filelistmodel.cpp Example File

itemviews/fetchmore/filelistmodel.cpp
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#include "filelistmodel.h" #include <QApplication> #include <QBrush> #include <QDir> #include <QPalette> FileListModel::FileListModel(QObject *parent) : QAbstractListModel(parent) { } int FileListModel::rowCount(const QModelIndex & /* parent */) const { return fileCount; } QVariant FileListModel::data(const QModelIndex &index, int role) const { if (!index.isValid()) return QVariant(); if (index.row() >= fileList.size() || index.row() < 0) return QVariant(); if (role == Qt::DisplayRole) { return fileList.at(index.row()); } else if (role == Qt::BackgroundRole) { int batch = (index.row() / 100) % 2; if (batch == 0) return qApp->palette().base(); else return qApp->palette().alternateBase(); } return QVariant(); } bool FileListModel::canFetchMore(const QModelIndex & /* index */) const { if (fileCount < fileList.size()) return true; else return false; } void FileListModel::fetchMore(const QModelIndex & /* index */) { int remainder = fileList.size() - fileCount; int itemsToFetch = qMin(100, remainder); if (itemsToFetch <= 0) return; beginInsertRows(QModelIndex(), fileCount, fileCount+itemsToFetch-1); fileCount += itemsToFetch; endInsertRows(); emit numberPopulated(itemsToFetch); } void FileListModel::setDirPath(const QString &path) { QDir dir(path); beginResetModel(); fileList = dir.entryList(); fileCount = 0; endResetModel(); }