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<!DOCTYPE html>
<html>
<head>
<title>Wcb Command Reference</title>
<meta name="Author" content="Csaba Nemethi">
<meta name="Keywords" content=
"callback, widget, Tk entry, Ttk entry, BWidget Entry, Tk spinbox, Ttk spinbox, Ttk combobox, listbox, tablelist, Ttk treeview, text, ctext">
<link rel="stylesheet" type="text/css" href="stylesheet.css">
</head>
<body>
<div align="center">
<h1>Wcb Command Reference</h1>
<h2>For Wcb Version 4.1</h2>
<h3>by</h3>
<h2>Csaba Nemethi</h2>
<address>
<a href="mailto:csaba.nemethi@t-online.de">csaba.nemethi@t-online.de</a>
</address>
</div>
<hr>
<h2 id="contents">Contents</h2>
<ul>
<li><a href="#callback">The <code><b>wcb::callback</b></code>
Command</a></li>
<li><a href="#cbappend">The <code><b>wcb::cbappend</b></code>
Command</a></li>
<li><a href="#cbprepend">The <code><b>wcb::cbprepend</b></code>
Command</a></li>
<li><a href="#cancel">The <code><b>wcb::cancel</b></code> Command</a></li>
<li><a href="#canceled">The <code><b>wcb::canceled</b></code>
Command</a></li>
<li><a href="#extend">The <code><b>wcb::extend</b></code> Command</a></li>
<li><a href="#replace">The <code><b>wcb::replace</b></code>
Command</a></li>
<li><a href="#pathname">The <code><b>wcb::pathname</b></code>
Command</a></li>
<li><a href="#changeEntryText">The <code><b>wcb::changeEntryText</b></code>
Command</a></li>
<li><a href="#postInsertEntryLen">The
<code><b>wcb::postInsertEntryLen</b></code> Command</a></li>
<li><a href="#postInsertEntryText">The
<code><b>wcb::postInsertEntryText</b></code> Command</a></li>
<li><a href="#postDeleteEntryText">The
<code><b>wcb::postDeleteEntryText</b></code> Command</a></li>
<li><a href="#entrycb">Before-<code><b>insert</b></code> Callbacks for
entry, spinbox, and combobox Widgets</a></li>
<li><a href="#textcb">Before-<code><b>insert</b></code> Callbacks for text
and ctext Widgets</a></li>
</ul>
<div align="center">
<p><a href="index.html">Start page</a></p>
</div>
<hr>
<h2 id="callback">The <code><b>wcb::callback</b></code> Command</h2>
<dl>
<dt><b>NAME</b></dt>
<dd><code>wcb::callback</code> – Retrieve, set, and remove widget
callbacks</dd>
<dt class="tm"><b>SYNOPSIS</b></dt>
<dd>
<pre>
<b>wcb::callback</b> <i>widgetName</i> <b>before</b>|<b>after</b> <i>option</i> ?<i>callback</i> <i>callback</i> ...?
</pre>
</dd>
<dt><b>DESCRIPTION</b></dt>
<dd>Retrieves, sets, or removes the callbacks for the Tk or Ttk entry,
BWidget Entry, Tk or Ttk spinbox, Ttk combobox, listbox, tablelist, Ttk
treeview, text, or ctext widget <code><i>widgetName</i></code>, the
argument <code><b>before</b></code> or <code><b>after</b></code>, and the
command corresponding to <code><i>option</i></code>. The values of
the <code><i>option</i></code> argument can be:</dd>
<dd class="tm">
<ul>
<li><code><b>insert</b></code>, <code><b>delete</b></code>, or
<code><b>motion</b></code>, for a Tk or Ttk entry, BWidget Entry, Tk
or Ttk spinbox, Ttk combobox, text, or ctext widget;</li>
<li><code><b>replace</b></code>, for a text or ctext widget;</li>
<li><code><b>activate</b></code>, for a listbox, tablelist, or Ttk
treeview widget;</li>
<li><code><b>selset</b></code> or <code><b>selclear</b></code>, for a
listbox, tablelist, Ttk treeview, text, or ctext widget;</li>
<li><code><b>seladd</b></code> or <code><b>seltoggle</b></code>, for a
Ttk treeview widget;</li>
<li><code><b>cellselset</b></code> or <code><b>cellselclear</b></code>,
for a tablelist or Ttk treeview widget;</li>
<li><code><b>cellseladd</b></code> or
<code><b>cellseltoggle</b></code>, for a Ttk treeview widget;</li>
<li><code><b>activatecell</b></code>, for a tablelist widget.</li>
