summaryrefslogtreecommitdiff
path: root/src/story_gui.cpp
blob: 5c9b0c9eda78f4d370d961f87e7d958dc80b33e9 (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
/* $Id$ */

/*
 * 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 goal_gui.cpp GUI for goals. */

#include "stdafx.h"
#include "window_gui.h"
#include "strings_func.h"
#include "date_func.h"
#include "gui.h"
#include "story_base.h"
#include "core/geometry_func.hpp"
#include "company_func.h"
#include "command_func.h"
#include "widgets/dropdown_type.h"
#include "widgets/dropdown_func.h"
#include "sortlist_type.h"
#include "goal_base.h"
#include "viewport_func.h"
#include "window_func.h"
#include "company_base.h"

#include "widgets/story_widget.h"

#include "table/strings.h"
#include "table/sprites.h"

typedef GUIList<const StoryPage*> GUIStoryPageList;
typedef GUIList<const StoryPageElement*> GUIStoryPageElementList;

struct StoryBookWindow : Window {
protected:
	Scrollbar *vscroll;                ///< Scrollbar of the page text.

	GUIStoryPageList story_pages;      ///< Sorted list of pages.
	GUIStoryPageElementList story_page_elements; ///< Sorted list of page elements that belong to the current page.
	StoryPageID selected_page_id;      ///< Pool index of selected page.
	char selected_generic_title[255];  ///< If the selected page doesn't have a custom title, this buffer is used to store a generic page title.

	static GUIStoryPageList::SortFunction * const page_sorter_funcs[];
	static GUIStoryPageElementList::SortFunction * const page_element_sorter_funcs[];

	/** (Re)Build story page list. */
	void BuildStoryPageList()
	{
		if (this->story_pages.NeedRebuild()) {
			this->story_pages.Clear();

			const StoryPage *p;
			FOR_ALL_STORY_PAGES(p) {
				if (this->IsPageAvailable(p)) {
					*this->story_pages.Append() = p;
				}
			}

			this->story_pages.Compact();
			this->story_pages.RebuildDone();
		}

		this->story_pages.Sort();
	}

	/** Sort story pages by order value. */
	static int CDECL PageOrderSorter(const StoryPage * const *a, const StoryPage * const *b)
	{
		return (*a)->sort_value - (*b)->sort_value;
	}

	/** (Re)Build story page element list. */
	void BuildStoryPageElementList()
	{
		if (this->story_page_elements.NeedRebuild()) {
			this->story_page_elements.Clear();

			const StoryPage *p = GetSelPage();
			if (p != NULL) {
				const StoryPageElement *pe;
				FOR_ALL_STORY_PAGE_ELEMENTS(pe) {
					if (pe->page == p->index) {
						*this->story_page_elements.Append() = pe;
					}
				}
			}

			this->story_page_elements.Compact();
			this->story_page_elements.RebuildDone();
		}

		this->story_page_elements.Sort();
	}

	/** Sort story page elements by order value. */
	static int CDECL PageElementOrderSorter(const StoryPageElement * const *a, const StoryPageElement * const *b)
	{
		return (*a)->sort_value - (*b)->sort_value;
	}

	/*
	 * Checks if a given page should be visible in the story book.
	 * @param page The page to check.
	 * @return True if the page should be visible, otherwise false.
	 */
	bool IsPageAvailable(const StoryPage *page) const
	{
		return page->company == INVALID_COMPANY || page->company == this->window_number;
	}

	/**
	 * Get instance of selected page.
	 * @return Instance of selected page or NULL if no page is selected.
	 */
	StoryPage *GetSelPage() const
	{
		if (!_story_page_pool.IsValidID(selected_page_id)) return NULL;
		return _story_page_pool.Get(selected_page_id);
	}

	/**
	 * Get the page number of selected page.
	 * @return Number of available pages before to the selected one, or -1 if no page is selected.
	 */
	int GetSelPageNum() const
	{
		int page_number = 0;
		for (const StoryPage *const*iter = this->story_pages.Begin(); iter != this->story_pages.End(); iter++) {
			const StoryPage *p = *iter;
			if (p->index == this->selected_page_id) {
				return page_number;
			}
			page_number++;
		}
		return -1;
	}

