可以把 QML 类型导入应用程序，使用以下 import 语句在 .qml 文件：
import QtQuick.VirtualKeyboard.Styles
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具有可调节颜色的键图标 |
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A base type of the styled keys |
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Provides a styling interface for the Virtual Keyboard |
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A base type for selection list item delegates |
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A specialized Canvas type for rendering Trace objects |
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跟踪输入键的基类型 |
