trunk/src/html.c

/*
 * Copyright (C) 2008 Till Harbaum <till@harbaum.org>.
 *
 * This file is part of GPXView.
 *
 * GPXView 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 3 of the License, or
 * (at your option) any later version.
 *
 * GPXView 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 GPXView.  If not, see <http://www.gnu.org/licenses/>.
 */

#include "gpxview.h"

typedef struct load_context {
  int active;
  GMutex *mutex;
  GtkWidget *view;
  char *url, *path;
  GtkHTMLStream *stream;
  struct load_context *next;
} load_context_t;

typedef struct {
  appdata_t *appdata;
  cache_t *cache;
  GtkWidget *view;
  load_context_t *load_context;
} http_context_t;

static unsigned long name_hash(const char *name) {
  unsigned long val = 0;

  while(*name) {
    val = (val<<8) ^ (val >> 24) ^ (*name & 0xff);
    name++;
  }

  return val;
}

void release_load_context(GThread *self, load_context_t *context) {
  /* this must be atomar, so acquire a lock */

  printf("%p: freeing context at %p\n", self, context);

  g_mutex_lock(context->mutex);

  /* don't do much if the other thread still uses this */
  if(context->active) {
    printf("  still active -> just close link\n");

    /* close link to view as the thread is either done or */
    /* main wants to close the view */
    gtk_html_end(GTK_HTML(context->view), context->stream, 
                 GTK_HTML_STREAM_OK);

    context->active = FALSE;
    g_mutex_unlock(context->mutex);
    return;
  }

  /* ok, other thread is also gone -> we can destroy everything */
  printf("  not active -> destroy\n");

  /* just free everything */
  g_mutex_unlock(context->mutex);
  free(context->url);
  free(context->path);
  free(context);
}

gpointer loader_thread(gpointer data) {
  GThread *self = g_thread_self();

  GnomeVFSResult result;
  GnomeVFSHandle *handle;
  char buffer[4096];
  GnomeVFSFileSize bytes_read;

  load_context_t *context = (load_context_t*)data;

  printf("%p: loader thread for %s running\n", self, context->url);

  result = gnome_vfs_open(&handle, context->url, GNOME_VFS_OPEN_READ);
  if(result != GNOME_VFS_OK) {
    g_print("%p: open error: %s\n", self, gnome_vfs_result_to_string(result));

    release_load_context(self, context);
    return NULL;
  }
  
  /* try to open file for writing */
  FILE *f = fopen(context->path, "wb");
  int running = TRUE;
  
  do {
    result = gnome_vfs_read(handle, buffer, sizeof(buffer)-1, &bytes_read);
    if((result == GNOME_VFS_OK) && (bytes_read > 0)) {

      /* update local "running" variable from shared variable */
      if(running) {
        g_mutex_lock(context->mutex);
        running = context->active;
        g_mutex_unlock(context->mutex);
      }

      if(running) 
        gtk_html_write(GTK_HTML(context->view), 
                       context->stream, buffer, bytes_read);
      
      /* and also write local file */
      if(f) fwrite(buffer, 1l, bytes_read, f);
    }
  } while((result == GNOME_VFS_OK) && (bytes_read > 0) && running);
  
  if(f) fclose(f);

  gnome_vfs_close(handle);

  /* this file is likely incomplete, remove it */
  if(!running) {
    printf("%p: thread killed, removing imcomplete cached image\n", self);
    remove(context->path);
    release_load_context(self, context);
    return NULL;
  }

  printf("%p: loader thread successfully finished\n", self);
  release_load_context(self, context);
  return NULL;
}

static void on_request_url(GtkHTML *html, const gchar *url, 
                           GtkHTMLStream *stream, gpointer data) {
  char buffer[4096];
  GnomeVFSFileSize bytes_read;
  
  http_context_t *context = (http_context_t*)data;

  if(context->cache) {
    /* try to build local path */
    char *path = malloc(strlen(context->appdata->image_path)+
                        strlen(context->cache->id)+
                        14);  /* strlen("/xxxxxxxx.xxx\0") == 14 */

    strcpy(path, context->appdata->image_path);
    strcat(path, context->cache->id);
    sprintf(path+strlen(path), "/%lx", name_hash(url));

