(svn r26885) -Feature-ish: user interface for limiting the maximum height of a map

1 files changed, 67 insertions, 21 deletions

diff --git a/src/genworld_gui.cpp b/src/genworld_gui.cpp
index 55235fb35..649ad55ff 100644
--- a/src/genworld_gui.cpp
+++ b/src/genworld_gui.cpp
@@ -84,9 +84,9 @@ static const NWidgetPart _nested_generate_landscape_widgets[] = {
 					NWidget(WWT_TEXT, COLOUR_ORANGE), SetDataTip(STR_MAPGEN_LAND_GENERATOR, STR_NULL), SetFill(1, 1),
 					NWidget(WWT_TEXT, COLOUR_ORANGE), SetDataTip(STR_MAPGEN_NUMBER_OF_TOWNS, STR_NULL), SetFill(1, 1),
 					NWidget(WWT_TEXT, COLOUR_ORANGE), SetDataTip(STR_MAPGEN_TERRAIN_TYPE, STR_NULL), SetFill(1, 1),
+					NWidget(WWT_TEXT, COLOUR_ORANGE), SetDataTip(STR_MAPGEN_VARIETY, STR_NULL), SetFill(1, 1),
 					NWidget(WWT_TEXT, COLOUR_ORANGE), SetDataTip(STR_MAPGEN_QUANTITY_OF_SEA_LAKES, STR_NULL), SetFill(1, 1),
 					NWidget(WWT_TEXT, COLOUR_ORANGE), SetDataTip(STR_MAPGEN_TREE_PLACER, STR_NULL), SetFill(1, 1),
-					NWidget(WWT_TEXT, COLOUR_ORANGE), SetDataTip(STR_MAPGEN_VARIETY, STR_NULL), SetFill(1, 1),
 					NWidget(WWT_TEXT, COLOUR_ORANGE), SetDataTip(STR_MAPGEN_BORDER_TYPE, STR_NULL), SetFill(1, 1),
 				EndContainer(),
 				/* Widgets at the right of the labels. */
@@ -100,34 +100,41 @@ static const NWidgetPart _nested_generate_landscape_widgets[] = {
 					NWidget(WWT_DROPDOWN, COLOUR_ORANGE, WID_GL_LANDSCAPE_PULLDOWN), SetDataTip(STR_JUST_STRING, STR_NULL), SetFill(1, 0),
 					NWidget(WWT_DROPDOWN, COLOUR_ORANGE, WID_GL_TOWN_PULLDOWN), SetDataTip(STR_JUST_STRING, STR_NULL), SetFill(1, 0),
 					NWidget(WWT_DROPDOWN, COLOUR_ORANGE, WID_GL_TERRAIN_PULLDOWN), SetDataTip(STR_JUST_STRING, STR_NULL), SetFill(1, 0),
+					NWidget(WWT_DROPDOWN, COLOUR_ORANGE, WID_GL_VARIETY_PULLDOWN), SetDataTip(STR_JUST_STRING, STR_NULL), SetFill(1, 0),
 					NWidget(WWT_DROPDOWN, COLOUR_ORANGE, WID_GL_WATER_PULLDOWN), SetDataTip(STR_JUST_STRING, STR_NULL), SetFill(1, 0),
 					NWidget(WWT_DROPDOWN, COLOUR_ORANGE, WID_GL_TREE_PULLDOWN), SetDataTip(STR_JUST_STRING, STR_NULL), SetFill(1, 0),
-					NWidget(WWT_DROPDOWN, COLOUR_ORANGE, WID_GL_VARIETY_PULLDOWN), SetDataTip(STR_JUST_STRING, STR_NULL), SetFill(1, 0),
 					NWidget(WWT_TEXTBTN, COLOUR_ORANGE, WID_GL_BORDERS_RANDOM), SetDataTip(STR_JUST_STRING, STR_NULL), SetFill(1, 0),
 				EndContainer(),
 			EndContainer(),
 			NWidget(NWID_VERTICAL), SetPIP(0, 4, 0),
 				NWidget(NWID_HORIZONTAL), SetPIP(0, 3, 0),
 					NWidget(NWID_VERTICAL, NC_EQUALSIZE), SetPIP(0, 4, 0),
-						NWidget(WWT_TEXT, COLOUR_ORANGE), SetDataTip(STR_MAPGEN_DATE, STR_NULL), SetFill(1, 1),
+						NWidget(WWT_TEXT, COLOUR_ORANGE), SetDataTip(STR_MAPGEN_MAX_HEIGHTLEVEL, STR_NULL), SetFill(1, 1),
