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<title>Gwyddion Widgets Library Reference Manual: GwyPixmapLayer</title>
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<h2><span class="refentrytitle"><a name="GwyPixmapLayer.top_of_page"></a>GwyPixmapLayer</span></h2>
<p>GwyPixmapLayer — Base class for GwyDataView pixmap layers</p>
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<div class="refsynopsisdiv">
<a name="GwyPixmapLayer.synopsis"></a><h2>Synopsis</h2>
<pre class="synopsis">
#include <libgwydgets/gwydgets.h>
struct <a class="link" href="GwyPixmapLayer.html#GwyPixmapLayer-struct" title="struct GwyPixmapLayer">GwyPixmapLayer</a>;
struct <a class="link" href="GwyPixmapLayer.html#GwyPixmapLayerClass" title="struct GwyPixmapLayerClass">GwyPixmapLayerClass</a>;
<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="GwyPixmapLayer.html#gwy-pixmap-layer-wants-repaint" title="gwy_pixmap_layer_wants_repaint ()">gwy_pixmap_layer_wants_repaint</a> (<em class="parameter"><code><a class="link" href="GwyPixmapLayer.html" title="GwyPixmapLayer"><span class="type">GwyPixmapLayer</span></a> *pixmap_layer</code></em>);
<a href="http://developer.gnome.org/doc/API/2.0/gdk-pixbuf/gdk-pixbuf-The-GdkPixbuf-Structure.html#GdkPixbuf"><span class="returnvalue">GdkPixbuf</span></a> * <a class="link" href="GwyPixmapLayer.html#gwy-pixmap-layer-paint" title="gwy_pixmap_layer_paint ()">gwy_pixmap_layer_paint</a> (<em class="parameter"><code><a class="link" href="GwyPixmapLayer.html" title="GwyPixmapLayer"><span class="type">GwyPixmapLayer</span></a> *pixmap_layer</code></em>);
<span class="returnvalue">void</span> <a class="link" href="GwyPixmapLayer.html#gwy-pixmap-layer-set-data-key" title="gwy_pixmap_layer_set_data_key ()">gwy_pixmap_layer_set_data_key</a> (<em class="parameter"><code><a class="link" href="GwyPixmapLayer.html" title="GwyPixmapLayer"><span class="type">GwyPixmapLayer</span></a> *pixmap_layer</code></em>,
<em class="parameter"><code>const <a href="http://developer.gnome.org/doc/API/2.0/glib/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *key</code></em>);
const <a href="http://developer.gnome.org/doc/API/2.0/glib/glib-Basic-Types.html#gchar"><span class="returnvalue">gchar</span></a> * <a class="link" href="GwyPixmapLayer.html#gwy-pixmap-layer-get-data-key" title="gwy_pixmap_layer_get_data_key ()">gwy_pixmap_layer_get_data_key</a> (<em class="parameter"><code><a class="link" href="GwyPixmapLayer.html" title="GwyPixmapLayer"><span class="type">GwyPixmapLayer</span></a> *pixmap_layer</code></em>);
<span class="returnvalue">void</span> <a class="link" href="GwyPixmapLayer.html#gwy-pixmap-layer-make-pixbuf" title="gwy_pixmap_layer_make_pixbuf ()">gwy_pixmap_layer_make_pixbuf</a> (<em class="parameter"><code><a class="link" href="GwyPixmapLayer.html" title="GwyPixmapLayer"><span class="type">GwyPixmapLayer</span></a> *pixmap_layer</code></em>,
<em class="parameter"><code><a href="http://developer.gnome.org/doc/API/2.0/glib/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a> has_alpha</code></em>);
</pre>
</div>
<div class="refsect1">
<a name="GwyPixmapLayer.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>
+----<a href="http://developer.gnome.org/doc/API/2.0/gobject/gobject-The-Base-Object-Type.html#GInitiallyUnowned">GInitiallyUnowned</a>
+----<a href="http://developer.gnome.org/doc/API/2.0/gtk/GtkObject.html">GtkObject</a>
+----<a class="link" href="GwyDataViewLayer.html" title="GwyDataViewLayer">GwyDataViewLayer</a>
+----GwyPixmapLayer
+----<a class="link" href="GwyLayerBasic.html" title="GwyLayerBasic">GwyLayerBasic</a>
+----<a class="link" href="GwyLayerMask.html" title="GwyLayerMask">GwyLayerMask</a>
</pre>
</div>
<div class="refsect1">
<a name="GwyPixmapLayer.properties"></a><h2>Properties</h2>
<pre class="synopsis">
"<a class="link" href="GwyPixmapLayer.html#GwyPixmapLayer--data-key" title='The "data-key" property'>data-key</a>" <a href="http://developer.gnome.org/doc/API/2.0/glib/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a>* : Read / Write
</pre>
</div>
<div class="refsect1">
<a name="GwyPixmapLayer.description"></a><h2>Description</h2>
<p>
<a class="link" href="GwyPixmapLayer.html" title="GwyPixmapLayer"><span class="type">GwyPixmapLayer</span></a> is a base class for data field displaying
<a class="link" href="GwyDataViewLayer.html" title="GwyDataViewLayer"><span class="type">GwyDataViewLayer</span></a>'s. 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 data field to display from its parent <a class="link" href="GwyDataView.html" title="GwyDataView"><span class="type">GwyDataView</span></a>.
