OpenTTD-patches/src/plans_gui.cpp

/*
 * 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 plans_gui.cpp The GUI for planning. */

#include "stdafx.h"
#include "plans_func.h"
#include "plans_base.h"
#include "command_func.h"
#include "company_func.h"
#include "company_base.h"
#include "company_gui.h"
#include "settings_gui.h"
#include "window_gui.h"
#include "window_func.h"
#include "viewport_func.h"
#include "gfx_func.h"
#include "textbuf_gui.h"
#include "tilehighlight_func.h"
#include "strings_func.h"
#include "core/pool_func.hpp"
#include "core/geometry_func.hpp"
#include "widgets/plans_widget.h"
#include "table/strings.h"
#include "table/sprites.h"

static constexpr NWidgetPart _nested_plans_widgets[] = {
	NWidget(NWID_HORIZONTAL),
		NWidget(WWT_CLOSEBOX, COLOUR_GREY),
		NWidget(WWT_CAPTION, COLOUR_GREY, WID_PLN_CAPTION), SetDataTip(STR_PLANS_CAPTION, STR_NULL),
		NWidget(WWT_SHADEBOX, COLOUR_GREY),
		NWidget(WWT_DEFSIZEBOX, COLOUR_GREY),
		NWidget(WWT_STICKYBOX, COLOUR_GREY),
	EndContainer(),

	NWidget(NWID_HORIZONTAL),
		NWidget(WWT_PANEL, COLOUR_GREY),
			NWidget(NWID_HORIZONTAL),
				NWidget(WWT_INSET, COLOUR_GREY, WID_PLN_LIST), SetFill(1, 1), SetPadding(2, 1, 2, 2), SetResize(1, 0), SetScrollbar(WID_PLN_SCROLLBAR), SetDataTip(STR_NULL, STR_PLANS_LIST_TOOLTIP),
				EndContainer(),
			EndContainer(),
		EndContainer(),
		NWidget(NWID_VSCROLLBAR, COLOUR_GREY, WID_PLN_SCROLLBAR),
	EndContainer(),

	NWidget(WWT_PANEL, COLOUR_GREY),
		NWidget(NWID_HORIZONTAL),
			NWidget(NWID_HORIZONTAL, NC_EQUALSIZE),
				NWidget(WWT_PUSHTXTBTN, COLOUR_GREY, WID_PLN_NEW), SetResize(1, 0), SetFill(1, 0), SetDataTip(STR_PLANS_NEW_PLAN, STR_PLANS_NEW_PLAN_TOOLTIP),
				NWidget(WWT_TEXTBTN_2, COLOUR_GREY, WID_PLN_ADD_LINES), SetResize(1, 0), SetFill(1, 0), SetDataTip(STR_PLANS_ADD_LINES, STR_PLANS_ADD_LINES_TOOLTIP),
				NWidget(WWT_TEXTBTN, COLOUR_GREY, WID_PLN_VISIBILITY), SetResize(1, 0), SetFill(1, 0), SetDataTip(STR_PLANS_VISIBILITY_PUBLIC, STR_PLANS_VISIBILITY_TOOLTIP),
				NWidget(WWT_DROPDOWN, COLOUR_GREY, WID_PLN_COLOUR), SetResize(1, 0), SetFill(1, 0), SetDataTip(STR_JUST_STRING, STR_PLANS_COLOUR_TOOLTIP),
				NWidget(NWID_SELECTION, INVALID_COLOUR, WID_PLN_HIDE_ALL_SEL),
					NWidget(WWT_PUSHTXTBTN, COLOUR_GREY, WID_PLN_HIDE_ALL), SetResize(1, 0), SetFill(1, 0), SetDataTip(STR_PLANS_HIDE_ALL, STR_PLANS_HIDE_ALL_TOOLTIP),
					NWidget(WWT_PUSHTXTBTN, COLOUR_GREY, WID_PLN_SHOW_ALL), SetResize(1, 0), SetFill(1, 0), SetDataTip(STR_PLANS_SHOW_ALL, STR_PLANS_SHOW_ALL_TOOLTIP),
				EndContainer(),
				NWidget(WWT_PUSHTXTBTN, COLOUR_GREY, WID_PLN_DELETE), SetResize(1, 0), SetFill(1, 0), SetDataTip(STR_PLANS_DELETE, STR_PLANS_DELETE_TOOLTIP),
				NWidget(NWID_SELECTION, INVALID_COLOUR, WID_PLN_RENAME_SEL),
					NWidget(WWT_PUSHTXTBTN, COLOUR_GREY, WID_PLN_RENAME), SetResize(1, 0), SetFill(1, 0), SetDataTip(STR_BUTTON_RENAME, STR_NULL),
					NWidget(WWT_PUSHTXTBTN, COLOUR_GREY, WID_PLN_TAKE_OWNERSHIP), SetResize(1, 0), SetFill(1, 0), SetDataTip(STR_PLANS_TAKE_OWNERSHIP, STR_PLANS_TAKE_OWNERSHIP_TOOLTIP),
				EndContainer(),
			EndContainer(),
			NWidget(WWT_RESIZEBOX, COLOUR_GREY),
		EndContainer(),
	EndContainer(),
};

