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<TITLE>Developer.com - Online Reference Library - 0672311739:RED HAT LINUX 2ND EDITION:tcl and tk Programming</TITLE>
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<!-- TITLE=RED HAT LINUX 2ND EDITION //-->
<!-- AUTHOR=DAVID PITTS ET AL //-->
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<!-- PUBLICATION DATE=1998 //-->
<!-- CHAPTER=25 //-->
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<A NAME="PAGENUM-526"><P>Page 526</P></A>
<P>Listing 25.1. continued
</P>
<!-- CODE //-->
<PRE>
proc setColor {value} {
global color;
foreach i {red green blue} {
set $i [format %02x [.scale_$i get]];
}
set color "#$red$green$blue";
.preview_label configure -bg $color;
.message_label configure -text "$color";
}
proc make_preview {} {
global color;
frame .preview_frame;
label .preview_label -bg $color \
-height 5 -width 5;
pack .preview_label -in .preview_frame \
-padx 2 -pady 2 -fill both -anchor c \
-expand 1;
pack .preview_frame -in .control_frame \
-side top -fill both -expand 1 \
-padx 2 -pady 2;
}
proc make_buttons {} {
frame .button_frame;
button .apply -text "apply" -command setRootColor;
button .quit -text "quit" -command exit;
pack .apply .quit -in .button_frame -fill both \
-expand 1 -padx 2 -pady 2 -side left;
pack .button_frame -in .main_frame -fill both;
}
proc setRootColor {} {
global color;
catch {
exec xsetroot -solid $color;
} msg;
if {$msg != {}} {
set msg "An error occurred";
} else {
set msg "$color";
}
.message_label configure -text $msg;
}
make_message_label;
make_scales;
make_preview;
</PRE>
<!-- END CODE //-->
<P>make_buttons;
</P>
<A NAME="PAGENUM-527"><P>Page 527</P></A>
<H3><A NAME="ch25_ 24">
Summary
</A></H3>
<P>This chapter is an introduction to programming in
tcl/tk. The examples demonstrate the power of
tcl/tk, which lies in the ability to make user interfaces within a short amount of time
and with little code. Although this chapter covers many of the features of
tcl/tk, there are many more that are not discussed. I hope that with this chapter as a stepping stone, you will
enjoy many years developing tcl/tk applications.
</P>
<A NAME="PAGENUM-528"><P>Page 528</P></A>
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