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, write to the
  16  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  17  * Boston, MA 02111-1307, USA.
  18  */
  19
  20 #include "config.h"
  21
  22 #include "gtkcellrendereraccel.h"
  23
  24 #include "gtkintl.h"
  25 #include "gtkaccelgroup.h"
  26 #include "gtkmarshalers.h"
  27 #include "gtklabel.h"
  28 #include "gtkeventbox.h"
  29 #include "gtkmain.h"
  30 #include "gtksizerequest.h"
  31 #include "gtktypebuiltins.h"
  32 #include "gtkprivate.h"
  33
  34
  35 /**
  36  * SECTION:gtkcellrendereraccel
  37  * @Short_description: Renders a keyboard accelerator in a cell
  38  * @Title: GtkCellRendererAccel
  39  *
  40  * #GtkCellRendererAccel displays a keyboard accelerator (i.e. a
  41  * key combination like <keycombo><keycap>Control</keycap><keycap>a</keycap></keycombo>.
  42  * If the cell renderer is editable, the accelerator can be changed by
  43  * simply typing the new combination.
  44  *
  45  * The #GtkCellRendererAccel cell renderer was added in GTK+ 2.10.
  46  */
  47
  48
  49
  50 static void gtk_cell_renderer_accel_get_property (GObject         *object,
  51                                                   guint            param_id,
  52                                                   GValue          *value,
  53                                                   GParamSpec      *pspec);
  54 static void gtk_cell_renderer_accel_set_property (GObject         *object,
  55                                                   guint            param_id,
  56                                                   const GValue    *value,
  57                                                   GParamSpec      *pspec);
  58 static void gtk_cell_renderer_accel_get_size     (GtkCellRenderer    *cell,
  59                                                   GtkWidget          *widget,
  60                                                   const GdkRectangle *cell_area,
  61                                                   gint               *x_offset,
  62                                                   gint               *y_offset,
  63                                                   gint               *width,
  64                                                   gint               *height);
  65 static GtkCellEditable *
  66            gtk_cell_renderer_accel_start_editing (GtkCellRenderer      *cell,
  67                                                   GdkEvent             *event,
  68                                                   GtkWidget            *widget,
  69                                                   const gchar          *path,
  70                                                   const GdkRectangle   *background_area,
  71                                                   const GdkRectangle   *cell_area,
  72                                                   GtkCellRendererState  flags);
  73 static gchar *convert_keysym_state_to_string     (GtkCellRendererAccel *accel,
  74                                                   guint                 keysym,
  75                                                   GdkModifierType       mask,
  76                                                   guint                 keycode);
  77
  78 enum {
  79   ACCEL_EDITED,
  80   ACCEL_CLEARED,
  81   LAST_SIGNAL
  82 };
  83
  84 enum {
  85   PROP_0,
  86   PROP_ACCEL_KEY,
  87   PROP_ACCEL_MODS,
  88   PROP_KEYCODE,
  89   PROP_ACCEL_MODE
  90 };
  91
  92 struct _GtkCellRendererAccelPrivate
  93 {
  94   GtkWidget *edit_widget;
  95   GtkWidget *grab_widget;
  96   GtkWidget *sizing_label;
  97
  98   GdkDevice *grab_keyboard;
  99   GdkDevice *grab_pointer;
 100
 101   GtkCellRendererAccelMode accel_mode;
 102
 103   GdkModifierType accel_mods;
 104
 105   guint accel_key;
 106   guint keycode;
 107 };
 108
 109 static guint signals[LAST_SIGNAL] = { 0 };
 110
 111 G_DEFINE_TYPE (GtkCellRendererAccel, gtk_cell_renderer_accel, GTK_TYPE_CELL_RENDERER_TEXT)
 112
 113 static void
 114 gtk_cell_renderer_accel_init (GtkCellRendererAccel *cell_accel)
 115 {
 116   gchar *text;
 117
 118   cell_accel->priv = G_TYPE_INSTANCE_GET_PRIVATE (cell_accel,
 119                                                   GTK_TYPE_CELL_RENDERER_ACCEL,
 120                                                   GtkCellRendererAccelPrivate);
 121
 122   text = convert_keysym_state_to_string (cell_accel, 0, 0, 0);
 123   g_object_set (cell_accel, "text", text, NULL);
 124   g_free (text);
 125 }
 126
 127 static void
 128 gtk_cell_renderer_accel_class_init (GtkCellRendererAccelClass *cell_accel_class)
 129 {
 130   GObjectClass *object_class;
 131   GtkCellRendererClass *cell_renderer_class;
 132
 133   object_class = G_OBJECT_CLASS (cell_accel_class);
 134   cell_renderer_class = GTK_CELL_RENDERER_CLASS (cell_accel_class);
 135
 136   object_class->set_property = gtk_cell_renderer_accel_set_property;
 137   object_class->get_property = gtk_cell_renderer_accel_get_property;
 138
 139   cell_renderer_class->get_size      = gtk_cell_renderer_accel_get_size;
 140   cell_renderer_class->start_editing = gtk_cell_renderer_accel_start_editing;
 141
 142   /**
 143    * GtkCellRendererAccel:accel-key:
 144    *
 145    * The keyval of the accelerator.
