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<h2><span class="refentrytitle"><a name="GwyNullStore.top_of_page"></a>GwyNullStore</span></h2>
<p>GwyNullStore — GtkTreeModel wrapper around nothing</p>
</td>
<td valign="top" align="right"></td>
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<div class="refsynopsisdiv">
<a name="GwyNullStore.synopsis"></a><h2>Synopsis</h2>
<pre class="synopsis">
#include <libgwydgets/gwydgets.h>
struct <a class="link" href="GwyNullStore.html#GwyNullStore-struct" title="struct GwyNullStore">GwyNullStore</a>;
struct <a class="link" href="GwyNullStore.html#GwyNullStoreClass" title="struct GwyNullStoreClass">GwyNullStoreClass</a>;
<a class="link" href="GwyNullStore.html" title="GwyNullStore"><span class="returnvalue">GwyNullStore</span></a> * <a class="link" href="GwyNullStore.html#gwy-null-store-new" title="gwy_null_store_new ()">gwy_null_store_new</a> (<em class="parameter"><code><a href="http://developer.gnome.org/doc/API/2.0/glib/glib-Basic-Types.html#guint"><span class="type">guint</span></a> n</code></em>);
<a href="http://developer.gnome.org/doc/API/2.0/glib/glib-Basic-Types.html#guint"><span class="returnvalue">guint</span></a> <a class="link" href="GwyNullStore.html#gwy-null-store-get-n-rows" title="gwy_null_store_get_n_rows ()">gwy_null_store_get_n_rows</a> (<em class="parameter"><code><a class="link" href="GwyNullStore.html" title="GwyNullStore"><span class="type">GwyNullStore</span></a> *store</code></em>);
<span class="returnvalue">void</span> <a class="link" href="GwyNullStore.html#gwy-null-store-set-n-rows" title="gwy_null_store_set_n_rows ()">gwy_null_store_set_n_rows</a> (<em class="parameter"><code><a class="link" href="GwyNullStore.html" title="GwyNullStore"><span class="type">GwyNullStore</span></a> *store</code></em>,
<em class="parameter"><code><a href="http://developer.gnome.org/doc/API/2.0/glib/glib-Basic-Types.html#guint"><span class="type">guint</span></a> n</code></em>);
<a href="http://developer.gnome.org/doc/API/2.0/glib/glib-Basic-Types.html#gpointer"><span class="returnvalue">gpointer</span></a> <a class="link" href="GwyNullStore.html#gwy-null-store-get-model" title="gwy_null_store_get_model ()">gwy_null_store_get_model</a> (<em class="parameter"><code><a class="link" href="GwyNullStore.html" title="GwyNullStore"><span class="type">GwyNullStore</span></a> *store</code></em>);
<span class="returnvalue">void</span> <a class="link" href="GwyNullStore.html#gwy-null-store-set-model" title="gwy_null_store_set_model ()">gwy_null_store_set_model</a> (<em class="parameter"><code><a class="link" href="GwyNullStore.html" title="GwyNullStore"><span class="type">GwyNullStore</span></a> *store</code></em>,
<em class="parameter"><code><a href="http://developer.gnome.org/doc/API/2.0/glib/glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> model</code></em>,
<em class="parameter"><code><a href="http://developer.gnome.org/doc/API/2.0/glib/glib-Datasets.html#GDestroyNotify"><span class="type">GDestroyNotify</span></a> destroy</code></em>);
<span class="returnvalue">void</span> <a class="link" href="GwyNullStore.html#gwy-null-store-row-changed" title="gwy_null_store_row_changed ()">gwy_null_store_row_changed</a> (<em class="parameter"><code><a class="link" href="GwyNullStore.html" title="GwyNullStore"><span class="type">GwyNullStore</span></a> *store</code></em>,
