summaryrefslogtreecommitdiff
path: root/src/window_gui.h
blob: 2e9b590b850da2aaf7c08da01039163b8d4d0758 (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
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
/* $Id$ */

/*
 * 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 window_gui.h Functions, definitions and such used only by the GUI. */

#ifndef WINDOW_GUI_H
#define WINDOW_GUI_H

#include "core/geometry_func.hpp"
#include "core/math_func.hpp"
#include "vehicle_type.h"
#include "viewport_type.h"
#include "company_type.h"
#include "core/alloc_type.hpp"
#include "window_type.h"
#include "tile_type.h"
#include "widget_type.h"

/**
 * Flags to describe the look of the frame
 */
enum FrameFlags {
	FR_NONE         =  0,
	FR_TRANSPARENT  =  1 << 0,  ///< Makes the background transparent if set
	FR_BORDERONLY   =  1 << 4,  ///< Draw border only, no background
	FR_LOWERED      =  1 << 5,  ///< If set the frame is lowered and the background colour brighter (ie. buttons when pressed)
	FR_DARKENED     =  1 << 6,  ///< If set the background is darker, allows for lowered frames with normal background colour when used with FR_LOWERED (ie. dropdown boxes)
};

DECLARE_ENUM_AS_BIT_SET(FrameFlags);

/** Distances used in drawing widgets. */
enum WidgetDrawDistances {
	/* WWT_IMGBTN */
	WD_IMGBTN_LEFT    = 1,      ///< Left offset of the image in the button.
	WD_IMGBTN_RIGHT   = 2,      ///< Right offset of the image in the button.
	WD_IMGBTN_TOP     = 1,      ///< Top offset of image in the button.
	WD_IMGBTN_BOTTOM  = 2,      ///< Bottom offset of image in the button.

	/* WWT_IMGBTN_2 */
	WD_IMGBTN2_LEFT   = 1,      ///< Left offset of the images in the button.
	WD_IMGBTN2_RIGHT  = 3,      ///< Right offset of the images in the button.
	WD_IMGBTN2_TOP    = 1,      ///< Top offset of images in the button.
	WD_IMGBTN2_BOTTOM = 3,      ///< Bottom offset of images in the button.

	/* WWT_INSET */
	WD_INSET_LEFT  = 2,         ///< Left offset of string.
	WD_INSET_RIGHT = 2,         ///< Right offset of string.
	WD_INSET_TOP   = 1,         ///< Top offset of string.

	WD_VSCROLLBAR_WIDTH  = 12,  ///< Width of a vertical scrollbar.

	WD_HSCROLLBAR_HEIGHT = 12,  ///< Height of a horizontal scrollbar.

	/* FrameRect widgets, all text buttons, panel, editbox */
	WD_FRAMERECT_LEFT   = 2,    ///< Offset at left to draw the frame rectangular area
	WD_FRAMERECT_RIGHT  = 2,    ///< Offset at right to draw the frame rectangular area
	WD_FRAMERECT_TOP    = 1,    ///< Offset at top to draw the frame rectangular area
	WD_FRAMERECT_BOTTOM = 1,    ///< Offset at bottom to draw the frame rectangular area

	/* Extra space at top/bottom of text panels */
	WD_TEXTPANEL_TOP    = 6,    ///< Offset at top to draw above the text
	WD_TEXTPANEL_BOTTOM = 6,   ///< Offset at bottom to draw below the text

	/* WWT_FRAME */
	WD_FRAMETEXT_LEFT  = 6,     ///< Left offset of the text of the frame.
	WD_FRAMETEXT_RIGHT = 6,     ///< Right offset of the text of the frame.

	/* WWT_MATRIX */
	WD_MATRIX_LEFT   = 2,       ///< Offset at left of a matrix cell.
	WD_MATRIX_RIGHT  = 2,       ///< Offset at right of a matrix cell.
	WD_MATRIX_TOP    = 3,       ///< Offset at top of a matrix cell.
	WD_MATRIX_BOTTOM = 1,       ///< Offset at bottom of a matrix cell.

	/* WWT_STICKYBOX */
	WD_STICKYBOX_WIDTH  = 12,   ///< Width of a standard sticky box widget.
	WD_STICKYBOX_LEFT   = 2,    ///< Left offset of sticky sprite.
	WD_STICKYBOX_RIGHT  = 2,    ///< Right offset of sticky sprite.
	WD_STICKYBOX_TOP    = 3,    ///< Top offset of sticky sprite.
	WD_STICKYBOX_BOTTOM = 3,    ///< Bottom offset of sticky sprite.

	/* WWT_RESIZEBOX */
	WD_RESIZEBOX_WIDTH  = 12,   ///< Width of a resize box widget.
	WD_RESIZEBOX_LEFT   = 3,    ///< Left offset of resize sprite.
	WD_RESIZEBOX_RIGHT  = 2,    ///< Right offset of resize sprite.
	WD_RESIZEBOX_TOP    = 3,    ///< Top offset of resize sprite.
	WD_RESIZEBOX_BOTTOM = 2,    ///< Bottom offset of resize sprite.

