你看看这个用法能不能满足你的要求：
void QApplication::setOverrideCursor ( const QCursor & cursor ) [static]
Sets the application override cursor to cursor.
Application override cursors are intended for showing the user that the application is in a special state, for example during an operation that might take some time.
This cursor will be displayed in all the application's widgets until restoreOverrideCursor() or another setOverrideCursor() is called.
Application cursors are stored on an internal stack. setOverrideCursor() pushes the cursor onto the stack, and restoreOverrideCursor() pops the active cursor off the stack. changeOverrideCursor() changes the curently active application override cursor. Every setOverrideCursor() must eventually be followed by a corresponding restoreOverrideCursor(), otherwise the stack will never be emptied.
Example:
QApplication::setOverrideCursor(QCursor(Qt::WaitCursor));
calculateHugeMandelbrot(); // lunch time...
QApplication::restoreOverrideCursor();
See also overrideCursor(), restoreOverrideCursor(), changeOverrideCursor(), and QWidget::setCursor().