The key under which the data field is found must be set with
<a class="link" href="GwyPixmapLayer.html#gwy-pixmap-layer-set-data-key" title="gwy_pixmap_layer_set_data_key ()"><code class="function">gwy_pixmap_layer_set_data_key()</code></a>.
</p>
<p>
The other methods are only rarely needed outside <a class="link" href="GwyDataView.html" title="GwyDataView"><span class="type">GwyDataView</span></a>
implementation.
</p>
</div>
<div class="refsect1">
<a name="GwyPixmapLayer.details"></a><h2>Details</h2>
<div class="refsect2">
<a name="GwyPixmapLayer-struct"></a><h3>struct GwyPixmapLayer</h3>
<pre class="programlisting">struct GwyPixmapLayer;</pre>
<p>
</p>
</div>
<hr>
<div class="refsect2">
<a name="GwyPixmapLayerClass"></a><h3>struct GwyPixmapLayerClass</h3>
<pre class="programlisting">struct GwyPixmapLayerClass {
GwyDataViewLayerClass parent_class;
GdkPixbuf* (*paint)(GwyPixmapLayer *layer);
void (*reserved1)(void);
void (*reserved2)(void);
};
</pre>
<p>
</p>
</div>
<hr>
<div class="refsect2">
<a name="gwy-pixmap-layer-wants-repaint"></a><h3>gwy_pixmap_layer_wants_repaint ()</h3>
<pre class="programlisting"><a href="http://developer.gnome.org/doc/API/2.0/glib/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a> gwy_pixmap_layer_wants_repaint (<em class="parameter"><code><a class="link" href="GwyPixmapLayer.html" title="GwyPixmapLayer"><span class="type">GwyPixmapLayer</span></a> *pixmap_layer</code></em>);</pre>
<p>
Checks whether a pixmap layer wants repaint.
</p>
<div class="variablelist"><table border="0" class="variablelist">
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<td><p><span class="term"><em class="parameter"><code>pixmap_layer</code></em> :</span></p></td>
<td>A pixmap data view layer.</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>
<a href="http://developer.gnome.org/doc/API/2.0/glib/glib-Standard-Macros.html#TRUE:CAPS"><code class="literal">TRUE</code></a> if the the layer wants repaint itself, <a href="http://developer.gnome.org/doc/API/2.0/glib/glib-Standard-Macros.html#FALSE:CAPS"><code class="literal">FALSE</code></a> otherwise.</td>
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</tbody>
</table></div>
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<hr>
<div class="refsect2">
<a name="gwy-pixmap-layer-paint"></a><h3>gwy_pixmap_layer_paint ()</h3>
<pre class="programlisting"><a href="http://developer.gnome.org/doc/API/2.0/gdk-pixbuf/gdk-pixbuf-The-GdkPixbuf-Structure.html#GdkPixbuf"><span class="returnvalue">GdkPixbuf</span></a> * gwy_pixmap_layer_paint (<em class="parameter"><code><a class="link" href="GwyPixmapLayer.html" title="GwyPixmapLayer"><span class="type">GwyPixmapLayer</span></a> *pixmap_layer</code></em>);</pre>
<p>
Returns a pixbuf with painted pixmap layer.
