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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<div class="navpath"><a class="el" href="namespaceWt.html">Wt</a>::<a class="el" href="classWt_1_1WModelIndex.html">WModelIndex</a>
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<h1>Wt::WModelIndex Class Reference<br>
<small>
[<a class="el" href="group__modelview.html">Model/view system</a>]</small>
</h1><!-- doxytag: class="Wt::WModelIndex" -->An index to a data item in a data model.
<a href="#_details">More...</a>
<p>
<code>#include <Wt/WModelIndex></code>
<p>
<p>
<a href="classWt_1_1WModelIndex-members.html">List of all members.</a><table border="0" cellpadding="0" cellspacing="0">
<tr><td></td></tr>
<tr><td colspan="2"><br><h2>Public Member Functions</h2></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"> </td><td class="memItemRight" valign="bottom"><a class="el" href="classWt_1_1WModelIndex.html#29431c83f8ed71654e213ec4aae21813">WModelIndex</a> ()</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Create an invalid <a class="el" href="classWt_1_1WModelIndex.html" title="An index to a data item in a data model.">WModelIndex</a>. <a href="#29431c83f8ed71654e213ec4aae21813"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="classWt_1_1WModelIndex.html#0e6568dd7113662c3c378e2084729581">column</a> () const </td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Returns the column for this model index. <a href="#0e6568dd7113662c3c378e2084729581"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="classWt_1_1WModelIndex.html#a4f1385223391c46ee200a57672f6046">row</a> () const </td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Returns the row for this model index. <a href="#a4f1385223391c46ee200a57672f6046"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">void * </td><td class="memItemRight" valign="bottom"><a class="el" href="classWt_1_1WModelIndex.html#44aabe692bba87ba144c1ab9a7f98eb3">internalPointer</a> () const </td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Returns the internal pointer. <a href="#44aabe692bba87ba144c1ab9a7f98eb3"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">uint64_t </td><td class="memItemRight" valign="bottom"><a class="el" href="classWt_1_1WModelIndex.html#f0fedac552dfeb6162f10d26d0876c85">internalId</a> () const </td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Returns the internal id. <a href="#f0fedac552dfeb6162f10d26d0876c85"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="el" href="classWt_1_1WModelIndex.html">WModelIndex</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="classWt_1_1WModelIndex.html#2c01a7ea6cbb423eec3f4d12f26324c7">child</a> (int row, int column) const </td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Returns a model index for a child item. <a href="#2c01a7ea6cbb423eec3f4d12f26324c7"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="el" href="classWt_1_1WModelIndex.html">WModelIndex</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="classWt_1_1WModelIndex.html#0e6380caae0e785fdea9e30e0a95eec9">parent</a> () const </td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Returns an index to the parent. <a href="#0e6380caae0e785fdea9e30e0a95eec9"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">boost::any </td><td class="memItemRight" valign="bottom"><a class="el" href="classWt_1_1WModelIndex.html#7f05920329ca4b7fdbb10931afdb634e">data</a> (int role=DisplayRole) const </td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Returns data in the model at this index. <a href="#7f05920329ca4b7fdbb10931afdb634e"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">WFlags< <a class="el" href="group__modelview.html#g1d77c4de293aebfacbdde124de06b8b0">ItemFlag</a> > </td><td class="memItemRight" valign="bottom"><a class="el" href="classWt_1_1WModelIndex.html#04877832f757772b8dc7e6b30fb3638c">flags</a> () const </td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Returns the flags for this item. <a href="#04877832f757772b8dc7e6b30fb3638c"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">bool </td><td class="memItemRight" valign="bottom"><a class="el" href="classWt_1_1WModelIndex.html#1d4b05ee51c5c6961d6123565fd77c82">isValid</a> () const </td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Returns whether the index is a real valid index. <a href="#1d4b05ee51c5c6961d6123565fd77c82"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">const <a