Files @ r24171:b76f3d07eedd
Branch filter:

Location: cpp/openttd-patchpack/source/src/textbuf.cpp

glx
Codechange: Use a dynamic copyright year
  1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
/*
 * This file is part of OpenTTD.
 * OpenTTD is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, version 2.
 * OpenTTD is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 * See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with OpenTTD. If not, see <http://www.gnu.org/licenses/>.
 */

/** @file textbuf.cpp Textbuffer handling. */

#include "stdafx.h"
#include <stdarg.h>

#include "textbuf_type.h"
#include "string_func.h"
#include "strings_func.h"
#include "gfx_type.h"
#include "gfx_func.h"
#include "window_func.h"
#include "core/alloc_func.hpp"

#include "safeguards.h"

/**
 * Try to retrieve the current clipboard contents.
 *
 * @note OS-specific function.
 * @param buffer Clipboard content.
 * @param last The pointer to the last element of the destination buffer
 * @return True if some text could be retrieved.
 */
bool GetClipboardContents(char *buffer, const char *last);

int _caret_timer;


/**
 * Checks if it is possible to delete a character.
 * @param backspace if set, delete the character before the caret,
 * otherwise, delete the character after it.
 * @return true if a character can be deleted in the given direction.
 */
bool Textbuf::CanDelChar(bool backspace)
{
	return backspace ? this->caretpos != 0 : this->caretpos < this->bytes - 1;
}

/**
 * Delete a character from a textbuffer, either with 'Delete' or 'Backspace'
 * The character is delete from the position the caret is at
 * @param keycode Type of deletion, either WKC_BACKSPACE or WKC_DELETE
 * @return Return true on successful change of Textbuf, or false otherwise
 */
bool Textbuf::DeleteChar(uint16 keycode)
{
	bool word = (keycode & WKC_CTRL) != 0;

	keycode &= ~WKC_SPECIAL_KEYS;
	if (keycode != WKC_BACKSPACE && keycode != WKC_DELETE) return false;

	bool backspace = keycode == WKC_BACKSPACE;

	if (!CanDelChar(backspace)) return false;

	char *s = this->buf + this->caretpos;
	uint16 len = 0;

	if (word) {
		/* Delete a complete word. */
		if (backspace) {
			/* Delete whitespace and word in front of the caret. */
			len = this->caretpos - (uint16)this->char_iter->Prev(StringIterator::ITER_WORD);
			s -= len;
		} else {
			/* Delete word and following whitespace following the caret. */
			len = (uint16)this->char_iter->Next(StringIterator::ITER_WORD) - this->caretpos;
		}
		/* Update character count. */
		for (const char *ss = s; ss < s + len; Utf8Consume(&ss)) {
			this->chars--;
		}
	} else {
		/* Delete a single character. */
		if (backspace) {
			/* Delete the last code point in front of the caret. */
			s = Utf8PrevChar(s);
			WChar c;
			len = (uint16)Utf8Decode(&c, s);
			this->chars--;
		} else {
			/* Delete the complete character following the caret. */
			len = (uint16)this->char_iter->Next(StringIterator::ITER_CHARACTER) - this->caretpos;
			/* Update character count. */
			for (const char *ss = s; ss < s + len; Utf8Consume(&ss)) {
				this->chars--;
			}
		}
	}

	/* Move the remaining characters over the marker */
	memmove(s, s + len, this->bytes - (s - this->buf) - len);
	this->bytes -= len;

	if (backspace) this->caretpos -= len;

	this->UpdateStringIter();
	this->UpdateWidth();
	this->UpdateCaretPosition();
	this->UpdateMarkedText();

	return true;
}

/**
 * Delete every character in the textbuffer
 */
void Textbuf::DeleteAll()
{
	memset(this->buf, 0, this->max_bytes);
	this->bytes = this->chars = 1;
	this->pixels = this->caretpos = this->caretxoffs = 0;
	this->markpos = this->markend = this->markxoffs = this->marklength = 0;
	this->UpdateStringIter();
}