    /* only append extension if there's a useful one up to three chars ... */
    char *dot = strrchr(url, '.');
    if(dot) 
      if(strlen(dot) <= 4)
        strcat(path, dot);
    
    printf("cache name = %s\n", path);
    if(g_file_test(path, G_FILE_TEST_EXISTS)) {
      printf("image file exists!\n");
      
      FILE *f = fopen(path, "rb");
      
      while ((bytes_read = fread(buffer, 1, sizeof(buffer), f)) != 0) {

        gtk_html_write(GTK_HTML(context->view), 
                       stream, buffer, bytes_read);

        while (gtk_events_pending ())
          gtk_main_iteration ();
      }
      fclose(f);
      
    } else {
      if(context->appdata->load_images) {
        printf("image file doesn't exist, starting extra thread!\n");
        
        checkdir(path); 

        /* walk to end of list */
        load_context_t **load_context = &(context->load_context);
        while(*load_context) 
          load_context = &(*load_context)->next;

        *load_context = g_new0(load_context_t, 1);

        (*load_context)->url = strdup(url);
        (*load_context)->path = strdup(path);
        (*load_context)->view = context->view;
        (*load_context)->stream = stream;
        (*load_context)->next = NULL;
        (*load_context)->active = TRUE;
        (*load_context)->mutex = g_mutex_new();
        
        g_thread_create(loader_thread, *load_context, TRUE, NULL);
        return;
      } else
        g_print("Image loading disabled\n");
    }
  } else {
    /* not a cache, maybe help, so load images from icon directory */

    /* try to build local path */
    char *path = malloc(strlen(ICONPATH)+strlen(url)+1);

    strcpy(path, ICONPATH);
    strcat(path, url);
    if(!g_file_test(path, G_FILE_TEST_EXISTS)) {
      strcpy(path, "./icons/");
      strcat(path, url);
    }

    if(g_file_test(path, G_FILE_TEST_EXISTS)) {
      FILE *f = fopen(path, "rb");
      
      while ((bytes_read = fread(buffer, 1, sizeof(buffer), f)) != 0) {
        gtk_html_write(GTK_HTML(context->view), 
                       stream, buffer, bytes_read);
        
        while (gtk_events_pending ())
          gtk_main_iteration ();
      }
      fclose(f);
    }
  }

  gtk_html_end(GTK_HTML(context->view), stream, GTK_HTML_STREAM_OK);
}

/* notify all open html views of zoom event */
void html_zoom(appdata_t *appdata, gboolean in) {
  struct html_view *html_view = appdata->html_view;

  while(html_view) {
    printf("zoom notify view %p\n", html_view->view);

    if(in) gtk_html_zoom_in(GTK_HTML(html_view->view));
    else   gtk_html_zoom_out(GTK_HTML(html_view->view));

    html_view = html_view->next;
  }
}

#ifndef NO_COPY_N_PASTE
static void on_destroy_textview(GtkWidget *widget, gpointer data) {
  appdata_t *appdata = (appdata_t*)data;
  int destroy_active = FALSE;

  /* only do this if main windows hasn't already been destroyed */
  if(!appdata->window) {
    printf("detroy_textview: main window is gone\n");
    return;
  }

  if(!appdata->active_buffer)
    printf("Destroy, but there was no active buffer!\n");
  else {
    if(GTK_WIDGET_TYPE(widget) == GTK_TYPE_TEXT_VIEW) {
      printf("destroying textview\n");
      
      if(appdata->active_buffer == 
         gtk_text_view_get_buffer(GTK_TEXT_VIEW(widget))) {
        printf("This was the active buffer\n");
        destroy_active = TRUE;
      }
    } else {
      if(widget == (GtkWidget*)appdata->active_buffer) {
        printf("This was the active html view\n");
        destroy_active = TRUE;
      }
    }
  }

  if(destroy_active) {
    appdata->active_buffer = NULL;

    gtk_widget_set_sensitive(appdata->menu_cut, FALSE);
    gtk_widget_set_sensitive(appdata->menu_copy, FALSE);
    gtk_widget_set_sensitive(appdata->menu_paste, FALSE);
  }
}
#endif

static void on_destroy_htmlview(GtkWidget *widget, gpointer data) {
  http_context_t *context = (http_context_t*)data;

  printf("destroying html context\n");
  //  printf("associated view = %p\n", context->view);

  struct html_view **h = &(context->appdata->html_view);

  while(*h && (*h)->view != context->view) 
    h = &((*h)->next);

  g_assert(h);

