Page item model basics

Pdf4QtDocPageOrganizer/pageitemmodel.cpp

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+//    Copyright (C) 2021 Jakub Melka
+//
+//    This file is part of Pdf4Qt.
+//
+//    Pdf4Qt is free software: you can redistribute it and/or modify
+//    it under the terms of the GNU Lesser General Public License as published by
+//    the Free Software Foundation, either version 3 of the License, or
+//    with the written consent of the copyright owner, any later version.
+//
+//    Pdf4Qt 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 Lesser General Public License for more details.
+//
+//    You should have received a copy of the GNU Lesser General Public License
+//    along with Pdf4Qt.  If not, see <https://www.gnu.org/licenses/>.
+
+#include "pageitemmodel.h"
+
+#include <QFileInfo>
+
+namespace pdfdocpage
+{
+
+PageItemModel::PageItemModel(QObject* parent) :
+    QAbstractItemModel(parent)
+{
+}
+
+QVariant PageItemModel::headerData(int section, Qt::Orientation orientation, int role) const
+{
+    Q_UNUSED(section);
+    Q_UNUSED(orientation);
+    Q_UNUSED(role);
+
+    return QVariant();
+}
+
+QModelIndex PageItemModel::index(int row, int column, const QModelIndex& parent) const
+{
+    if (hasIndex(row, column, parent))
+    {
+        return createIndex(row, column, nullptr);
+    }
+
+    return QModelIndex();
+}
+
+QModelIndex PageItemModel::parent(const QModelIndex& index) const
+{
+    Q_UNUSED(index);
+
+    return QModelIndex();
+}
+
+int PageItemModel::rowCount(const QModelIndex& parent) const
+{
+    if (!parent.isValid())
+    {
+        return 0;
+    }
+
+    return int(m_pageGroupItems.size());
+}
+
+int PageItemModel::columnCount(const QModelIndex& parent) const
+{
+    if (!parent.isValid())
+    {
+        return 0;
+    }
+
+    return 1;
+}
+
+QVariant PageItemModel::data(const QModelIndex& index, int role) const
+{
+    if (!index.isValid())
+    {
+        return QVariant();
+    }
+
+    switch (role)
+    {
+        case Qt::DisplayRole:
+            return m_pageGroupItems.at(index.row()).groupName;
+
+        default:
+            break;
+    }
+
+    return QVariant();
+}
+
+int PageItemModel::addDocument(QString fileName, pdf::PDFDocument document)
+{
+    auto it = std::find_if(m_documents.cbegin(), m_documents.cend(), [&](const auto& item) { return item.second.fileName == fileName; });
+    if (it != m_documents.cend())
+    {
+        return -1;
+    }
+
+    int newIndex = 1;
+
+    if (!m_documents.empty())
+    {
+        newIndex = (m_documents.rbegin()->first) + 1;
+    }
+
+    m_documents[newIndex] = { qMove(fileName), qMove(document) };
+    createDocumentGroup(newIndex);
+    return newIndex;
+}
+
+void PageItemModel::createDocumentGroup(int index)
+{
+    const DocumentItem& item = m_documents.at(index);
+    const pdf::PDFInteger pageCount = item.document.getCatalog()->getPageCount();
+    pdf::PDFClosedIntervalSet pageSet;
+    pageSet.addInterval(1, pageCount);
+
+    PageGroupItem newItem;
+    newItem.groupName = getGroupNameFromDocument(index);
+    newItem.pagesCaption = pageSet.toText(true);
+
+    if (pageCount > 1)
+    {
+        newItem.tags = QStringList() << QString("0x00FF00@+%1").arg(pageCount - 1);
+    }
+
+    newItem.groups.reserve(pageCount);
+    for (pdf::PDFInteger i = 1; i <= pageCount; ++i)
+    {
+        PageGroupItem::GroupItem groupItem;
+        groupItem.documentIndex = index;
+        groupItem.pageIndex = i;
+        groupItem.rotatedPageDimensionsMM = item.document.getCatalog()->getPage(i)->getRotatedMediaBoxMM().size();
+        newItem.groups.push_back(qMove(groupItem));
+    }
+
+    beginInsertRows(QModelIndex(), rowCount(QModelIndex()), rowCount(QModelIndex()));
+    m_pageGroupItems.push_back(qMove(newItem));
+    endInsertRows();
+}
+
+QString PageItemModel::getGroupNameFromDocument(int index) const
+{
+    const DocumentItem& item = m_documents.at(index);
+
+    QString title = item.document.getInfo()->title;
+    if (!title.isEmpty())
+    {
+        return title;
+    }
+
+    QFileInfo fileInfo(item.fileName);
+    return fileInfo.fileName();
+}
+
+}   // namespace pdfdocpage