Qt Table Widget常用操作

Posted 2020-12-01 duxie

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

// 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 == 2)
    {
        ui.tableWidget->sortItems(index, Qt::DescendingOrder);
        return;
    }
    ui.tableWidget->sortItems(index, Qt::AscendingOrder);
}

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, 3, 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 == 3)
    {
        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));
            }
        }
    }
}