class="el" href="classWt_1_1WAbstractItemModel.html">WAbstractItemModel</a> * </td><td class="memItemRight" valign="bottom"><a class="el" href="classWt_1_1WModelIndex.html#9fe91b75030a8a7373e3262fbbc6cad6">model</a> () const </td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Returns the model to which this (valid) index is bound. <a href="#9fe91b75030a8a7373e3262fbbc6cad6"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">bool </td><td class="memItemRight" valign="bottom"><a class="el" href="classWt_1_1WModelIndex.html#6bb6b3624c4d75e3a495860e46c04f9e">operator==</a> (const <a class="el" href="classWt_1_1WModelIndex.html">WModelIndex</a> &other) const </td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Comparison operator. <a href="#6bb6b3624c4d75e3a495860e46c04f9e"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">bool </td><td class="memItemRight" valign="bottom"><a class="el" href="classWt_1_1WModelIndex.html#ce2743acada845b3d4912e70c9787eac">operator!=</a> (const <a class="el" href="classWt_1_1WModelIndex.html">WModelIndex</a> &other) const </td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Comparison operator. <a href="#ce2743acada845b3d4912e70c9787eac"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">bool </td><td class="memItemRight" valign="bottom"><a class="el" href="classWt_1_1WModelIndex.html#29a0a0ab3e961b8087d95b7c62555cd1">operator<</a> (const <a class="el" href="classWt_1_1WModelIndex.html">WModelIndex</a> &other) const </td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Comparison operator. <a href="#29a0a0ab3e961b8087d95b7c62555cd1"></a><br></td></tr>
</table>
<hr><a name="_details"></a><h2>Detailed Description</h2>
An index to a data item in a data model.
<p>
Indexes are used to indicate a particular item in a <a class="el" href="classWt_1_1WAbstractItemModel.html" title="An abstract model for use with Wt's view classes.">WAbstractItemModel</a>. An index points to the item by identifying its row and column location within a parent model index.<p>
An index is immutable. The default constructor creates an <em>invalid index</em>, which by convention indicates the parent of top level indexes. Thus, a model that specifies only a list or table of data (but no hierarchical data) would have as valid indexes only indexes that specify the <em>invalid</em> model index as parent.<p>
Valid indexes are created by the model, within the protected <a class="el" href="classWt_1_1WAbstractItemModel.html#c837a73fe423255035ffb076946de122" title="Creates a model index for the given row and column.">WAbstractItemModel::createIndex()</a> methods. In this way, models can define an internal pointer or id suitable for identifying items in the model.<p>
Upon the model's choice, model indexes for hierarchical models may have an internal Id represented by a int64_t (<a class="el" href="classWt_1_1WModelIndex.html#f0fedac552dfeb6162f10d26d0876c85" title="Returns the internal id.">internalId()</a>), a pointer (<a class="el" href="classWt_1_1WModelIndex.html#44aabe692bba87ba144c1ab9a7f98eb3" title="Returns the internal pointer.">internalPointer()</a>).<p>
<dl class="see" compact><dt><b>See also:</b></dt><dd><a class="el" href="classWt_1_1WAbstractItemModel.html" title="An abstract model for use with Wt's view classes.">WAbstractItemModel</a> </dd></dl>
<hr><h2>Constructor & Destructor Documentation</h2>
<a class="anchor" name="29431c83f8ed71654e213ec4aae21813"></a><!-- doxytag: member="Wt::WModelIndex::WModelIndex" ref="29431c83f8ed71654e213ec4aae21813" args="()" -->
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<td class="memname">Wt::WModelIndex::WModelIndex </td>
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<p>
Create an invalid <a class="el" href="classWt_1_1WModelIndex.html" title="An index to a data item in a data model.">WModelIndex</a>.
<p>
Returns a model index for which <a class="el" href="classWt_1_1WModelIndex.html#1d4b05ee51c5c6961d6123565fd77c82" title="Returns whether the index is a real valid index.">isValid()</a> return <code>false</code>.
</div>
</div><p>
<hr><h2>Member Function Documentation</h2>
<a class="anchor" name="0e6568dd7113662c3c378e2084729581"></a><!-- doxytag: member="Wt::WModelIndex::column" ref="0e6568dd7113662c3c378e2084729581" args="() const " -->
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<td class="memname">int Wt::WModelIndex::column </td>
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<p>
Returns the column for this model index.
