widget.c
author bjarni
Thu, 05 Oct 2006 12:59:28 +0000
changeset 4739 e626ef1b522e
parent 4719 fc6e14219f72
child 4749 65a49cfc922d
permissions -rw-r--r--
(svn r6651) -Coding feature: added the windowevent WE_INVALIDATE_DATA
This gives the ability to invalidate some window data and recalculate as needed instead of doing it for each WE_PAINT

This event is called right away when using InvalidateWindowData(), so it may be a good idea to set a bool or similar in the window
or similar and then act on that bool in WE_PAINT instead of doing a lot of stuff in WE_INVALIDATE_DATA as it might be called more than once before WE_PAINT is called

InvalidateWindowData() will not automatically repaint the window, so if you want to repaint it as well, you need to mark it dirty as well.

Made the depot windows use WE_INVALIDATE_DATA to set when to generate the engine and wagon lists instead of at each redraw
It makes no sense to regenerate the list when say using the scrollbar if we know that no vehicle have entered or left the list

NOTE: currently there is a piece of code to generate the list when it's not needed and compare it to the stored list and assert if they mismatch
This check is somewhat slow and kills the whole idea of WE_INVALIDATE_DATA, so it's a short lived one to verify that InvalidateWindowData() is used everywhere where it's needed
/* $Id$ */

#include "stdafx.h"
#include "openttd.h"
#include "functions.h"
#include "player.h"
#include "table/sprites.h"
#include "table/strings.h"
#include "window.h"
#include "gfx.h"
#include "viewport.h"

static Point HandleScrollbarHittest(const Scrollbar *sb, int top, int bottom)
{
	Point pt;
	int height, count, pos, cap;

	top += 10;
	bottom -= 9;

	height = (bottom - top);

	pos = sb->pos;
	count = sb->count;
	cap = sb->cap;

	if (count != 0) top += height * pos / count;

	if (cap > count) cap = count;
	if (count != 0) bottom -= (count - pos - cap) * height / count;

	pt.x = top;
	pt.y = bottom - 1;
	return pt;
}

/*****************************************************
 * Special handling for the scrollbar widget type.
 * Handles the special scrolling buttons and other
 * scrolling.
 * Parameters:
 *   w   - Window.
 *   wi  - Pointer to the scrollbar widget.
 *   x   - The X coordinate of the mouse click.
 *   y   - The Y coordinate of the mouse click.
 */

void ScrollbarClickHandler(Window *w, const Widget *wi, int x, int y)
{
	int mi, ma, pos;
	Scrollbar *sb;

	switch (wi->type) {
		case WWT_SCROLLBAR: {
			// vertical scroller
			w->flags4 &= ~WF_HSCROLL;
			w->flags4 &= ~WF_SCROLL2;
			mi = wi->top;
			ma = wi->bottom;
			pos = y;
			sb = &w->vscroll;
			break;
		}
		case WWT_SCROLL2BAR: {
			// 2nd vertical scroller
			w->flags4 &= ~WF_HSCROLL;
			w->flags4 |= WF_SCROLL2;
			mi = wi->top;
			ma = wi->bottom;
			pos = y;
			sb = &w->vscroll2;
			break;
		}
		case  WWT_HSCROLLBAR: {
			// horizontal scroller
			w->flags4 &= ~WF_SCROLL2;
			w->flags4 |= WF_HSCROLL;
			mi = wi->left;
			ma = wi->right;
			pos = x;
			sb = &w->hscroll;
			break;
		}
		default: return; //this should never happen
	}
	if (pos <= mi+9) {
		// Pressing the upper button?
		w->flags4 |= WF_SCROLL_UP;
		if (_scroller_click_timeout == 0) {
			_scroller_click_timeout = 6;
			if (sb->pos != 0) sb->pos--;
		}
		_left_button_clicked = false;
	} else if (pos >= ma-10) {
		// Pressing the lower button?
		w->flags4 |= WF_SCROLL_DOWN;

