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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<title>GwyVectorLayer: Gwyddion Widgets Library Reference Manual</title>
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<a href="#" class="shortcut">Top</a><span id="nav_description"> <span class="dim">|</span>
<a href="#GwyVectorLayer.description" class="shortcut">Description</a></span><span id="nav_hierarchy"> <span class="dim">|</span>
<a href="#GwyVectorLayer.object-hierarchy" class="shortcut">Object Hierarchy</a></span><span id="nav_properties"> <span class="dim">|</span>
<a href="#GwyVectorLayer.properties" class="shortcut">Properties</a></span><span id="nav_signals"> <span class="dim">|</span>
<a href="#GwyVectorLayer.signals" class="shortcut">Signals</a></span>
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<div class="refentry">
<a name="GwyVectorLayer"></a><div class="titlepage"></div>
<div class="refnamediv"><table width="100%"><tr>
<td valign="top">
<h2><span class="refentrytitle"><a name="GwyVectorLayer.top_of_page"></a>GwyVectorLayer</span></h2>
<p>GwyVectorLayer — Base class for GwyDataView vector (interactive) layers</p>
</td>
<td class="gallery_image" valign="top" align="right"></td>
</tr></table></div>
<div class="refsect1">
<a name="GwyVectorLayer.functions"></a><h2>Functions</h2>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="functions_proto_type">
<col class="functions_proto_name">
</colgroup>
<tbody>
<tr>
<td class="function_type">
<a href="http://developer.gnome.org/doc/API/2.0/gobject/gobject-Type-Information.html#GType"><span class="returnvalue">GType</span></a>
</td>
<td class="function_name">
<a class="link" href="GwyVectorLayer.html#gwy-vector-layer-class-get-selection-type" title="gwy_vector_layer_class_get_selection_type ()">gwy_vector_layer_class_get_selection_type</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="define_keyword">#define</td>
<td class="function_name">
<a class="link" href="GwyVectorLayer.html#gwy-vector-layer-get-selection-type" title="gwy_vector_layer_get_selection_type()">gwy_vector_layer_get_selection_type</a><span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="GwyVectorLayer.html#gwy-vector-layer-set-selection-key" title="gwy_vector_layer_set_selection_key ()">gwy_vector_layer_set_selection_key</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">const <a href="http://developer.gnome.org/doc/API/2.0/glib/glib-Basic-Types.html#gchar"><span class="returnvalue">gchar</span></a> *
</td>
<td class="function_name">
<a class="link" href="GwyVectorLayer.html#gwy-vector-layer-get-selection-key" title="gwy_vector_layer_get_selection_key ()">gwy_vector_layer_get_selection_key</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a href="../GwySelection.html#GwySelection-struct"><span class="returnvalue">GwySelection</span></a> *
</td>
<td class="function_name">
<a class="link" href="GwyVectorLayer.html#gwy-vector-layer-ensure-selection" title="gwy_vector_layer_ensure_selection ()">gwy_vector_layer_ensure_selection</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a href="http://developer.gnome.org/doc/API/2.0/glib/glib-Basic-Types.html#gint"><span class="returnvalue">gint</span></a>
</td>
<td class="function_name">
<a class="link" href="GwyVectorLayer.html#gwy-vector-layer-get-focus" title="gwy_vector_layer_get_focus ()">gwy_vector_layer_get_focus</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a href="http://developer.gnome.org/doc/API/2.0/glib/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
</td>
<td class="function_name">
<a class="link" href="GwyVectorLayer.html#gwy-vector-layer-set-focus" title="gwy_vector_layer_set_focus ()">gwy_vector_layer_set_focus</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a href="http://developer.gnome.org/doc/API/2.0/glib/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
</td>
<td class="function_name">
<a class="link" href="GwyVectorLayer.html#gwy-vector-layer-get-editable" title="gwy_vector_layer_get_editable ()">gwy_vector_layer_get_editable</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="GwyVectorLayer.html#gwy-vector-layer-set-editable" title="gwy_vector_layer_set_editable ()">gwy_vector_layer_set_editable</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="GwyVectorLayer.html#gwy-vector-layer-draw" title="gwy_vector_layer_draw ()">gwy_vector_layer_draw</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a href="http://developer.gnome.org/doc/API/2.0/glib/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