</ul>
</dd>
<dd class="tm">If no arguments after the <code><i>option</i></code>
parameter are specified, then the procedure just returns the current
before- or after-callback list, respectively, for the given widget
operation.</dd>
<dd class="tm">Otherwise:</dd>
<dd>
<ul>
<li>
<p>If at least one of the arguments following the
<code><i>option</i></code> parameter is a nonempty string, then:</p>
<ul>
<li>if called for the first time for this widget with at least one
nonempty argument following the <code><i>option</i></code>
parameter, then the procedure renames the Tcl command
<code>::<i>widgetName</i></code> to
<code>::_<i>widgetName</i></code> and builds a new procedure
<code>::<i>widgetName</i></code>, in which the execution of the
widget operations associated with the above values of
<code><i>option</i></code> is preceded by invocations of the
corresponding before-callbacks and followed by calls to the
corresponding after-callbacks, in the global scope;</li>
<li class="tm">it sets the callback list to the one built from
these arguments and returns the new list.</li>
</ul>
</li>
<li class="tm">If all arguments following the
<code><i>option</i></code> parameter are empty, then the procedure
unregisters all the corresponding before- or after-callbacks for the
given widget and returns an empty string.</li>
</ul>
</dd>
<dd class="tm">When a callback is invoked for the widget
<code><i>widgetName</i></code>, the name of the <b>proxy command</b>
<code>::_<i>widgetName</i></code> and the command arguments are
automatically appended to it as parameters. Use the <code><b><a href=
"#pathname">wcb::pathname</a></b></code> command to retrieve the original
widget path name.</dd>
<dd class="tm">The following table shows the widget subcommands
corresponding to the above values of <code><i>option</i></code>, together
with the arguments of these subcommands:</dd>
<dd class="tm" id="callback_table">
<table border="2" cellspacing="0" cellpadding="3">
<tr bgcolor="#FFFFE0">
<th align="left">Widget</th>
<th align="left"><code><i>option</i></code></th>
<th align="left">Subcommand</th>
<th align="left">Arguments</th>
</tr>
<tr>
<td rowspan="3">Tk entry, ttk::entry,<br>
BWidget Entry,<br>
Tk spinbox, ttk::spinbox,<br>
or ttk::combobox</td>
<td><code><b>insert</b></code></td>
<td><code><b>insert</b></code></td>
<td><code><i>index</i> <i>string</i></code></td>
</tr>
<tr>
<td><code><b>delete</b></code></td>
<td><code><b>delete</b></code></td>
<td><code><i>from</i> ?<i>to</i>?</code></td>
</tr>
<tr>
<td><code><b>motion</b></code></td>
<td><code><b>icursor</b></code></td>
<td><code><i>index</i></code></td>
</tr>
<tr>
<td rowspan="3">listbox</td>
<td><code><b>activate</b></code></td>
<td><code><b>activate</b></code></td>
<td><code><i>index</i></code></td>
</tr>
<tr>
<td><code><b>selset</b></code></td>
<td><code><b>selection set</b></code></td>
<td><code><i>first</i> ?<i>last</i>?</code></td>
</tr>
<tr>
<td><code><b>selclear</b></code></td>
<td><code><b>selection clear</b></code></td>
<td><code><i>first</i> ?<i>last</i>?</code></td>
</tr>
<tr>
<td rowspan="6">tablelist::tablelist</td>
<td><code><b>activate</b></code></td>
<td><code><b>activate</b></code></td>
<td><code><i>index</i></code></td>
</tr>
<tr>
<td><code><b>selset</b></code></td>
<td><code><b>selection set</b></code></td>
<td><code><i>first</i> ?<i>last</i>?</code>
(<code><i>indexList</i></code> or
<code><i>firstIndex</i> <i>lastIndex</i></code>)</td>
</tr>
<tr>
<td><code><b>selclear</b></code></td>
<td><code><b>selection clear</b></code></td>
<td><code><i>first</i> ?<i>last</i>?</code>
(<code><i>indexList</i></code> or
