view data/model/ModelDataTableModel.cpp @ 1455:ec9e65fcf749

The use of the begin/end pairs here just seems to cause too many rows to be deleted (from the visual representation, not the underlying model). Things apparently work better if we just modify the underlying model and let the change signals percolate back up again. To that end, update the change handlers so as to cover their proper ranges with dataChanged signals.

/* -*- c-basic-offset: 4 indent-tabs-mode: nil -*-  vi:set ts=8 sts=4 sw=4: */

/*
    Sonic Visualiser
    An audio file viewer and annotation editor.
    Centre for Digital Music, Queen Mary, University of London.
    This file copyright 2008 QMUL.
    
    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.  See the file
    COPYING included with this distribution for more information.
*/

#include "ModelDataTableModel.h"

#include "TabularModel.h"
#include "Model.h"

#include <map>
#include <algorithm>
#include <iostream>

ModelDataTableModel::ModelDataTableModel(TabularModel *m) :
    m_model(m),
    m_sortColumn(0),
    m_sortOrdering(Qt::AscendingOrder),
    m_currentRow(0)
{
    Model *baseModel = dynamic_cast<Model *>(m);

    connect(baseModel, SIGNAL(modelChanged()), this, SLOT(modelChanged()));
    connect(baseModel, SIGNAL(modelChangedWithin(sv_frame_t, sv_frame_t)),
            this, SLOT(modelChangedWithin(sv_frame_t, sv_frame_t)));
    connect(baseModel, SIGNAL(aboutToBeDeleted()),
            this, SLOT(modelAboutToBeDeleted()));
}

ModelDataTableModel::~ModelDataTableModel()
{
}

QVariant
ModelDataTableModel::data(const QModelIndex &index, int role) const
{
    if (!m_model) return QVariant();
    if (role != Qt::EditRole && role != Qt::DisplayRole) return QVariant();
    if (!index.isValid()) return QVariant();
    QVariant d = m_model->getData(getUnsorted(index.row()), index.column(), role);
    return d;
}

bool
ModelDataTableModel::setData(const QModelIndex &index, const QVariant &value, int role)
{
    if (!m_model) return false;
    if (!index.isValid()) return false;
    Command *command = m_model->getSetDataCommand(getUnsorted(index.row()),
                                                  index.column(),
                                                  value, role);
    if (command) {
        emit addCommand(command);
        return true;
    } else {
        return false;
    }
}

bool
ModelDataTableModel::insertRow(int row, const QModelIndex &parent)
{
    if (!m_model) return false;
    if (parent.isValid()) return false;

    Command *command = m_model->getInsertRowCommand(getUnsorted(row));

    if (command) {
        emit addCommand(command);
    }

    return (command ? true : false);
}

bool
ModelDataTableModel::removeRow(int row, const QModelIndex &parent)
{
    if (!m_model) return false;
    if (parent.isValid()) return false;

    Command *command = m_model->getRemoveRowCommand(getUnsorted(row));

    if (command) {
        emit addCommand(command);
    }

    return (command ? true : false);
}

Qt::ItemFlags
ModelDataTableModel::flags(const QModelIndex &) const
{
    Qt::ItemFlags flags = Qt::ItemIsEnabled | Qt::ItemIsEditable |
        Qt::ItemIsDragEnabled | Qt::ItemIsDropEnabled | Qt::ItemIsSelectable;
    return flags;
}

QVariant
ModelDataTableModel::headerData(int section, Qt::Orientation orientation, int role) const
{
    if (!m_model) return QVariant();

    if (orientation == Qt::Vertical && role == Qt::DisplayRole) {
        return section + 1;
    }
    if (orientation == Qt::Horizontal && role == Qt::DisplayRole) {
        return m_model->getHeading(section);
    } 
    return QVariant();
}

QModelIndex
ModelDataTableModel::index(int row, int column, const QModelIndex &) const
{
    return createIndex(row, column, (void *)0);
}