</td>
<td class="function_name">
<a class="link" href="GwyVectorLayer.html#gwy-vector-layer-button-press" title="gwy_vector_layer_button_press ()">gwy_vector_layer_button_press</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a href="http://developer.gnome.org/doc/API/2.0/glib/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
</td>
<td class="function_name">
<a class="link" href="GwyVectorLayer.html#gwy-vector-layer-button-release" title="gwy_vector_layer_button_release ()">gwy_vector_layer_button_release</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a href="http://developer.gnome.org/doc/API/2.0/glib/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
</td>
<td class="function_name">
<a class="link" href="GwyVectorLayer.html#gwy-vector-layer-motion-notify" title="gwy_vector_layer_motion_notify ()">gwy_vector_layer_motion_notify</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a href="http://developer.gnome.org/doc/API/2.0/glib/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
</td>
<td class="function_name">
<a class="link" href="GwyVectorLayer.html#gwy-vector-layer-key-press" title="gwy_vector_layer_key_press ()">gwy_vector_layer_key_press</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a href="http://developer.gnome.org/doc/API/2.0/glib/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
</td>
<td class="function_name">
<a class="link" href="GwyVectorLayer.html#gwy-vector-layer-key-release" title="gwy_vector_layer_key_release ()">gwy_vector_layer_key_release</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="GwyVectorLayer.html#gwy-vector-layer-object-chosen" title="gwy_vector_layer_object_chosen ()">gwy_vector_layer_object_chosen</a> <span class="c_punctuation">()</span>
</td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect1">
<a name="GwyVectorLayer.properties"></a><h2>Properties</h2>
<div class="informaltable"><table class="informaltable" border="0">
<colgroup>
<col width="150px" class="properties_type">
<col width="300px" class="properties_name">
<col width="200px" class="properties_flags">
</colgroup>
<tbody>
<tr>
<td class="property_type"><a href="http://developer.gnome.org/doc/API/2.0/glib/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a></td>
<td class="property_name"><a class="link" href="GwyVectorLayer.html#GwyVectorLayer--editable" title="The “editable” property">editable</a></td>
<td class="property_flags">Read / Write</td>
</tr>
<tr>
<td class="property_type"><span class="type">int</span></td>
<td class="property_name"><a class="link" href="GwyVectorLayer.html#GwyVectorLayer--focus" title="The “focus” property">focus</a></td>
<td class="property_flags">Read / Write</td>
</tr>
<tr>
<td class="property_type">
<span class="type">char</span> *</td>
<td class="property_name"><a class="link" href="GwyVectorLayer.html#GwyVectorLayer--selection-key" title="The “selection-key” property">selection-key</a></td>
<td class="property_flags">Read / Write</td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect1">
<a name="GwyVectorLayer.signals"></a><h2>Signals</h2>
<div class="informaltable"><table class="informaltable" border="0">
<colgroup>
<col width="150px" class="signal_proto_type">
<col width="300px" class="signal_proto_name">
<col width="200px" class="signal_proto_flags">
</colgroup>
<tbody><tr>
<td class="signal_type"><span class="returnvalue">void</span></td>
<td class="signal_name"><a class="link" href="GwyVectorLayer.html#GwyVectorLayer-object-chosen" title="The “object-chosen” signal">object-chosen</a></td>
<td class="signal_flags"><a href="http://developer.gnome.org/doc/API/2.0/gobject/gobject-Signals.html#G-SIGNAL-RUN-FIRST:CAPS">Run First</a></td>
</tr></tbody>
</table></div>
</div>
<div class="refsect1">
<a name="GwyVectorLayer.other"></a><h2>Types and Values</h2>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="other_proto_type">
<col class="other_proto_name">
</colgroup>
<tbody>
<tr>
<td class="datatype_keyword">struct</td>
<td class="function_name"><a class="link" href="GwyVectorLayer.html#GwyVectorLayer-struct" title="struct GwyVectorLayer">GwyVectorLayer</a></td>
</tr>
<tr>
<td class="datatype_keyword">struct</td>
<td class="function_name"><a class="link" href="GwyVectorLayer.html#GwyVectorLayerClass" title="struct GwyVectorLayerClass">GwyVectorLayerClass</a></td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect1">