	/* WWT_CLOSEBOX */
	WD_CLOSEBOX_WIDTH  = 11,    ///< Width of a close box widget.
	WD_CLOSEBOX_LEFT   = 2,     ///< Left offset of closebox string.
	WD_CLOSEBOX_RIGHT  = 1,     ///< Right offset of closebox string.
	WD_CLOSEBOX_TOP    = 2,     ///< Top offset of closebox string.
	WD_CLOSEBOX_BOTTOM = 2,     ///< Bottom offset of closebox string.

	/* WWT_CAPTION */
	WD_CAPTION_HEIGHT     = 14, ///< Height of a title bar.
	WD_CAPTIONTEXT_LEFT   = 2,  ///< Offset of the caption text at the left.
	WD_CAPTIONTEXT_RIGHT  = 2,  ///< Offset of the caption text at the right.
	WD_CAPTIONTEXT_TOP    = 2,  ///< Offset of the caption text at the top.
	WD_CAPTIONTEXT_BOTTOM = 2,  ///< Offset of the caption text at the bottom.

	/* Dropdown widget. */
	WD_DROPDOWN_HEIGHT     = 12, ///< Height of a drop down widget.
	WD_DROPDOWNTEXT_LEFT   = 2,  ///< Left offset of the dropdown widget string.
	WD_DROPDOWNTEXT_RIGHT  = 14, ///< Right offset of the dropdown widget string.
	WD_DROPDOWNTEXT_TOP    = 1,  ///< Top offset of the dropdown widget string.
	WD_DROPDOWNTEXT_BOTTOM = 1,  ///< Bottom offset of the dropdown widget string.

	WD_SORTBUTTON_ARROW_WIDTH = 11, ///< Width of up/down arrow of sort button state.

	WD_PAR_VSEP_NORMAL = 2,      ///< Amount of vertical space between two paragraphs of text.
};

/* wiget.cpp */
void DrawFrameRect(int left, int top, int right, int bottom, Colours colour, FrameFlags flags);

/* window.cpp */
extern Window *_z_front_window;
extern Window *_z_back_window;
extern Window *_focused_window;

/**
 * High level window description
 */
struct WindowDesc : ZeroedMemoryAllocator {

	WindowDesc(int16 left, int16 top, int16 min_width, int16 min_height, int16 def_width, int16 def_height,
			WindowClass window_class, WindowClass parent_class, uint32 flags, const Widget *widgets,
			const NWidgetPart *nwid_parts = NULL, int16 nwid_length = 0);

	~WindowDesc();

	int16 left;                    ///< Prefered x position of left edge of the window. @see WindowDefaultPosition()
	int16 top;                     ///< Prefered y position of the top of the window. @see WindowDefaultPosition()
	int16 minimum_width;           ///< Minimal width of the window.
	int16 minimum_height;          ///< Minimal height of the window.
	int16 default_width;           ///< Prefered initial width of the window.
	int16 default_height;          ///< Prefered initial height of the window.
	WindowClass cls;               ///< Class of the window, @see WindowClass.
	WindowClass parent_cls;        ///< Class of the parent window. @see WindowClass
	uint32 flags;                  ///< Flags. @see WindowDefaultFlags
	const Widget *widgets;         ///< List of widgets with their position and size for the window.
	const NWidgetPart *nwid_parts; ///< Nested widget parts describing the window.
	int16 nwid_length;             ///< Length of the #nwid_parts array.
	mutable Widget *new_widgets;   ///< Widgets generated from #nwid_parts.

	const Widget *GetWidgets() const;
};

/**
 * Window default widget/window handling flags
 */
enum WindowDefaultFlag {
	WDF_STD_TOOLTIPS    =   1 << 0, ///< use standard routine when displaying tooltips
	WDF_DEF_WIDGET      =   1 << 1, ///< Default widget control for some widgets in the on click event, @see DispatchLeftClickEvent()
	WDF_STD_BTN         =   1 << 2, ///< Default handling for close and titlebar widgets (the widgets with type WWT_CLOSEBOX and WWT_CAPTION).
	WDF_CONSTRUCTION    =   1 << 3, ///< This window is used for construction; close it whenever changing company.

