aboutsummaryrefslogtreecommitdiff
path: root/engines/sci/graphics/controls32.cpp
blob: 0cd924b38d443a18bdba0c3f7fc727b7689f0713 (plain)
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
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
/* ScummVM - Graphic Adventure Engine
 *
 * ScummVM is the legal property of its developers, whose names
 * are too numerous to list here. Please refer to the COPYRIGHT
 * file distributed with this source distribution.
 *
 * This program 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; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program 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 this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 *
 */

#include "common/system.h"
#include "common/translation.h"
#include "gui/message.h"
#include "sci/sci.h"
#include "sci/console.h"
#include "sci/event.h"
#include "sci/engine/kernel.h"
#include "sci/engine/seg_manager.h"
#include "sci/engine/state.h"
#include "sci/graphics/cache.h"
#include "sci/graphics/compare.h"
#include "sci/graphics/controls32.h"
#include "sci/graphics/font.h"
#include "sci/graphics/screen.h"
#include "sci/graphics/text32.h"

namespace Sci {
GfxControls32::GfxControls32(SegManager *segMan, GfxCache *cache, GfxText32 *text) :
	_segMan(segMan),
	_gfxCache(cache),
	_gfxText32(text),
	_overwriteMode(false),
	_nextCursorFlashTick(0),
	// SSCI used a memory handle for a ScrollWindow object
	// as ID. We use a simple numeric handle instead.
	_nextScrollWindowId(10000) {}

GfxControls32::~GfxControls32() {
	ScrollWindowMap::iterator it;
	for (it = _scrollWindows.begin(); it != _scrollWindows.end(); ++it)
		delete it->_value;
}

#pragma mark -
#pragma mark Text input control

reg_t GfxControls32::kernelEditText(const reg_t controlObject) {
	SegManager *segMan = _segMan;

	TextEditor editor;
	reg_t textObject = readSelector(_segMan, controlObject, SELECTOR(text));
	editor.text = _segMan->getString(textObject);
	editor.foreColor = readSelectorValue(_segMan, controlObject, SELECTOR(fore));
	editor.backColor = readSelectorValue(_segMan, controlObject, SELECTOR(back));
	editor.skipColor = readSelectorValue(_segMan, controlObject, SELECTOR(skip));
	editor.fontId = readSelectorValue(_segMan, controlObject, SELECTOR(font));
	editor.maxLength = readSelectorValue(_segMan, controlObject, SELECTOR(width));
	editor.bitmap = readSelector(_segMan, controlObject, SELECTOR(bitmap));
	editor.cursorCharPosition = 0;
	editor.cursorIsDrawn = false;
	editor.borderColor = readSelectorValue(_segMan, controlObject, SELECTOR(borderColor));

	reg_t titleObject = readSelector(_segMan, controlObject, SELECTOR(title));

	int16 titleHeight = 0;
	GuiResourceId titleFontId = readSelectorValue(_segMan, controlObject, SELECTOR(titleFont));
	if (!titleObject.isNull()) {
		GfxFont *titleFont = _gfxCache->getFont(titleFontId);
		titleHeight += _gfxText32->scaleUpHeight(titleFont->getHeight()) + 1;
		if (editor.borderColor != -1) {
			titleHeight += 2;
		}
	}

	int16 width = 0;
	int16 height = titleHeight;

	GfxFont *editorFont = _gfxCache->getFont(editor.fontId);
	height += _gfxText32->scaleUpHeight(editorFont->getHeight()) + 1;
	_gfxText32->setFont(editor.fontId);
	int16 emSize = _gfxText32->getCharWidth('M', true);
	width += editor.maxLength * emSize + 1;
	if (editor.borderColor != -1) {
		width += 4;
		height += 2;
	}

	Common::Rect editorPlaneRect(width, height);
	editorPlaneRect.translate(readSelectorValue(_segMan, controlObject, SELECTOR(x)), readSelectorValue(_segMan, controlObject, SELECTOR(y)));

	reg_t planeObj = readSelector(_segMan, controlObject, SELECTOR(plane));
	Plane *sourcePlane = g_sci->_gfxFrameout->getVisiblePlanes().findByObject(planeObj);
	if (sourcePlane == nullptr) {
		sourcePlane = g_sci->_gfxFrameout->getPlanes().findByObject(planeObj);
		if (sourcePlane == nullptr) {
			error("Could not find plane %04x:%04x", PRINT_REG(planeObj));
		}
	}
	editorPlaneRect.translate(sourcePlane->_gameRect.left, sourcePlane->_gameRect.top);