<a name="GwyVectorLayer.object-hierarchy"></a><h2>Object Hierarchy</h2>
<pre class="screen"> <a href="http://developer.gnome.org/doc/API/2.0/gobject/gobject-The-Base-Object-Type.html#GObject-struct">GObject</a>
<span class="lineart">╰──</span> <a href="http://developer.gnome.org/doc/API/2.0/gobject/gobject-The-Base-Object-Type.html#GInitiallyUnowned">GInitiallyUnowned</a>
<span class="lineart">╰──</span> <a href="http://developer.gnome.org/doc/API/2.0/gtk/GtkObject.html#GtkObject-struct">GtkObject</a>
<span class="lineart">╰──</span> <a class="link" href="GwyDataViewLayer.html" title="GwyDataViewLayer">GwyDataViewLayer</a>
<span class="lineart">╰──</span> GwyVectorLayer
</pre>
</div>
<div class="refsect1">
<a name="GwyVectorLayer.includes"></a><h2>Includes</h2>
<pre class="synopsis">#include <libgwydgets/gwydgets.h>
</pre>
</div>
<div class="refsect1">
<a name="GwyVectorLayer.description"></a><h2>Description</h2>
<p><a class="link" href="GwyVectorLayer.html" title="GwyVectorLayer"><span class="type">GwyVectorLayer</span></a> is a base class for <a class="link" href="GwyDataViewLayer.html" title="GwyDataViewLayer"><span class="type">GwyDataViewLayer</span></a>s displaying
selections and handling user input. It is a <a class="link" href="GwyDataView.html" title="GwyDataView"><span class="type">GwyDataView</span></a> component and it
is not normally usable outside of it.</p>
<p>The layer takes the selection to display from its parent <a class="link" href="GwyDataView.html" title="GwyDataView"><span class="type">GwyDataView</span></a>'s
container. The key under which the selection is found is set with
<a class="link" href="GwyVectorLayer.html#gwy-vector-layer-set-selection-key" title="gwy_vector_layer_set_selection_key ()"><code class="function">gwy_vector_layer_set_selection_key()</code></a>. The selection either can be put
there beforehand (the corresponding selection type can be obtained with
<a class="link" href="GwyVectorLayer.html#gwy-vector-layer-class-get-selection-type" title="gwy_vector_layer_class_get_selection_type ()"><code class="function">gwy_vector_layer_class_get_selection_type()</code></a>) or
<a class="link" href="GwyVectorLayer.html#gwy-vector-layer-ensure-selection" title="gwy_vector_layer_ensure_selection ()"><code class="function">gwy_vector_layer_ensure_selection()</code></a> can be used to create it if it doesn't
exist.</p>
<p><a class="link" href="GwyVectorLayer.html" title="GwyVectorLayer"><span class="type">GwyVectorLayer</span></a> provides two independent means to restrict user interaction
with displayed selection: editability and focus. When a layer is set
noneditable (see <a class="link" href="GwyVectorLayer.html#gwy-vector-layer-set-editable" title="gwy_vector_layer_set_editable ()"><code class="function">gwy_vector_layer_set_editable()</code></a>), the user cannot modify
displayed objects, however "object-chosen" is emitted normally. Focus
(see <a class="link" href="GwyVectorLayer.html#gwy-vector-layer-set-focus" title="gwy_vector_layer_set_focus ()"><code class="function">gwy_vector_layer_set_focus()</code></a>) on the other hand limits all possible
interactions to a single selection object. It is possible although not
very useful to combine both restrictions.</p>
<p>The other methods are rarely useful outside <a class="link" href="GwyDataView.html" title="GwyDataView"><span class="type">GwyDataView</span></a> and/or layer
implementation.</p>
</div>
<div class="refsect1">
<a name="GwyVectorLayer.functions_details"></a><h2>Functions</h2>
<div class="refsect2">
<a name="gwy-vector-layer-class-get-selection-type"></a><h3>gwy_vector_layer_class_get_selection_type ()</h3>
<pre class="programlisting"><a href="http://developer.gnome.org/doc/API/2.0/gobject/gobject-Type-Information.html#GType"><span class="returnvalue">GType</span></a>
gwy_vector_layer_class_get_selection_type
(<em class="parameter"><code><a class="link" href="GwyVectorLayer.html#GwyVectorLayerClass" title="struct GwyVectorLayerClass"><span class="type">GwyVectorLayerClass</span></a> *klass</code></em>);</pre>
<p>Returns the selection type of a vector layer class.</p>
<p>Note this is a class method, to get the type from an instance one can use