	WDF_UNCLICK_BUTTONS =   1 << 4, ///< Unclick buttons when the window event times out
	WDF_STICKY_BUTTON   =   1 << 5, ///< Set window to sticky mode; they are not closed unless closed with 'X' (widget with type WWT_STICKYBOX).
	WDF_RESIZABLE       =   1 << 6, ///< Window can be resized
	WDF_MODAL           =   1 << 7, ///< The window is a modal child of some other window, meaning the parent is 'inactive'

	WDF_NO_FOCUS        =   1 << 8, ///< This window won't get focus/make any other window lose focus when click
};

/**
 * Special values for 'left' and 'top' to cause a specific placement
 */
enum WindowDefaultPosition {
	WDP_AUTO      = -1, ///< Find a place automatically
	WDP_CENTER    = -2, ///< Center the window (left/right or top/bottom)
	WDP_ALIGN_TBR = -3, ///< Align the right side of the window with the right side of the main toolbar
	WDP_ALIGN_TBL = -4, ///< Align the left side of the window with the left side of the main toolbar
};

/**
 * Scrollbar data structure
 */
class Scrollbar {
private:
	uint16 count;  ///< Number of elements in the list
	uint16 cap;    ///< Number of visible elements of the scroll bar
	uint16 pos;    ///< Index of first visible item of the list
public:
	/**
	 * Gets the number of elements in the list
	 * @return the number of elements
	 */
	FORCEINLINE uint16 GetCount() const
	{
		return this->count;
	}

	/**
	 * Gets the number of visible elements of the scrollbar
	 * @return the number of visible elements
	 */
	FORCEINLINE uint16 GetCapacity() const
	{
		return this->cap;
	}

	/**
	 * Gets the position of the first visible element in the list
	 * @return the position of the element
	 */
	FORCEINLINE uint16 GetPosition() const
	{
		return this->pos;
	}

	/**
	 * Checks whether given current item is visible in the list
	 * @param item to check
	 * @return true iff the item is visible
	 */
	FORCEINLINE bool IsVisible(uint16 item) const
	{
		return IsInsideBS(item, this->GetPosition(), this->GetCapacity());
	}

	/**
	 * Sets the number of elements in the list
	 * @param num the number of elements in the list
	 * @note updates the position if needed
	 */
	void SetCount(int num)
	{
		assert(num >= 0);
		assert(num <= MAX_UVALUE(uint16));

		this->count = num;
		num -= this->cap;
		if (num < 0) num = 0;
		if (num < this->pos) this->pos = num;
	}

	/**
	 * Set the capacity of visible elements.
	 * @param capacity the new capacity
	 * @note updates the position if needed
	 */
	void SetCapacity(int capacity)
	{
		assert(capacity > 0);
		assert(capacity <= MAX_UVALUE(uint16));

		this->cap = capacity;
		if (this->cap + this->pos > this->count) this->pos = max(0, this->count - this->cap);
	}

	/**
	 * Updates the capacity by adding/removing a number of (visible) elements.
	 * @param difference the difference in capacity
	 * @note updates the position if needed
	 */
	void UpdateCapacity(int difference)
	{
		if (difference == 0) return;
		this->SetCapacity(this->cap + difference);
	}

	/**
	 * Sets the position of the first visible element
	 * @param position the position of the element
	 */
	void SetPosition(int position)
	{
		assert(position >= 0);
		assert(this->count <= this->cap ? (position == 0) : (position + this->cap <= this->count));
		this->pos = position;
	}

	/**
	 * Updates the position of the first visible element by the given amount.
	 * If the position would be too low or high it will be clamped appropriately
	 * @param difference the amount of change requested
	 */
	void UpdatePosition(int difference)
	{
		if (difference == 0) return;
		this->SetPosition(Clamp(this->pos + difference, 0, max(this->count - this->cap, 0)));
	}

	/**
	 * Scroll towards the given position; if the item is visible nothing
	 * happens, otherwise it will be shown either at the bottom or top of
	 * the window depending on where in the list it was.
	 * @param position the position to scroll towards.
	 */
	void ScrollTowards(int position)
	{
		if (position < this->GetPosition()) {
			/* scroll up to the item */
			this->SetPosition(position);
		} else if (position >= this->GetPosition() + this->GetCapacity()) {
			/* scroll down so that the item is at the bottom */
			this->SetPosition(position - this->GetCapacity() + 1);
		}
	}
};

/**
 * Data structure for resizing a window
 */
struct ResizeInfo {
	uint width;       ///< Minimum allowed width of the window
	uint height;      ///< Minimum allowed height of the window
	uint step_width;  ///< Step-size of width resize changes
	uint step_height; ///< Step-size of height resize changes
};

/** State of a sort direction button. */
enum SortButtonState {
	SBS_OFF,  ///< Do not sort (with this button).
	SBS_DOWN, ///< Sort ascending.
	SBS_UP,   ///< Sort descending.
};

