在SWT中使用OLE操作Excel（一）：使Excel嵌入到SWT窗口中 - 编程入门网

Single-clicking such an object causes it to negotiate the display of its user-interface tools with its container. If the container refuses, the object remains active but without its tools displayed.

- Activates an object in place, along with its full set of user-interface tools, including menus, toolbars, and its name in the title bar of the container window.

- Used to tell objects to discard any undo state that they may be maintaining without deactivating the object.

如果光看解释看不明白的话，可以实际操作看看效果

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