	/**
	 * Check if the selected page is also the first available page.
	 */
	bool IsFirstPageSelected()
	{
		/* Verify that the selected page exist. */
		if (!_story_page_pool.IsValidID(this->selected_page_id)) return false;

		return (*this->story_pages.Begin())->index == this->selected_page_id;
	}

	/**
	 * Check if the selected page is also the last available page.
	 */
	bool IsLastPageSelected()
	{
		/* Verify that the selected page exist. */
		if (!_story_page_pool.IsValidID(this->selected_page_id)) return false;

		if (this->story_pages.Length() <= 1) return true;
		const StoryPage *last = *(this->story_pages.End() - 1);
		return last->index == this->selected_page_id;
	}

	/**
	 * Updates the content of selected page.
	 */
	void RefreshSelectedPage()
	{
		/* Generate generic title if selected page have no custom title. */
		StoryPage *page = this->GetSelPage();
		if (page != NULL && page->title == NULL) {
			SetDParam(0, GetSelPageNum() + 1);
			GetString(selected_generic_title, STR_STORY_BOOK_GENERIC_PAGE_ITEM, lastof(selected_generic_title));
		}

		this->story_page_elements.ForceRebuild();
		this->BuildStoryPageElementList();

		this->vscroll->SetCount(this->CountLines());
		this->SetWidgetDirty(WID_SB_SCROLLBAR);
		this->SetWidgetDirty(WID_SB_SEL_PAGE);
		this->SetWidgetDirty(WID_SB_PAGE_PANEL);
	}

	/**
	 * Selects the previous available page before the currently selected page.
	 */
	void SelectPrevPage()
	{
		if (!_story_page_pool.IsValidID(this->selected_page_id)) return;

		/* Find the last available page which is previous to the current selected page. */
		const StoryPage *last_available;
		last_available = NULL;
		for (const StoryPage *const*iter = this->story_pages.Begin(); iter != this->story_pages.End(); iter++) {
			const StoryPage *p = *iter;
			if (p->index == this->selected_page_id) {
				if (last_available == NULL) return; // No previous page available.
				this->SetSelectedPage(last_available->index);
				return;
			}
			last_available = p;
		}
	}

	/**
	 * Selects the next available page after the currently selected page.
	 */
	void SelectNextPage()
	{
		if (!_story_page_pool.IsValidID(this->selected_page_id)) return;

		/* Find selected page. */
		for (const StoryPage *const*iter = this->story_pages.Begin(); iter != this->story_pages.End(); iter++) {
			const StoryPage *p = *iter;
			if (p->index == this->selected_page_id) {
				/* Select the page after selected page. */
				iter++;
				if (iter != this->story_pages.End()) {
					this->SetSelectedPage((*iter)->index);
				}
				return;
			}
		}
	}

	/**
	 * Builds the page selector drop down list.
	 */
	DropDownList *BuildDropDownList() const
	{
		DropDownList *list = new DropDownList();
		uint16 page_num = 1;
		for (const StoryPage *const*iter = this->story_pages.Begin(); iter != this->story_pages.End(); iter++) {
			const StoryPage *p = *iter;
			char *title = p->title;
			bool current_page = p->index == this->selected_page_id;
			DropDownListStringItem *item = NULL;
			if (p->title != NULL) {
				item = new DropDownListCharStringItem(p->title, p->index, current_page);
			} else {
				/* No custom title => use a generic page title with page number. */
				DropDownListParamStringItem *str_item =
						new DropDownListParamStringItem(STR_STORY_BOOK_GENERIC_PAGE_ITEM, p->index, current_page);
				str_item->SetParam(0, page_num);
				item = str_item;
			}

			list->push_back(item);
			page_num++;
		}

		/* Check if list is empty. */
		if (list->size() == 0) {
			free(list);
			list = NULL;
		}

		return list;
	}

	/**
	 * Get the width available for displaying content on the page panel.
	 */
	uint GetAvailablePageContentWidth()
	{
		return this->GetWidget<NWidgetCore>(WID_SB_PAGE_PANEL)->current_x - WD_FRAMETEXT_LEFT - WD_FRAMERECT_RIGHT;
	}

	/**
	 * Counts how many lines that are used by Date and Title
	 * (excluding marginal after Title, as each body element has
	 * an empty row before the elment).
	 * @param max_width Available width to display content.
	 * @return the number of lines.
	 */
	uint CountHeadLines(int max_width)
	{
		StoryPage *page = this->GetSelPage();
		if (page == NULL) return 0;
		int num_lines = 0;