<p>
<dl class="see" compact><dt><b>See also:</b></dt><dd><a class="el" href="classWt_1_1WModelIndex.html#a4f1385223391c46ee200a57672f6046" title="Returns the row for this model index.">row()</a> </dd></dl>
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<a class="anchor" name="a4f1385223391c46ee200a57672f6046"></a><!-- doxytag: member="Wt::WModelIndex::row" ref="a4f1385223391c46ee200a57672f6046" args="() const " -->
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<td class="memname">int Wt::WModelIndex::row </td>
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<p>
Returns the row for this model index.
<p>
<dl class="see" compact><dt><b>See also:</b></dt><dd><a class="el" href="classWt_1_1WModelIndex.html#0e6568dd7113662c3c378e2084729581" title="Returns the column for this model index.">column()</a> </dd></dl>
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<a class="anchor" name="44aabe692bba87ba144c1ab9a7f98eb3"></a><!-- doxytag: member="Wt::WModelIndex::internalPointer" ref="44aabe692bba87ba144c1ab9a7f98eb3" args="() const " -->
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<td class="memname">void* Wt::WModelIndex::internalPointer </td>
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<p>
Returns the internal pointer.
<p>
The internal pointer is used by the model to retrieve the corresponding data.<p>
This is only defined when the model created the index using <a class="el" href="classWt_1_1WAbstractItemModel.html#c837a73fe423255035ffb076946de122" title="Creates a model index for the given row and column.">WAbstractItemModel::createIndex(int, int, void *) const</a>.<p>
<dl class="see" compact><dt><b>See also:</b></dt><dd><a class="el" href="classWt_1_1WModelIndex.html#f0fedac552dfeb6162f10d26d0876c85" title="Returns the internal id.">internalId()</a>, <p>
<a class="el" href="classWt_1_1WAbstractItemModel.html#c837a73fe423255035ffb076946de122" title="Creates a model index for the given row and column.">WAbstractItemModel::createIndex(int, int, void *) const</a> </dd></dl>
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<a class="anchor" name="f0fedac552dfeb6162f10d26d0876c85"></a><!-- doxytag: member="Wt::WModelIndex::internalId" ref="f0fedac552dfeb6162f10d26d0876c85" args="() const " -->
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<td class="memname">uint64_t Wt::WModelIndex::internalId </td>
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<p>
Returns the internal id.
<p>
The internal id is used by the model to retrieve the corresponding data.<p>
This is only defined when the model created the index using <a class="el" href="classWt_1_1WAbstractItemModel.html#ca9c0c10479b66b5f6742a9a31aa9e9f" title="Creates a model index for the given row and column.">WAbstractItemModel::createIndex(int, int, uint64_t) const</a>.<p>
<dl class="see" compact><dt><b>See also:</b></dt><dd><a class="el" href="classWt_1_1WModelIndex.html#44aabe692bba87ba144c1ab9a7f98eb3" title="Returns the internal pointer.">internalPointer()</a> <p>
<a class="el" href="classWt_1_1WAbstractItemModel.html#ca9c0c10479b66b5f6742a9a31aa9e9f" title="Creates a model index for the given row and column.">WAbstractItemModel::createIndex(int, int, uint64_t) const</a> </dd></dl>
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<a class="anchor" name="2c01a7ea6cbb423eec3f4d12f26324c7"></a><!-- doxytag: member="Wt::WModelIndex::child" ref="2c01a7ea6cbb423eec3f4d12f26324c7" args="(int row, int column) const " -->
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<td class="memname"><a class="el" href="classWt_1_1WModelIndex.html">WModelIndex</a> Wt::WModelIndex::child </td>
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<td class="paramtype">int </td>
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<p>
Returns a model index for a child item.
