git.cworth.org Git - grrobot/blob - src/grr_board_view.c

   1 /* grr_board_view - GTK+ widget for displaying an rr_board
   2  *
   3  * Copyright © 2003 Carl Worth
   4  *
   5  * Permission to use, copy, modify, distribute, and sell this software
   6  * and its documentation for any purpose is hereby granted without
   7  * fee, provided that the above copyright notice appear in all copies
   8  * and that both that copyright notice and this permission notice
   9  * appear in supporting documentation, and that the name of Carl Worth
  10  * not be used in advertising or publicity pertaining to distribution
  11  * of the software without specific, written prior permission.
  12  * Carl Worth makes no representations about the suitability of this
  13  * software for any purpose.  It is provided "as is" without express
  14  * or implied warranty.
  15  *
  16  * CARL WORTH DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
  17  * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN
  18  * NO EVENT SHALL CARL WORTH BE LIABLE FOR ANY SPECIAL, INDIRECT OR
  19  * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS
  20  * OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT,
  21  * NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
  22  * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  23  *
  24  * Author: Carl Worth <carl@theworths.org>
  25  */
  26
  27 #include <math.h>
  28 #include <stdio.h>
  29 #include <stdlib.h>
  30 #include <string.h>
  31
  32 #include <cairo.h>
  33 #include <xsvg.h>
  34
  35 #include <gtk/gtkmain.h>
  36 #include <gtk/gtksignal.h>
  37 #include <gdk/gdkx.h>
  38
  39 #include "grr_board_view.h"
  40 #include "grr_icon.h"
  41 #include "grr_util.h"
  42
  43 #define SCROLL_DELAY_LENGTH  300
  44 #define GRR_BOARD_VIEW_DEFAULT_SIZE 100
  45
  46 #define GRR_SVG_ASSUMED_WIDTH 32.0
  47 #define GRR_SVG_ASSUMED_HEIGHT 32.0
  48
  49 /* Forward declarations */
  50
  51 static void grr_board_view_class_init               (grr_board_view_class_t    *klass);
  52 static void grr_board_view_init                     (grr_board_view_t         *view);
  53 static void grr_board_view_destroy                  (GtkObject        *object);
  54 static void grr_board_view_realize                  (GtkWidget        *widget);
  55 static void grr_board_view_size_request             (GtkWidget      *widget,
  56                                                      GtkRequisition *requisition);
  57 static void grr_board_view_size_allocate            (GtkWidget     *widget,
  58                                                      GtkAllocation *allocation);
  59 static gint grr_board_view_expose                   (GtkWidget        *widget,
  60                                                      GdkEventExpose   *event);
  61 static gint grr_board_view_button_press             (GtkWidget        *widget,
  62                                                      GdkEventButton   *event);
  63 static gint grr_board_view_button_release           (GtkWidget        *widget,
  64                                                      GdkEventButton   *event);
  65 static gint grr_board_view_motion_notify            (GtkWidget        *widget,
  66                                                      GdkEventMotion   *event);
  67
  68 static void grr_board_view_update_mouse             (grr_board_view_t *view, gint x, gint y);
  69
  70 /* Local data */
  71
  72 static GtkWidgetClass *parent_class = NULL;
  73
  74 GType
  75 grr_board_view_get_type ()
  76 {
  77   static GType view_type = 0;
  78
  79   if (!view_type)
  80     {
  81       static const GTypeInfo view_info =
  82       {
  83         sizeof (grr_board_view_class_t),
  84         NULL,
  85         NULL,
  86         (GClassInitFunc) grr_board_view_class_init,
  87         NULL,
  88         NULL,
  89         sizeof (grr_board_view_t),
  90         0,
  91         (GInstanceInitFunc) grr_board_view_init,
  92       };
  93
  94       view_type = g_type_register_static (GTK_TYPE_WIDGET, "grr_board_view", &view_info, 0);