		/* Title lines */
		num_lines += 1; // Date always use exactly one line.
		SetDParamStr(0, page->title != NULL ? page->title : this->selected_generic_title);
		num_lines += GetStringLineCount(STR_STORY_BOOK_TITLE, max_width);

		return num_lines;
	}

	/**
	 * Decides which sprite to display for a given page element.
	 * @param pe The page element.
	 * @return The SpriteID of the sprite to display.
	 * @pre pe.type must be SPET_GOAL or SPET_LOCATION.
	 */
	SpriteID GetPageElementSprite(const StoryPageElement &pe) const
	{
		switch (pe.type) {
			case SPET_GOAL: {
				Goal *g = Goal::Get((GoalID) pe.referenced_id);
				if (g == NULL) return SPR_IMG_GOAL_BROKEN_REF;
				return g->completed ? SPR_IMG_GOAL_COMPLETED : SPR_IMG_GOAL;
			}
			case SPET_LOCATION:
				return SPR_IMG_VIEW_LOCATION;
			default:
				NOT_REACHED();
		}
	}

	/**
	 * Count the number of lines used by a given page element.
	 * @param pe The story page element.
	 * @param max_width Available width to display content.
	 * @return the number of lines.
	 */
	uint CountPageElementLines(const StoryPageElement &pe, int max_width)
	{
		switch (pe.type) {
			case SPET_TEXT:
				SetDParamStr(0, pe.text);
				return GetStringLineCount(STR_BLACK_RAW_STRING, max_width);
				break;

			case SPET_GOAL:
			case SPET_LOCATION: {
				Dimension sprite_dim = GetSpriteSize(GetPageElementSprite(pe));
				int line_height = GetStringHeight(STR_JUST_NOTHING, INT_MAX);
				if (line_height == 0) return 1;
				return max((uint)1, sprite_dim.height / (uint)line_height);
				break;
			}
			default:
				NOT_REACHED();
		}
	}

	/**
	 * Count the number of lines in this window.
	 * @return the number of lines.
	 */
	uint CountLines()
	{
		StoryPage *page = this->GetSelPage();
		if (page == NULL) return 0;
		int max_width = GetAvailablePageContentWidth();

		/* Head lines */
		int num_lines = CountHeadLines(max_width);

		/* Body lines */
		for (const StoryPageElement **iter = this->story_page_elements.Begin(); iter != this->story_page_elements.End(); iter++) {
			const StoryPageElement *pe = *iter;
			num_lines += 1; // For the space between previous element and current element.

			num_lines += CountPageElementLines(*pe, max_width);
		}

		return num_lines;
	}

	/**
	 * Draws a page element that is composed of a sprite to the left and a single line of
	 * text after that. These page elements are generally clickable and are thus called
	 * action elements.
	 * @param y_offset Current y_offset which will get updated when this method has completed its drawing.
	 * @param width Width of the region available for drawing.
	 * @param line_height Height of one line of text.
	 * @param action_sprite The sprite to draw.
	 * @return the number of lines.
	 */
	void DrawActionElement(int &y_offset, int width, int line_height, SpriteID action_sprite) const
	{
		Dimension sprite_dim = GetSpriteSize(action_sprite);
		uint element_height = max((uint)1, sprite_dim.height / (uint)line_height) * line_height;

		uint sprite_top = y_offset + (element_height - sprite_dim.height) / 2;
		uint text_top = y_offset + (element_height - line_height) / 2;

		DrawSprite(action_sprite, PAL_NONE, 0, y_offset);
		DrawString(sprite_dim.width + WD_FRAMETEXT_LEFT, width, text_top, STR_JUST_RAW_STRING, TC_BLACK);

		y_offset += element_height;
	}

	/**
	 * Internal event handler for when a page element is clicked.
	 * @param pe The clicked page element.
	 */
	void OnPageElementClick(const StoryPageElement& pe)
	{
		switch (pe.type) {
			case SPET_TEXT:
				/* Do nothing. */
				break;

			case SPET_LOCATION:
				if (_ctrl_pressed) {
					ShowExtraViewPortWindow((TileIndex)pe.referenced_id);
				} else {
					ScrollMainWindowToTile((TileIndex)pe.referenced_id);
				}
				break;

			case SPET_GOAL:
				ShowGoalsList();
				break;

			default:
				NOT_REACHED();
		}
	}

public:
	StoryBookWindow(WindowDesc *desc, WindowNumber window_number) : Window(desc)
	{
		this->CreateNestedTree();
		this->vscroll = this->GetScrollbar(WID_SB_SCROLLBAR);

