widget.c

   1 /*
   2  * widget.c - widget managing
   3  *
   4  * Copyright © 2007-2008 Julien Danjou <julien@danjou.info>
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License along
  17  * with this program; if not, write to the Free Software Foundation, Inc.,
  18  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  19  *
  20  */
  21
  22 #include <math.h>
  23
  24 #include <xcb/xcb.h>
  25 #include <xcb/xcb_atom.h>
  26
  27 #include "mouse.h"
  28 #include "widget.h"
  29 #include "wibox.h"
  30 #include "common/atoms.h"
  31
  32 extern awesome_t globalconf;
  33
  34 DO_LUA_NEW(extern, widget_t, widget, "widget", widget_ref)
  35 DO_LUA_GC(widget_t, widget, "widget", widget_unref)
  36 DO_LUA_EQ(widget_t, widget, "widget")
  37
  38 #include "widgetgen.h"
  39
  40 /** Delete a widget structure.
  41  * \param widget The widget to destroy.
  42  */
  43 void
  44 widget_delete(widget_t **widget)
  45 {
  46     if((*widget)->destructor)
  47         (*widget)->destructor(*widget);
  48     button_array_wipe(&(*widget)->buttons);
  49     luaL_unref(globalconf.L, LUA_REGISTRYINDEX, (*widget)->mouse_enter);
  50     luaL_unref(globalconf.L, LUA_REGISTRYINDEX, (*widget)->mouse_leave);
  51     p_delete(&(*widget)->name);
  52     p_delete(widget);
  53 }
  54
  55 /** Compute offset for drawing the first pixel of a widget.
  56  * \param barwidth The wibox width.
  57  * \param widgetwidth The widget width.
  58  * \param alignment The widget alignment on wibox.
  59  * \return The x coordinate to draw at.
  60  */
  61 int
  62 widget_calculate_offset(int barwidth, int widgetwidth, int offset, int alignment)
  63 {
  64     switch(alignment)
  65     {
  66       case AlignLeft:
  67       case AlignFlex:
  68         return offset;
  69     }
  70     return barwidth - offset - widgetwidth;
  71 }
  72
  73 /** Common function for button press event on widget.
  74  * It will look into configuration to find the callback function to call.
  75  * \param w The widget node.
  76  * \param ev The button press event the widget received.
  77  * \param screen The screen number.
  78  * \param p The object where user clicked.
  79  */
  80 static void
  81 widget_common_button(widget_node_t *w,
  82                      xcb_button_press_event_t *ev,
  83                      int screen __attribute__ ((unused)),
  84                      wibox_t *p)
  85 {
  86     button_array_t *b = &w->widget->buttons;
  87
  88     for(int i = 0; i < b->len; i++)
  89         if(ev->detail == b->tab[i]->button
  90            && XUTIL_MASK_CLEAN(ev->state) == b->tab[i]->mod)
  91         {
  92             luaA_wibox_userdata_new(globalconf.L, p);
  93             luaA_dofunction(globalconf.L,
  94                             ev->response_type == XCB_BUTTON_PRESS ?
  95                             b->tab[i]->press : b->tab[i]->release,
  96                             1, 0);
  97         }
  98 }
  99
 100 /** Convert a Lua table to a list of widget nodet.
 101  * \param L The Lua VM state.
 102  * \param widgets The linked list of widget node.
 103  */
 104 void
 105 luaA_table2widgets(lua_State *L, widget_node_array_t *widgets)
 106 {
 107     if(lua_istable(L, -1))
 108     {
 109         lua_pushnil(L);
 110         while(luaA_next(L, -2))
 111         {
 112             luaA_table2widgets(L, widgets);
 113             lua_pop(L, 1); /* remove value */
 114         }
 115     }
 116     else
 117     {
 118         widget_t **widget = luaA_toudata(L, -1, "widget");
 119         if(widget)
 120         {
 121             widget_node_t w;
 122             p_clear(&w, 1);
 123             w.widget = widget_ref(widget);
 124             widget_node_array_append(widgets, w);
 125         }
 126     }
 127 }
 128
 129 /** Render a list of widgets.
