263 lines
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263 lines
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<title>gimpundo</title>
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<td><a accesskey="p" href="libgimp-gimptransformtools.html"><img src="left.png" width="24" height="24" border="0" alt="Prev"></a></td>
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<a href="#libgimp-gimpundo.synopsis" class="shortcut">Top</a>
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<a href="#libgimp-gimpundo.description" class="shortcut">Description</a>
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<div class="refentry">
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<a name="libgimp-gimpundo"></a><div class="titlepage"></div>
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<div class="refnamediv"><table width="100%"><tr>
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<td valign="top">
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<h2><span class="refentrytitle"><a name="libgimp-gimpundo.top_of_page"></a>gimpundo</span></h2>
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<p>gimpundo — Control of undo/redo.</p>
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</td>
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<td valign="top" align="right"></td>
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</tr></table></div>
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<div class="refsynopsisdiv">
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<a name="libgimp-gimpundo.synopsis"></a><h2>Synopsis</h2>
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<pre class="synopsis"><span class="returnvalue">gboolean</span> <a class="link" href="libgimp-gimpundo.html#gimp-image-undo-group-start" title="gimp_image_undo_group_start ()">gimp_image_undo_group_start</a> (<em class="parameter"><code><span class="type">gint32</span> image_ID</code></em>);
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<span class="returnvalue">gboolean</span> <a class="link" href="libgimp-gimpundo.html#gimp-image-undo-group-end" title="gimp_image_undo_group_end ()">gimp_image_undo_group_end</a> (<em class="parameter"><code><span class="type">gint32</span> image_ID</code></em>);
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<span class="returnvalue">gboolean</span> <a class="link" href="libgimp-gimpundo.html#gimp-image-undo-is-enabled" title="gimp_image_undo_is_enabled ()">gimp_image_undo_is_enabled</a> (<em class="parameter"><code><span class="type">gint32</span> image_ID</code></em>);
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<span class="returnvalue">gboolean</span> <a class="link" href="libgimp-gimpundo.html#gimp-image-undo-disable" title="gimp_image_undo_disable ()">gimp_image_undo_disable</a> (<em class="parameter"><code><span class="type">gint32</span> image_ID</code></em>);
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<span class="returnvalue">gboolean</span> <a class="link" href="libgimp-gimpundo.html#gimp-image-undo-enable" title="gimp_image_undo_enable ()">gimp_image_undo_enable</a> (<em class="parameter"><code><span class="type">gint32</span> image_ID</code></em>);
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<span class="returnvalue">gboolean</span> <a class="link" href="libgimp-gimpundo.html#gimp-image-undo-freeze" title="gimp_image_undo_freeze ()">gimp_image_undo_freeze</a> (<em class="parameter"><code><span class="type">gint32</span> image_ID</code></em>);
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<span class="returnvalue">gboolean</span> <a class="link" href="libgimp-gimpundo.html#gimp-image-undo-thaw" title="gimp_image_undo_thaw ()">gimp_image_undo_thaw</a> (<em class="parameter"><code><span class="type">gint32</span> image_ID</code></em>);
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</pre>
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</div>
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<div class="refsect1">
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<a name="libgimp-gimpundo.description"></a><h2>Description</h2>
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<p>
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Control of undo/redo.
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</p>
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</div>
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<div class="refsect1">
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<a name="libgimp-gimpundo.details"></a><h2>Details</h2>
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<div class="refsect2">
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<a name="gimp-image-undo-group-start"></a><h3>gimp_image_undo_group_start ()</h3>
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<pre class="programlisting"><span class="returnvalue">gboolean</span> gimp_image_undo_group_start (<em class="parameter"><code><span class="type">gint32</span> image_ID</code></em>);</pre>
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<p>
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Starts a group undo.
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</p>
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<p>
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This function is used to start a group undo--necessary for logically
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combining two or more undo operations into a single operation. This
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call must be used in conjunction with a <a class="link" href="libgimp-gimpundo.html#gimp-image-undo-group-end" title="gimp_image_undo_group_end ()"><code class="function">gimp_image_undo_group_end()</code></a>
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call.
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</p>
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<div class="variablelist"><table border="0">
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<col align="left" valign="top">
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<tbody>
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<tr>
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<td><p><span class="term"><em class="parameter"><code>image_ID</code></em> :</span></p></td>
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<td>The ID of the image in which to open an undo group.</td>
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</tr>
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<tr>
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<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
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<td>TRUE on success.</td>
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</tr>
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</tbody>
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</table></div>
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</div>
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<hr>
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<div class="refsect2">
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<a name="gimp-image-undo-group-end"></a><h3>gimp_image_undo_group_end ()</h3>
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<pre class="programlisting"><span class="returnvalue">gboolean</span> gimp_image_undo_group_end (<em class="parameter"><code><span class="type">gint32</span> image_ID</code></em>);</pre>
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<p>
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Finish a group undo.
