1、主函数向子函数传值:
主窗口定义信号,子窗口定义槽函数,在主窗口将信号与槽连接起来
mainwindow.h:
#include<Dialog.h>signals:void sendStr(QString);private:Dialog *newDialog;mainwindow.cpp:void MainWindow::on_pushButton_clicked() //自定义按钮函数 点击传值。{QTreeWidgetItem *item = ui->treeWidget->currentItem(); //自定义treeWidgetnewDialog = new Dialog();newDialog->setModal(true); //模态QObject::connect(this,SIGNAL(sendStr(QString)),newDialog,SLOT(getStr(QString)));QString oldStr = item->text(0); //向newDialog传当前节点名字emit sendStr(oldStr);newDialog->show();}
dialog.h:
private slots:void getStr(QString);dialog.cpp:void Dialog::getStr(QString str){ui->lineEdit->setText(str); //自定义linEdit对象,将oldStr 传入dialog并显示在linEdit中。}
2、子函数向主函数传值:
规则一致。代码相似:子窗口中定义信号(emit),然后在父窗口中定义槽(),在主窗口中将槽和信号连接起来,
mainwindow.h:#include<Dialog.h>private:Dialog *newDialog;private slots:void getNewStr(QString);mainwindow.cpp:void MainWindow::getNewStr(QString newstr) //将Dialog传回的值设为treeWidget当前节点的内容{QTreeWidgetItem *item = ui->treeWidget->currentItem();item->setText(0,newStr); }void MainWindow::on_pushButton_clicked() //自定义按钮函数,点击打开newDialog{newDialog = new Dialog();newDialog->setModal(true); //模态QObject::connect(newDialog,SIGNAL(sendNewStr(QString)),this,SLOT(getNewStr(QString)));newDialog->show();}dialog.h:signals:void sendNewStr(QString);dialog.cpp:void Dialog::on_okButton_clicked() //自定义传递按钮{QString newStr = ui->lineEdit->text(); //获取lineEdit中输入的内容为newStremit sendNewStr(newStr );this->hide(); //传值后隐藏,回到MainWindow}
3、将1、2合并可以完成功能:主窗口旧名字传递给子窗口,子窗口重命名后将新名字传递给主窗口。
原文:/xrying621/article/details/80993165