULL          /* interface_data */
 180                 };
 181
 182                 static const GInterfaceInfo modest_zoomable_info =
 183                 {
 184                   (GInterfaceInitFunc) modest_zoomable_init, /* interface_init */
 185                   NULL,         /* interface_finalize */
 186                   NULL          /* interface_data */
 187                 };
 188
 189                 static const GInterfaceInfo modest_isearch_view_info =
 190                 {
 191                   (GInterfaceInitFunc) modest_isearch_view_init, /* interface_init */
 192                   NULL,         /* interface_finalize */
 193                   NULL          /* interface_data */
 194                 };
 195
 196                 my_type = g_type_register_static (GTK_TYPE_HTML,
 197                                                   "ModestGtkhtmlMimePartView",
 198                                                   &my_info, 0);
 199
 200                 g_type_add_interface_static (my_type, TNY_TYPE_MIME_PART_VIEW,
 201                         &tny_mime_part_view_info);
 202
 203                 g_type_add_interface_static (my_type, MODEST_TYPE_MIME_PART_VIEW,
 204                         &modest_mime_part_view_info);
 205
 206                 g_type_add_interface_static (my_type, MODEST_TYPE_ZOOMABLE,
 207                         &modest_zoomable_info);
 208                 g_type_add_interface_static (my_type, MODEST_TYPE_ISEARCH_VIEW,
 209                         &modest_isearch_view_info);
 210         }
 211         return my_type;
 212 }
 213
 214 static void
 215 modest_gtkhtml_mime_part_view_class_init (ModestGtkhtmlMimePartViewClass *klass)
 216 {
 217         GObjectClass *gobject_class;
 218         GtkBindingSet *binding_set;
 219
 220         gobject_class = (GObjectClass*) klass;
 221
 222         parent_class            = g_type_class_peek_parent (klass);
 223         gobject_class->dispose = modest_gtkhtml_mime_part_view_dispose;
 224         gobject_class->finalize = modest_gtkhtml_mime_part_view_finalize;
 225
 226         klass->get_part_func = modest_gtkhtml_mime_part_view_get_part_default;
 227         klass->set_part_func = modest_gtkhtml_mime_part_view_set_part_default;
 228         klass->clear_func = modest_gtkhtml_mime_part_view_clear_default;
 229         klass->is_empty_func = modest_gtkhtml_mime_part_view_is_empty_default;
 230         klass->get_view_images_func = modest_gtkhtml_mime_part_view_get_view_images_default;
 231         klass->set_view_images_func = modest_gtkhtml_mime_part_view_set_view_images_default;
 232         klass->has_external_images_func = modest_gtkhtml_mime_part_view_has_external_images_default;
 233         klass->get_zoom_func = modest_gtkhtml_mime_part_view_get_zoom_default;
 234         klass->set_zoom_func = modest_gtkhtml_mime_part_view_set_zoom_default;
 235         klass->zoom_minus_func = modest_gtkhtml_mime_part_view_zoom_minus_default;
 236         klass->zoom_plus_func = modest_gtkhtml_mime_part_view_zoom_plus_default;
 237         klass->search_func = modest_gtkhtml_mime_part_view_search_default;
 238         klass->search_next_func = modest_gtkhtml_mime_part_view_search_next_default;
 239         klass->get_selection_area_func = modest_gtkhtml_mime_part_view_get_selection_area_default;
 240
 241         binding_set = gtk_binding_set_by_class (klass);
 242         gtk_binding_entry_skip (binding_set, GDK_Down, 0);
 243         gtk_binding_entry_skip (binding_set, GDK_Up, 0);
 244         gtk_binding_entry_skip (binding_set, GDK_KP_Up, 0);
 245         gtk_binding_entry_skip (binding_set, GDK_KP_Down, 0);
