It takes the entire width of the window, and its height is configurable.
它采用窗口的整个宽度，其高度可配置的。
Measure the full width of the window.
测量一下窗户的全宽。
The width is the same as the width of the parent window client area.
工具条的宽度与其父窗口的客户区相等。
The width is the same as the width of the parent window client area.
工具条的宽度与其父窗口的客户区相等。
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