ROX-Filer/src/gui_support.c

   1 /*
   2  * $Id$
   3  *
   4  * ROX-Filer, filer for the ROX desktop project
   5  * Copyright (C) 2000, Thomas Leonard, <tal197@ecs.soton.ac.uk>.
   6  *
   7  * This program is free software; you can redistribute it and/or modify it
   8  * under the terms of the GNU General Public License as published by the Free
   9  * Software Foundation; either version 2 of the License, or (at your option)
  10  * any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful, but WITHOUT
  13  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  14  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  15  * more details.
  16  *
  17  * You should have received a copy of the GNU General Public License along with
  18  * this program; if not, write to the Free Software Foundation, Inc., 59 Temple
  19  * Place, Suite 330, Boston, MA  02111-1307  USA
  20  */
  21
  22 /* gui_support.c - general (GUI) support routines */
  23
  24 #include "config.h"
  25
  26 #include <stdio.h>
  27 #include <stdlib.h>
  28 #include <string.h>
  29 #include <sys/param.h>
  30 #include <stdarg.h>
  31 #include <errno.h>
  32
  33 #include <glib.h>
  34 #include <X11/Xlib.h>
  35 #include <X11/Xatom.h>
  36 #include <gdk/gdk.h>
  37
  38 #include "main.h"
  39 #include "gui_support.h"
  40
  41 GdkFont         *item_font = NULL;
  42 GdkFont         *fixed_font = NULL;
  43 GtkStyle        *fixed_style = NULL;
  44 gint            fixed_width;
  45
  46 static GdkAtom xa_cardinal;
  47
  48 void gui_support_init()
  49 {
  50         fixed_font = gdk_font_load("fixed");
  51         item_font = gtk_widget_get_default_style()->font;
  52
  53         fixed_style = gtk_style_copy(gtk_widget_get_default_style());
  54         fixed_style->font = fixed_font;
  55
  56         fixed_width = gdk_string_width(fixed_font, "m");
  57
  58         xa_cardinal  = gdk_atom_intern("CARDINAL", FALSE);
  59 }
  60
  61 static void choice_clicked(GtkWidget *widget, gpointer number)
  62 {
  63         int     *choice_return;
  64
  65         choice_return = gtk_object_get_data(GTK_OBJECT(widget),
  66                         "choice_return");
  67
  68         if (choice_return)
  69                 *choice_return = (int) number;
  70 }
  71
  72 /* Open a modal dialog box showing a message.
  73  * The user can choose from a selection of buttons at the bottom.
  74  * Returns -1 if the window is destroyed, or the number of the button
  75  * if one is clicked (starting from zero).
  76  */
  77 int get_choice(char *title,
  78                char *message,
  79                int number_of_buttons, ...)
  80 {
  81         GtkWidget       *dialog;
  82         GtkWidget       *vbox, *action_area, *separator;
  83         GtkWidget       *text, *text_container;
  84         GtkWidget       *button = NULL;
  85         int             i, retval;
  86         va_list ap;
  87         int             choice_return;
  88
  89         dialog = gtk_window_new(GTK_WINDOW_DIALOG);
  90         gtk_window_set_modal(GTK_WINDOW(dialog), TRUE);
  91         gtk_window_set_title(GTK_WINDOW(dialog), title);
  92         gtk_window_set_position(GTK_WINDOW(dialog), GTK_WIN_POS_CENTER);
  93
  94         vbox = gtk_vbox_new(FALSE, 0);
  95         gtk_container_add(GTK_CONTAINER(dialog), vbox);
  96
  97         action_area = gtk_hbox_new(TRUE, 5);
  98         gtk_container_set_border_width(GTK_CONTAINER(action_area), 10);
  99         gtk_box_pack_end(GTK_BOX(vbox), action_area, FALSE, TRUE, 0);
 100
 101         separator = gtk_hseparator_new ();
 102         gtk_box_pack_end(GTK_BOX(vbox), separator, FALSE, TRUE, 0);
 103
 104         text = gtk_label_new(message);
 105         gtk_label_set_line_wrap(GTK_LABEL(text), TRUE);
 106         text_container = gtk_event_box_new();
 107         gtk_container_set_border_width(GTK_CONTAINER(text_container), 32);
 108         gtk_container_add(GTK_CONTAINER(text_container), text);
 109
 110         gtk_box_pack_start(GTK_BOX(vbox),
 111                         text_container,
 112                         TRUE, TRUE, 0);
 113
 114         va_start(ap, number_of_buttons);
 115
 116         for (i = 0; i < number_of_buttons; i++)
 117         {
 118                 button = gtk_button_new_with_label(va_arg(ap, char *));
 119                 gtk_object_set_data(GTK_OBJECT(button), "choice_return",
 120                                 &choice_return);
 121                 gtk_box_pack_start(GTK_BOX(action_area),
 122                                 button,
 123                                 TRUE, TRUE, 16);
 124                 gtk_signal_connect(GTK_OBJECT(button), "clicked",
 125                                 choice_clicked, (gpointer) i);
 126                 if (i == 0)
 127                         gtk_window_set_focus(GTK_WINDOW(dialog), button);
 128         }
 129         if (!i)
 130                 gtk_widget_grab_focus(button);
 131
