十八、Qt 项视图类（一）QTableWidget类制作表格

C++ GUI Qt4编程中项视图类的代码

coordinatesetter.h文件

#include
#include
#include

class QPushButton;
class QTableWidget;

class CoordinateSetter : public QDialog
{
    Q_OBJECT

public:
    CoordinateSetter(QList *coords, QWidget *parent = 0);

   // void done(int result);

private slots:
    void addRow();

private:
    QTableWidget *tableWidget;
    QPushButton *addRowButton;
    QPushButton *okButton;
    QPushButton *cancelButton;
    QList *coordinates;
};

coordinatesetter.cpp文件

#include

#include "coordinatesetter.h"

CoordinateSetter::CoordinateSetter(QList *coords,
                                   QWidget *parent)
    : QDialog(parent)
{
    coordinates = coords;

    tableWidget = new QTableWidget(0, 2);
    tableWidget->setHorizontalHeaderLabels(
            QStringList() << tr("X") << tr("Y"));//设置了水平头标签

    for (int row = 0; row < coordinates->count(); ++row) {//row小于写入的值coordinates的列表数量
        QPointF point = coordinates->at(row);  //浮点数指向一行的位置
        addRow();
        tableWidget->item(row, 0)->setText(QString::number(point.x()));//将浮点数x轴写入第0列QTableWidgetItem * QTableWidget::item ( int row, int column ) const
        tableWidget->item(row, 1)->setText(QString::number(point.y()));//将浮点数y轴写入第1列。将pointx.x()转换为字符串型
    }
//QString::number 将数据转换为字符串String QString::number ( long n, int base = 10 )
    addRowButton = new QPushButton(tr("&Add Row"));

    okButton = new QPushButton(tr("OK"));
    okButton->setDefault(true);

    cancelButton = new QPushButton(tr("Cancel"));

    connect(addRowButton, SIGNAL(clicked()), this, SLOT(addRow()));
    connect(okButton, SIGNAL(clicked()), this, SLOT(accept()));
    connect(cancelButton, SIGNAL(clicked()), this, SLOT(reject()));

    QHBoxLayout *buttonLayout = new QHBoxLayout;//水平布局
    buttonLayout->addWidget(addRowButton);
    buttonLayout->addStretch();
    buttonLayout->addWidget(okButton);
    buttonLayout->addWidget(cancelButton);

    QVBoxLayout *mainLayout = new QVBoxLayout;//垂直布局
    mainLayout->addWidget(tableWidget);
    mainLayout->addLayout(buttonLayout);   //将水平布局中的控件加入到垂直布局中来
    setLayout(mainLayout);               //确定设置了以上布局

    setWindowTitle(tr("Coordinate Setter"));
}
/*
void CoordinateSetter::done(int result)
{
    if (result == QDialog::Accepted) {
        coordinates->clear();
        for (int row = 0; row < tableWidget->rowCount(); ++row) {
            double x = tableWidget->item(row, 0)->text().toDouble();
            double y = tableWidget->item(row, 1)->text().toDouble();
            coordinates->append(QPointF(x, y));
        }
    }
    QDialog::done(result);
}
*/
void CoordinateSetter::addRow() //添加行并且设置了表格中数据的位置
{
    int row = tableWidget->rowCount();//行的数量在表格中

    tableWidget->insertRow(row);  //在上面的行数下插入一个空行到表格中

    QTableWidgetItem *item0 = new QTableWidgetItem;
    item0->setTextAlignment(Qt::AlignRight | Qt::AlignVCenter);  //设置数据在表格中的位置位靠右，居中
    tableWidget->setItem(row, 0, item0);   //设置表格中每行中的第1列中的数据是按照item0设置的

    QTableWidgetItem *item1 = new QTableWidgetItem;
    item1->setTextAlignment(Qt::AlignRight | Qt::AlignVCenter);
    tableWidget->setItem(row, 1, item1);

    //tableWidget->setCurrentItem(item0);

 

main.cpp

int main(int argc, char *argv[])
{
    QApplication app(argc, argv);

    QList coordinates;
    coordinates << QPointF(0.0, 0.9)   //将QPointF设定的数值放进QList类清单里面去
                << QPointF(0.2, 11.0)
                << QPointF(0.4, 15.4)
                << QPointF(0.6, 12.9)
                << QPointF(0.8, 8.5)
                << QPointF(1.0, 7.1)
                << QPointF(1.2, 4.0)
                << QPointF(1.4, 13.6)
                << QPointF(1.6, 22.2)
                << QPointF(1.8, 22.2);
    CoordinateSetter coordinateSetter(&coordinates);
    coordinateSetter.show();

    return app.exec();
}