QModelIndex
ModelDataTableModel::parent(const QModelIndex &) const
{
    return QModelIndex();
}

int
ModelDataTableModel::rowCount(const QModelIndex &parent) const
{
    if (!m_model) return 0;
    if (parent.isValid()) return 0;
    int count = m_model->getRowCount();
    return count;
}

int
ModelDataTableModel::columnCount(const QModelIndex &parent) const
{
    if (!m_model) return 0;
    if (parent.isValid()) return 0;
    return m_model->getColumnCount();
}

QModelIndex 
ModelDataTableModel::getModelIndexForFrame(sv_frame_t frame) const
{
    if (!m_model) return createIndex(0, 0);
    int row = m_model->getRowForFrame(frame);
    return createIndex(getSorted(row), 0, (void *)0);
}

sv_frame_t
ModelDataTableModel::getFrameForModelIndex(const QModelIndex &index) const
{
    if (!m_model) return 0;
    return m_model->getFrameForRow(getUnsorted(index.row()));
}

QModelIndex
ModelDataTableModel::findText(QString text) const
{
    if (text == "") return QModelIndex();
    int rows = rowCount();
    int cols = columnCount();
    int current = getCurrentRow();
    for (int row = 1; row <= rows; ++row) {
        int wrapped = (row + current) % rows;
        for (int col = 0; col < cols; ++col) {
            if (m_model->getSortType(col) != TabularModel::SortAlphabetical) {
                continue;
            }
            QString cell = m_model->getData(getUnsorted(wrapped), col,
                                            Qt::DisplayRole).toString();
            if (cell.contains(text, Qt::CaseInsensitive)) {
                return createIndex(wrapped, col);
            }
        }
    }
    return QModelIndex();
}

void
ModelDataTableModel::sort(int column, Qt::SortOrder sortOrder)
{
//    SVDEBUG << "ModelDataTableModel::sort(" << column << ", " << sortOrder
//              << ")" << endl;
    int prevCurrent = getCurrentRow();
    if (m_sortColumn != column) {
        clearSort();
    }
    m_sortColumn = column;
    m_sortOrdering = sortOrder;
    int current = getCurrentRow();
    if (current != prevCurrent) {
//         cerr << "Current row changed from " << prevCurrent << " to " << current << " for underlying row " << m_currentRow << endl;
        emit currentChanged(createIndex(current, 0, (void *)0));
    }
    emit layoutChanged();
}

void
ModelDataTableModel::modelChanged()
{
    SVDEBUG << "ModelDataTableModel::modelChanged" << endl;
    QModelIndex ix0;
    QModelIndex ix1;
    if (rowCount() > 0) {
        ix0 = createIndex(0, 0);
        int lastCol = columnCount() - 1;
        if (lastCol < 0) lastCol = 0;
        ix1 = createIndex(rowCount(), lastCol);
    }
    SVDEBUG << "emitting dataChanged from row " << ix0.row() << " to " << ix1.row() << endl;
    emit dataChanged(ix0, ix1);
    clearSort();
    emit layoutChanged();
}

void 
ModelDataTableModel::modelChangedWithin(sv_frame_t f0, sv_frame_t f1)
{
    SVDEBUG << "ModelDataTableModel::modelChangedWithin(" << f0 << "," << f1 << ")" << endl;
    QModelIndex ix0 = getModelIndexForFrame(f0);
    QModelIndex ix1 = getModelIndexForFrame(f1);
    int row0 = ix0.row();
    int row1 = ix1.row();
    if (row0 > 0) {
        ix0 = createIndex(row0 - 1, ix0.column(), (void *)0);
    }
    if (row1 + 1 < rowCount()) {
        ix1 = createIndex(row1 + 1, ix1.column(), (void *)0);
    }
    SVDEBUG << "emitting dataChanged from row " << ix0.row() << " to " << ix1.row() << endl;
    emit dataChanged(ix0, ix1);
    clearSort();
    emit layoutChanged();
}

void
ModelDataTableModel::modelAboutToBeDeleted()
{
    m_model = 0;
    emit modelRemoved();
}

int
ModelDataTableModel::getSorted(int row) const
{
    if (!m_model) return row;

