clients/keyboard.c

   1 /*
   2  * Copyright © 2012 Openismus GmbH
   3  * Copyright © 2012 Intel Corporation
   4  *
   5  * Permission to use, copy, modify, distribute, and sell this software and
   6  * its documentation for any purpose is hereby granted without fee, provided
   7  * that the above copyright notice appear in all copies and that both that
   8  * copyright notice and this permission notice appear in supporting
   9  * documentation, and that the name of the copyright holders not be used in
  10  * advertising or publicity pertaining to distribution of the software
  11  * without specific, written prior permission.  The copyright holders make
  12  * no representations about the suitability of this software for any
  13  * purpose.  It is provided "as is" without express or implied warranty.
  14  *
  15  * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS
  16  * SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
  17  * FITNESS, IN NO EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY
  18  * SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER
  19  * RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF
  20  * CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
  21  * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  22  */
  23
  24 #include <stdio.h>
  25 #include <stdlib.h>
  26 #include <string.h>
  27
  28 #include <linux/input.h>
  29 #include <cairo.h>
  30
  31 #include "window.h"
  32 #include "input-method-client-protocol.h"
  33 #include "desktop-shell-client-protocol.h"
  34
  35 struct virtual_keyboard {
  36         struct input_panel *input_panel;
  37         struct input_method *input_method;
  38         struct input_method_context *context;
  39         struct display *display;
  40 };
  41
  42 enum key_type {
  43         keytype_default,
  44         keytype_backspace,
  45         keytype_enter,
  46         keytype_space,
  47         keytype_switch,
  48         keytype_symbols,
  49         keytype_tab
  50 };
  51
  52 struct key {
  53         enum key_type key_type;
  54
  55         char *label;
  56         char *alt;
  57
  58         unsigned int width;
  59 };
  60
  61 static const struct key keys[] = {
  62         { keytype_default, "q", "Q", 1},
  63         { keytype_default, "w", "W", 1},
  64         { keytype_default, "e", "E", 1},
  65         { keytype_default, "r", "R", 1},
  66         { keytype_default, "t", "T", 1},
  67         { keytype_default, "y", "Y", 1},
  68         { keytype_default, "u", "U", 1},
  69         { keytype_default, "i", "I", 1},
  70         { keytype_default, "o", "O", 1},
  71         { keytype_default, "p", "P", 1},
  72         { keytype_backspace, "<--", "<--", 2},
  73
  74         { keytype_tab, "->|", "->|", 1},
  75         { keytype_default, "a", "A", 1},
  76         { keytype_default, "s", "S", 1},
  77         { keytype_default, "d", "D", 1},
  78         { keytype_default, "f", "F", 1},
  79         { keytype_default, "g", "G", 1},
  80         { keytype_default, "h", "H", 1},
  81         { keytype_default, "j", "J", 1},
  82         { keytype_default, "k", "K", 1},
  83         { keytype_default, "l", "L", 1},
  84         { keytype_enter, "Enter", "Enter", 2},
  85
  86         { keytype_switch, "ABC", "abc", 2},
  87         { keytype_default, "z", "Z", 1},
  88         { keytype_default, "x", "X", 1},
  89         { keytype_default, "c", "C", 1},
  90         { keytype_default, "v", "V", 1},
  91         { keytype_default, "b", "B", 1},
  92         { keytype_default, "n", "N", 1},
  93         { keytype_default, "m", "M", 1},
  94         { keytype_default, ",", ",", 1},
  95         { keytype_default, ".", ".", 1},
  96         { keytype_switch, "ABC", "abc", 1},
  97
  98         { keytype_symbols, "?123", "?123", 2},
  99         { keytype_space, "", "", 8},
 100         { keytype_symbols, "?123", "?123", 2}
 101 };
 102
 103 static const unsigned int columns = 12;
 104 static const unsigned int rows = 4;
 105
 106 static const double key_width = 60;
 107 static const double key_height = 50;
 108
 109 enum keyboard_state {
 110         keyboardstate_default,
 111         keyboardstate_uppercase
 112 };
 113
 114 struct keyboard {
 115         struct virtual_keyboard *keyboard;
 116         struct window *window;
 117         struct widget *widget;
 118
 119         enum keyboard_state state;
 120 };
 121
 122 static void
 123 draw_key(const struct key *key,
 124          cairo_t *cr,
 125          enum keyboard_state state,
 126          unsigned int row,
 127          unsigned int col)
 128 {
 129         const char *label;
 130         cairo_text_extents_t extents;
 131
 132         cairo_save(cr);
 133         cairo_rectangle(cr,
 134                         col * key_width, row * key_height,
 135                         key->width * key_width, key_height);
 136         cairo_clip(cr);
 137
 138         /* Paint frame */
 139         cairo_rectangle(cr,
