873 lines
22 KiB
XML
873 lines
22 KiB
XML
<sect1 id="List_Widget">
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<title>List Widget</title>
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<para>
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<!-- .LP -->
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<!-- .XS -->
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<!-- List Widget -->
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<!-- .XE -->
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<!-- .IN "List widget" "" "@DEF@" -->
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<literallayout class="monospaced">
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<!-- .TA 2.0i -->
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<!-- .ta 2.0i -->
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<!-- .sp -->
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Application header file <X11/Xaw/List.h>
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<!-- .IN "List.h" "" -->
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Class header file <X11/Xaw/ListP.h>
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<!-- .IN "ListP.h" "" -->
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Class listWidgetClass
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<!-- .IN "listWidgetClass" "" -->
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Class Name List
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<!-- .IN "List widget" "class name" -->
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Superclass Simple
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<!-- .sp -->
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</literallayout>
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</para>
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<para>
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<!-- .LP -->
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The List widget contains a list of strings formatted into rows and
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columns. When one of the strings is selected, it is highlighted, and the
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List widget's <function>Notify</function> action is invoked, calling all routines on
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its callback list. Only one string may be selected at a time.
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</para>
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<sect2 id='List::Resources'>
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<title>Resources</title>
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<para>
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<!-- .LP -->
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When creating a List widget instance, the following resources are
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retrieved from the argument list or from the resource database:
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</para>
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<para>
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<!-- .LP -->
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<!-- .IN "List widget" "resources" -->
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<informaltable>
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<tgroup cols='5' align='center'>
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<colspec colname='c1'/>
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<colspec colname='c2'/>
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<colspec colname='c3'/>
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<colspec colname='c4'/>
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<colspec colname='c5'/>
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<thead>
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<row>
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<entry>Name</entry>
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<entry>Class</entry>
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<entry>Type</entry>
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<entry>Notes</entry>
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<entry>Default Value</entry>
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</row>
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</thead>
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<tbody>
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<row>
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<entry>accelerators</entry>
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<entry>Accelerators</entry>
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<entry>AcceleratorTable</entry>
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<entry></entry>
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<entry>NULL</entry>
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</row>
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<row>
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<entry>ancestorSensitive</entry>
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<entry>AncestorSensitive</entry>
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<entry>Boolean</entry>
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<entry>D</entry>
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<entry>True</entry>
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</row>
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<row>
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<entry>background</entry>
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<entry>Background</entry>
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<entry>Pixel</entry>
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<entry></entry>
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<entry>XtDefaultBackground</entry>
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</row>
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<row>
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<entry>backgroundPixmap</entry>
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<entry>Pixmap</entry>
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<entry>Pixmap</entry>
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<entry></entry>
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<entry>XtUnspecifiedPixmap</entry>
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</row>
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<row>
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<entry>borderColor</entry>
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<entry>BorderColor</entry>
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<entry>Pixel</entry>
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<entry></entry>
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<entry>XtDefaultForeground</entry>
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</row>
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<row>
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<entry>borderPixmap</entry>
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<entry>Pixmap</entry>
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<entry>Pixmap</entry>
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<entry></entry>
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<entry>XtUnspecifiedPixmap</entry>
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</row>
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<row>
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<entry>borderWidth</entry>
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<entry>BorderWidth</entry>
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<entry>Dimension</entry>
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<entry></entry>
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<entry>1</entry>
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</row>
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<row>
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<entry>callback</entry>
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<entry>Callback</entry>
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<entry>Callback</entry>
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<entry></entry>
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<entry>NULL</entry>
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</row>
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<row>
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<entry>colormap</entry>
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<entry>Colormap</entry>
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<entry>Colormap</entry>
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<entry></entry>
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<entry>Parent's Colormap</entry>
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</row>
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<row>
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<entry>columnSpacing</entry>
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<entry>Spacing</entry>
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<entry>Dimension</entry>
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<entry></entry>
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<entry>6</entry>
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</row>
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<row>
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<entry>cursor</entry>
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<entry>Cursor</entry>
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<entry>Cursor</entry>
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<entry></entry>
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<entry>XC_left_ptr</entry>
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</row>
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<row>
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<entry>cursorName</entry>
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<entry>Cursor</entry>
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<entry>String</entry>
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<entry></entry>
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<entry>NULL</entry>
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</row>
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<row>
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<entry>defaultColumns</entry>
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<entry>Columns</entry>
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<entry>int</entry>
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<entry></entry>
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<entry>2</entry>
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</row>
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<row>
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<entry>depth</entry>
