Method GetCharAtPosition

src/misc_gui.cpp:851–870

* Get the character that is rendered at a position. * @param w Window the edit box is in. * @param wid Widget index. * @param pt Position to test. * @return Index of the character position or -1 if no character is at the position. */

 * @return Index of the character position or -1 if no character is at the position.
 */
ptrdiff_t QueryString::GetCharAtPosition(const Window *w, WidgetID wid, const Point &pt) const
{
	const NWidgetLeaf *wi = w->GetWidget<NWidgetLeaf>(wid);

	assert((wi->type & WWT_MASK) == WWT_EDITBOX);

	bool rtl = _current_text_dir == TD_RTL;
	Dimension sprite_size = GetScaledSpriteSize(rtl ? SPR_IMG_DELETE_RIGHT : SPR_IMG_DELETE_LEFT);
	int clearbtn_width = sprite_size.width + WidgetDimensions::scaled.imgbtn.Horizontal();

	Rect r = wi->GetCurrentRect().Indent(clearbtn_width, !rtl).Shrink(WidgetDimensions::scaled.framerect);

	if (!IsInsideMM(pt.y, r.top, r.bottom)) return -1;

	/* Clamp caret position to be inside our current width. */
	const Textbuf *tb = &this->text;
	r = ScrollEditBoxTextRect(r, *tb);

	return ::GetCharAtPosition(tb->GetText(), pt.x - r.left);
}

void QueryString::ClickEditBox(Window *w, Point pt, WidgetID wid, int click_count, bool focus_changed)
{