/**
 * Insert a character to a textbuffer. If maxwidth of the Textbuf is zero,
 * we don't care about the visual-length but only about the physical
 * length of the string
 * @param key Character to be inserted
 * @return Return true on successful change of Textbuf, or false otherwise
 */
bool Textbuf::InsertChar(WChar key)
{
	uint16 len = (uint16)Utf8CharLen(key);
	if (this->bytes + len <= this->max_bytes && this->chars + 1 <= this->max_chars) {
		memmove(this->buf + this->caretpos + len, this->buf + this->caretpos, this->bytes - this->caretpos);
		Utf8Encode(this->buf + this->caretpos, key);
		this->chars++;
		this->bytes    += len;
		this->caretpos += len;

		this->UpdateStringIter();
		this->UpdateWidth();
		this->UpdateCaretPosition();
		this->UpdateMarkedText();
		return true;
	}
	return false;
}

/**
 * Insert a string into the text buffer. If maxwidth of the Textbuf is zero,
 * we don't care about the visual-length but only about the physical
 * length of the string.
 * @param str String to insert.
 * @param marked Replace the currently marked text with the new text.
 * @param caret Move the caret to this point in the insertion string.
 * @param insert_location Position at which to insert the string.
 * @param replacement_end Replace all characters from #insert_location up to this location with the new string.
 * @return True on successful change of Textbuf, or false otherwise.
 */
bool Textbuf::InsertString(const char *str, bool marked, const char *caret, const char *insert_location, const char *replacement_end)
{
	uint16 insertpos = (marked && this->marklength != 0) ? this->markpos : this->caretpos;
	if (insert_location != nullptr) {
		insertpos = insert_location - this->buf;
		if (insertpos > this->bytes) return false;

		if (replacement_end != nullptr) {
			this->DeleteText(insertpos, replacement_end - this->buf, str == nullptr);
		}
	} else {
		if (marked) this->DiscardMarkedText(str == nullptr);
	}

	if (str == nullptr) return false;

	uint16 bytes = 0, chars = 0;
	WChar c;
	for (const char *ptr = str; (c = Utf8Consume(&ptr)) != '\0';) {
		if (!IsValidChar(c, this->afilter)) break;

		byte len = Utf8CharLen(c);
		if (this->bytes + bytes + len > this->max_bytes) break;
		if (this->chars + chars + 1   > this->max_chars) break;

		bytes += len;
		chars++;

		/* Move caret if needed. */
		if (ptr == caret) this->caretpos = insertpos + bytes;
	}

	if (bytes == 0) return false;

	if (marked) {
		this->markpos = insertpos;
		this->markend = insertpos + bytes;
	}

	memmove(this->buf + insertpos + bytes, this->buf + insertpos, this->bytes - insertpos);
	memcpy(this->buf + insertpos, str, bytes);

	this->bytes += bytes;
	this->chars += chars;
	if (!marked && caret == nullptr) this->caretpos += bytes;
	assert(this->bytes <= this->max_bytes);
	assert(this->chars <= this->max_chars);
	this->buf[this->bytes - 1] = '\0'; // terminating zero

	this->UpdateStringIter();
	this->UpdateWidth();
	this->UpdateCaretPosition();
	this->UpdateMarkedText();

	return true;
}

/**
 * Insert a chunk of text from the clipboard onto the textbuffer. Get TEXT clipboard
 * and append this up to the maximum length (either absolute or screenlength). If maxlength
 * is zero, we don't care about the screenlength but only about the physical length of the string
 * @return true on successful change of Textbuf, or false otherwise
 */
bool Textbuf::InsertClipboard()
{
	char utf8_buf[512];

	if (!GetClipboardContents(utf8_buf, lastof(utf8_buf))) return false;

	return this->InsertString(utf8_buf, false);
}

/**
 * Delete a part of the text.
 * @param from Start of the text to delete.
 * @param to End of the text to delete.
 * @param update Set to true if the internal state should be updated.
 */
void Textbuf::DeleteText(uint16 from, uint16 to, bool update)
{
	uint c = 0;
	const char *s = this->buf + from;
	while (s < this->buf + to) {
		Utf8Consume(&s);
		c++;
	}