<a class="link" href="GwyVectorLayer.html#gwy-vector-layer-get-selection-type" title="gwy_vector_layer_get_selection_type()"><code class="function">gwy_vector_layer_get_selection_type()</code></a>. To get the type from layer's
<a href="/usr/share/gtk-doc/html/gobject/gobject-Type-Information.html#GType"><span class="type">GType</span></a> one has to use <a href="/usr/share/gtk-doc/html/gobject/gobject-Type-Information.html#g-type-class-peek"><code class="function">g_type_class_peek()</code></a>.</p>
<div class="refsect3">
<a name="gwy-vector-layer-class-get-selection-type.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>klass</p></td>
<td class="parameter_description"><p>A vector layer class.</p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="gwy-vector-layer-class-get-selection-type.returns"></a><h4>Returns</h4>
<p> The type of selection used by layers of class <em class="parameter"><code>klass</code></em>
.</p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gwy-vector-layer-get-selection-type"></a><h3>gwy_vector_layer_get_selection_type()</h3>
<pre class="programlisting">#define gwy_vector_layer_get_selection_type(layer)</pre>
<p>Gets the selection type of a vector layer.</p>
<p>This is a convenience wrapper around
<a class="link" href="GwyVectorLayer.html#gwy-vector-layer-class-get-selection-type" title="gwy_vector_layer_class_get_selection_type ()"><code class="function">gwy_vector_layer_class_get_selection_type()</code></a>.</p>
<div class="refsect3">
<a name="gwy-vector-layer-get-selection-type.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>layer</p></td>
<td class="parameter_description"><p>A vector layer.</p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gwy-vector-layer-set-selection-key"></a><h3>gwy_vector_layer_set_selection_key ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
gwy_vector_layer_set_selection_key (<em class="parameter"><code><a class="link" href="GwyVectorLayer.html" title="GwyVectorLayer"><span class="type">GwyVectorLayer</span></a> *layer</code></em>,
<em class="parameter"><code>const <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *key</code></em>);</pre>
<p>Sets the selection object to use by a vector layer.</p>
<div class="refsect3">
<a name="gwy-vector-layer-set-selection-key.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>layer</p></td>
<td class="parameter_description"><p>A vector layer.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>key</p></td>
<td class="parameter_description"><p>Container string key identifying the selection object.</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gwy-vector-layer-get-selection-key"></a><h3>gwy_vector_layer_get_selection_key ()</h3>
<pre class="programlisting">const <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gchar"><span class="returnvalue">gchar</span></a> *
gwy_vector_layer_get_selection_key (<em class="parameter"><code><a class="link" href="GwyVectorLayer.html" title="GwyVectorLayer"><span class="type">GwyVectorLayer</span></a> *layer</code></em>);</pre>
<p>Gets the key identifying selection this vector layer displays.</p>
<div class="refsect3">
<a name="gwy-vector-layer-get-selection-key.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>layer</p></td>
<td class="parameter_description"><p>A vector layer.</p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="gwy-vector-layer-get-selection-key.returns"></a><h4>Returns</h4>
<p> The string key, or <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a> if it isn't set.</p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gwy-vector-layer-ensure-selection"></a><h3>gwy_vector_layer_ensure_selection ()</h3>
<pre class="programlisting"><a href="../GwySelection.html#GwySelection-struct"><span class="returnvalue">GwySelection</span></a> *
gwy_vector_layer_ensure_selection (<em class="parameter"><code><a class="link" href="GwyVectorLayer.html" title="GwyVectorLayer"><span class="type">GwyVectorLayer</span></a> *layer</code></em>);</pre>
<p>Ensures a vector layer's selection exist in data container.</p>
<p>This method can be called only when layer is plugged into a data view and it
has a selection key set. If the data container contains a selection under
the specified key the selection is returned. If there is none,
a selection of appropriate type is created and put to the container first.</p>
<p>Provided the above conditions are met this method is suitable for just
obtaining the selection object a vector layer uses too.</p>
<div class="refsect3">
