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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <title>GtkGestureZoom: GTK+ 3 Reference Manual</title> <meta name="generator" content="DocBook XSL Stylesheets V1.79.1"> <link rel="home" href="index.html" title="GTK+ 3 Reference Manual"> <link rel="up" href="Gestures.html" title="Gestures and event handling"> <link rel="prev" href="GtkGestureRotate.html" title="GtkGestureRotate"> <link rel="next" href="GtkGestureStylus.html" title="GtkGestureStylus"> <meta name="generator" content="GTK-Doc V1.32 (XML mode)"> <link rel="stylesheet" href="style.css" type="text/css"> </head> <body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"> <table class="navigation" id="top" width="100%" summary="Navigation header" cellpadding="2" cellspacing="5"><tr valign="middle"> <td width="100%" align="left" class="shortcuts"> <a href="#" class="shortcut">Top</a><span id="nav_description"> <span class="dim">|</span> <a href="#GtkGestureZoom.description" class="shortcut">Description</a></span><span id="nav_hierarchy"> <span class="dim">|</span> <a href="#GtkGestureZoom.object-hierarchy" class="shortcut">Object Hierarchy</a></span><span id="nav_signals"> <span class="dim">|</span> <a href="#GtkGestureZoom.signals" class="shortcut">Signals</a></span> </td> <td><a accesskey="h" href="index.html"><img src="home.png" width="16" height="16" border="0" alt="Home"></a></td> <td><a accesskey="u" href="Gestures.html"><img src="up.png" width="16" height="16" border="0" alt="Up"></a></td> <td><a accesskey="p" href="GtkGestureRotate.html"><img src="left.png" width="16" height="16" border="0" alt="Prev"></a></td> <td><a accesskey="n" href="GtkGestureStylus.html"><img src="right.png" width="16" height="16" border="0" alt="Next"></a></td> </tr></table> <div class="refentry"> <a name="GtkGestureZoom"></a><div class="titlepage"></div> <div class="refnamediv"><table width="100%"><tr> <td valign="top"> <h2><span class="refentrytitle"><a name="GtkGestureZoom.top_of_page"></a>GtkGestureZoom</span></h2> <p>GtkGestureZoom — Zoom gesture</p> </td> <td class="gallery_image" valign="top" align="right"></td> </tr></table></div> <div class="refsect1"> <a name="GtkGestureZoom.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 class="link" href="GtkGesture.html" title="GtkGesture"><span class="returnvalue">GtkGesture</span></a> * </td> <td class="function_name"> <a class="link" href="GtkGestureZoom.html#gtk-gesture-zoom-new" title="gtk_gesture_zoom_new ()">gtk_gesture_zoom_new</a> <span class="c_punctuation">()</span> </td> </tr> <tr> <td class="function_type"> <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gdouble"><span class="returnvalue">gdouble</span></a> </td> <td class="function_name"> <a class="link" href="GtkGestureZoom.html#gtk-gesture-zoom-get-scale-delta" title="gtk_gesture_zoom_get_scale_delta ()">gtk_gesture_zoom_get_scale_delta</a> <span class="c_punctuation">()</span> </td> </tr> </tbody> </table></div> </div> <div class="refsect1"> <a name="GtkGestureZoom.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="GtkGestureZoom.html#GtkGestureZoom-scale-changed" title="The “scale-changed” signal">scale-changed</a></td> <td class="signal_flags"><a href="/usr/share/gtk-doc/html/gobject/gobject-Signals.html#G-SIGNAL-RUN-FIRST:CAPS">Run First</a></td> </tr></tbody> </table></div> </div> <div class="refsect1"> <a name="GtkGestureZoom.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"> </td> <td class="function_name"><a class="link" href="GtkGestureZoom.html#GtkGestureZoom-struct" title="GtkGestureZoom">GtkGestureZoom</a></td> </tr></tbody> </table></div> </div> <div class="refsect1"> <a name="GtkGestureZoom.object-hierarchy"></a><h2>Object Hierarchy</h2> <pre class="screen"> <a href="/usr/share/gtk-doc/html/gobject/gobject-The-Base-Object-Type.html#GObject-struct">GObject</a> <span class="lineart">╰──</span> <a class="link" href="GtkEventController.html" title="GtkEventController">GtkEventController</a> <span class="lineart">╰──</span> <a class="link" href="GtkGesture.html" title="GtkGesture">GtkGesture</a> <span class="lineart">╰──</span> GtkGestureZoom </pre> </div> <div class="refsect1"> <a name="GtkGestureZoom.includes"></a><h2>Includes</h2> <pre class="synopsis">#include <gtk/gtk.h> </pre> </div> <div class="refsect1"> <a name="GtkGestureZoom.description"></a><h2>Description</h2> <p><a class="link" href="GtkGestureZoom.html" title="GtkGestureZoom"><span class="type">GtkGestureZoom</span></a> is a <a class="link" href="GtkGesture.html" title="GtkGesture"><span class="type">GtkGesture</span></a> implementation able to recognize pinch/zoom gestures, whenever the distance between both tracked sequences changes, the <a class="link" href="GtkGestureZoom.html#GtkGestureZoom-scale-changed" title="The “scale-changed” signal"><span class="type">“scale-changed”</span></a> signal is emitted to report the scale factor.