Class SignListWindow

src/signs_gui.cpp:136–331

std::string SignList::default_name;

struct SignListWindow : Window, SignList {
	QueryString filter_editbox; ///< Filter editbox;
	int text_offset = 0; ///< Offset of the sign text relative to the left edge of the WID_SIL_LIST widget.
	Scrollbar *vscroll = nullptr;

	SignListWindow(WindowDesc &desc, WindowNumber window_number) : Window(desc), filter_editbox(MAX_LENGTH_SIGN_NAME_CHARS * MAX_CHAR_LENGTH, MAX_LENGTH_SIGN_NAME_CHARS)
	{
		this->CreateNestedTree();
		this->vscroll = this->GetScrollbar(WID_SIL_SCROLLBAR);
		this->FinishInitNested(window_number);
		this->SetWidgetLoweredState(WID_SIL_FILTER_MATCH_CASE_BTN, SignList::match_case);

		/* Initialize the text edit widget */
		this->querystrings[WID_SIL_FILTER_TEXT] = &this->filter_editbox;
		this->filter_editbox.cancel_button = QueryString::ACTION_CLEAR;

		/* Initialize the filtering variables */
		this->SetFilterString("");

		/* Create initial list. */
		this->signs.ForceRebuild();
		this->signs.ForceResort();
		this->BuildSortSignList();
	}

	void OnInit() override
	{
		/* Default sign name, used if Sign::name is nullptr. */
		SignList::default_name = GetString(STR_DEFAULT_SIGN_NAME);
		this->signs.ForceResort();
		this->SortSignsList();
		this->SetDirty();
	}

	/**
	 * This function sets the filter string of the sign list. The contents of
	 * the edit widget is not updated by this function. Depending on if the
	 * new string is zero-length or not the clear button is made
	 * disabled/enabled. The sign list is updated according to the new filter.
	 */
	void SetFilterString(std::string_view new_filter_string)
	{
		/* check if there is a new filter string */
		this->string_filter.SetFilterTerm(new_filter_string);

		/* Rebuild the list of signs */
		this->InvalidateData();
	}

	void OnPaint() override
	{
		if (!this->IsShaded() && this->signs.NeedRebuild()) this->BuildSortSignList();
		this->DrawWidgets();
	}

	void DrawWidget(const Rect &r, WidgetID widget) const override
	{
		switch (widget) {