当重写发生时，命令处理程序的常驻程序段从磁盘再次装入暂驻存储区。
When overwrite occurs, the resident section of the command processor reloads the transient portion from disk.
在派生类中重写时，当视图的布局已更改时发生。
When overridden in a derived class, occurs when the layout of the view has been changed.
在派生类中重写时，当视图的布局已更改时发生。
When overridden in a derived class, occurs when the layout of the view has been changed.
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