c++ - 如何通过Qdialog中的qtablewidget填充作为MainWindow成员的qvector

Question

我使用 QT Creator 创建了 MainWindow 类。然后我将一些 pushbutton 添加到 MainWindow 以打开一个新对话框，我使用 QT Form Designer 创建了表单类。

当用户单击该按钮时，将打开一个新对话框。新对话框有一个 QTableWidget 和一个 pushbutton。用户可以用一些值填充 QTableWidget 并在单击对话框的 pushbutton 之后我想将这些值发送到 MainWindow 以填充 QVector x 和 QVector y 是 MainWindow 类的属性。

我怎样才能做到这一点？ 如何从 QDialog 获取 MainWindow 的实例？我会在函数中写什么:

void Dialog::on_pushButton_clicked() {
    // Code Here
}

提前感谢您的帮助，

彼得 在我的两个类的代码下面

#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include <QMainWindow>
#include "dialog.h"
#include <QVector>

namespace Ui {
class MainWindow;
}

class MainWindow : public QMainWindow
{
    Q_OBJECT

public:
    explicit MainWindow(QWidget *parent = nullptr);
    ~MainWindow() override;

private:
    Ui::MainWindow *ui;
    Dialog *geometria;
    QVector<double> x;
    QVector<double> y;

private slots:
 void generate();

};

#endif // MAINWINDOW_H 
////////////////////////////////////////

#include "mainwindow.h"
#include "ui_mainwindow.h"


MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
    ui->setupUi(this);
geometria=new Dialog(this);
   connect(ui->pushButton,SIGNAL(clicked()),this,SLOT(generuj_przekroj()));

}

MainWindow::~MainWindow()
{

    delete ui;

}

 void MainWindow::generate()
 {

     geometria->show();

 }

////////////////////////////////////

#ifndef DIALOG_H
#define DIALOG_H

#include <QDialog>

namespace Ui {
class Dialog;
}

class Dialog : public QDialog
{
    Q_OBJECT

public:
    explicit Dialog(QWidget *parent = nullptr);
    ~Dialog();
 public slots:
    void wcisnij();
    void  wstaw_wiersz();
    bool  eventFilter(QObject *target, QEvent *event);

private slots:
    void on_pushButton_clicked();

private:
    Ui::Dialog *ui;


};

#endif // DIALOG_H

/////////////////////////////////////////

#include "dialog.h"
#include "ui_dialog.h"
#include <QKeyEvent>
#include "xy.h"

Dialog::Dialog(QWidget *parent) :
    QDialog(parent),
    ui(new Ui::Dialog)
{
    ui->setupUi(this);
        ui->tableWidget->setRowCount(10);
        ui->tableWidget->setColumnCount(2);
        ui->tableWidget->setCurrentCell(4,1);
        ui->tableWidget->installEventFilter(this);

    connect(ui->pushButton,SIGNAL(clicked()),this,SLOT(wcisnij()));
    connect(ui->tableWidget,SIGNAL(itemSelectionChanged()),this,SLOT(wcisnij()));
    connect(ui->tableWidget,SIGNAL(itemSelectionChanged()),this,SLOT(wstaw_wiersz()));
}

Dialog::~Dialog()
{
    delete ui;
}

void Dialog::wcisnij()
{

   int r=ui->tableWidget->currentRow();
   int c=ui->tableWidget->currentColumn();
}

void  Dialog::wstaw_wiersz()
{
    int n=0;
    n=ui->tableWidget->rowCount();
    if(ui->tableWidget->currentRow()==n-1)
    ui->tableWidget->setRowCount(n+1);
}

bool  Dialog::eventFilter(QObject *target, QEvent *event) {

if (target==ui->tableWidget && event->type() == QEvent::KeyPress) {

      QKeyEvent *keyEvent = static_cast<QKeyEvent*>(event);
      if( keyEvent->key() == Qt::Key_Return|| keyEvent->key() == Qt::Key_Down )
      {
                  int n=0;
                  int k=0;
                  n=ui->tableWidget->currentRow();
                  k=ui->tableWidget->currentColumn();
                  ui->tableWidget->setCurrentCell(n+1,k);

      }

      if( keyEvent->key() == Qt::Key_Up )
      {
                  int n=0;
                  int k=0;
                  n=ui->tableWidget->currentRow();
                  k=ui->tableWidget->currentColumn();
                  ui->tableWidget->setCurrentCell(n-1,k);

      }

    return true;

}

else
     return QObject::eventFilter(target, event);

}


void Dialog::on_pushButton_clicked()
{

}

Answer 1

简短的回答是在您的对话框中加载数据，然后向 MainWindow 发出准备就绪的信号，让 MainWindow 获取数据。
添加到 Dialog.h:

public:
    std::vector<float> getX() { return x; }
    std::vector<float> getY() { return y; }

signals:
    dataReady();

private:
    QVector<double> x;
    QVector<double> y;

添加到 Dialog.cpp:

void Dialog::on_pushButton_clicked()
    for (int r=0; r<rows; ++r)
        for (int c=0; c<rows; ++c) {
            QTableWidgetItem cell = tableWidget->item(r, c);
            QString contents = cell.text();
            double val = contents.toDouble();
            x.push_back(val);
        }

    //  And do the same to collect y data

    emit dataReady();

添加到MainWindow.h

private slots:
    void onDataReady();

添加到 MainWindow.cpp

    MainWindow::MainWindow(...etc
{ ...
    geometria=new Dialog(this);

    connect(*geometria, SIGNAL(dataReady()), this, SLOT(onDataReady()));
    ...
}

        MainWindow::onDataReady()
{
    x = geometria->getX();
    y = geometria->getY();
}