widget.c

   1 /*
   2  * widget.c - widget managing
   3  *
   4  * Copyright © 2007-2009 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 "screen.h"
  28 #include "mouse.h"
  29 #include "widget.h"
  30 #include "wibox.h"
  31 #include "client.h"
  32 #include "luaa.h"
  33 #include "common/atoms.h"
  34 #include "common/xutil.h"
  35
  36 LUA_OBJECT_FUNCS(widget_class, widget_t, widget);
  37
  38 /** Collect a widget structure.
  39  * \param L The Lua VM state.
  40  * \return 0
  41  */
  42 static int
  43 luaA_widget_gc(lua_State *L)
  44 {
  45     widget_t *widget = luaA_checkudata(L, 1, &widget_class);
  46     if(widget->destructor)
  47         widget->destructor(widget);
  48     button_array_wipe(&widget->buttons);
  49     return luaA_object_gc(L);
  50 }
  51
  52 /** Delete a widget node structure.
  53  * \param node The node to destroy.
  54  */
  55 void
  56 widget_node_delete(widget_node_t *node)
  57 {
  58     luaA_object_unref(globalconf.L, node->widget);
  59 }
  60
  61 /** Get a widget node from a wibox by coords.
  62  * \param orientation Wibox orientation.
  63  * \param widgets The widget list.
  64  * \param width The container width.
  65  * \param height The container height.
  66  * \param x X coordinate of the widget.
  67  * \param y Y coordinate of the widget.
  68  * \return A widget.
  69  */
  70 widget_t *
  71 widget_getbycoords(orientation_t orientation, widget_node_array_t *widgets,
  72                    int width, int height, int16_t *x, int16_t *y)
  73 {
  74     int tmp;
  75
  76     /* Need to transform coordinates like it was top/bottom */
  77     switch(orientation)
  78     {
  79       case South:
  80         tmp = *y;
  81         *y = width - *x;
  82         *x = tmp;
  83         break;
  84       case North:
  85         tmp = *y;
  86         *y = *x;
  87         *x = height - tmp;
  88         break;
  89       default:
  90         break;
  91     }
  92     foreach(w, *widgets)
  93         if(w->widget->isvisible
  94            && *x >= w->geometry.x && *x < w->geometry.x + w->geometry.width
  95            && *y >= w->geometry.y && *y < w->geometry.y + w->geometry.height)
  96             return w->widget;
  97
  98     return NULL;
  99 }
 100
 101 /** Convert a Lua table to a list of widget nodes.
 102  * \param L The Lua VM state.
 103  * \param widgets The linked list of widget node.
 104  */
 105 static void
 106 luaA_table2widgets(lua_State *L, widget_node_array_t *widgets)
 107 {
 108     if(lua_istable(L, -1))
 109     {
 110         lua_pushnil(L);
 111         while(luaA_next(L, -2))
 112             luaA_table2widgets(L, widgets);
 113         /* remove the table */
 114         lua_pop(L, 1);
 115     }
 116     else
 117     {
 118         widget_t *widget = luaA_toudata(L, -1, &widget_class);
 119         if(widget)
 120         {
 121             widget_node_t w;
 122             p_clear(&w, 1);
 123             w.widget = luaA_object_ref(L, -1);
 124             widget_node_array_append(widgets, w);
 125         }
 126         else
 127             lua_pop(L, 1); /* remove value */
 128     }
 129 }
 130
 131 /** Retrieve a list of widget geometries using a Lua layout function.
 132  * a table which contains the geometries is then pushed onto the stack
 133  * \param wibox The wibox.
 134  * \return True is everything is ok, false otherwise.