		if (_scroller_click_timeout == 0) {
			_scroller_click_timeout = 6;
			if ((byte)(sb->pos + sb->cap) < sb->count)
				sb->pos++;
		}
		_left_button_clicked = false;
	} else {
		//
		Point pt = HandleScrollbarHittest(sb, mi, ma);

		if (pos < pt.x) {
			sb->pos = max(sb->pos - sb->cap, 0);
		} else if (pos > pt.y) {
			sb->pos = min(
				sb->pos + sb->cap,
				max(sb->count - sb->cap, 0)
			);
		} else {
			_scrollbar_start_pos = pt.x - mi - 9;
			_scrollbar_size = ma - mi - 23;
			w->flags4 |= WF_SCROLL_MIDDLE;
			_scrolling_scrollbar = true;
			_cursorpos_drag_start = _cursor.pos;
		}
	}

	SetWindowDirty(w);
}

/** Returns the index for the widget located at the given position
 * relative to the window. It includes all widget-corner pixels as well.
 * @param *w Window to look inside
 * @param  x,y Window client coordinates
 * @return A widget index, or -1 if no widget was found.
 */
int GetWidgetFromPos(const Window *w, int x, int y)
{
	const Widget *wi;
	int index, found_index = -1;

	// Go through the widgets and check if we find the widget that the coordinate is
	// inside.
	for (index = 0,wi = w->widget; wi->type != WWT_LAST; index++, wi++) {
		if (wi->type == WWT_EMPTY || wi->type == WWT_FRAME) continue;

		if (x >= wi->left && x <= wi->right && y >= wi->top &&  y <= wi->bottom &&
				!HASBIT(w->hidden_state,index)) {
			found_index = index;
		}
	}

	return found_index;
}


void DrawFrameRect(int left, int top, int right, int bottom, int ctab, FrameFlags flags)
{
	uint dark         = _colour_gradient[ctab][3];
	uint medium_dark  = _colour_gradient[ctab][5];
	uint medium_light = _colour_gradient[ctab][6];
	uint light        = _colour_gradient[ctab][7];

	if (flags & FR_TRANSPARENT) {
		GfxFillRect(left, top, right, bottom, 0x322 | USE_COLORTABLE);
	} else {
		uint interior;

		if (flags & FR_LOWERED) {
			GfxFillRect(left,     top,     left,  bottom,     dark);
			GfxFillRect(left + 1, top,     right, top,        dark);
			GfxFillRect(right,    top + 1, right, bottom - 1, light);
			GfxFillRect(left + 1, bottom,  right, bottom,     light);
			interior = (flags & FR_DARKENED ? medium_dark : medium_light);
		} else {
			GfxFillRect(left,     top,    left,      bottom - 1, light);
			GfxFillRect(left + 1, top,    right - 1, top,        light);
			GfxFillRect(right,    top,    right,     bottom - 1, dark);
			GfxFillRect(left,     bottom, right,     bottom,     dark);
			interior = medium_dark;
		}
		if (!(flags & FR_BORDERONLY)) {
			GfxFillRect(left + 1, top + 1, right - 1, bottom - 1, interior);
		}
	}
}


void DrawWindowWidgets(const Window *w)
{
	const Widget *wi;
	const DrawPixelInfo* dpi = _cur_dpi;
	Rect r;
	uint32 cur_click, cur_disabled, cur_hidden;
	int i = 0;

	wi = w->widget;

	cur_click = w->click_state;
	cur_disabled = w->disabled_state;
	cur_hidden = w->hidden_state;

	do {
		bool clicked = IsWindowWidgetLowered((Window*)w, i);

		if (dpi->left > (r.right=/*w->left + */wi->right) ||
				dpi->left + dpi->width <= (r.left=wi->left/* + w->left*/) ||
				dpi->top > (r.bottom=/*w->top +*/ wi->bottom) ||
				dpi->top + dpi->height <= (r.top = /*w->top +*/ wi->top) ||
				cur_hidden & 1) {
			continue;
		}

		switch (wi->type & WWT_MASK) {
		case WWT_PANEL: /* WWT_IMGBTN */
		case WWT_PANEL_2: {
			int img = wi->data;

