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<h1 class="title">filetree.cpp Example File</h1>
<span class="subtitle">filetree/filetree.cpp</span>
<!-- $$$filetree/filetree.cpp-description -->
<div class="descr"> <a name="details"></a>
<pre class="cpp"><span class="comment">/****************************************************************************
**
** Copyright (C) 2015 The Qt Company Ltd.
** Contact: http://www.qt.io/licensing/
**
** This file is part of the examples of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:BSD$
** You may use this file under the terms of the BSD license as follows:
**
** &quot;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.
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**     the documentation and/or other materials provided with the
**     distribution.
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**     contributors may be used to endorse or promote products derived
**     from this software without specific prior written permission.
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****************************************************************************/</span>

<span class="preprocessor">#include &lt;QtCore/QUrl&gt;</span>
<span class="preprocessor">#include &lt;QtCore/QVariant&gt;</span>
<span class="preprocessor">#include &lt;QtXmlPatterns/QXmlNamePool&gt;</span>
<span class="preprocessor">#include &quot;filetree.h&quot;</span>

<span class="comment">/*
The model has two types of nodes: elements &amp; attributes.

    &lt;directory name=&quot;&quot;&gt;
        &lt;file name=&quot;&quot;&gt;
        &lt;/file&gt;
    &lt;/directory&gt;

  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 &quot;file&quot;, &quot;directory&quot;, &quot;fileName&quot;, &quot;filePath&quot;, &quot;size&quot;,
  &quot;mimeType&quot;, and &quot;suffix&quot;.
 */</span>
FileTree<span class="operator">::</span>FileTree(<span class="keyword">const</span> <span class="type"><a href="qxmlnamepool.html">QXmlNamePool</a></span><span class="operator">&amp;</span> pool)
  : <span class="type"><a href="qsimplexmlnodemodel.html">QSimpleXmlNodeModel</a></span>(pool)<span class="operator">,</span>
    m_filterAllowAll(<span class="type">QDir</span><span class="operator">::</span>AllEntries <span class="operator">|</span>
                     <span class="type">QDir</span><span class="operator">::</span>AllDirs <span class="operator">|</span>
                     <span class="type">QDir</span><span class="operator">::</span>NoDotAndDotDot <span class="operator">|</span>
                     <span class="type">QDir</span><span class="operator">::</span>Hidden)<span class="operator">,</span>
    m_sortFlags(<span class="type">QDir</span><span class="operator">::</span>Name)
{
    <span class="type"><a href="qxmlnamepool.html">QXmlNamePool</a></span> np <span class="operator">=</span> namePool();
    m_names<span class="operator">.</span>resize(<span class="number">7</span>);
    m_names<span class="operator">[</span>File<span class="operator">]</span>               <span class="operator">=</span> <span class="type"><a href="qxmlname.html">QXmlName</a></span>(np<span class="operator">,</span> QLatin1String(<span class="string">&quot;file&quot;</span>));
    m_names<span class="operator">[</span>Directory<span class="operator">]</span>          <span class="operator">=</span> <span class="type"><a href="qxmlname.html">QXmlName</a></span>(np<span class="operator">,</span> QLatin1String(<span class="string">&quot;directory&quot;</span>));
    m_names<span class="operator">[</span>AttributeFileName<span class="operator">]</span>  <span class="operator">=</span> <span class="type"><a href="qxmlname.html">QXmlName</a></span>(np<span class="operator">,</span> QLatin1String(<span class="string">&quot;fileName&quot;</span>));
    m_names<span class="operator">[</span>AttributeFilePath<span class="operator">]</span>  <span class="operator">=</span> <span class="type"><a href="qxmlname.html">QXmlName</a></span>(np<span class="operator">,</span> QLatin1String(<span class="string">&quot;filePath&quot;</span>));
    m_names<span class="operator">[</span>AttributeSize<span class="operator">]</span>      <span class="operator">=</span> <span class="type"><a href="qxmlname.html">QXmlName</a></span>(np<span class="operator">,</span> QLatin1String(<span class="string">&quot;size&quot;</span>));
    m_names<span class="operator">[</span>AttributeMIMEType<span class="operator">]</span>  <span class="operator">=</span> <span class="type"><a href="qxmlname.html">QXmlName</a></span>(np<span class="operator">,</span> QLatin1String(<span class="string">&quot;mimeType&quot;</span>));
    m_names<span class="operator">[</span>AttributeSuffix<span class="operator">]</span>    <span class="operator">=</span> <span class="type"><a href="qxmlname.html">QXmlName</a></span>(np<span class="operator">,</span> QLatin1String(<span class="string">&quot;suffix&quot;</span>));
}