  95     }
  96
  97   return view_type;
  98 }
  99
 100 static void
 101 grr_board_view_class_init (grr_board_view_class_t *class)
 102 {
 103     GtkObjectClass *object_class;
 104     GtkWidgetClass *widget_class;
 105
 106     object_class = (GtkObjectClass*) class;
 107     widget_class = (GtkWidgetClass*) class;
 108
 109     parent_class = gtk_type_class (gtk_widget_get_type ());
 110
 111     object_class->destroy = grr_board_view_destroy;
 112
 113     widget_class->realize = grr_board_view_realize;
 114     widget_class->expose_event = grr_board_view_expose;
 115     widget_class->size_request = grr_board_view_size_request;
 116     widget_class->size_allocate = grr_board_view_size_allocate;
 117     widget_class->button_press_event = grr_board_view_button_press;
 118     widget_class->button_release_event = grr_board_view_button_release;
 119     widget_class->motion_notify_event = grr_board_view_motion_notify;
 120 }
 121
 122 static void
 123 grr_board_view_init (grr_board_view_t *view)
 124 {
 125     int i;
 126     rr_robot_t robot;
 127     rr_target_t target;
 128
 129     view->board = NULL;
 130     view->client = NULL;
 131
 132     view->button = 0;
 133     view->timer = 0;
 134
 135     view->cell_width = 0;
 136     view->cell_height = 0;
 137
 138     view->cell1_icon = grr_icon_create ("cell1");
 139     view->cell2_icon = grr_icon_create ("cell2");
 140     view->wall_icon = grr_icon_create ("wall");
 141
 142     for (i=0; i < RR_NUM_ROBOTS; i++) {
 143         robot = rr_robot_from_idx (i);
 144         view->robot_icon[i] = grr_icon_create (grr_icon_robot_name (robot));
 145     }
 146
 147     for (i=0; i < RR_NUM_TARGETS; i++) {
 148         target = rr_target_from_idx (i);
 149         view->target_icon[i] = grr_icon_create (grr_icon_target_name (target));
 150     }
 151 }
 152
 153 grr_board_view_t *
 154 grr_board_view_new (rr_board_t *board)
 155 {
 156     grr_board_view_t *view;
 157     int x, y;
 158
 159     view = g_object_new (grr_board_view_get_type (), NULL);
 160
 161     view->board = board;
 162     rr_board_get_size (board, &view->board_width, &view->board_height);
 163
 164     view->damaged = malloc (view->board_height * sizeof (int *));
 165     for (y = 0; y < view->board_height; y++) {
 166         view->damaged[y] = malloc (view->board_width * sizeof (int));
 167         for (x = 0; x< view->board_width; x++) {
 168             view->damaged[y][x] = 1;
 169         }
 170     }
 171
 172     gtk_widget_queue_draw (GTK_WIDGET (view));
 173
 174     return view;
 175 }
 176
 177 void
 178 grr_board_view_set_client (grr_board_view_t *view, rr_client_t *client)
 179 {
 180     g_return_if_fail (view != NULL);
 181
 182     view->client = client;
 183 }
 184
 185 void
 186 grr_board_view_set_active_robot (grr_board_view_t *view, rr_robot_t robot)
 187 {
 188     g_return_if_fail (view != NULL);
 189
 190     view->active_robot = robot;
 191 }
 192
 193 void
 194 grr_board_view_move_active (grr_board_view_t *view, rr_direction_t dir)
 195 {
 196     if (view->client) {
 197         rr_client_move (view->client, view->active_robot, dir);
 198     } else {
 199         rr_board_move (view->board, view->active_robot, dir);
 200         gtk_widget_queue_draw (GTK_WIDGET (view));
 201     }
 202 }
 203
 204 void
 205 grr_board_view_undo (grr_board_view_t *view)
 206 {
 207     if (view->client) {
 208         rr_client_undo (view->client);
 209     } else {
 210         rr_board_undo (view->board);
 211         gtk_widget_queue_draw (GTK_WIDGET (view));
 212     }
 213 }
 214
 215 static void
 216 grr_board_view_destroy (GtkObject *object)
 217 {
 218     grr_board_view_t *view;
 219
 220     g_return_if_fail (object != NULL);
 221     g_return_if_fail (GRR_IS_BOARD_VIEW (object));
 222
 223     view = GRR_BOARD_VIEW (object);
 224
 225     view->board = NULL;
 226     view->client = NULL;
 227
 228     if (GTK_OBJECT_CLASS (parent_class)->destroy)
 229         (* GTK_OBJECT_CLASS (parent_class)->destroy) (object);
 230 }
 231