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<entry>Depth</entry>
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<entry>int</entry>
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<entry>C</entry>
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<entry>Parent's Depth</entry>
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</row>
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<row>
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<entry>destroyCallback</entry>
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<entry>Callback</entry>
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<entry>XtCallbackList</entry>
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<entry></entry>
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<entry>NULL</entry>
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</row>
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<row>
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<entry>font</entry>
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<entry>Font</entry>
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<entry>FontStruct</entry>
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<entry></entry>
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<entry>XtDefaultFont</entry>
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</row>
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<row>
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<entry>fontSet</entry>
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<entry>FontSet</entry>
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<entry>XFontSet</entry>
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<entry></entry>
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<entry>XtDefaultFontSet</entry>
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</row>
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<row>
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<entry>forceColumns</entry>
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<entry>Columns</entry>
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<entry>Boolean</entry>
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<entry></entry>
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<entry>False</entry>
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</row>
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<row>
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<entry>foreground</entry>
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<entry>Foreground</entry>
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<entry>Pixel</entry>
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<entry></entry>
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<entry>XtDefaultForeground</entry>
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</row>
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<row>
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<entry>height</entry>
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<entry>Height</entry>
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<entry>Dimension</entry>
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<entry>A</entry>
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<entry>Enough space to contain the list</entry>
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</row>
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<row>
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<entry>insensitiveBorder</entry>
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<entry>Insensitive</entry>
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<entry>Pixmap</entry>
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<entry></entry>
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<entry>GreyPixmap</entry>
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</row>
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<row>
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<entry>internalHeight</entry>
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<entry>Height</entry>
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<entry>Dimension</entry>
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<entry></entry>
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<entry>2</entry>
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</row>
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<row>
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<entry>internalWidth</entry>
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<entry>Width</entry>
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<entry>Dimension</entry>
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<entry></entry>
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<entry>4</entry>
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</row>
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<row>
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<entry>international</entry>
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<entry>International</entry>
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<entry>Boolean</entry>
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<entry>C</entry>
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<entry>False</entry>
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</row>
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<row>
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<entry>list</entry>
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<entry>List</entry>
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<entry>Pointer</entry>
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<entry></entry>
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<entry>name of widget</entry>
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</row>
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<row>
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<entry>longest</entry>
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<entry>Longest</entry>
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<entry>int</entry>
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<entry>A</entry>
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<entry>0</entry>
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</row>
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<row>
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<entry>mappedWhenManaged</entry>
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<entry>MappedWhenManaged</entry>
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<entry>Boolean</entry>
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<entry></entry>
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<entry>True</entry>
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</row>
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<row>
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<entry>numberStrings</entry>
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<entry>NumberStrings</entry>
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<entry>int</entry>
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<entry>A</entry>
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<entry>computed for NULL terminated list</entry>
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</row>
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<row>
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<entry>pasteBuffer</entry>
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<entry>Boolean</entry>
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<entry>Boolean</entry>
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<entry></entry>
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<entry>False</entry>
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</row>
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<row>
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<entry>pointerColor</entry>
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<entry>Foreground</entry>
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<entry>Pixel</entry>
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<entry></entry>
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<entry>XtDefaultForeground</entry>
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</row>
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<row>
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<entry>pointerColorBackground</entry>
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<entry>Background</entry>
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<entry>Pixel</entry>
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<entry></entry>
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<entry>XtDefaultBackground</entry>
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</row>
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<row>
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<entry>rowSpacing</entry>
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<entry>Spacing</entry>
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<entry>Dimension</entry>
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<entry></entry>
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<entry>2</entry>
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</row>
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<row>
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<entry>screen</entry>
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<entry>Screen</entry>
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<entry>Screen</entry>
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<entry>R</entry>
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<entry>Parent's Screen</entry>
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</row>
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<row>
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<entry>sensitive</entry>
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<entry>Sensitive</entry>
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<entry>Boolean</entry>
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<entry></entry>
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<entry>True</entry>
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</row>
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<row>
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<entry>translations</entry>
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<entry>Translations</entry>
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<entry>TranslationTable</entry>
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<entry></entry>
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<entry>See below</entry>
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</row>
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<row>
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<entry>verticalList</entry>
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<entry>Boolean</entry>
