208 lines
5.5 KiB
XML
208 lines
5.5 KiB
XML
<sect1 id="Sme_Object">
|
|
<title>Sme Object</title>
|
|
<para>
|
|
<!-- .LP -->
|
|
<!-- .XS -->
|
|
<!-- Sme Object -->
|
|
<!-- .XE -->
|
|
<!-- .IN "Sme object" "" "@DEF@" -->
|
|
<!-- .sp -->
|
|
<literallayout class="monospaced">
|
|
<!-- .TA 2.0i -->
|
|
<!-- .ta 2.0i -->
|
|
Application Header file <X11/Xaw/Sme.h>
|
|
<!-- .IN "Sme.h" "" -->
|
|
Class Header file <X11/Xaw/SmeP.h>
|
|
<!-- .IN "SmeP.h" "" -->
|
|
Class smeObjectClass
|
|
<!-- .IN "smeObjectClass" "" -->
|
|
Class Name Sme
|
|
<!-- .IN "Sme object" "class name" -->
|
|
Superclass RectObj
|
|
</literallayout>
|
|
<!-- .sp -->
|
|
</para>
|
|
<para>
|
|
<!-- .LP -->
|
|
The Sme object is the base class for all menu entries. While this
|
|
object is mainly intended to be subclassed, it may be used in a menu to
|
|
add blank space between menu entries.
|
|
</para>
|
|
<sect2 id="sme_resources">
|
|
<title>Resources</title>
|
|
<!-- .IN "SmeLine object" "resources" -->
|
|
<para>
|
|
<!-- .LP -->
|
|
The resources associated with the SmeLine object are defined in this
|
|
section, and affect only the single menu entry specified by this object.
|
|
There are no new resources added for this class, as it picks up all its
|
|
resources from the RectObj class.
|
|
</para>
|
|
<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>ancestorSensitive</entry>
|
|
<entry>AncestorSensitive</entry>
|
|
<entry>Boolean</entry>
|
|
<entry></entry>
|
|
<entry>True</entry>
|
|
</row>
|
|
<row>
|
|
<entry>callback</entry>
|
|
<entry>Callback</entry>
|
|
<entry>XtCallbackList</entry>
|
|
<entry></entry>
|
|
<entry>NULL</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></entry>
|
|
<entry>0</entry>
|
|
</row>
|
|
<row>
|
|
<entry>international</entry>
|
|
<entry>International</entry>
|
|
<entry>Boolean</entry>
|
|
<entry>C</entry>
|
|
<entry>False</entry>
|
|
</row>
|
|
<row>
|
|
<entry>sensitive</entry>
|
|
<entry>Sensitive</entry>
|
|
<entry>Boolean</entry>
|
|
<entry></entry>
|
|
<entry>True</entry>
|
|
</row>
|
|
<row>
|
|
<entry>width</entry>
|
|
<entry>Width</entry>
|
|
<entry>Dimension</entry>
|
|
<entry></entry>
|
|
<entry>1</entry>
|
|
</row>
|
|
</tbody>
|
|
</tgroup>
|
|
</informaltable>
|
|
<!-- .As -->
|
|
<!-- .Dc -->
|
|
<!-- .Hw -->
|
|
|
|
<para>
|
|
Keep in mind that the SimpleMenu widget will force all menu items to
|
|
be the width of the widest entry.
|
|
<!-- .Ix Bold -->
|
|
<!-- .Se -->
|
|
</para>
|
|
</sect2>
|
|
<sect2 id="Subclassing_the_Sme_Object">
|
|
<title>Subclassing the Sme Object</title>
|
|
<!-- .IN "Sme object" "subclassing" "@DEF" -->
|
|
<para>
|
|
<!-- .LP -->
|
|
<!-- .sp -->
|
|
To Create a new Sme object <emphasis remap='I'>class</emphasis> you will need to define three class methods.
|
|
These methods allow the SimpleMenu to highlight and unhighlight the
|
|
menu entry as the pointer cursor moves over it, as well as notify the
|
|
entry when the user has selected it. All of
|
|
these methods may be inherited from the Sme object, although the default
|
|
semantics are not very interesting.
|
|
</para>
|
|
<para>
|
|
<variablelist>
|
|
<varlistentry>
|
|
<term>
|
|
<function>Highlight</function>(\|)
|
|
</term>
|
|
<listitem>
|
|
<para>
|
|
<!-- .IN "Sme object" "Highlight method" -->
|
|
Called to put the menu entry into the highlighted state.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term>
|
|
<function>Unhighlight</function>(\|)
|
|
</term>
|
|
<listitem>
|
|
<para>
|
|
<!-- .IN "Sme object" "Unhighlight method" -->
|
|
Called to return the widget to its normal (unhighlighted) state.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term>
|
|
<function>Notify</function>(\|)
|
|
</term>
|
|
<listitem>
|
|
<para>
|
|
<!-- .IN "Sme object" "Notify method" -->
|
|
Called when the user selects this menu entry.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
</variablelist>
|
|
</para>
|
|
<para>
|
|
<!-- .LP -->
|
|
<!-- .sp -->
|
|
Other then these methods, creating a new object
|
|
is straight forward. Here is some information that may help you
|
|
avoid some common mistakes.
|
|
</para>
|
|
<orderedlist>
|
|
<listitem><para>Objects can be zero pixels high.</para></listitem>
|
|
<listitem>
|
|
<para>
|
|
Objects draw on their parent's window, therefore the Drawing dimensions
|
|
are different from those of widgets. For instance, y locations vary
|
|
from <function>y</function> to <function>y + height</function>, not <function>0</function> to <function>height</function>.
|
|
</para>
|
|
</listitem>
|
|
<listitem>
|
|
<para>
|
|
<!-- .IP 3) 3n -->
|
|
XtSetValues calls may come from the application while the Sme is highlighted,
|
|
and if the SetValues method returns True, will result in an expose event.
|
|
The SimpleMenu may later call the menu entry's <function>unhighlight</function>
|
|
procedure. However, due to the asynchronous nature of
|
|
X, the expose event generated by <function>XtSetValues</function> will come <emphasis remap='I'>after</emphasis>
|
|
this unhighlight.
|
|
</para>
|
|
</listitem>
|
|
<listitem>
|
|
<para>
|
|
Remember that your subclass of the Sme does not own the
|
|
window. Share the space with other menu entries, and refrain
|
|
from drawing outside the subclass's own section of the menu.
|
|
</para>
|
|
</listitem>
|
|
</orderedlist>
|
|
</sect2>
|
|
</sect1>
|