 146    *
 147    * Since: 2.10
 148    */
 149   g_object_class_install_property (object_class,
 150                                    PROP_ACCEL_KEY,
 151                                    g_param_spec_uint ("accel-key",
 152                                                      P_("Accelerator key"),
 153                                                      P_("The keyval of the accelerator"),
 154                                                       0,
 155                                                       G_MAXINT,
 156                                                       0,
 157                                                       GTK_PARAM_READWRITE));
 158
 159   /**
 160    * GtkCellRendererAccel:accel-mods:
 161    *
 162    * The modifier mask of the accelerator.
 163    *
 164    * Since: 2.10
 165    */
 166   g_object_class_install_property (object_class,
 167                                    PROP_ACCEL_MODS,
 168                                    g_param_spec_flags ("accel-mods",
 169                                                        P_("Accelerator modifiers"),
 170                                                        P_("The modifier mask of the accelerator"),
 171                                                        GDK_TYPE_MODIFIER_TYPE,
 172                                                        0,
 173                                                        GTK_PARAM_READWRITE));
 174
 175   /**
 176    * GtkCellRendererAccel:keycode:
 177    *
 178    * The hardware keycode of the accelerator. Note that the hardware keycode is
 179    * only relevant if the key does not have a keyval. Normally, the keyboard
 180    * configuration should assign keyvals to all keys.
 181    *
 182    * Since: 2.10
 183    */
 184   g_object_class_install_property (object_class,
 185                                    PROP_KEYCODE,
 186                                    g_param_spec_uint ("keycode",
 187                                                       P_("Accelerator keycode"),
 188                                                       P_("The hardware keycode of the accelerator"),
 189                                                       0,
 190                                                       G_MAXINT,
 191                                                       0,
 192                                                       GTK_PARAM_READWRITE));
 193
 194   /**
 195    * GtkCellRendererAccel:accel-mode:
 196    *
 197    * Determines if the edited accelerators are GTK+ accelerators. If
 198    * they are, consumed modifiers are suppressed, only accelerators
 199    * accepted by GTK+ are allowed, and the accelerators are rendered
 200    * in the same way as they are in menus.
 201    *
 202    * Since: 2.10
 203    */
 204   g_object_class_install_property (object_class,
 205                                    PROP_ACCEL_MODE,
 206                                    g_param_spec_enum ("accel-mode",
 207                                                       P_("Accelerator Mode"),
 208                                                       P_("The type of accelerators"),
 209                                                       GTK_TYPE_CELL_RENDERER_ACCEL_MODE,
 210                                                       GTK_CELL_RENDERER_ACCEL_MODE_GTK,
 211                                                       GTK_PARAM_READWRITE));
 212
 213   /**
 214    * GtkCellRendererAccel::accel-edited:
 215    * @accel: the object reveiving the signal
 216    * @path_string: the path identifying the row of the edited cell
 217    * @accel_key: the new accelerator keyval
 218    * @accel_mods: the new acclerator modifier mask
 219    * @hardware_keycode: the keycode of the new accelerator
 220    *
 221    * Gets emitted when the user has selected a new accelerator.