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<entry>Boolean</entry>
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<entry></entry>
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<entry>False</entry>
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</row>
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<row>
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<entry>width</entry>
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<entry>Width</entry>
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<entry>Dimension</entry>
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<entry>A</entry>
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<entry>Enough space to contain the list</entry>
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</row>
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<row>
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<entry>x</entry>
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<entry>Position</entry>
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<entry>Position</entry>
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<entry></entry>
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<entry>0</entry>
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</row>
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<row>
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<entry>y</entry>
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<entry>Position</entry>
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<entry>Position</entry>
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<entry></entry>
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<entry>0</entry>
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</row>
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<row>
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<entry>_</entry>
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</row>
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</tbody>
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</tgroup>
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</informaltable>
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<!-- .Ac -->
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<!-- .As -->
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<!-- .Bg -->
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<!-- .Gp -->
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<!-- .Bc -->
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<!-- .Bp -->
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<!-- .Bw -->
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<variablelist>
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<varlistentry>
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<term>
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<function>callback</function>
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</term>
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<listitem>
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<para>
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All functions on this list are called whenever the <function>notify</function> action is
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invoked. The <emphasis remap='I'>call_data</emphasis> argument contains information about the element
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selected and is described in detail in the <function>List Callbacks</function> section.
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<!-- .Cm -->
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term>
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<function>columnSpacing</function>
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</term>
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<listitem>
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<para>
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<!-- .br -->
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<!-- .ns -->
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term>
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<function>rowSpacing</function>
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</term>
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<listitem>
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<para>
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The amount of space, in pixels, between each of the rows and columns
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in the list.
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<!-- .Cu -->
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<!-- .Cn -->
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term>
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<function>defaultColumns</function>
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</term>
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<listitem>
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<para>
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The default number of columns. This value is used when neither the
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width nor the height of the List widget is specified or when
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<function>forceColumns</function> is <function>True</function>.
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<!-- .Dp -->
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<!-- .Dc -->
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term>
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<function>font</function>
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</term>
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<listitem>
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<para>
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The text font to use when displaying the <function>list</function>, when the
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<function>international</function> resource is <function>false</function>.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term>
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<function>fontSet</function>
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</term>
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<listitem>
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<para>
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The text font set to use when displaying the <function>list</function>, when the
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<function>international</function> resource is <function>true</function>.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term>
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<function>forceColumns</function>
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</term>
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<listitem>
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<para>
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Forces the default number of columns to be used regardless of the
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List widget's current size.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term>
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<function>foreground</function>
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</term>
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<listitem>
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<para>
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A pixel value which indexes the widget's colormap to derive the color
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used to paint the text of the list elements.
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<!-- .Hw -->
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<!-- .Ib -->
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term>
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\fPinternalHeight\fP
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</term>
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<listitem>
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<para>
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<!-- .br -->
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<!-- .ns -->
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term>
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\fPinternalWidth\fP
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</term>
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<listitem>
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<para>
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The margin, in pixels, between the edges of the list and the
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corresponding edge of the List widget's window.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term>
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<function>list</function>
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</term>
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<listitem>
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<para>
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An array of text strings displayed in the List widget. If
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<function>numberStrings</function> is zero (the default) then the <function>list</function> must be
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NULL terminated. If a value is not specified for the <function>list</function>, then
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<function>numberStrings</function> is set to 1, and the name of the widget is used as
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the <function>list</function>, and <function>longest</function> is set to the length of the name of the
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widget. The <function>list</function> is used in place, and must be available
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to the List widget for the lifetime of this widget, or until it is
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changed with <xref linkend='XtSetValues' xrefstyle='select: title'/> or <xref linkend='XawListChange' xrefstyle='select: title'/>.
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<!-- .In -->
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term>
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<function>longest</function>
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</term>
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<listitem>
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<para>
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Specifies the width, in pixels, of the longest string in the current
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list. The List widget will compute this value if zero (the default)
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is specified. If this resource is set by hand, entries longer than this
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will be clipped to fit.