		/* Initalize page sort. */
		this->story_pages.SetSortFuncs(StoryBookWindow::page_sorter_funcs);
		this->story_pages.ForceRebuild();
		this->BuildStoryPageList();
		this->story_page_elements.SetSortFuncs(StoryBookWindow::page_element_sorter_funcs);
		/* story_page_elements will get built by SetSelectedPage */

		this->FinishInitNested(window_number);

		/* Initialize selected vars. */
		this->selected_generic_title[0] = '\0';
		this->selected_page_id = INVALID_STORY_PAGE;

		this->OnInvalidateData(-1);
	}

	/**
	 * Updates the disabled state of the prev/next buttons.
	 */
	void UpdatePrevNextDisabledState()
	{
		this->SetWidgetDisabledState(WID_SB_PREV_PAGE, story_pages.Length() == 0 || this->IsFirstPageSelected());
		this->SetWidgetDisabledState(WID_SB_NEXT_PAGE, story_pages.Length() == 0 || this->IsLastPageSelected());
		this->SetWidgetDirty(WID_SB_PREV_PAGE);
		this->SetWidgetDirty(WID_SB_NEXT_PAGE);
	}

	/**
	 * Sets the selected page.
	 * @param page_index pool index of the page to select.
	 */
	void SetSelectedPage(uint16 page_index)
	{
		if (this->selected_page_id != page_index) {
			this->selected_page_id = page_index;
			this->RefreshSelectedPage();
			this->UpdatePrevNextDisabledState();
		}
	}

	virtual void SetStringParameters(int widget) const
	{
		switch (widget) {
			case WID_SB_SEL_PAGE: {
				StoryPage *page = this->GetSelPage();
				SetDParamStr(0, page != NULL && page->title != NULL ? page->title : this->selected_generic_title);
				break;
			}
			case WID_SB_CAPTION:
				if (this->window_number == INVALID_COMPANY) {
					SetDParam(0, STR_STORY_BOOK_SPECTATOR_CAPTION);
				} else {
					SetDParam(0, STR_STORY_BOOK_CAPTION);
					SetDParam(1, this->window_number);
				}
				break;
		}
	}

	virtual void DrawWidget(const Rect &r, int widget) const
	{
		if (widget != WID_SB_PAGE_PANEL) return;

		StoryPage *page = this->GetSelPage();
		if (page == NULL) return;

		const int x = r.left + WD_FRAMETEXT_LEFT;
		const int y = r.top + WD_FRAMETEXT_TOP;
		const int right = r.right - WD_FRAMETEXT_RIGHT;
		const int bottom = r.bottom - WD_FRAMETEXT_BOTTOM;

		/* Set up a clipping region for the panel. */
		DrawPixelInfo tmp_dpi;
		if (!FillDrawPixelInfo(&tmp_dpi, x, y, right - x + 1, r.bottom - y + 1)) return;

		DrawPixelInfo *old_dpi = _cur_dpi;
		_cur_dpi = &tmp_dpi;

		/* Draw content (now coordinates given to Draw** are local to the new clipping region). */
		int line_height = GetStringHeight(STR_JUST_NOTHING, INT_MAX);
		int y_offset = - this->vscroll->GetPosition() * line_height;

		/* Date */
		SetDParam(0, page->date);
		DrawString(0, right - x, y_offset, STR_JUST_DATE_LONG, TC_BLACK);
		y_offset += line_height;

		/* Title */
		SetDParamStr(0, page->title != NULL ? page->title : this->selected_generic_title);
		y_offset = DrawStringMultiLine(0, right - x, y_offset, bottom - y, STR_STORY_BOOK_TITLE, TC_BLACK, SA_TOP | SA_HOR_CENTER);

		/* Page elements */
		for (const StoryPageElement *const*iter = this->story_page_elements.Begin(); iter != this->story_page_elements.End(); iter++) {
			const StoryPageElement *const pe = *iter;
			y_offset += line_height; // margin to previous element

			switch (pe->type) {
				case SPET_TEXT:
					SetDParamStr(0, pe->text);
					y_offset = DrawStringMultiLine(0, right - x, y_offset, bottom - y, STR_JUST_RAW_STRING, TC_BLACK, SA_TOP | SA_LEFT);
					break;

				case SPET_GOAL: {
					Goal *g = Goal::Get((GoalID) pe->referenced_id);
					if (g != NULL) {
						SetDParamStr(0, g->text);
						DrawActionElement(y_offset, right - x, line_height, GetPageElementSprite(*pe));
					} else {
						y_offset += line_height;
					}
					break;
				}

				case SPET_LOCATION:
					SetDParamStr(0, pe->text);
					DrawActionElement(y_offset, right - x, line_height, GetPageElementSprite(*pe));
					break;
			}
		}