			DrawFrameRect(r.left, r.top, r.right, r.bottom, wi->color, (clicked) ? FR_LOWERED : 0);

			if (img != 0) { // has an image
				// show diff image when clicked
				if ((wi->type & WWT_MASK) == WWT_PANEL_2 && clicked) img++;

				DrawSprite(img, r.left + 1 + clicked, r.top + 1 + clicked);
			}
			goto draw_default;
		}

		case WWT_TEXTBTN: /* WWT_TEXTBTN */
		case WWT_4: {
			DrawFrameRect(r.left, r.top, r.right, r.bottom, wi->color, (clicked) ? FR_LOWERED : 0);
			}
		/* fall through */

		case WWT_LABEL: {
			StringID str = wi->data;

			if ((wi->type&WWT_MASK) == WWT_4 && clicked) str++;

			DrawStringCentered(((r.left + r.right + 1) >> 1) + clicked, ((r.top + r.bottom + 1) >> 1) - 5 + clicked, str, 0);
			//DrawStringCentered((r.left + r.right+1)>>1, ((r.top+r.bottom + 1)>>1) - 5, str, 0);
			goto draw_default;
		}

		case WWT_6: {
			StringID str = wi->data;
			DrawFrameRect(r.left, r.top, r.right, r.bottom, wi->color, FR_LOWERED | FR_DARKENED);

			if (str != STR_NULL) DrawStringTruncated(r.left + 2, r.top + 1, str, 0, r.right - r.left - 10);
			goto draw_default;
		}

		case WWT_MATRIX: {
			int c, d, ctr;
			int x, amt1, amt2;
			int color;

			DrawFrameRect(r.left, r.top, r.right, r.bottom, wi->color, (clicked) ? FR_LOWERED : 0);

			c = GB(wi->data, 0, 8);
			amt1 = (wi->right - wi->left + 1) / c;

			d = GB(wi->data, 8, 8);
			amt2 = (wi->bottom - wi->top + 1) / d;

			color = _colour_gradient[wi->color & 0xF][6];

			x = r.left;
			for (ctr = c; ctr > 1; ctr--) {
				x += amt1;
				GfxFillRect(x, r.top + 1, x, r.bottom - 1, color);
			}

			x = r.top;
			for (ctr = d; ctr > 1; ctr--) {
				x += amt2;
				GfxFillRect(r.left + 1, x, r.right - 1, x, color);
			}

			color = _colour_gradient[wi->color&0xF][4];

			x = r.left - 1;
			for (ctr = c; ctr > 1; ctr--) {
				x += amt1;
				GfxFillRect(x, r.top + 1, x, r.bottom - 1, color);
			}

			x = r.top - 1;
			for (ctr = d; ctr > 1; ctr--) {
				x += amt2;
				GfxFillRect(r.left+1, x, r.right-1, x, color);
			}

			goto draw_default;
		}

		// vertical scrollbar
		case WWT_SCROLLBAR: {
			Point pt;
			int c1,c2;

			assert(r.right - r.left == 11); // XXX - to ensure the same sizes are used everywhere!

			// draw up/down buttons
			clicked = !!((w->flags4 & (WF_SCROLL_UP | WF_HSCROLL | WF_SCROLL2)) == WF_SCROLL_UP);
			DrawFrameRect(r.left, r.top, r.right, r.top + 9, wi->color, (clicked) ? FR_LOWERED : 0);
			DoDrawString(UPARROW, r.left + 2 + clicked, r.top + clicked, 0x10);

			clicked = !!(((w->flags4 & (WF_SCROLL_DOWN | WF_HSCROLL | WF_SCROLL2)) == WF_SCROLL_DOWN));
			DrawFrameRect(r.left, r.bottom - 9, r.right, r.bottom, wi->color, (clicked) ? FR_LOWERED : 0);
			DoDrawString(DOWNARROW, r.left + 2 + clicked, r.bottom - 9 + clicked, 0x10);

			c1 = _colour_gradient[wi->color&0xF][3];
			c2 = _colour_gradient[wi->color&0xF][7];