<a name="gwy-vector-layer-ensure-selection.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>layer</p></td>
<td class="parameter_description"><p>A vector layer.</p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="gwy-vector-layer-ensure-selection.returns"></a><h4>Returns</h4>
<p> The layer's selection (no reference is added).</p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gwy-vector-layer-get-focus"></a><h3>gwy_vector_layer_get_focus ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint"><span class="returnvalue">gint</span></a>
gwy_vector_layer_get_focus (<em class="parameter"><code><a class="link" href="GwyVectorLayer.html" title="GwyVectorLayer"><span class="type">GwyVectorLayer</span></a> *layer</code></em>);</pre>
<p>Gets focused object index.</p>
<div class="refsect3">
<a name="gwy-vector-layer-get-focus.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>layer</p></td>
<td class="parameter_description"><p>A vector data view layer.</p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="gwy-vector-layer-get-focus.returns"></a><h4>Returns</h4>
<p> Focued object index, or -1 if no object is focused.</p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gwy-vector-layer-set-focus"></a><h3>gwy_vector_layer_set_focus ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
gwy_vector_layer_set_focus (<em class="parameter"><code><a class="link" href="GwyVectorLayer.html" title="GwyVectorLayer"><span class="type">GwyVectorLayer</span></a> *layer</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint"><span class="type">gint</span></a> focus</code></em>);</pre>
<p>Focues on one selection object.</p>
<p>When a selection object is focused, it becomes the only one user can
interact with. More precisely, "object-chosen" signal is emitted only
for this object, and if the layer is editable only this object can be
modified by the user.</p>
<div class="refsect3">
<a name="gwy-vector-layer-set-focus.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>layer</p></td>
<td class="parameter_description"><p>A vector data view layer.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>focus</p></td>
<td class="parameter_description"><p>Index of object to focus on, use -1 to unfocus (allow interaction
with any object).</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="gwy-vector-layer-set-focus.returns"></a><h4>Returns</h4>
<p> <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#TRUE:CAPS"><code class="literal">TRUE</code></a> if the object was focused, <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#FALSE:CAPS"><code class="literal">FALSE</code></a> on failure. Failure can
be caused by user currently moving another object, wrong object
index, or the feature being unimplemented in <em class="parameter"><code>layer</code></em>
.</p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gwy-vector-layer-get-editable"></a><h3>gwy_vector_layer_get_editable ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
gwy_vector_layer_get_editable (<em class="parameter"><code><a class="link" href="GwyVectorLayer.html" title="GwyVectorLayer"><span class="type">GwyVectorLayer</span></a> *layer</code></em>);</pre>
<p>Gets editability of a vector layer.</p>
<div class="refsect3">
<a name="gwy-vector-layer-get-editable.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>layer</p></td>
<td class="parameter_description"><p>A vector data view layer.</p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="gwy-vector-layer-get-editable.returns"></a><h4>Returns</h4>
<p> <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#TRUE:CAPS"><code class="literal">TRUE</code></a> if layer is edtiable, <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#FALSE:CAPS"><code class="literal">FALSE</code></a> if it is not editable.</p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gwy-vector-layer-set-editable"></a><h3>gwy_vector_layer_set_editable ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
gwy_vector_layer_set_editable (<em class="parameter"><code><a class="link" href="GwyVectorLayer.html" title="GwyVectorLayer"><span class="type">GwyVectorLayer</span></a> *layer</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a> editable</code></em>);</pre>
<p>Sets a vector layer editability.</p>
<p>It is an error to attempt to set a layer non-editabile while it is being
edited.</p>
<p>When a layer is set noneditable, the user cannot change the selection.
