File: Porthole.xml

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<sect1 id="Porthole_Widget">
<title>Porthole Widget</title>
<para>
<!-- .LP -->
<!-- .XS -->
<!-- 	Porthole Widget -->
<!-- .XE -->
<!-- .IN "Porthole widget" "" "@DEF@" -->
<literallayout class="monospaced">
<!-- .TA 2.0i -->
<!-- .ta 2.0i -->
<!-- .sp -->
Application Header file	&lt;X11/Xaw/Porthole.h&gt;
<!-- .IN "Porthole.h" "" -->
Class Header file	&lt;X11/Xaw/PortholeP.h&gt;
<!-- .IN "PortholeP.h" "" -->
Class		portholeWidgetClass
<!-- .IN "portholeWidgetClass" "" -->
Class Name	Porthole
<!-- .IN "Porthole widget" "class name" -->
Superclass	Composite
<!-- .sp -->
</literallayout>
</para>
<para>
<!-- .LP -->
The Porthole widget provides geometry management of a list of arbitrary
widgets, only one of which may be managed at any particular time.
The managed child widget is reparented within the porthole and is moved around
by the application (typically under the control of a Panner widget).
</para>
<sect2 id='Porthole::Resources'>
<title>Resources</title>
<para>
<!-- .LP -->
When creating a Porthole widget instance, the following resources are
retrieved from the argument list or from the resource database:
</para>
<para>
<!-- .LP -->
<!-- .IN "Porthole widget" "resources" -->
<informaltable>
  <tgroup cols='5' align='center'>
  <colspec colname='c1'/>
  <colspec colname='c2'/>
  <colspec colname='c3'/>
  <colspec colname='c4'/>
  <colspec colname='c5'/>
  <thead>
    <row>
      <entry>Name</entry>
      <entry>Class</entry>
      <entry>Type</entry>
      <entry>Notes</entry>
      <entry>Default Value</entry>
    </row>
  </thead>
  <tbody>
    <row>
      <entry>accelerators</entry>
      <entry>Accelerators</entry>
      <entry>AcceleratorTable</entry>
      <entry></entry>
      <entry>NULL</entry>
    </row>
    <row>
      <entry>ancestorSensitive</entry>
      <entry>AncestorSensitive</entry>
      <entry>Boolean</entry>
      <entry>D</entry>
      <entry>True</entry>
    </row>
    <row>
      <entry>background</entry>
      <entry>Background</entry>
      <entry>Pixel</entry>
      <entry></entry>
      <entry>XtDefaultBackground</entry>
    </row>
    <row>
      <entry>backgroundPixmap</entry>
      <entry>Pixmap</entry>
      <entry>Pixmap</entry>
      <entry></entry>
      <entry>XtUnspecifiedPixmap</entry>
    </row>
    <row>
      <entry>borderColor</entry>
      <entry>BorderColor</entry>
      <entry>Pixel</entry>
      <entry></entry>
      <entry>XtDefaultForeground</entry>
    </row>
    <row>
      <entry>borderPixmap</entry>
      <entry>Pixmap</entry>
      <entry>Pixmap</entry>
      <entry></entry>
      <entry>XtUnspecifiedPixmap</entry>
    </row>
    <row>
      <entry>borderWidth</entry>
      <entry>BorderWidth</entry>
      <entry>Dimension</entry>
      <entry></entry>
      <entry>1</entry>
    </row>
    <row>
      <entry>children</entry>
      <entry>ReadOnly</entry>
      <entry>WidgetList</entry>
      <entry>R</entry>
      <entry>NULL</entry>
    </row>
    <row>
      <entry>colormap</entry>
      <entry>Colormap</entry>
      <entry>Colormap</entry>
      <entry></entry>
      <entry>Parent's Colormap</entry>
    </row>
    <row>
      <entry>depth</entry>
      <entry>Depth</entry>
      <entry>int</entry>
      <entry>C</entry>
      <entry>Parent's Depth</entry>
    </row>
    <row>
      <entry>destroyCallback</entry>
      <entry>Callback</entry>
      <entry>XtCallbackList</entry>
      <entry></entry>
      <entry>NULL</entry>
    </row>
    <row>
      <entry>height</entry>
      <entry>Height</entry>
      <entry>Dimension</entry>
      <entry>A</entry>
      <entry>see <function>Layout Semantics</function></entry>
    </row>
    <row>
      <entry>mappedWhenManaged</entry>
      <entry>MappedWhenManaged</entry>
      <entry>Boolean</entry>
