Window Geometry
QWidget provides several functions that deal with a widget’s geometry. Some of these functions operate on the pure client area (i.e. the window excluding the window frame), others include the window frame. The differentiation is done in a way that covers the most common usage transparently.
Including the window frame: x(), y(), frameGeometry(), pos(), and move().
Excluding the window frame: geometry(), width(), height(), rect(), and size().
Note that the distinction only matters for decorated top-level widgets. For all child widgets, the frame geometry is equal to the widget’s client geometry.
This diagram shows most of the functions in use:
注意：frameGeometry()获得的是窗体位置，与平台相关；geometry()获得的是QWidget位置。对于frameGeometry()，需要通过QWidget::move(int x, int y)来改变窗口位置，对于geometry()，需要通过setGeometry(int x, int y, int w, int h)来改变窗口位置