Pileus Git - ~andy/gtk/blob - gtk/gtkcellrendereraccel.c

   1 /* gtkcellrendereraccel.h
   2  * Copyright (C) 2000  Red Hat, Inc.,  Jonathan Blandford <jrb@redhat.com>
   3  *
   4  * This library is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU Library General Public
   6  * License as published by the Free Software Foundation; either
   7  * version 2 of the License, or (at your option) any later version.
   8  *
   9  * This library is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * Library General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU Library General Public
  15  * License along with this library. If not, see <http://www.gnu.org/licenses/>.
  16  */
  17
  18 #include "config.h"
  19
  20 #include "gtkcellrendereraccel.h"
  21
  22 #include "gtkintl.h"
  23 #include "gtkaccelgroup.h"
  24 #include "gtkmarshalers.h"
  25 #include "gtklabel.h"
  26 #include "gtkeventbox.h"
  27 #include "gtkmain.h"
  28 #include "gtksizerequest.h"
  29 #include "gtktypebuiltins.h"
  30 #include "gtkprivate.h"
  31
  32
  33 /**
  34  * SECTION:gtkcellrendereraccel
  35  * @Short_description: Renders a keyboard accelerator in a cell
  36  * @Title: GtkCellRendererAccel
  37  *
  38  * #GtkCellRendererAccel displays a keyboard accelerator (i.e. a
  39  * key combination like <keycombo><keycap>Control</keycap><keycap>a</keycap></keycombo>.
  40  * If the cell renderer is editable, the accelerator can be changed by
  41  * simply typing the new combination.
  42  *
  43  * The #GtkCellRendererAccel cell renderer was added in GTK+ 2.10.
  44  */
  45
  46
  47
  48 static void gtk_cell_renderer_accel_get_property (GObject         *object,
  49                                                   guint            param_id,
  50                                                   GValue          *value,
  51                                                   GParamSpec      *pspec);
  52 static void gtk_cell_renderer_accel_set_property (GObject         *object,
  53                                                   guint            param_id,
  54                                                   const GValue    *value,
  55                                                   GParamSpec      *pspec);
  56 static void gtk_cell_renderer_accel_get_preferred_width
  57                                                  (GtkCellRenderer *cell,
  58                                                   GtkWidget       *widget,
  59                                                   gint            *minimum_size,
  60                                                   gint            *natural_size);
  61 static GtkCellEditable *
  62            gtk_cell_renderer_accel_start_editing (GtkCellRenderer      *cell,
  63                                                   GdkEvent             *event,
  64                                                   GtkWidget            *widget,
  65                                                   const gchar          *path,
  66                                                   const GdkRectangle   *background_area,
  67                                                   const GdkRectangle   *cell_area,
  68                                                   GtkCellRendererState  flags);
  69 static gchar *convert_keysym_state_to_string     (GtkCellRendererAccel *accel,
  70                                                   guint                 keysym,
  71                                                   GdkModifierType       mask,
  72                                                   guint                 keycode);
  73
  74 enum {
  75   ACCEL_EDITED,
  76   ACCEL_CLEARED,
  77   LAST_SIGNAL
  78 };
  79
  80 enum {
  81   PROP_0,
  82   PROP_ACCEL_KEY,
  83   PROP_ACCEL_MODS,
  84   PROP_KEYCODE,
  85   PROP_ACCEL_MODE
  86 };
  87
  88 struct _GtkCellRendererAccelPrivate
  89 {
  90   GtkWidget *edit_widget;
  91   GtkWidget *grab_widget;
  92   GtkWidget *sizing_label;
  93
  94   GdkDevice *grab_keyboard;
  95   GdkDevice *grab_pointer;
  96
  97   GtkCellRendererAccelMode accel_mode;
  98
  99   GdkModifierType accel_mods;
 100
 101   guint accel_key;
 102   guint keycode;
 103 };
 104
 105 static guint signals[LAST_SIGNAL] = { 0 };
 106
 107 G_DEFINE_TYPE (GtkCellRendererAccel, gtk_cell_renderer_accel, GTK_TYPE_CELL_RENDERER_TEXT)
 108
 109 static void
 110 gtk_cell_renderer_accel_init (GtkCellRendererAccel *cell_accel)
 111 {
 112   gchar *text;
 113
 114   cell_accel->priv = G_TYPE_INSTANCE_GET_PRIVATE (cell_accel,
 115                                                   GTK_TYPE_CELL_RENDERER_ACCEL,
 116                                                   GtkCellRendererAccelPrivate);
 117
 118   text = convert_keysym_state_to_string (cell_accel, 0, 0, 0);