    if (m_model->isColumnTimeValue(m_sortColumn)) {
        if (m_sortOrdering == Qt::AscendingOrder) {
            return row;
        } else {
            return rowCount() - row - 1;
        }
    }

    if (m_sort.empty()) {
        resort();
    }
    int result = 0;
    if (row >= 0 && row < (int)m_sort.size()) {
        result = m_sort[row];
    }
    if (m_sortOrdering == Qt::DescendingOrder) {
        result = rowCount() - result - 1;
    }

    return result;
}

int
ModelDataTableModel::getUnsorted(int row) const
{
    if (!m_model) return row;

    if (m_model->isColumnTimeValue(m_sortColumn)) {
        if (m_sortOrdering == Qt::AscendingOrder) {
            return row;
        } else {
            return rowCount() - row - 1;
        }
    }

    if (m_sort.empty()) {
        resort();
    }

    int result = 0;
    if (row >= 0 && row < (int)m_sort.size()) {
        if (m_sortOrdering == Qt::AscendingOrder) {
            result = m_rsort[row];
        } else {
            result = m_rsort[rowCount() - row - 1];
        }
    }

    return result;
}

void
ModelDataTableModel::resort() const
{
    if (!m_model) return;

    bool numeric = (m_model->getSortType(m_sortColumn) ==
                    TabularModel::SortNumeric);

//    cerr << "resort: numeric == " << numeric << endl;

    m_sort.clear();
    m_rsort.clear();

    if (numeric) resortNumeric();
    else resortAlphabetical();

    std::map<int, int> tmp;

    // rsort maps from sorted row number to original row number

    for (int i = 0; i < (int)m_rsort.size(); ++i) {
        tmp[m_rsort[i]] = i;
    }

    // tmp now maps from original row number to sorted row number

    for (std::map<int, int>::const_iterator i = tmp.begin(); i != tmp.end(); ++i) {
        m_sort.push_back(i->second);
    }

    // and sort now maps from original row number to sorted row number
}

void
ModelDataTableModel::resortNumeric() const
{
    if (!m_model) return;

    typedef std::multimap<double, int> MapType;

    MapType rowMap;
    int rows = m_model->getRowCount();

    for (int i = 0; i < rows; ++i) {
        QVariant value = m_model->getData(i, m_sortColumn, TabularModel::SortRole);
        rowMap.insert(MapType::value_type(value.toDouble(), i));
    }

    for (MapType::iterator i = rowMap.begin(); i != rowMap.end(); ++i) {
//        cerr << "resortNumeric: " << i->second << ": " << i->first << endl;
        m_rsort.push_back(i->second);
    }

    // rsort now maps from sorted row number to original row number
}

void
ModelDataTableModel::resortAlphabetical() const
{
    if (!m_model) return;

    typedef std::multimap<QString, int> MapType;

    MapType rowMap;
    int rows = m_model->getRowCount();

    for (int i = 0; i < rows; ++i) {
        QVariant value =
            m_model->getData(i, m_sortColumn, TabularModel::SortRole);
        rowMap.insert(MapType::value_type(value.toString(), i));
    }

    for (MapType::iterator i = rowMap.begin(); i != rowMap.end(); ++i) {
//        cerr << "resortAlphabetical: " << i->second << ": " << i->first << endl;
        m_rsort.push_back(i->second);
    }

    // rsort now maps from sorted row number to original row number
}

int
ModelDataTableModel::getCurrentRow() const
{
    return getSorted(m_currentRow);
}

void
ModelDataTableModel::setCurrentRow(int row)
{
    m_currentRow = getUnsorted(row);
}

void
ModelDataTableModel::clearSort()
{
//    int prevCurrent = getCurrentRow();
    m_sort.clear();
//    int current = getCurrentRow(); //!!! no --  not until the sort criteria have changed
//    if (current != prevCurrent) {
//        cerr << "Current row changed from " << prevCurrent << " to " << current << " for underlying row " << m_currentRow << endl;
//        emit currentRowChanged(createIndex(current, 0, 0));
//    }
}