  /* remove entry from chain */
  void *tmp = *h;
  *h = (*h)->next;
  free(tmp);

  load_context_t *load_context = context->load_context;
  while(load_context) {
    printf("found an associated thread\n");

    load_context_t *tmp_context = load_context->next;
    release_load_context(NULL, load_context);
    load_context = tmp_context;
  }

#ifndef NO_COPY_N_PASTE
  on_destroy_textview(widget, context->appdata);
#endif

  /* destroy context */
  free(data);
}

#ifndef NO_COPY_N_PASTE
static gboolean focus_in(GtkWidget *widget, GdkEventFocus *event,
                         gpointer data) {
  appdata_t *appdata = (appdata_t*)data;

  printf("focus in!\n");
 
  /* these buffers are read-only, thus only "copy" is enabled */
  gtk_widget_set_sensitive(appdata->menu_cut, FALSE);
  gtk_widget_set_sensitive(appdata->menu_copy, TRUE);
  gtk_widget_set_sensitive(appdata->menu_paste, FALSE);

  if(GTK_WIDGET_TYPE(widget) == GTK_TYPE_TEXT_VIEW) {
    appdata->active_buffer = gtk_text_view_get_buffer(GTK_TEXT_VIEW(widget));
  } else if(GTK_WIDGET_TYPE(widget) == gtk_html_get_type()) {
    appdata->active_buffer = (GtkTextBuffer*)widget;
  } else {
    printf("not a text nor a html view\n");
  }

  return FALSE;
}

void html_copy_to_clipboard(appdata_t *appdata) {
  gtk_html_copy(GTK_HTML(appdata->active_buffer));
}
#endif

/* panning a gtkhtml view currently doesn't work well */
#define PANNABLE_HTML

#ifdef PANNABLE_HTML
/* eat the button events */
static gboolean on_button_press(GtkWidget *widget, GdkEventButton *event,
                                gpointer user_data) {
  return TRUE;
}
#endif

/* the cache descriptions are not valid html and need some surrounding stuff */
static const char *html_start = "<html><head>"
  "<meta http-equiv=content-type content=\"text/html; charset=UTF-8\">"
  "</head></body>";
static const char *html_end = "</body></html>";

GtkWidget *html_view(appdata_t *appdata, char *text, 
                     gboolean is_html, gboolean scrollwin,
                     cache_t *cache, char *anchor) {
  GtkWidget *view;

  if(is_html) {
    http_context_t *context = g_new0(http_context_t, 1);
    context->appdata = appdata;
    context->cache = cache;

    context->view = view = gtk_html_new();

    /* create a callback to load images only if a cache has been given */
    /* so that images can be cached/stored appropriately */
    g_signal_connect(G_OBJECT(view), "url_requested", 
                     G_CALLBACK(on_request_url), context);

    GtkHTMLStream *stream = gtk_html_begin(GTK_HTML(view));

    gtk_html_write(GTK_HTML(view), stream, html_start, strlen(html_start));
    gtk_html_write(GTK_HTML(view), stream, text, strlen(text));
    gtk_html_write(GTK_HTML(view), stream, html_end, strlen(html_end));
    gtk_html_end(GTK_HTML(view), stream, GTK_HTML_STREAM_OK);

    if(anchor) {
      while(gtk_events_pending())
        gtk_main_iteration ();

      gtk_html_jump_to_anchor(GTK_HTML(context->view), anchor);
    }

    /* register this html view */
    struct html_view **h = &(appdata->html_view);
    while(*h) h = &((*h)->next);
    *h = g_new0(struct html_view, 1);
    (*h)->view = view;

