xref: /xsrc/external/mit/libXaw/dist/specs/MenuButton.xml

<sect1 id="MenuButton_Widget">
<title>MenuButton Widget</title>
<!-- .XS -->
<!-- 	MenuButton Widget -->
<!-- .XE -->
<indexterm significance="preferred"><primary>MenuButton widget</primary></indexterm>
<!-- .sp -->
<literallayout class="monospaced">
<!-- .TA 2.0i -->
<!-- .ta 2.0i -->
Application Header file	&lt;X11/Xaw/MenuButton.h&gt;
<indexterm><primary>MenuButton.h</primary></indexterm>
Class Header file	&lt;X11/Xaw/MenuButtonP.h&gt;
<indexterm><primary>MenuButtonP.h</primary></indexterm>
Class		menuButtonWidgetClass
<indexterm><primary>menuButtonWidgetClass</primary></indexterm>
Class Name	MenuButton
<indexterm><primary>MenuButton widget</primary><secondary>class name</secondary></indexterm>
Superclass	Command
</literallayout>
<para>
<!-- .LP -->
<!-- .sp -->
The MenuButton widget is an area, often rectangular,
that displays a graphic.  The graphic may be a text
string containing multiple lines of characters in an 8
bit or 16 bit character set (to be displayed with a
<emphasis remap='I'>font</emphasis>), or in a multi-byte encoding (for use with
a <emphasis remap='I'>fontset</emphasis>).  The graphic may also be a bitmap or
pixmap.
</para>
<para>
<!-- .LP -->
When the pointer cursor is on a MenuButton widget, the
MenuButton becomes highlighted by drawing a rectangle
around its perimeter.  This highlighting indicates
that the MenuButton is ready for selection.  When a
pointer button is pressed, the MenuButton widget will
pop up the menu named in the <function>menuName</function> resource.
</para>
<sect2 id="MenuButton::Resources">
<title>Resources</title>
<para>
<!-- .LP -->
When creating a MenuButton widget instance,
the following resources are retrieved from the argument list
or from the resource database:
</para>
<para>
<!-- .LP -->
<indexterm><primary>MenuButton widget</primary><secondary>resources</secondary></indexterm>
<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>bitmap</entry>
      <entry>Bitmap</entry>
      <entry>Pixmap</entry>
      <entry></entry>
      <entry>None</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>callback</entry>
      <entry>Callback</entry>
      <entry>XtCallbackList</entry>
      <entry></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>cornerRoundPercent</entry>
      <entry>CornerRoundPercent</entry>
      <entry>Dimension</entry>
      <entry></entry>
      <entry>25</entry>
    </row>
    <row>
      <entry>cursor</entry>
      <entry>Cursor</entry>
      <entry>Cursor</entry>
      <entry></entry>
      <entry>None</entry>
    </row>
    <row>
      <entry>cursorName</entry>
      <entry>Cursor</entry>
      <entry>String</entry>
      <entry></entry>
      <entry>None</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>encoding</entry>
      <entry>Encoding</entry>
      <entry>UnsignedChar</entry>
      <entry></entry>
      <entry>XawTextEncoding8bit</entry>
    </row>
    <row>
      <entry>font</entry>
      <entry>Font</entry>
      <entry>XFontStruct</entry>
      <entry></entry>
      <entry>XtDefaultFont</entry>
    </row>
    <row>
      <entry>fontSet</entry>
      <entry>FontSet</entry>
      <entry>XFontSet</entry>
      <entry></entry>
      <entry>XtDefaultFontSet</entry>
    </row>
    <row>
      <entry>foreground</entry>
      <entry>Foreground</entry>
      <entry>Pixel</entry>
      <entry></entry>
      <entry>XtDefaultForeground</entry>
    </row>
    <row>
      <entry>height</entry>
      <entry>Height</entry>
      <entry>Dimension</entry>
      <entry>A</entry>
      <entry>graphic height + 2 * <function>internalHeight</function></entry>
    </row>
    <row>
      <entry>highlightThickness</entry>
      <entry>Thickness</entry>
      <entry>Dimension</entry>
      <entry>A</entry>
      <entry>2 (0 if Shaped)</entry>
    </row>
    <row>
      <entry>insensitiveBorder</entry>
