Question

如何得到QScrollArea不带滚动条的Size

Answer 1

　　在其父类QAbstractScrollArea中有viewport成员，这就是不带滚动条的可视区域Widget 在它的resizeEvent事件中处理即可

Answer 2

int width = ui->scrollArea->widget()->visibleRegion().boundingRect().width();
int height = ui->scrollArea->widget()->visibleRegion().boundingRect().height();
// ------------------------------------------------------------------------------------
int width = ui->scrollArea->viewport()->width();
int height = ui->scrollArea->viewport()->height();