 222    *
 223    * Since: 2.10
 224    */
 225   signals[ACCEL_EDITED] = g_signal_new (I_("accel-edited"),
 226                                         GTK_TYPE_CELL_RENDERER_ACCEL,
 227                                         G_SIGNAL_RUN_LAST,
 228                                         G_STRUCT_OFFSET (GtkCellRendererAccelClass, accel_edited),
 229                                         NULL, NULL,
 230                                         _gtk_marshal_VOID__STRING_UINT_FLAGS_UINT,
 231                                         G_TYPE_NONE, 4,
 232                                         G_TYPE_STRING,
 233                                         G_TYPE_UINT,
 234                                         GDK_TYPE_MODIFIER_TYPE,
 235                                         G_TYPE_UINT);
 236
 237   /**
 238    * GtkCellRendererAccel::accel-cleared:
 239    * @accel: the object reveiving the signal
 240    * @path_string: the path identifying the row of the edited cell
 241    *
 242    * Gets emitted when the user has removed the accelerator.
 243    *
 244    * Since: 2.10
 245    */
 246   signals[ACCEL_CLEARED] = g_signal_new (I_("accel-cleared"),
 247                                          GTK_TYPE_CELL_RENDERER_ACCEL,
 248                                          G_SIGNAL_RUN_LAST,
 249                                          G_STRUCT_OFFSET (GtkCellRendererAccelClass, accel_cleared),
 250                                          NULL, NULL,
 251                                          g_cclosure_marshal_VOID__STRING,
 252                                          G_TYPE_NONE, 1,
 253                                          G_TYPE_STRING);
 254
 255   g_type_class_add_private (cell_accel_class, sizeof (GtkCellRendererAccelPrivate));
 256 }
 257
 258
 259 /**
 260  * gtk_cell_renderer_accel_new:
 261  *
 262  * Creates a new #GtkCellRendererAccel.
 263  *
 264  * Returns: the new cell renderer
 265  *
 266  * Since: 2.10
 267  */
 268 GtkCellRenderer *
 269 gtk_cell_renderer_accel_new (void)
 270 {
 271   return g_object_new (GTK_TYPE_CELL_RENDERER_ACCEL, NULL);
 272 }
 273
 274 static gchar *
 275 convert_keysym_state_to_string (GtkCellRendererAccel *accel,
 276                                 guint                 keysym,
 277                                 GdkModifierType       mask,
 278                                 guint                 keycode)
 279 {
 280   GtkCellRendererAccelPrivate *priv = accel->priv;
 281
 282   if (keysym == 0 && keycode == 0)
 283     /* This label is displayed in a treeview cell displaying
 284      * a disabled accelerator key combination.
 285      */
 286     return g_strdup (C_("Accelerator", "Disabled"));
 287   else
 288     {
 289       if (priv->accel_mode == GTK_CELL_RENDERER_ACCEL_MODE_GTK)
 290         {
 291           if (!gtk_accelerator_valid (keysym, mask))
 292             /* This label is displayed in a treeview cell displaying
 293              * an accelerator key combination that is not valid according
 294              * to gtk_accelerator_valid().
