summaryrefslogtreecommitdiff
path: root/src/widgets/dropdown.cpp
blob: dd23499655be94923b52b801b76e681cbb1aa84a (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
/* $Id$ */

/*
 * 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 dropdown.cpp Implementation of the dropdown widget. */

#include "../stdafx.h"
#include "../window_gui.h"
#include "../string_func.h"
#include "../strings_func.h"
#include "../window_func.h"
#include "dropdown_type.h"

#include "dropdown_widget.h"


void DropDownListItem::Draw(int left, int right, int top, int bottom, bool sel, int bg_colour) const
{
	int c1 = _colour_gradient[bg_colour][3];
	int c2 = _colour_gradient[bg_colour][7];

	int mid = top + this->Height(0) / 2;
	GfxFillRect(left + 1, mid - 2, right - 1, mid - 2, c1);
	GfxFillRect(left + 1, mid - 1, right - 1, mid - 1, c2);
}

uint DropDownListStringItem::Width() const
{
	char buffer[512];
	GetString(buffer, this->String(), lastof(buffer));
	return GetStringBoundingBox(buffer).width;
}

void DropDownListStringItem::Draw(int left, int right, int top, int bottom, bool sel, int bg_colour) const
{
	DrawString(left + WD_FRAMERECT_LEFT, right - WD_FRAMERECT_RIGHT, top, this->String(), sel ? TC_WHITE : TC_BLACK);
}

/**
 * Natural sorting comparator function for DropDownList::sort().
 * @param first Left side of comparison.
 * @param second Right side of comparison.
 * @return true if \a first precedes \a second.
 * @warning All items in the list need to be derivates of DropDownListStringItem.
 */
/* static */ bool DropDownListStringItem::NatSortFunc(const DropDownListItem *first, const DropDownListItem *second)
{
	char buffer1[512], buffer2[512];
	GetString(buffer1, static_cast<const DropDownListStringItem*>(first)->String(), lastof(buffer1));
	GetString(buffer2, static_cast<const DropDownListStringItem*>(second)->String(), lastof(buffer2));
	return strnatcmp(buffer1, buffer2) < 0;
}

StringID DropDownListParamStringItem::String() const
{
	for (uint i = 0; i < lengthof(this->decode_params); i++) SetDParam(i, this->decode_params[i]);
	return this->string;
}

StringID DropDownListCharStringItem::String() const
{
	SetDParamStr(0, this->raw_string);
	return this->string;
}

/**
 * Delete all items of a drop down list and the list itself
 * @param list List to delete.
 */
static void DeleteDropDownList(DropDownList *list)
{
	for (DropDownList::iterator it = list->begin(); it != list->end(); ++it) {
		DropDownListItem *item = *it;
		delete item;
	}
	delete list;
}

static const NWidgetPart _nested_dropdown_menu_widgets[] = {
	NWidget(NWID_HORIZONTAL),
		NWidget(WWT_PANEL, COLOUR_END, WID_DM_ITEMS), SetMinimalSize(1, 1), SetScrollbar(WID_DM_SCROLL), EndContainer(),
		NWidget(NWID_SELECTION, INVALID_COLOUR, WID_DM_SHOW_SCROLL),
			NWidget(NWID_VSCROLLBAR, COLOUR_END, WID_DM_SCROLL),
		EndContainer(),
	EndContainer(),
};

const WindowDesc _dropdown_desc(
	WDP_MANUAL, 0, 0,
	WC_DROPDOWN_MENU, WC_NONE,
	0,
	_nested_dropdown_menu_widgets, lengthof(_nested_dropdown_menu_widgets)
);

/** Drop-down menu window */
struct DropdownWindow : Window {
	WindowClass parent_wnd_class; ///< Parent window class.
	WindowNumber parent_wnd_num;  ///< Parent window number.
	int parent_button;            ///< Parent widget number where the window is dropped from.
	DropDownList *list;           ///< List with dropdown menu items.
	int selected_index;           ///< Index of the selected item in the list.
	byte click_delay;             ///< Timer to delay selection.
	bool drag_mode;
	bool instant_close;           ///< Close the window when the mouse button is raised.
	int scrolling;                ///< If non-zero, auto-scroll the item list (one time).
	Point position;               ///< Position of the topleft corner of the window.
	Scrollbar *vscroll;

