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<pre> /****************************************************************************
**
** Copyright (C) 2005-2006 Trolltech ASA. All rights reserved.
**
** This file is part of the example classes of the Qt Toolkit.
**
** This file may be used under the terms of the GNU General Public
** License version 2.0 as published by the Free Software Foundation
** and appearing in the file LICENSE.GPL included in the packaging of
** this file. Please review the following information to ensure GNU
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****************************************************************************/
#include <QtGui>
#include "piecesmodel.h"
PiecesModel::PiecesModel(QObject *parent)
: QAbstractListModel(parent)
{
}
QVariant PiecesModel::data(const QModelIndex &index, int role) const
{
if (!index.isValid())
return QVariant();
if (role == Qt::DecorationRole)
return QIcon(pixmaps.value(index.row()).scaled(60, 60,
Qt::KeepAspectRatio, Qt::SmoothTransformation));
else if (role == Qt::UserRole)
return pixmaps.value(index.row());
else if (role == Qt::UserRole + 1)
return locations.value(index.row());
return QVariant();
}
void PiecesModel::addPiece(const QPixmap &pixmap, const QPoint &location)
{
int row;
if (int(2.0*qrand()/(RAND_MAX+1.0)) == 1)
row = 0;
else
row = pixmaps.size();
beginInsertRows(QModelIndex(), row, row);
pixmaps.insert(row, pixmap);
locations.insert(row, location);
endInsertRows();
}
Qt::ItemFlags PiecesModel::flags(const QModelIndex &index) const
{
if (index.isValid()) {
return (Qt::ItemIsEnabled | Qt::ItemIsSelectable
| Qt::ItemIsDragEnabled | Qt::ItemIsSelectable);
}
return Qt::ItemIsEnabled | Qt::ItemIsDropEnabled;
}
bool PiecesModel::removeRows(int row, int count, const QModelIndex &parent)
{
if (parent.isValid())
return false;
if (row >= pixmaps.size() || row + count <= 0)
return false;
int beginRow = qMax(0, row);
int endRow = qMin(row + count - 1, pixmaps.size() - 1);
beginRemoveRows(parent, beginRow, endRow);
while (beginRow <= endRow) {
pixmaps.removeAt(beginRow);
locations.removeAt(beginRow);
++beginRow;
}
endRemoveRows();
return true;
}
QStringList PiecesModel::mimeTypes() const
{
QStringList types;
types << "image/x-puzzle-piece";
return types;
}
QMimeData *PiecesModel::mimeData(const QModelIndexList &indexes) const
{
QMimeData *mimeData = new QMimeData();
QByteArray encodedData;
QDataStream stream(&encodedData, QIODevice::WriteOnly);
foreach (QModelIndex index, indexes) {
if (index.isValid()) {
QPixmap pixmap = qVariantValue<QPixmap>(data(index, Qt::UserRole));
QPoint location = data(index, Qt::UserRole+1).toPoint();
stream << pixmap << location;
}
}
mimeData->setData("image/x-puzzle-piece", encodedData);
return mimeData;
}
bool PiecesModel::dropMimeData(const QMimeData *data, Qt::DropAction action,
int row, int column, const QModelIndex &parent)
{
if (!data->hasFormat("image/x-puzzle-piece"))
return false;
if (action == Qt::IgnoreAction)
return true;
if (column > 0)
return false;
int endRow;
if (!parent.isValid()) {
if (row < 0)
endRow = pixmaps.size();
else
endRow = qMin(row, pixmaps.size());
} else
endRow = parent.row();
QByteArray encodedData = data->data("image/x-puzzle-piece");
QDataStream stream(&encodedData, QIODevice::ReadOnly);
while (!stream.atEnd()) {
QPixmap pixmap;
QPoint location;
stream >> pixmap >> location;
beginInsertRows(QModelIndex(), endRow, endRow);
pixmaps.insert(endRow, pixmap);
locations.insert(endRow, location);
endInsertRows();
++endRow;
}
return true;
}
int PiecesModel::rowCount(const QModelIndex &parent) const
{
if (parent.isValid())
return 0;
else
return pixmaps.size();
}
Qt::DropActions PiecesModel::supportedDropActions() const
{
return Qt::CopyAction | Qt::MoveAction;
}
void PiecesModel::addPieces(const QPixmap& pixmap)
{
beginRemoveRows(QModelIndex(), 0, 24);
pixmaps.clear();
locations.clear();
endRemoveRows();
for (int y = 0; y < 5; ++y) {
for (int x = 0; x < 5; ++x) {
QPixmap pieceImage = pixmap.copy(x*80, y*80, 80, 80);
addPiece(pieceImage, QPoint(x, y));
}
}
}</pre>
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