QTableWidget中如何显示QPushButton被点击的那一行

Question

我想删除单击 QPushButton 的行我认为使用插槽是合理的，但不知道如何操作，如果您有任何想法如何获得一行选中的按钮请分享，谢谢。

这是我的table

这是我向 QTableWidget 添加行的代码

MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
    ui->setupUi(this);
    for(int i = 0; i<20;i++)
        ui->tableWidget->insertRow(ui->tableWidget->rowCount());
    QVector<QString>vec;
    vec<<"first"<<"sec"<<"third"<<"for"<<"fif"<<"first"<<"sec"
      <<"third"<<"for"<<"fif";
    vec<<"first"<<"sec"<<"third"<<"for"<<"fif"<<"first"<<"sec"
      <<"third"<<"for"<<"fif";
    for(int i = 0; i<ui->tableWidget->rowCount();i++)
    {
        for(int j = 0; j<ui->tableWidget->columnCount();j++)
        {
            if(j == 0)
            {
                QWidget* pWidget = new QWidget();
                QPushButton* btn_edit = new QPushButton();
                btn_edit->setText("Remove");
                QHBoxLayout* pLayout = new QHBoxLayout(pWidget);
                pLayout->addWidget(btn_edit);
                pLayout->setAlignment(Qt::AlignCenter);
                pLayout->setContentsMargins(0, 0, 0, 0);
                pWidget->setLayout(pLayout);
                ui->tableWidget->setCellWidget(i, j, pWidget);
                continue;

            }
            QTableWidgetItem*item = new QTableWidgetItem(vec[i]);
            item->setFlags(item->flags() ^ Qt::ItemIsEditable);
            ui->tableWidget->setItem(i, j, item);
        }
    }
}

Answer 1

这个任务可以使用 removeRow() 方法解决，但在此之前我们必须获取行。首先，我们将所有按钮连接到循环内的一个插槽，如下所示：

*.h

private slots:
    void onClicked();

*.cpp

[...]
QPushButton* btn_edit = new QPushButton();
btn_edit->setText("Remove");
connect(btn_edit, &QPushButton::clicked, this, &MainWindow::onClicked);
[...]

在插槽中我们可以通过sender() method, then we get QWidget parent (created with the name pWidget), this is the widget that is added to the QTableWidget and its position is relative to it, then we use the method indexAt() to get the QModelIndex associated with the cell, and this has the information of the row through the method row()得到发射信号的按钮。以上所有内容都在以下几行中实现：

void MainWindow::onClicked()
{
    QWidget *w = qobject_cast<QWidget *>(sender()->parent());
    if(w){
        int row = ui->tableWidget->indexAt(w->pos()).row();
        ui->tableWidget->removeRow(row);
        ui->tableWidget->setCurrentCell(0, 0);
    }
}

注意：setCurrentCell()方法用于设置焦点，因为最后一个拥有它的单元格已被删除。

完整的例子可以在下面link.

中找到

Answer 2

创建 QPushButton 时只需添加：

    btn_delete = new QPushButton("Remove", ui->tableWidget);
    btn_delete->setObjectName(QString("%1").arg(ui->tableWidget->rowCount()));

    connect(btn_delete, SIGNAL(clicked()), this,    SLOT(CellButtonDeleteClicked()));

并创建函数 CellButtonDeleteClicked()

     void CellButtonDeleteClicked()
     {

      //   by this line I can get the sender of signal
      QPushButton *pb = qobject_cast<QPushButton *>(QObject::sender());

      int row = pb->objectName().toInt();
      ui->tableWidget->removeRow(row);
     }

QTableWidget中如何显示QPushButton被点击的那一行

How to show the row where QPushButton is clicked in QTableWidget

c++

qt

qtablewidget

qtablewidgetitem

qt5