	/**
	 * Create a dropdown menu.
	 * @param parent        Parent window.
	 * @param list          Dropdown item list.
	 * @param selected      Index of the selected item in the list.
	 * @param button        Widget of the parent window doing the dropdown.
	 * @param instant_close Close the window when the mouse button is raised.
	 * @param position      Topleft position of the dropdown menu window.
	 * @param size          Size of the dropdown menu window.
	 * @param wi_colour     Colour of the parent widget.
	 * @param scroll        Dropdown menu has a scrollbar.
	 * @param widget        Widgets of the dropdown menu window.
	 */
	DropdownWindow(Window *parent, DropDownList *list, int selected, int button, bool instant_close, const Point &position, const Dimension &size, Colours wi_colour, bool scroll) : Window()
	{
		this->position = position;

		this->CreateNestedTree(&_dropdown_desc);

		this->vscroll = this->GetScrollbar(WID_DM_SCROLL);

		uint items_width = size.width - (scroll ? NWidgetScrollbar::GetVerticalDimension().width : 0);
		NWidgetCore *nwi = this->GetWidget<NWidgetCore>(WID_DM_ITEMS);
		nwi->SetMinimalSize(items_width, size.height + 4);
		nwi->colour = wi_colour;

		nwi = this->GetWidget<NWidgetCore>(WID_DM_SCROLL);
		nwi->colour = wi_colour;

		this->GetWidget<NWidgetStacked>(WID_DM_SHOW_SCROLL)->SetDisplayedPlane(scroll ? 0 : SZSP_NONE);

		this->FinishInitNested(&_dropdown_desc, 0);
		CLRBITS(this->flags, WF_WHITE_BORDER);

		/* Total length of list */
		int list_height = 0;
		for (DropDownList::const_iterator it = list->begin(); it != list->end(); ++it) {
			DropDownListItem *item = *it;
			list_height += item->Height(items_width);
		}

		/* Capacity is the average number of items visible */
		this->vscroll->SetCapacity(size.height * (uint16)list->size() / list_height);
		this->vscroll->SetCount((uint16)list->size());

		this->parent_wnd_class = parent->window_class;
		this->parent_wnd_num   = parent->window_number;
		this->parent_button    = button;
		this->list             = list;
		this->selected_index   = selected;
		this->click_delay      = 0;
		this->drag_mode        = true;
		this->instant_close    = instant_close;
	}

	~DropdownWindow()
	{
		/* Make the dropdown "invisible", so it doesn't affect new window placement.
		 * Also mark it dirty in case the callback deals with the screen. (e.g. screenshots). */
		this->window_class = WC_INVALID;
		this->SetDirty();

		Window *w2 = FindWindowById(this->parent_wnd_class, this->parent_wnd_num);
		if (w2 != NULL) {
			Point pt = _cursor.pos;
			pt.x -= w2->left;
			pt.y -= w2->top;
			w2->OnDropdownClose(pt, this->parent_button, this->selected_index, this->instant_close);
		}
		DeleteDropDownList(this->list);
	}

	virtual Point OnInitialPosition(const WindowDesc *desc, int16 sm_width, int16 sm_height, int window_number)
	{
		return this->position;
	}

	/**
	 * Find the dropdown item under the cursor.
	 * @param value [out] Selected item, if function returns \c true.
	 * @return Cursor points to a dropdown item.
	 */
	bool GetDropDownItem(int &value)
	{
		if (GetWidgetFromPos(this, _cursor.pos.x - this->left, _cursor.pos.y - this->top) < 0) return false;

		NWidgetBase *nwi = this->GetWidget<NWidgetBase>(WID_DM_ITEMS);
		int y     = _cursor.pos.y - this->top - nwi->pos_y - 2;
		int width = nwi->current_x - 4;
		int pos   = this->vscroll->GetPosition();

		const DropDownList *list = this->list;

		for (DropDownList::const_iterator it = list->begin(); it != list->end(); ++it) {
			/* Skip items that are scrolled up */
			if (--pos >= 0) continue;

			const DropDownListItem *item = *it;
			int item_height = item->Height(width);

			if (y < item_height) {
				if (item->masked || !item->Selectable()) return false;
				value = item->result;
				return true;
			}

			y -= item_height;
		}

		return false;
	}

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

		TextColour colour = (TextColour)this->GetWidget<NWidgetCore>(widget)->colour;

		int y = r.top + 2;
		int pos = this->vscroll->GetPosition();
		for (DropDownList::const_iterator it = this->list->begin(); it != this->list->end(); ++it) {
			const DropDownListItem *item = *it;
			int item_height = item->Height(r.right - r.left + 1);