<em class="parameter"><code><a href="http://developer.gnome.org/doc/API/2.0/glib/glib-Basic-Types.html#guint"><span class="type">guint</span></a> i</code></em>);
<a href="http://developer.gnome.org/doc/API/2.0/glib/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a> <a class="link" href="GwyNullStore.html#gwy-null-store-iter-is-valid" title="gwy_null_store_iter_is_valid ()">gwy_null_store_iter_is_valid</a> (<em class="parameter"><code><a class="link" href="GwyNullStore.html" title="GwyNullStore"><span class="type">GwyNullStore</span></a> *store</code></em>,
<em class="parameter"><code><a href="http://developer.gnome.org/doc/API/2.0/gtk/GtkTreeModel.html#GtkTreeIter"><span class="type">GtkTreeIter</span></a> *iter</code></em>);
</pre>
</div>
<div class="refsect1">
<a name="GwyNullStore.object-hierarchy"></a><h2>Object Hierarchy</h2>
<pre class="synopsis">
<a href="http://developer.gnome.org/doc/API/2.0/gobject/gobject-The-Base-Object-Type.html#GObject">GObject</a>
+----GwyNullStore
</pre>
</div>
<div class="refsect1">
<a name="GwyNullStore.implemented-interfaces"></a><h2>Implemented Interfaces</h2>
<p>
GwyNullStore implements
<a href="http://developer.gnome.org/doc/API/2.0/gtk/GtkTreeModel.html">GtkTreeModel</a>.</p>
</div>
<div class="refsect1">
<a name="GwyNullStore.description"></a><h2>Description</h2>
<p>
<a class="link" href="GwyNullStore.html" title="GwyNullStore"><span class="type">GwyNullStore</span></a> is a very simple class which pretends to be a <a href="http://developer.gnome.org/doc/API/2.0/gtk/GtkTreeModel.html"><span class="type">GtkTreeModel</span></a>
with one column of type <a href="http://developer.gnome.org/doc/API/2.0/gobject/gobject-Type-Information.html#G-TYPE-UINT:CAPS"><code class="literal">G_TYPE_UINT</code></a> whose values are equal to row numbers
(counted from 0). In reality the column is purely virtual and the store
always takes up only a small constant amount of memory.
</p>
<p>
The purpose of <a class="link" href="GwyNullStore.html" title="GwyNullStore"><span class="type">GwyNullStore</span></a> is to provide a low-overhead <a href="http://developer.gnome.org/doc/API/2.0/gtk/GtkTreeModel.html"><span class="type">GtkTreeModel</span></a>
interface for array-like (and other indexed) data structures.
</p>
<p>
A new null store can be created with <a class="link" href="GwyNullStore.html#gwy-null-store-new" title="gwy_null_store_new ()"><code class="function">gwy_null_store_new()</code></a>, then number of
virtual rows can be controlled with <a class="link" href="GwyNullStore.html#gwy-null-store-set-n-rows" title="gwy_null_store_set_n_rows ()"><code class="function">gwy_null_store_set_n_rows()</code></a>. For
convenience, a method to emit "row-changed" signal on a row by its index is
provided: <a class="link" href="GwyNullStore.html#gwy-null-store-row-changed" title="gwy_null_store_row_changed ()"><code class="function">gwy_null_store_row_changed()</code></a>.
</p>
<p>
Since null stores often serve as wrappers around other data structures,
convenience methods to attach and obtain such a data are provided:
<a class="link" href="GwyNullStore.html#gwy-null-store-set-model" title="gwy_null_store_set_model ()"><code class="function">gwy_null_store_set_model()</code></a>, <a class="link" href="GwyNullStore.html#gwy-null-store-get-model" title="gwy_null_store_get_model ()"><code class="function">gwy_null_store_get_model()</code></a>.