 						NWidget(WWT_TEXT, COLOUR_ORANGE), SetDataTip(STR_MAPGEN_SNOW_LINE_HEIGHT, STR_NULL), SetFill(1, 1),
+						NWidget(WWT_TEXT, COLOUR_ORANGE), SetDataTip(STR_MAPGEN_DATE, STR_NULL), SetFill(1, 1),
 						NWidget(WWT_TEXT, COLOUR_ORANGE), SetDataTip(STR_MAPGEN_NUMBER_OF_INDUSTRIES, STR_NULL), SetFill(1, 1),
 						NWidget(WWT_TEXT, COLOUR_ORANGE), SetDataTip(STR_MAPGEN_SMOOTHNESS, STR_NULL), SetFill(1, 1),
 						NWidget(WWT_TEXT, COLOUR_ORANGE), SetDataTip(STR_MAPGEN_QUANTITY_OF_RIVERS, STR_NULL), SetFill(1, 1),
 					EndContainer(),
 					NWidget(NWID_VERTICAL, NC_EQUALSIZE), SetPIP(0, 4, 0),
-						/* Starting date. */
+						/* Max. heightlevel. */
 						NWidget(NWID_HORIZONTAL),
-							NWidget(WWT_IMGBTN, COLOUR_ORANGE, WID_GL_START_DATE_DOWN), SetDataTip(SPR_ARROW_DOWN, STR_SCENEDIT_TOOLBAR_TOOLTIP_MOVE_THE_STARTING_DATE_BACKWARD), SetFill(0, 1),
-							NWidget(WWT_PUSHTXTBTN, COLOUR_ORANGE, WID_GL_START_DATE_TEXT), SetDataTip(STR_BLACK_DATE_LONG, STR_NULL), SetFill(1, 0),
-							NWidget(WWT_IMGBTN, COLOUR_ORANGE, WID_GL_START_DATE_UP), SetDataTip(SPR_ARROW_UP, STR_SCENEDIT_TOOLBAR_TOOLTIP_MOVE_THE_STARTING_DATE_FORWARD), SetFill(0, 1),
+							NWidget(WWT_IMGBTN, COLOUR_ORANGE, WID_GL_MAX_HEIGHTLEVEL_DOWN), SetDataTip(SPR_ARROW_DOWN, STR_MAPGEN_MAX_HEIGHTLEVEL_DOWN), SetFill(0, 1),
+							NWidget(WWT_TEXTBTN, COLOUR_ORANGE, WID_GL_MAX_HEIGHTLEVEL_TEXT), SetDataTip(STR_BLACK_INT, STR_NULL), SetFill(1, 0),
+							NWidget(WWT_IMGBTN, COLOUR_ORANGE, WID_GL_MAX_HEIGHTLEVEL_UP), SetDataTip(SPR_ARROW_UP, STR_MAPGEN_MAX_HEIGHTLEVEL_UP), SetFill(0, 1),
 						EndContainer(),
 						/* Snow line. */
 						NWidget(NWID_HORIZONTAL),
 							NWidget(WWT_IMGBTN, COLOUR_ORANGE, WID_GL_SNOW_LEVEL_DOWN), SetDataTip(SPR_ARROW_DOWN, STR_MAPGEN_SNOW_LINE_DOWN), SetFill(0, 1),
-							NWidget(WWT_PUSHTXTBTN, COLOUR_ORANGE, WID_GL_SNOW_LEVEL_TEXT), SetDataTip(STR_BLACK_INT, STR_NULL), SetFill(1, 0),
+							NWidget(WWT_TEXTBTN, COLOUR_ORANGE, WID_GL_SNOW_LEVEL_TEXT), SetDataTip(STR_BLACK_INT, STR_NULL), SetFill(1, 0),
 							NWidget(WWT_IMGBTN, COLOUR_ORANGE, WID_GL_SNOW_LEVEL_UP), SetDataTip(SPR_ARROW_UP, STR_MAPGEN_SNOW_LINE_UP), SetFill(0, 1),
 						EndContainer(),
+						/* Starting date. */
+						NWidget(NWID_HORIZONTAL),
+							NWidget(WWT_IMGBTN, COLOUR_ORANGE, WID_GL_START_DATE_DOWN), SetDataTip(SPR_ARROW_DOWN, STR_SCENEDIT_TOOLBAR_TOOLTIP_MOVE_THE_STARTING_DATE_BACKWARD), SetFill(0, 1),
+							NWidget(WWT_PUSHTXTBTN, COLOUR_ORANGE, WID_GL_START_DATE_TEXT), SetDataTip(STR_BLACK_DATE_LONG, STR_NULL), SetFill(1, 0),
+							NWidget(WWT_IMGBTN, COLOUR_ORANGE, WID_GL_START_DATE_UP), SetDataTip(SPR_ARROW_UP, STR_SCENEDIT_TOOLBAR_TOOLTIP_MOVE_THE_STARTING_DATE_FORWARD), SetFill(0, 1),