			/* Skip items that are scrolled up */
			if (--pos >= 0) continue;

			if (y + item_height < r.bottom) {
				bool selected = (this->selected_index == item->result);
				if (selected) GfxFillRect(r.left + 2, y, r.right - 1, y + item_height - 1, PC_BLACK);

				item->Draw(r.left, r.right, y, y + item_height, selected, colour);

				if (item->masked) {
					GfxFillRect(r.left + 1, y, r.right - 1, y + item_height - 1, _colour_gradient[colour][5], FILLRECT_CHECKER);
				}
			}
			y += item_height;
		}
	}

	virtual void OnClick(Point pt, int widget, int click_count)
	{
		if (widget != WID_DM_ITEMS) return;
		int item;
		if (this->GetDropDownItem(item)) {
			this->click_delay = 4;
			this->selected_index = item;
			this->SetDirty();
		}
	}

	virtual void OnTick()
	{
		if (this->scrolling != 0) {
			int pos = this->vscroll->GetPosition();

			this->vscroll->UpdatePosition(this->scrolling);
			this->scrolling = 0;

			if (pos != this->vscroll->GetPosition()) {
				this->SetDirty();
			}
		}
	}

	virtual void OnMouseLoop()
	{
		Window *w2 = FindWindowById(this->parent_wnd_class, this->parent_wnd_num);
		if (w2 == NULL) {
			delete this;
			return;
		}

		if (this->click_delay != 0 && --this->click_delay == 0) {
			/* Make the dropdown "invisible", so it doesn't affect new window placement.
			 * Also mark it dirty in case the callback deals with the screen. (e.g. screenshots). */
			this->window_class = WC_INVALID;
			this->SetDirty();

			w2->OnDropdownSelect(this->parent_button, this->selected_index);
			delete this;
			return;
		}

		if (this->drag_mode) {
			int item;

			if (!_left_button_clicked) {
				this->drag_mode = false;
				if (!this->GetDropDownItem(item)) {
					if (this->instant_close) delete this;
					return;
				}
				this->click_delay = 2;
			} else {
				if (_cursor.pos.y <= this->top + 2) {
					/* Cursor is above the list, set scroll up */
					this->scrolling = -1;
					return;
				} else if (_cursor.pos.y >= this->top + this->height - 2) {
					/* Cursor is below list, set scroll down */
					this->scrolling = 1;
					return;
				}

				if (!this->GetDropDownItem(item)) return;
			}

			if (this->selected_index != item) {
				this->selected_index = item;
				this->SetDirty();
			}
		}
	}
};

/**
 * Show a drop down list.
 * @param w        Parent window for the list.
 * @param list     Prepopulated DropDownList. Will be deleted when the list is
 *                 closed.
 * @param selected The initially selected list item.
 * @param button   The widget which is passed to Window::OnDropdownSelect and OnDropdownClose.
 *                 Unless you override those functions, this should be then widget index of the dropdown button.
 * @param wi_rect  Coord of the parent drop down button, used to position the dropdown menu.
 * @param auto_width The width is determined by the widest item in the list,
 *                   in this case only one of \a left or \a right is used (depending on text direction).
 * @param instant_close Set to true if releasing mouse button should close the
 *                      list regardless of where the cursor is.
 */
void ShowDropDownListAt(Window *w, DropDownList *list, int selected, int button, Rect wi_rect, Colours wi_colour, bool auto_width, bool instant_close)
{
	DeleteWindowById(WC_DROPDOWN_MENU, 0);

	/* The preferred position is just below the dropdown calling widget */
	int top = w->top + wi_rect.bottom + 1;

	/* The preferred width equals the calling widget */
	uint width = wi_rect.right - wi_rect.left + 1;

	uint max_item_width = 0;

	if (auto_width) {
		/* Find the longest item in the list */
		for (DropDownList::const_iterator it = list->begin(); it != list->end(); ++it) {
			const DropDownListItem *item = *it;
			max_item_width = max(max_item_width, item->Width() + 5);
		}
	}

	/* Total length of list */
	int list_height = 0;

	for (DropDownList::const_iterator it = list->begin(); it != list->end(); ++it) {
		DropDownListItem *item = *it;
		list_height += item->Height(width);
	}

	/* Height of window visible */
	int height = list_height;

	/* Check if the status bar is visible, as we don't want to draw over it */
	int screen_bottom = GetMainViewBottom();
	bool scroll = false;