<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>
<span class="type"><a href="qxmlnodemodelindex.html">QXmlNodeModelIndex</a></span> FileTree<span class="operator">::</span>nodeFor(<span class="keyword">const</span> <span class="type">QString</span><span class="operator">&amp;</span> dirName) <span class="keyword">const</span>
{
    <span class="type">QFileInfo</span> dirInfo(<span class="type">QDir</span><span class="operator">::</span>cleanPath(dirName));
    Q_ASSERT(dirInfo<span class="operator">.</span>exists());
    <span class="keyword">return</span> 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>
<span class="keyword">const</span> <span class="type">QFileInfo</span><span class="operator">&amp;</span>
FileTree<span class="operator">::</span>toFileInfo(<span class="keyword">const</span> <span class="type"><a href="qxmlnodemodelindex.html">QXmlNodeModelIndex</a></span> <span class="operator">&amp;</span>nodeIndex) <span class="keyword">const</span>
{
    <span class="keyword">return</span> m_fileInfos<span class="operator">.</span>at(nodeIndex<span class="operator">.</span>data());
}

<span class="comment">/*!
  Returns the model node index for the node specified by the
  QFileInfo and node Type.
 */</span>
<span class="type"><a href="qxmlnodemodelindex.html">QXmlNodeModelIndex</a></span>
FileTree<span class="operator">::</span>toNodeIndex(<span class="keyword">const</span> <span class="type">QFileInfo</span> <span class="operator">&amp;</span>fileInfo<span class="operator">,</span> Type attributeName) <span class="keyword">const</span>
{
    <span class="keyword">const</span> <span class="type">int</span> indexOf <span class="operator">=</span> m_fileInfos<span class="operator">.</span>indexOf(fileInfo);

    <span class="keyword">if</span> (indexOf <span class="operator">=</span><span class="operator">=</span> <span class="operator">-</span><span class="number">1</span>) {
        m_fileInfos<span class="operator">.</span>append(fileInfo);
        <span class="keyword">return</span> createIndex(m_fileInfos<span class="operator">.</span>count()<span class="operator">-</span><span class="number">1</span><span class="operator">,</span> attributeName);
    }
    <span class="keyword">else</span>
        <span class="keyword">return</span> createIndex(indexOf<span class="operator">,</span> 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>
<span class="type"><a href="qxmlnodemodelindex.html">QXmlNodeModelIndex</a></span> FileTree<span class="operator">::</span>toNodeIndex(<span class="keyword">const</span> <span class="type">QFileInfo</span> <span class="operator">&amp;</span>fileInfo) <span class="keyword">const</span>
{
    <span class="keyword">return</span> toNodeIndex(fileInfo<span class="operator">,</span> fileInfo<span class="operator">.</span>isDir() <span class="operator">?</span> 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>
<span class="type"><a href="qxmlnodemodelindex.html">QXmlNodeModelIndex</a></span> FileTree<span class="operator">::</span>nextSibling(<span class="keyword">const</span> <span class="type"><a href="qxmlnodemodelindex.html">QXmlNodeModelIndex</a></span> <span class="operator">&amp;</span>nodeIndex<span class="operator">,</span>
                                         <span class="keyword">const</span> <span class="type">QFileInfo</span> <span class="operator">&amp;</span>fileInfo<span class="operator">,</span>
                                         <span class="type">qint8</span> offset) <span class="keyword">const</span>
{
    Q_ASSERT(offset <span class="operator">=</span><span class="operator">=</span> <span class="operator">-</span><span class="number">1</span> <span class="operator">|</span><span class="operator">|</span> offset <span class="operator">=</span><span class="operator">=</span> <span class="number">1</span>);

    <span class="comment">// Get the context node's parent.</span>
    <span class="keyword">const</span> <span class="type"><a href="qxmlnodemodelindex.html">QXmlNodeModelIndex</a></span> parent(nextFromSimpleAxis(Parent<span class="operator">,</span> nodeIndex));

    <span class="keyword">if</span> (parent<span class="operator">.</span>isNull())
        <span class="keyword">return</span> <span class="type"><a href="qxmlnodemodelindex.html">QXmlNodeModelIndex</a></span>();

