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| |
| /* |
| model.cpp |
| |
| A simple model that uses a QStringList as its data source. |
| */ |
| |
| #include <QtWidgets> |
| |
| #include "model.h" |
| |
| DragDropListModel::DragDropListModel(const QStringList &strings, |
| QObject *parent) |
| : QStringListModel(strings, parent) |
| { |
| } |
| |
| //! [0] |
| bool DragDropListModel::canDropMimeData(const QMimeData *data, |
| Qt::DropAction action, int row, int column, const QModelIndex &parent) |
| { |
| Q_UNUSED(action); |
| Q_UNUSED(row); |
| Q_UNUSED(parent); |
| |
| if (!data->hasFormat("application/vnd.text.list")) |
| return false; |
| |
| if (column > 0) |
| return false; |
| |
| return true; |
| } |
| //! [0] |
| //! [1] |
| bool DragDropListModel::dropMimeData(const QMimeData *data, |
| Qt::DropAction action, int row, int column, const QModelIndex &parent) |
| { |
| if (!canDropMimeData(data, action, row, column, parent)) |
| return false; |
| |
| if (action == Qt::IgnoreAction) |
| return true; |
| //! [1] |
| |
| //! [2] |
| int beginRow; |
| |
| if (row != -1) |
| beginRow = row; |
| //! [2] //! [3] |
| else if (parent.isValid()) |
| beginRow = parent.row(); |
| //! [3] //! [4] |
| else |
| beginRow = rowCount(QModelIndex()); |
| //! [4] |
| |
| //! [5] |
| QByteArray encodedData = data->data("application/vnd.text.list"); |
| QDataStream stream(&encodedData, QIODevice::ReadOnly); |
| QStringList newItems; |
| int rows = 0; |
| |
| while (!stream.atEnd()) { |
| QString text; |
| stream >> text; |
| newItems << text; |
| ++rows; |
| } |
| //! [5] |
| |
| //! [6] |
| insertRows(beginRow, rows, QModelIndex()); |
| for (const QString &text : qAsConst(newItems)) { |
| QModelIndex idx = index(beginRow, 0, QModelIndex()); |
| setData(idx, text); |
| beginRow++; |
| } |
| |
| return true; |
| } |
| //! [6] |
| |
| //! [7] |
| Qt::ItemFlags DragDropListModel::flags(const QModelIndex &index) const |
| { |
| Qt::ItemFlags defaultFlags = QStringListModel::flags(index); |
| |
| if (index.isValid()) |
| return Qt::ItemIsDragEnabled | Qt::ItemIsDropEnabled | defaultFlags; |
| else |
| return Qt::ItemIsDropEnabled | defaultFlags; |
| } |
| //! [7] |
| |
| //! [8] |
| QMimeData *DragDropListModel::mimeData(const QModelIndexList &indexes) const |
| { |
| QMimeData *mimeData = new QMimeData; |
| QByteArray encodedData; |
| |
| QDataStream stream(&encodedData, QIODevice::WriteOnly); |
| |
| for (const QModelIndex &index : indexes) { |
| if (index.isValid()) { |
| QString text = data(index, Qt::DisplayRole).toString(); |
| stream << text; |
| } |
| } |
| |
| mimeData->setData("application/vnd.text.list", encodedData); |
| return mimeData; |
| } |
| //! [8] |
| |
| //! [9] |
| QStringList DragDropListModel::mimeTypes() const |
| { |
| QStringList types; |
| types << "application/vnd.text.list"; |
| return types; |
| } |
| //! [9] |
| |
| //! [10] |
| Qt::DropActions DragDropListModel::supportedDropActions() const |
| { |
| return Qt::CopyAction | Qt::MoveAction; |
| } |
| //! [10] |