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</p>
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<p>
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This function must be called once for each
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<a class="link" href="libgimp-gimpundo.html#gimp-image-undo-group-start" title="gimp_image_undo_group_start ()"><code class="function">gimp_image_undo_group_start()</code></a> call that is made.
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</p>
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<div class="variablelist"><table border="0">
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<col align="left" valign="top">
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<tbody>
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<tr>
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<td><p><span class="term"><em class="parameter"><code>image_ID</code></em> :</span></p></td>
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<td>The ID of the image in which to close an undo group.</td>
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</tr>
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<tr>
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<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
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<td>TRUE on success.</td>
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</tr>
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</tbody>
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</table></div>
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</div>
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<hr>
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<div class="refsect2">
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<a name="gimp-image-undo-is-enabled"></a><h3>gimp_image_undo_is_enabled ()</h3>
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<pre class="programlisting"><span class="returnvalue">gboolean</span> gimp_image_undo_is_enabled (<em class="parameter"><code><span class="type">gint32</span> image_ID</code></em>);</pre>
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<p>
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Check if the image's undo stack is enabled.
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</p>
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<p>
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This procedure checks if the image's undo stack is currently enabled
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or disabled. This is useful when several plugins or scripts call
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each other and want to check if their caller has already used
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<a class="link" href="libgimp-gimpundo.html#gimp-image-undo-disable" title="gimp_image_undo_disable ()"><code class="function">gimp_image_undo_disable()</code></a> or <a class="link" href="libgimp-gimpundo.html#gimp-image-undo-freeze" title="gimp_image_undo_freeze ()"><code class="function">gimp_image_undo_freeze()</code></a>.
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</p>
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<div class="variablelist"><table border="0">
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<col align="left" valign="top">
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<tbody>
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<tr>
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<td><p><span class="term"><em class="parameter"><code>image_ID</code></em> :</span></p></td>
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<td>The image.</td>
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</tr>
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<tr>
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<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
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<td>TRUE if undo is enabled for this image.</td>
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</tr>
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</tbody>
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</table></div>
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</div>
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<hr>
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<div class="refsect2">
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<a name="gimp-image-undo-disable"></a><h3>gimp_image_undo_disable ()</h3>
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<pre class="programlisting"><span class="returnvalue">gboolean</span> gimp_image_undo_disable (<em class="parameter"><code><span class="type">gint32</span> image_ID</code></em>);</pre>
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<p>
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Disable the image's undo stack.
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</p>
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<p>
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This procedure disables the image's undo stack, allowing subsequent
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operations to ignore their undo steps. This is generally called in
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conjunction with <a class="link" href="libgimp-gimpundo.html#gimp-image-undo-enable" title="gimp_image_undo_enable ()"><code class="function">gimp_image_undo_enable()</code></a> to temporarily disable an
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image undo stack. This is advantageous because saving undo steps can
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be time and memory intensive.
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</p>
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<div class="variablelist"><table border="0">
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<col align="left" valign="top">
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<tbody>
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<tr>
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<td><p><span class="term"><em class="parameter"><code>image_ID</code></em> :</span></p></td>
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<td>The image.</td>
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</tr>
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<tr>
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<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
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<td>TRUE if the image undo has been disabled.</td>
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</tr>
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</tbody>
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</table></div>
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</div>
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<hr>
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<div class="refsect2">
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<a name="gimp-image-undo-enable"></a><h3>gimp_image_undo_enable ()</h3>
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<pre class="programlisting"><span class="returnvalue">gboolean</span> gimp_image_undo_enable (<em class="parameter"><code><span class="type">gint32</span> image_ID</code></em>);</pre>
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<p>
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Enable the image's undo stack.
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</p>
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<p>
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This procedure enables the image's undo stack, allowing subsequent
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operations to store their undo steps. This is generally called in
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conjunction with <a class="link" href="libgimp-gimpundo.html#gimp-image-undo-disable" title="gimp_image_undo_disable ()"><code class="function">gimp_image_undo_disable()</code></a> to temporarily disable an
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image undo stack.
