1.简介
QAbstractListModel类提供了一个抽象模型,可以将其子类化以创建一维列表模型。
QAbstractListModel为将其数据表示为简单的非层次项目序列的模型提供了一个标准接口。它不直接使用,但必须进行子类化。
由于该模型提供了比QAbstractItemModel更专业的接口,因此不适合与树视图一起使用;如果您想提供一个用于此目的的模型,则需要对QAbstractItemModel进行子类化。如果您需要使用多个列表模型来管理数据,则可能更适合使用子类QAbstractTableModel。
继承QAbstractListModel,需要重写rowCount()、data()、insertRows()、removeRows()等函数。
- rowCount()函数返回模型的行数。
- data()函数返回指定索引处的数据。
- insertRows()插入行
- removeRows()删除行
2.示例
#ifndef MYLISTMODEL_H
#define MYLISTMODEL_H#include <QAbstractListModel>
#include <QObject>
#include <QList>typedef struct _student
{QString name;int age;double score;
}Student;class MyListModel : public QAbstractListModel
{Q_OBJECT
public:MyListModel(QObject *parent = nullptr);enum RoleNames{Name,Age,Score};public://更新void update(QList<Student> students);// 返回列表中行的数量virtual int rowCount(const QModelIndex &parent = QModelIndex()) const;// 返回指定索引处的数据virtual QVariant data(const QModelIndex &index, int role = Qt::DisplayRole) const;//插入行virtual bool insertRows(int row, int count, const QModelIndex &parent = QModelIndex());//删除行virtual bool removeRows(int row, int count, const QModelIndex &parent = QModelIndex());private:QList<Student> m_lstStu;
};#endif // MYLISTMODEL_H#include "MyListModel.h"MyListModel::MyListModel(QObject *parent): QAbstractListModel(parent)
{}void MyListModel::update(QList<Student> students)
{m_lstStu = students;for(int i=0;i<m_lstStu.size();i++){beginInsertRows(QModelIndex(),i,i);endInsertRows();}
}int MyListModel::rowCount(const QModelIndex &parent) const
{Q_UNUSED(parent);return m_lstStu.size();
}QVariant MyListModel::data(const QModelIndex &index, int role) const
{if(!index.isValid())return QVariant();int nRow = index.row();Student stu = m_lstStu.at(nRow);if (role == Qt::DisplayRole || role == Qt::EditRole){QString ret = QString("%1_%2_%3").arg(stu.name).arg(stu.age).arg(stu.score);return ret;}return QVariant();
}bool MyListModel::insertRows(int row, int count, const QModelIndex &parent)
{if (row >= 0 && row <= m_lstStu.size()){beginInsertRows(parent, row, row + count - 1);for (int i = 0; i < count; ++i){//插入一个空的数据Student stu;stu.name = QString();stu.age = 0;stu.score = 0;m_lstStu.insert(row, stu);}endInsertRows();return true;}return false;
}bool MyListModel::removeRows(int row, int count, const QModelIndex &parent)
{if (row >= 0 && row + count <= m_lstStu.size()){beginRemoveRows(parent, row, row + count - 1);for (int i = 0; i < count; ++i){m_lstStu.removeAt(row);}endRemoveRows();return true;}return false;
}
使用:
#include "ListForm.h"
#include "ui_ListForm.h"
#include "MyListModel.h"MyListModel *pModel = nullptr;ListForm::ListForm(QWidget *parent) :QWidget(parent),ui(new Ui::ListForm)
{ui->setupUi(this);//去除选中虚线框ui->listView->setFocusPolicy(Qt::NoFocus);//设置整行选中ui->listView->setSelectionBehavior(QAbstractItemView::SelectRows);pModel = new MyListModel(this);// 构造数据,更新界面QList<Student> students;QList<QString> nameList;nameList<<"张三"<<"李四"<<"王二"<<"赵五"<<"刘六";for (int i = 0; i < 5; ++i){Student student;student.name = nameList.at(i);student.age = qrand()%6 + 13;//随机生成13到19的随机数student.score = qrand()%20 + 80;//随机生成0到100的随机数;students.append(student);}pModel->update(students);ui->listView->setModel(pModel);
}ListForm::~ListForm()
{delete ui;
}void ListForm::on_btnInsert_clicked()
{if(!pModel)return;int row = ui->listView->currentIndex().row();if(row < 0)return;pModel->insertRows(row+1,1);
}void ListForm::on_btnDel_clicked()
{if(!pModel)return;int row = ui->listView->currentIndex().row();if(row < 0)return;pModel->removeRows(row,1);
}