Qt Table Widget常用操作

一、鼠标悬浮在item上显示提示信息

1、在构造函数开启table Widget控件的鼠标捕获功能

// 开启鼠标捕获功能(实现table widget的悬浮功能)

ui.tableWidget->setMouseTracking(true);

2、连接信号和槽

connect(ui.tableWidget, SIGNAL(    cellEntered(int, int)), this, SLOT(slotCellEntered(int, int)));

3、编写槽函数

void test10292::slotCellEntered(int r, int c)

{

    QTableWidgetItem* item = ui.tableWidget->item(r, c);

    if (item == nullptr)

    {

        return;

    }

    QToolTip::showText(QCursor::pos(), item->text());

}

二：点击表头实现排序

第二个是后实现的，按数值排序，因为Qt自带的排序是按字段排序的

// 连接信号和槽

connect(ui.tableWidget->horizontalHeader(), SIGNAL(sectionClicked(int)), this, SLOT(sortHeader(int)));

// 实现槽函数

void test10292::sortHeader(int index)

{

    if (index == )

    {

        ui.tableWidget->sortItems(index, Qt::DescendingOrder);

        return;

    }

    ui.tableWidget->sortItems(index, Qt::AscendingOrder);

}

void test10292::sortHeader(int index)

{

    if (index ==  || index == )

    {

        sortTableItem(index);

        return;

    }

    ui.tableWidget->sortItems(index, Qt::AscendingOrder);

}

// 表头排序

void test10292::sortTableItem(int index)

{

    int rowCountNum = ui.tableWidget->rowCount();

    for (int i =  rowCountNum - ; i >= ; i--)

    {

        for (int j = ; j < i; j++)

        {

            if (ui.tableWidget->item(j, index)->text().toInt() < ui.tableWidget->item(j + , index)->text().toInt())

            {

                QString str1 = ui.tableWidget->item(j + , )->text();

                QString str2 = ui.tableWidget->item(j + , )->text();

                QString str3 = ui.tableWidget->item(j + , )->text();

                ui.tableWidget->item(j + , )->setText(ui.tableWidget->item(j, )->text());

                ui.tableWidget->item(j + , )->setText(ui.tableWidget->item(j, )->text());

                ui.tableWidget->item(j + , )->setText(ui.tableWidget->item(j, )->text());

                ui.tableWidget->item(j, )->setText(str1);

                ui.tableWidget->item(j, )->setText(str2);

                ui.tableWidget->item(j, )->setText(str3);

            }

        }

    }

}

三：拖拽item 实现两个item内容的互换

需要写一个类MyQTableWidget继承自QTableWidget，然后重写mousePressEvent和dropEvent事件处理函数

MyQTableWidget.h 文件

#ifndef MYQTABLEWIDGET_H

#define MYQTABLEWIDGET_H

#include <QTableWidget>

#include <QMouseEvent>

#include <QDebug>

class MyQTableWidget : public QTableWidget

{

    Q_OBJECT

public:

    MyQTableWidget(QWidget *parent);

    ~MyQTableWidget();

private:

    QString temp;

    QPoint m_spos, m_dpos;

    QTableWidgetItem* sitem;

    QTableWidgetItem* ditem;

    void mousePressEvent(QMouseEvent *event);

    void dropEvent(QDropEvent *event);

};

#endif // MYQTABLEWIDGET_H

MyQTableWidget.cpp 文件

#include "MyQTableWidget.h"

MyQTableWidget::MyQTableWidget(QWidget *parent)

    :QTableWidget(parent)

{

    /******************** 实现表格控件拖拽item交换数据 ********************/

    this->setDragDropMode(QAbstractItemView::DragDrop);

    this->setDragEnabled(true);

    this->setAcceptDrops(true);

    //选中一个Item

    this->setSelectionBehavior(QAbstractItemView::SelectItems);

}

MyQTableWidget::~MyQTableWidget()

{

}

void MyQTableWidget::mousePressEvent(QMouseEvent *event)

{

    m_spos = event->pos();

    sitem = new QTableWidgetItem();

    sitem = QTableWidget::itemAt(m_spos);

    if (sitem == NULL)

    {

        return;

    }

    temp = sitem->text();

    QTableWidget::mousePressEvent(event);

}

void MyQTableWidget::dropEvent(QDropEvent *event)

{

    m_dpos = event->pos();

    ditem = new QTableWidgetItem();

    ditem = QTableWidget::itemAt(m_dpos);

    if (ditem == NULL)

    {

        return;

    }

    sitem->setText(ditem->text());

    ditem->setText(temp);

}

四：在 item 里面添加CheckBox控件

1、添加选择功能

QTableWidgetItem* item = new QTableWidgetItem();

item = new QTableWidgetItem();

item->setCheckState(Qt::Unchecked);

item->setText(QString::fromLocal8Bit("勾选"));

item->setBackgroundColor(QColor(0x00, 0xFF, 0x00));

ui.tableWidget->setItem(row, , item);

2、复选框选择事件处理

// 连接信号和槽

connect(ui.tableWidget, SIGNAL(cellClicked(int, int)), this, SLOT(stateChecked(int, int)));

// 实现槽函数

void test10292::stateChecked(int row, int column )

{

    if (column == )

    {

        QTableWidgetItem* item = ui.tableWidget->item(row, column);

        if (item != NULL)

        {

            if (item->checkState() == Qt::Checked)

            {

                // 选中红色

                item->setBackgroundColor(QColor(0xFF, 0x00, 0x00));