 295              */
 296             return g_strdup (C_("Accelerator", "Invalid"));
 297
 298           return gtk_accelerator_get_label (keysym, mask);
 299         }
 300       else
 301         {
 302           gchar *name;
 303
 304           name = gtk_accelerator_get_label_with_keycode (NULL, keysym, keycode, mask);
 305           if (name == NULL)
 306             name = gtk_accelerator_name_with_keycode (NULL, keysym, keycode, mask);
 307
 308           return name;
 309         }
 310     }
 311 }
 312
 313 static void
 314 gtk_cell_renderer_accel_get_property  (GObject    *object,
 315                                        guint       param_id,
 316                                        GValue     *value,
 317                                        GParamSpec *pspec)
 318 {
 319   GtkCellRendererAccelPrivate *priv = GTK_CELL_RENDERER_ACCEL (object)->priv;
 320
 321   switch (param_id)
 322     {
 323     case PROP_ACCEL_KEY:
 324       g_value_set_uint (value, priv->accel_key);
 325       break;
 326
 327     case PROP_ACCEL_MODS:
 328       g_value_set_flags (value, priv->accel_mods);
 329       break;
 330
 331     case PROP_KEYCODE:
 332       g_value_set_uint (value, priv->keycode);
 333       break;
 334
 335     case PROP_ACCEL_MODE:
 336       g_value_set_enum (value, priv->accel_mode);
 337       break;
 338
 339     default:
 340       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, param_id, pspec);
 341     }
 342 }
 343
 344 static void
 345 gtk_cell_renderer_accel_set_property  (GObject      *object,
 346                                        guint         param_id,
 347                                        const GValue *value,
 348                                        GParamSpec   *pspec)
 349 {
 350   GtkCellRendererAccel *accel = GTK_CELL_RENDERER_ACCEL (object);
 351   GtkCellRendererAccelPrivate *priv = accel->priv;
 352   gboolean changed = FALSE;
 353
 354   switch (param_id)
 355     {
 356     case PROP_ACCEL_KEY:
 357       {
 358         guint accel_key = g_value_get_uint (value);
 359
 360         if (priv->accel_key != accel_key)
 361           {
 362             priv->accel_key = accel_key;
 363             changed = TRUE;
 364           }
 365       }
 366       break;
 367
 368     case PROP_ACCEL_MODS:
 369       {
 370         guint accel_mods = g_value_get_flags (value);
 371
 372         if (priv->accel_mods != accel_mods)
 373           {
 374             priv->accel_mods = accel_mods;
 375             changed = TRUE;
 376           }
 377       }
 378       break;
 379     case PROP_KEYCODE:
 380       {
 381         guint keycode = g_value_get_uint (value);
 382
 383         if (priv->keycode != keycode)
 384           {
 385             priv->keycode = keycode;
 386             changed = TRUE;
 387           }
 388       }
 389       break;
 390
 391     case PROP_ACCEL_MODE:
 392       priv->accel_mode = g_value_get_enum (value);
 393       break;
 394
 395     default:
 396       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, param_id, pspec);
 397     }
 398
 399   if (changed)
 400     {
 401       gchar *text;
 402
 403       text = convert_keysym_state_to_string (accel, priv->accel_key, priv->accel_mods, priv->keycode);
 404       g_object_set (accel, "text", text, NULL);
 405       g_free (text);
 406     }
 407 }
 408
 409 static void
 410 gtk_cell_renderer_accel_get_size (GtkCellRenderer    *cell,
 411                                   GtkWidget          *widget,
 412                                   const GdkRectangle *cell_area,
 413                                   gint               *x_offset,
 414                                   gint               *y_offset,
 415                                   gint               *width,
 416                                   gint               *height)
 417
 418 {
 419   GtkCellRendererAccelPrivate *priv = GTK_CELL_RENDERER_ACCEL (cell)->priv;