	/* Check if the dropdown will fully fit below the widget */
	if (top + height + 4 >= screen_bottom) {
		/* If not, check if it will fit above the widget */
		if (w->top + wi_rect.top - height > GetMainViewTop()) {
			top = w->top + wi_rect.top - height - 4;
		} else {
			/* ... and lastly if it won't, enable the scroll bar and fit the
			 * list in below the widget */
			int avg_height = list_height / (int)list->size();
			int rows = (screen_bottom - 4 - top) / avg_height;
			height = rows * avg_height;
			scroll = true;
			/* Add space for the scroll bar if we automatically determined
			 * the width of the list. */
			max_item_width += NWidgetScrollbar::GetVerticalDimension().width;
		}
	}

	if (auto_width) width = max(width, max_item_width);

	Point dw_pos = { w->left + (_current_text_dir == TD_RTL ? wi_rect.right + 1 - width : wi_rect.left), top};
	Dimension dw_size = {width, height};
	new DropdownWindow(w, list, selected, button, instant_close, dw_pos, dw_size, wi_colour, scroll);
}

/**
 * Show a drop down list.
 * @param w        Parent window for the list.
 * @param list     Prepopulated DropDownList. Will be deleted when the list is
 *                 closed.
 * @param selected The initially selected list item.
 * @param button   The widget within the parent window that is used to determine
 *                 the list's location.
 * @param width    Override the width determined by the selected widget.
 * @param auto_width Maximum width is determined by the widest item in the list.
 * @param instant_close Set to true if releasing mouse button should close the
 *                      list regardless of where the cursor is.
 */
void ShowDropDownList(Window *w, DropDownList *list, int selected, int button, uint width, bool auto_width, bool instant_close)
{
	/* Our parent's button widget is used to determine where to place the drop
	 * down list window. */
	Rect wi_rect;
	NWidgetCore *nwi = w->GetWidget<NWidgetCore>(button);
	wi_rect.left   = nwi->pos_x;
	wi_rect.right  = nwi->pos_x + nwi->current_x - 1;
	wi_rect.top    = nwi->pos_y;
	wi_rect.bottom = nwi->pos_y + nwi->current_y - 1;
	Colours wi_colour = nwi->colour;

	if ((nwi->type & WWT_MASK) == NWID_BUTTON_DROPDOWN) {
		nwi->disp_flags |= ND_DROPDOWN_ACTIVE;
	} else {
		w->LowerWidget(button);
	}
	w->SetWidgetDirty(button);

	if (width != 0) {
		if (_current_text_dir == TD_RTL) {
			wi_rect.left = wi_rect.right + 1 - width;
		} else {
			wi_rect.right = wi_rect.left + width - 1;
		}
	}

	ShowDropDownListAt(w, list, selected, button, wi_rect, wi_colour, auto_width, instant_close);
}

/**
 * Show a dropdown menu window near a widget of the parent window.
 * The result code of the items is their index in the \a strings list.
 * @param w             Parent window that wants the dropdown menu.
 * @param strings       Menu list, end with #INVALID_STRING_ID
 * @param selected      Index of initial selected item.
 * @param button        Button widget number of the parent window \a w that wants the dropdown menu.
 * @param disabled_mask Bitmask for diabled items (items with their bit set are not copied to the dropdown list).
 * @param hidden_mask   Bitmask for hidden items (items with their bit set are displayed, but not selectable in the dropdown list).
 * @param width         Width of the dropdown menu. If \c 0, use the width of parent widget \a button.
 */
void ShowDropDownMenu(Window *w, const StringID *strings, int selected, int button, uint32 disabled_mask, uint32 hidden_mask, uint width)
{
	DropDownList *list = new DropDownList();

	for (uint i = 0; strings[i] != INVALID_STRING_ID; i++) {
		if (!HasBit(hidden_mask, i)) {
			list->push_back(new DropDownListStringItem(strings[i], i, HasBit(disabled_mask, i)));
		}
	}

	/* No entries in the list? */
	if (list->size() == 0) {
		DeleteDropDownList(list);
		return;
	}

	ShowDropDownList(w, list, selected, button, width);
}

/**
 * Delete the drop-down menu from window \a pw
 * @param pw Parent window of the drop-down menu window
 * @return Parent widget number if the drop-down was found and closed, \c -1 if the window was not found.
 */
int HideDropDownMenu(Window *pw)
{
	Window *w;
	FOR_ALL_WINDOWS_FROM_BACK(w) {
		if (w->window_class != WC_DROPDOWN_MENU) continue;

		DropdownWindow *dw = dynamic_cast<DropdownWindow*>(w);
		if (pw->window_class == dw->parent_wnd_class &&
				pw->window_number == dw->parent_wnd_num) {
			int parent_button = dw->parent_button;
			delete dw;
			return parent_button;
		}
	}

	return -1;
}