 132         va_end(ap);
 133
 134         gtk_object_set_data(GTK_OBJECT(dialog), "choice_return",
 135                                 &choice_return);
 136         gtk_signal_connect(GTK_OBJECT(dialog), "destroy", choice_clicked,
 137                         (gpointer) -1);
 138
 139         choice_return = -2;
 140
 141         gtk_widget_show_all(dialog);
 142
 143         while (choice_return == -2)
 144                 g_main_iteration(TRUE);
 145
 146         retval = choice_return;
 147
 148         if (retval != -1)
 149                 gtk_widget_destroy(dialog);
 150
 151         return retval;
 152 }
 153
 154 /* Display a message in a window */
 155 void report_error(char *title, char *message)
 156 {
 157         g_return_if_fail(message != NULL);
 158
 159         if (!title)
 160                 title = _("Error");
 161
 162         get_choice(title, message, 1, "OK");
 163 }
 164
 165 void set_cardinal_property(GdkWindow *window, GdkAtom prop, guint32 value)
 166 {
 167         gdk_property_change(window, prop, xa_cardinal, 32,
 168                                 GDK_PROP_MODE_REPLACE, (gchar *) &value, 1);
 169 }
 170
 171 void make_panel_window(GdkWindow *window)
 172 {
 173         static gboolean need_init = TRUE;
 174         static GdkAtom  xa_state;
 175
 176         if (need_init)
 177         {
 178                 xa_state = gdk_atom_intern("_WIN_STATE", FALSE);
 179                 need_init = FALSE;
 180         }
 181
 182         gdk_window_set_decorations(window, 0);
 183         gdk_window_set_functions(window, 0);
 184
 185         set_cardinal_property(window, xa_state,
 186                         WIN_STATE_STICKY | WIN_STATE_HIDDEN |
 187                         WIN_STATE_FIXED_POSITION | WIN_STATE_ARRANGE_IGNORE);
 188 }
 189
 190 gint hide_dialog_event(GtkWidget *widget, GdkEvent *event, gpointer window)
 191 {
 192         gtk_widget_hide((GtkWidget *) window);
 193
 194         return TRUE;
 195 }
 196
 197 static gboolean error_idle_cb(gpointer data)
 198 {
 199         char    **error = (char **) data;
 200
 201         report_error(error[0], error[1]);
 202         g_free(error[0]);
 203         g_free(error[1]);
 204         error[0] = error[1] = NULL;
 205
 206         if (--number_of_windows == 0)
 207                 gtk_main_quit();
 208
 209         return FALSE;
 210 }
 211
 212 /* Display an error next time we are idle */
 213 void delayed_error(char *title, char *error)
 214 {
 215         static char *delayed_error_data[2] = {NULL, NULL};
 216         gboolean already_open;
 217
 218         g_return_if_fail(error != NULL);
 219
 220         already_open = delayed_error_data[1] != NULL;
 221
 222         g_free(delayed_error_data[0]);
 223         g_free(delayed_error_data[1]);
 224
 225         delayed_error_data[0] = g_strdup(title);
 226         delayed_error_data[1] = g_strdup(error);
 227
 228         if (already_open)
 229                 return;
 230
 231         gtk_idle_add(error_idle_cb, delayed_error_data);
 232
 233         number_of_windows++;
 234 }
 235
 236 /* Load the file into memory. Return TRUE on success.
 237  * Block is zero terminated (but this is not included in the length).
 238  */
 239 gboolean load_file(char *pathname, char **data_out, long *length_out)
 240 {
 241         FILE            *file;
 242         long            length;
 243         char            *buffer;
 244         gboolean        retval = FALSE;
 245
 246         file = fopen(pathname, "r");
 247
 248         if (!file)
 249         {
 250                 guchar  *message;
 251
 252                 message = g_strdup_printf("open(%s): %s",
 253                                 pathname, g_strerror(errno));
 254                 delayed_error(PROJECT, message);
 255                 g_free(message);
 256                 return FALSE;
 257         }
 258
 259         fseek(file, 0, SEEK_END);
 260         length = ftell(file);
 261
 262         buffer = malloc(length + 1);
 263         if (buffer)
 264         {
 265                 fseek(file, 0, SEEK_SET);
 266                 fread(buffer, 1, length, file);
 267
 268                 if (ferror(file))
 269                 {
 270                         delayed_error(_("Error reading file"),
 271                                                 g_strerror(errno));
 272                         g_free(buffer);
 273                 }
 274                 else
 275                 {
 276                         *data_out = buffer;
 277                         *length_out = length;
 278                         buffer[length] = '\0';
 279                         retval = TRUE;
 280                 }
 281         }
 282         else
 283                 delayed_error(PROJECT,
 284                         _("Can't allocate memory for buffer to "
 285                                 "load this file"));
 286
 287         fclose(file);
 288
 289         return retval;
 290 }