ROX-Filer/src/gui_support.c

   1 /*
   2  * $Id$
   3  *
   4  * ROX-Filer, filer for the ROX desktop project
   5  * Copyright (C) 1999, 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 <stdio.h>
  25 #include <stdlib.h>
  26 #include <string.h>
  27 #include <sys/param.h>
  28 #include <stdarg.h>
  29 #include <errno.h>
  30
  31 #include <glib.h>
  32 #include <X11/Xlib.h>
  33 #include <X11/Xatom.h>
  34 #include <gdk/gdk.h>
  35
  36 #include "main.h"
  37 #include "gui_support.h"
  38
  39 static GdkAtom xa_cardinal;
  40
  41 void gui_support_init()
  42 {
  43         xa_cardinal  = gdk_atom_intern("CARDINAL", FALSE);
  44 }
  45
  46 static void choice_clicked(GtkWidget *widget, gpointer number)
  47 {
  48         int     *choice_return;
  49
  50         choice_return = gtk_object_get_data(GTK_OBJECT(widget),
  51                         "choice_return");
  52
  53         if (choice_return)
  54                 *choice_return = (int) number;
  55 }
  56
  57 /* Open a modal dialog box showing a message.
  58  * The user can choose from a selection of buttons at the bottom.
  59  * Returns -1 if the window is destroyed, or the number of the button
  60  * if one is clicked (starting from zero).
  61  */
  62 int get_choice(char *title,
  63                char *message,
  64                int number_of_buttons, ...)
  65 {
  66         GtkWidget       *dialog;
  67         GtkWidget       *vbox, *action_area, *separator;
  68         GtkWidget       *text, *text_container;
  69         GtkWidget       *button = NULL;
  70         int             i, retval;
  71         va_list ap;
  72         int             choice_return;
  73
  74         dialog = gtk_window_new(GTK_WINDOW_DIALOG);
  75         gtk_window_set_modal(GTK_WINDOW(dialog), TRUE);
  76         gtk_window_set_title(GTK_WINDOW(dialog), title);
  77         gtk_window_set_position(GTK_WINDOW(dialog), GTK_WIN_POS_CENTER);
  78
  79         vbox = gtk_vbox_new(FALSE, 0);
  80         gtk_container_add(GTK_CONTAINER(dialog), vbox);
  81
  82         action_area = gtk_hbox_new(TRUE, 5);
  83         gtk_container_set_border_width(GTK_CONTAINER(action_area), 10);
  84         gtk_box_pack_end(GTK_BOX(vbox), action_area, FALSE, TRUE, 0);
  85
  86         separator = gtk_hseparator_new ();
  87         gtk_box_pack_end(GTK_BOX(vbox), separator, FALSE, TRUE, 0);
  88
  89         text = gtk_label_new(message);
  90         gtk_label_set_line_wrap(GTK_LABEL(text), TRUE);
  91         text_container = gtk_event_box_new();
  92         gtk_container_set_border_width(GTK_CONTAINER(text_container), 32);
  93         gtk_container_add(GTK_CONTAINER(text_container), text);
  94
  95         gtk_box_pack_start(GTK_BOX(vbox),
  96                         text_container,
  97                         TRUE, TRUE, 0);
  98
  99         va_start(ap, number_of_buttons);
 100
 101         for (i = 0; i < number_of_buttons; i++)
 102         {
 103                 button = gtk_button_new_with_label(va_arg(ap, char *));
 104                 gtk_object_set_data(GTK_OBJECT(button), "choice_return",
 105                                 &choice_return);
 106                 gtk_box_pack_start(GTK_BOX(action_area),
 107                                 button,
 108                                 TRUE, TRUE, 16);
 109                 gtk_signal_connect(GTK_OBJECT(button), "clicked",
 110                                 choice_clicked, (gpointer) i);
 111                 if (i == 0)
 112                         gtk_window_set_focus(GTK_WINDOW(dialog), button);
 113         }
 114         if (!i)
 115                 gtk_widget_grab_focus(button);
 116
 117         va_end(ap);
 118
 119         gtk_object_set_data(GTK_OBJECT(dialog), "choice_return",
 120                                 &choice_return);
 121         gtk_signal_connect(GTK_OBJECT(dialog), "destroy", choice_clicked,
 122                         (gpointer) -1);
 123
 124         choice_return = -2;
 125
 126         gtk_widget_show_all(dialog);
 127
 128         while (choice_return == -2)
 129                 g_main_iteration(TRUE);
 130
 131         retval = choice_return;
 132
 133         if (retval != -1)
 134                 gtk_widget_destroy(dialog);