    <span class="comment">// Get the parent's child list.</span>
    <span class="keyword">const</span> <span class="type">QFileInfo</span> parentFI(toFileInfo(parent));
    Q_ASSERT(Type(parent<span class="operator">.</span>additionalData()) <span class="operator">=</span><span class="operator">=</span> Directory);
    <span class="keyword">const</span> <span class="type">QFileInfoList</span> siblings(<span class="type">QDir</span>(parentFI<span class="operator">.</span>absoluteFilePath())<span class="operator">.</span>entryInfoList(<span class="type">QStringList</span>()<span class="operator">,</span>
                                                                                 m_filterAllowAll<span class="operator">,</span>
                                                                                 m_sortFlags));
    Q_ASSERT_X(<span class="operator">!</span>siblings<span class="operator">.</span>isEmpty()<span class="operator">,</span> Q_FUNC_INFO<span class="operator">,</span> <span class="string">&quot;Can't happen! We started at a child.&quot;</span>);

    <span class="comment">// Find the index of the child where we started.</span>
    <span class="keyword">const</span> <span class="type">int</span> indexOfMe <span class="operator">=</span> siblings<span class="operator">.</span>indexOf(fileInfo);

    <span class="comment">// Apply the offset.</span>
    <span class="keyword">const</span> <span class="type">int</span> siblingIndex <span class="operator">=</span> indexOfMe <span class="operator">+</span> offset;
    <span class="keyword">if</span> (siblingIndex <span class="operator">&lt;</span> <span class="number">0</span> <span class="operator">|</span><span class="operator">|</span> siblingIndex <span class="operator">&gt;</span> siblings<span class="operator">.</span>count() <span class="operator">-</span> <span class="number">1</span>)
        <span class="keyword">return</span> <span class="type"><a href="qxmlnodemodelindex.html">QXmlNodeModelIndex</a></span>();
    <span class="keyword">else</span>
        <span class="keyword">return</span> toNodeIndex(siblings<span class="operator">.</span>at(siblingIndex));
}

<span class="comment">/*!
  This function is called by the Qt XML Patterns 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>
<span class="type"><a href="qxmlnodemodelindex.html">QXmlNodeModelIndex</a></span>
FileTree<span class="operator">::</span>nextFromSimpleAxis(SimpleAxis axis<span class="operator">,</span> <span class="keyword">const</span> <span class="type"><a href="qxmlnodemodelindex.html">QXmlNodeModelIndex</a></span> <span class="operator">&amp;</span>nodeIndex) <span class="keyword">const</span>
{
    <span class="keyword">const</span> <span class="type">QFileInfo</span> fi(toFileInfo(nodeIndex));
    <span class="keyword">const</span> Type type <span class="operator">=</span> Type(nodeIndex<span class="operator">.</span>additionalData());

    <span class="keyword">if</span> (type <span class="operator">!</span><span class="operator">=</span> File <span class="operator">&amp;</span><span class="operator">&amp;</span> type <span class="operator">!</span><span class="operator">=</span> Directory) {
        Q_ASSERT_X(axis <span class="operator">=</span><span class="operator">=</span> Parent<span class="operator">,</span> Q_FUNC_INFO<span class="operator">,</span> <span class="string">&quot;An attribute only has a parent!&quot;</span>);
        <span class="keyword">return</span> toNodeIndex(fi<span class="operator">,</span> Directory);
    }

    <span class="keyword">switch</span> (axis) {
        <span class="keyword">case</span> Parent:
            <span class="keyword">return</span> toNodeIndex(<span class="type">QFileInfo</span>(fi<span class="operator">.</span>path())<span class="operator">,</span> Directory);

        <span class="keyword">case</span> FirstChild:
        {
            <span class="keyword">if</span> (type <span class="operator">=</span><span class="operator">=</span> File) <span class="comment">// A file has no children.</span>
                <span class="keyword">return</span> <span class="type"><a href="qxmlnodemodelindex.html">QXmlNodeModelIndex</a></span>();
            <span class="keyword">else</span> {
                Q_ASSERT(type <span class="operator">=</span><span class="operator">=</span> Directory);
                Q_ASSERT_X(fi<span class="operator">.</span>isDir()<span class="operator">,</span> Q_FUNC_INFO<span class="operator">,</span> <span class="string">&quot;It isn't really a directory!&quot;</span>);
                <span class="keyword">const</span> <span class="type">QDir</span> dir(fi<span class="operator">.</span>absoluteFilePath());
                Q_ASSERT(dir<span class="operator">.</span>exists());