<code><i>firstIndex</i> <i>lastIndex</i></code>)</td>
</tr>
<tr>
<td><code><b>activatecell</b></code></td>
<td><code><b>activatecell</b></code></td>
<td><code><i>cellIndex</i></code></td>
</tr>
<tr>
<td><code><b>cellselset</b></code></td>
<td><code><b>cellselection set</b></code></td>
<td><code><i>first</i> ?<i>last</i>?</code>
(<code><i>cellIndexList</i></code> or
<code><i>firstCell</i> <i>lastCell</i></code>)</td>
</tr>
<tr>
<td><code><b>cellselclear</b></code></td>
<td><code><b>cellselection clear</b></code></td>
<td><code><i>first</i> ?<i>last</i>?</code>
(<code><i>cellIndexList</i></code> or
<code><i>firstCell</i> <i>lastCell</i></code>)</td>
</tr>
<tr>
<td rowspan="9">ttk::treeview</td>
<td><code><b>activate</b></code></td>
<td><code><b>focus</b></code></td>
<td><code><i>item</i></code></td>
</tr>
<tr>
<td><code><b>selset</b></code></td>
<td><code><b>selection set</b></code></td>
<td><code><i>itemList</i></code></td>
</tr>
<tr>
<td><code><b>seladd</b></code></td>
<td><code><b>selection add</b></code></td>
<td><code><i>itemList</i></code></td>
</tr>
<tr>
<td><code><b>selclear</b></code></td>
<td><code><b>selection remove</b></code></td>
<td><code><i>itemList</i></code></td>
</tr>
<tr>
<td><code><b>seltoggle</b></code></td>
<td><code><b>selection toggle</b></code></td>
<td><code><i>itemList</i></code></td>
</tr>
<tr>
<td><code><b>cellselset</b></code></td>
<td><code><b>cellselection set</b></code></td>
<td><code><i>first</i> ?<i>last</i>?</code>
(<code><i>cellList</i></code> or
<code><i>firstCell</i> <i>lastCell</i></code>)</td>
</tr>
<tr>
<td><code><b>cellseladd</b></code></td>
<td><code><b>cellselection add</b></code></td>
<td><code><i>first</i> ?<i>last</i>?</code>
(<code><i>cellList</i></code> or
<code><i>firstCell</i> <i>lastCell</i></code>)</td>
</tr>
<tr>
<td><code><b>cellselclear</b></code></td>
<td><code><b>cellselection remove</b></code></td>
<td><code><i>first</i> ?<i>last</i>?</code>
(<code><i>cellList</i></code> or
<code><i>firstCell</i> <i>lastCell</i></code>)</td>
</tr>
<tr>
<td><code><b>cellseltoggle</b></code></td>
<td><code><b>cellselection toggle</b></code></td>
<td><code><i>first</i> ?<i>last</i>?</code>
(<code><i>cellList</i></code> or
<code><i>firstCell</i> <i>lastCell</i></code>)</td>
</tr>
<tr>
<td rowspan="6">text or ctext</td>
<td><code><b>insert</b></code></td>
<td><code><b>insert</b></code></td>
<td><code><i>index</i> <i>string</i> ?<i>tagList</i> <i>string</i>
<i>tagList</i> ...?</code></td>
</tr>
<tr>
<td><code><b>delete</b></code></td>
<td><code><b>delete</b></code></td>
<td><code><i>from</i> ?<i>to</i>?</code></td>
</tr>
<tr>
<td><code><b>replace</b></code></td>
<td><code><b>replace</b></code></td>
<td><code><i>from</i> <i>to</i> <i>string</i> ?<i>tagList</i>
<i>string</i> <i>tagList</i> ...?</code></td>
</tr>
<tr>
<td><code><b>motion</b></code></td>
<td><code><b>mark set insert</b></code></td>
<td><code><i>index</i></code></td>
</tr>
<tr>
<td><code><b>selset</b></code></td>
<td><code><b>tag add sel</b></code></td>
<td><code><i>from</i> ?<i>to</i> <i>from</i> <i>to</i>
...?</code></td>
</tr>
<tr>
<td><code><b>selclear</b></code></td>
<td><code><b>tag remove sel</b></code></td>
<td><code><i>from</i> ?<i>to</i> <i>from</i> <i>to</i>
...?</code></td>
</tr>
</table>
</dd>
<dd class="tm"><b>REMARKS:</b></dd>
<dd class="tm">
<ol>
<li>You may abbreviate the words <code><b>before</b></code>,
<code><b>after</b></code>, <code><b>insert</b></code>,
<code><b>delete</b></code>, <code><b>replace</b></code>,
<code><b>motion</b></code>, and <code><b>activate</b></code> (the
latter not for tablelist widgets) to a minimum of one character.