#ifdef PANNABLE_HTML
    /* this causes finger scrolling to work nicely but also prevents */
    /* copy'n paste from working correctly */
    gtk_widget_set_sensitive(GTK_WIDGET(view), FALSE);

    g_signal_connect(G_OBJECT(view), "button-press-event", 
                     G_CALLBACK(on_button_press), NULL);
#endif

    g_signal_connect(G_OBJECT(view), "destroy", 
                     G_CALLBACK(on_destroy_htmlview), context);
  } else {
    GtkTextBuffer *buffer = gtk_text_buffer_new(NULL);
    gtk_text_buffer_set_text(buffer, text, strlen(text));

#ifndef USE_HILDON_TEXT_VIEW
    view = gtk_text_view_new_with_buffer(buffer);
#else
    view = hildon_text_view_new();
    hildon_text_view_set_buffer(HILDON_TEXT_VIEW(view), buffer);
#endif

    gtk_text_view_set_wrap_mode(GTK_TEXT_VIEW(view), GTK_WRAP_WORD);
    gtk_text_view_set_editable(GTK_TEXT_VIEW(view), FALSE);
    gtk_text_view_set_cursor_visible(GTK_TEXT_VIEW(view), FALSE);

#ifndef NO_COPY_N_PASTE
    g_signal_connect(G_OBJECT(view), "destroy", 
                     G_CALLBACK(on_destroy_textview), appdata);
#endif
  } 
  
#ifndef NO_COPY_N_PASTE
  g_signal_connect(G_OBJECT(view), "focus-in-event", 
                   G_CALLBACK(focus_in), appdata);
#endif

  if(scrollwin) {
#ifndef USE_PANNABLE_AREA
    GtkWidget *scrolled_window = gtk_scrolled_window_new(NULL, NULL);
    gtk_scrolled_window_set_policy(GTK_SCROLLED_WINDOW (scrolled_window), 
                     GTK_POLICY_AUTOMATIC, GTK_POLICY_AUTOMATIC);
    gtk_container_add(GTK_CONTAINER(scrolled_window), view);

#if 1
    return scrolled_window;
#else
    GtkWidget *fixed = gtk_fixed_new();
    gtk_fixed_put(GTK_FIXED(fixed), scrolled_window, 0, 0);
    GtkWidget *tbutton = gtk_toggle_button_new_with_label("sel");
    gtk_fixed_put(GTK_FIXED(fixed), tbutton, 0, 0);
    return fixed;
#endif
#else
#ifndef PANNABLE_HTML
  if(is_html) { 
      GtkWidget *scrolled_window = gtk_scrolled_window_new(NULL, NULL);
      gtk_scrolled_window_set_policy(GTK_SCROLLED_WINDOW (scrolled_window), 
                     GTK_POLICY_AUTOMATIC, GTK_POLICY_AUTOMATIC);
      gtk_container_add(GTK_CONTAINER(scrolled_window), view);
      return scrolled_window;
    } else
#endif
    {
      GtkWidget *pannable_area = hildon_pannable_area_new();
      gtk_container_add(GTK_CONTAINER(pannable_area), view);
      return pannable_area;    
    }
#endif
  }

