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directorymodel.cpp

/*
 * QMPDClient - An MPD client written in Qt 4.
 * Copyright (C) 2005-2008 HÃ¥vard Tautra Knutsen <havtknut@tihlde.org>
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 */

#include "directorymodel.h"
#include "mpddirectory.h"
#include "mpdsong.h"
#include <QMimeData>
#include <QStringList>

DirectoryModel::DirectoryModel(QObject *parent) : QAbstractItemModel(parent) {
      setObjectName("directorymodel");
}

int DirectoryModel::columnCount(const QModelIndex &) const {
      return 1;
}

QVariant DirectoryModel::data(const QModelIndex &index, int role) const {
      MPDDirectory i = directory(index);
      if (!i.isNull() && role == Qt::DisplayRole && index.column() == 0)
            return i.directoryName();
      return QVariant();
}

Qt::ItemFlags DirectoryModel::flags(const QModelIndex &index) const {
      if (!index.isValid())
            return QAbstractItemModel::flags(index);
      return Qt::ItemIsSelectable | Qt::ItemIsEnabled | Qt::ItemIsDragEnabled;
}

bool DirectoryModel::hasChildren(const QModelIndex &parent) const {
      // Top level
      if (!parent.isValid()) {
            return !m_root.isNull();
      }

      // Children
      MPDDirectory i = directory(parent);
      if (!i.isNull()) {
            return i.childCount() > 0;
      }
      return false;
}

QVariant DirectoryModel::headerData(int section, Qt::Orientation orientation, int role) const {
      if (role != Qt::DisplayRole || orientation != Qt::Horizontal || section != 0)
            return QVariant();
      return QObject::tr("Directory", "This is used as the header of directory-tree in directory view");
}

QModelIndex DirectoryModel::index(int row, int column, const QModelIndex &parent) const {
      if (row < 0 || column != 0)
            return QModelIndex();

      // Toplevel items
      if (!parent.isValid()) {
            if (row > 0) // Only one root
                  return QModelIndex();

            if (!m_root.isNull()) {
                  Q_ASSERT(row == 0 && column == 0 && !m_root.isNull());
                  return createIndex(row, column, m_root);
            }
            Q_ASSERT(m_root.isNull());
            return QModelIndex();
      }

      // Non-toplevel items
      MPDDirectory parentDirectory = directory(parent);
      if (!parentDirectory.isNull() && row < parentDirectory.childCount()) {
            MPDDirectory directory = parentDirectory.child(row);
            if (!directory.isNull())
                  return createIndex(row, column, directory);
      }
      return QModelIndex();
}

QModelIndex DirectoryModel::parent(const QModelIndex &index) const {
      MPDDirectory indexDirectory = directory(index);
      if (indexDirectory.isNull())
            return QModelIndex();

      MPDDirectory parentDirectory = indexDirectory.parent();
      if (parentDirectory.isNull()) // Toplevel directory
            return QModelIndex();

      MPDDirectory parentsparent = parentDirectory.parent();
      if (!parentsparent.isNull()) // Find index of parent in parent's parent if any
            return createIndex(parentsparent.indexOfChild(parentDirectory), 0, parentDirectory);

      // Parent has no parent, parentDirectory is toplevel
      return createIndex(0, 0, parentDirectory);
}

int DirectoryModel::rowCount(const QModelIndex &parent) const {
      if (parent.isValid()) {
            const MPDDirectory parentDir = directory(parent);
            if (!parentDir.isNull()) {
                  return parentDir.childCount();
            }
            Q_ASSERT(false);
      }
      // Parent is not valid, requesting rowcount for toplevel dir. Always 1 or 0.
      return m_root.isNull() ? 0 : 1;
}

QList<MPDDirectory> DirectoryModel::directories(const QModelIndexList &indexes) const {
      QList<MPDDirectory> ret;
      foreach(QModelIndex index, indexes) {
            ret << directory(index);
      }
      return ret;
}

MPDDirectory DirectoryModel::directory(const QModelIndex &index) const {
      if (!index.isValid())
            return MPDDirectory();
      if (!index.internalPointer())
            return MPDDirectory();
      MPDDirectoryPointer *pointer = static_cast<MPDDirectoryPointer*>(index.internalPointer());
      if (!pointer)
            return MPDDirectory();
      return pointer->directory();
}

QModelIndex DirectoryModel::createIndex(int row, int col, const MPDDirectory &dir) const {
      return QAbstractItemModel::createIndex(row, col, dir.pointer());
}

void DirectoryModel::setRoot(const MPDDirectory &root) {
      m_root = root;
      reset();
}

QStringList DirectoryModel::mimeTypes() const {
      return QStringList() << "qmpdclient/song";
}

QMimeData *DirectoryModel::mimeData(const QModelIndexList &indexes) const {
      QByteArray encodedData;
      QDataStream stream(&encodedData, QIODevice::WriteOnly);
      foreach(MPDDirectory dir, directories(indexes)) {
            stream << MPDSong::createTest(dir.absolutePath());
      }
      QMimeData *mimeData = new QMimeData;
      mimeData->setData("qmpdclient/song", encodedData);
      return mimeData;
}

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