static WindowDesc _plans_desc(__FILE__, __LINE__,
	WDP_AUTO, "plans", 350, 100,
	WC_PLANS, WC_NONE,
	WDF_CONSTRUCTION,
	std::begin(_nested_plans_widgets), std::end(_nested_plans_widgets)
);

struct PlansWindow : Window {
	typedef struct {
		bool is_plan;
		int plan_id;
		int line_id;
	} ListItem;

	Scrollbar *vscroll;
	NWidgetStacked *hide_all_sel;
	NWidgetStacked *rename_sel;
	std::vector<ListItem> list; ///< The translation table linking panel indices to their related PlanID.
	int selected; ///< What item is currently selected in the panel.
	uint vis_btn_left; ///< left offset of visibility button
	Dimension company_icon_spr_dim; ///< dimensions of company icon
	WindowToken current_dragging_viewport_window = 0;

	PlansWindow(WindowDesc *desc) : Window(desc)
	{
		this->CreateNestedTree();
		this->vscroll = this->GetScrollbar(WID_PLN_SCROLLBAR);
		this->hide_all_sel = this->GetWidget<NWidgetStacked>(WID_PLN_HIDE_ALL_SEL);
		this->hide_all_sel->SetDisplayedPlane(0);
		this->rename_sel = this->GetWidget<NWidgetStacked>(WID_PLN_RENAME_SEL);
		this->rename_sel->SetDisplayedPlane(0);
		this->FinishInitNested();

		this->selected = INT_MAX;
		RebuildList();
	}

	void Close(int data = 0) override
	{
		this->list.clear();
		if (_current_plan) {
			_current_plan->SetFocus(false);
			_current_plan = nullptr;
		}
		this->Window::Close();
	}

	virtual void OnClick(Point pt, WidgetID widget, int click_count) override
	{
		switch (widget) {
			case WID_PLN_NEW:
				DoCommandP(0, 0, 0, CMD_ADD_PLAN, CcAddPlan);
				break;
			case WID_PLN_ADD_LINES:
				if (_current_plan) HandlePlacePushButton(this, widget, SPR_CURSOR_MOUSE, HT_POINT | HT_MAP);
				break;
			case WID_PLN_DELETE:
				if (this->selected != INT_MAX) {
					if (this->list[this->selected].is_plan) {
						DoCommandP(0, this->list[this->selected].plan_id, 0, CMD_REMOVE_PLAN);
					} else {
						DoCommandP(0, this->list[this->selected].plan_id, this->list[this->selected].line_id, CMD_REMOVE_PLAN_LINE);
					}
				}
				break;
			case WID_PLN_HIDE_ALL: {
				for (Plan *p : Plan::Iterate()) {
					if (p->IsListable()) p->SetVisibility(false);
				}
				this->SetWidgetDirty(WID_PLN_LIST);
				break;
			}

			case WID_PLN_RENAME: {
				if (_current_plan) {
					SetDParamStr(0, _current_plan->GetName().c_str());
					ShowQueryString(STR_JUST_RAW_STRING, STR_PLANS_QUERY_RENAME_PLAN,
						MAX_LENGTH_PLAN_NAME_CHARS, this, CS_ALPHANUMERAL, QSF_LEN_IN_CHARS);
				}
				break;
			}

