diff -r 136d8764c7e6 -r 1111b4d36e35 src/widget.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/widget.cpp	Wed Jan 10 18:12:09 2007 +0000
@@ -0,0 +1,700 @@
+/* $Id$ */
+
+#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)
+{
+	uint index;
+	int found_index = -1;
+
+	// Go through the widgets and check if we find the widget that the coordinate is
+	// inside.
+	for (index = 0; index < w->widget_count; index++) {
+		const Widget *wi = &w->widget[index];
+		if (wi->type == WWT_EMPTY || wi->type == WWT_FRAME) continue;
+
+		if (x >= wi->left && x <= wi->right && y >= wi->top &&  y <= wi->bottom &&
+				!IsWindowWidgetHidden(w, 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 DrawPixelInfo* dpi = _cur_dpi;
+	Rect r;
+	uint i;
+
+	for (i = 0; i < w->widget_count; i++) {
+		const Widget *wi = &w->widget[i];
+		bool clicked = IsWindowWidgetLowered(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) ||
+				IsWindowWidgetHidden(w, i)) {
+			continue;
+		}
+
+		switch (wi->type & WWT_MASK) {
+		case WWT_IMGBTN:
+		case WWT_IMGBTN_2: {
+			int img = wi->data;
+			assert(img != 0);
+			DrawFrameRect(r.left, r.top, r.right, r.bottom, wi->color, (clicked) ? FR_LOWERED : 0);
+
+			/* show different image when clicked for WWT_IMGBTN_2 */
+			if ((wi->type & WWT_MASK) == WWT_IMGBTN_2 && clicked) img++;
+			DrawSprite(img, r.left + 1 + clicked, r.top + 1 + clicked);
+			goto draw_default;
+		}
+
+		case WWT_PANEL: {
+			assert(wi->data == 0);
+			DrawFrameRect(r.left, r.top, r.right, r.bottom, wi->color, (clicked) ? FR_LOWERED : 0);
+			goto draw_default;
+		}
+
+		case WWT_TEXTBTN:
+		case WWT_TEXTBTN_2: {
+			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_TEXTBTN_2 && clicked) str++;
+
+			DrawStringCentered(((r.left + r.right + 1) >> 1) + clicked, ((r.top + r.bottom + 1) >> 1) - 5 + clicked, str, 0);
+			goto draw_default;
+		}
+
+		case WWT_INSET: {
+			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]);
+			}
+
+			DrawStringCenteredTruncated(r.left + 2, r.right - 2, r.top+2, wi->data, 0x84);
+draw_default:;
+			if (IsWindowWidgetDisabled(w, i)) {
+				GfxFillRect(r.left+1, r.top+1, r.right-1, r.bottom-1, _colour_gradient[wi->color&0xF][2] | PALETTE_MODIFIER_GREYOUT);
+			}
+		}
+		}
+	}
+
+
+	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_PANEL,   RESIZE_NONE,     0,     0, 0,     0, 0, 0x0, STR_NULL},
+{  WWT_SCROLLBAR,   RESIZE_NONE,     0,     0, 0,     0, 0, 0x0, STR_0190_SCROLL_BAR_SCROLLS_LIST},
+{   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 + w->vscroll.pos * 10;
+
+	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;
+			int width, height;
+
+			DrawWindowWidgets(w);
+
+			x = 1;
+			y = 2 - w->vscroll.pos * 10;
+
+			sel    = WP(w,dropdown_d).selected_index;
+			width  = w->widget[0].right - 3;
+			height = w->widget[0].bottom - 3;
+
+			for (i = 0; WP(w,dropdown_d).items[i] != INVALID_STRING_ID; i++, sel--) {
+				if (HASBIT(WP(w,dropdown_d).hidden_state, i)) continue;
+
+				if (y >= 0 && y <= height) {
+					if (WP(w,dropdown_d).items[i] != STR_NULL) {
+						if (sel == 0) GfxFillRect(x + 1, y, x + width, y + 9, 0);
+						DrawStringTruncated(x + 2, y, WP(w,dropdown_d).items[i], sel == 0 ? 12 : 16, x + width);
+
+						if (HASBIT(WP(w,dropdown_d).disabled_state, i)) {
+							GfxFillRect(x, y, x + width, 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;
+			}
+		} break;
+
+		case WE_CLICK: {
+			if (e->we.click.widget != 0) break;
+			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)
+{
+	int i;
+	const Widget *wi;
+	Window *w2;
+	const Window *w3;
+	bool is_dropdown_menu_shown = IsWindowWidgetLowered(w, button);
+	int top, height;
+	int screen_top, screen_bottom;
+	bool scroll = false;
+
+	DeleteWindowById(WC_DROPDOWN_MENU, 0);
+
+	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--;
+		}
+	}
+
+	/* The preferred position is just below the dropdown calling widget */
+	top = w->top + wi->bottom + 2;
+	height = i * 10 + 4;
+
+	w3 = FindWindowById(WC_STATUS_BAR, 0);
+	screen_bottom = w3 == NULL ? _screen.height : w3->top;
+
+	/* Check if the dropdown will fully fit below the widget */
+	if (top + height >= screen_bottom) {
+		w3 = FindWindowById(WC_MAIN_TOOLBAR, 0);
+		screen_top = w3 == NULL ? 0 : w3->top + w3->height;
+
+		/* If not, check if it will fit above the widget */
+		if (w->top + wi->top - height - 1 > screen_top) {
+			top = w->top + wi->top - height - 1;
+		} else {
+			/* ... and lastly if it won't, enable the scroll bar and fit the
+			 * list in below the widget */
+			int rows = (screen_bottom - 4 - top) / 10;
+			height = rows * 10 + 4;
+			scroll = true;
+		}
+	}
+
+	w2 = AllocateWindow(
+		w->left + wi[-1].left + 1,
+		top,
+		wi->right - wi[-1].left + 1,
+		height,
+		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 = height - 1;
+
+	SetWindowWidgetHiddenState(w2, 1, !scroll);
+
+	if (scroll) {
+		/* We're scrolling, so enable the scroll bar and shrink the list by
+		 * the scrollbar's width */
+		w2->widget[1].color  = wi->color;
+		w2->widget[1].right  = w2->widget[0].right;
+		w2->widget[1].left   = w2->widget[1].right - 11;
+		w2->widget[1].bottom = height - 1;
+		w2->widget[0].right -= 12;
+
+		w2->vscroll.cap   = (height - 4) / 10;
+		w2->vscroll.count = i;
+	}
+
+	w2->desc_flags = WDF_DEF_WIDGET;
+	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;
+}