 130  * \param wnode The list of widgets.
 131  * \param ctx The draw context where to render.
 132  * \param rotate_px The rotate pixmap: where to rotate and render the final
 133  * pixmap when the object oritation is not east.
 134  * \param screen The logical screen used to render.
 135  * \param orientation The object orientation.
 136  * \param x The x coordinates of the object.
 137  * \param y The y coordinates of the object.
 138  * \param wibox The wibox.
 139  * \todo Remove GC.
 140  */
 141 void
 142 widget_render(widget_node_array_t *widgets, draw_context_t *ctx, xcb_gcontext_t gc, xcb_pixmap_t rotate_px,
 143               int screen, orientation_t orientation,
 144               int x, int y, wibox_t *wibox)
 145 {
 146     int left = 0, right = 0;
 147     area_t rectangle = { 0, 0, 0, 0 };
 148
 149     rectangle.width = ctx->width;
 150     rectangle.height = ctx->height;
 151
 152     if(ctx->bg.alpha != 0xffff)
 153     {
 154         xcb_get_property_reply_t *prop_r;
 155         char *data;
 156         xcb_pixmap_t rootpix;
 157         xcb_get_property_cookie_t prop_c;
 158         xcb_screen_t *s = xutil_screen_get(globalconf.connection, ctx->phys_screen);
 159         prop_c = xcb_get_property_unchecked(globalconf.connection, false, s->root, _XROOTPMAP_ID,
 160                                             PIXMAP, 0, 1);
 161         if((prop_r = xcb_get_property_reply(globalconf.connection, prop_c, NULL)))
 162         {
 163             if(prop_r->value_len
 164                && (data = xcb_get_property_value(prop_r))
 165                && (rootpix = *(xcb_pixmap_t *) data))
 166                switch(orientation)
 167                {
 168                  case North:
 169                    draw_rotate(ctx,
 170                                rootpix, ctx->pixmap,
 171                                s->width_in_pixels, s->height_in_pixels,
 172                                ctx->width, ctx->height,
 173                                M_PI_2,
 174                                y + ctx->width,
 175                                - x);
 176                    break;
 177                  case South:
 178                    draw_rotate(ctx,
 179                                rootpix, ctx->pixmap,
 180                                s->width_in_pixels, s->height_in_pixels,
 181                                ctx->width, ctx->height,
 182                                - M_PI_2,
 183                                - y,
 184                                x + ctx->height);
 185                    break;
 186                  case East:
 187                    xcb_copy_area(globalconf.connection, rootpix,
 188                                  rotate_px, gc,
 189                                  x, y,
 190                                  0, 0,
 191                                  ctx->width, ctx->height);
 192                    break;
 193                }
 194             p_delete(&prop_r);
 195         }
 196     }
 197
 198     /* compute geometry */
 199     for(int i = 0; i < widgets->len; i++)
 200         if(widgets->tab[i].widget->align == AlignLeft && widgets->tab[i].widget->isvisible)
 201         {
 202             widgets->tab[i].geometry = widgets->tab[i].widget->geometry(widgets->tab[i].widget,
 203                                                                         screen, ctx->height,
 204                                                                         ctx->width - (left + right));
 205             widgets->tab[i].geometry.x = left;
 206             left += widgets->tab[i].geometry.width;
 207         }
 208
 209     for(int i = widgets->len - 1; i >= 0; i--)
 210         if(widgets->tab[i].widget->align == AlignRight && widgets->tab[i].widget->isvisible)
 211         {
 212             widgets->tab[i].geometry = widgets->tab[i].widget->geometry(widgets->tab[i].widget,
 213                                                                         screen, ctx->height,
 214                                                                         ctx->width - (left + right));
 215             right += widgets->tab[i].geometry.width;
 216             widgets->tab[i].geometry.x = ctx->width - right;
 217         }
 218
 219     /* save left value */
 220     int fake_left = left;
 221