                <span class="keyword">const</span> <span class="type">QFileInfoList</span> children(dir<span class="operator">.</span>entryInfoList(<span class="type">QStringList</span>()<span class="operator">,</span>
                                                               m_filterAllowAll<span class="operator">,</span>
                                                               m_sortFlags));
                <span class="keyword">if</span> (children<span class="operator">.</span>isEmpty())
                    <span class="keyword">return</span> <span class="type"><a href="qxmlnodemodelindex.html">QXmlNodeModelIndex</a></span>();
                <span class="keyword">const</span> <span class="type">QFileInfo</span> firstChild(children<span class="operator">.</span>first());
                <span class="keyword">return</span> toNodeIndex(firstChild);
            }
        }

        <span class="keyword">case</span> PreviousSibling:
            <span class="keyword">return</span> nextSibling(nodeIndex<span class="operator">,</span> fi<span class="operator">,</span> <span class="operator">-</span><span class="number">1</span>);

        <span class="keyword">case</span> NextSibling:
            <span class="keyword">return</span> nextSibling(nodeIndex<span class="operator">,</span> fi<span class="operator">,</span> <span class="number">1</span>);
    }

    Q_ASSERT_X(<span class="keyword">false</span><span class="operator">,</span> Q_FUNC_INFO<span class="operator">,</span> <span class="string">&quot;Don't ever get here!&quot;</span>);
    <span class="keyword">return</span> <span class="type"><a href="qxmlnodemodelindex.html">QXmlNodeModelIndex</a></span>();
}

<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>
<span class="type">QUrl</span> FileTree<span class="operator">::</span>documentUri(<span class="keyword">const</span> <span class="type"><a href="qxmlnodemodelindex.html">QXmlNodeModelIndex</a></span> <span class="operator">&amp;</span>node) <span class="keyword">const</span>
{
    Q_UNUSED(node);
    <span class="keyword">return</span> <span class="type">QUrl</span>(<span class="string">&quot;file:///&quot;</span>);
}

<span class="comment">/*!
  This function returns QXmlNodeModelIndex::Element if \a node
  is a directory or a file, and QXmlNodeModelIndex::Attribute
  otherwise.
 */</span>
<span class="type"><a href="qxmlnodemodelindex.html">QXmlNodeModelIndex</a></span><span class="operator">::</span>NodeKind
FileTree<span class="operator">::</span>kind(<span class="keyword">const</span> <span class="type"><a href="qxmlnodemodelindex.html">QXmlNodeModelIndex</a></span> <span class="operator">&amp;</span>node) <span class="keyword">const</span>
{
    <span class="keyword">switch</span> (Type(node<span class="operator">.</span>additionalData())) {
        <span class="keyword">case</span> Directory:
        <span class="keyword">case</span> File:
            <span class="keyword">return</span> <span class="type"><a href="qxmlnodemodelindex.html">QXmlNodeModelIndex</a></span><span class="operator">::</span>Element;
        <span class="keyword">default</span>:
            <span class="keyword">return</span> <span class="type"><a href="qxmlnodemodelindex.html">QXmlNodeModelIndex</a></span><span class="operator">::</span>Attribute;
    }
}

<span class="comment">/*!
  No order is defined for this example, so we always return
  QXmlNodeModelIndex::Is, just to keep everyone happy.
 */</span>
<span class="type"><a href="qxmlnodemodelindex.html">QXmlNodeModelIndex</a></span><span class="operator">::</span>DocumentOrder
FileTree<span class="operator">::</span>compareOrder(<span class="keyword">const</span> <span class="type"><a href="qxmlnodemodelindex.html">QXmlNodeModelIndex</a></span><span class="operator">&amp;</span><span class="operator">,</span>
                       <span class="keyword">const</span> <span class="type"><a href="qxmlnodemodelindex.html">QXmlNodeModelIndex</a></span><span class="operator">&amp;</span>) <span class="keyword">const</span>
{
    <span class="keyword">return</span> <span class="type"><a href="qxmlnodemodelindex.html">QXmlNodeModelIndex</a></span><span class="operator">::</span>Is;
}

<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>
<span class="type"><a href="qxmlname.html">QXmlName</a></span> FileTree<span class="operator">::</span>name(<span class="keyword">const</span> <span class="type"><a href="qxmlnodemodelindex.html">QXmlNodeModelIndex</a></span> <span class="operator">&amp;</span>node) <span class="keyword">const</span>
{
    <span class="keyword">return</span> m_names<span class="operator">.</span>at(node<span class="operator">.</span>additionalData());
}