 246         gtk_binding_entry_skip (binding_set, GDK_Page_Down, 0);
 247         gtk_binding_entry_skip (binding_set, GDK_Page_Up, 0);
 248         gtk_binding_entry_skip (binding_set, GDK_KP_Page_Up, 0);
 249         gtk_binding_entry_skip (binding_set, GDK_KP_Page_Down, 0);
 250         gtk_binding_entry_skip (binding_set, GDK_Home, 0);
 251         gtk_binding_entry_skip (binding_set, GDK_End, 0);
 252         gtk_binding_entry_skip (binding_set, GDK_KP_Home, 0);
 253         gtk_binding_entry_skip (binding_set, GDK_KP_End, 0);
 254
 255         g_type_class_add_private (gobject_class, sizeof(ModestGtkhtmlMimePartViewPrivate));
 256
 257         signals[STOP_STREAMS_SIGNAL] =
 258                 g_signal_new ("stop-streams",
 259                               G_TYPE_FROM_CLASS (gobject_class),
 260                               G_SIGNAL_RUN_FIRST,
 261                               G_STRUCT_OFFSET (ModestGtkhtmlMimePartViewClass,stop_streams),
 262                               NULL, NULL,
 263                               g_cclosure_marshal_VOID__VOID,
 264                               G_TYPE_NONE, 0);
 265
 266 }
 267
 268 static void
 269 modest_gtkhtml_mime_part_view_init (ModestGtkhtmlMimePartView *self)
 270 {
 271         ModestGtkhtmlMimePartViewPrivate *priv = MODEST_GTKHTML_MIME_PART_VIEW_GET_PRIVATE (self);
 272         GdkColor base;
 273         GdkColor text;
 274
 275         gtk_html_set_editable        (GTK_HTML(self), FALSE);
 276         gtk_html_allow_selection     (GTK_HTML(self), TRUE);
 277         gtk_html_set_caret_mode      (GTK_HTML(self), FALSE);
 278         gtk_html_set_blocking        (GTK_HTML(self), TRUE);
 279         gtk_html_set_images_blocking (GTK_HTML(self), TRUE);
 280         gtk_container_set_border_width (GTK_CONTAINER (self), MODEST_MARGIN_DEFAULT);
 281
 282         gdk_color_parse ("#fff", &base);
 283         gdk_color_parse ("#000", &text);
 284         gtk_widget_modify_base (GTK_WIDGET (self), GTK_STATE_NORMAL, &base);
 285         gtk_widget_modify_text (GTK_WIDGET (self), GTK_STATE_NORMAL, &text);
 286
 287         priv->sighandlers = modest_signal_mgr_connect (priv->sighandlers,
 288                                                        G_OBJECT(self), "link_clicked",
 289                                                        G_CALLBACK(on_link_clicked), self);
 290         priv->sighandlers = modest_signal_mgr_connect (priv->sighandlers,
 291                                                        G_OBJECT(self), "url_requested",
 292                                                        G_CALLBACK(on_url_requested), self);
 293         priv->sighandlers = modest_signal_mgr_connect (priv->sighandlers,
 294                                                        G_OBJECT(self), "on_url",
 295                                                        G_CALLBACK(on_url), self);
 296         priv->sighandlers = modest_signal_mgr_connect (priv->sighandlers,
 297                                                        G_OBJECT(self), "notify::style",
 298                                                        G_CALLBACK (on_notify_style), (gpointer) self);
 299
 300         priv->part = NULL;
 301         priv->current_zoom = 1.0;
 302         priv->view_images = FALSE;
 303         priv->has_external_images = FALSE;
 304 }
 305
 306 static void
 307 modest_gtkhtml_mime_part_view_finalize (GObject *obj)
 308 {
 309         ModestGtkhtmlMimePartViewPrivate *priv = MODEST_GTKHTML_MIME_PART_VIEW_GET_PRIVATE (obj);
 310
 311         modest_signal_mgr_disconnect_all_and_destroy (priv->sighandlers);