	editor.textRect = Common::Rect(2, titleHeight + 2, width - 1, height - 1);
	editor.width = width;

	if (editor.bitmap.isNull()) {
		TextAlign alignment = (TextAlign)readSelectorValue(_segMan, controlObject, SELECTOR(mode));

		if (titleObject.isNull()) {
			bool dimmed = readSelectorValue(_segMan, controlObject, SELECTOR(dimmed));
			editor.bitmap = _gfxText32->createFontBitmap(width, height, editor.textRect, editor.text, editor.foreColor, editor.backColor, editor.skipColor, editor.fontId, alignment, editor.borderColor, dimmed, true, false);
		} else {
			error("Titled bitmaps are not known to be used by any game. Please submit a bug report with details about the game you were playing and what you were doing that triggered this error. Thanks!");
		}
	}

	drawCursor(editor);

	Plane *plane = new Plane(editorPlaneRect, kPlanePicTransparent);
	plane->changePic();
	g_sci->_gfxFrameout->addPlane(*plane);

	CelInfo32 celInfo;
	celInfo.type = kCelTypeMem;
	celInfo.bitmap = editor.bitmap;

	ScreenItem *screenItem = new ScreenItem(plane->_object, celInfo, Common::Point(), ScaleInfo());
	plane->_screenItemList.add(screenItem);

	// frameOut must be called after the screen item is
	// created, and before it is updated at the end of the
	// event loop, otherwise it has both created and updated
	// flags set which crashes the engine (it runs updates
	// before creations)
	g_sci->_gfxFrameout->frameOut(true);

	EventManager *eventManager = g_sci->getEventManager();
	bool clearTextOnInput = true;
	bool textChanged = false;
	for (;;) {
		// We peek here because the last event needs to be allowed to
		// dispatch a second time to the normal event handling system.
		// In the actual engine, the event is always consumed and then
		// the last event just gets posted back to the event manager for
		// reprocessing, but instead, we only remove the event from the
		// queue *after* we have determined it is not a defocusing event
		const SciEvent event = eventManager->getSciEvent(SCI_EVENT_ANY | SCI_EVENT_PEEK);

		bool focused = true;
		// Original engine did not have a QUIT event but we have to handle it
		if (event.type == SCI_EVENT_QUIT) {
			focused = false;
		} else if (event.type == SCI_EVENT_MOUSE_PRESS && !editorPlaneRect.contains(event.mousePosSci)) {
			focused = false;
		} else if (event.type == SCI_EVENT_KEYBOARD) {
			switch (event.character) {
			case SCI_KEY_ESC:
			case SCI_KEY_UP:
			case SCI_KEY_DOWN:
			case SCI_KEY_TAB:
			case SCI_KEY_SHIFT_TAB:
			case SCI_KEY_ENTER:
				focused = false;
				break;
			}
		}

		if (!focused) {
			break;
		}

		// Consume the event now that we know it is not one of the
		// defocusing events above
		if (event.type != SCI_EVENT_NONE)
			eventManager->getSciEvent(SCI_EVENT_ANY);

		// NOTE: In the original engine, the font and bitmap were
		// reset here on each iteration through the loop, but it
		// doesn't seem like this should be necessary since
		// control is not yielded back to the VM until input is
		// received, which means there is nothing that could modify
		// the GfxText32's state with a different font in the
		// meantime

		bool shouldDeleteChar = false;
		bool shouldRedrawText = false;
		uint16 lastCursorPosition = editor.cursorCharPosition;
 		if (event.type == SCI_EVENT_KEYBOARD) {
			switch (event.character) {
			case SCI_KEY_LEFT:
				clearTextOnInput = false;
				if (editor.cursorCharPosition > 0) {
					--editor.cursorCharPosition;
				}
				break;

			case SCI_KEY_RIGHT:
				clearTextOnInput = false;
				if (editor.cursorCharPosition < editor.text.size()) {
					++editor.cursorCharPosition;
				}
				break;

			case SCI_KEY_HOME:
				clearTextOnInput = false;
				editor.cursorCharPosition = 0;
				break;

			case SCI_KEY_END:
				clearTextOnInput = false;
				editor.cursorCharPosition = editor.text.size();
				break;