 222     /* compute width of flex aligned widgets that does not support it */
 223     int flex = 0;
 224     for(int i = 0; i < widgets->len; i++)
 225         if(widgets->tab[i].widget->align == AlignFlex
 226           && widgets->tab[i].widget->isvisible)
 227         {
 228             if(widgets->tab[i].widget->align_supported & AlignFlex)
 229                 flex++;
 230             else
 231                 fake_left += widgets->tab[i].widget->geometry(widgets->tab[i].widget,
 232                                                               screen, ctx->height,
 233                                                               ctx->width - (fake_left + right)).width;
 234         }
 235
 236     /* now compute everybody together! */
 237     int flex_rendered = 0;
 238     for(int i = 0; i < widgets->len; i++)
 239         if(widgets->tab[i].widget->align == AlignFlex
 240           && widgets->tab[i].widget->isvisible)
 241         {
 242             if(widgets->tab[i].widget->align_supported & AlignFlex)
 243             {
 244                 int width = (ctx->width - (right + fake_left)) / flex;
 245                 /* give last pixels to last flex to be rendered */
 246                 if(flex_rendered == flex - 1)
 247                     width += (ctx->width - (right + fake_left)) % flex;
 248                 widgets->tab[i].geometry = widgets->tab[i].widget->geometry(widgets->tab[i].widget,
 249                                                                             screen, ctx->height,
 250                                                                             width);
 251                 flex_rendered++;
 252             }
 253             else
 254                 widgets->tab[i].geometry = widgets->tab[i].widget->geometry(widgets->tab[i].widget,
 255                                                                             screen, ctx->height,
 256                                                                             ctx->width - (left + right));
 257             widgets->tab[i].geometry.x = left;
 258             left += widgets->tab[i].geometry.width;
 259         }
 260
 261     /* draw everything! */
 262     draw_rectangle(ctx, rectangle, 1.0, true, &ctx->bg);
 263
 264     for(int i = 0; i < widgets->len; i++)
 265         if(widgets->tab[i].widget->isvisible)
 266         {
 267             widgets->tab[i].geometry.y = 0;
 268             widgets->tab[i].widget->draw(widgets->tab[i].widget,
 269                                          ctx, widgets->tab[i].geometry,
 270                                          screen, wibox);
 271         }
 272
 273     switch(orientation)
 274     {
 275         case South:
 276           draw_rotate(ctx, ctx->pixmap, rotate_px,
 277                       ctx->width, ctx->height,
 278                       ctx->height, ctx->width,
 279                       M_PI_2, ctx->height, 0);
 280           break;
 281         case North:
 282           draw_rotate(ctx, ctx->pixmap, rotate_px,
 283                       ctx->width, ctx->height,
 284                       ctx->height, ctx->width,
 285                       - M_PI_2, 0, ctx->width);
 286           break;
 287         case East:
 288           break;
 289     }
 290 }
 291
 292 /** Common function for creating a widget.
 293  * \param widget The allocated widget.
 294  */
 295 void
 296 widget_common_new(widget_t *widget)
 297 {
 298     widget->button = widget_common_button;
 299     widget->align_supported = AlignLeft | AlignRight;
 300 }
 301
 302 /** Invalidate widgets which should be refresh upon
 303  * external modifications. widget_t who watch flags will
 304  * be set to be refreshed.
 305  * \param screen Virtual screen number.
 306  * \param flags Cache flags to invalidate.
 307  */
 308 void
 309 widget_invalidate_cache(int screen, int flags)
 310 {
 311     for(int i = 0; i < globalconf.screens[screen].wiboxes.len; i++)
 312     {
 313         wibox_t *wibox = globalconf.screens[screen].wiboxes.tab[i];
 314
 315         for(int j = 0; j < wibox->widgets.len; j++)
 316             if(wibox->widgets.tab[j].widget->cache_flags & flags)
 317             {
 318                 wibox->need_update = true;
 319                 break;
 320             }
 321     }
 322 }
 323
 324 /** Set a wibox needs update because it has widget, or redraw a titlebar.