 312         priv->sighandlers = NULL;
 313
 314         G_OBJECT_CLASS (parent_class)->finalize (obj);
 315 }
 316
 317 static void
 318 modest_gtkhtml_mime_part_view_dispose (GObject *obj)
 319 {
 320         ModestGtkhtmlMimePartViewPrivate *priv = MODEST_GTKHTML_MIME_PART_VIEW_GET_PRIVATE (obj);
 321
 322         g_signal_emit (G_OBJECT (obj), signals[STOP_STREAMS_SIGNAL], 0);
 323
 324         if (priv->part) {
 325                 g_object_unref (priv->part);
 326                 priv->part = NULL;
 327         }
 328
 329         G_OBJECT_CLASS (parent_class)->dispose (obj);
 330 }
 331
 332 /* GTKHTML SIGNALS HANDLERS */
 333
 334 static void
 335 on_notify_style (GObject *obj, GParamSpec *spec, gpointer userdata)
 336 {
 337         if (strcmp ("style", spec->name) == 0) {
 338                 g_idle_add_full (G_PRIORITY_DEFAULT, (GSourceFunc) update_style,
 339                                  g_object_ref (obj), g_object_unref);
 340                 gtk_widget_queue_draw (GTK_WIDGET (obj));
 341         }
 342 }
 343
 344 gboolean
 345 same_color (GdkColor *a, GdkColor *b)
 346 {
 347         return ((a->red == b->red) &&
 348                 (a->green == b->green) &&
 349                 (a->blue == b->blue));
 350 }
 351
 352 static gboolean
 353 update_style (ModestGtkhtmlMimePartView *self)
 354 {
 355         GdkColor base;
 356         GdkColor text;
 357         GtkRcStyle *rc_style;
 358
 359         gdk_threads_enter ();
 360
 361         if (GTK_WIDGET_VISIBLE (self)) {
 362                 rc_style = gtk_widget_get_modifier_style (GTK_WIDGET (self));
 363
 364                 gdk_color_parse ("#fff", &base);
 365                 gdk_color_parse ("#000", &text);
 366
 367                 if (!same_color (&(rc_style->base[GTK_STATE_NORMAL]), &base) &&
 368                     !same_color (&(rc_style->text[GTK_STATE_NORMAL]), &text)) {
 369
 370                         rc_style->base[GTK_STATE_NORMAL] = base;
 371                         rc_style->text[GTK_STATE_NORMAL] = text;
 372                         gtk_widget_modify_style (GTK_WIDGET (self), rc_style);
 373                 }
 374         }
 375
 376         gdk_threads_leave ();
 377
 378         return FALSE;
 379 }
 380
 381
 382
 383 static gboolean
 384 on_link_clicked (GtkWidget *widget, const gchar *uri, ModestGtkhtmlMimePartView *self)
 385 {
 386         gboolean result;
 387         g_return_val_if_fail (MODEST_IS_GTKHTML_MIME_PART_VIEW (self), FALSE);
 388
 389         g_signal_emit_by_name (G_OBJECT (self), "activate-link", uri, &result);
 390         return result;
 391 }
 392
 393 static gboolean
 394 on_url (GtkWidget *widget, const gchar *uri, ModestGtkhtmlMimePartView *self)
 395 {
 396         gboolean result;
 397         g_return_val_if_fail (MODEST_IS_GTKHTML_MIME_PART_VIEW (self), FALSE);
 398
 399         g_signal_emit_by_name (G_OBJECT (self), "link-hover", uri, &result);
 400         return result;
 401 }
 402
 403 typedef struct {
 404         gpointer buffer;
 405         GtkHTML *html;
 406         GtkHTMLStream *stream;
 407 } ImageFetcherInfo;
 408
 409 static gboolean
 410 on_url_requested (GtkWidget *widget, const gchar *uri, GtkHTMLStream *stream,
 411                   ModestGtkhtmlMimePartView *self)
 412 {
 413         gboolean result;
 414         TnyStream *tny_stream;
 415         g_return_val_if_fail (MODEST_IS_GTKHTML_MIME_PART_VIEW (self), FALSE);
 416
 417         if (g_str_has_prefix (uri, "http:")) {
 418                 ModestGtkhtmlMimePartViewPrivate *priv = MODEST_GTKHTML_MIME_PART_VIEW_GET_PRIVATE (self);
 419
