第四章 布局管理

摘要： 涉及到布局管理中的一些函数

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1. void QWidget::setLayout ( QLayout * layout )

Sets the layout manager for this widget to layout.  //设置布局管理器为widget布局管理

If there already is a layout manager installed on this widget, QWidget won't let you install another. You must first delete the existing layout manager (returned by layout()) before you can call setLayout() with the new layout.

If layout is the layout manger on a different widget, setLayout() will reparent the layout and make it the layout manager for this widget.

Example:

 QVBoxLayout *layout = new QVBoxLayout; layout->addWidget(formWidget); setLayout(layout); 

An alternative to calling this function is to pass this widget to the layout's constructor.

The QWidget will take ownership of layout.

See also layout() and Layout Management.