			case WID_PLN_TAKE_OWNERSHIP: {
				if (_current_plan != nullptr && !IsNonAdminNetworkClient()) {
					DoCommandP(0, this->list[this->selected].plan_id, 0, CMD_ACQUIRE_UNOWNED_PLAN);
				}
				break;
			}

			case WID_PLN_SHOW_ALL: {
				for (Plan *p : Plan::Iterate()) {
					if (p->IsListable()) p->SetVisibility(true);
				}
				this->SetWidgetDirty(WID_PLN_LIST);
				break;
			}
			case WID_PLN_VISIBILITY:
				if (_current_plan) _current_plan->ToggleVisibilityByAll();
				break;
			case WID_PLN_COLOUR: {
				if (_current_plan) {
					DropDownList list;
					auto add_colour = [&](Colours colour) {
						list.emplace_back(new DropDownListStringItem(STR_COLOUR_DARK_BLUE + colour, colour, false));
					};
					add_colour(COLOUR_WHITE);
					add_colour(COLOUR_YELLOW);
					add_colour(COLOUR_LIGHT_BLUE);
					add_colour(COLOUR_BLUE);
					add_colour(COLOUR_GREEN);
					add_colour(COLOUR_PURPLE);
					add_colour(COLOUR_ORANGE);
					add_colour(COLOUR_BROWN);
					add_colour(COLOUR_PINK);
					ShowDropDownList(this, std::move(list), _current_plan->colour, widget);
				}
				break;
			}
			case WID_PLN_LIST: {
				int new_selected = this->vscroll->GetScrolledRowFromWidget(pt.y, this, WID_PLN_LIST, WidgetDimensions::scaled.framerect.top);
				if (_ctrl_pressed) {
					if (new_selected != INT_MAX) {
						TileIndex t;
						if (this->list[new_selected].is_plan) {
							t = Plan::Get(this->list[new_selected].plan_id)->CalculateCentreTile();
						} else {
							t = Plan::Get(this->list[new_selected].plan_id)->lines[this->list[new_selected].line_id]->CalculateCentreTile();
						}
						if (t != INVALID_TILE) ScrollMainWindowToTile(t);
					}
					return;
				}
				if (this->selected != INT_MAX) {
					_current_plan->SetFocus(false);
				}
				if (new_selected != INT_MAX) {
					const int btn_left = this->vis_btn_left;
					const int btn_right = btn_left + SETTING_BUTTON_WIDTH;
					if (this->list[new_selected].is_plan) {
						_current_plan = Plan::Get(this->list[new_selected].plan_id);
						_current_plan->SetFocus(true);
						if (pt.x >= btn_left && pt.x < btn_right) _current_plan->ToggleVisibility();
					} else {
						_current_plan = Plan::Get(this->list[new_selected].plan_id);
						PlanLine *pl = _current_plan->lines[this->list[new_selected].line_id];
						pl->SetFocus(true);
						if (pt.x >= btn_left && pt.x < btn_right) {
							if (pl->ToggleVisibility()) _current_plan->SetVisibility(true, false);
						}
					}
					if (click_count > 1 && (pt.x < btn_left || pt.x >= btn_right)) {
						_current_plan->show_lines = !_current_plan->show_lines;
						this->InvalidateData(INVALID_PLAN);
					}
				} else {
					if (_current_plan) {
						_current_plan->SetFocus(false);
						_current_plan = nullptr;
					}
				}
				this->selected = new_selected;
				this->SetDirty();
				break;
			}
			default: break;
		}
	}

	virtual void OnDropdownSelect(WidgetID widget, int index) override
	{
		switch (widget) {
			case WID_PLN_COLOUR:
				if (_current_plan && index < COLOUR_END) {
					_current_plan->SetPlanColour((Colours)index);
				}
				break;
		}
	}

	virtual void OnQueryTextFinished(char *str) override
	{
		if (_current_plan == nullptr || str == nullptr) return;