 420                 if (!priv->view_images)
 421                         priv->has_external_images = TRUE;
 422         }
 423
 424         tny_stream = TNY_STREAM (modest_tny_stream_gtkhtml_new (stream, GTK_HTML (widget)));
 425         g_signal_emit_by_name (MODEST_MIME_PART_VIEW (self), "fetch-url", uri, tny_stream, &result);
 426         g_object_unref (tny_stream);
 427         return result;
 428 }
 429
 430 /* INTERNAL API */
 431 static void
 432 decode_to_stream_cb (TnyMimePart *self,
 433                      gboolean cancelled,
 434                      TnyStream *stream,
 435                      GError *err,
 436                      gpointer user_data)
 437 {
 438         gboolean is_text = GPOINTER_TO_INT (user_data);
 439
 440         if (is_text) {
 441                 if (tny_stream_write (stream, "\n", 1) == -1) {
 442                         g_warning ("failed to write CR in %s", __FUNCTION__);
 443                 }
 444                 tny_stream_reset (stream);
 445         }
 446         tny_stream_close (stream);
 447 }
 448
 449 static void
 450 set_html_part (ModestGtkhtmlMimePartView *self, TnyMimePart *part)
 451 {
 452         GtkHTMLStream *gtkhtml_stream;
 453         TnyStream *tny_stream;
 454
 455         g_return_if_fail (self);
 456         g_return_if_fail (part);
 457
 458         g_signal_emit (G_OBJECT (self), signals[STOP_STREAMS_SIGNAL], 0);
 459
 460         gtkhtml_stream = gtk_html_begin(GTK_HTML(self));
 461
 462         tny_stream     = TNY_STREAM(modest_tny_stream_gtkhtml_new (gtkhtml_stream, GTK_HTML (self)));
 463         tny_stream_reset (tny_stream);
 464
 465         tny_mime_part_decode_to_stream_async (TNY_MIME_PART (part),
 466                                               tny_stream, decode_to_stream_cb,
 467                                               NULL, GINT_TO_POINTER (FALSE));
 468         g_object_unref (tny_stream);
 469 }
 470
 471 static void
 472 set_text_part (ModestGtkhtmlMimePartView *self, TnyMimePart *part)
 473 {
 474         TnyStream* text_to_html_stream, *tny_stream;
 475         GtkHTMLStream *gtkhtml_stream;
 476
 477         g_return_if_fail (self);
 478         g_return_if_fail (part);
 479
 480         g_signal_emit (G_OBJECT (self), signals[STOP_STREAMS_SIGNAL], 0);
 481
 482         gtkhtml_stream = gtk_html_begin(GTK_HTML(self));
 483         tny_stream =  TNY_STREAM(modest_tny_stream_gtkhtml_new (gtkhtml_stream, GTK_HTML (self)));
 484         text_to_html_stream = TNY_STREAM (modest_stream_text_to_html_new (tny_stream));
 485         modest_stream_text_to_html_set_linkify_limit (MODEST_STREAM_TEXT_TO_HTML (text_to_html_stream),
 486                                                       64*1024);
 487         modest_stream_text_to_html_set_full_limit (MODEST_STREAM_TEXT_TO_HTML (text_to_html_stream),
 488                                                    640*1024);
 489
 490         tny_mime_part_decode_to_stream_async (TNY_MIME_PART (part),
 491                                               text_to_html_stream, decode_to_stream_cb,
 492                                               NULL, GINT_TO_POINTER (TRUE));
 493
 494         g_object_unref (G_OBJECT(text_to_html_stream));
 495         g_object_unref (G_OBJECT(tny_stream));
 496 }
 497
 498 static void
 499 set_empty_part (ModestGtkhtmlMimePartView *self)
 500 {
 501         g_return_if_fail (self);
 502
 503         g_signal_emit (G_OBJECT (self), signals[STOP_STREAMS_SIGNAL], 0);
 504         gtk_html_load_from_string (GTK_HTML(self), "", 1);
 505 }
 506
 507 static void
 508 set_part (ModestGtkhtmlMimePartView *self, TnyMimePart *part)