 135  */
 136 static bool
 137 widget_geometries(wibox_t *wibox)
 138 {
 139     /* get the layout field of the widget table */
 140     if(wibox->widgets_table)
 141     {
 142         /* push wibox */
 143         luaA_object_push(globalconf.L, wibox);
 144         /* push widgets table */
 145         luaA_object_push_item(globalconf.L, -1, wibox->widgets_table);
 146         /* remove wibox */
 147         lua_remove(globalconf.L, -2);
 148         /* get layout field from the table */
 149         lua_getfield(globalconf.L, -1, "layout");
 150         /* remove the widget table */
 151         lua_remove(globalconf.L, -2);
 152     }
 153     else
 154         lua_pushnil(globalconf.L);
 155
 156     /* if the layout field is a function */
 157     if(lua_isfunction(globalconf.L, -1))
 158     {
 159         /* Push 1st argument: wibox geometry */
 160         area_t geometry = wibox->geometry;
 161         geometry.x = 0;
 162         geometry.y = 0;
 163         /* we need to exchange the width and height of the wibox window if it
 164          * it is rotated, so the layout function doesn't need to care about that
 165          */
 166         if(wibox->orientation != East)
 167         {
 168             int i = geometry.height;
 169             geometry.height = geometry.width;
 170             geometry.width = i;
 171         }
 172         luaA_pusharea(globalconf.L, geometry);
 173         /* Push 2nd argument: widget table */
 174         luaA_object_push(globalconf.L, wibox);
 175         luaA_object_push_item(globalconf.L, -1, wibox->widgets_table);
 176         lua_remove(globalconf.L, -2);
 177         /* Push 3rd argument: wibox screen */
 178         lua_pushnumber(globalconf.L, screen_array_indexof(&globalconf.screens, wibox->screen));
 179         /* Re-push the layout function */
 180         lua_pushvalue(globalconf.L, -4);
 181         /* call the layout function with 3 arguments (wibox geometry, widget
 182          * table, screen) and wait for one result */
 183         if(!luaA_dofunction(globalconf.L, 3, 1))
 184             return false;
 185
 186         /* Remove the left over layout function */
 187         lua_remove(globalconf.L, -2);
 188     }
 189     else
 190     {
 191         /* Remove the "nil function" */
 192         lua_pop(globalconf.L, 1);
 193
 194         /* If no layout function has been specified, we just push a table with
 195          * geometries onto the stack. These geometries are nothing fancy, they
 196          * have x = y = 0 and their height and width set to the widgets demands
 197          * or the wibox size, depending on which is less.
 198          */
 199
 200         widget_node_array_t *widgets = &wibox->widgets;
 201         widget_node_array_wipe(widgets);
 202         widget_node_array_init(widgets);
 203
 204         /* push wibox */
 205         luaA_object_push(globalconf.L, wibox);
 206         /* push widgets table */
 207         luaA_object_push_item(globalconf.L, -1, wibox->widgets_table);
 208         /* remove wibox */
 209         lua_remove(globalconf.L, -2);
 210         luaA_table2widgets(globalconf.L, widgets);
 211
 212         lua_newtable(globalconf.L);
 213         for(int i = 0; i < widgets->len; i++)
 214         {
 215             lua_pushnumber(globalconf.L, i + 1);
 216             widget_t *widget = widgets->tab[i].widget;
 217             lua_pushnumber(globalconf.L, screen_array_indexof(&globalconf.screens, wibox->screen));
 218             area_t geometry = widget->extents(globalconf.L, widget);
 219             lua_pop(globalconf.L, 1);
 220             geometry.x = geometry.y = 0;
 221             geometry.width = MIN(wibox->geometry.width, geometry.width);
 222             geometry.height = MIN(wibox->geometry.height, geometry.height);
 223
 224             luaA_pusharea(globalconf.L, geometry);
 225
 226             lua_settable(globalconf.L, -3);
 227         }
 228     }
 229     return true;
 230 }
 231
 232 /** Render a list of widgets.
 233  * \param wibox The wibox.
 234  * \todo Remove GC.