			// draw "shaded" background
			GfxFillRect(r.left, r.top+10, r.right, r.bottom-10, c2);
			GfxFillRect(r.left, r.top+10, r.right, r.bottom-10, c1 | PALETTE_MODIFIER_GREYOUT);

			// draw shaded lines
			GfxFillRect(r.left+2, r.top+10, r.left+2, r.bottom-10, c1);
			GfxFillRect(r.left+3, r.top+10, r.left+3, r.bottom-10, c2);
			GfxFillRect(r.left+7, r.top+10, r.left+7, r.bottom-10, c1);
			GfxFillRect(r.left+8, r.top+10, r.left+8, r.bottom-10, c2);

			pt = HandleScrollbarHittest(&w->vscroll, r.top, r.bottom);
			DrawFrameRect(r.left, pt.x, r.right, pt.y, wi->color, (w->flags4 & (WF_SCROLL_MIDDLE | WF_HSCROLL | WF_SCROLL2)) == WF_SCROLL_MIDDLE ? FR_LOWERED : 0);
			break;
		}
		case WWT_SCROLL2BAR: {
			Point pt;
			int c1,c2;

			assert(r.right - r.left == 11); // XXX - to ensure the same sizes are used everywhere!

			// draw up/down buttons
			clicked = !!((w->flags4 & (WF_SCROLL_UP | WF_HSCROLL | WF_SCROLL2)) == (WF_SCROLL_UP | WF_SCROLL2));
			DrawFrameRect(r.left, r.top, r.right, r.top + 9, wi->color,  (clicked) ? FR_LOWERED : 0);
			DoDrawString(UPARROW, r.left + 2 + clicked, r.top + clicked, 0x10);

			clicked = !!((w->flags4 & (WF_SCROLL_DOWN | WF_HSCROLL | WF_SCROLL2)) == (WF_SCROLL_DOWN | WF_SCROLL2));
			DrawFrameRect(r.left, r.bottom - 9, r.right, r.bottom, wi->color,  (clicked) ? FR_LOWERED : 0);
			DoDrawString(DOWNARROW, r.left + 2 + clicked, r.bottom - 9 + clicked, 0x10);

			c1 = _colour_gradient[wi->color&0xF][3];
			c2 = _colour_gradient[wi->color&0xF][7];

			// draw "shaded" background
			GfxFillRect(r.left, r.top+10, r.right, r.bottom-10, c2);
			GfxFillRect(r.left, r.top+10, r.right, r.bottom-10, c1 | PALETTE_MODIFIER_GREYOUT);

			// draw shaded lines
			GfxFillRect(r.left+2, r.top+10, r.left+2, r.bottom-10, c1);
			GfxFillRect(r.left+3, r.top+10, r.left+3, r.bottom-10, c2);
			GfxFillRect(r.left+7, r.top+10, r.left+7, r.bottom-10, c1);
			GfxFillRect(r.left+8, r.top+10, r.left+8, r.bottom-10, c2);

			pt = HandleScrollbarHittest(&w->vscroll2, r.top, r.bottom);
			DrawFrameRect(r.left, pt.x, r.right, pt.y, wi->color, (w->flags4 & (WF_SCROLL_MIDDLE | WF_HSCROLL | WF_SCROLL2)) == (WF_SCROLL_MIDDLE | WF_SCROLL2) ? FR_LOWERED : 0);
			break;
		}

		// horizontal scrollbar
		case WWT_HSCROLLBAR: {
			Point pt;
			int c1,c2;

			assert(r.bottom - r.top == 11); // XXX - to ensure the same sizes are used everywhere!

			clicked = !!((w->flags4 & (WF_SCROLL_UP | WF_HSCROLL)) == (WF_SCROLL_UP | WF_HSCROLL));
			DrawFrameRect(r.left, r.top, r.left + 9, r.bottom, wi->color, (clicked) ? FR_LOWERED : 0);
			DrawSprite(SPR_ARROW_LEFT, r.left + 1 + clicked, r.top + 1 + clicked);

			clicked = !!((w->flags4 & (WF_SCROLL_DOWN | WF_HSCROLL)) == (WF_SCROLL_DOWN | WF_HSCROLL));
			DrawFrameRect(r.right-9, r.top, r.right, r.bottom, wi->color, (clicked) ? FR_LOWERED : 0);
			DrawSprite(SPR_ARROW_RIGHT, r.right - 8 + clicked, r.top + 1 + clicked);

			c1 = _colour_gradient[wi->color&0xF][3];
			c2 = _colour_gradient[wi->color&0xF][7];