However, "object-chosen" signal is still emitted.</p>
<div class="refsect3">
<a name="gwy-vector-layer-set-editable.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>layer</p></td>
<td class="parameter_description"><p>A vector data view layer.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>editable</p></td>
<td class="parameter_description"><p><a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#TRUE:CAPS"><code class="literal">TRUE</code></a> to set layer editable, <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#FALSE:CAPS"><code class="literal">FALSE</code></a> to set it noneditable.</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gwy-vector-layer-draw"></a><h3>gwy_vector_layer_draw ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
gwy_vector_layer_draw (<em class="parameter"><code><a class="link" href="GwyVectorLayer.html" title="GwyVectorLayer"><span class="type">GwyVectorLayer</span></a> *layer</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/gdk2/gdk2-Drawing-Primitives.html#GdkDrawable-struct"><span class="type">GdkDrawable</span></a> *drawable</code></em>,
<em class="parameter"><code><a href="../libgwydraw-gwydrawenums.html#GwyRenderingTarget"><span class="type">GwyRenderingTarget</span></a> target</code></em>);</pre>
<p>Draws <em class="parameter"><code>layer</code></em>
on given drawable (which should be a <a class="link" href="GwyDataView.html" title="GwyDataView"><span class="type">GwyDataView</span></a> window).</p>
<div class="refsect3">
<a name="gwy-vector-layer-draw.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>layer</p></td>
<td class="parameter_description"><p>A vector data view layer.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>drawable</p></td>
<td class="parameter_description"><p>A drawable to draw on.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>target</p></td>
<td class="parameter_description"><p>Rendering target.</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gwy-vector-layer-button-press"></a><h3>gwy_vector_layer_button_press ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
gwy_vector_layer_button_press (<em class="parameter"><code><a class="link" href="GwyVectorLayer.html" title="GwyVectorLayer"><span class="type">GwyVectorLayer</span></a> *layer</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/gdk3/gdk3-Event-Structures.html#GdkEventButton"><span class="type">GdkEventButton</span></a> *event</code></em>);</pre>
<p>Sends a mouse button press event to a layer.</p>
<p>This method primarily exists for <a class="link" href="GwyDataView.html" title="GwyDataView"><span class="type">GwyDataView</span></a> to forward events to
layers. You should rarely need it.</p>
<div class="refsect3">
<a name="gwy-vector-layer-button-press.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>layer</p></td>
<td class="parameter_description"><p>A vector data view layer.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>event</p></td>
<td class="parameter_description"><p>A Gdk mouse button event.</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="gwy-vector-layer-button-press.returns"></a><h4>Returns</h4>
<p> <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#TRUE:CAPS"><code class="literal">TRUE</code></a> if the event was handled. In practice, it returns <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#FALSE:CAPS"><code class="literal">FALSE</code></a>.</p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gwy-vector-layer-button-release"></a><h3>gwy_vector_layer_button_release ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
gwy_vector_layer_button_release (<em class="parameter"><code><a class="link" href="GwyVectorLayer.html" title="GwyVectorLayer"><span class="type">GwyVectorLayer</span></a> *layer</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/gdk3/gdk3-Event-Structures.html#GdkEventButton"><span class="type">GdkEventButton</span></a> *event</code></em>);</pre>
<p>Sends a mouse button release event to a layer.</p>
<p>This method primarily exists for <a class="link" href="GwyDataView.html" title="GwyDataView"><span class="type">GwyDataView</span></a> to forward events to
layers. You should rarely need it.</p>
<div class="refsect3">
<a name="gwy-vector-layer-button-release.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>layer</p></td>
<td class="parameter_description"><p>A vector data view layer.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>event</p></td>
<td class="parameter_description"><p>A Gdk mouse button event.</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="gwy-vector-layer-button-release.returns"></a><h4>Returns</h4>
<p> <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#TRUE:CAPS"><code class="literal">TRUE</code></a> if the event was handled. In practice, it returns <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#FALSE:CAPS"><code class="literal">FALSE</code></a>.</p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gwy-vector-layer-motion-notify"></a><h3>gwy_vector_layer_motion_notify ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
