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// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
/*
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) const
{
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]
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