	/* Strip marked characters from buffer. */
	memmove(this->buf + from, this->buf + to, this->bytes - to);
	this->bytes -= to - from;
	this->chars -= c;

	/* Fixup caret if needed. */
	if (this->caretpos > from) {
		if (this->caretpos <= to) {
			this->caretpos = from;
		} else {
			this->caretpos -= to - from;
		}
	}

	if (update) {
		this->UpdateStringIter();
		this->UpdateCaretPosition();
		this->UpdateMarkedText();
	}
}

/**
 * Discard any marked text.
 * @param update Set to true if the internal state should be updated.
 */
void Textbuf::DiscardMarkedText(bool update)
{
	if (this->markend == 0) return;

	this->DeleteText(this->markpos, this->markend, update);
	this->markpos = this->markend = this->markxoffs = this->marklength = 0;
}

/** Update the character iter after the text has changed. */
void Textbuf::UpdateStringIter()
{
	this->char_iter->SetString(this->buf);
	size_t pos = this->char_iter->SetCurPosition(this->caretpos);
	this->caretpos = pos == StringIterator::END ? 0 : (uint16)pos;
}

/** Update pixel width of the text. */
void Textbuf::UpdateWidth()
{
	this->pixels = GetStringBoundingBox(this->buf, FS_NORMAL).width;
}

/** Update pixel position of the caret. */
void Textbuf::UpdateCaretPosition()
{
	this->caretxoffs = this->chars > 1 ? GetCharPosInString(this->buf, this->buf + this->caretpos, FS_NORMAL).x : 0;
}

/** Update pixel positions of the marked text area. */
void Textbuf::UpdateMarkedText()
{
	if (this->markend != 0) {
		this->markxoffs  = GetCharPosInString(this->buf, this->buf + this->markpos, FS_NORMAL).x;
		this->marklength = GetCharPosInString(this->buf, this->buf + this->markend, FS_NORMAL).x - this->markxoffs;
	} else {
		this->markxoffs = this->marklength = 0;
	}
}

/**
 * Handle text navigation with arrow keys left/right.
 * This defines where the caret will blink and the next character interaction will occur
 * @param keycode Direction in which navigation occurs (WKC_CTRL |) WKC_LEFT, (WKC_CTRL |) WKC_RIGHT, WKC_END, WKC_HOME
 * @return Return true on successful change of Textbuf, or false otherwise
 */
bool Textbuf::MovePos(uint16 keycode)
{
	switch (keycode) {
		case WKC_LEFT:
		case WKC_CTRL | WKC_LEFT: {
			if (this->caretpos == 0) break;

			size_t pos = this->char_iter->Prev(keycode & WKC_CTRL ? StringIterator::ITER_WORD : StringIterator::ITER_CHARACTER);
			if (pos == StringIterator::END) return true;

			this->caretpos = (uint16)pos;
			this->UpdateCaretPosition();
			return true;
		}

		case WKC_RIGHT:
		case WKC_CTRL | WKC_RIGHT: {
			if (this->caretpos >= this->bytes - 1) break;

			size_t pos = this->char_iter->Next(keycode & WKC_CTRL ? StringIterator::ITER_WORD : StringIterator::ITER_CHARACTER);
			if (pos == StringIterator::END) return true;

			this->caretpos = (uint16)pos;
			this->UpdateCaretPosition();
			return true;
		}

		case WKC_HOME:
			this->caretpos = 0;
			this->char_iter->SetCurPosition(this->caretpos);
			this->UpdateCaretPosition();
			return true;

		case WKC_END:
			this->caretpos = this->bytes - 1;
			this->char_iter->SetCurPosition(this->caretpos);
			this->UpdateCaretPosition();
			return true;