gwy_vector_layer_motion_notify (<em class="parameter"><code><a class="link" href="GwyVectorLayer.html" title="GwyVectorLayer"><span class="type">GwyVectorLayer</span></a> *layer</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/gdk3/gdk3-Event-Structures.html#GdkEventMotion"><span class="type">GdkEventMotion</span></a> *event</code></em>);</pre>
<p>Sends a mouse pointer motion notification event to a layer.</p>
<p>This method primarily exists for <a class="link" href="GwyDataView.html" title="GwyDataView"><span class="type">GwyDataView</span></a> to forward events to
layers. You should rarely need it.</p>
<div class="refsect3">
<a name="gwy-vector-layer-motion-notify.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>layer</p></td>
<td class="parameter_description"><p>A vector data view layer.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>event</p></td>
<td class="parameter_description"><p>A Gdk mouse pointer motion notification event. It can be a hint.</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="gwy-vector-layer-motion-notify.returns"></a><h4>Returns</h4>
<p> <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#TRUE:CAPS"><code class="literal">TRUE</code></a> if the event was handled. In practice, it returns <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#FALSE:CAPS"><code class="literal">FALSE</code></a>.</p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gwy-vector-layer-key-press"></a><h3>gwy_vector_layer_key_press ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
gwy_vector_layer_key_press (<em class="parameter"><code><a class="link" href="GwyVectorLayer.html" title="GwyVectorLayer"><span class="type">GwyVectorLayer</span></a> *layer</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/gdk3/gdk3-Event-Structures.html#GdkEventKey"><span class="type">GdkEventKey</span></a> *event</code></em>);</pre>
<p>Sends a key press event to a layer.</p>
<p>This method primarily exists for <a class="link" href="GwyDataView.html" title="GwyDataView"><span class="type">GwyDataView</span></a> to forward events to
layers. You should rarely need it.</p>
<div class="refsect3">
<a name="gwy-vector-layer-key-press.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>layer</p></td>
<td class="parameter_description"><p>A vector data view layer.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>event</p></td>
<td class="parameter_description"><p>A Gdk key event.</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="gwy-vector-layer-key-press.returns"></a><h4>Returns</h4>
<p> <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#TRUE:CAPS"><code class="literal">TRUE</code></a> if the event was handled. In practice, it returns <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#FALSE:CAPS"><code class="literal">FALSE</code></a>.</p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gwy-vector-layer-key-release"></a><h3>gwy_vector_layer_key_release ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
gwy_vector_layer_key_release (<em class="parameter"><code><a class="link" href="GwyVectorLayer.html" title="GwyVectorLayer"><span class="type">GwyVectorLayer</span></a> *layer</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/gdk3/gdk3-Event-Structures.html#GdkEventKey"><span class="type">GdkEventKey</span></a> *event</code></em>);</pre>
<p>Sends a key release event to a layer.</p>
<p>This method primarily exists for <a class="link" href="GwyDataView.html" title="GwyDataView"><span class="type">GwyDataView</span></a> to forward events to
layers. You should rarely need it.</p>
<div class="refsect3">
<a name="gwy-vector-layer-key-release.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>layer</p></td>
<td class="parameter_description"><p>A vector data view layer.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>event</p></td>
<td class="parameter_description"><p>A Gdk key event.</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="gwy-vector-layer-key-release.returns"></a><h4>Returns</h4>
<p> <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#TRUE:CAPS"><code class="literal">TRUE</code></a> if the event was handled. In practice, it returns <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#FALSE:CAPS"><code class="literal">FALSE</code></a>.</p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gwy-vector-layer-object-chosen"></a><h3>gwy_vector_layer_object_chosen ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
gwy_vector_layer_object_chosen (<em class="parameter"><code><a class="link" href="GwyVectorLayer.html" title="GwyVectorLayer"><span class="type">GwyVectorLayer</span></a> *layer</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint"><span class="type">gint</span></a> id</code></em>);</pre>