 235  */
 236 void
 237 widget_render(wibox_t *wibox)
 238 {
 239     lua_State *L = globalconf.L;
 240     draw_context_t *ctx = &wibox->ctx;
 241     area_t rectangle = { 0, 0, 0, 0 };
 242     color_t col;
 243
 244     rectangle.width = ctx->width;
 245     rectangle.height = ctx->height;
 246
 247     if (!widget_geometries(wibox))
 248         return;
 249
 250     if(ctx->bg.alpha != 0xffff)
 251     {
 252         int x = wibox->geometry.x + wibox->border_width,
 253             y = wibox->geometry.y + wibox->border_width;
 254         xcb_get_property_reply_t *prop_r;
 255         char *data;
 256         xcb_pixmap_t rootpix;
 257         xcb_get_property_cookie_t prop_c;
 258         xcb_screen_t *s = xutil_screen_get(globalconf.connection, ctx->phys_screen);
 259         prop_c = xcb_get_property_unchecked(globalconf.connection, false, s->root, _XROOTPMAP_ID,
 260                                             PIXMAP, 0, 1);
 261         if((prop_r = xcb_get_property_reply(globalconf.connection, prop_c, NULL)))
 262         {
 263             if(prop_r->value_len
 264                && (data = xcb_get_property_value(prop_r))
 265                && (rootpix = *(xcb_pixmap_t *) data))
 266                switch(wibox->orientation)
 267                {
 268                  case North:
 269                    draw_rotate(ctx,
 270                                rootpix, ctx->pixmap,
 271                                s->width_in_pixels, s->height_in_pixels,
 272                                ctx->width, ctx->height,
 273                                M_PI_2,
 274                                y + ctx->width,
 275                                - x);
 276                    break;
 277                  case South:
 278                    draw_rotate(ctx,
 279                                rootpix, ctx->pixmap,
 280                                s->width_in_pixels, s->height_in_pixels,
 281                                ctx->width, ctx->height,
 282                                - M_PI_2,
 283                                - y,
 284                                x + ctx->height);
 285                    break;
 286                  case East:
 287                    xcb_copy_area(globalconf.connection, rootpix,
 288                                  wibox->pixmap, wibox->gc,
 289                                  x, y,
 290                                  0, 0,
 291                                  ctx->width, ctx->height);
 292                    break;
 293                }
 294             p_delete(&prop_r);
 295         }
 296     }
 297
 298     widget_node_array_t *widgets = &wibox->widgets;
 299
 300     widget_node_array_wipe(widgets);
 301     widget_node_array_init(widgets);
 302     /* push wibox */
 303     luaA_object_push(globalconf.L, wibox);
 304     /* push widgets table */
 305     luaA_object_push_item(globalconf.L, -1, wibox->widgets_table);
 306     /* remove wibox */
 307     lua_remove(globalconf.L, -2);
 308     luaA_table2widgets(L, widgets);
 309
 310     /* get computed geometries */
 311     for(unsigned int i = 0; i < lua_objlen(L, -1); i++)
 312     {
 313         lua_pushnumber(L, i + 1);
 314         lua_gettable(L, -2);
 315
 316         widgets->tab[i].geometry.x = luaA_getopt_number(L, -1, "x", wibox->geometry.x);
 317         widgets->tab[i].geometry.y = luaA_getopt_number(L, -1, "y", wibox->geometry.y);
 318         widgets->tab[i].geometry.width = luaA_getopt_number(L, -1, "width", 1);
 319         widgets->tab[i].geometry.height = luaA_getopt_number(L, -1, "height", 1);
 320
 321         lua_pop(L, 1);
 322     }
 323     lua_pop(L, 1);
 324
 325     /* draw background image, only if the background color is not opaque */
 326     if(wibox->bg_image && ctx->bg.alpha != 0xffff)
 327         draw_image(ctx, 0, 0, 1.0, wibox->bg_image);
 328
 329     /* draw background color */
 330     xcolor_to_color(&ctx->bg, &col);
 331     draw_rectangle(ctx, rectangle, 1.0, true, &col);
 332
 333     /* draw everything! */
 334     for(int i = 0; i < widgets->len; i++)
 335         if(widgets->tab[i].widget->isvisible)
 336             widgets->tab[i].widget->draw(widgets->tab[i].widget,
 337                                          ctx, widgets->tab[i].geometry, wibox);
 338
 339     switch(wibox->orientation)
 340     {
 341         case South:
 342           draw_rotate(ctx, ctx->pixmap, wibox->pixmap,
 343                       ctx->width, ctx->height,
 344                       ctx->height, ctx->width,
 345                       M_PI_2, ctx->height, 0);
 346           break;
 347         case North:
 348           draw_rotate(ctx, ctx->pixmap, wibox->pixmap,
 349                       ctx->width, ctx->height,
 350                       ctx->height, ctx->width,
 351                       - M_PI_2, 0, ctx->width);
 352           break;
 353         case East:
 354           break;
 355     }
 356 }
 357
 358 /** Invalidate widgets which should be refresh depending on their types.