/**
 * Data structure for a window viewport.
 * A viewport is either following a vehicle (its id in then in #follow_vehicle), or it aims to display a specific
 * location #dest_scrollpos_x, #dest_scrollpos_y (#follow_vehicle is then #INVALID_VEHICLE).
 * The actual location being shown is #scrollpos_x, #scrollpos_y.
 * @see InitializeViewport(), UpdateViewportPosition(), UpdateViewportCoordinates().
 */
struct ViewportData : ViewPort {
	VehicleID follow_vehicle; ///< VehicleID to follow if following a vehicle, #INVALID_VEHICLE otherwise.
	int32 scrollpos_x;        ///< Currently shown x coordinate (virtual screen coordinate of topleft corner of the viewport).
	int32 scrollpos_y;        ///< Currently shown y coordinate (virtual screen coordinate of topleft corner of the viewport).
	int32 dest_scrollpos_x;   ///< Current destination x coordinate to display (virtual screen coordinate of topleft corner of the viewport).
	int32 dest_scrollpos_y;   ///< Current destination y coordinate to display (virtual screen coordinate of topleft corner of the viewport).
};

/**
 * Data structure for an opened window
 */
struct Window : ZeroedMemoryAllocator {
	/** State whether an event is handled or not */
	enum EventState {
		ES_HANDLED,     ///< The passed event is handled
		ES_NOT_HANDLED, ///< The passed event is not handled
	};

protected:
	void InitializeData(WindowClass cls, const Widget *widget, int window_number);
	void InitializePositionSize(int x, int y, int min_width, int min_height);
	void FindWindowPlacementAndResize(int def_width, int def_height);
	void FindWindowPlacementAndResize(const WindowDesc *desc);

public:
	Window(int x, int y, int width, int height, WindowClass cls, const Widget *widget);
	Window(const WindowDesc *desc, WindowNumber number = 0);
	Window();

	virtual ~Window();
	/* Don't allow arrays; arrays of Windows are pointless as you need
	 * to destruct them all at the same time too, which is kinda hard. */
	FORCEINLINE void *operator new[](size_t size) { NOT_REACHED(); }
	/* Don't free the window directly; it corrupts the linked list when iterating */
	FORCEINLINE void operator delete(void *ptr, size_t size) {}

	uint16 flags4;              ///< Window flags, @see WindowFlags
	WindowClass window_class;   ///< Window class
	WindowNumber window_number; ///< Window number within the window class

	int left;   ///< x position of left edge of the window
	int top;    ///< y position of top edge of the window
	int width;  ///< width of the window (number of pixels to the right in x direction)
	int height; ///< Height of the window (number of pixels down in y direction)

	Scrollbar hscroll;  ///< Horizontal scroll bar
	Scrollbar vscroll;  ///< First vertical scroll bar
	Scrollbar vscroll2; ///< Second vertical scroll bar
	ResizeInfo resize;  ///< Resize information

	Owner owner;        ///< The owner of the content shown in this window. Company colour is acquired from this variable.

	ViewportData *viewport;          ///< Pointer to viewport data, if present.
	Widget *widget;                  ///< Widgets of the window.
	uint widget_count;               ///< Number of widgets of the window.
	uint32 desc_flags;               ///< Window/widgets default flags setting. @see WindowDefaultFlag
	const Widget *focused_widget;    ///< Currently focused widget, or \c NULL if no widget has focus.
	const NWidgetCore *nested_focus; ///< Currently focused nested widget, or \c NULL if no nested widget has focus.
	NWidgetBase *nested_root;        ///< Root of the nested tree.
	NWidgetBase **nested_array;      ///< Array of pointers into the tree. Do not access directly, use #Window::GetWidget() instead.
	uint nested_array_size;          ///< Size of the nested array.

	Window *parent;                  ///< Parent window.
	Window *z_front;                 ///< The window in front of us in z-order.
	Window *z_back;                  ///< The window behind us in z-order.

	template <class NWID>
	inline NWID *GetWidget(uint widnum) const;


	void InitNested(const WindowDesc *desc, WindowNumber number = 0);
	void CreateNestedTree(const WindowDesc *desc, bool fill_nested = true);
	void FinishInitNested(const WindowDesc *desc, WindowNumber window_number);

	/**
	 * Sets the enabled/disabled status of a widget.
	 * By default, widgets are enabled.
	 * On certain conditions, they have to be disabled.
	 * @param widget_index index of this widget in the window
	 * @param disab_stat status to use ie: disabled = true, enabled = false
	 */
	inline void SetWidgetDisabledState(byte widget_index, bool disab_stat)
	{
		if (this->widget != NULL) {
			assert(widget_index < this->widget_count);
			SB(this->widget[widget_index].display_flags, WIDG_DISABLED, 1, !!disab_stat);
		}
		if (this->nested_array != NULL) {
			assert(widget_index < this->nested_array_size);
			if (this->nested_array[widget_index] != NULL) this->GetWidget<NWidgetCore>(widget_index)->SetDisabled(disab_stat);
		}
	}

	/**
	 * Sets a widget to disabled.
	 * @param widget_index index of this widget in the window
	 */
	inline void DisableWidget(byte widget_index)
	{
		SetWidgetDisabledState(widget_index, true);
	}

