可以使用以下 import 语句在 .qml 文件中把 QML 类型导入应用程序：
import QtQuick.VirtualKeyboard.Components
| BackspaceKey | Backspace key for keyboard layouts |
| BaseKey | Common parent for all key types |
| ChangeLanguageKey | Change language key for keyboard layouts |
| EnterKey | Enter key for keyboard layouts |
| FillerKey | Filler key for keyboard layouts |
| FlickKey | Flick key for keyboard layouts |
| HandwritingModeKey | Hand writing mode key for keyboard layouts |
| HideKeyboardKey | Hide keyboard key for keyboard layouts |
| InputModeKey | Input mode key for keyboard layouts |
| Key | Regular character key for keyboard layouts |
| KeyboardColumn | Keyboard column for keyboard layouts |
| KeyboardLayout | Keyboard layout |
| KeyboardLayoutLoader | Allows dynamic loading of keyboard layout |
| KeyboardRow | Keyboard row for keyboard layouts |
| ModeKey | Generic mode key for keyboard layouts |
| NumberKey | Specialized number key for keyboard layouts |
| ShiftKey | Shift key for keyboard layouts |
| SpaceKey | Space key for keyboard layouts |
| SymbolModeKey | Symbol mode key for keyboard layouts |
| TraceInputArea | A specialized MultiPointTouchArea for collecting touch input data |
| TraceInputKey | A specialized key for collecting touch input data |
