modules/minibuffer.js

   1 /**
   2  * (C) Copyright 2007-2008 Jeremy Maitin-Shepard
   3  * (C) Copyright 2009 John J. Foerch
   4  *
   5  * Use, modification, and distribution are subject to the terms specified in the
   6  * COPYING file.
   7 **/
   8
   9 in_module(null);
  10
  11 // This should only be used for minibuffer states where it makes
  12 // sense.  In particular, it should not be used if additional cleanup
  13 // must be done.
  14 function minibuffer_abort (window) {
  15     var m = window.minibuffer;
  16     var s = m.current_state;
  17     if (s == null)
  18         throw "Invalid minibuffer state";
  19     m.pop_state();
  20     input_sequence_abort.call(window);
  21 }
  22 interactive("minibuffer-abort", null, function (I) { minibuffer_abort(I.window); });
  23
  24 define_builtin_commands("minibuffer-",
  25     function (I, command) {
  26         try {
  27             var m = I.minibuffer;
  28             if (m._input_mode_enabled) {
  29                 m._restore_normal_state();
  30                 var e = m.input_element;
  31                 var c = e.controllers.getControllerForCommand(command);
  32                 try {
  33                     m.ignore_input_events = true;
  34                     if (c && c.isCommandEnabled(command))
  35                         c.doCommand(command);
  36                 } finally {
  37                     m.ignore_input_events = false;
  38                 }
  39                 var s = m.current_state;
  40                 if (s.ran_minibuffer_command)
  41                     s.ran_minibuffer_command(m, command);
  42             }
  43         } catch (e) {
  44             /* Ignore exceptions. */
  45         }
  46     },
  47     function (I) { //XXX: need return??
  48         I.minibuffer.current_state.mark_active = !I.minibuffer.current_state.mark_active;
  49     },
  50     function (I) I.minibuffer.current_state.mark_active,
  51     false);
  52
  53
  54 /**
  55  * minibuffer_state: abstact base class for minibuffer states.
  56  */
  57 function minibuffer_state (keymap, use_input_mode) {
  58     this.keymap = keymap;
  59     this.use_input_mode = use_input_mode;
  60 }
  61 minibuffer_state.prototype = {
  62     load: function () {},
  63     unload: function () {},
  64     destroy: function () {}
  65 };
  66
  67
  68 function minibuffer_message_state (keymap, message, destroy_function) {
  69     minibuffer_state.call(this, keymap, false);
  70     this._message = message;
  71     if (destroy_function)
  72         this.destroy = destroy_function;
  73 }
  74 minibuffer_message_state.prototype = {
  75     __proto__: minibuffer_state.prototype,
  76     load: function (window) {
  77         minibuffer_state.prototype.load.call(this, window);
  78         this.window = window;
  79     },
  80     unload: function (window) {
  81         this.window = null;
  82         minibuffer_state.prototype.unload.call(this, window);
  83     },
  84     get message () { return this._message; },
  85     set message (x) {
  86         if (this.window) {
  87             this.window.minibuffer._restore_normal_state();
  88             this.window.minibuffer._show(this._message);
  89         }
  90     }
  91 };
  92
  93
  94 function minibuffer_input_state (window, keymap, prompt, input, selection_start, selection_end) {
  95     minibuffer_state.call(this, keymap, true);
  96     this.prompt = prompt;
  97     if (input)
  98         this.input = input;
  99     else
 100         this.input = "";
 101     if (selection_start)
 102         this.selection_start = selection_start;
 103     else
 104         this.selection_start = 0;
 105     if (selection_end)
 106         this.selection_end = selection_end;
 107     else
 108         this.selection_end = this.selection_start;
 109     window.input.begin_recursion();
 110 }
 111 minibuffer_input_state.prototype = {
 112     __proto__: minibuffer_state.prototype,
 113     mark_active : false,
 114     destroy: function (window) {
 115         window.input.end_recursion();
 116         minibuffer_state.prototype.destroy.call(this, window);
 117     }
 118 };
 119
 120
 121 /**
 122  * The parameter `args' is an object specifying the arguments for
 123  * basic_minibuffer_state.  The following properties of args must/may
 124  * be set:
 125  *
 126  * prompt:            [required]
 127  *
 128  * initial_value:     [optional] specifies the initial text
 129  *
 130  * select:            [optional] specifies to select the initial text if set to non-null
 131  */
 132 define_keywords("$keymap", "$prompt", "$initial_value", "$select");
 133 function basic_minibuffer_state (window) {
 134     keywords(arguments, $keymap = minibuffer_base_keymap);
 135     var initial_value = arguments.$initial_value || "";
 136     var sel_start, sel_end;
 137     if (arguments.$select) {
 138         sel_start = 0;
 139         sel_end = initial_value.length;
 140     } else {
 141         sel_start = sel_end = initial_value.length;
 142     }
 143     minibuffer_input_state.call(this, window, arguments.$keymap,
 144                                 arguments.$prompt, initial_value,
 145                                 sel_start, sel_end);
 146 }
 147 basic_minibuffer_state.prototype.__proto__ = minibuffer_input_state.prototype;
 148
 149
 150 define_variable("minibuffer_input_mode_show_message_timeout", 1000,
 151     "Time duration (in milliseconds) to flash minibuffer messages while in "+
 152     "minibuffer input mode.");
 153
 154
 155 function minibuffer (window) {
 156     this.element = window.document.getElementById("minibuffer");
 157     this.output_element = window.document.getElementById("minibuffer-message");
 158     this.input_prompt_element = window.document.getElementById("minibuffer-prompt");
 159     this.input_element = window.document.getElementById("minibuffer-input");
 160     var m = this;
 161     this.input_element.inputField.addEventListener("blur",
 162         function () {
 163             if (m.active && m._input_mode_enabled && !m._showing_message) {
 164                 window.setTimeout(function () {
 165                         m.input_element.inputField.focus();
 166                     }, 0);
 167             }
 168         }, false);
 169     this.input_element.addEventListener("input",
 170         function (e) {
 171             if (m.ignore_input_events || !m._input_mode_enabled)
 172                 return;
 173             var s = m.current_state;
 174             if (s) {
 175                 if (s.handle_input)
 176                     s.handle_input(m);
 177             }
 178         }, true);
 179
 180     // Ensure that the input area will have focus if a message is
 181     // currently being flashed so that the default handler for key
 182     // events will properly add text to the input area.
