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 <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 GdkFont         *item_font = NULL;
  40 GdkFont         *fixed_font = NULL;
  41 GtkStyle        *fixed_style = NULL;
  42 gint            fixed_width;
  43
  44 static GdkAtom xa_cardinal;
  45
  46 void gui_support_init()
  47 {
  48         fixed_font = gdk_font_load("fixed");
  49         item_font = gtk_widget_get_default_style()->font;
  50
  51         fixed_style = gtk_style_copy(gtk_widget_get_default_style());
  52         fixed_style->font = fixed_font;
  53
  54         fixed_width = gdk_string_width(fixed_font, "m");
  55
  56         xa_cardinal  = gdk_atom_intern("CARDINAL", FALSE);
  57 }
  58
  59 static void choice_clicked(GtkWidget *widget, gpointer number)
  60 {
  61         int     *choice_return;
  62
  63         choice_return = gtk_object_get_data(GTK_OBJECT(widget),
  64                         "choice_return");
  65
  66         if (choice_return)
  67                 *choice_return = (int) number;
  68 }
  69
  70 /* Open a modal dialog box showing a message.
  71  * The user can choose from a selection of buttons at the bottom.
  72  * Returns -1 if the window is destroyed, or the number of the button
  73  * if one is clicked (starting from zero).
  74  */
  75 int get_choice(char *title,
  76                char *message,
  77                int number_of_buttons, ...)
  78 {
  79         GtkWidget       *dialog;
  80         GtkWidget       *vbox, *action_area, *separator;
  81         GtkWidget       *text, *text_container;
  82         GtkWidget       *button = NULL;
  83         int             i, retval;
  84         va_list ap;
  85         int             choice_return;
  86
  87         dialog = gtk_window_new(GTK_WINDOW_DIALOG);
  88         gtk_window_set_modal(GTK_WINDOW(dialog), TRUE);
  89         gtk_window_set_title(GTK_WINDOW(dialog), title);
  90         gtk_window_set_position(GTK_WINDOW(dialog), GTK_WIN_POS_CENTER);
  91
  92         vbox = gtk_vbox_new(FALSE, 0);
  93         gtk_container_add(GTK_CONTAINER(dialog), vbox);
  94
  95         action_area = gtk_hbox_new(TRUE, 5);
  96         gtk_container_set_border_width(GTK_CONTAINER(action_area), 10);
  97         gtk_box_pack_end(GTK_BOX(vbox), action_area, FALSE, TRUE, 0);
  98
  99         separator = gtk_hseparator_new ();
 100         gtk_box_pack_end(GTK_BOX(vbox), separator, FALSE, TRUE, 0);
 101
 102         text = gtk_label_new(message);
 103         gtk_label_set_line_wrap(GTK_LABEL(text), TRUE);
 104         text_container = gtk_event_box_new();
 105         gtk_container_set_border_width(GTK_CONTAINER(text_container), 32);
 106         gtk_container_add(GTK_CONTAINER(text_container), text);
 107
 108         gtk_box_pack_start(GTK_BOX(vbox),
 109                         text_container,
 110                         TRUE, TRUE, 0);
 111
 112         va_start(ap, number_of_buttons);
 113
 114         for (i = 0; i < number_of_buttons; i++)
 115         {
 116                 button = gtk_button_new_with_label(va_arg(ap, char *));
 117                 gtk_object_set_data(GTK_OBJECT(button), "choice_return",
 118                                 &choice_return);
 119                 gtk_box_pack_start(GTK_BOX(action_area),
 120                                 button,
 121                                 TRUE, TRUE, 16);
 122                 gtk_signal_connect(GTK_OBJECT(button), "clicked",
 123                                 choice_clicked, (gpointer) i);
 124                 if (i == 0)
 125                         gtk_window_set_focus(GTK_WINDOW(dialog), button);
 126         }
 127         if (!i)
 128                 gtk_widget_grab_focus(button);
 129
 130         va_end(ap);
 131
 132         gtk_object_set_data(GTK_OBJECT(dialog), "choice_return",
 133                                 &choice_return);
 134         gtk_signal_connect(GTK_OBJECT(dialog), "destroy", choice_clicked,
 135                         (gpointer) -1);
 136
 137         choice_return = -2;
 138
 139         gtk_widget_show_all(dialog);
 140
 141         while (choice_return == -2)
 142                 g_main_iteration(TRUE);
 143
 144         retval = choice_return;
 145
 146         if (retval != -1)