 119   g_object_set (cell_accel, "text", text, NULL);
 120   g_free (text);
 121 }
 122
 123 static void
 124 gtk_cell_renderer_accel_class_init (GtkCellRendererAccelClass *cell_accel_class)
 125 {
 126   GObjectClass *object_class;
 127   GtkCellRendererClass *cell_renderer_class;
 128
 129   object_class = G_OBJECT_CLASS (cell_accel_class);
 130   cell_renderer_class = GTK_CELL_RENDERER_CLASS (cell_accel_class);
 131
 132   object_class->set_property = gtk_cell_renderer_accel_set_property;
 133   object_class->get_property = gtk_cell_renderer_accel_get_property;
 134
 135   cell_renderer_class->get_preferred_width = gtk_cell_renderer_accel_get_preferred_width;
 136   cell_renderer_class->start_editing = gtk_cell_renderer_accel_start_editing;
 137
 138   /**
 139    * GtkCellRendererAccel:accel-key:
 140    *
 141    * The keyval of the accelerator.
 142    *
 143    * Since: 2.10
 144    */
 145   g_object_class_install_property (object_class,
 146                                    PROP_ACCEL_KEY,
 147                                    g_param_spec_uint ("accel-key",
 148                                                      P_("Accelerator key"),
 149                                                      P_("The keyval of the accelerator"),
 150                                                       0,
 151                                                       G_MAXINT,
 152                                                       0,
 153                                                       GTK_PARAM_READWRITE));
 154
 155   /**
 156    * GtkCellRendererAccel:accel-mods:
 157    *
 158    * The modifier mask of the accelerator.
 159    *
 160    * Since: 2.10
 161    */
 162   g_object_class_install_property (object_class,
 163                                    PROP_ACCEL_MODS,
 164                                    g_param_spec_flags ("accel-mods",
 165                                                        P_("Accelerator modifiers"),
 166                                                        P_("The modifier mask of the accelerator"),
 167                                                        GDK_TYPE_MODIFIER_TYPE,
 168                                                        0,
 169                                                        GTK_PARAM_READWRITE));
 170
 171   /**
 172    * GtkCellRendererAccel:keycode:
 173    *
 174    * The hardware keycode of the accelerator. Note that the hardware keycode is
 175    * only relevant if the key does not have a keyval. Normally, the keyboard
 176    * configuration should assign keyvals to all keys.
 177    *
 178    * Since: 2.10
 179    */
 180   g_object_class_install_property (object_class,
 181                                    PROP_KEYCODE,
 182                                    g_param_spec_uint ("keycode",
 183                                                       P_("Accelerator keycode"),
 184                                                       P_("The hardware keycode of the accelerator"),
 185                                                       0,
 186                                                       G_MAXINT,
 187                                                       0,
 188                                                       GTK_PARAM_READWRITE));
 189
 190   /**
 191    * GtkCellRendererAccel:accel-mode:
 192    *
 193    * Determines if the edited accelerators are GTK+ accelerators. If
 194    * they are, consumed modifiers are suppressed, only accelerators
 195    * accepted by GTK+ are allowed, and the accelerators are rendered
 196    * in the same way as they are in menus.
 197    *
 198    * Since: 2.10
 199    */
 200   g_object_class_install_property (object_class,
 201                                    PROP_ACCEL_MODE,
 202                                    g_param_spec_enum ("accel-mode",
 203                                                       P_("Accelerator Mode"),
 204                                                       P_("The type of accelerators"),
 205                                                       GTK_TYPE_CELL_RENDERER_ACCEL_MODE,
 206                                                       GTK_CELL_RENDERER_ACCEL_MODE_GTK,
 207                                                       GTK_PARAM_READWRITE));
 208
 209   /**
 210    * GtkCellRendererAccel::accel-edited:
 211    * @accel: the object reveiving the signal
 212    * @path_string: the path identifying the row of the edited cell
 213    * @accel_key: the new accelerator keyval
 214    * @accel_mods: the new acclerator modifier mask
 215    * @hardware_keycode: the keycode of the new accelerator
 216    *
 217    * Gets emitted when the user has selected a new accelerator.
