qt显示隐藏控件，窗口大小随之变化

#include "mainwindow.h" #include "ui_mainwindow.h" MainWindow::MainWindow(QWidget *parent) : QMainWindow(parent), ui(new Ui::MainWindow) { ui->setupUi(this); main_window=this->geometry().width(); //获取当前窗口的宽度 widget_window=ui->widget->geometry().width(); //获取widget的宽度 this->setFixedWidth(main_window-widget_window); //设置窗口的宽度 isshoweidget=false ; ui->widget->hide(); } MainWindow::~MainWindow() { delete ui; } void MainWindow::on_pushButton_clicked() { if (isshoweidget==false) { ui->widget->show(); ui->pushButton->setText("<<"); this->setFixedWidth(main_window); isshoweidget=true; } else { ui->widget->hide(); ui->pushButton->setText(">>"); this->setFixedWidth(main_window-widget_window); isshoweidget=false; } }

ui界面