      <entry>Insensitive</entry>
      <entry>Pixmap</entry>
      <entry></entry>
      <entry>GreyPixmap</entry>
    </row>
    <row>
      <entry>internalHeight</entry>
      <entry>Height</entry>
      <entry>Dimension</entry>
      <entry></entry>
      <entry>2</entry>
    </row>
    <row>
      <entry>internalWidth</entry>
      <entry>Width</entry>
      <entry>Dimension</entry>
      <entry></entry>
      <entry>4</entry>
    </row>
    <row>
      <entry>international</entry>
      <entry>International</entry>
      <entry>Boolean</entry>
      <entry>C</entry>
      <entry>False</entry>
    </row>
    <row>
      <entry>justify</entry>
      <entry>Justify</entry>
      <entry>Justify</entry>
      <entry></entry>
      <entry>XtJustifyCenter (center)</entry>
    </row>
    <row>
      <entry>label</entry>
      <entry>Label</entry>
      <entry>String</entry>
      <entry></entry>
      <entry>name of widget</entry>
    </row>
    <row>
      <entry>leftBitmap</entry>
      <entry>LeftBitmap</entry>
      <entry>Bitmap</entry>
      <entry></entry>
      <entry>None</entry>
    </row>
    <row>
      <entry>mappedWhenManaged</entry>
      <entry>MappedWhenManaged</entry>
      <entry>Boolean</entry>
      <entry></entry>
      <entry>True</entry>
    </row>
    <row>
      <entry>menuName</entry>
      <entry>MenuName</entry>
      <entry>String</entry>
      <entry></entry>
      <entry>"menu"</entry>
    </row>
    <row>
      <entry>pointerColor</entry>
      <entry>Foreground</entry>
      <entry>Pixel</entry>
      <entry></entry>
      <entry>XtDefaultForeground</entry>
    </row>
    <row>
      <entry>pointerColorBackground</entry>
      <entry>Background</entry>
      <entry>Pixel</entry>
      <entry></entry>
      <entry>XtDefaultBackground</entry>
    </row>
    <row>
      <entry>resize</entry>
      <entry>Resize</entry>
      <entry>Boolean</entry>
      <entry></entry>
      <entry>True</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>shapeStype</entry>
      <entry>ShapeStyle</entry>
      <entry>ShapeStyle</entry>
      <entry></entry>
      <entry>Rectangle</entry>
    </row>
    <row>
      <entry>translations</entry>
      <entry>Translations</entry>
      <entry>TranslationTable</entry>
      <entry></entry>
      <entry>See below</entry>
    </row>
    <row>
      <entry>width</entry>
      <entry>Width</entry>
      <entry>Dimension</entry>
      <entry>A</entry>
      <entry>graphic width + 2 * <function>internalWidth</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 -->
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<!-- .Bm -->
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<!-- .Bp -->
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<!-- .Cm -->
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<!-- .Cn -->
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<!-- .Ib -->
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<!-- .In -->
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<!-- .Mm -->
<variablelist>
  <varlistentry>
    <term>
      <function>menuName</function>
    </term>
    <listitem>
      <para>
The name of a popup shell to popup as a menu.  The MenuButton
will search for this name using <function>XtNameToWidget</function> starting
with itself as the reference widget.  If the search is
unsuccessful the widget will continue up the widget tree using
each of its ancestors as the reference widget passed to
<function>XtNameToWidget</function>.  If no widget of called <function>menuName</function> is
found by this algorithm, the widget will print a warning message
and give up.  When the menu is found it will be popped up
exclusive and spring_loaded.  The MenuButton widget does not
copy the value of this resource into newly allocated memory. The
application programmer must pass the resource value in
nonvolatile memory.
