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height="24" border="0" alt="Up"></a></td><td><a accesskey="h" href="index.html"><img src="home.png" width="24" height="24" border="0" alt="Home"></a></td><th width="100%" align="center">GTK+ Reference Manual</th><td><a accesskey="n" href="GtkScrollbar.html"><img src="right.png" width="24" height="24" border="0" alt="Next"></a></td></tr><tr><td colspan="5" class="shortcuts"><nobr><a href="#id4302788" class="shortcut">Top</a>  |  <a href="#id4303277" class="shortcut">Description</a>  |  <a href="#id4303032" class="shortcut">Object Hierarchy</a>  |  <a href="#id4303100" class="shortcut">Implemented Interfaces</a>  |  <a href="#id4303130" class="shortcut">Properties</a>  |  <a href="#id4303198" class="shortcut">Style Properties</a>  |  <a href="#id4303249" class="shortcut">Signals</a></nobr></td></tr></table><div class="refentry" lang="en"><a name="GtkScale"></a><div class="titlepage"></div><div class="refnamediv"><table width="100%"><tr><td valign="top"><h2><a name="id4302788"></a><span class="refentrytitle">GtkScale</span></h2><p>GtkScale — Base class for GtkHScale and GtkVScale</p></td><td valign="top" align="right"><img src="scales.png"></td></tr></table></div><div class="refsynopsisdiv"><h2>Synopsis</h2><pre class="synopsis">#include <gtk/gtk.h> <a class="link" href="GtkScale.html#GtkScale-struct">GtkScale</a>;void <a class="link" href="GtkScale.html#gtk-scale-set-digits">gtk_scale_set_digits</a> (<a class="link" href="GtkScale.html" title="GtkScale">GtkScale</a> *scale, <ahref="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint">gint</a> digits);void <a class="link" href="GtkScale.html#gtk-scale-set-draw-value">gtk_scale_set_draw_value</a> (<a class="link" href="GtkScale.html" title="GtkScale">GtkScale</a> *scale, <ahref="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean">gboolean</a> draw_value);void <a class="link" href="GtkScale.html#gtk-scale-set-value-pos">gtk_scale_set_value_pos</a> (<a class="link" href="GtkScale.html" title="GtkScale">GtkScale</a> *scale, <a class="link" href="gtk-Standard-Enumerations.html#GtkPositionType">GtkPositionType</a> pos);<ahref="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint">gint</a> <a class="link" href="GtkScale.html#gtk-scale-get-digits">gtk_scale_get_digits</a> (<a class="link" href="GtkScale.html" title="GtkScale">GtkScale</a> *scale);<ahref="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean">gboolean</a> <a class="link" href="GtkScale.html#gtk-scale-get-draw-value">gtk_scale_get_draw_value</a> (<a class="link" href="GtkScale.html" title="GtkScale">GtkScale</a> *scale);<a class="link" href="gtk-Standard-Enumerations.html#GtkPositionType">GtkPositionType</a> <a class="link" href="GtkScale.html#gtk-scale-get-value-pos">gtk_scale_get_value_pos</a> (<a class="link" href="GtkScale.html" title="GtkScale">GtkScale</a> *scale);<ahref="/usr/share/gtk-doc/html/pango/pango-Layout-Objects.html#PangoLayout">PangoLayout</a>* <a class="link" href="GtkScale.html#gtk-scale-get-layout">gtk_scale_get_layout</a> (<a class="link" href="GtkScale.html" title="GtkScale">GtkScale</a> *scale);void <a class="link" href="GtkScale.html#gtk-scale-get-layout-offsets">gtk_scale_get_layout_offsets</a> (<a class="link" href="GtkScale.html" title="GtkScale">GtkScale</a> *scale, <ahref="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint">gint</a> *x, <ahref="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint">gint</a> *y);</pre></div><div class="refsect1" lang="en"><a name="id4303032"></a><h2>Object Hierarchy</h2><pre class="synopsis"> <ahref="/usr/share/gtk-doc/html/gobject/gobject-The-Base-Object-Type.html#GObject">GObject</a> +----<ahref="/usr/share/gtk-doc/html/gobject/gobject-The-Base-Object-Type.html#GInitiallyUnowned">GInitiallyUnowned</a> +----<a