</p>
<p>
A simple example to create a multiplication table with null storage:
</p>
<div class="informalexample">
<table class="listing_frame" border="0" cellpadding="0" cellspacing="0">
<tbody>
<tr>
<td class="listing_lines" align="right"><pre>1
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20</pre></td>
<td class="listing_code"><pre class="programlisting"><span class="usertype">GtkWidget</span><span class="normal"> </span><span class="symbol">*</span><span class="normal">treeview</span><span class="symbol">;</span>
<span class="usertype">GtkTreeViewColumn</span><span class="normal"> </span><span class="symbol">*</span><span class="normal">column</span><span class="symbol">;</span>
<span class="usertype">GtkCellRenderer</span><span class="normal"> </span><span class="symbol">*</span><span class="normal">renderer</span><span class="symbol">;</span>
<span class="usertype">GwyNullStore</span><span class="normal"> </span><span class="symbol">*</span><span class="normal">store</span><span class="symbol">;</span>
<span class="usertype">gint</span><span class="normal"> i</span><span class="symbol">;</span>
<span class="normal">store </span><span class="symbol">=</span><span class="normal"> </span><span class="function"><a href="#gwy-null-store-new">gwy_null_store_new</a></span><span class="symbol">(</span><span class="number">10</span><span class="symbol">);</span>
<span class="normal">treeview </span><span class="symbol">=</span><span class="normal"> </span><span class="function"><a href="http://developer.gnome.org/doc/API/2.0/gtk/GtkTreeView.html#gtk-tree-view-new-with-model">gtk_tree_view_new_with_model</a></span><span class="symbol">(</span><span class="function">GTK_TREE_MODEL</span><span class="symbol">(</span><span class="normal">store</span><span class="symbol">));</span>
<span class="function"><a href="http://developer.gnome.org/doc/API/2.0/gtk/GtkTreeView.html#gtk-tree-view-set-headers-visible">gtk_tree_view_set_headers_visible</a></span><span class="symbol">(</span><span class="function">GTK_TREE_VIEW</span><span class="symbol">(</span><span class="normal">treeview</span><span class="symbol">),</span><span class="normal"> <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#FALSE:CAPS">FALSE</a></span><span class="symbol">);</span>
<span class="normal">column </span><span class="symbol">=</span><span class="normal"> </span><span class="function"><a href="/usr/share/gtk-doc/html/gtk3/GtkTreeViewColumn.html#gtk-tree-view-column-new">gtk_tree_view_column_new</a></span><span class="symbol">();</span>
<span class="keyword">for</span><span class="normal"> </span><span class="symbol">(</span><span class="normal">i </span><span class="symbol">=</span><span class="normal"> </span><span class="number">1</span><span class="symbol">;</span><span class="normal"> i </span><span class="symbol"><=</span><span class="normal"> </span><span class="number">10</span><span class="symbol">;</span><span class="normal"> i</span><span class="symbol">++)</span><span class="normal"> </span><span class="cbracket">{</span>
<span class="normal"> renderer </span><span class="symbol">=</span><span class="normal"> </span><span class="function"><a href="/usr/share/gtk-doc/html/gtk3/GtkCellRendererText.html#gtk-cell-renderer-text-new">gtk_cell_renderer_text_new</a></span><span class="symbol">();</span>
<span class="normal"> </span><span class="function"><a href="/usr/share/gtk-doc/html/gobject/gobject-The-Base-Object-Type.html#g-object-set">g_object_set</a></span><span class="symbol">(</span><span class="normal">renderer</span><span class="symbol">,</span><span class="normal"> </span><span class="string">"xalign"</span><span class="symbol">,</span><span class="normal"> </span><span class="number">1.0</span><span class="symbol">,</span><span class="normal"> </span><span class="string">"width-chars"</span><span class="symbol">,</span><span class="normal"> </span><span class="number">4</span><span class="symbol">,</span><span class="normal"> <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#NULL:CAPS">NULL</a></span><span class="symbol">);</span>
<span class="normal"> </span><span class="function"><a href="/usr/share/gtk-doc/html/gtk3/GtkTreeViewColumn.html#gtk-tree-view-column-pack-start">gtk_tree_view_column_pack_start</a></span><span class="symbol">(</span><span class="normal">column</span><span class="symbol">,</span><span class="normal"> renderer</span><span class="symbol">,</span><span class="normal"> <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#TRUE:CAPS">TRUE</a></span><span class="symbol">);</span>