 509 {
 510         ModestGtkhtmlMimePartViewPrivate *priv;
 511
 512         g_return_if_fail (self);
 513
 514         priv = MODEST_GTKHTML_MIME_PART_VIEW_GET_PRIVATE(self);
 515         priv->has_external_images = FALSE;
 516
 517         if (part != priv->part) {
 518                 if (priv->part)
 519                         g_object_unref (G_OBJECT(priv->part));
 520                 if (part)
 521                         g_object_ref   (G_OBJECT(part));
 522                 priv->part = part;
 523         }
 524
 525         if (!part) {
 526                 set_empty_part (self);
 527                 return;
 528         }
 529
 530         if (tny_mime_part_content_type_is (part, "text/html")) {
 531                 set_html_part (self, part);
 532         } else {
 533                 if (tny_mime_part_content_type_is (part, "message/rfc822")) {
 534                         gchar *header_content_type, *header_content_type_lower;
 535                         header_content_type = modest_tny_mime_part_get_header_value (part, "Content-Type");
 536                         if (header_content_type) {
 537                                 header_content_type = g_strstrip (header_content_type);
 538                                 header_content_type_lower = g_ascii_strdown (header_content_type, -1);
 539
 540                                 if (!g_ascii_strcasecmp (header_content_type_lower, "text/html"))
 541                                         set_html_part (self, part);
 542                                 else
 543                                         set_text_part (self, part);
 544
 545                                 g_free (header_content_type_lower);
 546                                 g_free (header_content_type);
 547                         } else {
 548                                 set_text_part (self, part);
 549                         }
 550                 } else {
 551                         set_text_part (self, part);
 552                 }
 553         }
 554
 555 }
 556
 557 static TnyMimePart*
 558 get_part (ModestGtkhtmlMimePartView *self)
 559 {
 560         TnyMimePart *part;
 561
 562         g_return_val_if_fail (MODEST_IS_GTKHTML_MIME_PART_VIEW (self), NULL);
 563
 564         part = MODEST_GTKHTML_MIME_PART_VIEW_GET_PRIVATE(self)->part;
 565
 566         if (part)
 567                 g_object_ref (part);
 568
 569         return part;
 570 }
 571
 572 static gboolean
 573 has_contents_receiver (gpointer engine, const gchar *data,
 574                        size_t len, gboolean *has_contents)
 575 {
 576         if (len > 1 || ((len == 1)&&(data[0]!='\n'))) {
 577                 *has_contents = TRUE;
 578                 return FALSE;
 579         }
 580         return TRUE;
 581 }
 582
 583 static gboolean
 584 is_empty   (ModestGtkhtmlMimePartView *self)
 585 {
 586         /* TODO: Find some gtkhtml API to check whether there is any (visible, non markup)
 587          * text in the message:
 588          */
 589         gboolean has_contents = FALSE;
 590
 591         gtk_html_export (GTK_HTML (self), "text/plain",
 592                          (GtkHTMLSaveReceiverFn) has_contents_receiver, &has_contents);
 593
 594         return !has_contents;
 595 }
 596
 597 static gboolean
 598 get_view_images   (ModestGtkhtmlMimePartView *self)
 599 {
 600         ModestGtkhtmlMimePartViewPrivate *priv;
 601
 602         g_return_val_if_fail (MODEST_IS_GTKHTML_MIME_PART_VIEW (self), FALSE);
 603
 604         priv = MODEST_GTKHTML_MIME_PART_VIEW_GET_PRIVATE (self);
 605         return priv->view_images;