	/**
	 * Sets a widget to Enabled.
	 * @param widget_index index of this widget in the window
	 */
	inline void EnableWidget(byte widget_index)
	{
		SetWidgetDisabledState(widget_index, false);
	}

	/**
	 * Gets the enabled/disabled status of a widget.
	 * @param widget_index index of this widget in the window
	 * @return status of the widget ie: disabled = true, enabled = false
	 */
	inline bool IsWidgetDisabled(byte widget_index) const
	{
		if (this->nested_array != NULL) {
			assert(widget_index < this->nested_array_size);
			return this->GetWidget<NWidgetCore>(widget_index)->IsDisabled();
		}
		assert(widget_index < this->widget_count);
		return HasBit(this->widget[widget_index].display_flags, WIDG_DISABLED);
	}

	/**
	 * Sets the hidden/shown status of a widget.
	 * By default, widgets are visible.
	 * On certain conditions, they have to be hidden.
	 * @param widget_index index of this widget in the window
	 * @param hidden_stat status to use ie. hidden = true, visible = false
	 */
	inline void SetWidgetHiddenState(byte widget_index, bool hidden_stat)
	{
		assert(widget_index < this->widget_count);
		SB(this->widget[widget_index].display_flags, WIDG_HIDDEN, 1, !!hidden_stat);
	}

	/**
	 * Sets a widget hidden.
	 * @param widget_index index of this widget in the window
	 */
	inline void HideWidget(byte widget_index)
	{
		SetWidgetHiddenState(widget_index, true);
	}

	/**
	 * Sets a widget visible.
	 * @param widget_index index of this widget in the window
	 */
	inline void ShowWidget(byte widget_index)
	{
		SetWidgetHiddenState(widget_index, false);
	}

	/**
	 * Gets the visibility of a widget.
	 * @param widget_index index of this widget in the window
	 * @return status of the widget ie: hidden = true, visible = false
	 */
	inline bool IsWidgetHidden(byte widget_index) const
	{
		assert(widget_index < this->widget_count);
		return HasBit(this->widget[widget_index].display_flags, WIDG_HIDDEN);
	}

	/**
	 * Check if given widget is focused within this window
	 * @param widget_index : index of the widget in the window to check
	 * @return true if given widget is the focused window in this window
	 */
	inline bool IsWidgetFocused(byte widget_index) const
	{
		return (this->widget != NULL && this->focused_widget == &this->widget[widget_index]) ||
			(this->nested_focus != NULL && this->nested_focus->index == widget_index);
	}

	/**
	 * Check if given widget has user input focus. This means that both the window
	 * has focus and that the given widget has focus within the window.
	 * @param widget_index : index of the widget in the window to check
	 * @return true if given widget is the focused window in this window and this window has focus
	 */
	inline bool IsWidgetGloballyFocused(byte widget_index) const
	{
		return _focused_window == this && IsWidgetFocused(widget_index);
	}

	/**
	 * Sets the lowered/raised status of a widget.
	 * @param widget_index index of this widget in the window
	 * @param lowered_stat status to use ie: lowered = true, raised = false
	 */
	inline void SetWidgetLoweredState(byte widget_index, bool lowered_stat)
	{
		if (this->widget != NULL) {
			assert(widget_index < this->widget_count);
			SB(this->widget[widget_index].display_flags, WIDG_LOWERED, 1, !!lowered_stat);
		}
		if (this->nested_array != NULL) {
			assert(widget_index < this->nested_array_size);
			this->GetWidget<NWidgetCore>(widget_index)->SetLowered(lowered_stat);
		}
	}

	/**
	 * Invert the lowered/raised  status of a widget.
	 * @param widget_index index of this widget in the window
	 */
	inline void ToggleWidgetLoweredState(byte widget_index)
	{
		if (this->widget != NULL) {
			assert(widget_index < this->widget_count);
			ToggleBit(this->widget[widget_index].display_flags, WIDG_LOWERED);
		}
		if (this->nested_array != NULL) {
			assert(widget_index < this->nested_array_size);
			bool lowered_state = this->GetWidget<NWidgetCore>(widget_index)->IsLowered();
			this->GetWidget<NWidgetCore>(widget_index)->SetLowered(!lowered_state);
		}
	}

	/**
	 * Marks a widget as lowered.
	 * @param widget_index index of this widget in the window
	 */
	inline void LowerWidget(byte widget_index)
	{
		SetWidgetLoweredState(widget_index, true);
	}

	/**
	 * Marks a widget as raised.
	 * @param widget_index index of this widget in the window
	 */
	inline void RaiseWidget(byte widget_index)
	{
		SetWidgetLoweredState(widget_index, false);
	}