class="link" href="GtkObject.html" title="GtkObject">GtkObject</a> +----<a class="link" href="GtkWidget.html" title="GtkWidget">GtkWidget</a> +----<a class="link" href="GtkRange.html" title="GtkRange">GtkRange</a> +----GtkScale +----<a class="link" href="GtkHScale.html" title="GtkHScale">GtkHScale</a> +----<a class="link" href="GtkVScale.html" title="GtkVScale">GtkVScale</a></pre></div><div class="refsect1" lang="en"><a name="id4303100"></a><h2>Implemented Interfaces</h2><p>GtkScale implements AtkImplementorIface and <a class="link" href="gtk-gtkbuildable.html#GtkBuildable">GtkBuildable</a>.</p></div><div class="refsect1" lang="en"><a name="id4303130"></a><h2>Properties</h2><pre class="synopsis"> "<a class="link" href="GtkScale.html#GtkScale--digits">digits</a>" <ahref="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint">gint</a> : Read / Write "<a class="link" href="GtkScale.html#GtkScale--draw-value">draw-value</a>" <ahref="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean">gboolean</a> : Read / Write "<a class="link" href="GtkScale.html#GtkScale--value-pos">value-pos</a>" <a class="link" href="gtk-Standard-Enumerations.html#GtkPositionType">GtkPositionType</a> : Read / Write</pre></div><div class="refsect1" lang="en"><a name="id4303198"></a><h2>Style Properties</h2><pre class="synopsis"> "<a class="link" href="GtkScale.html#GtkScale--slider-length">slider-length</a>" <ahref="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint">gint</a> : Read "<a class="link" href="GtkScale.html#GtkScale--value-spacing">value-spacing</a>" <ahref="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint">gint</a> : Read</pre></div><div class="refsect1" lang="en"><a name="id4303249"></a><h2>Signals</h2><pre class="synopsis"> "<a class="link" href="GtkScale.html#GtkScale-format-value">format-value</a>" : Run Last</pre></div><div class="refsect1" lang="en"><a name="id4303277"></a><h2>Description</h2><p>A <a class="link" href="GtkScale.html" title="GtkScale"><span class="type">GtkScale</span></a> is a slider control used to select a numeric value.To use it, you'll probably want to investigate the methods on its base class, <a class="link" href="GtkRange.html" title="GtkRange"><span class="type">GtkRange</span></a>, in addition to the methods for <a class="link" href="GtkScale.html" title="GtkScale"><span class="type">GtkScale</span></a> itself.To set the value of a scale, you would normally use <a class="link" href="GtkRange.html#gtk-range-set-value"><code class="function">gtk_range_set_value()</code></a>. To detect changes to the value, you would normally use the "value_changed" signal.</p><p>The <a class="link" href="GtkScale.html" title="GtkScale"><span class="type">GtkScale</span></a> widget is an abstract class, used only for deriving thesubclasses <a class="link" href="GtkHScale.html" title="GtkHScale"><span class="type">GtkHScale</span></a> and <a class="link" href="GtkVScale.html" title="GtkVScale"><span class="type">GtkVScale</span></a>. To create a scale widget, call <a class="link" href="GtkHScale.html#gtk-hscale-new-with-range"><code class="function">gtk_hscale_new_with_range()</code></a> or <a class="link" href="GtkVScale.html#gtk-vscale-new-with-range"><code class="function">gtk_vscale_new_with_range()</code></a>.</p></div><div class="refsect1" lang="en"><a name="id4303382"></a><h2>Details</h2><div class="refsect2" lang="en"><a name="id4303392"></a><h3><a name="GtkScale-struct"></a>GtkScale</h3><a class="indexterm" name="id4303405"></a><pre class="programlisting">typedef struct _GtkScale GtkScale;</pre><p>The <a class="link" href="GtkScale.html#GtkScale-struct"><span class="type">GtkScale</span></a> struct contains the following fields.