  return view;
}

1	/*
2	* Copyright (C) 2008 Till Harbaum <till@harbaum.org>.
3	*
4	* This file is part of GPXView.
5	*
6	* GPXView is free software: you can redistribute it and/or modify
7	* it under the terms of the GNU General Public License as published by
8	* the Free Software Foundation, either version 3 of the License, or
9	* (at your option) any later version.
10	*
11	* GPXView is distributed in the hope that it will be useful,
12	* but WITHOUT ANY WARRANTY; without even the implied warranty of
13	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14	* GNU General Public License for more details.
15	*
16	* You should have received a copy of the GNU General Public License
17	* along with GPXView. If not, see <http://www.gnu.org/licenses/>.
18	*/
19
20	#include "gpxview.h"
21
22	typedef struct load_context {
23	int active;
24	GMutex *mutex;
25	GtkWidget *view;
26	char url, path;
27	GtkHTMLStream *stream;
28	struct load_context *next;
29	} load_context_t;
30
31	typedef struct {
32	appdata_t *appdata;
33	cache_t *cache;
34	GtkWidget *view;
35	load_context_t *load_context;
36	} http_context_t;
37
38	static unsigned long name_hash(const char *name) {
39	unsigned long val = 0;
40
41	while(*name) {
42	val = (val<<8) ^ (val >> 24) ^ (*name & 0xff);
43	name++;
44	}
45
46	return val;
47	}
48
49	void release_load_context(GThread self, load_context_t context) {
50	/* this must be atomar, so acquire a lock */
51
52	printf("%p: freeing context at %p\n", self, context);
53
54	g_mutex_lock(context->mutex);
55
56	/* don't do much if the other thread still uses this */
57	if(context->active) {
58	printf(" still active -> just close link\n");
59
60	/* close link to view as the thread is either done or */
61	/* main wants to close the view */
62	gtk_html_end(GTK_HTML(context->view), context->stream,
63	GTK_HTML_STREAM_OK);
64
65	context->active = FALSE;
66	g_mutex_unlock(context->mutex);
67	return;
68	}
69
70	/* ok, other thread is also gone -> we can destroy everything */
71	printf(" not active -> destroy\n");
72
73	/* just free everything */
74	g_mutex_unlock(context->mutex);
75	free(context->url);
76	free(context->path);
77	free(context);
78	}
79
80	gpointer loader_thread(gpointer data) {
81	GThread *self = g_thread_self();
82
83	GnomeVFSResult result;
84	GnomeVFSHandle *handle;
85	char buffer[4096];
86	GnomeVFSFileSize bytes_read;
87
88	load_context_t context = (load_context_t)data;
89
90	printf("%p: loader thread for %s running\n", self, context->url);
91
92	result = gnome_vfs_open(&handle, context->url, GNOME_VFS_OPEN_READ);
93	if(result != GNOME_VFS_OK) {
94	g_print("%p: open error: %s\n", self, gnome_vfs_result_to_string(result));
95
96	release_load_context(self, context);
97	return NULL;
98	}
99
100	/* try to open file for writing */
101	FILE *f = fopen(context->path, "wb");
102	int running = TRUE;
103
104	do {
105	result = gnome_vfs_read(handle, buffer, sizeof(buffer)-1, &bytes_read);
106	if((result == GNOME_VFS_OK) && (bytes_read > 0)) {
107
108	/* update local "running" variable from shared variable */
109	if(running) {
110	g_mutex_lock(context->mutex);
111	running = context->active;
112	g_mutex_unlock(context->mutex);
113	}
114
115	if(running)
116	gtk_html_write(GTK_HTML(context->view),
117	context->stream, buffer, bytes_read);
118
119	/* and also write local file */
120	if(f) fwrite(buffer, 1l, bytes_read, f);
121	}
122	} while((result == GNOME_VFS_OK) && (bytes_read > 0) && running);
123
124	if(f) fclose(f);
125
126	gnome_vfs_close(handle);
127
