/usr/share/doc/libxaw7-dev/Sme.xml is in libxaw-doc 2:1.0.13-1.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 | <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 <xref linkend='XtSetValues' xrefstyle='select: title'/> 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>
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