+						EndContainer(),
 						NWidget(WWT_DROPDOWN, COLOUR_ORANGE, WID_GL_INDUSTRY_PULLDOWN), SetDataTip(STR_JUST_STRING, STR_NULL), SetFill(1, 0),
 						NWidget(WWT_DROPDOWN, COLOUR_ORANGE, WID_GL_SMOOTHNESS_PULLDOWN), SetDataTip(STR_JUST_STRING, STR_NULL), SetFill(1, 0),
 						NWidget(WWT_DROPDOWN, COLOUR_ORANGE, WID_GL_RIVER_PULLDOWN), SetDataTip(STR_JUST_STRING, STR_NULL), SetFill(1, 0),
@@ -194,11 +201,11 @@ static const NWidgetPart _nested_heightmap_load_widgets[] = {
 			NWidget(NWID_VERTICAL, NC_EQUALSIZE), SetPIP(0, 4, 0),
 				NWidget(WWT_TEXT, COLOUR_ORANGE), SetDataTip(STR_MAPGEN_HEIGHTMAP_NAME, STR_NULL), SetFill(1, 1),
 				NWidget(WWT_TEXT, COLOUR_ORANGE), SetDataTip(STR_MAPGEN_MAPSIZE, STR_NULL), SetFill(1, 1),
+				NWidget(WWT_TEXT, COLOUR_ORANGE), SetDataTip(STR_MAPGEN_HEIGHTMAP_ROTATION, STR_NULL), SetFill(1, 1),
 				NWidget(WWT_TEXT, COLOUR_ORANGE), SetDataTip(STR_MAPGEN_NUMBER_OF_TOWNS, STR_NULL), SetFill(1, 1),
 				NWidget(WWT_TEXT, COLOUR_ORANGE), SetDataTip(STR_MAPGEN_NUMBER_OF_INDUSTRIES, STR_NULL), SetFill(1, 1),
 				NWidget(WWT_TEXT, COLOUR_ORANGE), SetDataTip(STR_MAPGEN_QUANTITY_OF_RIVERS, STR_NULL), SetFill(1, 1),
 				NWidget(WWT_TEXT, COLOUR_ORANGE), SetDataTip(STR_MAPGEN_TREE_PLACER, STR_NULL), SetFill(1, 1),
-				NWidget(WWT_TEXT, COLOUR_ORANGE), SetDataTip(STR_MAPGEN_HEIGHTMAP_ROTATION, STR_NULL), SetFill(1, 1),
 			EndContainer(),
 			/* Widgets at the right of the labels. */
 			NWidget(NWID_VERTICAL), SetPIP(0, 4, 0),
@@ -211,31 +218,37 @@ static const NWidgetPart _nested_heightmap_load_widgets[] = {
 							NWidget(WWT_TEXT, COLOUR_ORANGE), SetDataTip(STR_MAPGEN_BY, STR_NULL), SetPadding(1, 0, 0, 0), SetFill(1, 1),
 							NWidget(WWT_DROPDOWN, COLOUR_ORANGE, WID_GL_MAPSIZE_Y_PULLDOWN), SetDataTip(STR_JUST_INT, STR_NULL), SetFill(1, 0),
 						EndContainer(),
+						NWidget(WWT_DROPDOWN, COLOUR_ORANGE, WID_GL_HEIGHTMAP_ROTATION_PULLDOWN), SetDataTip(STR_JUST_STRING, STR_NULL), SetFill(1, 0),
 						NWidget(WWT_DROPDOWN, COLOUR_ORANGE, WID_GL_TOWN_PULLDOWN), SetDataTip(STR_JUST_STRING, STR_NULL), SetFill(1, 0),
 						NWidget(WWT_DROPDOWN, COLOUR_ORANGE, WID_GL_INDUSTRY_PULLDOWN), SetDataTip(STR_JUST_STRING, STR_NULL), SetFill(1, 0),
 						NWidget(WWT_DROPDOWN, COLOUR_ORANGE, WID_GL_RIVER_PULLDOWN), SetDataTip(STR_JUST_STRING, STR_NULL), SetFill(1, 0),
 						NWidget(WWT_DROPDOWN, COLOUR_ORANGE, WID_GL_TREE_PULLDOWN), SetDataTip(STR_JUST_STRING, STR_NULL), SetFill(1, 0),
-						NWidget(WWT_DROPDOWN, COLOUR_ORANGE, WID_GL_HEIGHTMAP_ROTATION_PULLDOWN), SetDataTip(STR_JUST_STRING, STR_NULL), SetFill(1, 0),
 					EndContainer(),