 232 static void
 233 grr_board_view_realize (GtkWidget *widget)
 234 {
 235     grr_board_view_t *view;
 236     GdkWindowAttr attributes;
 237     gint attributes_mask;
 238
 239     g_return_if_fail (widget != NULL);
 240     g_return_if_fail (GRR_IS_BOARD_VIEW (widget));
 241
 242     GTK_WIDGET_SET_FLAGS (widget, GTK_REALIZED);
 243     view = GRR_BOARD_VIEW (widget);
 244
 245     attributes.x = widget->allocation.x;
 246     attributes.y = widget->allocation.y;
 247     attributes.width = widget->allocation.width;
 248     attributes.height = widget->allocation.height;
 249     attributes.wclass = GDK_INPUT_OUTPUT;
 250     attributes.window_type = GDK_WINDOW_CHILD;
 251     attributes.event_mask = gtk_widget_get_events (widget) |
 252         GDK_EXPOSURE_MASK | GDK_BUTTON_PRESS_MASK |
 253         GDK_BUTTON_RELEASE_MASK | GDK_POINTER_MOTION_MASK |
 254         GDK_POINTER_MOTION_HINT_MASK;
 255     attributes.visual = gtk_widget_get_visual (widget);
 256     attributes.colormap = gtk_widget_get_colormap (widget);
 257
 258     attributes_mask = GDK_WA_X | GDK_WA_Y | GDK_WA_VISUAL | GDK_WA_COLORMAP;
 259     widget->window = gdk_window_new (widget->parent->window, &attributes, attributes_mask);
 260
 261     widget->style = gtk_style_attach (widget->style, widget->window);
 262
 263     gdk_window_set_user_data (widget->window, widget);
 264
 265     gtk_style_set_background (widget->style, widget->window, GTK_STATE_ACTIVE);
 266 }
 267
 268 static void
 269 grr_board_view_size_request (GtkWidget      *widget,
 270                        GtkRequisition *requisition)
 271 {
 272     requisition->width = GRR_BOARD_VIEW_DEFAULT_SIZE;
 273     requisition->height = GRR_BOARD_VIEW_DEFAULT_SIZE;
 274 }
 275
 276 static void
 277 grr_board_view_size_allocate (GtkWidget     *widget,
 278                         GtkAllocation *allocation)
 279 {
 280     grr_board_view_t *view;
 281
 282     g_return_if_fail (widget != NULL);
 283     g_return_if_fail (GRR_IS_BOARD_VIEW (widget));
 284     g_return_if_fail (allocation != NULL);
 285
 286     widget->allocation = *allocation;
 287     view = GRR_BOARD_VIEW (widget);
 288
 289     if (GTK_WIDGET_REALIZED (widget)) {
 290         gdk_window_move_resize (widget->window,
 291                                 allocation->x, allocation->y,
 292                                 allocation->width, allocation->height);
 293     }
 294 }
 295
 296 static void
 297 grr_board_view_draw_walls (grr_board_view_t     *view,
 298                            cairo_t              *xrs,
 299                            rr_wall_t            wall)
 300 {
 301     if (wall == RR_WALL_NONE)
 302         return;
 303
 304     if (wall & RR_WALL_ABOVE) {
 305         grr_icon_draw (view->wall_icon, xrs);
 306     }
 307     if (wall & RR_WALL_LEFT) {
 308         cairo_save (xrs);
 309         cairo_rotate (xrs, M_PI_2);
 310         grr_icon_draw (view->wall_icon, xrs);
 311         cairo_restore (xrs);
 312     }
 313     if (wall & RR_WALL_RIGHT) {
 314         cairo_save (xrs);
 315         cairo_translate (xrs, GRR_SVG_ASSUMED_WIDTH, 0);
 316         cairo_rotate (xrs, M_PI_2);
 317         grr_icon_draw (view->wall_icon, xrs);
 318         cairo_restore (xrs);
 319     }
 320     if (wall & RR_WALL_BELOW) {
 321         cairo_save (xrs);
 322         cairo_translate (xrs, 0, GRR_SVG_ASSUMED_HEIGHT);
 323         grr_icon_draw (view->wall_icon, xrs);
 324         cairo_restore (xrs);
 325     }
 326 }
 327
 328 static gint
 329 grr_board_view_expose (GtkWidget      *widget,
 330                        GdkEventExpose *event)
 331 {
 332     grr_board_view_t *view;
 333     rr_board_t *board;
 334     Display *dpy;
 335     Drawable drawable;
 336     cairo_t *xrs;
 337     GdkDrawable *real_drawable;
 338     gint x_off, y_off;
 339     int i, j;
 340     rr_target_t goal_target;
 341     int new_cell_width, new_cell_height;
 342
 343     g_return_val_if_fail (widget != NULL, FALSE);
 344     g_return_val_if_fail (GRR_IS_BOARD_VIEW (widget), FALSE);
 345     g_return_val_if_fail (event != NULL, FALSE);