 183     window.addEventListener("keydown",
 184         function (e) {
 185             if (m._input_mode_enabled && m._showing_message)
 186                 m._restore_normal_state();
 187         }, true);
 188     this.window = window;
 189     this.last_message = "";
 190     this.states = [];
 191 }
 192
 193 minibuffer.prototype = {
 194     constructor: minibuffer.constructor,
 195     get _selection_start () { return this.input_element.selectionStart; },
 196     get _selection_end () { return this.input_element.selectionEnd; },
 197     get _input_text () { return this.input_element.value; },
 198     set _input_text (text) { this.input_element.value = text; },
 199     get prompt () { return this.input_prompt_element.value; },
 200     set prompt (s) { this.input_prompt_element.value = s; },
 201
 202     set_input_state: function (x) {
 203         this._input_text = x[0];
 204         this._set_selection(x[1], x[2]);
 205     },
 206
 207     _set_selection: function (start, end) {
 208         if (start == null)
 209             start = this._input_text.length;
 210         if (end == null)
 211             end = this._input_text.length;
 212         this.input_element.setSelectionRange(start,end);
 213     },
 214
 215     /* Saved focus state */
 216     saved_focused_frame: null,
 217     saved_focused_element: null,
 218
 219     default_message: "",
 220
 221     current_message: null,
 222
 223     /* This method will display the specified string in the
 224      * minibuffer, without recording it in any log/Messages buffer. */
 225     show: function (str, force) {
 226         if (!this.active || force) {
 227             this.current_message = str;
 228             this._show(str);
 229         }
 230     },
 231
 232     _show: function (str, force) {
 233         if (this.last_message != str) {
 234             this.output_element.value = str;
 235             this.last_message = str;
 236         }
 237     },
 238
 239     message: function (str) {
 240         /* TODO: add the message to a *Messages* buffer, and/or
 241          * possibly dump them to the console. */
 242         this.show(str, true /* force */);
 243
 244         if (str.length > 0 && this.active)
 245             this._flash_temporary_message();
 246     },
 247
 248     clear: function () {
 249         this.current_message = null;
 250         if (!this.active)
 251             this._show(this.default_message);
 252     },
 253
 254     set_default_message: function (str) {
 255         this.default_message = str;
 256         if (this.current_message == null)
 257             this._show(str);
 258     },
 259
 260     get current_state () {
 261         if (this.states.length == 0)
 262             return null;
 263         return this.states[this.states.length - 1];
 264     },
 265
 266     push_state: function (state) {
 267         this._save_state();
 268         this.states.push(state);
 269         this._restore_state();
 270     },
 271
 272     pop_state: function () {
 273         this.current_state.destroy(this.window);
 274         this.states.pop();
 275         this._restore_state();
 276     },
 277
 278     pop_all: function () {
 279         while (this.states.length > 0) {
 280             this.current_state.destroy(this.window);
 281             this.states.pop();
 282         }
 283     },
 284
 285     remove_state: function (state) {
 286         var i = this.states.indexOf(state);
 287         if (i == -1)
 288             return;
 289         var was_current = (i == (this.states.length - 1));
 290         state.destroy(this.window);
 291         this.states.splice(i, 1);
 292         if (was_current)
 293             this._restore_state();
 294     },
 295
 296     _input_mode_enabled: false,
 297
 298     active: false,
 299
 300     /* If _input_mode_enabled is true, this is set to indicate that
 301      * the message area is being temporarily shown instead of the
 302      * input box. */
 303     _showing_message: false,
 304
 305     _message_timer_ID: null,
 306
 307     /* This must only be called if _input_mode_enabled is true */
 308     //XXX: if it must only be called if _input_mode_enabled is true,
 309     //     then why does it have an else condition?