<p>Emits "object-chosen" signal on a vector layer.</p>
<p>This function is primarily intended for layer implementations.</p>
<div class="refsect3">
<a name="gwy-vector-layer-object-chosen.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>layer</p></td>
<td class="parameter_description"><p>A vector data view layer.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>id</p></td>
<td class="parameter_description"><p>Index of the chosen object.</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
</div>
</div>
<div class="refsect1">
<a name="GwyVectorLayer.other_details"></a><h2>Types and Values</h2>
<div class="refsect2">
<a name="GwyVectorLayer-struct"></a><h3>struct GwyVectorLayer</h3>
<pre class="programlisting">struct GwyVectorLayer;</pre>
</div>
<hr>
<div class="refsect2">
<a name="GwyVectorLayerClass"></a><h3>struct GwyVectorLayerClass</h3>
<pre class="programlisting">struct GwyVectorLayerClass {
GwyDataViewLayerClass parent_class;
GType selection_type;
/* Signals */
gboolean (*object_chosen)(GwyVectorLayer *layer,
gint id);
/* Virtual table */
void (*draw)(GwyVectorLayer *layer,
GdkDrawable *drawable,
GwyRenderingTarget target);
gboolean (*button_press)(GwyVectorLayer *layer,
GdkEventButton *event);
gboolean (*button_release)(GwyVectorLayer *layer,
GdkEventButton *event);
gboolean (*motion_notify)(GwyVectorLayer *layer,
GdkEventMotion *event);
gboolean (*key_press)(GwyVectorLayer *layer,
GdkEventKey *event);
gboolean (*key_release)(GwyVectorLayer *layer,
GdkEventKey *event);
gboolean (*set_focus)(GwyVectorLayer *layer,
gint object);
void (*reserved1)(void);
void (*reserved2)(void);
void (*reserved3)(void);
void (*reserved4)(void);
};
</pre>
</div>
</div>
<div class="refsect1">
<a name="GwyVectorLayer.property-details"></a><h2>Property Details</h2>
<div class="refsect2">
<a name="GwyVectorLayer--editable"></a><h3>The <code class="literal">“editable”</code> property</h3>
<pre class="programlisting"> “editable” <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a></pre>
<p>Whether selection objects are editable.</p>
<p>Owner: GwyVectorLayer</p>
<p>Flags: Read / Write</p>
<p>Default value: TRUE</p>
</div>
<hr>
<div class="refsect2">
<a name="GwyVectorLayer--focus"></a><h3>The <code class="literal">“focus”</code> property</h3>
<pre class="programlisting"> “focus” <span class="type">int</span></pre>
<p>The id of focused object, or -1 if all objects are active.</p>
<p>Owner: GwyVectorLayer</p>
<p>Flags: Read / Write</p>
<p>Allowed values: >= -1</p>
<p>Default value: -1</p>
</div>
<hr>
<div class="refsect2">
<a name="GwyVectorLayer--selection-key"></a><h3>The <code class="literal">“selection-key”</code> property</h3>
<pre class="programlisting"> “selection-key” <span class="type">char</span> *</pre>
<p>The key identifying selection object in data container.</p>
<p>Owner: GwyVectorLayer</p>
<p>Flags: Read / Write</p>
<p>Default value: NULL</p>
</div>
</div>
<div class="refsect1">
<a name="GwyVectorLayer.signal-details"></a><h2>Signal Details</h2>
<div class="refsect2">
<a name="GwyVectorLayer-object-chosen"></a><h3>The <code class="literal">“object-chosen”</code> signal</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
user_function (<a class="link" href="GwyVectorLayer.html" title="GwyVectorLayer"><span class="type">GwyVectorLayer</span></a> *gwyvectorlayer,
<span class="type">int</span> arg1,
<a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> user_data)</pre>
<p>The ::object-chosen signal is emitted when user starts interacting
with a selection object, even before modifying it. It is emitted
even if the layer is not editable, but it is not emitted when focus
is set and the user attempts to choose a different object.</p>
<div class="refsect3">
<a name="GwyVectorLayer-object-chosen.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>gwyvectorlayer</p></td>
<td class="parameter_description"><p>The <a class="link" href="GwyVectorLayer.html" title="GwyVectorLayer"><span class="type">GwyVectorLayer</span></a> which received the signal.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>arg1</p></td>
<td class="parameter_description"><p>The number (index) of the chosen selection object.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>user_data</p></td>
<td class="parameter_description"><p>user data set when the signal handler was connected.</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<p>Flags: <a href="/usr/share/gtk-doc/html/gobject/gobject-Signals.html#G-SIGNAL-RUN-FIRST:CAPS">Run First</a></p>
</div>
</div>
<div class="refsect1">
<a name="GwyVectorLayer.see-also"></a><h2>See Also</h2>
<a class="link" href="standard-vector-layers.html" title="Standard Vector Layers">Standard vector
layers</a>
</div>
</div>
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