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