			// draw "shaded" background
			GfxFillRect(r.left+10, r.top, r.right-10, r.bottom, c2);
			GfxFillRect(r.left+10, r.top, r.right-10, r.bottom, c1 | PALETTE_MODIFIER_GREYOUT);

			// draw shaded lines
			GfxFillRect(r.left+10, r.top+2, r.right-10, r.top+2, c1);
			GfxFillRect(r.left+10, r.top+3, r.right-10, r.top+3, c2);
			GfxFillRect(r.left+10, r.top+7, r.right-10, r.top+7, c1);
			GfxFillRect(r.left+10, r.top+8, r.right-10, r.top+8, c2);

			// draw actual scrollbar
			pt = HandleScrollbarHittest(&w->hscroll, r.left, r.right);
			DrawFrameRect(pt.x, r.top, pt.y, r.bottom, wi->color, (w->flags4 & (WF_SCROLL_MIDDLE | WF_HSCROLL)) == (WF_SCROLL_MIDDLE | WF_HSCROLL) ? FR_LOWERED : 0);

			break;
		}

		case WWT_FRAME: {
			int c1,c2;
			int x2 = r.left; // by default the left side is the left side of the widget

			if (wi->data != 0) x2 = DrawString(r.left + 6, r.top, wi->data, 0);

			c1 = _colour_gradient[wi->color][3];
			c2 = _colour_gradient[wi->color][7];

			//Line from upper left corner to start of text
			GfxFillRect(r.left, r.top+4, r.left+4,r.top+4, c1);
			GfxFillRect(r.left+1, r.top+5, r.left+4,r.top+5, c2);

			// Line from end of text to upper right corner
			GfxFillRect(x2, r.top+4, r.right-1,r.top+4,c1);
			GfxFillRect(x2, r.top+5, r.right-2,r.top+5,c2);

			// Line from upper left corner to bottom left corner
			GfxFillRect(r.left, r.top+5, r.left, r.bottom-1, c1);
			GfxFillRect(r.left+1, r.top+6, r.left+1, r.bottom-2, c2);

			//Line from upper right corner to bottom right corner
			GfxFillRect(r.right-1, r.top+5, r.right-1, r.bottom-2, c1);
			GfxFillRect(r.right, r.top+4, r.right, r.bottom-1, c2);

			GfxFillRect(r.left+1, r.bottom-1, r.right-1, r.bottom-1, c1);
			GfxFillRect(r.left, r.bottom, r.right, r.bottom, c2);

			goto draw_default;
		}

		case WWT_STICKYBOX: {
			assert(r.right - r.left == 11); // XXX - to ensure the same sizes are used everywhere!

			clicked = !!(w->flags4 & WF_STICKY);
			DrawFrameRect(r.left, r.top, r.right, r.bottom, wi->color, (clicked) ? FR_LOWERED : 0);
			DrawSprite((clicked) ? SPR_PIN_UP : SPR_PIN_DOWN, r.left + 2 + clicked, r.top + 3 + clicked);
			break;
		}

		case WWT_RESIZEBOX: {
			assert(r.right - r.left == 11); // XXX - to ensure the same sizes are used everywhere!

			clicked = !!(w->flags4 & WF_SIZING);
			DrawFrameRect(r.left, r.top, r.right, r.bottom, wi->color, (clicked) ? FR_LOWERED : 0);
			DrawSprite(SPR_WINDOW_RESIZE, r.left + 3 + clicked, r.top + 3 + clicked);
			break;
		}

		case WWT_CLOSEBOX: {
			assert(r.right - r.left == 10); // ensure the same sizes are used everywhere