		/* Restore clipping region. */
		_cur_dpi = old_dpi;
	}

	virtual void UpdateWidgetSize(int widget, Dimension *size, const Dimension &padding, Dimension *fill, Dimension *resize)
	{
		if (widget != WID_SB_SEL_PAGE && widget != WID_SB_PAGE_PANEL) return;

		Dimension d = GetStringBoundingBox(STR_JUST_NOTHING);
		d.width = 0;

		switch(widget) {
			case WID_SB_SEL_PAGE: {

				/* Get max title width. */
				for (uint16 i = 0; i < this->story_pages.Length(); i++) {
					const StoryPage *s = this->story_pages[i];

					if (s->title != NULL) {
						SetDParamStr(0, s->title);
					} else {
						SetDParamStr(0, this->selected_generic_title);
					}
					Dimension title_d = GetStringBoundingBox(STR_BLACK_RAW_STRING);

					if (title_d.width > d.width) {
						d.width = title_d.width;
					}
				}

				d.width += padding.width + WD_DROPDOWNTEXT_LEFT + WD_DROPDOWNTEXT_RIGHT;
				d.height += padding.height + WD_DROPDOWNTEXT_TOP + WD_DROPDOWNTEXT_BOTTOM;
				*size = maxdim(*size, d);
				break;
			}

			case WID_SB_PAGE_PANEL: {
				resize->height = d.height;

				d.height *= 5;
				d.height += padding.height + WD_FRAMETEXT_TOP + WD_FRAMETEXT_BOTTOM;
				*size = maxdim(*size, d);
				break;
			}
		}

	}

	virtual void OnResize()
	{
		this->vscroll->SetCapacityFromWidget(this, WID_SB_PAGE_PANEL, WD_FRAMETEXT_TOP + WD_FRAMETEXT_BOTTOM);
		this->vscroll->SetCount(this->CountLines());
	}

	virtual void OnClick(Point pt, int widget, int click_count)
	{
		switch (widget) {
			case WID_SB_SEL_PAGE: {
				DropDownList *list = this->BuildDropDownList();
				if (list != NULL) {
					/* Get the index of selected page. */
					int selected = 0;
					for (uint16 i = 0; i < this->story_pages.Length(); i++) {
						const StoryPage *p = this->story_pages[i];
						if (p->index == this->selected_page_id) break;
						selected++;
					}

					ShowDropDownList(this, list, selected, widget);
				}
				break;
			}

			case WID_SB_PREV_PAGE:
				this->SelectPrevPage();
				break;

			case WID_SB_NEXT_PAGE:
				this->SelectNextPage();
				break;

			case WID_SB_PAGE_PANEL: {
				uint clicked_row = this->vscroll->GetScrolledRowFromWidget(pt.y, this, WID_SB_PAGE_PANEL, WD_FRAMETEXT_TOP);
				uint max_width = GetAvailablePageContentWidth();

				/* Skip head rows. */
				uint n_head_rows = this->CountHeadLines(max_width);
				if (clicked_row < n_head_rows) return;

				/* Detect if a page element was clicked. */
				uint row = n_head_rows;
				for (const StoryPageElement *const*iter = this->story_page_elements.Begin(); iter != this->story_page_elements.End(); iter++) {
					const StoryPageElement *const pe = *iter;

					row += 1; // margin row

					uint content_rows = CountPageElementLines(*pe, max_width);
					if (clicked_row >= row && clicked_row < row + content_rows) {
						this->OnPageElementClick(*pe);
						return;
					}

					row += content_rows;
				}
			}
		}
	}

	virtual void OnDropdownSelect(int widget, int index)
	{
		if (widget != WID_SB_SEL_PAGE) return;

		/* index (which is set in BuildDropDownList) is the page id. */
		this->SetSelectedPage(index);
	}

	/**
	 * Some data on this window has become invalid.
	 * @param data Information about the changed data.
	 *   -1     Rebuild page list and refresh current page;
	 *   >= 0   Id of the page that needs to be refreshed. If it is not the current page, nothing happens.
	 * @param gui_scope Whether the call is done from GUI scope. You may not do everything when not in GUI scope. See #InvalidateWindowData() for details.
	 */
	virtual void OnInvalidateData(int data = 0, bool gui_scope = true)
	{
		if (!gui_scope) return;