            }

            else if (item->checkState() == Qt::Unchecked)

            {

                // 没选中绿色

                item->setBackgroundColor(QColor(0x00, 0xFF, 0x00));

            }

        }

    }

}

五：插入复选框的第二种方法

QCheckBox* cb = new QCheckBox();

cb->setText(QString::fromLocal8Bit("易语言"));

ui.tableWidget->setCellWidget(row, , cb);

六：其中一个item是CheckBox控件，拖拽实现交换两个item(包括控件交换)

主要是通过 item 的关联数据来实现，插入数据的时候如果是控件关联数据设置为一个值，不是控件设置为另外一个值。然后在dropEvent()事件函数里面处理。

void test10292::AddData(const QString& id, const QString& name, int score)

{

    int row = ui.tableWidget->rowCount();

    ui.tableWidget->insertRow(row);

    // ID

    QTableWidgetItem* item = new QTableWidgetItem();

    item->setText(id);

    item->setData(Qt::ToolTip, "");

    ui.tableWidget->setItem(row, , item);

    item->setTextAlignment(Qt::AlignHCenter|Qt::AlignVCenter);

    // name

    item = new QTableWidgetItem();

    item->setText(name);

    item->setData(Qt::ToolTip, "");

    ui.tableWidget->setItem(row, , item);

    item->setTextAlignment(Qt::AlignHCenter|Qt::AlignVCenter);

    // score

    item = new QTableWidgetItem();

    item->setText(QString::number(score));

    item->setData(Qt::ToolTip, "");

    ui.tableWidget->setItem(row, , item);

    item->setTextAlignment(Qt::AlignHCenter|Qt::AlignVCenter);

    // 第四列插入复选框

    /*QCheckBox* cb = new QCheckBox();

    cb->setText(QString::fromLocal8Bit("易语言"));

    ui.tableWidget->setCellWidget(row, 3, cb);*/

    item = new QTableWidgetItem();

    item->setCheckState(Qt::Unchecked);

    item->setText(QString::fromLocal8Bit("勾选"));

    item->setBackgroundColor(QColor(0x00, 0xFF, 0x00));

    item->setData(Qt::ToolTip, "this is tooltip");

    ui.tableWidget->setItem(row, , item);

}

#include "MyQTableWidget.h"

MyQTableWidget::MyQTableWidget(QWidget *parent)

    :QTableWidget(parent)

{

    /******************** 实现表格控件拖拽item交换数据 ********************/

    this->setDragDropMode(QAbstractItemView::DragDrop);

    this->setDragEnabled(true);

    this->setAcceptDrops(true);

    //选中一个Item

    this->setSelectionBehavior(QAbstractItemView::SelectItems);

}

MyQTableWidget::~MyQTableWidget()

{

}

void MyQTableWidget::mousePressEvent(QMouseEvent *event)

{

    m_spos = event->pos();

    sitem = new QTableWidgetItem();

    sitem = QTableWidget::itemAt(m_spos);

    if (sitem == NULL)

    {

        return;

    }

    temp = sitem->text();

    QTableWidget::mousePressEvent(event);

}

void MyQTableWidget::dropEvent(QDropEvent *event)

{

    m_dpos = event->pos();

    ditem = new QTableWidgetItem();

    ditem = QTableWidget::itemAt(m_dpos);

    if (ditem == NULL)

    {

        return;

    }

    if (sitem->data(Qt::ToolTip).toString() == "this is tooltip" && ditem->data(Qt::ToolTip).toString() == "")

    {

        int r = sitem->row();

        int c = sitem->column();

        delete sitem;

        QTableWidgetItem* itemTemp = new QTableWidgetItem();

        itemTemp->setText(ditem->text());

        itemTemp->setData(Qt::ToolTip, "");

        // 文本背景色设置为白色

        itemTemp->setBackgroundColor(QColor(0xFF, 0xFF, 0xFF));

        itemTemp->setTextAlignment(Qt::AlignHCenter|Qt::AlignVCenter);

        this->setItem(r, c, itemTemp);

        ditem->setText(temp);

        ditem->setCheckState(Qt::Unchecked);

        ditem->setData(Qt::ToolTip, "this is tooltip");

        ditem->setBackgroundColor(QColor(0x00, 0xFF, 0x00));

    }

    else if (sitem->data(Qt::ToolTip).toString() == "this is tooltip" && ditem->data(Qt::ToolTip).toString() == "this is tooltip")

    {

        sitem->setText(ditem->text());

        ditem->setText(temp);

    }

    else if (sitem->data(Qt::ToolTip).toString() == "" && ditem->data(Qt::ToolTip).toString() == "this is tooltip")

    {

        sitem->setText(ditem->text());

        sitem->setCheckState(Qt::Unchecked);

        sitem->setData(Qt::ToolTip, "this is tooltip");

        sitem->setBackgroundColor(QColor(0x00, 0xFF, 0x00));

        int r = ditem->row();

        int c = ditem->column();

        delete ditem;

        QTableWidgetItem* itemTemp = new QTableWidgetItem();

        itemTemp->setText(temp);

        itemTemp->setData(Qt::ToolTip, "");

        // 文本背景色设置为白色

        itemTemp->setBackgroundColor(QColor(0xFF, 0xFF, 0xFF));

        itemTemp->setTextAlignment(Qt::AlignHCenter|Qt::AlignVCenter);

        this->setItem(r, c, itemTemp);

    }

    QTableWidget::dropEvent(event);

}

巴特西

Qt Table Widget常用操作

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