128	/* this file is likely incomplete, remove it */
129	if(!running) {
130	printf("%p: thread killed, removing imcomplete cached image\n", self);
131	remove(context->path);
132	release_load_context(self, context);
133	return NULL;
134	}
135
136	printf("%p: loader thread successfully finished\n", self);
137	release_load_context(self, context);
138	return NULL;
139	}
140
141	static void on_request_url(GtkHTML html, const gchar url,
142	GtkHTMLStream *stream, gpointer data) {
143	char buffer[4096];
144	GnomeVFSFileSize bytes_read;
145
146	http_context_t context = (http_context_t)data;
147
148	if(context->cache) {
149	/* try to build local path */
150	char *path = malloc(strlen(context->appdata->image_path)+
151	strlen(context->cache->id)+
152	14); /* strlen("/xxxxxxxx.xxx\0") == 14 */
153
154	strcpy(path, context->appdata->image_path);
155	strcat(path, context->cache->id);
156	sprintf(path+strlen(path), "/%lx", name_hash(url));
157
158	/* only append extension if there's a useful one up to three chars ... */
159	char *dot = strrchr(url, '.');
160	if(dot)
161	if(strlen(dot) <= 4)
162	strcat(path, dot);
163
164	printf("cache name = %s\n", path);
165	if(g_file_test(path, G_FILE_TEST_EXISTS)) {
166	printf("image file exists!\n");
167
168	FILE *f = fopen(path, "rb");
169
170	while ((bytes_read = fread(buffer, 1, sizeof(buffer), f)) != 0) {
171
172	gtk_html_write(GTK_HTML(context->view),
173	stream, buffer, bytes_read);
174
175	while (gtk_events_pending ())
176	gtk_main_iteration ();
177	}
178	fclose(f);
179
180	} else {
181	if(context->appdata->load_images) {
182	printf("image file doesn't exist, starting extra thread!\n");
183
184	checkdir(path);
185
186	/* walk to end of list */
187	load_context_t **load_context = &(context->load_context);
188	while(*load_context)
189	load_context = &(*load_context)->next;
190
191	*load_context = g_new0(load_context_t, 1);
192
193	(*load_context)->url = strdup(url);
194	(*load_context)->path = strdup(path);
195	(*load_context)->view = context->view;
196	(*load_context)->stream = stream;
197	(*load_context)->next = NULL;
198	(*load_context)->active = TRUE;
199	(*load_context)->mutex = g_mutex_new();
200
201	g_thread_create(loader_thread, *load_context, TRUE, NULL);
202	return;
203	} else
204	g_print("Image loading disabled\n");
205	}
206	} else {
207	/* not a cache, maybe help, so load images from icon directory */
208
209	/* try to build local path */
210	char *path = malloc(strlen(ICONPATH)+strlen(url)+1);
211
212	strcpy(path, ICONPATH);
213	strcat(path, url);
214	if(!g_file_test(path, G_FILE_TEST_EXISTS)) {
215	strcpy(path, "./icons/");
216	strcat(path, url);
217	}
218
219	if(g_file_test(path, G_FILE_TEST_EXISTS)) {
220	FILE *f = fopen(path, "rb");
221
222	while ((bytes_read = fread(buffer, 1, sizeof(buffer), f)) != 0) {
223	gtk_html_write(GTK_HTML(context->view),
224	stream, buffer, bytes_read);
225
226	while (gtk_events_pending ())
227	gtk_main_iteration ();
228	}
229	fclose(f);
230	}
231	}
232
233	gtk_html_end(GTK_HTML(context->view), stream, GTK_HTML_STREAM_OK);
234	}
235
236	/* notify all open html views of zoom event */
237	void html_zoom(appdata_t *appdata, gboolean in) {
238	struct html_view *html_view = appdata->html_view;
239
240	while(html_view) {
241	printf("zoom notify view %p\n", html_view->view);
242
243	if(in) gtk_html_zoom_in(GTK_HTML(html_view->view));
244	else gtk_html_zoom_out(GTK_HTML(html_view->view));
245
246	html_view = html_view->next;
247	}
248	}
249
250	#ifndef NO_COPY_N_PASTE
251	static void on_destroy_textview(GtkWidget *widget, gpointer data) {