 346
 347     view = GRR_BOARD_VIEW (widget);
 348     board = view->board;
 349
 350     /* Unabstract X from GTK+ */
 351     gdk_window_get_internal_paint_info (widget->window, &real_drawable, &x_off, &y_off);
 352     dpy = gdk_x11_drawable_get_xdisplay (real_drawable);
 353     drawable = gdk_x11_drawable_get_xid (real_drawable);
 354
 355     /* Ignore GTK+ and use Cairo for drawing. */
 356     xrs = cairo_create ();
 357     cairo_set_target_drawable (xrs, dpy, drawable);
 358
 359     new_cell_width = widget->allocation.width / view->board_width;
 360     if (new_cell_width == 0)
 361         new_cell_width = 1;
 362     new_cell_height = widget->allocation.height / view->board_height;
 363     if (new_cell_height == 0)
 364         new_cell_height = 1;
 365
 366     if (new_cell_width != view->cell_width
 367         || new_cell_height != view->cell_height) {
 368         int i;
 369         rr_robot_t robot;
 370         rr_target_t target;
 371
 372         view->cell_width = new_cell_width;
 373         view->cell_height = new_cell_height;
 374
 375         cairo_save (xrs);
 376         cairo_scale (xrs,
 377                  view->cell_width / GRR_SVG_ASSUMED_WIDTH,
 378                  view->cell_height / GRR_SVG_ASSUMED_HEIGHT);
 379
 380         grr_icon_predraw (view->cell1_icon, xrs,
 381                           view->cell_width, view->cell_height);
 382         grr_icon_predraw (view->cell2_icon, xrs,
 383                           view->cell_width, view->cell_height);
 384
 385         grr_icon_predraw (view->wall_icon, xrs,
 386                           view->cell_width, view->cell_height);
 387
 388         for (i=0; i < RR_NUM_ROBOTS; i++) {
 389             robot = rr_robot_from_idx (i);
 390             grr_icon_predraw (view->robot_icon[i], xrs,
 391                               view->cell_width, view->cell_height);
 392         }
 393
 394         for (i=0; i < RR_NUM_TARGETS; i++) {
 395             target = rr_target_from_idx (i);
 396             grr_icon_predraw (view->target_icon[i], xrs,
 397                               view->cell_width, view->cell_height);
 398         }
 399
 400         cairo_restore (xrs);
 401     }
 402
 403     view->cell_width = new_cell_width;
 404     view->cell_height = new_cell_height;
 405
 406     if (event->area.width) {
 407         int x_start, y_start;
 408         int x, y;
 409         int x_stop, y_stop;
 410         grr_board_view_transform_pixel_to_cell (view,
 411                                                 event->area.x, event->area.y,
 412                                                 &x_start, &y_start);
 413         grr_board_view_transform_pixel_to_cell (view,
 414                                                 event->area.x + event->area.width - 1,
 415                                                 event->area.y + event->area.height - 1,
 416                                                 &x_stop, &y_stop);
 417         for (y = y_start; y <= y_stop; y++)
 418             for (x = x_start; x <= x_stop; x++)
 419                 view->damaged[y][x] = 1;
 420     }
 421
 422     if (event->count > 0)
 423         return FALSE;
 424
 425     cairo_translate (xrs, -x_off, -y_off);
 426
 427     view->board_pad_x = (widget->allocation.width - view->board_width * view->cell_width) / 2;
 428     view->board_pad_y = (widget->allocation.height - view->board_height * view->cell_height) / 2;
 429
 430     cairo_translate (xrs, view->board_pad_x, view->board_pad_y);
 431
 432     goal_target = rr_board_get_goal_target (board);
 433
 434     /* Draw cell contents */
 435     for (j=0; j < view->board_height; j++) {
 436         for (i=0; i < view->board_width; i++) {
 437             if (! view->damaged[j][i])
 438                 continue;
 439             rr_cell_t cell = rr_board_get_cell (board, i, j);
 440             rr_target_t target = RR_CELL_GET_TARGET (cell);
 441             rr_robot_t robot = RR_CELL_GET_ROBOT (cell);
 442
 443             cairo_save (xrs);