			case SCI_KEY_INSERT:
				clearTextOnInput = false;
				// Redrawing also changes the cursor rect to
				// reflect the new insertion mode
				shouldRedrawText = true;
				_overwriteMode = !_overwriteMode;
				break;

			case SCI_KEY_DELETE:
				clearTextOnInput = false;
				if (editor.cursorCharPosition < editor.text.size()) {
					shouldDeleteChar = true;
				}
				break;

			case SCI_KEY_BACKSPACE:
				clearTextOnInput = false;
				shouldDeleteChar = true;
				if (editor.cursorCharPosition > 0) {
					--editor.cursorCharPosition;
				}
				break;

			case SCI_KEY_ETX:
				editor.text.clear();
				editor.cursorCharPosition = 0;
				shouldRedrawText = true;
				break;

			default: {
				if (event.character >= 20 && event.character < 257) {
					if (clearTextOnInput) {
						clearTextOnInput = false;
						editor.text.clear();
					}

					if (
						(_overwriteMode && editor.cursorCharPosition < editor.maxLength) ||
						(editor.text.size() < editor.maxLength && _gfxText32->getCharWidth(event.character, true) + _gfxText32->getStringWidth(editor.text) < editor.textRect.width())
					) {
						if (_overwriteMode && editor.cursorCharPosition < editor.text.size()) {
							editor.text.setChar(event.character, editor.cursorCharPosition);
						} else {
							editor.text.insertChar(event.character, editor.cursorCharPosition);
						}

						++editor.cursorCharPosition;
						shouldRedrawText = true;
					}
				}
			}
			}
		}

		if (shouldDeleteChar) {
			shouldRedrawText = true;
			if (editor.cursorCharPosition < editor.text.size()) {
				editor.text.deleteChar(editor.cursorCharPosition);
			}
		}

		if (shouldRedrawText) {
			eraseCursor(editor);
			_gfxText32->erase(editor.textRect, true);
			_gfxText32->drawTextBox(editor.text);
			drawCursor(editor);
			textChanged = true;
			screenItem->_updated = g_sci->_gfxFrameout->getScreenCount();
		} else if (editor.cursorCharPosition != lastCursorPosition) {
			eraseCursor(editor);
			drawCursor(editor);
			screenItem->_updated = g_sci->_gfxFrameout->getScreenCount();
		} else {
			flashCursor(editor);
			screenItem->_updated = g_sci->_gfxFrameout->getScreenCount();
		}

		g_sci->_gfxFrameout->frameOut(true);
		g_sci->getSciDebugger()->onFrame();
		g_sci->_gfxFrameout->throttle();
	}

	g_sci->_gfxFrameout->deletePlane(*plane);
	if (readSelectorValue(segMan, controlObject, SELECTOR(frameOut))) {
		g_sci->_gfxFrameout->frameOut(true);
	}

	_segMan->freeBitmap(editor.bitmap);

	if (textChanged) {
		editor.text.trim();
		SciArray &string = *_segMan->lookupArray(textObject);
		string.fromString(editor.text);
	}

	return make_reg(0, textChanged);
}

void GfxControls32::drawCursor(TextEditor &editor) {
	if (!editor.cursorIsDrawn) {
		editor.cursorRect.left = editor.textRect.left + _gfxText32->getTextWidth(editor.text, 0, editor.cursorCharPosition);

		const int16 scaledFontHeight = _gfxText32->scaleUpHeight(_gfxText32->_font->getHeight());

		// NOTE: The original code branched on borderColor here but
		// the two branches appeared to be identical, differing only
		// because the compiler decided to be differently clever
		// when optimising multiplication in each branch
		if (_overwriteMode) {
			editor.cursorRect.top = editor.textRect.top;
			editor.cursorRect.setHeight(scaledFontHeight);
		} else {
			editor.cursorRect.top = editor.textRect.top + scaledFontHeight - 1;
			editor.cursorRect.setHeight(1);
		}

		const char currentChar = editor.cursorCharPosition < editor.text.size() ? editor.text[editor.cursorCharPosition] : ' ';
		editor.cursorRect.setWidth(_gfxText32->getCharWidth(currentChar, true));