<p>
This is a convenience method, and is only defined for indexes that are valid().<p>
It has the same function as <a class="el" href="classWt_1_1WAbstractItemModel.html#83f37bf04b8574b328c139b02523b8cb" title="Returns the child index for the given row and column.">WAbstractItemModel::index()</a> but is less general because the latter expression may also be used to retrieve top level children, i.e. when <code>index</code> is invalid.<p>
<dl class="see" compact><dt><b>See also:</b></dt><dd><a class="el" href="classWt_1_1WAbstractItemModel.html#83f37bf04b8574b328c139b02523b8cb" title="Returns the child index for the given row and column.">WAbstractItemModel::index()</a>, <a class="el" href="classWt_1_1WModelIndex.html#1d4b05ee51c5c6961d6123565fd77c82" title="Returns whether the index is a real valid index.">isValid()</a> </dd></dl>
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<a class="anchor" name="0e6380caae0e785fdea9e30e0a95eec9"></a><!-- doxytag: member="Wt::WModelIndex::parent" ref="0e6380caae0e785fdea9e30e0a95eec9" args="() const " -->
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<td class="memname"><a class="el" href="classWt_1_1WModelIndex.html">WModelIndex</a> Wt::WModelIndex::parent </td>
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Returns an index to the parent.
<p>
This is a convenience method for <a class="el" href="classWt_1_1WAbstractItemModel.html#da454d45706ca0c1a0921dedd351c48c" title="Returns the parent for a model index.">WAbstractItemModel::parent()</a>.<p>
For a top level data item, the <a class="el" href="classWt_1_1WModelIndex.html#0e6380caae0e785fdea9e30e0a95eec9" title="Returns an index to the parent.">parent()</a> is an invalid index (see <a class="el" href="classWt_1_1WModelIndex.html#29431c83f8ed71654e213ec4aae21813" title="Create an invalid WModelIndex.">WModelIndex()</a>).<p>
<dl class="see" compact><dt><b>See also:</b></dt><dd><a class="el" href="classWt_1_1WAbstractItemModel.html#da454d45706ca0c1a0921dedd351c48c" title="Returns the parent for a model index.">WAbstractItemModel::parent()</a> </dd></dl>
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<a class="anchor" name="7f05920329ca4b7fdbb10931afdb634e"></a><!-- doxytag: member="Wt::WModelIndex::data" ref="7f05920329ca4b7fdbb10931afdb634e" args="(int role=DisplayRole) const " -->
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<td>(</td>
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<td class="paramname"> <em>role</em> = <code>DisplayRole</code> </td>
<td> ) </td>
<td> const</td>
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<p>
Returns data in the model at this index.
<p>
This is a convenience method for <a class="el" href="classWt_1_1WAbstractItemModel.html#9112b74d160f916ef75fb6c1c09dd8fe" title="Returns data at a specific model index.">WAbstractItemModel::data()</a>.<p>
<dl class="see" compact><dt><b>See also:</b></dt><dd><a class="el" href="classWt_1_1WAbstractItemModel.html#9112b74d160f916ef75fb6c1c09dd8fe" title="Returns data at a specific model index.">WAbstractItemModel::data()</a> <p>
<a class="el" href="group__modelview.html#g0ae864e12320f9f89172735e075ed068" title="Enumeration that indicates a role for a data item.">ItemDataRole</a> </dd></dl>
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<a class="anchor" name="04877832f757772b8dc7e6b30fb3638c"></a><!-- doxytag: member="Wt::WModelIndex::flags" ref="04877832f757772b8dc7e6b30fb3638c" args="() const " -->
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<td class="memname">WFlags< <a class="el" href="group__modelview.html#g1d77c4de293aebfacbdde124de06b8b0">ItemFlag</a> > Wt::WModelIndex::flags </td>
<td>(</td>
<td class="paramname"> </td>
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<td> const</td>
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<p>
Returns the flags for this item.
<p>
This is a convenience method for <a class="el" href="classWt_1_1WAbstractItemModel.html#b5e60f81be797c0553a010eff5b9a592" title="Returns the flags for an item.">WAbstractItemModel::flags()</a>.<p>
<dl class="see" compact><dt><b>See also:</b></dt><dd><a class="el" href="classWt_1_1WAbstractItemModel.html#b5e60f81be797c0553a010eff5b9a592" title="Returns the flags for an item.">WAbstractItemModel::flags()</a> <p>
<a class="el" href="group__modelview.html#g1d77c4de293aebfacbdde124de06b8b0" title="Flags that indicate data item options.">ItemFlag</a> </dd></dl>
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<a class="anchor" name="1d4b05ee51c5c6961d6123565fd77c82"></a><!-- doxytag: member="Wt::WModelIndex::isValid" ref="1d4b05ee51c5c6961d6123565fd77c82" args="() const " -->
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<td class="memname">bool Wt::WModelIndex::isValid </td>
<td>(</td>
<td class="paramname"> </td>
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<td> const<code> [inline]</code></td>
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<p>
Returns whether the index is a real valid index.
