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Diffstat (limited to 'sources/pyside2/doc/codesnippets/doc/src/snippets/modelview-subclasses/model.cpp')
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1 files changed, 162 insertions, 0 deletions
diff --git a/sources/pyside2/doc/codesnippets/doc/src/snippets/modelview-subclasses/model.cpp b/sources/pyside2/doc/codesnippets/doc/src/snippets/modelview-subclasses/model.cpp new file mode 100644 index 000000000..50ba15020 --- /dev/null +++ b/sources/pyside2/doc/codesnippets/doc/src/snippets/modelview-subclasses/model.cpp @@ -0,0 +1,162 @@ +/**************************************************************************** +** +** Copyright (C) 2016 The Qt Company Ltd. +** Contact: https://www.qt.io/licensing/ +** +** This file is part of the examples of PySide2. +** +** $QT_BEGIN_LICENSE:BSD$ +** Commercial License Usage +** Licensees holding valid commercial Qt licenses may use this file in +** accordance with the commercial license agreement provided with the +** Software or, alternatively, in accordance with the terms contained in +** a written agreement between you and The Qt Company. For licensing terms +** and conditions see https://www.qt.io/terms-conditions. For further +** information use the contact form at https://www.qt.io/contact-us. +** +** BSD License Usage +** Alternatively, you may use this file under the terms of the BSD license +** as follows: +** +** "Redistribution and use in source and binary forms, with or without +** modification, are permitted provided that the following conditions are +** met: +** * Redistributions of source code must retain the above copyright +** notice, this list of conditions and the following disclaimer. +** * Redistributions in binary form must reproduce the above copyright +** notice, this list of conditions and the following disclaimer in +** the documentation and/or other materials provided with the +** distribution. +** * Neither the name of The Qt Company Ltd nor the names of its +** contributors may be used to endorse or promote products derived +** from this software without specific prior written permission. +** +** +** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS +** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT +** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR +** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT +** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, +** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT +** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, +** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY +** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT +** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE +** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE." +** +** $QT_END_LICENSE$ +** +****************************************************************************/ + +/* + model.cpp + + A simple model that uses a QVector as its data source. +*/ + +#include "model.h" + +/*! + Returns the number of items in the string list as the number of rows + in the model. +*/ + +int LinearModel::rowCount(const QModelIndex &parent) const +{ + Q_USING(parent); + + return values.count(); +} + +/* + Returns an appropriate value for the requested data. + If the view requests an invalid index, an invalid variant is returned. + If a header is requested then we just return the column or row number, + depending on the orientation of the header. + Any valid index that corresponds to a string in the list causes that + string to be returned. +*/ + +/*! + Returns a model index for other component to use when referencing the + item specified by the given row, column, and type. The parent index + is ignored. +*/ + +QModelIndex LinearModel::index(int row, int column, const QModelIndex &parent) const +{ + if (parent == QModelIndex() && row >= 0 && row < rowCount() + && column == 0) + return createIndex(row, column, 0); + else + return QModelIndex(); +} + +QVariant LinearModel::data(const QModelIndex &index, int role) const +{ + Q_UNUSED(role); + + if (!index.isValid()) + return QVariant(); + + return values.at(index.row()); +} + +/*! + Returns Qt::ItemIsEditable so that all items in the vector can be edited. +*/ + +Qt::ItemFlags LinearModel::flags(const QModelIndex &index) const +{ + // all items in the model are editable + return QAbstractListModel::flags(index) | Qt::ItemIsEditable; +} + +/*! + Changes an item in the string list, but only if the following conditions + are met: + + * The index supplied is valid. + * The index corresponds to an item to be shown in a view. + * The role associated with editing text is specified. + + The dataChanged() signal is emitted if the item is changed. +*/ + +bool LinearModel::setData(const QModelIndex &index, + const QVariant &value, int role) +{ + if (!index.isValid() || role != Qt::EditRole) + return false; + values.replace(index.row(), value.toInt()); + emit dataChanged(index, index); + return true; +} + +/*! + Inserts a number of rows into the model at the specified position. +*/ + +bool LinearModel::insertRows(int position, int rows, const QModelIndex &parent) +{ + beginInsertRows(parent, position, position + rows - 1); + + values.insert(position, rows, 0); + + endInsertRows(); + return true; +} + +/*! + Removes a number of rows from the model at the specified position. +*/ + +bool LinearModel::removeRows(int position, int rows, const QModelIndex &parent) +{ + beginRemoveRows(QModelIndex(), position, position+rows-1); + + values.remove(position, rows); + + endRemoveRows(); + return true; +} |