mimetypemodel.cpp Example File

mimetypes/mimetypebrowser/mimetypemodel.cpp
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#include "mimetypemodel.h" #include <QIcon> #include <QDebug> #include <QMimeDatabase> #include <QTextStream> #include <QVariant> #include <algorithm> Q_DECLARE_METATYPE(QMimeType) typedef QList<QStandardItem *> StandardItemList; enum { mimeTypeRole = Qt::UserRole + 1, iconQueriedRole = Qt::UserRole + 2 }; bool operator<(const QMimeType &t1, const QMimeType &t2) { return t1.name() < t2.name(); } static StandardItemList createRow(const QMimeType &t) { const QVariant v = QVariant::fromValue(t); QStandardItem *nameItem = new QStandardItem(t.name()); const Qt::ItemFlags flags = Qt::ItemIsSelectable | Qt::ItemIsEnabled; nameItem->setData(v, mimeTypeRole); nameItem->setData(QVariant(false), iconQueriedRole); nameItem->setFlags(flags); nameItem->setToolTip(t.comment()); return StandardItemList{nameItem}; } MimetypeModel::MimetypeModel(QObject *parent) : QStandardItemModel(0, ColumnCount, parent) { setHorizontalHeaderLabels(QStringList{tr("Name")}); populate(); } QVariant MimetypeModel::data(const QModelIndex &index, int role) const { if (role != Qt::DecorationRole || !index.isValid() || index.data(iconQueriedRole).toBool()) return QStandardItemModel::data(index, role); QStandardItem *item = itemFromIndex(index); const QString iconName = item->data(mimeTypeRole).value<QMimeType>().iconName(); if (!iconName.isEmpty()) item->setIcon(QIcon::fromTheme(iconName)); item->setData(QVariant(true), iconQueriedRole); return item->icon(); } QMimeType MimetypeModel::mimeType(const QModelIndex &index) const { return index.data(mimeTypeRole).value<QMimeType>(); } void MimetypeModel::populate() { typedef QList<QMimeType>::Iterator Iterator; QMimeDatabase mimeDatabase; QList<QMimeType> allTypes = mimeDatabase.allMimeTypes(); // Move top level types to rear end of list, sort this partition, // create top level items and truncate the list. Iterator end = allTypes.end(); const Iterator topLevelStart = std::stable_partition(allTypes.begin(), end, [](const QMimeType &t) { return !t.parentMimeTypes().isEmpty(); }); std::stable_sort(topLevelStart, end); for (Iterator it = topLevelStart; it != end; ++it) { const StandardItemList row = createRow(*it); appendRow(row); m_nameIndexHash.insert(it->name(), indexFromItem(row.constFirst())); } allTypes.erase(topLevelStart, end); while (!allTypes.isEmpty()) { // Find a type inheriting one that is already in the model. end = allTypes.end(); auto nameIndexIt = m_nameIndexHash.constEnd(); for (Iterator it = allTypes.begin(); it != end; ++it) { nameIndexIt = m_nameIndexHash.constFind(it->parentMimeTypes().constFirst()); if (nameIndexIt != m_nameIndexHash.constEnd()) break; } if (nameIndexIt == m_nameIndexHash.constEnd()) { qWarning() << "Orphaned mime types:" << allTypes; break; } // Move types inheriting the parent type to rear end of list, sort this partition, // append the items to parent and truncate the list. const QString &parentName = nameIndexIt.key(); const Iterator start = std::stable_partition(allTypes.begin(), end, [parentName](const QMimeType &t) { return !t.parentMimeTypes().contains(parentName); }); std::stable_sort(start, end); QStandardItem *parentItem = itemFromIndex(nameIndexIt.value()); for (Iterator it = start; it != end; ++it) { const StandardItemList row = createRow(*it); parentItem->appendRow(row); m_nameIndexHash.insert(it->name(), indexFromItem(row.constFirst())); } allTypes.erase(start, end); } } QTextStream &operator<<(QTextStream &stream, const QStringList &list) { for (int i = 0, size = list.size(); i < size; ++i) { if (i) stream << ", "; stream << list.at(i); } return stream; } QString MimetypeModel::formatMimeTypeInfo(const QMimeType &t) { QString result; QTextStream str(&result); str << "<html><head/><body><h3><center>" << t.name() << "</center></h3><br><table>"; const QStringList &aliases = t.aliases(); if (!aliases.isEmpty()) str << "<tr><td>Aliases:</td><td>" << " (" << aliases << ')'; str << "</td></tr>" << "<tr><td>Comment:</td><td>" << t.comment() << "</td></tr>" << "<tr><td>Icon name:</td><td>" << t.iconName() << "</td></tr>" << "<tr><td>Generic icon name</td><td>" << t.genericIconName() << "</td></tr>"; const QString &filter = t.filterString(); if (!filter.isEmpty()) str << "<tr><td>Filter:</td><td>" << t.filterString() << "</td></tr>"; const QStringList &patterns = t.globPatterns(); if (!patterns.isEmpty()) str << "<tr><td>Glob patterns:</td><td>" << patterns << "</td></tr>"; const QStringList &parentMimeTypes = t.parentMimeTypes(); if (!parentMimeTypes.isEmpty()) str << "<tr><td>Parent types:</td><td>" << t.parentMimeTypes() << "</td></tr>"; QStringList suffixes = t.suffixes(); if (!suffixes.isEmpty()) { str << "<tr><td>Suffixes:</td><td>"; const QString &preferredSuffix = t.preferredSuffix(); if (!preferredSuffix.isEmpty()) { suffixes.removeOne(preferredSuffix); str << "<b>" << preferredSuffix << "</b> "; } str << suffixes << "</td></tr>"; } str << "</table></body></html>"; return result; }