 218    *
 219    * Since: 2.10
 220    */
 221   signals[ACCEL_EDITED] = g_signal_new (I_("accel-edited"),
 222                                         GTK_TYPE_CELL_RENDERER_ACCEL,
 223                                         G_SIGNAL_RUN_LAST,
 224                                         G_STRUCT_OFFSET (GtkCellRendererAccelClass, accel_edited),
 225                                         NULL, NULL,
 226                                         _gtk_marshal_VOID__STRING_UINT_FLAGS_UINT,
 227                                         G_TYPE_NONE, 4,
 228                                         G_TYPE_STRING,
 229                                         G_TYPE_UINT,
 230                                         GDK_TYPE_MODIFIER_TYPE,
 231                                         G_TYPE_UINT);
 232
 233   /**
 234    * GtkCellRendererAccel::accel-cleared:
 235    * @accel: the object reveiving the signal
 236    * @path_string: the path identifying the row of the edited cell
 237    *
 238    * Gets emitted when the user has removed the accelerator.
 239    *
 240    * Since: 2.10
 241    */
 242   signals[ACCEL_CLEARED] = g_signal_new (I_("accel-cleared"),
 243                                          GTK_TYPE_CELL_RENDERER_ACCEL,
 244                                          G_SIGNAL_RUN_LAST,
 245                                          G_STRUCT_OFFSET (GtkCellRendererAccelClass, accel_cleared),
 246                                          NULL, NULL,
 247                                          g_cclosure_marshal_VOID__STRING,
 248                                          G_TYPE_NONE, 1,
 249                                          G_TYPE_STRING);
 250
 251   g_type_class_add_private (cell_accel_class, sizeof (GtkCellRendererAccelPrivate));
 252 }
 253
 254
 255 /**
 256  * gtk_cell_renderer_accel_new:
 257  *
 258  * Creates a new #GtkCellRendererAccel.
 259  *
 260  * Returns: the new cell renderer
 261  *
 262  * Since: 2.10
 263  */
 264 GtkCellRenderer *
 265 gtk_cell_renderer_accel_new (void)
 266 {
 267   return g_object_new (GTK_TYPE_CELL_RENDERER_ACCEL, NULL);
 268 }
 269
 270 static gchar *
 271 convert_keysym_state_to_string (GtkCellRendererAccel *accel,
 272                                 guint                 keysym,
 273                                 GdkModifierType       mask,
 274                                 guint                 keycode)
 275 {
 276   GtkCellRendererAccelPrivate *priv = accel->priv;
 277
 278   if (keysym == 0 && keycode == 0)
 279     /* This label is displayed in a treeview cell displaying
 280      * a disabled accelerator key combination.
 281      */
 282     return g_strdup (C_("Accelerator", "Disabled"));
 283   else
 284     {
 285       if (priv->accel_mode == GTK_CELL_RENDERER_ACCEL_MODE_GTK)
 286         {
 287           if (!gtk_accelerator_valid (keysym, mask))
 288             /* This label is displayed in a treeview cell displaying
 289              * an accelerator key combination that is not valid according
 290              * to gtk_accelerator_valid().