 					NWidget(NWID_VERTICAL), SetPIP(0, 4, 0),
 						NWidget(NWID_HORIZONTAL), SetPIP(0, 3, 0),
 							NWidget(NWID_VERTICAL, NC_EQUALSIZE), SetPIP(0, 4, 0),
 								NWidget(WWT_TEXT, COLOUR_ORANGE), SetDataTip(STR_MAPGEN_HEIGHTMAP_SIZE_LABEL, STR_NULL), SetFill(1, 1),
-								NWidget(WWT_TEXT, COLOUR_ORANGE), SetDataTip(STR_MAPGEN_DATE, STR_NULL), SetFill(1, 1),
 								NWidget(WWT_TEXT, COLOUR_ORANGE), SetDataTip(STR_MAPGEN_SNOW_LINE_HEIGHT, STR_NULL), SetFill(1, 1),
+								NWidget(WWT_TEXT, COLOUR_ORANGE), SetDataTip(STR_MAPGEN_MAX_HEIGHTLEVEL, STR_NULL), SetFill(1, 1),
+								NWidget(WWT_TEXT, COLOUR_ORANGE), SetDataTip(STR_MAPGEN_DATE, STR_NULL), SetFill(1, 1),
 							EndContainer(),
 							NWidget(NWID_VERTICAL, NC_EQUALSIZE), SetPIP(0, 4, 0),
 								NWidget(WWT_TEXT, COLOUR_ORANGE, WID_GL_HEIGHTMAP_SIZE_TEXT), SetDataTip(STR_MAPGEN_HEIGHTMAP_SIZE, STR_NULL), SetFill(1, 0),
 								NWidget(NWID_HORIZONTAL),
+									NWidget(WWT_IMGBTN, COLOUR_ORANGE, WID_GL_SNOW_LEVEL_DOWN), SetDataTip(SPR_ARROW_DOWN, STR_MAPGEN_SNOW_LINE_DOWN), SetFill(0, 1),
+									NWidget(WWT_TEXTBTN, COLOUR_ORANGE, WID_GL_SNOW_LEVEL_TEXT), SetDataTip(STR_BLACK_INT, STR_NULL), SetFill(1, 0),
+									NWidget(WWT_IMGBTN, COLOUR_ORANGE, WID_GL_SNOW_LEVEL_UP), SetDataTip(SPR_ARROW_UP, STR_MAPGEN_SNOW_LINE_UP), SetFill(0, 1),
+								EndContainer(),
+								NWidget(NWID_HORIZONTAL),
+									NWidget(WWT_IMGBTN, COLOUR_ORANGE, WID_GL_MAX_HEIGHTLEVEL_DOWN), SetDataTip(SPR_ARROW_DOWN, STR_MAPGEN_MAX_HEIGHTLEVEL_DOWN), SetFill(0, 1),
+									NWidget(WWT_TEXTBTN, COLOUR_ORANGE, WID_GL_MAX_HEIGHTLEVEL_TEXT), SetDataTip(STR_BLACK_INT, STR_NULL), SetFill(1, 0),
+									NWidget(WWT_IMGBTN, COLOUR_ORANGE, WID_GL_MAX_HEIGHTLEVEL_UP), SetDataTip(SPR_ARROW_UP, STR_MAPGEN_MAX_HEIGHTLEVEL_UP), SetFill(0, 1),
+								EndContainer(),
+								NWidget(NWID_HORIZONTAL),
 									NWidget(WWT_IMGBTN, COLOUR_ORANGE, WID_GL_START_DATE_DOWN), SetDataTip(SPR_ARROW_DOWN, STR_SCENEDIT_TOOLBAR_TOOLTIP_MOVE_THE_STARTING_DATE_BACKWARD), SetFill(0, 1),
 									NWidget(WWT_PUSHTXTBTN, COLOUR_ORANGE, WID_GL_START_DATE_TEXT), SetDataTip(STR_BLACK_DATE_LONG, STR_NULL), SetFill(1, 0),
 									NWidget(WWT_IMGBTN, COLOUR_ORANGE, WID_GL_START_DATE_UP), SetDataTip(SPR_ARROW_UP, STR_SCENEDIT_TOOLBAR_TOOLTIP_MOVE_THE_STARTING_DATE_FORWARD), SetFill(0, 1),
 								EndContainer(),
-								NWidget(NWID_HORIZONTAL),
-									NWidget(WWT_IMGBTN, COLOUR_ORANGE, WID_GL_SNOW_LEVEL_DOWN), SetDataTip(SPR_ARROW_DOWN, STR_MAPGEN_SNOW_LINE_DOWN), SetFill(0, 1),
-									NWidget(WWT_PUSHTXTBTN, COLOUR_ORANGE, WID_GL_SNOW_LEVEL_TEXT), SetDataTip(STR_BLACK_INT, STR_NULL), SetFill(1, 0),