	/**
	 * Gets the lowered state of a widget.
	 * @param widget_index index of this widget in the window
	 * @return status of the widget ie: lowered = true, raised= false
	 */
	inline bool IsWidgetLowered(byte widget_index) const
	{
		if (this->nested_array != NULL) {
			assert(widget_index < this->nested_array_size);
			return this->GetWidget<NWidgetCore>(widget_index)->IsLowered();
		}
		assert(widget_index < this->widget_count);
		return HasBit(this->widget[widget_index].display_flags, WIDG_LOWERED);
	}

	/**
	 * Align widgets a and b next to each other.
	 * @param widget_index_a  the left widget
	 * @param widget_index_b  the right widget (fixed)
	 */
	inline void AlignWidgetRight(byte widget_index_a, byte widget_index_b)
	{
		assert(widget_index_a < this->widget_count);
		assert(widget_index_b < this->widget_count);
		int w = this->widget[widget_index_a].right - this->widget[widget_index_a].left;
		this->widget[widget_index_a].right = this->widget[widget_index_b].left - 1;
		this->widget[widget_index_a].left  = this->widget[widget_index_a].right - w;
	}

	/**
	 * Get the width of a widget.
	 * @param widget_index  the widget
	 * @return width of the widget
	 */
	inline int GetWidgetWidth(byte widget_index) const
	{
		assert(widget_index < this->widget_count);
		return this->widget[widget_index].right - this->widget[widget_index].left + 1;
	}

	bool SetFocusedWidget(byte widget_index);

	void HandleButtonClick(byte widget);
	const Widget *GetWidgetOfType(WidgetType widget_type) const;

	void RaiseButtons(bool autoraise = false);
	void CDECL SetWidgetsDisabledState(bool disab_stat, int widgets, ...);
	void CDECL SetWidgetsHiddenState(bool hidden_stat, int widgets, ...);
	void CDECL SetWidgetsLoweredState(bool lowered_stat, int widgets, ...);
	void SetWidgetDirty(byte widget_index) const;

	void DrawWidgets() const;
	void DrawViewport() const;
	void DrawSortButtonState(int widget, SortButtonState state) const;

	void DeleteChildWindows() const;

	void SetDirty() const;
	void ReInit();

	/**
	 * Mark this window's data as invalid (in need of re-computing)
	 * @param data The data to invalidate with
	 */
	void InvalidateData(int data = 0)
	{
		this->SetDirty();
		this->OnInvalidateData(data);
	}

	/*** Event handling ***/

	/**
	 * The window must be repainted.
	 * @note This method should not change any state, it should only use drawing functions.
	 */
	virtual void OnPaint() {}

	/**
	 * Draw the contents of a nested widget.
	 * @param r      Rectangle occupied by the widget.
	 * @param widget Number of the widget to draw.
	 * @note This method may not change any state, it may only use drawing functions.
	 */
	virtual void DrawWidget(const Rect &r, int widget) const {}

	/**
	 * Update size and resize step of a widget in the window.
	 * After retrieval of the minimal size and the resize-steps of a widget, this function is called to allow further refinement,
	 * typically by computing the real maximal size of the content. Afterwards, \a size is taken to be the minimal size of the widget
	 * and \a resize is taken to contain the resize steps. For the convenience of the callee, \a padding contains the amount of
	 * padding between the content and the edge of the widget. This should be added to the returned size.
	 * @param widget  Widget number.
	 * @param size    Size of the widget.
	 * @param padding Recommended amount of space between the widget content and the widget edge.
	 * @param resize  Resize step of the widget.
	 */
	virtual void UpdateWidgetSize(int widget, Dimension *size, const Dimension &padding, Dimension *resize) {}

	/**
	 * Initialize string parameters for a widget.
	 * Calls to this function are made during initialization to measure the size (that is as part of #InitNested()), during drawing,
	 * and while re-initializing the window. Only for widgets that render text initializing is requested.
	 * @param widget  Widget number.
	 */
	virtual void SetStringParameters(int widget) const {}

	/**
	 * Called when window gains focus
	 */
	virtual void OnFocus() {}

	/**
	 * Called when window looses focus
	 */
	virtual void OnFocusLost() {}

	/**
	 * A key has been pressed.
	 * @param key     the Unicode value of the key.
	 * @param keycode the untranslated key code including shift state.
	 * @return ES_HANDLED if the key press has been handled and no other
	 *         window should receive the event.
	 */
	virtual EventState OnKeyPress(uint16 key, uint16 keycode) { return ES_NOT_HANDLED; }

	/**
	 * The state of the control key has changed
	 * @return ES_HANDLED if the change has been handled and no other
	 *         window should receive the event.
	 */
	virtual EventState OnCTRLStateChange() { return ES_NOT_HANDLED; }


	/**
	 * A click with the left mouse button has been made on the window.
	 * @param pt     the point inside the window that has been clicked.
	 * @param widget the clicked widget.
	 */
	virtual void OnClick(Point pt, int widget) {}