 291              */
 292             return g_strdup (C_("Accelerator", "Invalid"));
 293
 294           return gtk_accelerator_get_label (keysym, mask);
 295         }
 296       else
 297         {
 298           gchar *name;
 299
 300           name = gtk_accelerator_get_label_with_keycode (NULL, keysym, keycode, mask);
 301           if (name == NULL)
 302             name = gtk_accelerator_name_with_keycode (NULL, keysym, keycode, mask);
 303
 304           return name;
 305         }
 306     }
 307 }
 308
 309 static void
 310 gtk_cell_renderer_accel_get_property  (GObject    *object,
 311                                        guint       param_id,
 312                                        GValue     *value,
 313                                        GParamSpec *pspec)
 314 {
 315   GtkCellRendererAccelPrivate *priv = GTK_CELL_RENDERER_ACCEL (object)->priv;
 316
 317   switch (param_id)
 318     {
 319     case PROP_ACCEL_KEY:
 320       g_value_set_uint (value, priv->accel_key);
 321       break;
 322
 323     case PROP_ACCEL_MODS:
 324       g_value_set_flags (value, priv->accel_mods);
 325       break;
 326
 327     case PROP_KEYCODE:
 328       g_value_set_uint (value, priv->keycode);
 329       break;
 330
 331     case PROP_ACCEL_MODE:
 332       g_value_set_enum (value, priv->accel_mode);
 333       break;
 334
 335     default:
 336       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, param_id, pspec);
 337     }
 338 }
 339
 340 static void
 341 gtk_cell_renderer_accel_set_property  (GObject      *object,
 342                                        guint         param_id,
 343                                        const GValue *value,
 344                                        GParamSpec   *pspec)
 345 {
 346   GtkCellRendererAccel *accel = GTK_CELL_RENDERER_ACCEL (object);
 347   GtkCellRendererAccelPrivate *priv = accel->priv;
 348   gboolean changed = FALSE;
 349
 350   switch (param_id)
 351     {
 352     case PROP_ACCEL_KEY:
 353       {
 354         guint accel_key = g_value_get_uint (value);
 355
 356         if (priv->accel_key != accel_key)
 357           {
 358             priv->accel_key = accel_key;
 359             changed = TRUE;
 360           }
 361       }
 362       break;
 363
 364     case PROP_ACCEL_MODS:
 365       {
 366         guint accel_mods = g_value_get_flags (value);
 367
 368         if (priv->accel_mods != accel_mods)
 369           {
 370             priv->accel_mods = accel_mods;
 371             changed = TRUE;
 372           }
 373       }
 374       break;
 375     case PROP_KEYCODE:
 376       {
 377         guint keycode = g_value_get_uint (value);
 378
 379         if (priv->keycode != keycode)
 380           {
 381             priv->keycode = keycode;
 382             changed = TRUE;
 383           }
 384       }
 385       break;
 386
 387     case PROP_ACCEL_MODE:
 388       priv->accel_mode = g_value_get_enum (value);
 389       break;
 390
 391     default:
 392       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, param_id, pspec);
 393     }
 394
 395   if (changed)
 396     {
 397       gchar *text;
 398
 399       text = convert_keysym_state_to_string (accel, priv->accel_key, priv->accel_mods, priv->keycode);
 400       g_object_set (accel, "text", text, NULL);
 401       g_free (text);
 402     }
 403 }
 404
 405 static void
 406 gtk_cell_renderer_accel_get_preferred_width (GtkCellRenderer    *cell,
 407                                              GtkWidget          *widget,
 408                                              gint               *minimum_size,
 409                                              gint               *natural_size)
 410
 411 {
 412   GtkCellRendererAccelPrivate *priv = GTK_CELL_RENDERER_ACCEL (cell)->priv;
 413   GtkRequisition min_req, nat_req;
 414
 415   if (priv->sizing_label == NULL)
 416     priv->sizing_label = gtk_label_new (_("New accelerator…"));
 417
 418   gtk_widget_get_preferred_size (priv->sizing_label, &min_req, &nat_req);