		/* If added/removed page, force rebuild. Sort order never change so just a
		 * re-sort is never needed.
		 */
		if (data == -1) {
			this->story_pages.ForceRebuild();
			this->BuildStoryPageList();

			/* Was the last page removed? */
			if (this->story_pages.Length() == 0) {
				this->selected_generic_title[0] = '\0';
			}

			/* Verify page selection. */
			if (!_story_page_pool.IsValidID(this->selected_page_id)) {
				this->selected_page_id = INVALID_STORY_PAGE;
			}
			if (this->selected_page_id == INVALID_STORY_PAGE && this->story_pages.Length() > 0) {
				/* No page is selected, but there exist at least one available.
				 * => Select first page.
				 */
				this->SetSelectedPage(this->story_pages[0]->index);
			}

			this->SetWidgetDisabledState(WID_SB_SEL_PAGE, this->story_pages.Length() == 0);
			this->SetWidgetDirty(WID_SB_SEL_PAGE);
			this->UpdatePrevNextDisabledState();
		} else if (data >= 0 && this->selected_page_id == data) {
			this->RefreshSelectedPage();
		}
	}
};

GUIStoryPageList::SortFunction * const StoryBookWindow::page_sorter_funcs[] = {
	&PageOrderSorter,
};

GUIStoryPageElementList::SortFunction * const StoryBookWindow::page_element_sorter_funcs[] = {
	&PageElementOrderSorter,
};

static const NWidgetPart _nested_story_book_widgets[] = {
	NWidget(NWID_HORIZONTAL),
		NWidget(WWT_CLOSEBOX, COLOUR_BROWN),
		NWidget(WWT_CAPTION, COLOUR_BROWN, WID_SB_CAPTION), SetDataTip(STR_JUST_STRING, STR_TOOLTIP_WINDOW_TITLE_DRAG_THIS),
		NWidget(WWT_SHADEBOX, COLOUR_BROWN),
		NWidget(WWT_DEFSIZEBOX, COLOUR_BROWN),
		NWidget(WWT_STICKYBOX, COLOUR_BROWN),
	EndContainer(),
	NWidget(NWID_HORIZONTAL), SetFill(1, 1),
		NWidget(NWID_VERTICAL), SetFill(1, 1),
			NWidget(WWT_PANEL, COLOUR_BROWN, WID_SB_PAGE_PANEL), SetResize(1, 1), SetScrollbar(WID_SB_SCROLLBAR), EndContainer(),
			NWidget(NWID_HORIZONTAL),
				NWidget(WWT_TEXTBTN, COLOUR_BROWN, WID_SB_PREV_PAGE), SetMinimalSize(100, 0), SetFill(0, 0), SetDataTip(STR_STORY_BOOK_PREV_PAGE, STR_STORY_BOOK_PREV_PAGE_TOOLTIP),
				NWidget(NWID_BUTTON_DROPDOWN, COLOUR_BROWN, WID_SB_SEL_PAGE), SetMinimalSize(93, 12), SetFill(1, 0),
														SetDataTip(STR_BLACK_RAW_STRING, STR_STORY_BOOK_SEL_PAGE_TOOLTIP), SetResize(1, 0),
				NWidget(WWT_TEXTBTN, COLOUR_BROWN, WID_SB_NEXT_PAGE), SetMinimalSize(100, 0), SetFill(0, 0), SetDataTip(STR_STORY_BOOK_NEXT_PAGE, STR_STORY_BOOK_NEXT_PAGE_TOOLTIP),
			EndContainer(),
		EndContainer(),
		NWidget(NWID_VERTICAL), SetFill(0, 1),
			NWidget(NWID_VSCROLLBAR, COLOUR_BROWN, WID_SB_SCROLLBAR),
			NWidget(WWT_RESIZEBOX, COLOUR_BROWN),
		EndContainer(),
	EndContainer(),
};

static WindowDesc _story_book_desc(
	WDP_CENTER, "view_story", 400, 300,
	WC_STORY_BOOK, WC_NONE,
	0,
	_nested_story_book_widgets, lengthof(_nested_story_book_widgets)
);

void ShowStoryBook(CompanyID company, uint16 page_id)
{
	if (!Company::IsValidID(company)) company = (CompanyID)INVALID_COMPANY;

	StoryBookWindow *w = AllocateWindowDescFront<StoryBookWindow>(&_story_book_desc, company);
	if (page_id != INVALID_STORY_PAGE) {
		if (w == NULL) w = (StoryBookWindow *)FindWindowById(WC_STORY_BOOK, company);
		w->SetSelectedPage(page_id);
	}
}