 359  * \param type Widget type to invalidate.
 360  */
 361 void
 362 widget_invalidate_bytype(widget_constructor_t *type)
 363 {
 364     foreach(wibox, globalconf.wiboxes)
 365         foreach(wnode, (*wibox)->widgets)
 366             if(wnode->widget->type == type)
 367             {
 368                 (*wibox)->need_update = true;
 369                 break;
 370             }
 371 }
 372
 373 /** Set a wibox needs update because it has widget, or redraw a titlebar.
 374  * \param widget The widget to look for.
 375  */
 376 void
 377 widget_invalidate_bywidget(widget_t *widget)
 378 {
 379     foreach(wibox, globalconf.wiboxes)
 380         if(!(*wibox)->need_update)
 381             foreach(wnode, (*wibox)->widgets)
 382                 if(wnode->widget == widget)
 383                 {
 384                     (*wibox)->need_update = true;
 385                     break;
 386                 }
 387
 388     foreach(_c, globalconf.clients)
 389     {
 390         client_t *c = *_c;
 391         if(c->titlebar && !c->titlebar->need_update)
 392             for(int j = 0; j < c->titlebar->widgets.len; j++)
 393                 if(c->titlebar->widgets.tab[j].widget == widget)
 394                 {
 395                     c->titlebar->need_update = true;
 396                     break;
 397                 }
 398     }
 399 }
 400
 401 /** Create a new widget.
 402  * \param L The Lua VM state.
 403  *
 404  * \luastack
 405  * \lparam A table with at least a type value.
 406  * \lreturn A brand new widget.
 407  */
 408 static int
 409 luaA_widget_new(lua_State *L)
 410 {
 411     luaA_class_new(L, &widget_class);
 412
 413     widget_t *w = luaA_checkudata(L, -1, &widget_class);
 414     /* Set visible by default. */
 415     w->isvisible = true;
 416
 417     return 1;
 418 }
 419
 420 /** Get or set mouse buttons bindings to a widget.
 421  * \param L The Lua VM state.
 422  *
 423  * \luastack
 424  * \lvalue A widget.
 425  * \lparam An array of mouse button bindings objects, or nothing.
 426  * \return The array of mouse button bindings objects of this widget.
 427  */
 428 static int
 429 luaA_widget_buttons(lua_State *L)
 430 {
 431     widget_t *widget = luaA_checkudata(L, 1, &widget_class);
 432
 433     if(lua_gettop(L) == 2)
 434     {
 435         luaA_button_array_set(L, 1, 2, &widget->buttons);
 436         luaA_object_emit_signal(L, 1, "property::buttons", 0);
 437         return 1;
 438     }
 439
 440     return luaA_button_array_get(L, 1, &widget->buttons);
 441 }
 442
 443 /** Generic widget.
 444  * \param L The Lua VM state.
 445  * \return The number of elements pushed on stack.
 446  * \luastack
 447  * \lfield visible The widget visibility.
 448  * \lfield mouse_enter A function to execute when the mouse enter the widget.
 449  * \lfield mouse_leave A function to execute when the mouse leave the widget.
 450  */
 451 static int
 452 luaA_widget_index(lua_State *L)
 453 {
 454     size_t len;
 455     const char *prop = luaL_checklstring(L, 2, &len);
 456     awesome_token_t token = a_tokenize(prop, len);
 457
 458     /* Try standard method */
 459     if(luaA_class_index(L))
 460         return 1;
 461
 462     /* Then call special widget index */
 463     widget_t *widget = luaA_checkudata(L, 1, &widget_class);
 464     return widget->index ? widget->index(L, token) : 0;
 465 }
 466
 467 /** Generic widget newindex.
 468  * \param L The Lua VM state.
 469  * \return The number of elements pushed on stack.
