excel - 如何在QTableWidget上实现类似Excel的筛选器机制？

谁能给我一些在QTableWidget上创建过滤器机制（在Microsoft Excel中可用）的想法？

每当我单击列名时，我都希望为该表自动激活标题过滤器机制。

我在Windows上构建。



更新这是我的部分实现。但是我需要有关插槽testanother(const QString &text)的实现方面的帮助，以便在表中显示匹配的数据并隐藏不匹配的数据。

bool TableData::filterSlot() {
    int columnCount = this->tablewidget->columnCount();
    int rowCount = this->tablewidget->rowCount();
    QStringList filterList;
    QString temp_string;
    qDebug()<<"Count inside filter slot is";
    qDebug()<<rowCount<<":"<<columnCount;
    for(int c = 0; c<columnCount;c++) {
        for(int r = 0; r<rowCount;r++) {
            temp_string = this->tablewidget->item(r,c)->text();
            if(!filterList.contains(temp_string))
                filterList << temp_string;
        }
        filterList << "None";
        combo = new QComboBox(tablewidget);
        combo->addItems(filterList);
        combo->setCurrentIndex(filterList.count()-1);
        this->tablewidget->setCellWidget(0,c,combo);
        filterList.clear();
        connect(combo,SIGNAL(activated(const QString &)),
            this,SLOT(testAnother(const QString &)));
    }
    return true;
}

void TableData::testAnother(const QString &text) {
    int c = sender()->objectName().toInt();
}

最佳答案

我创建了一个从QHBoxLayout继承的列跟踪布局。它不像将小部件嵌入标题中那样好，但是至少它使小部件绑定到其各自的表列上：

演示屏幕截图



该项目托管在GitHub上的https://github.com/sashoalm/ColumnAlignedLayout。

您只需要columnalignedlayout.cpp和columnalignedlayout.h

由于它们足够小，我将直接粘贴它们。

columnalignedlayout.h

#ifndef COLUMNALIGNEDLAYOUT_H
#define COLUMNALIGNEDLAYOUT_H

#include <QHBoxLayout>

class QHeaderView;

class ColumnAlignedLayout : public QHBoxLayout
{
    Q_OBJECT
public:
    ColumnAlignedLayout();
    explicit ColumnAlignedLayout(QWidget *parent);
    void setTableColumnsToTrack(QHeaderView *view) { headerView = view; }

signals:

public slots:

private:
    void setGeometry(const QRect &r);
    QHeaderView *headerView;
};

#endif // COLUMNALIGNEDLAYOUT_H

columnalignedlayout.cpp

#include "columnalignedlayout.h"
#include <QHeaderView>

ColumnAlignedLayout::ColumnAlignedLayout()
    : QHBoxLayout()
{

}

ColumnAlignedLayout::ColumnAlignedLayout(QWidget *parent)
    : QHBoxLayout(parent)
{

}

void ColumnAlignedLayout::setGeometry(const QRect &r)
{
    QHBoxLayout::setGeometry(r);

    Q_ASSERT_X(headerView, "layout", "no table columns to track");
    if (!headerView) {
        return;
    }

    Q_ASSERT_X(headerView->count() == count(), "layout", "there must be as many items in the layout as there are columns in the table");
    if (headerView->count() != count()) {
        return;
    }

    Q_ASSERT(parentWidget());

    int widgetX = parentWidget()->mapToGlobal(QPoint(0, 0)).x();
    int headerX = headerView->mapToGlobal(QPoint(0, 0)).x();
    int delta = headerX - widgetX;

    for (int ii = 0; ii < headerView->count(); ++ii) {
        int pos = headerView->sectionViewportPosition(ii);
        int size = headerView->sectionSize(ii);

        auto item = itemAt(ii);
        auto r = item->geometry();
        r.setLeft(pos + delta);
        r.setWidth(size);
        item->setGeometry(r);
    }
}

用法示例：

alignedLayout = new ColumnAlignedLayout();
alignedLayout->addWidget(new QLineEdit(this));
alignedLayout->addWidget(new QLineEdit(this));
alignedLayout->addWidget(new QLineEdit(this));
alignedLayout->addWidget(new QLineEdit(this));
ui->widget->setLayout(alignedLayout);
alignedLayout->setTableColumnsToTrack(ui->tableWidget->horizontalHeader());
alignedLayout->setParent(ui->widget);
connect(ui->tableWidget->horizontalHeader(), SIGNAL(sectionResized(int,int,int)), SLOT(invalidateAlignedLayout()));
connect(ui->tableWidget->horizontalScrollBar(), SIGNAL(valueChanged(int)), SLOT(invalidateAlignedLayout()));

然后在插槽中调用invalidate（）：

void MainWindow::invalidateAlignedLayout()
{
    alignedLayout->invalidate();
}

关于excel - 如何在QTableWidget上实现类似Excel的筛选器机制？，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/8384309/