Method DeleteText

src/textbuf.cpp:237–266

* Delete a part of the text. * @param from Start of the text to delete. * @param to End of the text to delete. * @param update Set to true if the internal state should be updated. */

 * @param update Set to true if the internal state should be updated.
 */
void Textbuf::DeleteText(uint16_t from, uint16_t to, bool update)
{
	assert(from <= to);

	/* Strip marked characters from buffer. */
	this->chars -= static_cast<uint16_t>(Utf8StringLength(std::string_view(this->buf).substr(from, to - from)));
	this->buf.erase(from, to - from);

	auto fixup = [&](uint16_t &pos) {
		if (pos <= from) return;
		if (pos <= to) {
			pos = from;
		} else {
			pos -= to - from;
		}
	};

	/* Fixup caret if needed. */
	fixup(this->caretpos);

	/* Fixup marked text if needed. */
	fixup(this->markpos);
	fixup(this->markend);

	if (update) {
		this->UpdateStringIter();
		this->UpdateCaretPosition();
		this->UpdateMarkedText();
	}
}

/**
 * Discard any marked text.