 310     _restore_normal_state: function () {
 311         if (this._showing_message) {
 312             this.window.clearTimeout(this._message_timer_ID);
 313             this._message_timer_ID = null;
 314             this._showing_message = false;
 315
 316             if (this._input_mode_enabled)
 317                 this._switch_to_input_mode();
 318             else
 319                 // assumes that anything other than an input state is a
 320                 // minibuffer_message_state.
 321                 this._show(this.current_state._message);
 322         }
 323     },
 324
 325     /* This must only be called if _input_mode_enabled is true */
 326     _flash_temporary_message: function () {
 327         if (this._showing_message)
 328             this.window.clearTimeout(this._message_timer_ID);
 329         else {
 330             this._showing_message = true;
 331             if (this._input_mode_enabled)
 332                 this._switch_to_message_mode();
 333         }
 334         var obj = this;
 335         this._message_timer_ID = this.window.setTimeout(function () {
 336             obj._restore_normal_state();
 337         }, minibuffer_input_mode_show_message_timeout);
 338     },
 339
 340     _switch_to_input_mode: function () {
 341         this.element.setAttribute("minibuffermode", "input");
 342         this.input_element.inputField.focus();
 343     },
 344
 345     _switch_to_message_mode: function () {
 346         this.element.setAttribute("minibuffermode", "message");
 347     },
 348
 349     _restore_state: function () {
 350         var s = this.current_state;
 351         var want_input_mode = false;
 352         if (s) {
 353             if (!this.active) {
 354                 this.saved_focused_frame = this.window.document.commandDispatcher.focusedWindow;
 355                 this.saved_focused_element = this.window.document.commandDispatcher.focusedElement;
 356             }
 357             if (s.use_input_mode) {
 358                 want_input_mode = true;
 359                 this._input_text = s.input;
 360                 this.prompt = s.prompt;
 361                 this._set_selection(s.selection_start, s.selection_end);
 362             } else {
 363                 this._show(s._message);
 364             }
 365             s.load(this.window);
 366             this.window.input.current.override_keymap = s.keymap;
 367             this.active = true;
 368         } else {
 369             if (this.active) {
 370                 this.active = false;
 371                 this.window.input.current.override_keymap = null;
 372                 if (this.saved_focused_element)
 373                     set_focus_no_scroll(this.window, this.saved_focused_element);
 374                 else if (this.saved_focused_frame)
 375                     set_focus_no_scroll(this.window, this.saved_focused_frame);
 376                 this.saved_focused_element = null;
 377                 this.saved_focused_frame = null;
 378                 this._show(this.current_message || this.default_message);
 379             }
 380         }
 381         var in_input_mode = this._input_mode_enabled && !this._showing_message;
 382         if (this._showing_message) {
 383             this.window.clearTimeout(this._message_timer_ID);
 384             this._message_timer_ID = null;
 385             this._showing_message = false;
 386         }
 387         if (want_input_mode && !in_input_mode)
 388             this._switch_to_input_mode();
 389         else if (!want_input_mode && in_input_mode)
 390             this._switch_to_message_mode();
 391         this._input_mode_enabled = want_input_mode;
 392     },
 393
 394     _save_state: function () {
 395         var s = this.current_state;
 396         if (s) {
 397             if (s.use_input_mode) {
 398                 s.input = this._input_text;
 399                 s.prompt = this.prompt;
 400                 s.selection_start = this._selection_start;
 401                 s.selection_end = this._selection_end;
 402             }
 403             s.unload(this.window);
 404         }
 405     },
 406
 407     insert_before: function (element) {
 408         this.element.parentNode.insertBefore(element, this.element);
 409     }
 410 };
 411
 412
 413 function minibuffer_initialize_window (window) {
 414     window.minibuffer = new minibuffer(window);
 415 }
 416 add_hook("window_initialize_early_hook", minibuffer_initialize_window);
 417
 418
 419 function minibuffer_window_close_handler (window) {
 420     window.minibuffer.pop_all();
 421 }
 422 add_hook("window_close_hook", minibuffer_window_close_handler);
 423
 424
 425 /* Note: This is concise, but doesn't seem to be useful in practice,
 426  * because nothing can be done with the state alone. */
 427 minibuffer.prototype.check_state = function (type) {
 428     var s = this.current_state;
 429     if (!(s instanceof type))
 430         throw new Error("Invalid minibuffer state.");
 431     return s;
 432 };
 433
 434 minibuffer.prototype.show_wait_message = function (initial_message, destroy_function) {
 435     var s = new minibuffer_message_state(minibuffer_message_keymap, initial_message, destroy_function);
 436     this.push_state(s);
 437     return s;
 438 };
 439
 440 minibuffer.prototype.wait_for = function (message, coroutine) {
 441     var cc = yield CONTINUATION;
 442     var done = false;
 443     var s = this.show_wait_message(message, function () { if (!done) cc.throw(abort()); });
 444     var result;
 445     try {
 446         result = yield coroutine;
 447     } finally {
 448         done = true;
 449         this.remove_state(s);
 450     }
 451     yield co_return(result);
 452 };
 453
 454 provide("minibuffer");