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<HTML><HEAD><TITLE>Example</TITLE><METANAME="GENERATOR"CONTENT="Modular DocBook HTML Stylesheet Version 1.49"><LINKREL="HOME"TITLE="GTK+ 1.2 Tutorial"HREF="gtk-tut.html"><LINKREL="UP"TITLE="Range Widgets"HREF="ch-rangewidgets.html"><LINKREL="PREVIOUS"TITLE="Key and Mouse bindings"HREF="sec-keyandmousebindings.html"><LINKREL="NEXT"TITLE="Miscellaneous Widgets"HREF="ch-miscwidgets.html"></HEAD></head><body bgcolor="#FFFFFF" marginheight=0 marginwidth=0 width="100%"><table cellspacing=6 border=0 cellpadding=0 width="100%"> <tr> <td bgcolor="#FFFFFF" valign=top nowrap> <centeR><A HREF="/"><img src="/images/gtk-logo-rgb.gif" width=107 height=140 border=0></A> <font face="helvetica,lucidia" color="#000000"><BR><BR><b>GTK+<BR>The GIMP Toolkit</b></center><BR><table width=100% cellspacing=0 cellpadding=2 border=0><tr><td bgcolor="#000000"><table width=100% cellspacing=0 cellpadding=4 border=0><tr><td bgcolor="#AAAAEE" nowrap><B>General</B></td></tr><tr><td bgcolor="#FFFFFF" nowrap><A HREF="/">Introduction</A><BR><A HREF="/screenshots/">Screenshots</A><br><A HREF="/download/">Download</A><br><A HREF="/mailinglists.html">Mailing Lists</A><BR><A HREF="/bindings.html">Language Bindings</A><BR><A HREF="http://gtk.themes.org/">Themes</A><BR><A HREF="/bugs.html">Bug Tracker</A><BR></td></tr></table></td></tr></table><BR> <table width=100% cellspacing=0 cellpadding=2 border=0><tr><td bgcolor="#000000"><table width=100% cellspacing=0 cellpadding=4 border=0><tr><td bgcolor="#AAAAEE" nowrap><B>Documentation</B></td></tr><tr><td bgcolor="#FFFFFF" nowrap><A HREF="/faq/">FAQ</A><br><A HREF="/tutorial/">Tutorial</A><BR><A HREF="/api/">API Reference</A><br><A HREF="/books.html">Published Books</A><BR></td></tr></table></td></tr></table><BR> <table width=100% cellspacing=0 cellpadding=2 border=0><tr><td bgcolor="#000000"><table width=100% cellspacing=0 cellpadding=4 border=0><tr><td bgcolor="#AAAAEE" nowrap><B>Projects</B></td></tr><tr><td bgcolor="#FFFFFF" nowrap><A HREF="http://www.pango.org/">Pango</A><BR><A HREF="http://sources.redhat.com/inti/">Inti</A><BR><A HREF="http://www.gnome.org/">GNOME</A><BR><A HREF="http://user.sgic.fi/~tml/gimp/win32/">GTK+ for Win32</A><br><A HREF="http://people.redhat.com/sopwith/gtkfb/">GtkFB (Framebuffer)</A><br><A HREF="http://www.directfb.org/gtk.xml">GTK+ on DirectFB</A><BR><A HREF="/beos/">GTK+ for BeOS</A></td></tr></table></td></tr></table><BR> <table width=100% cellspacing=0 cellpadding=2 border=0><tr><td bgcolor="#000000"><table width=100% cellspacing=0 cellpadding=4 border=0><tr><td bgcolor="#AAAAEE" nowrap><B><B>Applications</B></B></td></tr><tr><td bgcolor="#FFFFFF" nowrap><A HREF="http://www.gimp.org/">GIMP</A><BR><A HREF="http://www.abiword.org/">Abiword</A><BR><A HREF="http://www.lysator.liu.se/~alla/dia/dia.html">Dia</A><BR><A HREF="http://glade.pn.org/">Glade</A><BR><A HREF="http://www.gnucash.org/">GnuCash</A><BR><A HREF="http://www.gnome.org/projects/gnumeric/">Gnumeric</A><BR><BR><A HREF="http://www.gnome.org/applist/">GNOME Software Map</A><br></td></tr></table></td></tr></table><BR> </td> <td