	/**
	 * A double click with the left mouse button has been made on the window.
	 * @param pt     the point inside the window that has been clicked.
	 * @param widget the clicked widget.
	 */
	virtual void OnDoubleClick(Point pt, int widget) {}

	/**
	 * A click with the right mouse button has been made on the window.
	 * @param pt     the point inside the window that has been clicked.
	 * @param widget the clicked widget.
	 */
	virtual void OnRightClick(Point pt, int widget) {}

	/**
	 * A dragged 'object' has been released.
	 * @param pt     the point inside the window where the release took place.
	 * @param widget the widget where the release took place.
	 */
	virtual void OnDragDrop(Point pt, int widget) {}

	/**
	 * Handle the request for (viewport) scrolling.
	 * @param delta the amount the viewport must be scrolled.
	 */
	virtual void OnScroll(Point delta) {}

	/**
	 * The mouse is currently moving over the window or has just moved outside
	 * of the window. In the latter case pt is (-1, -1).
	 * @param pt     the point inside the window that the mouse hovers over.
	 * @param widget the widget the mouse hovers over.
	 */
	virtual void OnMouseOver(Point pt, int widget) {}

	/**
	 * The mouse wheel has been turned.
	 * @param wheel the amount of movement of the mouse wheel.
	 */
	virtual void OnMouseWheel(int wheel) {}


	/**
	 * Called for every mouse loop run, which is at least once per (game) tick.
	 */
	virtual void OnMouseLoop() {}

	/**
	 * Called once per (game) tick.
	 */
	virtual void OnTick() {}

	/**
	 * Called once every 100 (game) ticks.
	 */
	virtual void OnHundredthTick() {}

	/**
	 * Called when this window's timeout has been reached.
	 */
	virtual void OnTimeout() {}


	/**
	 * Called after the window got resized.
	 * For nested windows with a viewport, call NWidgetViewport::UpdateViewportCoordinates.
	 * @param delta The amount of which the window size changed.
	 */
	virtual void OnResize(Point delta) {}

	/**
	 * A dropdown option associated to this window has been selected.
	 * @param widget the widget (button) that the dropdown is associated with.
	 * @param index  the element in the dropdown that is selected.
	 */
	virtual void OnDropdownSelect(int widget, int index) {}

	/**
	 * The query window opened from this window has closed.
	 * @param str the new value of the string or NULL if the window
	 *            was cancelled.
	 */
	virtual void OnQueryTextFinished(char *str) {}

	/**
	 * Some data on this window has become invalid.
	 * @param data information about the changed data.
	 */
	virtual void OnInvalidateData(int data = 0) {}


	/**
	 * The user clicked some place on the map when a tile highlight mode
	 * has been set.
	 * @param pt   the exact point on the map that has been clicked.
	 * @param tile the tile on the map that has been clicked.
	 */
	virtual void OnPlaceObject(Point pt, TileIndex tile) {}

	/**
	 * The user cancelled a tile highlight mode that has been set.
	 */
	virtual void OnPlaceObjectAbort() {}


	/**
	 * The user is dragging over the map when the tile highlight mode
	 * has been set.
	 * @param select_method the method of selection (allowed directions)
	 * @param select_proc   what will be created when the drag is over.
	 * @param pt            the exact point on the map where the mouse is.
	 */
	virtual void OnPlaceDrag(ViewportPlaceMethod select_method, ViewportDragDropSelectionProcess select_proc, Point pt) {}

	/**
	 * The user has dragged over the map when the tile highlight mode
	 * has been set.
	 * @param select_method the method of selection (allowed directions)
	 * @param select_proc   what should be created.
	 * @param pt            the exact point on the map where the mouse was released.
	 * @param start_tile    the begin tile of the drag.
	 * @param end_tile      the end tile of the drag.
	 */
	virtual void OnPlaceMouseUp(ViewportPlaceMethod select_method, ViewportDragDropSelectionProcess select_proc, Point pt, TileIndex start_tile, TileIndex end_tile) {}

	/**
	 * The user moves over the map when a tile highlight mode has been set
	 * when the special mouse mode has been set to 'PRESIZE' mode. An
	 * example of this is the tile highlight for dock building.
	 * @param pt   the exact point on the map where the mouse is.
	 * @param tile the tile on the map where the mouse is.
	 */
	virtual void OnPlacePresize(Point pt, TileIndex tile) {}

	/*** End of the event handling ***/
};

/** Get the nested widget with number \a widnum from the nested widget tree.
 * @tparam NWID Type of the nested widget.
 * @param widnum Widget number of the widget to retrieve.
 * @return The requested widget if it is instantiated, \c NULL otherwise.
 */
template <class NWID>
inline NWID *Window::GetWidget(uint widnum) const
{
	if (widnum >= this->nested_array_size || this->nested_array[widnum] == NULL) return NULL;
	NWID *nwid = dynamic_cast<NWID *>(this->nested_array[widnum]);
	assert(nwid != NULL);
	return nwid;
}