<span class="normal"> </span><span class="function"><a href="/usr/share/gtk-doc/html/gtk3/GtkTreeViewColumn.html#gtk-tree-view-column-set-cell-data-func">gtk_tree_view_column_set_cell_data_func</a></span><span class="symbol">(</span><span class="normal">column</span><span class="symbol">,</span><span class="normal"> renderer</span><span class="symbol">,</span>
<span class="normal"> multiply</span><span class="symbol">,</span><span class="normal"> </span><span class="function"><a href="/usr/share/gtk-doc/html/glib/glib-Type-Conversion-Macros.html#GINT-TO-POINTER:CAPS">GINT_TO_POINTER</a></span><span class="symbol">(</span><span class="normal">i</span><span class="symbol">),</span>
<span class="normal"> <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#NULL:CAPS">NULL</a></span><span class="symbol">);</span>
<span class="cbracket">}</span>
<span class="function"><a href="/usr/share/gtk-doc/html/gtk3/GtkTreeView.html#gtk-tree-view-append-column">gtk_tree_view_append_column</a></span><span class="symbol">(</span><span class="function">GTK_TREE_VIEW</span><span class="symbol">(</span><span class="normal">treeview</span><span class="symbol">),</span><span class="normal"> column</span><span class="symbol">);</span></pre></td>
</tr>
</tbody>
</table>
</div>
<p>
</p>
<p>
The cell data function multiply() just multiplies the column number
with the number of (virtual) null store row:
</p>
<div class="informalexample">
<table class="listing_frame" border="0" cellpadding="0" cellspacing="0">
<tbody>
<tr>
<td class="listing_lines" align="right"><pre>1
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<td class="listing_code"><pre class="programlisting"><span class="keyword">static</span><span class="normal"> </span><span class="type">void</span>
<span class="function">multiply</span><span class="symbol">(</span><span class="usertype">GtkTreeViewColumn</span><span class="normal"> </span><span class="symbol">*</span><span class="normal">column</span><span class="symbol">,</span>
<span class="normal"> </span><span class="usertype">GtkCellRenderer</span><span class="normal"> </span><span class="symbol">*</span><span class="normal">renderer</span><span class="symbol">,</span>
<span class="normal"> </span><span class="usertype">GtkTreeModel</span><span class="normal"> </span><span class="symbol">*</span><span class="normal">model</span><span class="symbol">,</span>
<span class="normal"> </span><span class="usertype">GtkTreeIter</span><span class="normal"> </span><span class="symbol">*</span><span class="normal">iter</span><span class="symbol">,</span>
<span class="normal"> </span><span class="usertype">gpointer</span><span class="normal"> data</span><span class="symbol">)</span>
<span class="cbracket">{</span>
<span class="normal"> </span><span class="usertype">gchar</span><span class="normal"> buf</span><span class="symbol">[</span><span class="number">20</span><span class="symbol">];</span>
<span class="normal"> </span><span class="usertype">gint</span><span class="normal"> i</span><span class="symbol">;</span>
<span class="normal"> </span><span class="function"><a href="/usr/share/gtk-doc/html/gtk3/GtkTreeModel.html#gtk-tree-model-get">gtk_tree_model_get</a></span><span class="symbol">(</span><span class="normal">model</span><span class="symbol">,</span><span class="normal"> iter</span><span class="symbol">,</span><span class="normal"> </span><span class="number">0</span><span class="symbol">,</span><span class="normal"> </span><span class="symbol">&</span><span class="normal">i</span><span class="symbol">,</span><span class="normal"> </span><span class="symbol">-</span><span class="number">1</span><span class="symbol">);</span>
<span class="normal"> </span><span class="function"><a href="/usr/share/gtk-doc/html/glib/glib-String-Utility-Functions.html#g-snprintf">g_snprintf</a></span><span class="symbol">(</span><span class="normal">buf</span><span class="symbol">,</span><span class="normal"> </span><span class="keyword">sizeof</span><span class="symbol">(</span><span class="normal">buf</span><span class="symbol">),</span><span class="normal"> </span><span class="string">"%d"</span><span class="symbol">,</span><span class="normal"> </span><span class="symbol">(</span><span class="normal">i </span><span class="symbol">+</span><span class="normal"> </span><span class="number">1</span><span class="symbol">)*</span><span class="function"><a href="/usr/share/gtk-doc/html/glib/glib-Type-Conversion-Macros.html#GPOINTER-TO-INT:CAPS">GPOINTER_TO_INT</a></span><span class="symbol">(</span><span class="normal">data</span><span class="symbol">));</span>