 420   GtkRequisition requisition;
 421
 422   if (priv->sizing_label == NULL)
 423     priv->sizing_label = gtk_label_new (_("New accelerator..."));
 424
 425   gtk_widget_get_preferred_size (priv->sizing_label, &requisition, NULL);
 426
 427   GTK_CELL_RENDERER_CLASS (gtk_cell_renderer_accel_parent_class)->get_size (cell, widget, cell_area,
 428                                                                             x_offset, y_offset, width, height);
 429
 430   /* FIXME: need to take the cell_area et al. into account */
 431   if (width)
 432     *width = MAX (*width, requisition.width);
 433   if (height)
 434     *height = MAX (*height, requisition.height);
 435 }
 436
 437 static gboolean
 438 grab_key_callback (GtkWidget            *widget,
 439                    GdkEventKey          *event,
 440                    GtkCellRendererAccel *accel)
 441 {
 442   GtkCellRendererAccelPrivate *priv = accel->priv;
 443   GdkModifierType accel_mods = 0;
 444   guint accel_key;
 445   guint keyval;
 446   gchar *path;
 447   gboolean edited;
 448   gboolean cleared;
 449   GdkModifierType consumed_modifiers;
 450   GdkDisplay *display;
 451
 452   display = gtk_widget_get_display (widget);
 453
 454   if (event->is_modifier)
 455     return TRUE;
 456
 457   edited = FALSE;
 458   cleared = FALSE;
 459
 460   accel_mods = event->state;
 461
 462   _gtk_translate_keyboard_accel_state (gdk_keymap_get_for_display (display),
 463                                        event->hardware_keycode,
 464                                        event->state,
 465                                        gtk_accelerator_get_default_mod_mask (),
 466                                        event->group,
 467                                        &keyval, NULL, NULL, &consumed_modifiers);
 468
 469   accel_key = gdk_keyval_to_lower (keyval);
 470   if (accel_key == GDK_KEY_ISO_Left_Tab)
 471     accel_key = GDK_KEY_Tab;
 472
 473   accel_mods &= gtk_accelerator_get_default_mod_mask ();
 474
 475   /* Filter consumed modifiers
 476    */
 477   if (priv->accel_mode == GTK_CELL_RENDERER_ACCEL_MODE_GTK)
 478     accel_mods &= ~consumed_modifiers;
 479
 480   /* Put shift back if it changed the case of the key, not otherwise.
 481    */
 482   if (accel_key != keyval)
 483     accel_mods |= GDK_SHIFT_MASK;
 484
 485   if (accel_mods == 0)
 486     {
 487       switch (keyval)
 488         {
 489         case GDK_KEY_Escape:
 490           goto out; /* cancel */
 491         case GDK_KEY_BackSpace:
 492           /* clear the accelerator on Backspace */
 493           cleared = TRUE;
 494           goto out;
 495         default:
 496           break;
 497         }
 498     }
 499
 500   if (priv->accel_mode == GTK_CELL_RENDERER_ACCEL_MODE_GTK)
 501     {
 502       if (!gtk_accelerator_valid (accel_key, accel_mods))
 503         {
 504           gtk_widget_error_bell (widget);
 505
 506           return TRUE;
 507         }
 508     }
 509
 510   edited = TRUE;
 511
 512  out:
 513   gtk_device_grab_remove (priv->grab_widget, priv->grab_pointer);
 514   gdk_device_ungrab (priv->grab_keyboard, event->time);
 515   gdk_device_ungrab (priv->grab_pointer, event->time);
 516
 517   path = g_strdup (g_object_get_data (G_OBJECT (priv->edit_widget), "gtk-cell-renderer-text"));
 518
 519   gtk_cell_editable_editing_done (GTK_CELL_EDITABLE (priv->edit_widget));
 520   gtk_cell_editable_remove_widget (GTK_CELL_EDITABLE (priv->edit_widget));
 521   priv->edit_widget = NULL;
 522   priv->grab_widget = NULL;
 523   priv->grab_keyboard = NULL;
 524   priv->grab_pointer = NULL;
 525
 526   if (edited)
 527     g_signal_emit (accel, signals[ACCEL_EDITED], 0, path,
 528                    accel_key, accel_mods, event->hardware_keycode);
 529   else if (cleared)
 530     g_signal_emit (accel, signals[ACCEL_CLEARED], 0, path);
 531
 532   g_free (path);
 533