<p>
Returns <code>true</code> when the index points to a valid data item, i.e. at a valid <a class="el" href="classWt_1_1WModelIndex.html#a4f1385223391c46ee200a57672f6046" title="Returns the row for this model index.">row()</a> and <a class="el" href="classWt_1_1WModelIndex.html#0e6568dd7113662c3c378e2084729581" title="Returns the column for this model index.">column()</a>.<p>
An index may be invalid for two reasons:<ul>
<li>an operation requested an index that was out of model bounds,</li><li>or, the index corresponds to the model's top level root item, and is thus the parent index for top level items. </li></ul>
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<a class="anchor" name="9fe91b75030a8a7373e3262fbbc6cad6"></a><!-- doxytag: member="Wt::WModelIndex::model" ref="9fe91b75030a8a7373e3262fbbc6cad6" args="() const " -->
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<td class="memname">const <a class="el" href="classWt_1_1WAbstractItemModel.html">WAbstractItemModel</a>* Wt::WModelIndex::model </td>
<td>(</td>
<td class="paramname"> </td>
<td> ) </td>
<td> const<code> [inline]</code></td>
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<p>
Returns the model to which this (valid) index is bound.
<p>
This returns the model that created the model index.
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<a class="anchor" name="6bb6b3624c4d75e3a495860e46c04f9e"></a><!-- doxytag: member="Wt::WModelIndex::operator==" ref="6bb6b3624c4d75e3a495860e46c04f9e" args="(const WModelIndex &other) const " -->
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<td class="memname">bool Wt::WModelIndex::operator== </td>
<td>(</td>
<td class="paramtype">const <a class="el" href="classWt_1_1WModelIndex.html">WModelIndex</a> & </td>
<td class="paramname"> <em>other</em> </td>
<td> ) </td>
<td> const</td>
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<p>
Comparison operator.
<p>
Returns <code>true</code> only if the indexes point at the same data, in the same model.
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<a class="anchor" name="ce2743acada845b3d4912e70c9787eac"></a><!-- doxytag: member="Wt::WModelIndex::operator!=" ref="ce2743acada845b3d4912e70c9787eac" args="(const WModelIndex &other) const " -->
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<td class="memname">bool Wt::WModelIndex::operator!= </td>
<td>(</td>
<td class="paramtype">const <a class="el" href="classWt_1_1WModelIndex.html">WModelIndex</a> & </td>
<td class="paramname"> <em>other</em> </td>
<td> ) </td>
<td> const</td>
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<div class="memdoc">
<p>
Comparison operator.
<p>
<dl class="see" compact><dt><b>See also:</b></dt><dd><a class="el" href="classWt_1_1WModelIndex.html#6bb6b3624c4d75e3a495860e46c04f9e" title="Comparison operator.">operator==()</a> </dd></dl>
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<a class="anchor" name="29a0a0ab3e961b8087d95b7c62555cd1"></a><!-- doxytag: member="Wt::WModelIndex::operator<" ref="29a0a0ab3e961b8087d95b7c62555cd1" args="(const WModelIndex &other) const " -->
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<td class="memname">bool Wt::WModelIndex::operator< </td>
<td>(</td>
<td class="paramtype">const <a class="el" href="classWt_1_1WModelIndex.html">WModelIndex</a> & </td>
<td class="paramname"> <em>other</em> </td>
<td> ) </td>
<td> const</td>
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<p>
Comparison operator.
<p>
Returns <code>true</code> if the index comes topologically before <code>other</code>.<p>
Topological order follows the order in which the indexes would be displayed in a tree table view, from top to bottom followed by left to right.
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