 444             cairo_translate (xrs, i * view->cell_width, j * view->cell_height);
 445
 446             if ((i+j) % 2 == 0)
 447                 grr_icon_draw_predrawn (view->cell1_icon, xrs);
 448             else
 449                 grr_icon_draw_predrawn (view->cell2_icon, xrs);
 450
 451             if (target) {
 452                 if (target && target != goal_target) {
 453                     cairo_save (xrs);
 454                     cairo_set_alpha (xrs, .25);
 455                     cairo_set_operator (xrs, CAIRO_OPERATOR_XOR);
 456                     grr_icon_draw_predrawn (view->target_icon[rr_target_idx (target)], xrs);
 457                     cairo_set_alpha (xrs, 0.25);
 458                     cairo_set_operator (xrs, CAIRO_OPERATOR_OVER);
 459                     grr_icon_draw_predrawn (view->target_icon[rr_target_idx (target)], xrs);
 460                     cairo_restore (xrs);
 461                 } else {
 462                     grr_icon_draw_predrawn (view->target_icon[rr_target_idx (target)], xrs);
 463                 }
 464             }
 465
 466             if (robot)
 467                 grr_icon_draw_predrawn (view->robot_icon[rr_robot_idx (robot)], xrs);
 468
 469             cairo_restore (xrs);
 470         }
 471     }
 472
 473     /* Draw goal target in center of board */
 474     /* XXX: Not a perfect heuristic. Should check for the vacant box too. */
 475     if (view->board_width == 16 && view->board_height == 16) {
 476         cairo_save (xrs);
 477         cairo_translate (xrs,
 478                      (view->board_width / 2 - 1) * view->cell_width,
 479                      (view->board_height / 2 - 1) * view->cell_height);
 480         cairo_scale (xrs,
 481                      2 * view->cell_width / GRR_SVG_ASSUMED_WIDTH,
 482                      2 * view->cell_height / GRR_SVG_ASSUMED_HEIGHT);
 483         cairo_rectangle (xrs, 0, 0, GRR_SVG_ASSUMED_WIDTH, GRR_SVG_ASSUMED_HEIGHT);
 484         cairo_set_rgb_color (xrs, 1, 1, 1);
 485         cairo_fill (xrs);
 486         grr_icon_draw (view->target_icon[rr_target_idx (goal_target)], xrs);
 487         cairo_restore (xrs);
 488     }
 489
 490     /* Draw walls */
 491     for (j=0; j < view->board_height; j++) {
 492         for (i=0; i < view->board_width; i++) {
 493             if (! view->damaged[j][i])
 494                 continue;
 495             view->damaged[j][i] = 0;
 496             cairo_save (xrs);
 497             cairo_translate (xrs, i * view->cell_width, j * view->cell_height);
 498             cairo_scale (xrs,
 499                      view->cell_width / GRR_SVG_ASSUMED_WIDTH,
 500                      view->cell_height / GRR_SVG_ASSUMED_HEIGHT);
 501             grr_board_view_draw_walls (view, xrs, RR_CELL_GET_WALLS (rr_board_get_cell(board, i, j)));
 502             cairo_restore (xrs);
 503         }
 504     }
 505
 506     cairo_destroy (xrs);
 507
 508     return FALSE;
 509 }
 510
 511 void
 512 grr_board_view_transform_pixel_to_cell (grr_board_view_t *view,
 513                                         int pixel_x, int pixel_y,
 514                                         int *cell_x, int *cell_y)
 515 {
 516     int x, y;
 517     x = (pixel_x - view->board_pad_x) / view->cell_width;
 518     y = (pixel_y - view->board_pad_y) / view->cell_height;
 519     if (x < 0)
 520         x = 0;
 521     if (x >= view->board_width)
 522         x = view->board_width - 1;
 523     if (y < 0)
 524         y = 0;
 525     if (y >= view->board_height)
 526         y = view->board_height - 1;
 527     *cell_x = x;
 528     *cell_y = y;
 529 }
 530
 531 void
 532 grr_board_view_transform_cell_to_pixel (grr_board_view_t *view,
 533                                         int cell_x, int cell_y,
 534                                         int *pixel_x, int *pixel_y)
 535 {
 536     *pixel_x = view->cell_width * cell_x + view->board_pad_x;
 537     *pixel_y = view->cell_height * cell_y + view->board_pad_y;
 538 }
 539
 540 static gint
 541 grr_board_view_button_press (GtkWidget      *widget,