(These fields should be considered read-only. They should never be set byan application.)</p><div class="informaltable"><table width="100%" border="0"><colgroup><col><col></colgroup><tbody><tr><td><ahref="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guint"><span class="type">guint</span></a> <em class="structfield"><code>draw_value</code></em>;</td><td>non-zero if the scale's current value is displayed next to theslider.</td></tr><tr><td><ahref="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guint"><span class="type">guint</span></a> <em class="structfield"><code>value_pos</code></em>;</td><td>the position in which the textual value is displayed, selected from<a class="link" href="gtk-Standard-Enumerations.html#GtkPositionType"><span class="type">GtkPositionType</span></a>.</td></tr></tbody></table></div><p></p></div><hr><div class="refsect2" lang="en"><a name="id4303507"></a><h3><a name="gtk-scale-set-digits"></a>gtk_scale_set_digits ()</h3><a class="indexterm" name="id4303520"></a><pre class="programlisting">void gtk_scale_set_digits (<a class="link" href="GtkScale.html" title="GtkScale">GtkScale</a> *scale, <ahref="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint">gint</a> digits);</pre><p>Sets the number of decimal places that are displayed in the value. Also causesthe value of the adjustment to be rounded off to this number of digits, so theretrieved value matches the value the user saw.</p><div class="variablelist"><table border="0"><col align="left" valign="top"><tbody><tr><td><p><span class="term"><em class="parameter"><code>scale</code></em> :</span></p></td><td>a <a class="link" href="GtkScale.html" title="GtkScale"><span class="type">GtkScale</span></a>.</td></tr><tr><td><p><span class="term"><em class="parameter"><code>digits</code></em> :</span></p></td><td>the number of decimal places to display, e.g. use 1 to display 1.0,2 to display 1.00 etc.</td></tr></tbody></table></div></div><hr><div class="refsect2" lang="en"><a name="id4303601"></a><h3><a name="gtk-scale-set-draw-value"></a>gtk_scale_set_draw_value ()</h3><a class="indexterm" name="id4303614"></a><pre class="programlisting">void gtk_scale_set_draw_value (<a class="link" href="GtkScale.html" title="GtkScale">GtkScale</a> *scale, <ahref="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean">gboolean</a> draw_value);</pre><p>Specifies whether the current value is displayed as a string next to theslider.</p><div class="variablelist"><table border="0"><col align="left" valign="top"><tbody><tr><td><p><span class="term"><em class="parameter"><code>scale</code></em> :</span></p></td><td>a <a class="link" href="GtkScale.html" title="GtkScale"><span class="type">GtkScale</span></a>.</td></tr><tr><td><p><span class="term"><em class="parameter"><code>draw_value</code></em> :</span></p></td><td>a boolean.</td></tr></tbody></table></div></div><hr><div class="refsect2" lang="en"><a name="id4303692"></a><h3><a name="gtk-scale-set-value-pos"></a>gtk_scale_set_value_pos ()</h3><a class="indexterm" name="id4303705"></a><pre class="programlisting">void gtk_scale_set_value_pos (<a class="link" href="GtkScale.html" title="GtkScale">GtkScale</a> *scale, <a class="link" href="gtk-Standard-Enumerations.html#GtkPositionType">GtkPositionType</a> pos);</pre><p>Sets the position in which the current value is displayed.</p><div class="variablelist"><table border="0"><col align="left" valign="top"><tbody><tr><td><p><span class="term"><em class="parameter"><code>scale</code></em> :</span></p></td>⌨️ 快捷键说明
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