Perl/TkFAQ-10.13.如何在Text组件中获得某个标签的范围
原文：
10.13. How do I select a range of tags in a Text widget?
A question arose concerning getting a range of selections from a Text widget. Nick Ing-Simmons' answer mentions several possibilities including:
Keyboard Copy/Paste 'is' implemented of course...
Subj: RE: $Text->tag('ranges', 'sel') - does this work?In <199512291957.OAA02609@ohm.nrl.navy.mil>On Fri, 29 Dec 1995 14:57:42 -0500Charles J Williams <chas@ohm.nrl.navy.mil> writes:!I was writing a little tk perl today, and i decided to try to !implement a copy/paste using the 'sel' tag!!I enabled exportselection, and then try to probe the select !region with:!! $buffer = $text->tag('ranges', 'sel');!!$buffer comes back with one entry, the end of the selection.
That is to be expected - the scalar gets assigned the last element of the list.
!I tried:!! @buffer = $text->tag('ranges', 'sel');!!same difference.
This seems to work for me:
($start,$end) = $text->tagRanges('sel');
In perl/Tk ->tagRanges(...) is an alias for ->tag('ranges',...)
The following subroutine can also probe and print the tagRanges:
sub showsel { my $text = @_; my @info = $text->tagRanges('sel'); if (@info) { print "start=$info[0] end=$info[1]\n" } }
译文：
10.13. 如何在Text组件中获得某个标签的范围？
这是一个关于在Text组件中如何获得所选择文字的范围的问题。下面就是作者Nick Ing-Simmons的回答：
键盘的复制和粘贴确实是可以实现的……
主题：回复：$Text->tag(‘ranges’,’sel’) – 可以吗？
在<199512291957.OAA02609@ohm.nrl.navy.mil>
On Fri, 29 Dec 1995 14:57:42 –0500
Charles J Williams写到：
！我今天在写一些Perl/Tk的脚本，其中我想试着用’sel’的标签来实现复制和粘贴的功能。
！我启用了portselection，然后试图用下面的方法来获得所选择的区域：
！
！ $buffer = $text -> tag(‘ranges’,’sel’);
！
！但是，$buffer获得的只是一条记录——是选择区域的结束点。
这是意料之中的，因为标量只能获得列表的最后一个值。
！我又尝试了下面的方法：
！
！ @buffer = $text -> $tag(‘ranges’,’sel’);
！
！有些不同。
我觉得这样应该可以：
($start,$end) = $text -> tagRanges(‘sel’);
注：在Perl/Tk中->tagRanges(…)与->tag(‘ranges’,…)是等价的。
下面的子程序也可以获取并输出tagRanges的结果：
sub showsel
{
my $text = @_;
my @info = $text->tagRanges('sel');
if (@info)
{
print "start=$info[0] end=$info[1]\n"
}
}