<span class="comment">/*!
  Always returns the QXmlNodeModelIndex for the root of the
  file system, i.e. &quot;/&quot;.
 */</span>
<span class="type"><a href="qxmlnodemodelindex.html">QXmlNodeModelIndex</a></span> FileTree<span class="operator">::</span>root(<span class="keyword">const</span> <span class="type"><a href="qxmlnodemodelindex.html">QXmlNodeModelIndex</a></span> <span class="operator">&amp;</span>node) <span class="keyword">const</span>
{
    Q_UNUSED(node);
    <span class="keyword">return</span> toNodeIndex(<span class="type">QFileInfo</span>(QLatin1String(<span class="string">&quot;/&quot;</span>)));
}

<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>
<span class="type">QVariant</span> FileTree<span class="operator">::</span>typedValue(<span class="keyword">const</span> <span class="type"><a href="qxmlnodemodelindex.html">QXmlNodeModelIndex</a></span> <span class="operator">&amp;</span>node) <span class="keyword">const</span>
{
    <span class="keyword">const</span> <span class="type">QFileInfo</span> <span class="operator">&amp;</span>fi <span class="operator">=</span> toFileInfo(node);

    <span class="keyword">switch</span> (Type(node<span class="operator">.</span>additionalData())) {
        <span class="keyword">case</span> Directory:
            <span class="comment">// deliberate fall through.</span>
        <span class="keyword">case</span> File:
            <span class="keyword">return</span> <span class="type">QString</span>();
        <span class="keyword">case</span> AttributeFileName:
            <span class="keyword">return</span> fi<span class="operator">.</span>fileName();
        <span class="keyword">case</span> AttributeFilePath:
            <span class="keyword">return</span> fi<span class="operator">.</span>filePath();
        <span class="keyword">case</span> AttributeSize:
            <span class="keyword">return</span> fi<span class="operator">.</span>size();
        <span class="keyword">case</span> AttributeMIMEType:
            {
                <span class="comment">/* We don't have any MIME detection code currently, so return
                 * the most generic one. */</span>
                <span class="keyword">return</span> QLatin1String(<span class="string">&quot;application/octet-stream&quot;</span>);
            }
        <span class="keyword">case</span> AttributeSuffix:
            <span class="keyword">return</span> fi<span class="operator">.</span>suffix();
    }

    Q_ASSERT_X(<span class="keyword">false</span><span class="operator">,</span> Q_FUNC_INFO<span class="operator">,</span> <span class="string">&quot;This line should never be reached.&quot;</span>);
    <span class="keyword">return</span> <span class="type">QString</span>();
}

<span class="comment">/*!
  Returns the attributes of \a element. The caller guarantees
  that \a element is an element in this node model.
 */</span>
<span class="type">QVector</span><span class="operator">&lt;</span><span class="type"><a href="qxmlnodemodelindex.html">QXmlNodeModelIndex</a></span><span class="operator">&gt;</span>
FileTree<span class="operator">::</span>attributes(<span class="keyword">const</span> <span class="type"><a href="qxmlnodemodelindex.html">QXmlNodeModelIndex</a></span> <span class="operator">&amp;</span>element) <span class="keyword">const</span>
{
    <span class="type">QVector</span><span class="operator">&lt;</span><span class="type"><a href="qxmlnodemodelindex.html">QXmlNodeModelIndex</a></span><span class="operator">&gt;</span> result;

    <span class="comment">/* Both elements has this attribute. */</span>
    <span class="keyword">const</span> <span class="type">QFileInfo</span> <span class="operator">&amp;</span>forElement <span class="operator">=</span> toFileInfo(element);
    result<span class="operator">.</span>append(toNodeIndex(forElement<span class="operator">,</span> AttributeFilePath));
    result<span class="operator">.</span>append(toNodeIndex(forElement<span class="operator">,</span> AttributeFileName));

    <span class="keyword">if</span> (Type(element<span class="operator">.</span>additionalData() <span class="operator">=</span><span class="operator">=</span> File)) {
        result<span class="operator">.</span>append(toNodeIndex(forElement<span class="operator">,</span> AttributeSize));
        result<span class="operator">.</span>append(toNodeIndex(forElement<span class="operator">,</span> AttributeSuffix));
        <span class="comment">//result.append(toNodeIndex(forElement, AttributeMIMEType));</span>
    }
    <span class="keyword">else</span> {
        Q_ASSERT(element<span class="operator">.</span>additionalData() <span class="operator">=</span><span class="operator">=</span> Directory);
    }

    <span class="keyword">return</span> result;
}</pre>
</div>
<!-- @@@filetree/filetree.cpp -->
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