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</p>
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<div class="variablelist"><table border="0">
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<col align="left" valign="top">
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<tbody>
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<tr>
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<td><p><span class="term"><em class="parameter"><code>image_ID</code></em> :</span></p></td>
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<td>The image.</td>
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</tr>
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<tr>
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<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
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<td>TRUE if the image undo has been enabled.</td>
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</tr>
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</tbody>
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</table></div>
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</div>
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<hr>
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<div class="refsect2">
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<a name="gimp-image-undo-freeze"></a><h3>gimp_image_undo_freeze ()</h3>
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<pre class="programlisting"><span class="returnvalue">gboolean</span> gimp_image_undo_freeze (<em class="parameter"><code><span class="type">gint32</span> image_ID</code></em>);</pre>
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<p>
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Freeze the image's undo stack.
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</p>
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<p>
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This procedure freezes the image's undo stack, allowing subsequent
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operations to ignore their undo steps. This is generally called in
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conjunction with <a class="link" href="libgimp-gimpundo.html#gimp-image-undo-thaw" title="gimp_image_undo_thaw ()"><code class="function">gimp_image_undo_thaw()</code></a> to temporarily disable an
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image undo stack. This is advantageous because saving undo steps can
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be time and memory intensive. <a class="link" href="libgimp-gimpundo.html#gimp-image-undo-freeze" title="gimp_image_undo_freeze ()"><code class="function">gimp_image_undo_freeze()</code></a> /
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<a class="link" href="libgimp-gimpundo.html#gimp-image-undo-thaw" title="gimp_image_undo_thaw ()"><code class="function">gimp_image_undo_thaw()</code></a> and <a class="link" href="libgimp-gimpundo.html#gimp-image-undo-disable" title="gimp_image_undo_disable ()"><code class="function">gimp_image_undo_disable()</code></a> /
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<a class="link" href="libgimp-gimpundo.html#gimp-image-undo-enable" title="gimp_image_undo_enable ()"><code class="function">gimp_image_undo_enable()</code></a> differ in that the former does not free up
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all undo steps when undo is thawed, so is more suited to interactive
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in-situ previews. It is important in this case that the image is
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back to the same state it was frozen in before thawing, else 'undo'
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behaviour is undefined.
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</p>
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<div class="variablelist"><table border="0">
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<col align="left" valign="top">
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<tbody>
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<tr>
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<td><p><span class="term"><em class="parameter"><code>image_ID</code></em> :</span></p></td>
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<td>The image.</td>
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</tr>
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<tr>
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<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
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<td>TRUE if the image undo has been frozen.</td>
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</tr>
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</tbody>
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</table></div>
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</div>
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<hr>
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<div class="refsect2">
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<a name="gimp-image-undo-thaw"></a><h3>gimp_image_undo_thaw ()</h3>
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<pre class="programlisting"><span class="returnvalue">gboolean</span> gimp_image_undo_thaw (<em class="parameter"><code><span class="type">gint32</span> image_ID</code></em>);</pre>
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<p>
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Thaw the image's undo stack.
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</p>
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<p>
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This procedure thaws the image's undo stack, allowing subsequent
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operations to store their undo steps. This is generally called in
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conjunction with <a class="link" href="libgimp-gimpundo.html#gimp-image-undo-freeze" title="gimp_image_undo_freeze ()"><code class="function">gimp_image_undo_freeze()</code></a> to temporarily freeze an
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image undo stack. <a class="link" href="libgimp-gimpundo.html#gimp-image-undo-thaw" title="gimp_image_undo_thaw ()"><code class="function">gimp_image_undo_thaw()</code></a> does NOT free the undo
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stack as <a class="link" href="libgimp-gimpundo.html#gimp-image-undo-enable" title="gimp_image_undo_enable ()"><code class="function">gimp_image_undo_enable()</code></a> does, so is suited for situations
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where one wishes to leave the undo stack in the same state in which
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one found it despite non-destructively playing with the image in the
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meantime. An example would be in-situ plugin previews. Balancing
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freezes and thaws and ensuring image consistancy is the
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responsibility of the caller.
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</p>
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<div class="variablelist"><table border="0">
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<col align="left" valign="top">
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<tbody>
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<tr>
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<td><p><span class="term"><em class="parameter"><code>image_ID</code></em> :</span></p></td>
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<td>The image.</td>
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</tr>
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<tr>
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<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
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<td>TRUE if the image undo has been thawed.</td>
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</tr>
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</tbody>
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</table></div>
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</div>
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</div>
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</div>
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<div class="footer">
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<hr>
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