		DoCommandP(0, _current_plan->index, 0, CMD_RENAME_PLAN | CMD_MSG(STR_ERROR_CAN_T_RENAME_PLAN), nullptr, str);
	}

	bool AllPlansHidden() const
	{
		for (Plan *p : Plan::Iterate()) {
			if (p->IsVisible()) return false;
		}
		return true;
	}

	virtual void OnPaint() override
	{
		this->SetWidgetDisabledState(WID_PLN_HIDE_ALL, this->vscroll->GetCount() == 0);
		this->SetWidgetDisabledState(WID_PLN_SHOW_ALL, this->vscroll->GetCount() == 0);
		this->hide_all_sel->SetDisplayedPlane(this->vscroll->GetCount() != 0 && this->AllPlansHidden() ? 1 : 0);
		if (_current_plan != nullptr) {
			this->SetWidgetsDisabledState(_current_plan->owner != _local_company, WID_PLN_ADD_LINES, WID_PLN_VISIBILITY, WID_PLN_DELETE, WID_PLN_RENAME, WID_PLN_COLOUR);
			this->GetWidget<NWidgetCore>(WID_PLN_VISIBILITY)->widget_data = _current_plan->visible_by_all ? STR_PLANS_VISIBILITY_PRIVATE : STR_PLANS_VISIBILITY_PUBLIC;
			this->SetWidgetDisabledState(WID_PLN_TAKE_OWNERSHIP, Company::IsValidID(_current_plan->owner) || IsNonAdminNetworkClient());
			this->rename_sel->SetDisplayedPlane(Company::IsValidID(_current_plan->owner) || !Company::IsValidID(_current_company) ? 0 : 1);
		} else {
			this->SetWidgetsDisabledState(true, WID_PLN_ADD_LINES, WID_PLN_VISIBILITY, WID_PLN_DELETE, WID_PLN_RENAME, WID_PLN_COLOUR, WID_PLN_TAKE_OWNERSHIP);
			this->rename_sel->SetDisplayedPlane(0);
		}
		this->DrawWidgets();
	}

	virtual void DrawWidget(const Rect &r, WidgetID widget) const override
	{
		switch (widget) {
			case WID_PLN_LIST: {
				Rect ir = r.Shrink(WidgetDimensions::scaled.framerect);
				uint y = ir.top; // Offset from top of widget.
				if (this->vscroll->GetCount() == 0) {
					DrawString(ir.left, ir.right, y, STR_STATION_LIST_NONE);
					return;
				}

				bool rtl = _current_text_dir == TD_RTL;
				uint icon_left  = (rtl ? ir.right - this->company_icon_spr_dim.width : r.left);
				uint btn_left   = (rtl ? icon_left - SETTING_BUTTON_WIDTH - 4 : icon_left + this->company_icon_spr_dim.width + 4);
				uint text_left  = (rtl ? ir.left : btn_left + SETTING_BUTTON_WIDTH + 4);
				uint text_right = (rtl ? btn_left - 4 : ir.right);
				const_cast<PlansWindow*>(this)->vis_btn_left = btn_left;

				for (uint16_t i = this->vscroll->GetPosition(); this->vscroll->IsVisible(i) && i < this->vscroll->GetCount(); i++) {
					Plan *p = Plan::Get(list[i].plan_id);

					if (i == this->selected) GfxFillRect(r.left + 1, y, r.right, y + this->resize.step_height, PC_DARK_GREY);

					if (list[i].is_plan) {
						if (Company::IsValidID(p->owner)) DrawCompanyIcon(p->owner, icon_left, y + (this->resize.step_height - this->company_icon_spr_dim.height) / 2);
						DrawBoolButton(btn_left, y + (this->resize.step_height - SETTING_BUTTON_HEIGHT) / 2, p->visible, true);
						uint dparam_offset = 0;
						StringID str = p->HasName() ? STR_PLANS_LIST_ITEM_NAMED_PLAN : STR_PLANS_LIST_ITEM_PLAN;
						if (!p->visible_by_all) {
							SetDParam(dparam_offset++, str);
							str = STR_PLANS_LIST_ITEM_PLAN_PRIVATE;
						}
						if (p->HasName()) {
							SetDParamStr(dparam_offset++, p->GetName().c_str());
						} else {
							SetDParam(dparam_offset++, list[i].plan_id + 1);
						}
						SetDParam(dparam_offset++, p->lines.size());
						SetDParam(dparam_offset++, p->creation_date);
						DrawString(text_left, text_right, y + (this->resize.step_height - GetCharacterHeight(FS_NORMAL)) / 2, str, TC_IS_PALETTE_COLOUR | (TextColour)_colour_value[p->colour]);
					} else {
						PlanLine *pl = p->lines[list[i].line_id];
						DrawBoolButton(btn_left, y + (this->resize.step_height - SETTING_BUTTON_HEIGHT) / 2, pl->visible, true);
						SetDParam(0, list[i].line_id + 1);
						SetDParam(1, pl->tiles.size() - 1);
						DrawString(text_left, text_right, y + (this->resize.step_height - GetCharacterHeight(FS_NORMAL)) / 2, STR_PLANS_LIST_ITEM_LINE, TC_WHITE);
					}
					y += this->resize.step_height;
				}
				break;
			}
		}
	}