bgcolor="#ffffff" valign=top width="99%"><font face="lucida,helvetica"><BODYCLASS="SECT1"BGCOLOR="#FFFFFF"TEXT="#000000"LINK="#0000FF"VLINK="#840084"ALINK="#0000FF"><DIVCLASS="NAVHEADER"><TABLEWIDTH="100%"BORDER="0"CELLPADDING="0"CELLSPACING="0"><TR><THCOLSPAN="3"ALIGN="center">GTK+ 1.2 Tutorial</TH></TR><TR><TDWIDTH="10%"ALIGN="left"VALIGN="bottom"><AHREF="sec-keyandmousebindings.html"><<< Previous</A></TD><TDWIDTH="80%"ALIGN="center"VALIGN="bottom">Chapter 8. Range Widgets</TD><TDWIDTH="10%"ALIGN="right"VALIGN="bottom"><AHREF="ch-miscwidgets.html">Next >>></A></TD></TR></TABLE><HRALIGN="LEFT"WIDTH="100%"></DIV><DIVCLASS="SECT1"><H1CLASS="SECT1"><ANAME="SEC-RANGEWIDGETSEXAMPLE">8.5. Example</A></H1><P>This example is a somewhat modified version of the "range controls"test from <TTCLASS="LITERAL">testgtk.c</TT>. It basically puts up a window with threerange widgets all connected to the same adjustment, and a couple ofcontrols for adjusting some of the parameters mentioned above and inthe section on adjustments, so you can see how they affect the waythese widgets work for the user.</P><TABLEBORDER="0"BGCOLOR="#E0E0E0"WIDTH="100%"><TR><TD><PRECLASS="PROGRAMLISTING">/* example-start rangewidgets rangewidgets.c */#include <gtk/gtk.h>GtkWidget *hscale, *vscale;void cb_pos_menu_select( GtkWidget *item, GtkPositionType pos ){ /* Set the value position on both scale widgets */ gtk_scale_set_value_pos (GTK_SCALE (hscale), pos); gtk_scale_set_value_pos (GTK_SCALE (vscale), pos);}void cb_update_menu_select( GtkWidget *item, GtkUpdateType policy ){ /* Set the update policy for both scale widgets */ gtk_range_set_update_policy (GTK_RANGE (hscale), policy); gtk_range_set_update_policy (GTK_RANGE (vscale), policy);}void cb_digits_scale( GtkAdjustment *adj ){ /* Set the number of decimal places to which adj->value is rounded */ gtk_scale_set_digits (GTK_SCALE (hscale), (gint) adj->value); gtk_scale_set_digits (GTK_SCALE (vscale), (gint) adj->value);}void cb_page_size( GtkAdjustment *get, GtkAdjustment *set ){ /* Set the page size and page increment size of the sample * adjustment to the value specified by the "Page Size" scale */ set->page_size = get->value; set->page_increment = get->value; /* Now emit the "changed" signal to reconfigure all the widgets that * are attached to this adjustment */ gtk_signal_emit_by_name (GTK_OBJECT (set), "changed");}void cb_draw_value( GtkToggleButton *button ){ /* Turn the value display on the scale widgets off or on depending * on the state of the checkbutton */ gtk_scale_set_draw_value (GTK_SCALE (hscale), button->active); gtk_scale_set_draw_value (GTK_SCALE (vscale), button->active); }/* Convenience functions */GtkWidget *make_menu_item( gchar *name, GtkSignalFunc callback, gpointer data ){ GtkWidget *item; item = gtk_menu_item_new_with_label (name); gtk_signal_connect (GTK_OBJECT (item), "activate", callback, data); gtk_widget_show (item); return(item);}void scale_set_default_values( GtkScale *scale ){ gtk_range_set_update_policy (GTK_RANGE (scale), GTK_UPDATE_CONTINUOUS);⌨️ 快捷键说明
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