252	appdata_t appdata = (appdata_t)data;
253	int destroy_active = FALSE;
254
255	/* only do this if main windows hasn't already been destroyed */
256	if(!appdata->window) {
257	printf("detroy_textview: main window is gone\n");
258	return;
259	}
260
261	if(!appdata->active_buffer)
262	printf("Destroy, but there was no active buffer!\n");
263	else {
264	if(GTK_WIDGET_TYPE(widget) == GTK_TYPE_TEXT_VIEW) {
265	printf("destroying textview\n");
266
267	if(appdata->active_buffer ==
268	gtk_text_view_get_buffer(GTK_TEXT_VIEW(widget))) {
269	printf("This was the active buffer\n");
270	destroy_active = TRUE;
271	}
272	} else {
273	if(widget == (GtkWidget*)appdata->active_buffer) {
274	printf("This was the active html view\n");
275	destroy_active = TRUE;
276	}
277	}
278	}
279
280	if(destroy_active) {
281	appdata->active_buffer = NULL;
282
283	gtk_widget_set_sensitive(appdata->menu_cut, FALSE);
284	gtk_widget_set_sensitive(appdata->menu_copy, FALSE);
285	gtk_widget_set_sensitive(appdata->menu_paste, FALSE);
286	}
287	}
288	#endif
289
290	static void on_destroy_htmlview(GtkWidget *widget, gpointer data) {
291	http_context_t context = (http_context_t)data;
292
293	printf("destroying html context\n");
294	// printf("associated view = %p\n", context->view);
295
296	struct html_view **h = &(context->appdata->html_view);
297
298	while(h && (h)->view != context->view)
299	h = &((*h)->next);
300
301	g_assert(h);
302
303	/* remove entry from chain */
304	void tmp = h;
305	h = (h)->next;
306	free(tmp);
307
308	load_context_t *load_context = context->load_context;
309	while(load_context) {
310	printf("found an associated thread\n");
311
312	load_context_t *tmp_context = load_context->next;
313	release_load_context(NULL, load_context);
314	load_context = tmp_context;
315	}
316
317	#ifndef NO_COPY_N_PASTE
318	on_destroy_textview(widget, context->appdata);
319	#endif
320
321	/* destroy context */
322	free(data);
323	}
324
325	#ifndef NO_COPY_N_PASTE
326	static gboolean focus_in(GtkWidget widget, GdkEventFocus event,
327	gpointer data) {
328	appdata_t appdata = (appdata_t)data;
329
330	printf("focus in!\n");
331
332	/* these buffers are read-only, thus only "copy" is enabled */
333	gtk_widget_set_sensitive(appdata->menu_cut, FALSE);
334	gtk_widget_set_sensitive(appdata->menu_copy, TRUE);
335	gtk_widget_set_sensitive(appdata->menu_paste, FALSE);
336
337	if(GTK_WIDGET_TYPE(widget) == GTK_TYPE_TEXT_VIEW) {
338	appdata->active_buffer = gtk_text_view_get_buffer(GTK_TEXT_VIEW(widget));
339	} else if(GTK_WIDGET_TYPE(widget) == gtk_html_get_type()) {
340	appdata->active_buffer = (GtkTextBuffer*)widget;
341	} else {
342	printf("not a text nor a html view\n");
343	}
344
345	return FALSE;
346	}
347
348	void html_copy_to_clipboard(appdata_t *appdata) {
349	gtk_html_copy(GTK_HTML(appdata->active_buffer));
350	}
351	#endif
352
353	/* panning a gtkhtml view currently doesn't work well */
354	#define PANNABLE_HTML
355
356	#ifdef PANNABLE_HTML
357	/* eat the button events */
358	static gboolean on_button_press(GtkWidget widget, GdkEventButton event,
359	gpointer user_data) {
360	return TRUE;
361	}
362	#endif
363
364	/* the cache descriptions are not valid html and need some surrounding stuff */
365	static const char *html_start = "<html><head>"
366	"<meta http-equiv=content-type content=\"text/html; charset=UTF-8\">"
367	"</head></body>";
368	static const char *html_end = "</body></html>";
369
370	GtkWidget html_view(appdata_t appdata, char *text,
371	gboolean is_html, gboolean scrollwin,
