41 lines
2.3 KiB
HTML
41 lines
2.3 KiB
HTML
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<TITLE> The ConstructWidget Method<A NAME=642> </A></TITLE>
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<HR> <A NAME=tex2html1256 HREF=subsubsection3_8_4_5.html><IMG ALIGN=MIDDLE SRC="../gif/icons/next_motif.gif"></A> <A NAME=tex2html1254 HREF=subsection3_8_4.html><IMG ALIGN=MIDDLE SRC="../gif/icons/up_motif.gif"></A> <A NAME=tex2html1248 HREF=subsubsectionstar3_8_4_3.html><IMG ALIGN=MIDDLE SRC="../gif/icons/previous_motif.gif"></A> <A NAME=tex2html1258 HREF=tableofcontents3_1.html><IMG ALIGN=MIDDLE SRC="../gif/icons/contents_motif.gif"></A> <BR>
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<B> Next:</B> <A NAME=tex2html1257 HREF=subsubsection3_8_4_5.html> The SetBindings Method</A>
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<B>Up:</B> <A NAME=tex2html1255 HREF=subsection3_8_4.html> Standard Initialization Methods</A>
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<B> Previous:</B> <A NAME=tex2html1249 HREF=subsubsectionstar3_8_4_3.html> The tixChainMethod call</A>
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<HR> <P>
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<A NAME=Contents> </A><H3><A NAME=SECTION00084400000000000000> The ConstructWidget Method<A NAME=642> </A></A></H3>
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<P>
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The <tt>ConstructWidget</tt> method is used to creates the components
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of a widget instance. In the case of TixArrowButton, we want to
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create a new button subwidget, whose name is <tt>button</tt>, and use a
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bitmap to display an arrow on this button. Assuming the bitmap files
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are stored in the files <tt>up.xbm</tt>, <tt>down.xbm</tt>, <tt>left.xbm</tt>
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and <tt>right.xbm</tt>, the string substitution <tt>@$data(-direction).xbm</tt> will give us the appropriate bitmap
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depending on the current direction option of the widget instance.
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<P>
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<blockquote> <P><tt> proc tixArrowButton:ConstructWidget {w} {<BR>
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upvar #0 $w data<BR>
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<BR>
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tixChainMethod $w ConstructWidget<BR>
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<BR>
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set data(w:button) [button $w.button -bitmap @$data(-direction).xbm]<BR>
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pack $data(w:button) -expand yes -fill both<BR>
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}</tt>
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<P></blockquote>
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<P>The <tt>tixArrowButton:ConstructWidget</tt> method shown above sets
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the variable <tt>data(w:button)</tt> to be the pathname of the <tt>button</tt> subwidget. As a convention of the Tix Intrinsics, we must
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declare a public subwidget <em>swid</em> by storing its pathname in the
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variable <tt>data(w:</tt><em>swid</em><tt>)</tt>.
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<P>
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<HR>
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<P><ADDRESS>
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<A HREF=http://tix.sourceforge.net>http://tix.sourceforge.net</A><BR>
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</ADDRESS> |