			DrawFrameRect(r.left, r.top, r.right, r.bottom, wi->color, 0);
			DrawString(r.left + 2, r.top + 2, STR_00C5, 0);
			break;
		}

		case WWT_CAPTION: {
			assert(r.bottom - r.top == 13); // XXX - to ensure the same sizes are used everywhere!
			DrawFrameRect(r.left, r.top, r.right, r.bottom, wi->color, FR_BORDERONLY);
			DrawFrameRect(r.left+1, r.top+1, r.right-1, r.bottom-1, wi->color, (w->caption_color == 0xFF) ? FR_LOWERED | FR_DARKENED : FR_LOWERED | FR_DARKENED | FR_BORDERONLY);

			if (w->caption_color != 0xFF) {
				GfxFillRect(r.left+2, r.top+2, r.right-2, r.bottom-2, _colour_gradient[_player_colors[w->caption_color]][4]);
			}

			DrawStringCentered( (r.left+r.right+1)>>1, r.top+2, wi->data, 0x84);
draw_default:;
			if (cur_disabled & 1) {
				GfxFillRect(r.left+1, r.top+1, r.right-1, r.bottom-1, _colour_gradient[wi->color&0xF][2] | PALETTE_MODIFIER_GREYOUT);
			}
		}
		}
	} while (i++, cur_click>>=1, cur_disabled>>=1, cur_hidden >>= 1, (++wi)->type != WWT_LAST);


	if (w->flags4 & WF_WHITE_BORDER_MASK) {
		//DrawFrameRect(w->left, w->top, w->left + w->width-1, w->top+w->height-1, 0xF, 0x10);
		DrawFrameRect(0, 0, w->width-1, w->height-1, 0xF, FR_BORDERONLY);
	}

}

static const Widget _dropdown_menu_widgets[] = {
{     WWT_IMGBTN,   RESIZE_NONE,     0,     0, 0,     0, 0, 0x0, STR_NULL},
{   WIDGETS_END},
};

static int GetDropdownItem(const Window *w)
{
	byte item, counter;
	int y;

	if (GetWidgetFromPos(w, _cursor.pos.x - w->left, _cursor.pos.y - w->top) < 0)
		return -1;

	y = _cursor.pos.y - w->top - 2;

	if (y < 0)
		return - 1;

	item = y / 10;
	if (item >= WP(w,dropdown_d).num_items || (HASBIT(WP(w,dropdown_d).disabled_state, item) && !HASBIT(WP(w,dropdown_d).hidden_state, item)) || WP(w,dropdown_d).items[item] == 0)
		return - 1;

	// Skip hidden items -- +1 for each hidden item before the clicked item.
	for (counter = 0; item >= counter; ++counter)
		if (HASBIT(WP(w,dropdown_d).hidden_state, counter)) item++;

	return item;
}

static void DropdownMenuWndProc(Window *w, WindowEvent *e)
{
	int item;

	switch (e->event) {
		case WE_PAINT: {
			int x,y,i,sel;

			DrawWindowWidgets(w);

			x = 1;
			y = 2;
			sel    = WP(w,dropdown_d).selected_index;

			for (i = 0; WP(w,dropdown_d).items[i] != INVALID_STRING_ID; i++) {
				if (HASBIT(WP(w,dropdown_d).hidden_state, i)) {
					sel--;
					continue;
				}
				if (WP(w,dropdown_d).items[i] != STR_NULL) {
					if (sel == 0) GfxFillRect(x + 1, y, x + w->width - 4, y + 9, 0);
					DrawStringTruncated(x + 2, y, WP(w,dropdown_d).items[i], sel == 0 ? 12 : 16, w->width - 4);

					if (HASBIT(WP(w,dropdown_d).disabled_state, i)) {
						GfxFillRect(x, y, x + w->width - 3, y + 9,
							PALETTE_MODIFIER_GREYOUT | _colour_gradient[_dropdown_menu_widgets[0].color][5]
						);
					}
				} else {
					int c1 = _colour_gradient[_dropdown_menu_widgets[0].color][3];
					int c2 = _colour_gradient[_dropdown_menu_widgets[0].color][7];