</p>
<p>
This method does not enforce repaint. If the layer doesn't think it needs
to repaint the pixbuf, it simply returns the current one. To enforce
update, emit "data-changed" signal on corresponding data field.
</p>
<div class="variablelist"><table border="0" class="variablelist">
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<td><p><span class="term"><em class="parameter"><code>pixmap_layer</code></em> :</span></p></td>
<td>A pixmap data view layer.</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>The pixbuf. It should not be modified or freed. If the data field
to draw is not present in the container, <a href="http://developer.gnome.org/doc/API/2.0/glib/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a> is returned.</td>
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<hr>
<div class="refsect2">
<a name="gwy-pixmap-layer-set-data-key"></a><h3>gwy_pixmap_layer_set_data_key ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> gwy_pixmap_layer_set_data_key (<em class="parameter"><code><a class="link" href="GwyPixmapLayer.html" title="GwyPixmapLayer"><span class="type">GwyPixmapLayer</span></a> *pixmap_layer</code></em>,
<em class="parameter"><code>const <a href="http://developer.gnome.org/doc/API/2.0/glib/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *key</code></em>);</pre>
<p>
Sets the data field to display by a pixmap layer.
</p>
<div class="variablelist"><table border="0" class="variablelist">
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<col align="left" valign="top">
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<td><p><span class="term"><em class="parameter"><code>pixmap_layer</code></em> :</span></p></td>
<td>A pixmap layer.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>key</code></em> :</span></p></td>
<td>Container string key identifying the data field to display.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gwy-pixmap-layer-get-data-key"></a><h3>gwy_pixmap_layer_get_data_key ()</h3>
<pre class="programlisting">const <a href="http://developer.gnome.org/doc/API/2.0/glib/glib-Basic-Types.html#gchar"><span class="returnvalue">gchar</span></a> * gwy_pixmap_layer_get_data_key (<em class="parameter"><code><a class="link" href="GwyPixmapLayer.html" title="GwyPixmapLayer"><span class="type">GwyPixmapLayer</span></a> *pixmap_layer</code></em>);</pre>
<p>
Gets the key identifying data field this pixmap layer displays.
</p>
<div class="variablelist"><table border="0" class="variablelist">
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<col align="left" valign="top">
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<td><p><span class="term"><em class="parameter"><code>pixmap_layer</code></em> :</span></p></td>
<td>A pixmap layer.</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>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.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gwy-pixmap-layer-make-pixbuf"></a><h3>gwy_pixmap_layer_make_pixbuf ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> gwy_pixmap_layer_make_pixbuf (<em class="parameter"><code><a class="link" href="GwyPixmapLayer.html" title="GwyPixmapLayer"><span class="type">GwyPixmapLayer</span></a> *pixmap_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> has_alpha</code></em>);</pre>
<p>
Creates or resizes pixmap layer <a href="/usr/share/gtk-doc/html/gdk-pixbuf/gdk-pixbuf-The-GdkPixbuf-Structure.html#GdkPixbuf"><span class="type">GdkPixbuf</span></a> to match its data field.
</p>
<p>
This method is intended for pixmap layer implementation.
</p>
<div class="variablelist"><table border="0" class="variablelist">
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<col align="left" valign="top">
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<td><p><span class="term"><em class="parameter"><code>pixmap_layer</code></em> :</span></p></td>
<td>A pixmap layer.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>has_alpha</code></em> :</span></p></td>
<td>Whether pixbuf should have alpha channel.</td>
</tr>
</tbody>
</table></div>
</div>
</div>
<div class="refsect1">
<a name="GwyPixmapLayer.property-details"></a><h2>Property Details</h2>
<div class="refsect2">
<a name="GwyPixmapLayer--data-key"></a><h3>The <code class="literal">"data-key"</code> property</h3>
<pre class="programlisting"> "data-key" <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a>* : Read / Write</pre>
<p>
The :data-key property is the container key used to identify
displayed <a href="../libgwyprocess/GwyDataField.html"><span class="type">GwyDataField</span></a> in container.
</p>
<p>Default value: NULL</p>
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