[C++知识库]QTableWidget 设置翻页和滑动滚动条时页数自动更新

? 本文程序效果如下：

代码如下

///.cpp

#include "QtableWidget.h"

QtableWidget::QtableWidget(QWidget *parent)
    : QMainWindow(parent)
{
    ui.setupUi(this);
	ui.tableWidget->setShowGrid(true);
	ui.tableWidget->setSelectionBehavior(QAbstractItemView::SelectRows);
	ui.tableWidget->setSelectionMode(QAbstractItemView::SingleSelection);
	ui.tableWidget->setColumnCount(2);
	ui.tableWidget->verticalHeader()->hide();//取消默认行号
	QStringList header;
	header << tr("No") << tr("Value");
	ui.tableWidget->setHorizontalHeaderLabels(header);
	m_nCurPage = 1;
	m_nRowsPerPage = 7;
	m_nTotalPages = 1;
	InitTable();

	connect(ui.pbtnBefore,SIGNAL(clicked()),this,SLOT(OnBtnPrePage()));	//响应上一页
	connect(ui.btnNext, SIGNAL(clicked()), this, SLOT(OnBtnNextPage()));//响应下一页
	connect(ui.tableWidget->verticalScrollBar(), SIGNAL(valueChanged(int)),this,SLOT(OnSlideAction(int)));//响应滚动条翻页
}

void QtableWidget::InitTable()
{
	for (int i = 0; i < 100;i++)
	{
		m_vecData.push_back(i);
	}


	//计算总页数-----本demo一个数据一行数据。若是一行多个数据，请按照多个数据计算页数。

	if (m_vecData.size() % m_nRowsPerPage == 0) //计算总页数
	{
		m_nTotalPages = m_vecData.size() / m_nRowsPerPage;
	}	
	else 
	{
		m_nTotalPages = m_vecData.size() / m_nRowsPerPage + 1;
	}
	
	//插入表数据---本demo一个数据一行数据。若是一行多个数据，请按照数据个数插入表格数据。
	ui.labPage->setText(QString("%1/%2").arg(m_nCurPage).arg(m_nTotalPages));
	ui.tableWidget->setRowCount(m_nTotalPages* m_nRowsPerPage); //设置显示的行数
	for (int i = 0; i < m_vecData.size(); i++)
	{
		ui.tableWidget->setItem(i, 0, new QTableWidgetItem(QString::number(m_vecData[i] + 1)));
		ui.tableWidget->setItem(i, 1, new QTableWidgetItem(QString::number(m_vecData[i] + 1)));
	}


}

void QtableWidget::OnBtnPrePage()
{
	m_nCurPage--;
	if (m_nCurPage <= 0)
	{
		m_nCurPage = m_nTotalPages;
	}

	ui.tableWidget->verticalScrollBar()->setSliderPosition(m_nCurPage*m_nRowsPerPage - m_nRowsPerPage);
	ui.labPage->setText(QString("%1/%2").arg(m_nCurPage).arg(m_nTotalPages));
}

void QtableWidget::OnBtnNextPage()
{
	m_nCurPage++;
	if (m_nCurPage > m_nTotalPages)
	{
		m_nCurPage = 1;
	}

	ui.tableWidget->verticalScrollBar()->setSliderPosition(m_nCurPage*m_nRowsPerPage - m_nRowsPerPage);
	ui.labPage->setText(QString("%1/%2").arg(m_nCurPage).arg(m_nTotalPages));
}

void QtableWidget::OnSlideAction(int nRowIndex)
{
	qDebug() << "Row " << nRowIndex << endl;
	
	++nRowIndex;
	//计算当前行是那一页
	if (nRowIndex % m_nRowsPerPage == 0)
	{
		m_nCurPage = nRowIndex / m_nRowsPerPage;
	}
	else
	{
		m_nCurPage = nRowIndex / m_nRowsPerPage+1;
	}
	ui.labPage->setText(QString("%1/%2").arg(m_nCurPage).arg(m_nTotalPages));
}

//.h//
#pragma once

#include <QtWidgets/QMainWindow>
#include "ui_QtableWidget.h"
#include <qtablewidget.h>
#include <vector>
#include <qscrollbar.h>
#include <qdebug.h>
using namespace std;
class QtableWidget : public QMainWindow
{
    Q_OBJECT

public:
    QtableWidget(QWidget *parent = Q_NULLPTR);

	//初始化数据
	void	InitTable();

public slots:
	void OnBtnPrePage();

	void OnBtnNextPage();

	void OnSlideAction(int nRowIndex);
private:
    Ui::QtableWidgetClass ui;

	vector <int> m_vecData;	//数据
	int m_nCurPage;		//当前页数
	int m_nRowsPerPage; //每页显示的行数
	int m_nTotalPages; //表格总页数
};

注：用到的滑动条的信号

[signal] void QAbstractSlider::valueChanged(int value)

This signal is emitted when the slider value has changed, with the new slider value as argument.

Note: Notifier signal for property value.

本文章部分代码参考于QTableWidget实现表格数据显示以及翻页效果_shuifei2020的博客-CSDN博客_qtablewidget翻页

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