		_gfxText32->invertRect(editor.bitmap, editor.width, editor.cursorRect, editor.foreColor, editor.backColor, true);

		editor.cursorIsDrawn = true;
	}

	_nextCursorFlashTick = g_sci->getTickCount() + 30;
}

void GfxControls32::eraseCursor(TextEditor &editor) {
	if (editor.cursorIsDrawn) {
		_gfxText32->invertRect(editor.bitmap, editor.width, editor.cursorRect, editor.foreColor, editor.backColor, true);
		editor.cursorIsDrawn = false;
	}

	_nextCursorFlashTick = g_sci->getTickCount() + 30;
}

void GfxControls32::flashCursor(TextEditor &editor) {
	if (g_sci->getTickCount() > _nextCursorFlashTick) {
		_gfxText32->invertRect(editor.bitmap, editor.width, editor.cursorRect, editor.foreColor, editor.backColor, true);

		editor.cursorIsDrawn = !editor.cursorIsDrawn;
		_nextCursorFlashTick = g_sci->getTickCount() + 30;
	}
}

#pragma mark -
#pragma mark Scrollable window control

ScrollWindow::ScrollWindow(SegManager *segMan, const Common::Rect &gameRect, const Common::Point &position, const reg_t plane, const uint8 defaultForeColor, const uint8 defaultBackColor, const GuiResourceId defaultFontId, const TextAlign defaultAlignment, const int16 defaultBorderColor, const uint16 maxNumEntries) :
	_segMan(segMan),
	_gfxText32(segMan, g_sci->_gfxCache),
	_maxNumEntries(maxNumEntries),
	_firstVisibleChar(0),
	_topVisibleLine(0),
	_lastVisibleChar(0),
	_bottomVisibleLine(0),
	_numLines(0),
	_numVisibleLines(0),
	_plane(plane),
	_foreColor(defaultForeColor),
	_backColor(defaultBackColor),
	_borderColor(defaultBorderColor),
	_fontId(defaultFontId),
	_alignment(defaultAlignment),
	_visible(false),
	_position(position),
	_screenItem(nullptr),
	_nextEntryId(1) {

	_entries.reserve(maxNumEntries);

	_gfxText32.setFont(_fontId);
	_pointSize = _gfxText32._font->getHeight();

	const uint16 scriptWidth = g_sci->_gfxFrameout->getCurrentBuffer().scriptWidth;
	const uint16 scriptHeight = g_sci->_gfxFrameout->getCurrentBuffer().scriptHeight;

	Common::Rect bitmapRect(gameRect);
	mulinc(bitmapRect, Ratio(_gfxText32._xResolution, scriptWidth), Ratio(_gfxText32._yResolution, scriptHeight));

	_textRect.left = 2;
	_textRect.top = 2;
	_textRect.right = bitmapRect.width() - 2;
	_textRect.bottom = bitmapRect.height() - 2;

	uint8 skipColor = 0;
	while (skipColor == _foreColor || skipColor == _backColor) {
		skipColor++;
	}

	assert(bitmapRect.width() > 0 && bitmapRect.height() > 0);
	_bitmap = _gfxText32.createFontBitmap(bitmapRect.width(), bitmapRect.height(), _textRect, "", _foreColor, _backColor, skipColor, _fontId, _alignment, _borderColor, false, false, false);

	debugC(1, kDebugLevelGraphics, "New ScrollWindow: textRect size: %d x %d, bitmap: %04x:%04x", _textRect.width(), _textRect.height(), PRINT_REG(_bitmap));
}

ScrollWindow::~ScrollWindow() {
	_segMan->freeBitmap(_bitmap);
	// _screenItem will be deleted by GfxFrameout
}

Ratio ScrollWindow::where() const {
	return Ratio(_topVisibleLine, MAX(_numLines, 1));
}

void ScrollWindow::show() {
	if (_visible) {
		return;
	}

	if (_screenItem == nullptr) {
		CelInfo32 celInfo;
		celInfo.type = kCelTypeMem;
		celInfo.bitmap = _bitmap;

		_screenItem = new ScreenItem(_plane, celInfo, _position, ScaleInfo());
	}

	Plane *plane = g_sci->_gfxFrameout->getPlanes().findByObject(_plane);

	if (plane == nullptr) {
		error("[ScrollWindow::show]: Plane %04x:%04x not found", PRINT_REG(_plane));
	}

	plane->_screenItemList.add(_screenItem);

	_visible = true;
}

void ScrollWindow::hide() {
	if (!_visible) {
		return;
	}

	g_sci->_gfxFrameout->deleteScreenItem(*_screenItem, _plane);
	_screenItem = nullptr;
	g_sci->_gfxFrameout->frameOut(true);