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<!-- .Mm -->
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term>
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<function>numberStrings</function>
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</term>
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<listitem>
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<para>
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The number of strings in the current list. If a value of zero (the
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default) is specified, the List widget will compute it. When computing
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the number of strings the List widget assumes that the <function>list</function> is NULL
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terminated.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term>
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<function>pasteBuffer</function>
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</term>
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<listitem>
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<para>
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If this resource is set to <function>True</function> then the name of the currently
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selected list element will be put into <function>CUT_BUFFER_0</function>.
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<!-- .Pf -->
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<!-- .Pb -->
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<!-- .Sc -->
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<!-- .Se -->
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<!-- .Tr -->
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term>
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<function>verticalList</function>
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</term>
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<listitem>
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<para>
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If this resource is set to <function>True</function> then the list elements will be
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presented in column major order.
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<!-- .Xy -->
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</para>
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</listitem>
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</varlistentry>
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</variablelist>
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</para>
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</sect2>
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<sect2 id="List_Actions">
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<title>List Actions</title>
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<!-- .IN "List widget" "actions" -->
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<para>
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<!-- .LP -->
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The List widget supports the following actions:
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</para>
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<itemizedlist>
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<listitem>
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<para>
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Highlighting and unhighlighting the list element under the
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pointer with <function>Set</function> and <function>Unset</function>
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</para>
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</listitem>
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<listitem>
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<para>
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Processing application callbacks with <function>Notify</function>
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</para>
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</listitem>
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</itemizedlist>
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<para>
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<!-- .LP -->
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The following is the default translation table used by the List Widget:
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<!-- .IN "List widget" "default translation table" -->
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</para>
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<para>
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<!-- .LP -->
|
|
<literallayout class="monospaced">
|
|
<!-- .TA .5i 2.25i -->
|
|
<!-- .ta .5i 2.25i -->
|
|
<Btn1Down>,<Btn1Up>: Set(\|) Notify(\|)
|
|
<!-- .sp -->
|
|
</literallayout>
|
|
</para>
|
|
<para>
|
|
<!-- .LP -->
|
|
The full list of actions supported by List widget is:
|
|
<variablelist>
|
|
<varlistentry>
|
|
<term>
|
|
<function>Set</function>(\|)
|
|
</term>
|
|
<listitem>
|
|
<para>
|
|
<emphasis remap='I'>Sets</emphasis> the list element that is currently under the pointer. To
|
|
inform the user that this element is currently set, it is drawn with
|
|
foreground and background colors reversed. If this action is called when
|
|
there is no list element under the cursor, the currently <emphasis remap='I'>set</emphasis>
|
|
element will be <emphasis remap='I'>unset</emphasis>.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term>
|
|
<function>Unset</function>(\|)
|
|
</term>
|
|
<listitem>
|
|
<para>
|
|
Cancels the <emphasis remap='I'>set</emphasis> state of the element under the pointer,
|
|
and redraws it with normal foreground and background colors.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term>
|
|
<function>Notify</function>(\|)
|
|
</term>
|
|
<listitem>
|
|
<para>
|
|
Calls all callbacks on the List widget's callback list. Information
|
|
about the currently selected list element is passed in the
|
|
<emphasis remap='I'>call_data</emphasis> argument (see <function>List Callbacks</function> below).
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
</variablelist>
|
|
</para>
|
|
</sect2>
|
|
<sect2 id="List_Callbacks">
|
|
<title>List Callbacks</title>
|
|
<!-- .IN "List widget" "callbacks" -->
|
|
<para>
|
|
<!-- .LP -->
|
|
All procedures on the List widget's callback list will have a
|
|
<function>XawListReturnStruct</function> passed to them as <emphasis remap='I'>call_data</emphasis>. The
|
|
structure is defined in the List widget's application header file.
|
|
</para>
|
|
<!-- .LP -->
|
|
<literallayout class="monospaced">
|
|
<!-- .TA .5i 2.25i -->
|
|
<!-- .ta .5i 2.25i -->
|
|
<!-- .IN "XawListReturnStruct" "" "@DEF@" -->
|
|
typedef struct _XawListReturnStruct {
|
|
String string; /* string shown in the list. */
|
|
int list_index; /* index of the item selected. */
|
|
} XawListReturnStruct;
|
|
<!-- .IN "XawListReturnStruct" "" -->
|
|
<!-- .NT -->
|
|
</literallayout>
|
|
<note><para>
|
|
The <emphasis remap='I'>list_index</emphasis> item used to be called simply <emphasis remap='I'>index</emphasis>.