-									NWidget(WWT_IMGBTN, COLOUR_ORANGE, WID_GL_SNOW_LEVEL_UP), SetDataTip(SPR_ARROW_UP, STR_MAPGEN_SNOW_LINE_UP), SetFill(0, 1),
-								EndContainer(),
 							EndContainer(),
 						EndContainer(),
 						NWidget(NWID_SPACER), SetFill(1, 1),
@@ -324,10 +337,11 @@ struct GenerateLandscapeWindow : public Window {
 	virtual void SetStringParameters(int widget) const
 	{
 		switch (widget) {
-			case WID_GL_START_DATE_TEXT:     SetDParam(0, ConvertYMDToDate(_settings_newgame.game_creation.starting_year, 0, 1)); break;
-			case WID_GL_MAPSIZE_X_PULLDOWN:  SetDParam(0, 1 << _settings_newgame.game_creation.map_x); break;
-			case WID_GL_MAPSIZE_Y_PULLDOWN:  SetDParam(0, 1 << _settings_newgame.game_creation.map_y); break;
-			case WID_GL_SNOW_LEVEL_TEXT:     SetDParam(0, _settings_newgame.game_creation.snow_line_height); break;
+			case WID_GL_START_DATE_TEXT:      SetDParam(0, ConvertYMDToDate(_settings_newgame.game_creation.starting_year, 0, 1)); break;
+			case WID_GL_MAPSIZE_X_PULLDOWN:   SetDParam(0, 1 << _settings_newgame.game_creation.map_x); break;
+			case WID_GL_MAPSIZE_Y_PULLDOWN:   SetDParam(0, 1 << _settings_newgame.game_creation.map_y); break;
+			case WID_GL_MAX_HEIGHTLEVEL_TEXT: SetDParam(0, _settings_newgame.construction.max_heightlevel); break;
+			case WID_GL_SNOW_LEVEL_TEXT:      SetDParam(0, _settings_newgame.game_creation.snow_line_height); break;
 
 			case WID_GL_TOWN_PULLDOWN:
 				if (_game_mode == GM_EDITOR) {
@@ -413,6 +427,8 @@ struct GenerateLandscapeWindow : public Window {
 		this->SetWidgetDisabledState(WID_GL_SNOW_LEVEL_TEXT, _settings_newgame.game_creation.landscape != LT_ARCTIC);
 
 		/* Update availability of decreasing / increasing start date and snow level */
+		this->SetWidgetDisabledState(WID_GL_MAX_HEIGHTLEVEL_DOWN, _settings_newgame.construction.max_heightlevel <= MIN_MAX_HEIGHTLEVEL);
+		this->SetWidgetDisabledState(WID_GL_MAX_HEIGHTLEVEL_UP, _settings_newgame.construction.max_heightlevel >= MAX_MAX_HEIGHTLEVEL);
 		this->SetWidgetDisabledState(WID_GL_START_DATE_DOWN, _settings_newgame.game_creation.starting_year <= MIN_YEAR);
 		this->SetWidgetDisabledState(WID_GL_START_DATE_UP,   _settings_newgame.game_creation.starting_year >= MAX_YEAR);
 		this->SetWidgetDisabledState(WID_GL_SNOW_LEVEL_DOWN, _settings_newgame.game_creation.snow_line_height <= MIN_SNOWLINE_HEIGHT || _settings_newgame.game_creation.landscape != LT_ARCTIC);
@@ -430,6 +446,11 @@ struct GenerateLandscapeWindow : public Window {
 	{
 		const StringID *strs = NULL;
 		switch (widget) {
+			case WID_GL_MAX_HEIGHTLEVEL_TEXT:
+				SetDParam(0, MAX_TILE_HEIGHT);
+				*size = GetStringBoundingBox(STR_JUST_INT);
+				break;
+
 			case WID_GL_START_DATE_TEXT:
 				SetDParam(0, ConvertYMDToDate(MAX_YEAR, 0, 1));
 				*size = maxdim(*size, GetStringBoundingBox(STR_BLACK_DATE_LONG));
@@ -562,6 +583,25 @@ struct GenerateLandscapeWindow : public Window {
 				break;
 			}
 
+			case WID_GL_MAX_HEIGHTLEVEL_DOWN:
+			case WID_GL_MAX_HEIGHTLEVEL_UP: // Height level buttons
+				/* Don't allow too fast scrolling */
+				if (!(this->flags & WF_TIMEOUT) || this->timeout_timer <= 1) {
+					this->HandleButtonClick(widget);
+
+					_settings_newgame.construction.max_heightlevel = Clamp(_settings_newgame.construction.max_heightlevel + widget - WID_GL_MAX_HEIGHTLEVEL_TEXT, MIN_MAX_HEIGHTLEVEL, MAX_MAX_HEIGHTLEVEL);
+					this->InvalidateData();
+				}
+				_left_button_clicked = false;
+				break;
+
+			case WID_GL_MAX_HEIGHTLEVEL_TEXT: // Height level text
+				this->widget_id = WID_GL_MAX_HEIGHTLEVEL_TEXT;
+				SetDParam(0, _settings_newgame.construction.max_heightlevel);
+				ShowQueryString(STR_JUST_INT, STR_MAPGEN_MAX_HEIGHTLEVEL_QUERY_CAPT, 4, this, CS_NUMERAL, QSF_ENABLE_DEFAULT);
+				break;
+
+
 			case WID_GL_START_DATE_DOWN:
 			case WID_GL_START_DATE_UP: // Year buttons
 				/* Don't allow too fast scrolling */
@@ -666,7 +706,7 @@ struct GenerateLandscapeWindow : public Window {
 
 	virtual void OnTimeout()
 	{
-		static const int raise_widgets[] = {WID_GL_START_DATE_DOWN, WID_GL_START_DATE_UP, WID_GL_SNOW_LEVEL_UP, WID_GL_SNOW_LEVEL_DOWN, WIDGET_LIST_END};
+		static const int raise_widgets[] = {WID_GL_MAX_HEIGHTLEVEL_DOWN, WID_GL_MAX_HEIGHTLEVEL_UP, WID_GL_START_DATE_DOWN, WID_GL_START_DATE_UP, WID_GL_SNOW_LEVEL_UP, WID_GL_SNOW_LEVEL_DOWN, WIDGET_LIST_END};
 		for (const int *widget = raise_widgets; *widget != WIDGET_LIST_END; widget++) {
 			if (this->IsWidgetLowered(*widget)) {
 				this->RaiseWidget(*widget);
@@ -735,6 +775,7 @@ struct GenerateLandscapeWindow : public Window {
 		} else {
 			/* An empty string means revert to the default */
 			switch (this->widget_id) {
+				case WID_GL_MAX_HEIGHTLEVEL_TEXT: value = DEF_MAX_HEIGHTLEVEL; break;
 				case WID_GL_START_DATE_TEXT: value = DEF_START_YEAR; break;
 				case WID_GL_SNOW_LEVEL_TEXT: value = DEF_SNOWLINE_HEIGHT; break;
 				case WID_GL_TOWN_PULLDOWN:   value = 1; break;
@@ -744,6 +785,11 @@ struct GenerateLandscapeWindow : public Window {
 		}
 
 		switch (this->widget_id) {
+			case WID_GL_MAX_HEIGHTLEVEL_TEXT:
+				this->SetWidgetDirty(WID_GL_MAX_HEIGHTLEVEL_TEXT);
+				_settings_newgame.construction.max_heightlevel = Clamp(value, MIN_MAX_HEIGHTLEVEL, MAX_MAX_HEIGHTLEVEL);
+				break;
+
 			case WID_GL_START_DATE_TEXT:
 				this->SetWidgetDirty(WID_GL_START_DATE_TEXT);
 				_settings_newgame.game_creation.starting_year = Clamp(value, MIN_YEAR, MAX_YEAR);