	_visible = false;
}

reg_t ScrollWindow::add(const Common::String &text, const GuiResourceId fontId, const int16 foreColor, const TextAlign alignment, const bool scrollTo) {
	if (_entries.size() == _maxNumEntries) {
		ScrollWindowEntry removedEntry = _entries.remove_at(0);
		_text.erase(0, removedEntry.text.size());
		// `_firstVisibleChar` will be reset shortly if
		// `scrollTo` is true, so there is no reason to
		// update it
		if (!scrollTo) {
			_firstVisibleChar -= removedEntry.text.size();
		}
	}

	_entries.push_back(ScrollWindowEntry());
	ScrollWindowEntry &entry = _entries.back();

	// NOTE: In SSCI the line ID was a memory handle for the
	// string of this line. We use a numeric ID instead.
	entry.id = make_reg(0, _nextEntryId++);

	if (_nextEntryId > _maxNumEntries) {
		_nextEntryId = 1;
	}

	// NOTE: In SSCI this was updated after _text was
	// updated, which meant there was an extra unnecessary
	// subtraction operation (subtracting `entry.text` size)
	if (scrollTo) {
		_firstVisibleChar = _text.size();
	}

	fillEntry(entry, text, fontId, foreColor, alignment);
	_text += entry.text;

	computeLineIndices();
	update(true);

	return entry.id;
}

void ScrollWindow::fillEntry(ScrollWindowEntry &entry, const Common::String &text, const GuiResourceId fontId, const int16 foreColor, const TextAlign alignment) {
	entry.alignment = alignment;
	entry.foreColor = foreColor;
	entry.fontId = fontId;

	Common::String formattedText;

	// NB: There are inconsistencies here.
	// If there is a multi-line entry with non-default properties, and it
	// is only partially displayed, it may not be displayed right, since the
	// property directives are only added to the first line.
	// (Verified by trying this in SSCI SQ6 with a custom ScrollWindowAdd call.)
	//
	// The converse is also a potential issue (but unverified), where lines
	// with properties -1 can inherit properties from the previously rendered
	// line instead of the defaults.

	// NOTE: SSCI added "|s<lineIndex>|" here, but |s| is
	// not a valid control code, so it just always ended up
	// getting skipped
	if (entry.fontId != -1) {
		formattedText += Common::String::format("|f%d|", entry.fontId);
	}
	if (entry.foreColor != -1) {
		formattedText += Common::String::format("|c%d|", entry.foreColor);
	}
	if (entry.alignment != -1) {
		formattedText += Common::String::format("|a%d|", entry.alignment);
	}
	formattedText += text;
	entry.text = formattedText;
}

reg_t ScrollWindow::modify(const reg_t id, const Common::String &text, const GuiResourceId fontId, const int16 foreColor, const TextAlign alignment, const bool scrollTo) {

	EntriesList::iterator it = _entries.begin();
	uint firstCharLocation = 0;
	for ( ; it != _entries.end(); ++it) {
		if (it->id == id) {
			break;
		}
		firstCharLocation += it->text.size();
	}

	if (it == _entries.end()) {
		return make_reg(0, 0);
	}

	ScrollWindowEntry &entry = *it;

	uint oldTextLength = entry.text.size();

	fillEntry(entry, text, fontId, foreColor, alignment);
	_text.replace(firstCharLocation, oldTextLength, entry.text);

	if (scrollTo) {
		_firstVisibleChar = firstCharLocation;
	}

	computeLineIndices();
	update(true);

	return entry.id;
}

void ScrollWindow::upArrow() {
	if (_topVisibleLine == 0) {
		return;
	}

	_topVisibleLine--;
	_bottomVisibleLine--;

	if (_bottomVisibleLine - _topVisibleLine + 1 < _numVisibleLines) {
		_bottomVisibleLine = _numLines - 1;
	}

	_firstVisibleChar = _startsOfLines[_topVisibleLine];
	_lastVisibleChar = _startsOfLines[_bottomVisibleLine + 1] - 1;

	_visibleText = Common::String(_text.c_str() + _firstVisibleChar, _text.c_str() + _lastVisibleChar + 1);