 325  * \todo Probably needs more optimization.
 326  * \param widget The widget to look for.
 327  */
 328 void
 329 widget_invalidate_bywidget(widget_t *widget)
 330 {
 331     for(int screen = 0; screen < globalconf.nscreen; screen++)
 332         for(int i = 0; i < globalconf.screens[screen].wiboxes.len; i++)
 333         {
 334             wibox_t *wibox = globalconf.screens[screen].wiboxes.tab[i];
 335             if(!wibox->need_update)
 336                 for(int j = 0; j < wibox->widgets.len; j++)
 337                     if(wibox->widgets.tab[j].widget == widget)
 338                     {
 339                         wibox->need_update = true;
 340                         break;
 341                     }
 342          }
 343
 344     for(client_t *c = globalconf.clients; c; c = c->next)
 345         if(c->titlebar && !c->titlebar->need_update)
 346             for(int j = 0; j < c->titlebar->widgets.len; j++)
 347                 if(c->titlebar->widgets.tab[j].widget == widget)
 348                 {
 349                     c->titlebar->need_update = true;
 350                     break;
 351                 }
 352 }
 353
 354 /** Deprecated function to add mouse bindings.
 355  * \param L The Lua VM state.
 356  * \return The number of elements pushed on stack.
 357  */
 358 static int
 359 luaA_widget_mouse_add(lua_State *L)
 360 {
 361     deprecate(L);
 362     return 0;
 363 }
 364
 365 /** Create a new widget.
 366  * \param L The Lua VM state.
 367  *
 368  * \luastack
 369  * \lparam A table with at least a name and a type value. Optional attributes
 370  * are: align.
 371  * \lreturn A brand new widget.
 372  */
 373 static int
 374 luaA_widget_new(lua_State *L)
 375 {
 376     const char *buf, *type;
 377     widget_t *w = NULL;
 378     widget_constructor_t *wc;
 379     alignment_t align;
 380     size_t len;
 381
 382     luaA_checktable(L, 2);
 383
 384     buf = luaA_getopt_lstring(L, 2, "align", "left", &len);
 385     align = draw_align_fromstr(buf, len);
 386
 387     buf = luaA_getopt_string(L, 2, "name", NULL);
 388
 389     type = luaA_getopt_string(L, 2, "type", NULL);
 390
 391     /* deprecated, compatibility code */
 392     if(!a_strcmp(type, "tasklist")
 393        || !a_strcmp(type, "taglist"))
 394     {
 395         deprecate(L);
 396         luaA_warn(L, "requesting old widgets, return a table to allow smooth execution.\n");
 397         lua_newtable(L);
 398         lua_pushcfunction(L, luaA_widget_mouse_add);
 399         lua_setfield(L, -2, "mouse_add");
 400         return 1;
 401     }
 402     else if((wc = name_func_lookup(type, WidgetList)))
 403         w = wc(align);
 404     else
 405     {
 406         luaA_warn(L, "unkown widget type: %s", type);
 407         return 0;
 408     }
 409
 410     w->type = wc;
 411
 412     /* Set visible by default. */
 413     w->isvisible = true;
 414
 415     w->mouse_enter = w->mouse_leave = LUA_REFNIL;
 416
 417     w->name = a_strdup(buf);
 418
 419     return luaA_widget_userdata_new(L, w);
 420 }
 421
 422 /** Get or set mouse buttons bindings to a widget.
 423  * \param L The Lua VM state.
 424  *
 425  * \luastack
 426  * \lvalue A widget.
 427  * \lparam An array of mouse button bindings objects, or nothing.
 428  * \return The array of mouse button bindings objects of this widget.