 140                         col * key_width, row * key_height,
 141                         key->width * key_width, key_height);
 142         cairo_set_line_width(cr, 3);
 143         cairo_stroke(cr);
 144
 145         /* Paint text */
 146         label = state == keyboardstate_default ? key->label : key->alt;
 147         cairo_text_extents(cr, label, &extents);
 148
 149         cairo_translate(cr,
 150                         col * key_width,
 151                         row * key_height);
 152         cairo_translate(cr,
 153                         (key->width * key_width - extents.width) / 2,
 154                         (key_height - extents.y_bearing) / 2);
 155         cairo_show_text(cr, label);
 156
 157         cairo_restore(cr);
 158 }
 159
 160 static void
 161 redraw_handler(struct widget *widget, void *data)
 162 {
 163         struct keyboard *keyboard = data;
 164         cairo_surface_t *surface;
 165         struct rectangle allocation;
 166         cairo_t *cr;
 167         unsigned int i;
 168         unsigned int row = 0, col = 0;
 169
 170         surface = window_get_surface(keyboard->window);
 171         widget_get_allocation(keyboard->widget, &allocation);
 172
 173         cr = cairo_create(surface);
 174         cairo_rectangle(cr, allocation.x, allocation.y, allocation.width, allocation.height);
 175         cairo_clip(cr);
 176
 177         cairo_select_font_face(cr, "sans", CAIRO_FONT_SLANT_NORMAL, CAIRO_FONT_WEIGHT_BOLD);
 178         cairo_set_font_size(cr, 16);
 179
 180         cairo_translate(cr, allocation.x, allocation.y);
 181
 182         cairo_set_operator(cr, CAIRO_OPERATOR_SOURCE);
 183         cairo_set_source_rgba(cr, 1, 1, 1, 0.75);
 184         cairo_rectangle(cr, 0, 0, columns * key_width, rows * key_height);
 185         cairo_paint(cr);
 186
 187         cairo_set_operator(cr, CAIRO_OPERATOR_OVER);
 188
 189         for (i = 0; i < sizeof(keys) / sizeof(*keys); ++i) {
 190                 cairo_set_source_rgb(cr, 0, 0, 0);
 191                 draw_key(&keys[i], cr, keyboard->state, row, col);
 192                 col += keys[i].width;
 193                 if (col >= columns) {
 194                         row += 1;
 195                         col = 0;
 196                 }
 197         }
 198
 199         cairo_destroy(cr);
 200         cairo_surface_destroy(surface);
 201 }
 202
 203 static void
 204 resize_handler(struct widget *widget,
 205                int32_t width, int32_t height, void *data)
 206 {
 207         /* struct keyboard *keyboard = data; */
 208 }
 209
 210 static void
 211 keyboard_handle_key(struct keyboard *keyboard, const struct key *key)
 212 {
 213         const char *label = keyboard->state == keyboardstate_default ? key->label : key->alt;
 214
 215         switch (key->key_type) {
 216                 case keytype_default:
 217                         input_method_context_commit_string(keyboard->keyboard->context,
 218                                                            label, -1);
 219                         break;
 220                 case keytype_backspace:
 221                         break;
 222                 case keytype_enter:
 223                         break;
 224                 case keytype_space:
 225                         input_method_context_commit_string(keyboard->keyboard->context,
 226                                                            " ", -1);
 227                         break;
 228                 case keytype_switch:
 229                         if (keyboard->state == keyboardstate_default)
 230                                 keyboard->state = keyboardstate_uppercase;
 231                         else
 232                                 keyboard->state = keyboardstate_default;
 233                         break;
 234                 case keytype_symbols:
 235                         break;
 236                 case keytype_tab:
 237                         break;
 238         }
 239 }
 240
 241 static void
 242 button_handler(struct widget *widget,
 243                struct input *input, uint32_t time,
 244                uint32_t button,
 245                enum wl_pointer_button_state state, void *data)
 246 {
 247         struct keyboard *keyboard = data;
 248         struct rectangle allocation;
 249         int32_t x, y;
 250         int row, col;
 251         unsigned int i;
 252
 253         if (state != WL_POINTER_BUTTON_STATE_PRESSED || button != BTN_LEFT) {
 254                 return;
 255         }
 256
 257         input_get_position(input, &x, &y);
 258
 259         widget_get_allocation(keyboard->widget, &allocation);
 260         x -= allocation.x;
 261         y -= allocation.y;
 262
 263         row = y / key_height;
 264         col = x / key_width + row * columns;
 265         for (i = 0; i < sizeof(keys) / sizeof(*keys); ++i) {
 266                 col -= keys[i].width;
 267                 if (col < 0)
 268                         break;
 269         }
 270
 271         keyboard_handle_key(keyboard, &keys[i]);