	Common::String lineText(_text.c_str() + _startsOfLines[_topVisibleLine], _text.c_str() + _startsOfLines[_topVisibleLine + 1] - 1);

	debugC(3, kDebugLevelGraphics, "ScrollWindow::upArrow: top: %d, bottom: %d, num: %d, numvis: %d, lineText: %s", _topVisibleLine, _bottomVisibleLine, _numLines, _numVisibleLines, lineText.c_str());

	_gfxText32.scrollLine(lineText, _numVisibleLines, _foreColor, _alignment, _fontId, kScrollUp);

	if (_visible) {
		assert(_screenItem);

		_screenItem->update();
		g_sci->_gfxFrameout->frameOut(true);
	}
}

void ScrollWindow::downArrow() {
	if (_topVisibleLine + 1 >= _numLines) {
		return;
	}

	_topVisibleLine++;
	_bottomVisibleLine++;

	if (_bottomVisibleLine + 1 >= _numLines) {
		_bottomVisibleLine = _numLines - 1;
	}

	_firstVisibleChar = _startsOfLines[_topVisibleLine];
	_lastVisibleChar = _startsOfLines[_bottomVisibleLine + 1] - 1;

	_visibleText = Common::String(_text.c_str() + _firstVisibleChar, _text.c_str() + _lastVisibleChar + 1);

	Common::String lineText;
	if (_bottomVisibleLine - _topVisibleLine + 1 == _numVisibleLines) {
		lineText = Common::String(_text.c_str() + _startsOfLines[_bottomVisibleLine], _text.c_str() + _startsOfLines[_bottomVisibleLine + 1] - 1);
	} else {
		// scroll in empty string
	}

	debugC(3, kDebugLevelGraphics, "ScrollWindow::downArrow: top: %d, bottom: %d, num: %d, numvis: %d, lineText: %s", _topVisibleLine, _bottomVisibleLine, _numLines, _numVisibleLines, lineText.c_str());


	_gfxText32.scrollLine(lineText, _numVisibleLines, _foreColor, _alignment, _fontId, kScrollDown);

	if (_visible) {
		assert(_screenItem);

		_screenItem->update();
		g_sci->_gfxFrameout->frameOut(true);
	}
}

void ScrollWindow::go(const Ratio location) {
	const int line = (location * _numLines).toInt();
	if (line < 0 || line > _numLines) {
		error("Index is Out of Range in ScrollWindow");
	}

	_firstVisibleChar = _startsOfLines[line];
	update(true);

	// HACK:
	// It usually isn't possible to set _topVisibleLine >= _numLines, and so
	// update() doesn't. However, in this case we should set _topVisibleLine
	// past the end. This is clearly visible in Phantasmagoria when dragging
	// the slider in the About dialog to the very end. The slider ends up lower
	// than where it can be moved by scrolling down with the arrows.
	if (location.isOne()) {
		_topVisibleLine = _numLines;
	}
}

void ScrollWindow::home() {
	if (_firstVisibleChar == 0) {
		return;
	}

	_firstVisibleChar = 0;
	update(true);
}

void ScrollWindow::end() {
	if (_bottomVisibleLine + 1 >= _numLines) {
		return;
	}

	int line = _numLines - _numVisibleLines;
	if (line < 0) {
		line = 0;
	}
	_firstVisibleChar = _startsOfLines[line];
	update(true);
}

void ScrollWindow::pageUp() {
	if (_topVisibleLine == 0) {
		return;
	}

	_topVisibleLine -= _numVisibleLines;
	if (_topVisibleLine < 0) {
		_topVisibleLine = 0;
	}

	_firstVisibleChar = _startsOfLines[_topVisibleLine];
	update(true);
}

void ScrollWindow::pageDown() {
	if (_topVisibleLine + 1 >= _numLines) {
		return;
	}

	_topVisibleLine += _numVisibleLines;
	if (_topVisibleLine + 1 >= _numLines) {
		_topVisibleLine = _numLines - 1;
	}

	_firstVisibleChar = _startsOfLines[_topVisibleLine];
	update(true);
}

void ScrollWindow::computeLineIndices() {
	_gfxText32.setFont(_fontId);
	// NOTE: Unlike SSCI, foreColor and alignment are not
	// set since these properties do not affect the width of
	// lines

	if (_gfxText32._font->getHeight() != _pointSize) {
		error("Illegal font size font = %d pointSize = %d, should be %d.", _fontId, _gfxText32._font->getHeight(), _pointSize);
	}

	Common::Rect lineRect(0, 0, _textRect.width(), _pointSize + 3);