<span class="normal"> </span><span class="function"><a href="/usr/share/gtk-doc/html/gobject/gobject-The-Base-Object-Type.html#g-object-set">g_object_set</a></span><span class="symbol">(</span><span class="normal">renderer</span><span class="symbol">,</span><span class="normal"> </span><span class="string">"text"</span><span class="symbol">,</span><span class="normal"> buf</span><span class="symbol">,</span><span class="normal"> <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#NULL:CAPS">NULL</a></span><span class="symbol">);</span>
<span class="cbracket">}</span></pre></td>
</tr>
</tbody>
</table>
</div>
<p>
</p>
<p>
To extend the multiplication table to 20 rows, one only needs
</p>
<div class="informalexample">
<table class="listing_frame" border="0" cellpadding="0" cellspacing="0">
<tbody>
<tr>
<td class="listing_lines" align="right"><pre>1</pre></td>
<td class="listing_code"><pre class="programlisting"><span class="function"><a href="#gwy-null-store-set-n-rows">gwy_null_store_set_n_rows</a></span><span class="symbol">(</span><span class="normal">store</span><span class="symbol">,</span><span class="normal"> </span><span class="number">20</span><span class="symbol">);</span></pre></td>
</tr>
</tbody>
</table>
</div>
<p>
</p>
</div>
<div class="refsect1">
<a name="GwyNullStore.details"></a><h2>Details</h2>
<div class="refsect2">
<a name="GwyNullStore-struct"></a><h3>struct GwyNullStore</h3>
<pre class="programlisting">struct GwyNullStore;</pre>
<p>
</p>
</div>
<hr>
<div class="refsect2">
<a name="GwyNullStoreClass"></a><h3>struct GwyNullStoreClass</h3>
<pre class="programlisting">struct GwyNullStoreClass {
GObjectClass parent_class;
void (*reserved1)(void);
};
</pre>
<p>
</p>
</div>
<hr>
<div class="refsect2">
<a name="gwy-null-store-new"></a><h3>gwy_null_store_new ()</h3>
<pre class="programlisting"><a class="link" href="GwyNullStore.html" title="GwyNullStore"><span class="returnvalue">GwyNullStore</span></a> * gwy_null_store_new (<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guint"><span class="type">guint</span></a> n</code></em>);</pre>
<p>
Creates a new <a href="/usr/share/gtk-doc/html/gtk3/GtkTreeModel.html"><span class="type">GtkTreeModel</span></a> wrapper around nothing.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>n</code></em> :</span></p></td>
<td>The initial number of rows.</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>The newly created null store.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gwy-null-store-get-n-rows"></a><h3>gwy_null_store_get_n_rows ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guint"><span class="returnvalue">guint</span></a> gwy_null_store_get_n_rows (<em class="parameter"><code><a class="link" href="GwyNullStore.html" title="GwyNullStore"><span class="type">GwyNullStore</span></a> *store</code></em>);</pre>
<p>
Gets the number of imaginary rows in a null store.
</p>
<p>
This is a convenience function, the same information can be obtained with
<a href="/usr/share/gtk-doc/html/gtk3/GtkTreeModel.html#gtk-tree-model-iter-n-children"><code class="function">gtk_tree_model_iter_n_children()</code></a>.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>store</code></em> :</span></p></td>
<td>A null store.</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>The number of rows.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gwy-null-store-set-n-rows"></a><h3>gwy_null_store_set_n_rows ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> gwy_null_store_set_n_rows (<em class="parameter"><code><a class="link" href="GwyNullStore.html" title="GwyNullStore"><span class="type">GwyNullStore</span></a> *store</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guint"><span class="type">guint</span></a> n</code></em>);</pre>
<p>
Sets the number of imaginary rows in a null store.
</p>
<p>
If the new number of rows is larger than the current one, rows will be
sequentially and virtually appended to the end of the store until the
requested number of rows is reached.
</p>
<p>
Similarly, if the new number of rows is smaller then the current one, rows
will be sequentially and virtually deleted from the end of the store until
the requested number of rows is reached.
