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<H2><A NAME="sec:1.5"><SPAN class="sec-nr">1.5</SPAN> <SPAN class="sec-title">Look-and-feel</SPAN></A></H2>

<P><A NAME="idx:lookandfeel:10"></A><A NAME="idx:Motif:11"></A><A NAME="idx:OpenWindows:12"></A><A NAME="idx:MSWindows:13"></A><font size=-1>XPCE</font> 
is not implemented on top of a standard UI library such as Motif, 
OpenWindows, or Win32. Instead, it is built on top of its own VWS 
defining primitives to create and manipulate windows, draw primitives 
such as lines, circles, text and handle user-events.

<P>As a consequence, <font size=-1>XPCE</font> programs are fully 
compatible over the available platforms, except that some (almost 
exclusively obscure) features may have a different or have no effect on 
some implementations.

<P>The implementation of all of <font size=-1>XPCE</font> on top of its 
primitive graphicals guarantees there are no platform-specific 
limitations in the manipulation and semantics of certain controllers. <font size=-1>XPCE</font> 
defines the look-and-feel for each of the controllers. As a consequence,
<font size=-1>XPCE</font> controllers may not behave exactly the same as 
controllers of other applications in the same windowing environment.

<P>All good things come at a price-tag and portability based on a 
virtual environment is no exception to this rule. <font size=-1>XPCE</font> 
builds high-level controllers (called dialog-items in its jargon) on top 
of the virtual machine and therefore bypasses the graphical libraries of 
the hosting system. The same technique is used by many other portable 
GUI toolkits, among which Java.

<P>The visual feedback (look) and to some extend the reactions to user 
actions (feel) of the <font size=-1>XPCE</font> controllers is 
determined by
<font size=-1>XPCE</font>'s <EM>defaults</EM> file, located in
<CODE>&lt;<VAR>pcehome</VAR>&gt;/Defaults</CODE>. See <A class="sec" href="classvar.html">section 
8</A>.

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