Method insert_string

src/editor.rs:507–545

insert a string of characters, at the start byte indicated assumes that start points at a correct grapheme boundary record indicates whether or not to record this action in the history

(
        &mut self,
        start: usize,
        string: &str,
        record: bool,
        store_cursor: bool,
        move_cursor_after: bool,
    )

    /// assumes that start points at a correct grapheme boundary
    /// record indicates whether or not to record this action in the history
    pub fn insert_string(
        &mut self,
        start: usize,
        string: &str,
        record: bool,
        store_cursor: bool,
        move_cursor_after: bool,
    ) {
        // clear this
        self.clear_selection();

        // get the start position in chars
        let start_char = self.text.byte_to_char(start);

        // insert the text
        self.text.insert(start_char, string);

        // insert the change, if it was anything
        if record && !string.is_empty() {
            self.do_change(EditorAction::Insert(start, string.to_string()));
        }

        // fix cursor
        if self.cursor > start {
            // after the range, so move it over the right amount of bytes to compensate for the added range
            self.cursor += string.len();
        }

        // move the cursor to after the inserted text
        if move_cursor_after {
            // move it after the inserted item
            self.cursor = start + string.len();
        }

        // and recalculate the target column
        if store_cursor {
            self.target_column = self.get_cursor_column();
        }
    }

    /// remove a range of characters, in bytes, start..end
    /// assumes that the range is in correct graphemes