</p>
<p>
Note for radical changes it is usually more useful to disconnect the model
from its view(s), change the number of rows, and then reconnect.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>store</code></em> :</span></p></td>
<td>A null store.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>n</code></em> :</span></p></td>
<td>The new number of rows.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gwy-null-store-get-model"></a><h3>gwy_null_store_get_model ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gpointer"><span class="returnvalue">gpointer</span></a> gwy_null_store_get_model (<em class="parameter"><code><a class="link" href="GwyNullStore.html" title="GwyNullStore"><span class="type">GwyNullStore</span></a> *store</code></em>);</pre>
<p>
Gets the model pointer of a null store.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>store</code></em> :</span></p></td>
<td>A null store.</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>The pointer set with <a class="link" href="GwyNullStore.html#gwy-null-store-set-model" title="gwy_null_store_set_model ()"><code class="function">gwy_null_store_set_model()</code></a>.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gwy-null-store-set-model"></a><h3>gwy_null_store_set_model ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> gwy_null_store_set_model (<em class="parameter"><code><a class="link" href="GwyNullStore.html" title="GwyNullStore"><span class="type">GwyNullStore</span></a> *store</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> model</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Datasets.html#GDestroyNotify"><span class="type">GDestroyNotify</span></a> destroy</code></em>);</pre>
<p>
Sets the model pointer of a null store.
</p>
<p>
While the virtual integers in <a class="link" href="GwyNullStore.html" title="GwyNullStore"><span class="type">GwyNullStore</span></a> can be used directly, a null
store typically serves as an adaptor for array-like structures and its rows
are used as indices to these structures. This helper method provides means
to attach such a structure to a null store in the common case.
</p>
<p>
The store itself does not interpret nor access the attached data by any
means. No signals are emitted in response to the model pointer change
either, particularly because it is expected to be set only once upon
creation (null stores are cheap).
</p>
<p>
You are free to keep the model pointer at <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a> if these functions do not
suit your needs.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>store</code></em> :</span></p></td>
<td>A null store.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>model</code></em> :</span></p></td>
<td>Model pointer.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>destroy</code></em> :</span></p></td>
<td>Function to call on <em class="parameter"><code>model</code></em> when it is replaced or the store is
destroyed.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gwy-null-store-row-changed"></a><h3>gwy_null_store_row_changed ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> gwy_null_store_row_changed (<em class="parameter"><code><a class="link" href="GwyNullStore.html" title="GwyNullStore"><span class="type">GwyNullStore</span></a> *store</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guint"><span class="type">guint</span></a> i</code></em>);</pre>
<p>
Emits "GtkTreeModel::row-changed" signal on a null store.
</p>
<p>
This is a convenience method, with a bit more work the same effect can be
achieved with <a href="/usr/share/gtk-doc/html/gtk3/GtkTreeModel.html#gtk-tree-model-row-changed"><code class="function">gtk_tree_model_row_changed()</code></a>.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>store</code></em> :</span></p></td>
<td>A null store.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>i</code></em> :</span></p></td>
<td>A row to emit "row-changed" on.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gwy-null-store-iter-is-valid"></a><h3>gwy_null_store_iter_is_valid ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a> gwy_null_store_iter_is_valid (<em class="parameter"><code><a class="link" href="GwyNullStore.html" title="GwyNullStore"><span class="type">GwyNullStore</span></a> *store</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/gtk3/GtkTreeModel.html#GtkTreeIter"><span class="type">GtkTreeIter</span></a> *iter</code></em>);</pre>
<p>
Checks if the given iter is a valid iter for this null store.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>store</code></em> :</span></p></td>
<td>A null store.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>iter</code></em> :</span></p></td>
<td>A <a href="/usr/share/gtk-doc/html/gtk3/GtkTreeModel.html#GtkTreeIter"><span class="type">GtkTreeIter</span></a>.</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>
<a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#TRUE:CAPS"><code class="literal">TRUE</code></a> if the iter is valid, <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#FALSE:CAPS"><code class="literal">FALSE</code></a> if the iter is invalid.</td>
</tr>
</tbody>
</table></div>
</div>
</div>
<div class="refsect1">
<a name="GwyNullStore.see-also"></a><h2>See Also</h2>
<a class="link" href="GwyInventoryStore.html" title="GwyInventoryStore"><span class="type">GwyInventoryStore</span></a> -- <a href="/usr/share/gtk-doc/html/gtk3/GtkTreeModel.html"><span class="type">GtkTreeModel</span></a> wrapper around <a href="../libgwyddion/GwyInventory.html"><span class="type">GwyInventory</span></a>
</div>
</div>
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