 419
 420   GTK_CELL_RENDERER_CLASS (gtk_cell_renderer_accel_parent_class)->get_preferred_width (cell, widget,
 421                                                                                        minimum_size, natural_size);
 422
 423   /* FIXME: need to take the cell_area et al. into account */
 424   if (minimum_size)
 425     *minimum_size = MAX (*minimum_size, min_req.width);
 426   if (natural_size)
 427     *natural_size = MAX (*natural_size, nat_req.width);
 428 }
 429
 430 static gboolean
 431 grab_key_callback (GtkWidget            *widget,
 432                    GdkEventKey          *event,
 433                    GtkCellRendererAccel *accel)
 434 {
 435   GtkCellRendererAccelPrivate *priv = accel->priv;
 436   GdkModifierType accel_mods = 0;
 437   guint accel_key;
 438   guint keyval;
 439   gchar *path;
 440   gboolean edited;
 441   gboolean cleared;
 442   GdkModifierType consumed_modifiers;
 443   GdkDisplay *display;
 444
 445   display = gtk_widget_get_display (widget);
 446
 447   if (event->is_modifier)
 448     return TRUE;
 449
 450   edited = FALSE;
 451   cleared = FALSE;
 452
 453   accel_mods = event->state;
 454
 455   if (event->keyval == GDK_KEY_Sys_Req &&
 456       (accel_mods & GDK_MOD1_MASK) != 0)
 457     {
 458       /* HACK: we don't want to use SysRq as a keybinding (but we do
 459        * want Alt+Print), so we avoid translation from Alt+Print to SysRq
 460        */
 461       keyval = GDK_KEY_Print;
 462       consumed_modifiers = 0;
 463     }
 464   else
 465     {
 466       _gtk_translate_keyboard_accel_state (gdk_keymap_get_for_display (display),
 467                                            event->hardware_keycode,
 468                                            event->state,
 469                                            gtk_accelerator_get_default_mod_mask (),
 470                                            event->group,
 471                                            &keyval, NULL, NULL, &consumed_modifiers);
 472     }
 473
 474   accel_key = gdk_keyval_to_lower (keyval);
 475   if (accel_key == GDK_KEY_ISO_Left_Tab)
 476     accel_key = GDK_KEY_Tab;
 477
 478   accel_mods &= gtk_accelerator_get_default_mod_mask ();
 479
 480   /* Filter consumed modifiers
 481    */
 482   if (priv->accel_mode == GTK_CELL_RENDERER_ACCEL_MODE_GTK)
 483     accel_mods &= ~consumed_modifiers;
 484
 485   /* Put shift back if it changed the case of the key, not otherwise.
 486    */
 487   if (accel_key != keyval)
 488     accel_mods |= GDK_SHIFT_MASK;
 489
 490   if (accel_mods == 0)
 491     {
 492       switch (keyval)
 493         {
 494         case GDK_KEY_Escape:
 495           goto out; /* cancel */
 496         case GDK_KEY_BackSpace:
 497           /* clear the accelerator on Backspace */
 498           cleared = TRUE;
 499           goto out;
 500         default:
 501           break;
 502         }
 503     }
 504
 505   if (priv->accel_mode == GTK_CELL_RENDERER_ACCEL_MODE_GTK)
 506     {
 507       if (!gtk_accelerator_valid (accel_key, accel_mods))
 508         {
 509           gtk_widget_error_bell (widget);
 510
 511           return TRUE;
 512         }
 513     }
 514
 515   edited = TRUE;
 516
 517  out:
 518   gtk_device_grab_remove (priv->grab_widget, priv->grab_pointer);
 519   gdk_device_ungrab (priv->grab_keyboard, event->time);
 520   gdk_device_ungrab (priv->grab_pointer, event->time);
 521
 522   path = g_strdup (g_object_get_data (G_OBJECT (priv->edit_widget), "gtk-cell-renderer-text"));
 523
 524   gtk_cell_editable_editing_done (GTK_CELL_EDITABLE (priv->edit_widget));
 525   gtk_cell_editable_remove_widget (GTK_CELL_EDITABLE (priv->edit_widget));
 526   priv->edit_widget = NULL;
 527   priv->grab_widget = NULL;
 528   priv->grab_keyboard = NULL;
 529   priv->grab_pointer = NULL;
 530
 531   if (edited)
 532     g_signal_emit (accel, signals[ACCEL_EDITED], 0, path,
 533                    accel_key, accel_mods, event->hardware_keycode);