	void SetStringParameters(WidgetID widget) const override
	{
		switch (widget) {
			case WID_PLN_COLOUR:
				SetDParam(0, _current_plan ? STR_COLOUR_DARK_BLUE + _current_plan->colour : STR_PLANS_COLOUR);
				break;
		}
	}

	virtual void OnResize() override
	{
		this->vscroll->SetCapacityFromWidget(this, WID_PLN_LIST, WidgetDimensions::scaled.framerect.Vertical());
	}

	virtual void UpdateWidgetSize(WidgetID widget, Dimension *size, const Dimension &padding, Dimension *fill, Dimension *resize) override
	{
		switch (widget) {
			case WID_PLN_LIST:
				this->company_icon_spr_dim = GetSpriteSize(SPR_COMPANY_ICON);
				resize->height = std::max<int>(GetCharacterHeight(FS_NORMAL), SETTING_BUTTON_HEIGHT);
				size->height = resize->height * 5 + WidgetDimensions::scaled.framerect.Vertical();
				break;

			case WID_PLN_NEW:
				*size = adddim(maxdim(GetStringBoundingBox(STR_PLANS_NEW_PLAN), GetStringBoundingBox(STR_PLANS_ADDING_LINES)), padding);
				break;

			case WID_PLN_ADD_LINES:
				*size = adddim(GetStringBoundingBox(STR_PLANS_ADD_LINES), padding);
				break;

			case WID_PLN_VISIBILITY:
				*size = adddim(maxdim(GetStringBoundingBox(STR_PLANS_VISIBILITY_PRIVATE), GetStringBoundingBox(STR_PLANS_VISIBILITY_PUBLIC)), padding);
				break;

			case WID_PLN_COLOUR: {
				Dimension dim = GetStringBoundingBox(STR_PLANS_COLOUR);
				for (uint8_t colour = COLOUR_BEGIN; colour != COLOUR_END; ++colour) {
					dim = maxdim(dim, GetStringBoundingBox(STR_COLOUR_DARK_BLUE + colour));
				}
				*size = adddim(dim, padding);
				break;
			}

			case WID_PLN_DELETE:
				*size = adddim(GetStringBoundingBox(STR_PLANS_DELETE), padding);
				break;

			case WID_PLN_RENAME:
				*size = adddim(GetStringBoundingBox(STR_BUTTON_RENAME), padding);
				break;

			case WID_PLN_TAKE_OWNERSHIP:
				*size = adddim(GetStringBoundingBox(STR_PLANS_TAKE_OWNERSHIP), padding);
				break;
		}
	}

	/** The drawing of a line starts. */
	virtual void OnPlaceObject(Point pt, TileIndex tile) override
	{
		/* A player can't add lines to a public plan of another company. */
		if (_current_plan && _current_plan->owner == _local_company) VpStartPlaceSizing(tile, VPM_X_AND_Y, DDSP_DRAW_PLANLINE);
	}

	/** The drawing of a line is in progress. */
	virtual void OnPlaceDrag(ViewportPlaceMethod select_method, ViewportDragDropSelectionProcess select_proc, Point pt) override
	{
		const Window *cursor_window = FindWindowFromPt(_cursor.pos.x, _cursor.pos.y);
		if (cursor_window == nullptr) return;

		if (this->current_dragging_viewport_window == 0) {
			this->current_dragging_viewport_window = cursor_window->GetWindowToken();
		} else if (this->current_dragging_viewport_window != cursor_window->GetWindowToken()) {
			/* Don't allow dragging across viewports as this leads to erratic plans */
			return;
		}

		const TileIndex tile = TileVirtXY(pt.x, pt.y);
		if (_current_plan && tile < MapSize()) {
			if (_ctrl_pressed && _current_plan->temp_line->tiles.empty() && _current_plan->last_tile != INVALID_TILE) {
				_current_plan->StoreTempTile(_current_plan->last_tile);
				_current_plan->last_tile = INVALID_TILE;
			}
			_current_plan->StoreTempTile(tile);
			_thd.selstart = _thd.selend;
		}
	}