 429  */
 430 static int
 431 luaA_widget_buttons(lua_State *L)
 432 {
 433     widget_t **widget = luaA_checkudata(L, 1, "widget");
 434     button_array_t *buttons = &(*widget)->buttons;
 435
 436     if(lua_gettop(L) == 2)
 437     {
 438         luaA_button_array_set(L, 2, buttons);
 439         return 1;
 440     }
 441
 442     return luaA_button_array_get(L, buttons);
 443 }
 444
 445 /** Generic widget.
 446  * \param L The Lua VM state.
 447  * \return The number of elements pushed on stack.
 448  * \luastack
 449  * \lfield visible The widget visibility.
 450  * \lfield name The widget name.
 451  * \lfield mouse_enter A function to execute when the mouse enter the widget.
 452  * \lfield mouse_leave A function to execute when the mouse leave the widget.
 453  */
 454 static int
 455 luaA_widget_index(lua_State *L)
 456 {
 457     size_t len;
 458     widget_t **widget = luaA_checkudata(L, 1, "widget");
 459     const char *buf = luaL_checklstring(L, 2, &len);
 460     awesome_token_t token;
 461
 462     if(luaA_usemetatable(L, 1, 2))
 463         return 1;
 464
 465     switch((token = a_tokenize(buf, len)))
 466     {
 467       case A_TK_VISIBLE:
 468         lua_pushboolean(L, (*widget)->isvisible);
 469         return 1;
 470       case A_TK_NAME:
 471         if((*widget)->name)
 472             lua_pushstring(L, (*widget)->name);
 473         else
 474             lua_pushnil(L);
 475         return 1;
 476       case A_TK_MOUSE_ENTER:
 477         if((*widget)->mouse_enter != LUA_REFNIL)
 478             lua_rawgeti(L, LUA_REGISTRYINDEX, (*widget)->mouse_enter);
 479         else
 480             return 0;
 481         return 1;
 482       case A_TK_MOUSE_LEAVE:
 483         if((*widget)->mouse_leave != LUA_REFNIL)
 484             lua_rawgeti(L, LUA_REGISTRYINDEX, (*widget)->mouse_leave);
 485         else
 486             return 0;
 487         return 1;
 488       default:
 489         break;
 490     }
 491
 492     return (*widget)->index ? (*widget)->index(L, token) : 0;
 493 }
 494
 495 /** Generic widget newindex.
 496  * \param L The Lua VM state.
 497  * \return The number of elements pushed on stack.
 498  */
 499 static int
 500 luaA_widget_newindex(lua_State *L)
 501 {
 502     size_t len;
 503     widget_t **widget = luaA_checkudata(L, 1, "widget");
 504     const char *buf = luaL_checklstring(L, 2, &len);
 505     awesome_token_t token;
 506
 507     switch((token = a_tokenize(buf, len)))
 508     {
 509       case A_TK_VISIBLE:
 510         (*widget)->isvisible = luaA_checkboolean(L, 3);
 511         break;
 512       case A_TK_MOUSE_ENTER:
 513         luaA_registerfct(L, 3, &(*widget)->mouse_enter);
 514         break;
 515       case A_TK_MOUSE_LEAVE:
 516         luaA_registerfct(L, 3, &(*widget)->mouse_leave);
 517         break;
 518       default:
 519         return (*widget)->newindex ? (*widget)->newindex(L, token) : 0;
 520     }
 521
 522     widget_invalidate_bywidget(*widget);
 523
 524     return 0;
 525 }
 526
 527 const struct luaL_reg awesome_widget_methods[] =
 528 {
 529     { "__call", luaA_widget_new },
 530     { NULL, NULL }
 531 };
 532 const struct luaL_reg awesome_widget_meta[] =
 533 {
 534     { "buttons", luaA_widget_buttons },
 535     { "mouse_add", luaA_widget_mouse_add },
 536     { "__index", luaA_widget_index },
 537     { "__newindex", luaA_widget_newindex },
 538     { "__gc", luaA_widget_gc },
 539     { "__eq", luaA_widget_eq },
 540     { "__tostring", luaA_widget_tostring },
 541     { NULL, NULL }
 542 };
 543
 544 // vim: filetype=c:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=80