 542                              GdkEventButton *event)
 543 {
 544     grr_board_view_t *view;
 545     rr_cell_t cell;
 546     int x, y;
 547
 548     g_return_val_if_fail (widget != NULL, FALSE);
 549     g_return_val_if_fail (GRR_IS_BOARD_VIEW (widget), FALSE);
 550     g_return_val_if_fail (event != NULL, FALSE);
 551
 552     view = GRR_BOARD_VIEW (widget);
 553
 554     grr_board_view_transform_pixel_to_cell (view,
 555                                             event->x, event->y,
 556                                             &x, &y);
 557
 558     cell = rr_board_get_cell (view->board, x, y);
 559     if (!view->button && RR_CELL_GET_ROBOT (cell)) {
 560
 561         gtk_grab_add (widget);
 562
 563         view->button = event->button;
 564         grr_board_view_set_active_robot (view, RR_CELL_GET_ROBOT (cell));
 565
 566         grr_board_view_update_mouse (view, event->x, event->y);
 567     }
 568
 569     return FALSE;
 570 }
 571
 572 static gint
 573 grr_board_view_button_release (GtkWidget      *widget,
 574                                GdkEventButton *event)
 575 {
 576     grr_board_view_t *view;
 577     rr_direction_t dir;
 578     int x, y;
 579     int robot_x, robot_y;
 580     int dx, dy;
 581
 582     g_return_val_if_fail (widget != NULL, FALSE);
 583     g_return_val_if_fail (GRR_IS_BOARD_VIEW (widget), FALSE);
 584     g_return_val_if_fail (event != NULL, FALSE);
 585
 586     view = GRR_BOARD_VIEW (widget);
 587
 588     if (view->button == event->button) {
 589       gtk_grab_remove (widget);
 590       view->button = 0;
 591     }
 592
 593     grr_board_view_transform_pixel_to_cell (view, event->x, event->y, &x, &y);
 594
 595     rr_board_find_robot (view->board, view->active_robot, &robot_x, &robot_y);
 596     dx = x - robot_x;
 597     dy = y - robot_y;
 598     if (dx == 0 && dy == 0)
 599         return FALSE;
 600
 601     if (abs(dx) > abs(dy))
 602         if (x > robot_x)
 603             dir = RR_DIRECTION_EAST;
 604         else
 605             dir = RR_DIRECTION_WEST;
 606     else
 607         if (y > robot_y)
 608             dir = RR_DIRECTION_SOUTH;
 609         else
 610             dir = RR_DIRECTION_NORTH;
 611
 612     grr_board_view_move_active (view, dir);
 613
 614     return FALSE;
 615 }
 616
 617 static gint
 618 grr_board_view_motion_notify (GtkWidget      *widget,
 619                          GdkEventMotion *event)
 620 {
 621     grr_board_view_t *view;
 622     GdkModifierType mods;
 623     gint x, y, mask;
 624
 625     g_return_val_if_fail (widget != NULL, FALSE);
 626     g_return_val_if_fail (GRR_IS_BOARD_VIEW (widget), FALSE);
 627     g_return_val_if_fail (event != NULL, FALSE);
 628
 629     view = GRR_BOARD_VIEW (widget);
 630
 631     if (view->button != 0) {
 632         x = event->x;
 633         y = event->y;
 634
 635         if (event->is_hint || (event->window != widget->window))
 636             gdk_window_get_pointer (widget->window, &x, &y, &mods);
 637
 638         switch (view->button) {
 639         case 1:
 640             mask = GDK_BUTTON1_MASK;
 641             break;
 642         case 2:
 643             mask = GDK_BUTTON2_MASK;
 644             break;
 645         case 3:
 646             mask = GDK_BUTTON3_MASK;
 647             break;
 648         default:
 649             mask = 0;
 650             break;
 651         }
 652
 653         if (mods & mask)
 654             grr_board_view_update_mouse (view, x,y);
 655     }
 656
 657     return FALSE;
 658 }
 659
 660 static void
 661 grr_board_view_update_mouse (grr_board_view_t *view, gint x, gint y)
 662 {
 663     g_return_if_fail (view != NULL);
 664     g_return_if_fail (GRR_IS_BOARD_VIEW (view));
 665
 666     /* XXX: Perhaps should draw a robot here */
 667 }
 668
 669 void
 670 grr_board_view_mark_damage (grr_board_view_t *view, int i, int j)
 671 {
 672     int x, y;
 673
 674     grr_board_view_transform_cell_to_pixel (view, i, j, &x, &y);
 675     gtk_widget_queue_draw_area (GTK_WIDGET (view), x, y, view->cell_width, view->cell_height);
 676 }