/** Specialized case of #Window::GetWidget for the nested widget base class. */
template <>
inline NWidgetBase *Window::GetWidget<NWidgetBase>(uint widnum) const
{
	if (widnum >= this->nested_array_size) return NULL;
	return this->nested_array[widnum];
}


/**
 * Base class for windows opened from a toolbar.
 */
class PickerWindowBase : public Window {

public:
	PickerWindowBase(const WindowDesc *desc, Window *parent, WindowNumber number = 0) : Window(desc, number)
	{
		this->parent = parent;
	};

	PickerWindowBase(Window *parent) : Window()
	{
		this->parent = parent;
	};

	virtual ~PickerWindowBase();
};

/**
 * Window flags
 */
enum WindowFlags {
	WF_TIMEOUT_TRIGGER   = 1,       ///< When the timeout should start triggering
	WF_TIMEOUT_BEGIN     = 7,       ///< The initial value for the timeout
	WF_TIMEOUT_MASK      = 7,       ///< Window timeout counter bit mask (3 bits)
	WF_DRAGGING          = 1 <<  3, ///< Window is being dragged
	WF_SCROLL_UP         = 1 <<  4, ///< Upper scroll button has been pressed, @see ScrollbarClickHandler()
	WF_SCROLL_DOWN       = 1 <<  5, ///< Lower scroll button has been pressed, @see ScrollbarClickHandler()
	WF_SCROLL_MIDDLE     = 1 <<  6, ///< Scrollbar scrolling, @see ScrollbarClickHandler()
	WF_SCROLL2           = 1 <<  7,
	WF_HSCROLL           = 1 <<  8,
	WF_SIZING_RIGHT      = 1 <<  9, ///< Window is being resized towards the right.
	WF_SIZING_LEFT       = 1 << 10, ///< Window is being resized towards the left.
	WF_SIZING            = WF_SIZING_RIGHT | WF_SIZING_LEFT, ///< Window is being resized.
	WF_STICKY            = 1 << 11, ///< Window is made sticky by user

	WF_DISABLE_VP_SCROLL = 1 << 12, ///< Window does not do autoscroll, @see HandleAutoscroll()

	WF_WHITE_BORDER_ONE  = 1 << 13,
	WF_WHITE_BORDER_MASK = 1 << 14 | WF_WHITE_BORDER_ONE,
};

Window *BringWindowToFrontById(WindowClass cls, WindowNumber number);
Window *FindWindowFromPt(int x, int y);

/**
 * Open a new window.
 * @param desc The pointer to the WindowDesc to be created
 * @param window_number the window number of the new window
 * @return see Window pointer of the newly created window
 */
template <typename Wcls>
Wcls *AllocateWindowDescFront(const WindowDesc *desc, int window_number)
{
	if (BringWindowToFrontById(desc->cls, window_number)) return NULL;
	return new Wcls(desc, window_number);
}

void RelocateAllWindows(int neww, int newh);

/* misc_gui.cpp */
void GuiShowTooltips(StringID str, uint paramcount = 0, const uint64 params[] = NULL, bool use_left_mouse_button = false);

/* widget.cpp */
int GetWidgetFromPos(const Window *w, int x, int y);

/** Iterate over all windows */
#define FOR_ALL_WINDOWS_FROM_BACK_FROM(w, start)  for (w = start; w != NULL; w = w->z_front) if (w->window_class != WC_INVALID)
#define FOR_ALL_WINDOWS_FROM_FRONT_FROM(w, start) for (w = start; w != NULL; w = w->z_back) if (w->window_class != WC_INVALID)
#define FOR_ALL_WINDOWS_FROM_BACK(w)  FOR_ALL_WINDOWS_FROM_BACK_FROM(w, _z_back_window)
#define FOR_ALL_WINDOWS_FROM_FRONT(w) FOR_ALL_WINDOWS_FROM_FRONT_FROM(w, _z_front_window)

extern Point _cursorpos_drag_start;

extern int _scrollbar_start_pos;
extern int _scrollbar_size;
extern byte _scroller_click_timeout;

extern bool _scrolling_scrollbar;
extern bool _scrolling_viewport;

extern byte _special_mouse_mode;
enum SpecialMouseMode {
	WSM_NONE     = 0,
	WSM_DRAGDROP = 1,
	WSM_SIZING   = 2,
	WSM_PRESIZE  = 3,
};

Window *GetCallbackWnd();

void SetFocusedWindow(Window *w);
bool EditBoxInGlobalFocus();

void ScrollbarClickHandler(Window *w, const Widget *wi, int x, int y);
void ScrollbarClickHandler(Window *w, const NWidgetCore *nw, int x, int y);

void ResizeButtons(Window *w, byte left, byte right);

void ResizeWindowForWidget(Window *w, uint widget, int delta_x, int delta_y);

#endif /* WINDOW_GUI_H */