	/** The drawing of a line ends up normally. */
	virtual void OnPlaceMouseUp(ViewportPlaceMethod select_method, ViewportDragDropSelectionProcess select_proc, Point pt, TileIndex start_tile, TileIndex end_tile) override
	{
		if (_current_plan) _current_plan->ValidateNewLine();
		this->current_dragging_viewport_window = 0;
	}

	/** The drawing of a line is aborted. */
	virtual void OnPlaceObjectAbort() override
	{
		if (_current_plan) {
			_current_plan->temp_line->MarkDirty();
			_current_plan->temp_line->Clear();
		}

		this->RaiseWidget(WID_PLN_ADD_LINES);
		this->SetWidgetDirty(WID_PLN_ADD_LINES);
	}

	void RebuildList()
	{
		int old_focused_plan_id = this->selected == INT_MAX ? INT_MAX : this->list[this->selected].plan_id;
		this->selected = INT_MAX;

		int sbcnt = 0;
		this->list.clear();
		for (Plan *p : Plan::Iterate()) {
			if (!p->IsListable()) continue;

			ListItem li;
			li.is_plan = true;
			li.plan_id = p->index;
			this->list.push_back(li);
			if (old_focused_plan_id == p->index) this->selected = sbcnt;
			sbcnt++;

			if (p->show_lines) {
				const int sz = (int) p->lines.size();
				sbcnt += sz;
				li.is_plan = false;
				for (int i = 0; i < sz; i++) {
					li.line_id = i;
					this->list.push_back(li);
				}
			}
		}

		if (this->selected == INT_MAX) ResetObjectToPlace();

		this->vscroll->SetCount(sbcnt);
	}

	virtual void OnInvalidateData(int data = 0, bool gui_scope = true) override
	{
		if (data != INVALID_PLAN && this->selected != INT_MAX) {
			if (this->list[this->selected].plan_id == data) {
				/* Invalidate the selection if the selected plan has been modified or deleted. */
				this->selected = INT_MAX;

				/* Cancel drawing associated to the deleted plan. */
				ResetObjectToPlace();
			}
		}

		RebuildList();
	}

	void SelectPlan(PlanID plan_index)
	{
		if (this->selected != INT_MAX) {
			if (plan_index == this->list[this->selected].plan_id) return;
			Plan::Get(this->list[this->selected].plan_id)->SetFocus(false);
		}

		if (plan_index == INVALID_PLAN) {
			this->selected = INT_MAX;
			return;
		}
		Plan::Get(plan_index)->SetFocus(true);

		for (size_t i = 0; i < this->list.size(); i++) {
			if (this->list[i].is_plan && this->list[i].plan_id == plan_index) {
				this->selected = (int) i;
				return;
			}
		}
	}
};

/** Show the window to manage plans. */
void ShowPlansWindow()
{
	if (BringWindowToFrontById(WC_PLANS, 0) != nullptr) return;
	new PlansWindow(&_plans_desc);
}

/**
 * Only the creator of a plan executes this function.
 * The other players should not be bothered with these changes.
 */
void CcAddPlan(const CommandCost &result, TileIndex tile, uint32_t p1, uint32_t p2, uint64_t p3, uint32_t cmd)
{
	if (result.Failed()) return;

	_current_plan = _new_plan;
	_current_plan->SetVisibility(true);

	Window *w = FindWindowById(WC_PLANS, 0);
	if (w != nullptr) {
		w->InvalidateData(INVALID_PLAN, false);
		((PlansWindow *) w)->SelectPlan(_current_plan->index);
		if (!w->IsWidgetLowered(WID_PLN_ADD_LINES)) {
			w->SetWidgetDisabledState(WID_PLN_ADD_LINES, false);
			HandlePlacePushButton(w, WID_PLN_ADD_LINES, SPR_CURSOR_MOUSE, HT_POINT | HT_MAP);
		}
	}
}