 606 }
 607
 608 static void
 609 set_view_images   (ModestGtkhtmlMimePartView *self, gboolean view_images)
 610 {
 611         ModestGtkhtmlMimePartViewPrivate *priv;
 612
 613         g_return_if_fail (MODEST_IS_GTKHTML_MIME_PART_VIEW (self));
 614
 615         priv = MODEST_GTKHTML_MIME_PART_VIEW_GET_PRIVATE (self);
 616         priv->view_images = view_images;
 617 }
 618
 619 static gboolean
 620 has_external_images   (ModestGtkhtmlMimePartView *self)
 621 {
 622         ModestGtkhtmlMimePartViewPrivate *priv;
 623
 624         g_return_val_if_fail (MODEST_IS_GTKHTML_MIME_PART_VIEW (self), FALSE);
 625
 626         priv = MODEST_GTKHTML_MIME_PART_VIEW_GET_PRIVATE (self);
 627         return priv->has_external_images;
 628 }
 629
 630 static void
 631 set_zoom (ModestGtkhtmlMimePartView *self, gdouble zoom)
 632 {
 633         ModestGtkhtmlMimePartViewPrivate *priv;
 634
 635         g_return_if_fail (MODEST_IS_GTKHTML_MIME_PART_VIEW (self));
 636
 637         priv = MODEST_GTKHTML_MIME_PART_VIEW_GET_PRIVATE (self);
 638         priv->current_zoom = zoom;
 639         gtk_html_set_magnification (GTK_HTML(self), zoom);
 640
 641         gtk_widget_queue_resize (GTK_WIDGET (self));
 642 }
 643
 644 static gdouble
 645 get_zoom (ModestGtkhtmlMimePartView *self)
 646 {
 647         ModestGtkhtmlMimePartViewPrivate *priv;
 648
 649         g_return_val_if_fail (MODEST_IS_GTKHTML_MIME_PART_VIEW (self), 1.0);
 650
 651         priv = MODEST_GTKHTML_MIME_PART_VIEW_GET_PRIVATE (self);
 652
 653         return priv->current_zoom;
 654 }
 655
 656 static gboolean
 657 search (ModestGtkhtmlMimePartView *self,
 658         const gchar *string)
 659 {
 660         return gtk_html_engine_search (GTK_HTML (self),
 661                                        string,
 662                                        FALSE,   /* case sensitive */
 663                                        TRUE,    /* forward */
 664                                        FALSE);  /* regexp */
 665 }
 666
 667 static gboolean
 668 search_next (ModestGtkhtmlMimePartView *self)
 669 {
 670         return gtk_html_engine_search_next (GTK_HTML (self));
 671 }
 672
 673 static gboolean
 674 get_selection_area (ModestGtkhtmlMimePartView *self,
 675                     gint *x, gint *y,
 676                     gint *width, gint *height)
 677 {
 678 #ifdef HAVE_GTK_HTML_GET_SELECTION_AREA
 679         gtk_html_get_selection_area (GTK_HTML (self), x, y, width, height);
 680         return TRUE;
 681 #else
 682         return FALSE;
 683 #endif
 684 }
 685
 686
 687 /* TNY MIME PART IMPLEMENTATION */
 688
 689 static void
 690 tny_mime_part_view_init (gpointer g, gpointer iface_data)
 691 {
 692         TnyMimePartViewIface *klass = (TnyMimePartViewIface *)g;
 693
 694         klass->get_part = modest_gtkhtml_mime_part_view_get_part;
 695         klass->set_part = modest_gtkhtml_mime_part_view_set_part;
 696         klass->clear = modest_gtkhtml_mime_part_view_clear;
 697
 698         return;
 699 }
 700
 701 static TnyMimePart*
 702 modest_gtkhtml_mime_part_view_get_part (TnyMimePartView *self)
 703 {
 704         return MODEST_GTKHTML_MIME_PART_VIEW_GET_CLASS (self)->get_part_func (self);
 705 }
 706
 707
 708 static TnyMimePart*
 709 modest_gtkhtml_mime_part_view_get_part_default (TnyMimePartView *self)
 710 {
 711         return TNY_MIME_PART (get_part (MODEST_GTKHTML_MIME_PART_VIEW (self)));
 712 }
 713
 714 static void
 715 modest_gtkhtml_mime_part_view_set_part (TnyMimePartView *self,
 716                                         TnyMimePart *part)
 717 {