</p> </div> <div class="refsect1"> <a name="GtkGestureZoom.functions_details"></a><h2>Functions</h2> <div class="refsect2"> <a name="gtk-gesture-zoom-new"></a><h3>gtk_gesture_zoom_new ()</h3> <pre class="programlisting"><a class="link" href="GtkGesture.html" title="GtkGesture"><span class="returnvalue">GtkGesture</span></a> * gtk_gesture_zoom_new (<em class="parameter"><code><a class="link" href="GtkWidget.html" title="GtkWidget"><span class="type">GtkWidget</span></a> *widget</code></em>);</pre> <p>Returns a newly created <a class="link" href="GtkGesture.html" title="GtkGesture"><span class="type">GtkGesture</span></a> that recognizes zoom in/out gestures (usually known as pinch/zoom).</p> <div class="refsect3"> <a name="gtk-gesture-zoom-new.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>widget</p></td> <td class="parameter_description"><p>a <a class="link" href="GtkWidget.html" title="GtkWidget"><span class="type">GtkWidget</span></a></p></td> <td class="parameter_annotations"> </td> </tr></tbody> </table></div> </div> <div class="refsect3"> <a name="gtk-gesture-zoom-new.returns"></a><h4>Returns</h4> <p> a newly created <a class="link" href="GtkGestureZoom.html" title="GtkGestureZoom"><span class="type">GtkGestureZoom</span></a></p> </div> <p class="since">Since: <a class="link" href="api-index-3-14.html#api-index-3.14">3.14</a></p> </div> <hr> <div class="refsect2"> <a name="gtk-gesture-zoom-get-scale-delta"></a><h3>gtk_gesture_zoom_get_scale_delta ()</h3> <pre class="programlisting"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gdouble"><span class="returnvalue">gdouble</span></a> gtk_gesture_zoom_get_scale_delta (<em class="parameter"><code><a class="link" href="GtkGestureZoom.html" title="GtkGestureZoom"><span class="type">GtkGestureZoom</span></a> *gesture</code></em>);</pre> <p>If <em class="parameter"><code>gesture</code></em> is active, this function returns the zooming difference since the gesture was recognized (hence the starting point is considered 1:1). If <em class="parameter"><code>gesture</code></em> is not active, 1 is returned.</p> <div class="refsect3"> <a name="gtk-gesture-zoom-get-scale-delta.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>gesture</p></td> <td class="parameter_description"><p>a <a class="link" href="GtkGestureZoom.html" title="GtkGestureZoom"><span class="type">GtkGestureZoom</span></a></p></td> <td class="parameter_annotations"> </td> </tr></tbody> </table></div> </div> <div class="refsect3"> <a name="gtk-gesture-zoom-get-scale-delta.returns"></a><h4>Returns</h4> <p> the scale delta</p> </div> <p class="since">Since: <a class="link" href="api-index-3-14.html#api-index-3.14">3.14</a></p> </div> </div> <div class="refsect1"> <a name="GtkGestureZoom.other_details"></a><h2>Types and Values</h2> <div class="refsect2"> <a name="GtkGestureZoom-struct"></a><h3>GtkGestureZoom</h3> <pre class="programlisting">typedef struct _GtkGestureZoom GtkGestureZoom;</pre> </div> </div> <div class="refsect1"> <a name="GtkGestureZoom.signal-details"></a><h2>Signal Details</h2> <div class="refsect2"> <a name="GtkGestureZoom-scale-changed"></a><h3>The <code class="literal">“scale-changed”</code> signal</h3> <pre class="programlisting"><span class="returnvalue">void</span> user_function (<a class="link" href="GtkGestureZoom.html" title="GtkGestureZoom"><span class="type">GtkGestureZoom</span></a> *controller, <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> scale, <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> user_data)</pre> <p>This signal is emitted whenever the distance between both tracked sequences changes.</p> <div class="refsect3"> <a name="GtkGestureZoom-scale-changed.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>controller</p></td> <td class="parameter_description"><p>the object on which the signal is emitted</p></td> <td class="parameter_annotations"> </td> </tr> <tr> <td class="parameter_name"><p>scale</p></td> <td class="parameter_description"><p>Scale delta, taking the initial state as 1:1</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> <p class="since">Since: <a class="link" href="api-index-3-14.html#api-index-3.14">3.14</a></p> </div> </div> <div class="refsect1"> <a name="GtkGestureZoom.see-also"></a><h2>See Also</h2> <p><a class="link" href="GtkGestureRotate.html" title="GtkGestureRotate"><span class="type">GtkGestureRotate</span></a></p> </div> </div> <div class="footer"> <hr>Generated by GTK-Doc V1.32</div> </body> </html>