 272
 273         widget_schedule_redraw(widget);
 274 }
 275
 276 static void
 277 input_method_context_surrounding_text(void *data,
 278                                       struct input_method_context *context,
 279                                       const char *text,
 280                                       uint32_t cursor,
 281                                       uint32_t anchor)
 282 {
 283         fprintf(stderr, "Surrounding text updated: %s\n", text);
 284 }
 285
 286 static const struct input_method_context_listener input_method_context_listener = {
 287         input_method_context_surrounding_text,
 288 };
 289
 290 static void
 291 input_method_activate(void *data,
 292                       struct input_method *input_method,
 293                       struct input_method_context *context)
 294 {
 295         struct virtual_keyboard *keyboard = data;
 296
 297         if (keyboard->context)
 298                 input_method_context_destroy(keyboard->context);
 299
 300         keyboard->context = context;
 301         input_method_context_add_listener(context,
 302                                           &input_method_context_listener,
 303                                           keyboard);
 304 }
 305
 306 static void
 307 input_method_deactivate(void *data,
 308                         struct input_method *input_method,
 309                         struct input_method_context *context)
 310 {
 311         struct virtual_keyboard *keyboard = data;
 312
 313         if (!keyboard->context)
 314                 return;
 315
 316         input_method_context_destroy(keyboard->context);
 317         keyboard->context = NULL;
 318 }
 319
 320 static const struct input_method_listener input_method_listener = {
 321         input_method_activate,
 322         input_method_deactivate
 323 };
 324
 325 static void
 326 global_handler(struct wl_display *display, uint32_t id,
 327                const char *interface, uint32_t version, void *data)
 328 {
 329         struct virtual_keyboard *keyboard = data;
 330
 331         if (!strcmp(interface, "input_panel")) {
 332                 keyboard->input_panel = wl_display_bind(display, id, &input_panel_interface);
 333         } else if (!strcmp(interface, "input_method")) {
 334                 keyboard->input_method = wl_display_bind(display, id, &input_method_interface);
 335                 input_method_add_listener(keyboard->input_method, &input_method_listener, keyboard);
 336         }
 337 }
 338
 339 static void
 340 keyboard_create(struct output *output, struct virtual_keyboard *virtual_keyboard)
 341 {
 342         struct keyboard *keyboard;
 343
 344         keyboard = malloc(sizeof *keyboard);
 345         memset(keyboard, 0, sizeof *keyboard);
 346
 347         keyboard->keyboard = virtual_keyboard;
 348         keyboard->window = window_create_custom(virtual_keyboard->display);
 349         keyboard->widget = window_add_widget(keyboard->window, keyboard);
 350
 351         window_set_title(keyboard->window, "Virtual keyboard");
 352         window_set_user_data(keyboard->window, keyboard);
 353
 354         widget_set_redraw_handler(keyboard->widget, redraw_handler);
 355         widget_set_resize_handler(keyboard->widget, resize_handler);
 356         widget_set_button_handler(keyboard->widget, button_handler);
 357
 358         window_schedule_resize(keyboard->window,
 359                                columns * key_width,
 360                                rows * key_height);
 361
 362         input_panel_set_surface(virtual_keyboard->input_panel,
 363                                 window_get_wl_surface(keyboard->window),
 364                                 output_get_wl_output(output));
 365 }
 366
 367 static void
 368 handle_output_configure(struct output *output, void *data)
 369 {
 370         struct virtual_keyboard *virtual_keyboard = data;
 371
 372         /* skip existing outputs */
 373         if (output_get_user_data(output))
 374                 return;
 375
 376         output_set_user_data(output, virtual_keyboard);
 377
 378         keyboard_create(output, virtual_keyboard);
 379 }
 380
 381 int
 382 main(int argc, char *argv[])
 383 {
 384         struct virtual_keyboard virtual_keyboard;
 385
 386         virtual_keyboard.display = display_create(argc, argv);
 387         if (virtual_keyboard.display == NULL) {
 388                 fprintf(stderr, "failed to create display: %m\n");
 389                 return -1;
 390         }
 391
 392         virtual_keyboard.context = NULL;
 393
 394         wl_display_add_global_listener(display_get_display(virtual_keyboard.display),
 395                                        global_handler, &virtual_keyboard);
 396
 397         display_set_user_data(virtual_keyboard.display, &virtual_keyboard);
 398         display_set_output_configure_handler(virtual_keyboard.display, handle_output_configure);
 399
 400         display_run(virtual_keyboard.display);
 401
 402         return 0;
 403 }