 718         MODEST_GTKHTML_MIME_PART_VIEW_GET_CLASS (self)->set_part_func (self, part);
 719 }
 720
 721 static void
 722 modest_gtkhtml_mime_part_view_set_part_default (TnyMimePartView *self,
 723                                                 TnyMimePart *part)
 724 {
 725         g_return_if_fail ((part == NULL) || TNY_IS_MIME_PART (part));
 726
 727         set_part (MODEST_GTKHTML_MIME_PART_VIEW (self), part);
 728 }
 729
 730 static void
 731 modest_gtkhtml_mime_part_view_clear (TnyMimePartView *self)
 732 {
 733         MODEST_GTKHTML_MIME_PART_VIEW_GET_CLASS (self)->clear_func (self);
 734 }
 735
 736 static void
 737 modest_gtkhtml_mime_part_view_clear_default (TnyMimePartView *self)
 738 {
 739         set_part (MODEST_GTKHTML_MIME_PART_VIEW (self), NULL);
 740 }
 741
 742 /* MODEST MIME PART VIEW IMPLEMENTATION */
 743
 744 static void
 745 modest_mime_part_view_init (gpointer g, gpointer iface_data)
 746 {
 747         ModestMimePartViewIface *klass = (ModestMimePartViewIface *)g;
 748
 749         klass->is_empty_func = modest_gtkhtml_mime_part_view_is_empty;
 750         klass->get_view_images_func = modest_gtkhtml_mime_part_view_get_view_images;
 751         klass->set_view_images_func = modest_gtkhtml_mime_part_view_set_view_images;
 752         klass->has_external_images_func = modest_gtkhtml_mime_part_view_has_external_images;
 753
 754         return;
 755 }
 756
 757 static gboolean
 758 modest_gtkhtml_mime_part_view_is_empty (ModestMimePartView *self)
 759 {
 760         return MODEST_GTKHTML_MIME_PART_VIEW_GET_CLASS (self)->is_empty_func (self);
 761 }
 762
 763 static gboolean
 764 modest_gtkhtml_mime_part_view_get_view_images (ModestMimePartView *self)
 765 {
 766         return MODEST_GTKHTML_MIME_PART_VIEW_GET_CLASS (self)->get_view_images_func (self);
 767 }
 768
 769 static void
 770 modest_gtkhtml_mime_part_view_set_view_images (ModestMimePartView *self, gboolean view_images)
 771 {
 772         MODEST_GTKHTML_MIME_PART_VIEW_GET_CLASS (self)->set_view_images_func (self, view_images);
 773 }
 774
 775 static gboolean
 776 modest_gtkhtml_mime_part_view_has_external_images (ModestMimePartView *self)
 777 {
 778         return MODEST_GTKHTML_MIME_PART_VIEW_GET_CLASS (self)->has_external_images_func (self);
 779 }
 780
 781 static gboolean
 782 modest_gtkhtml_mime_part_view_is_empty_default (ModestMimePartView *self)
 783 {
 784         return is_empty (MODEST_GTKHTML_MIME_PART_VIEW (self));
 785 }
 786
 787 static gboolean
 788 modest_gtkhtml_mime_part_view_get_view_images_default (ModestMimePartView *self)
 789 {
 790         return get_view_images (MODEST_GTKHTML_MIME_PART_VIEW (self));
 791 }
 792
 793 static void
 794 modest_gtkhtml_mime_part_view_set_view_images_default (ModestMimePartView *self, gboolean view_images)
 795 {
 796         set_view_images (MODEST_GTKHTML_MIME_PART_VIEW (self), view_images);
 797 }
 798
 799 static gboolean
 800 modest_gtkhtml_mime_part_view_has_external_images_default (ModestMimePartView *self)
 801 {
 802         return has_external_images (MODEST_GTKHTML_MIME_PART_VIEW (self));
 803 }
 804
 805
 806 /* MODEST ZOOMABLE IMPLEMENTATION */
 807 static void
 808 modest_zoomable_init (gpointer g, gpointer iface_data)
 809 {
 810         ModestZoomableIface *klass = (ModestZoomableIface *)g;
 811
 812         klass->get_zoom_func = modest_gtkhtml_mime_part_view_get_zoom;
 813         klass->set_zoom_func = modest_gtkhtml_mime_part_view_set_zoom;
 814         klass->zoom_minus_func = modest_gtkhtml_mime_part_view_zoom_minus;
 815         klass->zoom_plus_func = modest_gtkhtml_mime_part_view_zoom_plus;
 816
 817         return;
