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| ** This file is part of the examples of the Qt Toolkit. |
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| |
| #include "piecesmodel.h" |
| |
| #include <QIcon> |
| #include <QMimeData> |
| #include <QRandomGenerator> |
| |
| PiecesModel::PiecesModel(int pieceSize, QObject *parent) |
| : QAbstractListModel(parent), m_PieceSize(pieceSize) |
| { |
| } |
| |
| 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(m_PieceSize, m_PieceSize, |
| 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 (QRandomGenerator::global()->bounded(2) == 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 (QAbstractListModel::flags(index)|Qt::ItemIsDragEnabled); |
| |
| return 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); |
| |
| for (const QModelIndex &index : indexes) { |
| if (index.isValid()) { |
| QPixmap pixmap = qvariant_cast<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 |
| { |
| return parent.isValid() ? 0 : pixmaps.size(); |
| } |
| |
| Qt::DropActions PiecesModel::supportedDropActions() const |
| { |
| return Qt::CopyAction | Qt::MoveAction; |
| } |
| |
| void PiecesModel::addPieces(const QPixmap &pixmap) |
| { |
| if (!pixmaps.isEmpty()) { |
| beginRemoveRows(QModelIndex(), 0, pixmaps.size() - 1); |
| pixmaps.clear(); |
| locations.clear(); |
| endRemoveRows(); |
| } |
| for (int y = 0; y < 5; ++y) { |
| for (int x = 0; x < 5; ++x) { |
| QPixmap pieceImage = pixmap.copy(x*m_PieceSize, y*m_PieceSize, m_PieceSize, m_PieceSize); |
| addPiece(pieceImage, QPoint(x, y)); |
| } |
| } |
| } |