 534   else if (cleared)
 535     g_signal_emit (accel, signals[ACCEL_CLEARED], 0, path);
 536
 537   g_free (path);
 538
 539   return TRUE;
 540 }
 541
 542 static void
 543 ungrab_stuff (GtkWidget            *widget,
 544               GtkCellRendererAccel *accel)
 545 {
 546   GtkCellRendererAccelPrivate *priv = accel->priv;
 547
 548   gtk_device_grab_remove (priv->grab_widget, priv->grab_pointer);
 549   gdk_device_ungrab (priv->grab_keyboard, GDK_CURRENT_TIME);
 550   gdk_device_ungrab (priv->grab_pointer, GDK_CURRENT_TIME);
 551
 552   priv->grab_keyboard = NULL;
 553   priv->grab_pointer = NULL;
 554
 555   g_signal_handlers_disconnect_by_func (priv->grab_widget,
 556                                         G_CALLBACK (grab_key_callback),
 557                                         accel);
 558 }
 559
 560 static void
 561 _gtk_cell_editable_event_box_start_editing (GtkCellEditable *cell_editable,
 562                                             GdkEvent        *event)
 563 {
 564   /* do nothing, because we are pointless */
 565 }
 566
 567 static void
 568 _gtk_cell_editable_event_box_cell_editable_init (GtkCellEditableIface *iface)
 569 {
 570   iface->start_editing = _gtk_cell_editable_event_box_start_editing;
 571 }
 572
 573 typedef struct _GtkCellEditableEventBox GtkCellEditableEventBox;
 574 typedef         GtkEventBoxClass        GtkCellEditableEventBoxClass;
 575
 576 struct _GtkCellEditableEventBox
 577 {
 578   GtkEventBox box;
 579   gboolean editing_canceled;
 580 };
 581
 582 GType _gtk_cell_editable_event_box_get_type (void);
 583
 584 G_DEFINE_TYPE_WITH_CODE (GtkCellEditableEventBox, _gtk_cell_editable_event_box, GTK_TYPE_EVENT_BOX, { \
 585     G_IMPLEMENT_INTERFACE (GTK_TYPE_CELL_EDITABLE, _gtk_cell_editable_event_box_cell_editable_init)   \
 586       })
 587
 588 enum {
 589   PROP_ZERO,
 590   PROP_EDITING_CANCELED
 591 };
 592
 593 static void
 594 gtk_cell_editable_event_box_set_property (GObject      *object,
 595                                           guint         prop_id,
 596                                           const GValue *value,
 597                                           GParamSpec   *pspec)
 598 {
 599   GtkCellEditableEventBox *box = (GtkCellEditableEventBox*)object;
 600
 601   switch (prop_id)
 602     {
 603     case PROP_EDITING_CANCELED:
 604       box->editing_canceled = g_value_get_boolean (value);
 605       break;
 606     default:
 607       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
 608       break;
 609     }
 610 }
 611
 612 static void
 613 gtk_cell_editable_event_box_get_property (GObject    *object,
 614                                           guint       prop_id,
 615                                           GValue     *value,
 616                                           GParamSpec *pspec)
 617 {
 618   GtkCellEditableEventBox *box = (GtkCellEditableEventBox*)object;
 619
 620   switch (prop_id)
 621     {
 622     case PROP_EDITING_CANCELED:
 623       g_value_set_boolean (value, box->editing_canceled);
 624       break;
 625     default:
 626       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
 627       break;
 628     }
 629 }
 630
 631 static void
 632 _gtk_cell_editable_event_box_class_init (GtkCellEditableEventBoxClass *class)
 633 {
 634   GObjectClass *gobject_class = G_OBJECT_CLASS (class);
 635
 636   gobject_class->set_property = gtk_cell_editable_event_box_set_property;
 637   gobject_class->get_property = gtk_cell_editable_event_box_get_property;
 638
 639   g_object_class_override_property (gobject_class,
 640                                     PROP_EDITING_CANCELED,
 641                                     "editing-canceled");
 642 }
 643
 644 static void
 645 _gtk_cell_editable_event_box_init (GtkCellEditableEventBox *box)
 646 {
 647 }
 648
 649 static GtkCellEditable *
 650 gtk_cell_renderer_accel_start_editing (GtkCellRenderer      *cell,
 651                                        GdkEvent             *event,
