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<pre><span class="comment"> /****************************************************************************
**
** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the examples of the Qt Toolkit.
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#include <QtCore/QUrl>
#include <QtCore/QVariant>
#include <QtXmlPatterns/QXmlNamePool>
#include "filetree.h"
<span class="comment"> /*
The model has two types of nodes: elements & attributes.
<directory name="">
<file name="">
</file>
</directory>
In QXmlNodeModelIndex we store two values. QXmlNodeIndex::data()
is treated as a signed int, and it is an index into m_fileInfos
unless it is -1, in which case it has no meaning and the value
of QXmlNodeModelIndex::additionalData() is a Type name instead.
*/</span>
<span class="comment"> /*!
The constructor passes \a pool to the base class, then loads an
internal vector with an instance of QXmlName for each of the
strings "file", "directory", "fileName", "filePath", "size",
"mimeType", and "suffix".
*/</span>
FileTree::FileTree(const QXmlNamePool& pool)
: QSimpleXmlNodeModel(pool),
m_filterAllowAll(QDir::AllEntries |
QDir::AllDirs |
QDir::NoDotAndDotDot |
QDir::Hidden),
m_sortFlags(QDir::Name)
{
QXmlNamePool np = namePool();
m_names.resize(7);
m_names[File] = QXmlName(np, QLatin1String("file"));
m_names[Directory] = QXmlName(np, QLatin1String("directory"));
m_names[AttributeFileName] = QXmlName(np, QLatin1String("fileName"));
m_names[AttributeFilePath] = QXmlName(np, QLatin1String("filePath"));
m_names[AttributeSize] = QXmlName(np, QLatin1String("size"));
m_names[AttributeMIMEType] = QXmlName(np, QLatin1String("mimeType"));
m_names[AttributeSuffix] = QXmlName(np, QLatin1String("suffix"));
}
<span class="comment"> /*!
Returns the QXmlNodeModelIndex for the model node representing
the directory \a dirName.
It calls QDir::cleanPath(), because an instance of QFileInfo
constructed for a path ending in '/' will return the empty string in
fileName(), instead of the directory name.
*/</span>
QXmlNodeModelIndex FileTree::nodeFor(const QString& dirName) const
{
QFileInfo dirInfo(QDir::cleanPath(dirName));
Q_ASSERT(dirInfo.exists());
return toNodeIndex(dirInfo);
}
<span class="comment"> /*!
Since the value will always be in m_fileInfos, it is safe for
us to return a const reference to it.
*/</span>
const QFileInfo&
FileTree::toFileInfo(const QXmlNodeModelIndex &nodeIndex) const
{
return m_fileInfos.at(nodeIndex.data());
}
<span class="comment"> /*!
Returns the model node index for the node specified by the
QFileInfo and node Type.
*/</span>
QXmlNodeModelIndex
FileTree::toNodeIndex(const QFileInfo &fileInfo, Type attributeName) const
{
const int indexOf = m_fileInfos.indexOf(fileInfo);
if (indexOf == -1) {
m_fileInfos.append(fileInfo);
return createIndex(m_fileInfos.count()-1, attributeName);
}
else
return createIndex(indexOf, attributeName);
}
<span class="comment"> /*!
Returns the model node index for the node specified by the
QFileInfo, which must be a Type::File or Type::Directory.
*/</span>
QXmlNodeModelIndex FileTree::toNodeIndex(const QFileInfo &fileInfo) const
{
return toNodeIndex(fileInfo, fileInfo.isDir() ? Directory : File);
}
<span class="comment"> /*!
This private helper function is only called by nextFromSimpleAxis().
It is called whenever nextFromSimpleAxis() is called with an axis
parameter of either \c{PreviousSibling} or \c{NextSibling}.
*/</span>
QXmlNodeModelIndex FileTree::nextSibling(const QXmlNodeModelIndex &nodeIndex,
const QFileInfo &fileInfo,
qint8 offset) const
{
Q_ASSERT(offset == -1 || offset == 1);
<span class="comment">// Get the context node's parent.</span>
const QXmlNodeModelIndex parent(nextFromSimpleAxis(Parent, nodeIndex));
if (parent.isNull())
return QXmlNodeModelIndex();
<span class="comment">// Get the parent's child list.</span>
const QFileInfo parentFI(toFileInfo(parent));
Q_ASSERT(Type(parent.additionalData()) == Directory);
const QFileInfoList siblings(QDir(parentFI.absoluteFilePath()).entryInfoList(QStringList(),
m_filterAllowAll,
m_sortFlags));
Q_ASSERT_X(!siblings.isEmpty(), Q_FUNC_INFO, "Can't happen! We started at a child.");
<span class="comment">// Find the index of the child where we started.</span>
const int indexOfMe = siblings.indexOf(fileInfo);
<span class="comment">// Apply the offset.</span>
const int siblingIndex = indexOfMe + offset;
if (siblingIndex < 0 || siblingIndex > siblings.count() - 1)
return QXmlNodeModelIndex();
else
return toNodeIndex(siblings.at(siblingIndex));
}
<span class="comment"> /*!
This function is called by the QtXmlPatterns query engine when it
wants to move to the next node in the model. It moves along an \a
axis, \e from the node specified by \a nodeIndex.
This function is usually the one that requires the most design and
implementation work, because the implementation depends on the
perhaps unique structure of your non-XML data.