 534   return TRUE;
 535 }
 536
 537 static void
 538 ungrab_stuff (GtkWidget            *widget,
 539               GtkCellRendererAccel *accel)
 540 {
 541   GtkCellRendererAccelPrivate *priv = accel->priv;
 542
 543   gtk_device_grab_remove (priv->grab_widget, priv->grab_pointer);
 544   gdk_device_ungrab (priv->grab_keyboard, GDK_CURRENT_TIME);
 545   gdk_device_ungrab (priv->grab_pointer, GDK_CURRENT_TIME);
 546
 547   priv->grab_keyboard = NULL;
 548   priv->grab_pointer = NULL;
 549
 550   g_signal_handlers_disconnect_by_func (priv->grab_widget,
 551                                         G_CALLBACK (grab_key_callback),
 552                                         accel);
 553 }
 554
 555 static void
 556 _gtk_cell_editable_event_box_start_editing (GtkCellEditable *cell_editable,
 557                                             GdkEvent        *event)
 558 {
 559   /* do nothing, because we are pointless */
 560 }
 561
 562 static void
 563 _gtk_cell_editable_event_box_cell_editable_init (GtkCellEditableIface *iface)
 564 {
 565   iface->start_editing = _gtk_cell_editable_event_box_start_editing;
 566 }
 567
 568 typedef struct _GtkCellEditableEventBox GtkCellEditableEventBox;
 569 typedef         GtkEventBoxClass        GtkCellEditableEventBoxClass;
 570
 571 struct _GtkCellEditableEventBox
 572 {
 573   GtkEventBox box;
 574   gboolean editing_canceled;
 575 };
 576
 577 G_DEFINE_TYPE_WITH_CODE (GtkCellEditableEventBox, _gtk_cell_editable_event_box, GTK_TYPE_EVENT_BOX, { \
 578     G_IMPLEMENT_INTERFACE (GTK_TYPE_CELL_EDITABLE, _gtk_cell_editable_event_box_cell_editable_init)   \
 579       })
 580
 581 enum {
 582   PROP_ZERO,
 583   PROP_EDITING_CANCELED
 584 };
 585
 586 static void
 587 gtk_cell_editable_event_box_set_property (GObject      *object,
 588                                           guint         prop_id,
 589                                           const GValue *value,
 590                                           GParamSpec   *pspec)
 591 {
 592   GtkCellEditableEventBox *box = (GtkCellEditableEventBox*)object;
 593
 594   switch (prop_id)
 595     {
 596     case PROP_EDITING_CANCELED:
 597       box->editing_canceled = g_value_get_boolean (value);
 598       break;
 599     default:
 600       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
 601       break;
 602     }
 603 }
 604
 605 static void
 606 gtk_cell_editable_event_box_get_property (GObject    *object,
 607                                           guint       prop_id,
 608                                           GValue     *value,
 609                                           GParamSpec *pspec)
 610 {
 611   GtkCellEditableEventBox *box = (GtkCellEditableEventBox*)object;
 612
 613   switch (prop_id)
 614     {
 615     case PROP_EDITING_CANCELED:
 616       g_value_set_boolean (value, box->editing_canceled);
 617       break;
 618     default:
 619       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
 620       break;
 621     }
 622 }
 623
 624 static void
 625 _gtk_cell_editable_event_box_class_init (GtkCellEditableEventBoxClass *class)
 626 {
 627   GObjectClass *gobject_class = G_OBJECT_CLASS (class);
 628
 629   gobject_class->set_property = gtk_cell_editable_event_box_set_property;
 630   gobject_class->get_property = gtk_cell_editable_event_box_get_property;
 631
 632   g_object_class_override_property (gobject_class,
 633                                     PROP_EDITING_CANCELED,
 634                                     "editing-canceled");
 635 }
 636
 637 static void
 638 _gtk_cell_editable_event_box_init (GtkCellEditableEventBox *box)
 639 {
 640 }
 641
 642 static GtkCellEditable *
 643 gtk_cell_renderer_accel_start_editing (GtkCellRenderer      *cell,
 644                                        GdkEvent             *event,
 645                                        GtkWidget            *widget,