					GfxFillRect(x + 1, y + 3, x + w->width - 5, y + 3, c1);
					GfxFillRect(x + 1, y + 4, x + w->width - 5, y + 4, c2);
				}
				y += 10;
				sel--;
			}
		} break;

		case WE_CLICK: {
			item = GetDropdownItem(w);
			if (item >= 0) {
				WP(w,dropdown_d).click_delay = 4;
				WP(w,dropdown_d).selected_index = item;
				SetWindowDirty(w);
			}
		} break;

		case WE_MOUSELOOP: {
			Window *w2 = FindWindowById(WP(w,dropdown_d).parent_wnd_class, WP(w,dropdown_d).parent_wnd_num);
			if (w2 == NULL) {
				DeleteWindow(w);
				return;
			}

			if (WP(w,dropdown_d).click_delay != 0 && --WP(w,dropdown_d).click_delay == 0) {
				WindowEvent e;
				e.event = WE_DROPDOWN_SELECT;
				e.we.dropdown.button = WP(w,dropdown_d).parent_button;
				e.we.dropdown.index  = WP(w,dropdown_d).selected_index;
				w2->wndproc(w2, &e);
				DeleteWindow(w);
				return;
			}

			if (WP(w,dropdown_d).drag_mode) {
				item = GetDropdownItem(w);

				if (!_left_button_clicked) {
					WP(w,dropdown_d).drag_mode = false;
					if (item < 0) return;
					WP(w,dropdown_d).click_delay = 2;
				} else {
					if (item < 0) return;
				}

				WP(w,dropdown_d).selected_index = item;
				SetWindowDirty(w);
			}
		} break;

		case WE_DESTROY: {
			Window *w2 = FindWindowById(WP(w,dropdown_d).parent_wnd_class, WP(w,dropdown_d).parent_wnd_num);
			if (w2 != NULL) {
				RaiseWindowWidget(w2, WP(w,dropdown_d).parent_button);
				InvalidateWidget(w2, WP(w,dropdown_d).parent_button);
			}
		} break;
	}
}

void ShowDropDownMenu(Window *w, const StringID *strings, int selected, int button, uint32 disabled_mask, uint32 hidden_mask)
{
	WindowNumber num;
	WindowClass cls;
	int i;
	const Widget *wi;
	Window *w2;
	bool is_dropdown_menu_shown = IsWindowWidgetLowered(w, button);

	cls = w->window_class;
	num = w->window_number;
	DeleteWindowById(WC_DROPDOWN_MENU, 0);
	w = FindWindowById(cls, num);

	if (is_dropdown_menu_shown) return;

	LowerWindowWidget(w, button);

	InvalidateWidget(w, button);

	for (i = 0; strings[i] != INVALID_STRING_ID; i++) {}
	if (i == 0) return;

	wi = &w->widget[button];

	if (hidden_mask != 0) {
		uint j;

		for (j = 0; strings[j] != INVALID_STRING_ID; j++) {
			if (HASBIT(hidden_mask, j)) i--;
		}
	}

	w2 = AllocateWindow(
		w->left + wi[-1].left + 1,
		w->top + wi->bottom + 2,
		wi->right - wi[-1].left + 1,
		i * 10 + 4,
		DropdownMenuWndProc,
		WC_DROPDOWN_MENU,
		_dropdown_menu_widgets);

	w2->widget[0].color = wi->color;
	w2->widget[0].right = wi->right - wi[-1].left;
	w2->widget[0].bottom = i * 10 + 3;

	w2->flags4 &= ~WF_WHITE_BORDER_MASK;

	WP(w2,dropdown_d).disabled_state = disabled_mask;
	WP(w2,dropdown_d).hidden_state = hidden_mask;

	WP(w2,dropdown_d).parent_wnd_class = w->window_class;
	WP(w2,dropdown_d).parent_wnd_num = w->window_number;
	WP(w2,dropdown_d).parent_button = button;

	WP(w2,dropdown_d).num_items = i;
	WP(w2,dropdown_d).selected_index = selected;
	WP(w2,dropdown_d).items = strings;

	WP(w2,dropdown_d).click_delay = 0;
	WP(w2,dropdown_d).drag_mode = true;
}