这个类提供了安装和卸载程序包、启动一个活动以及发送键盘或触摸事件到应用程序的方法。

This class provides methods for installing and uninstalling packages, starting an Activity, and sending keyboard or touch events to an application.

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GWT为鼠标事件、键盘事件、修改事件等提供了Listener接口，还提供了几个适配器和助手类，以获得更多方便。

GWT provides Listener interfaces for mouse events, keyboard events, change events, and so forth, as well as several adapter and helper classes for added convenience.

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Visualiser支持一个选择机制，该机制可以通过鼠标或键盘操作来选择栏、类或条带。

The Visualiser supports a selection mechanism, which can be operated via the mouse or the keyboard, to select columns, classes, or stripes.

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