 646                                        const gchar          *path,
 647                                        const GdkRectangle   *background_area,
 648                                        const GdkRectangle   *cell_area,
 649                                        GtkCellRendererState  flags)
 650 {
 651   GtkCellRendererAccelPrivate *priv;
 652   GtkCellRendererText *celltext;
 653   GtkCellRendererAccel *accel;
 654   GtkStyleContext *context;
 655   GdkRGBA color;
 656   GtkWidget *label;
 657   GtkWidget *eventbox;
 658   GdkDevice *device, *keyb, *pointer;
 659   GdkWindow *window;
 660   gboolean editable;
 661   guint32 time;
 662
 663   celltext = GTK_CELL_RENDERER_TEXT (cell);
 664   accel = GTK_CELL_RENDERER_ACCEL (cell);
 665   priv = accel->priv;
 666
 667   /* If the cell isn't editable we return NULL. */
 668   g_object_get (celltext, "editable", &editable, NULL);
 669   if (editable == FALSE)
 670     return NULL;
 671
 672   window = gtk_widget_get_window (widget);
 673   context = gtk_widget_get_style_context (widget);
 674
 675   g_return_val_if_fail (window != NULL, NULL);
 676
 677   if (event)
 678     device = gdk_event_get_device (event);
 679   else
 680     device = gtk_get_current_event_device ();
 681
 682   if (!device)
 683     return NULL;
 684
 685   if (gdk_device_get_source (device) == GDK_SOURCE_KEYBOARD)
 686     {
 687       keyb = device;
 688       pointer = gdk_device_get_associated_device (device);
 689     }
 690   else
 691     {
 692       pointer = device;
 693       keyb = gdk_device_get_associated_device (device);
 694     }
 695
 696   time = gdk_event_get_time (event);
 697
 698   if (gdk_device_grab (keyb, window,
 699                        GDK_OWNERSHIP_WINDOW, FALSE,
 700                        GDK_KEY_PRESS_MASK | GDK_KEY_RELEASE_MASK,
 701                        NULL, time) != GDK_GRAB_SUCCESS)
 702     return NULL;
 703
 704   if (gdk_device_grab (pointer, window,
 705                        GDK_OWNERSHIP_WINDOW, FALSE,
 706                        GDK_BUTTON_PRESS_MASK,
 707                        NULL, time) != GDK_GRAB_SUCCESS)
 708     {
 709       gdk_device_ungrab (keyb, time);
 710       return NULL;
 711     }
 712
 713   priv->grab_keyboard = keyb;
 714   priv->grab_pointer = pointer;
 715   priv->grab_widget = widget;
 716
 717   g_signal_connect (G_OBJECT (widget), "key-press-event",
 718                     G_CALLBACK (grab_key_callback),
 719                     accel);
 720
 721   eventbox = g_object_new (_gtk_cell_editable_event_box_get_type (), NULL);
 722   priv->edit_widget = eventbox;
 723   g_object_add_weak_pointer (G_OBJECT (priv->edit_widget),
 724                              (gpointer) &priv->edit_widget);
 725
 726   label = gtk_label_new (NULL);
 727   gtk_widget_set_halign (label, GTK_ALIGN_START);
 728   gtk_widget_set_valign (label, GTK_ALIGN_CENTER);
 729
 730   gtk_style_context_get_background_color (context, GTK_STATE_FLAG_SELECTED, &color);
 731   gtk_widget_override_background_color (label, 0, &color);
 732
 733   gtk_style_context_get_color (context, GTK_STATE_FLAG_SELECTED, &color);
 734   gtk_widget_override_color (label, 0, &color);
 735
 736   /* This label is displayed in a treeview cell displaying
 737    * an accelerator when the cell is clicked to change the
 738    * acelerator.
 739    */
 740   gtk_label_set_text (GTK_LABEL (label), _("New accelerator..."));
 741
 742   gtk_container_add (GTK_CONTAINER (eventbox), label);
 743
 744   g_object_set_data_full (G_OBJECT (priv->edit_widget), "gtk-cell-renderer-text",
 745                           g_strdup (path), g_free);
 746
 747   gtk_widget_show_all (priv->edit_widget);
 748
 749   gtk_device_grab_add (priv->grab_widget, pointer, TRUE);
 750
 751   g_signal_connect (priv->edit_widget, "unrealize",
 752                     G_CALLBACK (ungrab_stuff), accel);
 753
 754   return GTK_CELL_EDITABLE (priv->edit_widget);
 755 }