public keydownHandler()

in packages/web-components/fast-foundation/src/combobox/combobox.ts [402:476]
60 lines of code
15 McCabe index (conditional complexity)

    public keydownHandler(e: Event & KeyboardEvent): boolean | void {
        const key = e.key;

        if (e.ctrlKey || e.shiftKey) {
            return true;
        }

        switch (key) {
            case "Enter": {
                this.updateValue(true);
                if (this.isAutocompleteInline) {
                    this.filter = this.value;
                }

                this.open = false;
                const controlValueLength = this.control.value.length;
                this.control.setSelectionRange(controlValueLength, controlValueLength);
                break;
            }

            case "Escape": {
                if (!this.isAutocompleteInline) {
                    this.selectedIndex = -1;
                }

                if (this.open) {
                    this.open = false;
                    break;
                }

                this.value = "";
                this.control.value = "";
                this.filter = "";
                this.filterOptions();
                break;
            }

            case "Tab": {
                this.updateValue();

                if (!this.open) {
                    return true;
                }

                e.preventDefault();
                this.open = false;
                break;
            }

            case "ArrowUp":
            case "ArrowDown": {
                this.filterOptions();

                if (!this.open) {
                    this.open = true;
                    break;
                }

                if (this.filteredOptions.length > 0) {
                    super.keydownHandler(e);
                }

                if (this.isAutocompleteInline) {
                    this.updateValue();
                    this.setInlineSelection();
                }

                break;
            }

            default: {
                return true;
            }
        }
    }