public keydownHandler()

in packages/web-components/fast-foundation/src/listbox/listbox.ts [241:309]
54 lines of code
15 McCabe index (conditional complexity)

    public keydownHandler(e: KeyboardEvent): boolean | void {
        if (this.disabled) {
            return true;
        }

        this.shouldSkipFocus = false;

        const key = e.key;

        switch (key) {
            // Select the first available option
            case keyHome: {
                if (!e.shiftKey) {
                    e.preventDefault();
                    this.selectFirstOption();
                }
                break;
            }

            // Select the next selectable option
            case keyArrowDown: {
                if (!e.shiftKey) {
                    e.preventDefault();
                    this.selectNextOption();
                }
                break;
            }

            // Select the previous selectable option
            case keyArrowUp: {
                if (!e.shiftKey) {
                    e.preventDefault();
                    this.selectPreviousOption();
                }
                break;
            }

            // Select the last available option
            case keyEnd: {
                e.preventDefault();
                this.selectLastOption();
                break;
            }

            case keyTab: {
                this.focusAndScrollOptionIntoView();
                return true;
            }

            case keyEnter:
            case keyEscape: {
                return true;
            }

            case keySpace: {
                if (this.typeaheadExpired) {
                    return true;
                }
            }

            // Send key to Typeahead handler
            default: {
                if (key.length === 1) {
                    this.handleTypeAhead(`${key}`);
                }
                return true;
            }
        }
    }