 818 }
 819
 820 static gdouble
 821 modest_gtkhtml_mime_part_view_get_zoom (ModestZoomable *self)
 822 {
 823         return MODEST_GTKHTML_MIME_PART_VIEW_GET_CLASS (self)->get_zoom_func (self);
 824 }
 825
 826 static gdouble
 827 modest_gtkhtml_mime_part_view_get_zoom_default (ModestZoomable *self)
 828 {
 829         return get_zoom (MODEST_GTKHTML_MIME_PART_VIEW (self));
 830 }
 831
 832 static void
 833 modest_gtkhtml_mime_part_view_set_zoom (ModestZoomable *self, gdouble value)
 834 {
 835         MODEST_GTKHTML_MIME_PART_VIEW_GET_CLASS (self)->set_zoom_func (self, value);
 836 }
 837
 838 static void
 839 modest_gtkhtml_mime_part_view_set_zoom_default (ModestZoomable *self, gdouble value)
 840 {
 841         set_zoom (MODEST_GTKHTML_MIME_PART_VIEW (self), value);
 842 }
 843
 844 static gboolean
 845 modest_gtkhtml_mime_part_view_zoom_minus (ModestZoomable *self)
 846 {
 847         return MODEST_GTKHTML_MIME_PART_VIEW_GET_CLASS (self)->zoom_minus_func (self);
 848 }
 849
 850 static gboolean
 851 modest_gtkhtml_mime_part_view_zoom_minus_default (ModestZoomable *self)
 852 {
 853         /* operation not supported in ModestGtkhtmlMimePartView */
 854         return FALSE;
 855 }
 856
 857 static gboolean
 858 modest_gtkhtml_mime_part_view_zoom_plus (ModestZoomable *self)
 859 {
 860         return MODEST_GTKHTML_MIME_PART_VIEW_GET_CLASS (self)->zoom_plus_func (self);
 861 }
 862
 863 static gboolean
 864 modest_gtkhtml_mime_part_view_zoom_plus_default (ModestZoomable *self)
 865 {
 866         /* operation not supported in ModestGtkhtmlMimePartView */
 867         return FALSE;
 868 }
 869
 870 /* ISEARCH VIEW IMPLEMENTATION */
 871 static void
 872 modest_isearch_view_init (gpointer g, gpointer iface_data)
 873 {
 874         ModestISearchViewIface *klass = (ModestISearchViewIface *)g;
 875
 876         klass->search_func = modest_gtkhtml_mime_part_view_search;
 877         klass->search_next_func = modest_gtkhtml_mime_part_view_search_next;
 878         klass->get_selection_area_func = modest_gtkhtml_mime_part_view_get_selection_area;
 879
 880         return;
 881 }
 882
 883 static gboolean
 884 modest_gtkhtml_mime_part_view_search (ModestISearchView *self, const gchar *string)
 885 {
 886         return MODEST_GTKHTML_MIME_PART_VIEW_GET_CLASS (self)->search_func (self, string);
 887 }
 888
 889 static gboolean
 890 modest_gtkhtml_mime_part_view_search_default (ModestISearchView *self, const gchar *string)
 891 {
 892         return search (MODEST_GTKHTML_MIME_PART_VIEW (self), string);
 893 }
 894
 895 static gboolean
 896 modest_gtkhtml_mime_part_view_search_next(ModestISearchView *self)
 897 {
 898         return MODEST_GTKHTML_MIME_PART_VIEW_GET_CLASS (self)->search_next_func (self);
 899 }
 900
 901 static gboolean
 902 modest_gtkhtml_mime_part_view_search_next_default (ModestISearchView *self)
 903 {
 904         return search_next (MODEST_GTKHTML_MIME_PART_VIEW (self));
 905 }
 906
 907 static gboolean
 908 modest_gtkhtml_mime_part_view_get_selection_area (ModestISearchView *self, gint *x, gint *y,
 909                                                   gint *width, gint *height)
 910 {
 911         return MODEST_GTKHTML_MIME_PART_VIEW_GET_CLASS (self)->get_selection_area_func (self, x, y, width, height);
 912 }
 913
 914 static gboolean
 915 modest_gtkhtml_mime_part_view_get_selection_area_default (ModestISearchView *self, gint *x, gint *y,
 916                                                           gint *width, gint *height)
 917 {
 918         return get_selection_area (MODEST_GTKHTML_MIME_PART_VIEW (self), x, y, width, height);
 919 }