	_startsOfLines.clear();

	// NOTE: The original engine had a 1000-line limit; we
	// do not enforce any limit
	for (uint charIndex = 0; charIndex < _text.size(); ) {
		_startsOfLines.push_back(charIndex);
		charIndex += _gfxText32.getTextCount(_text, charIndex, lineRect, false);
	}

	_numLines = _startsOfLines.size();

	_startsOfLines.push_back(_text.size());

	_lastVisibleChar = _gfxText32.getTextCount(_text, 0, _fontId, _textRect, false) - 1;

	_bottomVisibleLine = 0;
	while (
		_bottomVisibleLine < _numLines - 1 &&
		_startsOfLines[_bottomVisibleLine + 1] < _lastVisibleChar
	) {
		++_bottomVisibleLine;
	}

	_numVisibleLines = _bottomVisibleLine + 1;
}

void ScrollWindow::update(const bool doFrameOut) {
	_topVisibleLine = 0;
	while (
		_topVisibleLine < _numLines - 1 &&
		_firstVisibleChar >= _startsOfLines[_topVisibleLine + 1]
	) {
		++_topVisibleLine;
	}

	_bottomVisibleLine = _topVisibleLine + _numVisibleLines - 1;
	if (_bottomVisibleLine >= _numLines) {
		_bottomVisibleLine = _numLines - 1;
	}

	_firstVisibleChar = _startsOfLines[_topVisibleLine];

	if (_bottomVisibleLine >= 0) {
		_lastVisibleChar = _startsOfLines[_bottomVisibleLine + 1] - 1;
	} else {
		_lastVisibleChar = -1;
	}

	_visibleText = Common::String(_text.c_str() + _firstVisibleChar, _text.c_str() + _lastVisibleChar + 1);

	_gfxText32.erase(_textRect, false);
	_gfxText32.drawTextBox(_visibleText);

	if (_visible) {
		assert(_screenItem);

		_screenItem->update();
		if (doFrameOut) {
			g_sci->_gfxFrameout->frameOut(true);
		}
	}
}

reg_t GfxControls32::makeScrollWindow(const Common::Rect &gameRect, const Common::Point &position, const reg_t planeObj, const uint8 defaultForeColor, const uint8 defaultBackColor, const GuiResourceId defaultFontId, const TextAlign defaultAlignment, const int16 defaultBorderColor, const uint16 maxNumEntries) {

	ScrollWindow *scrollWindow = new ScrollWindow(_segMan, gameRect, position, planeObj, defaultForeColor, defaultBackColor, defaultFontId, defaultAlignment, defaultBorderColor, maxNumEntries);

	const uint16 id = _nextScrollWindowId++;
	_scrollWindows[id] = scrollWindow;
	return make_reg(0, id);
}

ScrollWindow *GfxControls32::getScrollWindow(const reg_t id) {
	ScrollWindowMap::iterator it;
	it = _scrollWindows.find(id.toUint16());
	if (it == _scrollWindows.end())
		error("Invalid ScrollWindow ID");

	return it->_value;
}

void GfxControls32::destroyScrollWindow(const reg_t id) {
	ScrollWindow *scrollWindow = getScrollWindow(id);
	scrollWindow->hide();
	_scrollWindows.erase(id.getOffset());
	delete scrollWindow;
}

#pragma mark -
#pragma mark Message box

int16 GfxControls32::showMessageBox(const Common::String &message, const char *const okLabel, const char *const altLabel, const int16 okValue, const int16 altValue) {
	GUI::MessageDialog dialog(message, okLabel, altLabel);
	return (dialog.runModal() == GUI::kMessageOK) ? okValue : altValue;
}

reg_t GfxControls32::kernelMessageBox(const Common::String &message, const Common::String &title, const uint16 style) {
	if (g_engine) {
		g_engine->pauseEngine(true);
	}

	int16 result;

	switch (style & 0xF) {
	case kMessageBoxOK:
		result = showMessageBox(message, _("OK"), NULL, 1, 1);
	break;
	case kMessageBoxYesNo:
		result = showMessageBox(message, _("Yes"), _("No"), 6, 7);
	break;
	default:
		error("Unsupported MessageBox style 0x%x", style & 0xF);
	}

	if (g_engine) {
		g_engine->pauseEngine(false);
	}

	return make_reg(0, result);
}

} // End of namespace Sci