 470  */
 471 static int
 472 luaA_widget_newindex(lua_State *L)
 473 {
 474     size_t len;
 475     const char *prop = luaL_checklstring(L, 2, &len);
 476     awesome_token_t token = a_tokenize(prop, len);
 477
 478     /* Try standard method */
 479     luaA_class_newindex(L);
 480
 481     /* Then call special widget newindex */
 482     widget_t *widget = luaA_checkudata(L, 1, &widget_class);
 483     return widget->newindex ? widget->newindex(L, token) : 0;
 484 }
 485
 486 static int
 487 luaA_widget_extents(lua_State *L)
 488 {
 489     widget_t *widget = luaA_checkudata(L, 1, &widget_class);
 490     area_t g = {
 491         .x = 0,
 492         .y = 0,
 493         .width = 0,
 494         .height = 0
 495     };
 496
 497     if(widget->extents)
 498         g = widget->extents(L, widget);
 499
 500     lua_newtable(L);
 501     lua_pushnumber(L, g.width);
 502     lua_setfield(L, -2, "width");
 503     lua_pushnumber(L, g.height);
 504     lua_setfield(L, -2, "height");
 505
 506     return 1;
 507 }
 508
 509 static int
 510 luaA_widget_set_type(lua_State *L, widget_t *w)
 511 {
 512     size_t len;
 513     const char *type = luaL_checklstring(L, -1, &len);
 514     widget_constructor_t *wc = NULL;
 515
 516     switch(a_tokenize(type, len))
 517     {
 518       case A_TK_TEXTBOX:
 519         wc = widget_textbox;
 520         break;
 521       case A_TK_PROGRESSBAR:
 522         wc = widget_progressbar;
 523         break;
 524       case A_TK_GRAPH:
 525         wc = widget_graph;
 526         break;
 527       case A_TK_SYSTRAY:
 528         wc = widget_systray;
 529         break;
 530       case A_TK_IMAGEBOX:
 531         wc = widget_imagebox;
 532         break;
 533       default:
 534         break;
 535     }
 536
 537     if(!wc)
 538         luaL_error(L, "unknown widget type: %s", type);
 539
 540     wc(w);
 541     w->type = wc;
 542     luaA_object_emit_signal(L, -3, "property::type", 0);
 543
 544     return 0;
 545 }
 546
 547 static int
 548 luaA_widget_get_visible(lua_State *L, widget_t *w)
 549 {
 550     lua_pushboolean(L, w->isvisible);
 551     return 1;
 552 }
 553
 554 static int
 555 luaA_widget_set_visible(lua_State *L, widget_t *w)
 556 {
 557     w->isvisible = luaA_checkboolean(L, -1);
 558     widget_invalidate_bywidget(w);
 559     luaA_object_emit_signal(L, -3, "property::visible", 0);
 560     return 0;
 561 }
 562
 563 void
 564 widget_class_setup(lua_State *L)
 565 {
 566     static const struct luaL_reg widget_methods[] =
 567     {
 568         LUA_CLASS_METHODS(widget)
 569         { "__call", luaA_widget_new },
 570         { NULL, NULL }
 571     };
 572
 573     static const struct luaL_reg widget_meta[] =
 574     {
 575         LUA_OBJECT_META(widget)
 576         { "buttons", luaA_widget_buttons },
 577         { "extents", luaA_widget_extents },
 578         { "__index", luaA_widget_index },
 579         { "__newindex", luaA_widget_newindex },
 580         { "__gc", luaA_widget_gc },
 581         { NULL, NULL }
 582     };
 583
 584     luaA_class_setup(L, &widget_class, "widget", (lua_class_allocator_t) widget_new,
 585                      NULL, NULL,
 586                      widget_methods, widget_meta);
 587     luaA_class_add_property(&widget_class, A_TK_VISIBLE,
 588                             (lua_class_propfunc_t) luaA_widget_set_visible,
 589                             (lua_class_propfunc_t) luaA_widget_get_visible,
 590                             (lua_class_propfunc_t) luaA_widget_set_visible);
 591     luaA_class_add_property(&widget_class, A_TK_TYPE,
 592                             (lua_class_propfunc_t) luaA_widget_set_type,
 593                             NULL,
 594                             NULL);
 595 }
 596
 597 // vim: filetype=c:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=80