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<HTML><HEAD><TITLE>Using Adjustments the Easy Way</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="Adjustments"HREF="ch-adjustments.html"><LINKREL="PREVIOUS"TITLE="Adjustments"HREF="ch-adjustments.html"><LINKREL="NEXT"TITLE="Adjustment Internals"HREF="sec-adjustmentinternals.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="ch-adjustments.html"><<< Previous</A></TD><TDWIDTH="80%"ALIGN="center"VALIGN="bottom">Chapter 7. Adjustments</TD><TDWIDTH="10%"ALIGN="right"VALIGN="bottom"><AHREF="sec-adjustmentinternals.html">Next >>></A></TD></TR></TABLE><HRALIGN="LEFT"WIDTH="100%"></DIV><DIVCLASS="SECT1"><H1CLASS="SECT1"><ANAME="SEC-USINGADJUSTMENTS">7.2. Using Adjustments the Easy Way</A></H1><P>The adjustable widgets can be roughly divided into those which use andrequire specific units for these values and those which treat them asarbitrary numbers. The group which treats the values as arbitrarynumbers includes the range widgets (scrollbars and scales, theprogress bar widget, and the spin button widget). These widgets areall the widgets which are typically "adjusted" directly by the userwith the mouse or keyboard. They will treat the <TTCLASS="LITERAL">lower</TT> and<TTCLASS="LITERAL">upper</TT> values of an adjustment as a range within which the usercan manipulate the adjustment's <TTCLASS="LITERAL">value</TT>. By default, they will onlymodify the <TTCLASS="LITERAL">value</TT> of an adjustment.</P><P>The other group includes the text widget, the viewport widget, thecompound list widget, and the scrolled window widget. All of thesewidgets use pixel values for their adjustments. These are also allwidgets which are typically "adjusted" indirectly using scrollbars.While all widgets which use adjustments can either create their ownadjustments or use ones you supply, you'll generally want to let thisparticular category of widgets create its own adjustments. Usually,they will eventually override all the values except the <TTCLASS="LITERAL">value</TT>itself in whatever adjustments you give them, but the results are, ingeneral, undefined (meaning, you'll have to read the source code tofind out, and it may be different from widget to widget).</P><P>Now, you're probably thinking, since text widgets and viewports insiston setting everything except the <TTCLASS="LITERAL">value</TT> of their adjustments,while scrollbars will <ICLASS="EMPHASIS">only</I> touch the adjustment's <TTCLASS="LITERAL">value</TT>, ifyou <ICLASS="EMPHASIS">share</I> an adjustment object between a scrollbar and a textwidget, manipulating the scrollbar will automagically adjust the textwidget? Of course it will! Just like this:</P><TABLEBORDER="0"BGCOLOR="#E0E0E0"WIDTH="100%"><TR><TD><PRECLASS="PROGRAMLISTING"> /* creates its own adjustments */ text = gtk_text_new (NULL, NULL); /* uses the newly-created adjustment for the scrollbar as well */ vscrollbar = gtk_vscrollbar_new (GTK_TEXT(text)->vadj);</PRE></TD></TR></TABLE></DIV><DIVCLASS="NAVFOOTER"><HRALIGN="LEFT"WIDTH="100%"><TABLEWIDTH="100%"BORDER="0"CELLPADDING="0"CELLSPACING="0"><TR><TDWIDTH="33%"ALIGN="left"VALIGN="top"><AHREF="ch-adjustments.html"><<< Previous</A></TD><TDWIDTH="34%"ALIGN="center"VALIGN="top"><AHREF="gtk-tut.html">Home</A></TD><TDWIDTH="33%"ALIGN="right"VALIGN="top"><AHREF="sec-adjustmentinternals.html">Next >>></A></TD></TR><TR><TDWIDTH="33%"ALIGN="left"VALIGN="top">Adjustments</TD><TDWIDTH="34%"ALIGN="center"VALIGN="top"><AHREF="ch-adjustments.html">Up</A></TD><TDWIDTH="33%"ALIGN="right"VALIGN="top">Adjustment Internals</TD></TR></TABLE></DIV> </td> </tr></table> </td> </tr></table></body></BODY></HTML>⌨️ 快捷键说明
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