      <entry></entry>
      <entry>True</entry>
    </row>
    <row>
      <entry>numChildren</entry>
      <entry>ReadOnly</entry>
      <entry>Cardinal</entry>
      <entry>R</entry>
      <entry>0</entry>
    </row>
    <row>
      <entry>reportCallback</entry>
      <entry>ReportCallback</entry>
      <entry>Callback</entry>
      <entry></entry>
      <entry>NULL</entry>
    </row>
    <row>
      <entry>screen</entry>
      <entry>Screen</entry>
      <entry>Screen</entry>
      <entry>R</entry>
      <entry>Parent's Screen</entry>
    </row>
    <row>
      <entry>sensitive</entry>
      <entry>Sensitive</entry>
      <entry>Boolean</entry>
      <entry></entry>
      <entry>True</entry>
    </row>
    <row>
      <entry>translations</entry>
      <entry>Translations</entry>
      <entry>TranslationTable</entry>
      <entry></entry>
      <entry>NULL</entry>
    </row>
    <row>
      <entry>width</entry>
      <entry>Width</entry>
      <entry>Dimension</entry>
      <entry>A</entry>
      <entry>see <function>Layout Semantics</function></entry>
    </row>
    <row>
      <entry>x</entry>
      <entry>Position</entry>
      <entry>Position</entry>
      <entry></entry>
      <entry>0</entry>
    </row>
    <row>
      <entry>y</entry>
      <entry>Position</entry>
      <entry>Position</entry>
      <entry></entry>
      <entry>0</entry>
    </row>
    <row>
      <entry>_</entry>
    </row>
  </tbody>
  </tgroup>
</informaltable>
<!-- .Ac -->
<!-- .As -->
<!-- .Bg -->
<!-- .Gp -->
<!-- .Bc -->
<!-- .Bp -->
<!-- .Bw -->
<!-- .Ch -->
<!-- .Cm -->
<!-- .Dp -->
<!-- .Dc -->
<!-- .Hw -->
<!-- .Mm -->
<!-- .Nc -->
<variablelist>
  <varlistentry>
    <term>
      <function>reportCallback</function>
    </term>
    <listitem>
      <para>
A list of functions to invoke whenever the managed child widget changes
size or position.
      </para>
    </listitem>
  </varlistentry>
</variablelist>
<!-- .Sc -->
<!-- .Se -->
<!-- .Tr -->
<!-- .Xy -->
</para>
</sect2>
<sect2 id='Porthole::Layout_Semantics'>
<title>Layout Semantics</title>
<!-- .IN "Porthole widget" "layout semantics" -->
<para>
<!-- .LP -->
The Porthole widget allows its managed child to request any size
that is as large
or larger than the Porthole itself and any location so long as the child
still obscures all of the Porthole.  This widget typically is used with a
Panner widget.
</para>
</sect2>
<sect2 id="Porthole_Callbacks">
<title>Porthole Callbacks</title>
<!-- .IN "Porthole widget" "callbacks" -->
<para>
<!-- .LP -->
The functions registered on the <function>reportCallback</function> list are invoked whenever
the managed child changes size or position:
<!-- .IN "ReportProc" "" "@DEF@" -->
<funcsynopsis id='Porthole::ReportProc'>
<funcprototype>
  <funcdef>void<function> ReportProc</function></funcdef>
  <paramdef>Widget<parameter> porthole</parameter></paramdef>
  <paramdef>XtPointer<parameter> client_data</parameter></paramdef>
  <paramdef>XtPointer<parameter> report</parameter></paramdef>
</funcprototype>
</funcsynopsis>
<!-- .FN -->
</para>
<variablelist>
  <varlistentry>
    <term>porthole</term>
    <listitem>
      <para>
<!-- .IP <emphasis remap='I'>porthole</emphasis> 1i -->
Specifies the Porthole widget.
      </para>
    </listitem>
  </varlistentry>
  <varlistentry>
    <term>client_data</term>
    <listitem>
      <para>
<!-- .IP <emphasis remap='I'>client_data</emphasis> 1i -->
Specifies the client data.
      </para>
    </listitem>
  </varlistentry>
  <varlistentry>
    <term>report</term>
    <listitem>
      <para>
<!-- .IP <emphasis remap='I'>report</emphasis> 1i -->
Specifies a pointer to an <function>XawPannerReport</function> structure containing
the location and size of the slider and the size of the canvas.
      </para>
    </listitem>
  </varlistentry>
</variablelist>
</sect2>
</sect1>