 135
 136         return retval;
 137 }
 138
 139 /* Display a message in a window */
 140 void report_error(char *title, char *message)
 141 {
 142         g_return_if_fail(message != NULL);
 143
 144         if (!title)
 145                 title = "Error";
 146
 147         get_choice(title, message, 1, "OK");
 148 }
 149
 150 void set_cardinal_property(GdkWindow *window, GdkAtom prop, guint32 value)
 151 {
 152         gdk_property_change(window, prop, xa_cardinal, 32,
 153                                 GDK_PROP_MODE_REPLACE, (gchar *) &value, 1);
 154 }
 155
 156 void make_panel_window(GdkWindow *window)
 157 {
 158         static gboolean need_init = TRUE;
 159         static GdkAtom  xa_state;
 160
 161         if (need_init)
 162         {
 163                 xa_state = gdk_atom_intern("_WIN_STATE", FALSE);
 164                 need_init = FALSE;
 165         }
 166
 167         gdk_window_set_decorations(window, 0);
 168         gdk_window_set_functions(window, 0);
 169
 170         set_cardinal_property(window, xa_state,
 171                         WIN_STATE_STICKY | WIN_STATE_HIDDEN |
 172                         WIN_STATE_FIXED_POSITION | WIN_STATE_ARRANGE_IGNORE);
 173 }
 174
 175 gint hide_dialog_event(GtkWidget *widget, GdkEvent *event, gpointer window)
 176 {
 177         gtk_widget_hide((GtkWidget *) window);
 178
 179         return TRUE;
 180 }
 181
 182 static gboolean error_idle_cb(gpointer data)
 183 {
 184         char    **error = (char **) data;
 185
 186         report_error(error[0], error[1]);
 187         g_free(error[0]);
 188         g_free(error[1]);
 189         error[0] = error[1] = NULL;
 190
 191         if (--number_of_windows == 0)
 192                 gtk_main_quit();
 193
 194         return FALSE;
 195 }
 196
 197 /* Display an error next time we are idle */
 198 void delayed_error(char *title, char *error)
 199 {
 200         static char *delayed_error_data[2] = {NULL, NULL};
 201         gboolean already_open;
 202
 203         g_return_if_fail(error != NULL);
 204
 205         already_open = delayed_error_data[1] != NULL;
 206
 207         g_free(delayed_error_data[0]);
 208         g_free(delayed_error_data[1]);
 209
 210         delayed_error_data[0] = g_strdup(title);
 211         delayed_error_data[1] = g_strdup(error);
 212
 213         if (already_open)
 214                 return;
 215
 216         gtk_idle_add(error_idle_cb, delayed_error_data);
 217
 218         number_of_windows++;
 219 }
 220
 221 /* Load the file into memory. Return TRUE on success.
 222  * Block is zero terminated (but this is not included in the length).
 223  */
 224 gboolean load_file(char *pathname, char **data_out, long *length_out)
 225 {
 226         FILE            *file;
 227         long            length;
 228         char            *buffer;
 229         gboolean        retval = FALSE;
 230
 231         file = fopen(pathname, "r");
 232
 233         if (!file)
 234         {
 235                 delayed_error("Opening file for DND", g_strerror(errno));
 236                 return FALSE;
 237         }
 238
 239         fseek(file, 0, SEEK_END);
 240         length = ftell(file);
 241
 242         buffer = malloc(length + 1);
 243         if (buffer)
 244         {
 245                 fseek(file, 0, SEEK_SET);
 246                 fread(buffer, 1, length, file);
 247
 248                 if (ferror(file))
 249                 {
 250                         delayed_error("Loading file for DND",
 251                                                 g_strerror(errno));
 252                         g_free(buffer);
 253                 }
 254                 else
 255                 {
 256                         *data_out = buffer;
 257                         *length_out = length;
 258                         buffer[length] = '\0';
 259                         retval = TRUE;
 260                 }
 261         }
 262         else
 263                 delayed_error("Loading file for DND",
 264                                 "Can't allocate memory for buffer to "
 265                                 "transfer this file");
 266
 267         fclose(file);
 268
 269         return retval;
 270 }