		default:
			break;
	}

	return false;
}

/**
 * Initialize the textbuffer by supplying it the buffer to write into
 * and the maximum length of this buffer
 * @param max_bytes maximum size in bytes, including terminating '\0'
 * @param max_chars maximum size in chars, including terminating '\0'
 */
Textbuf::Textbuf(uint16 max_bytes, uint16 max_chars)
	: buf(MallocT<char>(max_bytes))
{
	assert(max_bytes != 0);
	assert(max_chars != 0);

	this->char_iter = StringIterator::Create();

	this->afilter    = CS_ALPHANUMERAL;
	this->max_bytes  = max_bytes;
	this->max_chars  = max_chars == UINT16_MAX ? max_bytes : max_chars;
	this->caret      = true;
	this->DeleteAll();
}

Textbuf::~Textbuf()
{
	delete this->char_iter;
	free(this->buf);
}

/**
 * Render a string into the textbuffer.
 * @param string String
 */
void Textbuf::Assign(StringID string)
{
	GetString(this->buf, string, &this->buf[this->max_bytes - 1]);
	this->UpdateSize();
}

/**
 * Copy a string into the textbuffer.
 * @param text Source.
 */
void Textbuf::Assign(const char *text)
{
	strecpy(this->buf, text, &this->buf[this->max_bytes - 1]);
	this->UpdateSize();
}

/**
 * Print a formatted string into the textbuffer.
 */
void Textbuf::Print(const char *format, ...)
{
	va_list va;
	va_start(va, format);
	vseprintf(this->buf, &this->buf[this->max_bytes - 1], format, va);
	va_end(va);
	this->UpdateSize();
}


/**
 * Update Textbuf type with its actual physical character and screenlength
 * Get the count of characters in the string as well as the width in pixels.
 * Useful when copying in a larger amount of text at once
 */
void Textbuf::UpdateSize()
{
	const char *buf = this->buf;

	this->chars = this->bytes = 1; // terminating zero

	WChar c;
	while ((c = Utf8Consume(&buf)) != '\0') {
		this->bytes += Utf8CharLen(c);
		this->chars++;
	}
	assert(this->bytes <= this->max_bytes);
	assert(this->chars <= this->max_chars);

	this->caretpos = this->bytes - 1;
	this->UpdateStringIter();
	this->UpdateWidth();
	this->UpdateMarkedText();

	this->UpdateCaretPosition();
}

/**
 * Handle the flashing of the caret.
 * @return True if the caret state changes.
 */
bool Textbuf::HandleCaret()
{
	/* caret changed? */
	bool b = !!(_caret_timer & 0x20);

	if (b != this->caret) {
		this->caret = b;
		return true;
	}
	return false;
}

HandleKeyPressResult Textbuf::HandleKeyPress(WChar key, uint16 keycode)
{
	bool edited = false;

	switch (keycode) {
		case WKC_ESC: return HKPR_CANCEL;

		case WKC_RETURN: case WKC_NUM_ENTER: return HKPR_CONFIRM;

		case (WKC_CTRL | 'V'):
			edited = this->InsertClipboard();
			break;

		case (WKC_CTRL | 'U'):
			this->DeleteAll();
			edited = true;
			break;

		case WKC_BACKSPACE: case WKC_DELETE:
		case WKC_CTRL | WKC_BACKSPACE: case WKC_CTRL | WKC_DELETE:
			edited = this->DeleteChar(keycode);
			break;

		case WKC_LEFT: case WKC_RIGHT: case WKC_END: case WKC_HOME:
		case WKC_CTRL | WKC_LEFT: case WKC_CTRL | WKC_RIGHT:
			this->MovePos(keycode);
			break;

		default:
			if (IsValidChar(key, this->afilter)) {
				edited = this->InsertChar(key);
			} else {
				return HKPR_NOT_HANDLED;
			}
			break;
	}

	return edited ? HKPR_EDITING : HKPR_CURSOR;
}