Function AddKey

src/osk_gui.cpp:228–242

* Add a key widget to a row of the keyboard. * @param hor Row container to add key widget to. * @param pad_y Vertical padding of the key (all keys in a row should have equal padding). * @param num_half Number of 1/2 key widths that this key has. * @param widtype Widget type of the key. Must be either \c NWID_SPACER for an invisible key, or a \c WWT_* widget. * @param widnum Widget numb

 * @note Key width is measured in 1/2 keys to allow for 1/2 key shifting between rows.
 */
static void AddKey(std::unique_ptr<NWidgetHorizontal> &hor, int pad_y, int num_half, WidgetType widtype, WidgetID widnum, const WidgetData &widdata)
{
	int key_width = HALF_KEY_WIDTH + (INTER_KEY_SPACE + HALF_KEY_WIDTH) * (num_half - 1);

	if (widtype == NWID_SPACER) {
		auto spc = std::make_unique<NWidgetSpacer>(key_width, 0);
		spc->SetMinimalTextLines(1, pad_y, FS_NORMAL);
		hor->Add(std::move(spc));
	} else {
		auto leaf = std::make_unique<NWidgetLeaf>(widtype, COLOUR_GREY, widnum, widdata, STR_NULL);
		leaf->SetMinimalSize(key_width, 0);
		leaf->SetMinimalTextLines(1, pad_y, FS_NORMAL);
		hor->Add(std::move(leaf));
	}
}

/** Construct the top row keys (cancel, ok, backspace). */
static std::unique_ptr<NWidgetBase> MakeTopKeys()