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继承QAbstractListModel,结合QListView

2024/7/7 0:52:23 来源:https://blog.csdn.net/weixin_51883798/article/details/140089351  浏览:    关键词:继承QAbstractListModel,结合QListView

这里想要写一个QAbstractListModel的子类,学习一下如何实例化QAbstractListModel。

QAbstractListModel子类化-CSDN博客

QVariant与自定义类型互转之奇巧淫技_qt 类型转 qvariant-CSDN博客

#pragma once#include <QStyledItemDelegate>
#include <qmetatype.h>class QListView;
class WItemDelegate1 : public QStyledItemDelegate
{Q_OBJECTpublic:WItemDelegate1(QListView* parent = nullptr);~WItemDelegate1();void paint(QPainter* painter, const QStyleOptionViewItem& option, const QModelIndex& index) const override;QSize sizeHint(const QStyleOptionViewItem& option, const QModelIndex& index) const override;
};
#include "WItemDelegate1.h"
#include "qlistview.h"
#include "qpainter.h"
#include "qsqlquerymodel.h"
#include <qdebug.h>
#include "ListModel.h"
WItemDelegate1::WItemDelegate1(QListView* parent): QStyledItemDelegate(parent)
{
}WItemDelegate1::~WItemDelegate1()
{}
QSize WItemDelegate1::sizeHint(const QStyleOptionViewItem& option, const QModelIndex& index) const
{return QSize(option.rect.width(), 60);
}
void WItemDelegate1::paint(QPainter* painter, const QStyleOptionViewItem& option, const QModelIndex& index) const
{if (index.isValid()) {int row = index.row();QSqlQueryModel* Model = (QSqlQueryModel*)index.model();QVariant data = index.data(Qt::DisplayRole);WItemData d = data.value<WItemData>();QRect rect = option.rect;//qDebug() << rect;int wx = 5;int wy = 5;rect.setX(rect.x() + wx);rect.setY(rect.y() + wy);rect.setWidth(rect.width() - wx * 2);rect.setHeight(rect.height() - wy * 2);//qDebug() << rect;QString text = QString("rowid:%1,col1:%2,col2:%3").arg(d.rowid).arg(d.col1).arg(d.col2);painter->setBrush(QColor(0, 0, 0));painter->drawRoundedRect(rect, 5, 5);painter->setPen(QColor(255, 255, 255));painter->drawText(rect, text, QTextOption(Qt::AlignCenter));}
}
#pragma once#include <QAbstractListModel>
#include <QMetaType>typedef struct {int rowid;int col1;int col2;
} WItemData;Q_DECLARE_METATYPE(WItemData)class ListModel  : public QAbstractListModel
{Q_OBJECTpublic:ListModel(QObject *parent = nullptr);~ListModel();//当子类化QAbstractListModel时,必须提供rowCount()和data()函数的实现virtual QVariant data(const QModelIndex& index, int role = Qt::DisplayRole) const;virtual int	rowCount(const QModelIndex& parent = QModelIndex()) const;private:QList<WItemData> m_List;
};
#include "ListModel.h"ListModel::ListModel(QObject *parent): QAbstractListModel(parent)
{for (int i = 0; i < 100000; i++){WItemData data;data.rowid = i;data.col1 = i;data.col2 = i;m_List << data;}
}ListModel::~ListModel()
{}QVariant ListModel::data(const QModelIndex& index, int role /*= Qt::DisplayRole*/) const
{if (!index.isValid()){return QVariant();}if (Qt::DisplayRole == role){WItemData data(m_List.at(index.row()));QVariant variant;variant.setValue<WItemData>(data);return variant;}return QVariant();
}int ListModel::rowCount(const QModelIndex& parent /*= QModelIndex()*/) const
{return m_List.size();
}
    ListModel* listModel = new ListModel;listView = new QListView;listView->setModel(listModel);WItemDelegate1* wItemDelegate = new WItemDelegate1(listView);listView->setItemDelegate(wItemDelegate);listView->show();

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