<!-- .Pf -->
<!-- .Pb -->
<!-- .Re -->
<!-- .Sc -->
<!-- .Se -->
<!-- .Ss -->
<!-- .Tr -->
<!-- .Xy -->
    </para>
  </listitem>
  </varlistentry>
</variablelist>
</para>
</sect2>
<sect2 id="MenuButton_Actions">
<title>MenuButton Actions</title>
<indexterm><primary>MenuButton widget</primary><secondary>actions</secondary></indexterm>
<para>
<!-- .LP -->
The MenuButton widget supports the following actions:
</para>
<itemizedlist>
  <listitem>
    <para>
Switching the button between the foreground and background
colors with <function>set</function> and <function>unset</function>
    </para>
  </listitem>
  <listitem>
    <para>
Processing application callbacks with <function>notify</function>
    </para>
  </listitem>
  <listitem>
    <para>
Switching the internal border between highlighted
and unhighlighted states with <function>highlight</function> and <function>unhighlight</function>
    </para>
  </listitem>
  <listitem>
    <para>
Popping up a menu with <function>PopupMenu</function>
    </para>
  </listitem>
</itemizedlist>
<para>
<!-- .LP -->
The following are the default translation bindings used by the
MenuButton widget:
</para>
<para>
<!-- .LP -->
<!-- .sp -->
<literallayout class="monospaced">
<!-- .TA .5i 2.25i -->
<!-- .ta .5i 2.25i -->
	&lt;EnterWindow&gt;:	highlight(&#x2006;)
	&lt;LeaveWindow&gt;:	reset(&#x2006;)
	&lt;BtnDown&gt;:	reset(&#x2006;) PopupMenu(\)
</literallayout>
</para>
</sect2>
<sect2 id='MenuButton_Actions_b'>
<title>MenuButton Actions</title>
<para>
<!-- .LP -->
The full list of actions supported by MenuButton is:
<variablelist>
  <varlistentry>
    <term>
      <function>highlight</function>(<function>condition</function>)
    </term>
    <listitem>
      <para>
Displays the internal highlight border in the color (<function>foreground</function>
or <function>background</function> ) that contrasts with the interior color of the
Command widget.  The conditions <function>WhenUnset</function> and <function>Always</function> are
understood by this action procedure.  If no argument is passed,
<function>WhenUnset</function> is assumed.
      </para>
    </listitem>
  </varlistentry>
  <varlistentry>
    <term>
      <function>unhighlight</function>(&#x2006;)
    </term>
    <listitem>
      <para>
Displays the internal highlight border in the color (<function>XtNforeground</function>
or <function>background</function> ) that matches the interior color of the
MenuButton widget.
      </para>
    </listitem>
  </varlistentry>
  <varlistentry>
    <term>
      <function>set</function>(&#x2006;)
    </term>
    <listitem>
      <para>
Enters the <function>set</function> state, in which <function>notify</function> is possible.  This
action causes the button to display its interior in the
<function>foreground</function> color.  The label or bitmap is displayed in the
<function>background</function> color.
      </para>
    </listitem>
  </varlistentry>
  <varlistentry>
    <term>
      <function>unset</function>(&#x2006;)
    </term>
    <listitem>
      <para>
Cancels the <emphasis remap='I'>set</emphasis> state and displays the interior of the button in the
<function>background</function> color.  The label or bitmap is displayed in the
<function>foreground</function> color.
      </para>
    </listitem>
  </varlistentry>
  <varlistentry>
    <term>
      <function>reset</function>(&#x2006;)
    </term>
    <listitem>
      <para>
Cancels any <function>set</function> or <function>highlight</function> and displays the interior of the
button in the <function>background</function> color, with the label displayed in the
<function>foreground</function> color.
      </para>
    </listitem>
  </varlistentry>
  <varlistentry>
    <term>
      <function>notify</function>(&#x2006;)
    </term>
    <listitem>
      <para>
When the button is in the <function>set</function> state this action calls all functions in
the callback list named by the <function>callback</function> resource.  The value of
the call_data argument in these callback functions is undefined.
      </para>
    </listitem>
  </varlistentry>
  <varlistentry>
    <term>
      <function>PopupMenu</function>(&#x2006;)
    </term>
    <listitem>
      <para>
Pops up the menu specified by the <function>menuName</function> resource.
    </para>
  </listitem>
  </varlistentry>
</variablelist>
</para>
<para>
<!-- .LP -->
The MenuButton widget does not place a server grab on itself.
Instead, PopupMenu is registered as a grab action.
As a result, clients which popup menus without using XtMenuPopup
or MenuPopup or PopupMenu in translations will fail to have a grab active.
They should make a call to XtRegisterGrabAction on the appropriate action
in the application initialization routine, or use a different translation.
<!-- .bp -->

</para>
</sect2>
</sect1>