 147                 gtk_widget_destroy(dialog);
 148
 149         return retval;
 150 }
 151
 152 /* Display a message in a window */
 153 void report_error(char *title, char *message)
 154 {
 155         g_return_if_fail(message != NULL);
 156
 157         if (!title)
 158                 title = "Error";
 159
 160         get_choice(title, message, 1, "OK");
 161 }
 162
 163 void set_cardinal_property(GdkWindow *window, GdkAtom prop, guint32 value)
 164 {
 165         gdk_property_change(window, prop, xa_cardinal, 32,
 166                                 GDK_PROP_MODE_REPLACE, (gchar *) &value, 1);
 167 }
 168
 169 void make_panel_window(GdkWindow *window)
 170 {
 171         static gboolean need_init = TRUE;
 172         static GdkAtom  xa_state;
 173
 174         if (need_init)
 175         {
 176                 xa_state = gdk_atom_intern("_WIN_STATE", FALSE);
 177                 need_init = FALSE;
 178         }
 179
 180         gdk_window_set_decorations(window, 0);
 181         gdk_window_set_functions(window, 0);
 182
 183         set_cardinal_property(window, xa_state,
 184                         WIN_STATE_STICKY | WIN_STATE_HIDDEN |
 185                         WIN_STATE_FIXED_POSITION | WIN_STATE_ARRANGE_IGNORE);
 186 }
 187
 188 gint hide_dialog_event(GtkWidget *widget, GdkEvent *event, gpointer window)
 189 {
 190         gtk_widget_hide((GtkWidget *) window);
 191
 192         return TRUE;
 193 }
 194
 195 static gboolean error_idle_cb(gpointer data)
 196 {
 197         char    **error = (char **) data;
 198
 199         report_error(error[0], error[1]);
 200         g_free(error[0]);
 201         g_free(error[1]);
 202         error[0] = error[1] = NULL;
 203
 204         if (--number_of_windows == 0)
 205                 gtk_main_quit();
 206
 207         return FALSE;
 208 }
 209
 210 /* Display an error next time we are idle */
 211 void delayed_error(char *title, char *error)
 212 {
 213         static char *delayed_error_data[2] = {NULL, NULL};
 214         gboolean already_open;
 215
 216         g_return_if_fail(error != NULL);
 217
 218         already_open = delayed_error_data[1] != NULL;
 219
 220         g_free(delayed_error_data[0]);
 221         g_free(delayed_error_data[1]);
 222
 223         delayed_error_data[0] = g_strdup(title);
 224         delayed_error_data[1] = g_strdup(error);
 225
 226         if (already_open)
 227                 return;
 228
 229         gtk_idle_add(error_idle_cb, delayed_error_data);
 230
 231         number_of_windows++;
 232 }
 233
 234 /* Load the file into memory. Return TRUE on success.
 235  * Block is zero terminated (but this is not included in the length).
 236  */
 237 gboolean load_file(char *pathname, char **data_out, long *length_out)
 238 {
 239         FILE            *file;
 240         long            length;
 241         char            *buffer;
 242         gboolean        retval = FALSE;
 243
 244         file = fopen(pathname, "r");
 245
 246         if (!file)
 247         {
 248                 delayed_error("Opening file for DND", g_strerror(errno));
 249                 return FALSE;
 250         }
 251
 252         fseek(file, 0, SEEK_END);
 253         length = ftell(file);
 254
 255         buffer = malloc(length + 1);
 256         if (buffer)
 257         {
 258                 fseek(file, 0, SEEK_SET);
 259                 fread(buffer, 1, length, file);
 260
 261                 if (ferror(file))
 262                 {
 263                         delayed_error("Loading file for DND",
 264                                                 g_strerror(errno));
 265                         g_free(buffer);
 266                 }
 267                 else
 268                 {
 269                         *data_out = buffer;
 270                         *length_out = length;
 271                         buffer[length] = '\0';
 272                         retval = TRUE;
 273                 }
 274         }
 275         else
 276                 delayed_error("Loading file for DND",
 277                                 "Can't allocate memory for buffer to "
 278                                 "transfer this file");
 279
 280         fclose(file);
 281
 282         return retval;
 283 }