372	cache_t cache, char anchor) {
373	GtkWidget *view;
374
375	if(is_html) {
376	http_context_t *context = g_new0(http_context_t, 1);
377	context->appdata = appdata;
378	context->cache = cache;
379
380	context->view = view = gtk_html_new();
381
382	/* create a callback to load images only if a cache has been given */
383	/* so that images can be cached/stored appropriately */
384	g_signal_connect(G_OBJECT(view), "url_requested",
385	G_CALLBACK(on_request_url), context);
386
387	GtkHTMLStream *stream = gtk_html_begin(GTK_HTML(view));
388
389	gtk_html_write(GTK_HTML(view), stream, html_start, strlen(html_start));
390	gtk_html_write(GTK_HTML(view), stream, text, strlen(text));
391	gtk_html_write(GTK_HTML(view), stream, html_end, strlen(html_end));
392	gtk_html_end(GTK_HTML(view), stream, GTK_HTML_STREAM_OK);
393
394	if(anchor) {
395	while(gtk_events_pending())
396	gtk_main_iteration ();
397
398	gtk_html_jump_to_anchor(GTK_HTML(context->view), anchor);
399	}
400
401	/* register this html view */
402	struct html_view **h = &(appdata->html_view);
403	while(h) h = &((h)->next);
404	*h = g_new0(struct html_view, 1);
405	(*h)->view = view;
406
407	#ifdef PANNABLE_HTML
408	/* this causes finger scrolling to work nicely but also prevents */
409	/* copy'n paste from working correctly */
410	gtk_widget_set_sensitive(GTK_WIDGET(view), FALSE);
411
412	g_signal_connect(G_OBJECT(view), "button-press-event",
413	G_CALLBACK(on_button_press), NULL);
414	#endif
415
416	g_signal_connect(G_OBJECT(view), "destroy",
417	G_CALLBACK(on_destroy_htmlview), context);
418	} else {
419	GtkTextBuffer *buffer = gtk_text_buffer_new(NULL);
420	gtk_text_buffer_set_text(buffer, text, strlen(text));
421
422	#ifndef USE_HILDON_TEXT_VIEW
423	view = gtk_text_view_new_with_buffer(buffer);
424	#else
425	view = hildon_text_view_new();
426	hildon_text_view_set_buffer(HILDON_TEXT_VIEW(view), buffer);
427	#endif
428
429	gtk_text_view_set_wrap_mode(GTK_TEXT_VIEW(view), GTK_WRAP_WORD);
430	gtk_text_view_set_editable(GTK_TEXT_VIEW(view), FALSE);
431	gtk_text_view_set_cursor_visible(GTK_TEXT_VIEW(view), FALSE);
432
433	#ifndef NO_COPY_N_PASTE
434	g_signal_connect(G_OBJECT(view), "destroy",
435	G_CALLBACK(on_destroy_textview), appdata);
436	#endif
437	}
438
439	#ifndef NO_COPY_N_PASTE
440	g_signal_connect(G_OBJECT(view), "focus-in-event",
441	G_CALLBACK(focus_in), appdata);
442	#endif
443
444	if(scrollwin) {
445	#ifndef USE_PANNABLE_AREA
446	GtkWidget *scrolled_window = gtk_scrolled_window_new(NULL, NULL);
447	gtk_scrolled_window_set_policy(GTK_SCROLLED_WINDOW (scrolled_window),
448	GTK_POLICY_AUTOMATIC, GTK_POLICY_AUTOMATIC);
449	gtk_container_add(GTK_CONTAINER(scrolled_window), view);
450
451	#if 1
452	return scrolled_window;
453	#else
454	GtkWidget *fixed = gtk_fixed_new();
455	gtk_fixed_put(GTK_FIXED(fixed), scrolled_window, 0, 0);
456	GtkWidget *tbutton = gtk_toggle_button_new_with_label("sel");
457	gtk_fixed_put(GTK_FIXED(fixed), tbutton, 0, 0);
458	return fixed;
459	#endif
460	#else
461	#ifndef PANNABLE_HTML
462	if(is_html) {
463	GtkWidget *scrolled_window = gtk_scrolled_window_new(NULL, NULL);
464	gtk_scrolled_window_set_policy(GTK_SCROLLED_WINDOW (scrolled_window),
465	GTK_POLICY_AUTOMATIC, GTK_POLICY_AUTOMATIC);
466	gtk_container_add(GTK_CONTAINER(scrolled_window), view);
467	return scrolled_window;
468	} else
469	#endif
470	{
471	GtkWidget *pannable_area = hildon_pannable_area_new();
472	gtk_container_add(GTK_CONTAINER(pannable_area), view);
473	return pannable_area;
474	}
475	#endif
476	}
477
478	return view;
479	}
480