 652                                        GtkWidget            *widget,
 653                                        const gchar          *path,
 654                                        const GdkRectangle   *background_area,
 655                                        const GdkRectangle   *cell_area,
 656                                        GtkCellRendererState  flags)
 657 {
 658   GtkCellRendererAccelPrivate *priv;
 659   GtkCellRendererText *celltext;
 660   GtkCellRendererAccel *accel;
 661   GtkStyleContext *context;
 662   GdkRGBA color;
 663   GtkWidget *label;
 664   GtkWidget *eventbox;
 665   GdkDevice *device, *keyb, *pointer;
 666   GdkWindow *window;
 667   gboolean editable;
 668   guint32 time;
 669
 670   celltext = GTK_CELL_RENDERER_TEXT (cell);
 671   accel = GTK_CELL_RENDERER_ACCEL (cell);
 672   priv = accel->priv;
 673
 674   /* If the cell isn't editable we return NULL. */
 675   g_object_get (celltext, "editable", &editable, NULL);
 676   if (editable == FALSE)
 677     return NULL;
 678
 679   window = gtk_widget_get_window (widget);
 680   context = gtk_widget_get_style_context (widget);
 681
 682   g_return_val_if_fail (window != NULL, NULL);
 683
 684   if (event)
 685     device = gdk_event_get_device (event);
 686   else
 687     device = gtk_get_current_event_device ();
 688
 689   if (!device)
 690     return NULL;
 691
 692   if (gdk_device_get_source (device) == GDK_SOURCE_KEYBOARD)
 693     {
 694       keyb = device;
 695       pointer = gdk_device_get_associated_device (device);
 696     }
 697   else
 698     {
 699       pointer = device;
 700       keyb = gdk_device_get_associated_device (device);
 701     }
 702
 703   time = gdk_event_get_time (event);
 704
 705   if (gdk_device_grab (keyb, window,
 706                        GDK_OWNERSHIP_WINDOW, FALSE,
 707                        GDK_KEY_PRESS_MASK | GDK_KEY_RELEASE_MASK,
 708                        NULL, time) != GDK_GRAB_SUCCESS)
 709     return NULL;
 710
 711   if (gdk_device_grab (pointer, window,
 712                        GDK_OWNERSHIP_WINDOW, FALSE,
 713                        GDK_BUTTON_PRESS_MASK,
 714                        NULL, time) != GDK_GRAB_SUCCESS)
 715     {
 716       gdk_device_ungrab (keyb, time);
 717       return NULL;
 718     }
 719
 720   priv->grab_keyboard = keyb;
 721   priv->grab_pointer = pointer;
 722   priv->grab_widget = widget;
 723
 724   g_signal_connect (G_OBJECT (widget), "key-press-event",
 725                     G_CALLBACK (grab_key_callback),
 726                     accel);
 727
 728   eventbox = g_object_new (_gtk_cell_editable_event_box_get_type (), NULL);
 729   priv->edit_widget = eventbox;
 730   g_object_add_weak_pointer (G_OBJECT (priv->edit_widget),
 731                              (gpointer) &priv->edit_widget);
 732
 733   label = gtk_label_new (NULL);
 734   gtk_widget_set_halign (label, GTK_ALIGN_START);
 735   gtk_widget_set_valign (label, GTK_ALIGN_CENTER);
 736
 737   gtk_style_context_get_background_color (context, GTK_STATE_FLAG_SELECTED, &color);
 738   gtk_widget_override_background_color (eventbox, 0, &color);
 739
 740   gtk_style_context_get_color (context, GTK_STATE_FLAG_SELECTED, &color);
 741   gtk_widget_override_color (label, 0, &color);
 742
 743   /* This label is displayed in a treeview cell displaying
 744    * an accelerator when the cell is clicked to change the
 745    * acelerator.
 746    */
 747   gtk_label_set_text (GTK_LABEL (label), _("New accelerator…"));
 748
 749   gtk_container_add (GTK_CONTAINER (eventbox), label);
 750
 751   g_object_set_data_full (G_OBJECT (priv->edit_widget), "gtk-cell-renderer-text",
 752                           g_strdup (path), g_free);
 753
 754   gtk_widget_show_all (priv->edit_widget);
 755
 756   gtk_device_grab_add (priv->grab_widget, pointer, TRUE);
 757
 758   g_signal_connect (priv->edit_widget, "unrealize",
 759                     G_CALLBACK (ungrab_stuff), accel);
 760
 761   return GTK_CELL_EDITABLE (priv->edit_widget);
 762 }