|
|
Unfortunately, this name collided with a global name defined on some
|
|
operating systems, and had to be changed.
|
|
</para></note>
|
|
<!-- .NE -->
|
|
</sect2>
|
|
<sect2 id="Changing_the_List">
|
|
<title>Changing the List</title>
|
|
<para>
|
|
<!-- .LP -->
|
|
To change the list that is displayed, use
|
|
<function>XawListChange .</function>
|
|
<!-- .IN "XawListChange" "" "@DEF@" -->
|
|
<funcsynopsis id='XawListChange'>
|
|
<funcprototype>
|
|
<funcdef>void<function> XawListChange</function></funcdef>
|
|
<paramdef>Widget<parameter> w</parameter></paramdef>
|
|
<paramdef>String*<parameter> list</parameter></paramdef>
|
|
<paramdef>intnitems,<parameter> longest</parameter></paramdef>
|
|
<paramdef>Boolean<parameter> resize</parameter></paramdef>
|
|
</funcprototype>
|
|
</funcsynopsis>
|
|
<!-- .FN -->
|
|
<variablelist>
|
|
<varlistentry>
|
|
<term>
|
|
<emphasis remap='I'>w</emphasis>
|
|
</term>
|
|
<listitem>
|
|
<para>
|
|
Specifies the List widget.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term>
|
|
<emphasis remap='I'>list</emphasis>
|
|
</term>
|
|
<listitem>
|
|
<para>
|
|
Specifies the new list for the List widget to display.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term>
|
|
<emphasis remap='I'>nitems</emphasis>
|
|
</term>
|
|
<listitem>
|
|
<para>
|
|
Specifies the number of items in the <emphasis remap='I'>list</emphasis>. If a value less than 1
|
|
is specified, <emphasis remap='I'>list</emphasis> must be NULL terminated, and the number of
|
|
items will be calculated by the List widget.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term>
|
|
<emphasis remap='I'>longest</emphasis>
|
|
</term>
|
|
<listitem>
|
|
<para>
|
|
Specifies the length of the longest item in the <emphasis remap='I'>list</emphasis> in pixels.
|
|
If a value less than 1 is specified, the List widget will calculate the
|
|
value.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term>
|
|
<emphasis remap='I'>resize</emphasis>
|
|
</term>
|
|
<listitem>
|
|
<para>
|
|
Specifies a Boolean value that if <function>True</function> indicates that the
|
|
List widget should try to resize itself after making the change.
|
|
The constraints of the List widget's parent are always enforced,
|
|
regardless of the value specified here.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
</variablelist>
|
|
</para>
|
|
<para>
|
|
<!-- .LP -->
|
|
<xref linkend='XawListChange' xrefstyle='select: title'/>
|
|
will <emphasis remap='I'>unset</emphasis> all list elements that are currently <function>set</function> before
|
|
the list is actually changed. The <emphasis remap='I'>list</emphasis> is used in place, and must
|
|
remain usable for the lifetime of the List widget, or until <emphasis remap='I'>list</emphasis>
|
|
has been changed again with this function or with <xref linkend='XtSetValues' xrefstyle='select: title'/>.
|
|
</para>
|
|
</sect2>
|
|
<sect2 id="Highlighting_an_Item">
|
|
<title>Highlighting an Item</title>
|
|
<para>
|
|
<!-- .LP -->
|
|
To highlight an item in the list, use
|
|
<function>XawListHighlight .</function>
|
|
<!-- .IN "XawListHighlight" "" "@DEF@" -->
|
|
<funcsynopsis id='XawListHighlight'>
|
|
<funcprototype>
|
|
<funcdef>void<function> XawListHighlight</function></funcdef>
|
|
<paramdef>Widget<parameter> w</parameter></paramdef>
|
|
<paramdef>int<parameter> item</parameter></paramdef>
|
|
</funcprototype>
|
|
</funcsynopsis>
|
|
<!-- .FN -->
|
|
<variablelist>
|
|
<varlistentry>
|
|
<term>
|
|
<emphasis remap='I'>w</emphasis>
|
|
</term>
|
|
<listitem>
|
|
<para>
|
|
Specifies the List widget.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term>
|
|
<emphasis remap='I'>item</emphasis>
|
|
</term>
|
|
<listitem>
|
|
<para>
|
|
Specifies an index into the current list that indicates the item to be
|
|
highlighted.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
</variablelist>
|
|
</para>
|
|
<para>
|
|
<!-- .LP -->
|
|
Only one item can be highlighted at a time.