There are \l {QAbstractXmlNodeModel::SimpleAxis} {four values} for
\a axis that the implementation must handle, but there are really
only two axes, i.e., vertical and horizontal. Two of the four values
specify direction on the vertical axis (\c{Parent} and
\c{FirstChild}), and the other two values specify direction on the
horizontal axis (\c{PreviousSibling} and \c{NextSibling}).
The typical implementation will be a \c switch statement with
a case for each of the four \a axis values.
*/</span>
QXmlNodeModelIndex
FileTree::nextFromSimpleAxis(SimpleAxis axis, const QXmlNodeModelIndex &nodeIndex) const
{
const QFileInfo fi(toFileInfo(nodeIndex));
const Type type = Type(nodeIndex.additionalData());
if (type != File && type != Directory) {
Q_ASSERT_X(axis == Parent, Q_FUNC_INFO, "An attribute only has a parent!");
return toNodeIndex(fi, Directory);
}
switch (axis) {
case Parent:
return toNodeIndex(QFileInfo(fi.path()), Directory);
case FirstChild:
{
if (type == File) <span class="comment">// A file has no children.</span>
return QXmlNodeModelIndex();
else {
Q_ASSERT(type == Directory);
Q_ASSERT_X(fi.isDir(), Q_FUNC_INFO, "It isn't really a directory!");
const QDir dir(fi.absoluteFilePath());
Q_ASSERT(dir.exists());
const QFileInfoList children(dir.entryInfoList(QStringList(),
m_filterAllowAll,
m_sortFlags));
if (children.isEmpty())
return QXmlNodeModelIndex();
const QFileInfo firstChild(children.first());
return toNodeIndex(firstChild);
}
}
case PreviousSibling:
return nextSibling(nodeIndex, fi, -1);
case NextSibling:
return nextSibling(nodeIndex, fi, 1);
}
Q_ASSERT_X(false, Q_FUNC_INFO, "Don't ever get here!");
return QXmlNodeModelIndex();
}
<span class="comment"> /*!
No matter what part of the file system we model (the whole file
tree or a subtree), \a node will always have \c{file:///} as
the document URI.
*/</span>
QUrl FileTree::documentUri(const QXmlNodeModelIndex &node) const
{
Q_UNUSED(node);
return QUrl("file:<span class="comment">///");</span>
}
<span class="comment"> /*!
This function returns QXmlNodeModelIndex::Element if \a node
is a directory or a file, and QXmlNodeModelIndex::Attribute
otherwise.
*/</span>
QXmlNodeModelIndex::NodeKind
FileTree::kind(const QXmlNodeModelIndex &node) const
{
switch (Type(node.additionalData())) {
case Directory:
case File:
return QXmlNodeModelIndex::Element;
default:
return QXmlNodeModelIndex::Attribute;
}
}
<span class="comment"> /*!
No order is defined for this example, so we always return
QXmlNodeModelIndex::Precedes, just to keep everyone happy.
*/</span>
QXmlNodeModelIndex::DocumentOrder
FileTree::compareOrder(const QXmlNodeModelIndex&,
const QXmlNodeModelIndex&) const
{
return QXmlNodeModelIndex::Precedes;
}
<span class="comment"> /*!
Returns the name of \a node. The caller guarantees that \a node is
not null and that it is contained in this node model.
*/</span>
QXmlName FileTree::name(const QXmlNodeModelIndex &node) const
{
return m_names.at(node.additionalData());
}
<span class="comment"> /*!
Always returns the QXmlNodeModelIndex for the root of the
file system, i.e. "/".
*/</span>
QXmlNodeModelIndex FileTree::root(const QXmlNodeModelIndex &node) const
{
Q_UNUSED(node);
return toNodeIndex(QFileInfo(QLatin1String("/")));
}
<span class="comment"> /*!
Returns the typed value for \a node, which must be either an
attribute or an element. The QVariant returned represents the atomic
value of an attribute or the atomic value contained in an element.
If the QVariant is returned as a default constructed variant,
it means that \a node has no typed value.
*/</span>
QVariant FileTree::typedValue(const QXmlNodeModelIndex &node) const
{
const QFileInfo &fi = toFileInfo(node);
switch (Type(node.additionalData())) {
case Directory:
<span class="comment">// deliberate fall through.</span>
case File:
return QString();
case AttributeFileName:
return fi.fileName();
case AttributeFilePath:
return fi.filePath();
case AttributeSize:
return fi.size();
case AttributeMIMEType:
{
<span class="comment">/* We don't have any MIME detection code currently, so return
* the most generic one. */</span>
return QLatin1String("application/octet-stream");
}
case AttributeSuffix:
return fi.suffix();
}
Q_ASSERT_X(false, Q_FUNC_INFO, "This line should never be reached.");
return QString();
}
<span class="comment"> /*!
Returns the attributes of \a element. The caller guarantees
that \a element is an element in this node model.
*/</span>
QVector<QXmlNodeModelIndex>
FileTree::attributes(const QXmlNodeModelIndex &element) const
{
QVector<QXmlNodeModelIndex> result;
<span class="comment">/* Both elements has this attribute. */</span>
const QFileInfo &forElement = toFileInfo(element);
result.append(toNodeIndex(forElement, AttributeFilePath));
result.append(toNodeIndex(forElement, AttributeFileName));
if (Type(element.additionalData() == File)) {
result.append(toNodeIndex(forElement, AttributeSize));
result.append(toNodeIndex(forElement, AttributeSuffix));
<span class="comment">//result.append(toNodeIndex(forElement, AttributeMIMEType));</span>
}
else {
Q_ASSERT(element.additionalData() == Directory);
}
return result;
}</pre>
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