|
|
If an item is already highlighted when
|
|
<xref linkend='XawListHighlight' xrefstyle='select: title'/>
|
|
is called,
|
|
the highlighted item is unhighlighted before the new item is highlighted.
|
|
</para>
|
|
</sect2>
|
|
<sect2 id="Unhighlighting_an_Item">
|
|
<title>Unhighlighting an Item</title>
|
|
<para>
|
|
<!-- .LP -->
|
|
To unhighlight the currently highlighted item in the list, use
|
|
<function>XawListUnhighlight .</function>
|
|
<!-- .IN "XawListUnhighlight" "" "@DEF@" -->
|
|
<funcsynopsis id='XawListUnhighlight'>
|
|
<funcprototype>
|
|
<funcdef>void<function> XawListUnhighlight</function></funcdef>
|
|
<paramdef>Widget<parameter> w</parameter></paramdef>
|
|
</funcprototype>
|
|
</funcsynopsis>
|
|
<!-- .FN -->
|
|
<variablelist>
|
|
<varlistentry>
|
|
<term>
|
|
<emphasis remap='I'>w</emphasis>
|
|
</term>
|
|
<listitem>
|
|
<para>
|
|
Specifies the List widget.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
</variablelist>
|
|
</para>
|
|
</sect2>
|
|
<sect2 id="Retrieving_the_Currently_Selected_Item">
|
|
<title>Retrieving the Currently Selected Item</title>
|
|
<para>
|
|
<!-- .LP -->
|
|
To retrieve the list element that is currently <emphasis remap='I'>set</emphasis>, use
|
|
<function>XawListShowCurrent .</function>
|
|
<!-- .IN "XawListShowCurrent" "" "@DEF@" -->
|
|
<funcsynopsis id='XawListShowCurrent'>
|
|
<funcprototype>
|
|
<funcdef>XawListReturnStruct<function> *XawListShowCurrent</function></funcdef>
|
|
<paramdef>Widget<parameter> w</parameter></paramdef>
|
|
</funcprototype>
|
|
</funcsynopsis>
|
|
<!-- .FN -->
|
|
<variablelist>
|
|
<varlistentry>
|
|
<term>
|
|
<emphasis remap='I'>w</emphasis>
|
|
</term>
|
|
<listitem>
|
|
<para>
|
|
Specifies the List widget.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
</variablelist>
|
|
</para>
|
|
<para>
|
|
<!-- .LP -->
|
|
<function>XawListShowCurrent</function>
|
|
returns a pointer to an
|
|
<function>XawListReturnStruct</function>
|
|
structure,
|
|
containing the currently highlighted item.
|
|
If the value of the index member is XAW_LIST_NONE,
|
|
<!-- .IN "XAW_LIST_NONE" -->
|
|
the string member is undefined, and no item is currently selected.
|
|
</para>
|
|
</sect2>
|
|
<sect2 id="Restrictions">
|
|
<title>Restrictions</title>
|
|
<para>
|
|
<!-- .LP -->
|
|
Many programmers create a ``scrolled list'' by putting a List
|
|
widget with many entries as a child of a Viewport widget. The
|
|
List continues to create a window as big as its contents, but
|
|
that big window is only visible where it intersects the parent
|
|
Viewport's window. (I.e., it is ``clipped.'')
|
|
</para>
|
|
<para>
|
|
<!-- .LP -->
|
|
While this is a useful technique, there is a serious drawback.
|
|
X does not support windows above 32,767 pixels in width or
|
|
height, but this height limit will be exceeded by a List's
|
|
window when the List has many entries (i.e., with a 12 point
|
|
font, about 3000 entries would be too many.)
|
|
</para>
|
|
<para>
|
|
<!-- .LP -->
|
|
|
|
</para>
|
|
</sect2>
|
|
</sect1>
|