Similarly, the first four characters of the words
<code><b>selset</b></code>, <code><b>selclear</b></code>,
<code><b>seladd</b></code>, and <code><b>seltoggle</b></code>, the
first eight characters of <code><b>cellselset</b></code>,
<code><b>cellselclear</b></code>, <code><b>cellseladd</b></code>, and
<code><b>cellseltoggle</b></code>, and the first nine characters of
<code><b>activatecell</b></code> are sufficient for Wcb to recognize
these options.</li>
<li class="tm">After a successful invocation of this command with at
least one nonempty callback following the <code><i>option</i></code>
argument, you can use either the new procedure
<code><i>widgetName</i></code> or the proxy command
<code>::_<i>widgetName</i></code> to perform any valid operation on the
widget <code><i>widgetName</i></code>. Use the proxy command
<code>::_<i>widgetName</i></code> if you want to prevent the callbacks
from being invoked when executing the respective widget
subcommand.</li>
<li class="tm">When destroying a widget <code><i>widgetName</i></code>
for which <code><b>wcb::callback</b></code> has replaced the
corresponding Tcl command with a new procedure, the proxy command
<code>::_<i>widgetName</i></code> is deleted automatically by the Tcl
interpreter (this is not true in the case of a BWidget Entry,
tablelist, or ctext widget). The new widget procedure
<code><i>widgetName</i></code> would persist, but Wcb arranges for it
to be deleted from within a cleanup script bound to the
<code><b><Destroy></b></code> event. This cleanup script is
associated with a binding tag called <code><b>WcbCleanup</b></code>,
which is appended to the list of binding tags of the widget the first
time when registering some callbacks for it. (In the case of a
BWidget Entry, tablelist, or ctext widget, this script also deletes the
proxy command <code>::_<i>widgetName</i></code>.)</li>
<li class="tm">The cleanup script mentioned above also unregisters all
callbacks defined for <code><i>widgetName</i></code>, thus ensuring
that a widget with the same path created later will not inherit them
from the widget just deleted (this can be important in some
applications). For this reason, you should be careful not to
remove <code><b>WcbCleanup</b></code> from the list of binding tags of
the given widget!</li>
</ol>
</dd>
<dt class="tm"><b>KEYWORDS</b></dt>
<dd>callback, widget, Tk entry, Ttk entry, BWidget Entry, Tk spinbox, Ttk
spinbox, Ttk combobox, listbox, tablelist, Ttk treeview, text, ctext</dd>
</dl>
<div align="center">
<p><a href="#contents">Contents</a> <a href=
"index.html">Start page</a></p>
</div>
<hr>
<h2 id="cbappend">The <code><b>wcb::cbappend</b></code> Command</h2>
<dl>
<dt><b>NAME</b></dt>
<dd><code>wcb::cbappend</code> – Append to a callback list</dd>
<dt class="tm"><b>SYNOPSIS</b></dt>
<dd>
<pre>
<b>wcb::cbappend</b> <i>widgetName</i> <b>before</b>|<b>after</b> <i>option</i> ?<i>callback</i> <i>callback</i> ...?
</pre>
</dd>
<dt><b>DESCRIPTION</b></dt>
<dd>This command is almost identical to <code><b><a href=
"#callback">wcb::callback</a></b></code>. The only difference is that
<code><b>wcb::cbappend</b></code> <i>appends</i> the arguments specified
after the <code><i>option</i></code> parameter to the current callback list
(if present), while <code><b>wcb::callback</b></code> <i>replaces</i> the
old callbacks with these arguments.</dd>
<dt class="tm"><b>KEYWORDS</b></dt>
<dd>callback, append, widget</dd>
</dl>
<div align="center">
<p><a href="#contents">Contents</a> <a href=
"index.html">Start page</a></p>
</div>
<hr>
<h2 id="cbprepend">The <code><b>wcb::cbprepend</b></code> Command</h2>
<dl>
<dt><b>NAME</b></dt>
<dd><code>wcb::cbprepend</code> – Prepend to a callback list</dd>
<dt class="tm"><b>SYNOPSIS</b></dt>
<dd>
<pre>
<b>wcb::cbprepend</b> <i>widgetName</i> <b>before</b>|<b>after</b> <i>option</i> ?<i>callback</i> <i>callback</i> ...?
</pre>
</dd>
<dt><b>DESCRIPTION</b></dt>
<dd>This command is almost identical to <code><b><a href=
"#callback">wcb::callback</a></b></code>. The only difference is that
<code><b>wcb::cbprepend</b></code> <i>prepends</i> the arguments specified
after the <code><i>option</i></code> parameter to the current callback list
(if present), while <code><b>wcb::callback</b></code> <i>replaces</i> the
old callbacks with these arguments.</dd>
<dt class="tm"><b>KEYWORDS</b></dt>
<dd>callback, prepend, widget</dd>
</dl>
<div align="center">
<p><a href="#contents">Contents</a> <a href=
"index.html">Start page</a></p>
</div>
<hr>
<h2 id="cancel">The <code><b>wcb::cancel</b></code> Command</h2>
<dl>
<dt><b>NAME</b></dt>
<dd><code>wcb::cancel</code> – Cancel a widget command</dd>
<dt class="tm"><b>SYNOPSIS</b></dt>
<dd>
<pre>
<b>wcb::cancel</b> ?<i>script</i>?
</pre>
</dd>
<dt><b>DESCRIPTION</b></dt>
<dd>This procedure is designed to be invoked from a before-callback for a
widget command. It cancels the execution of that command and of the
remaining callbacks, and evaluates the <code><i>script</i></code> argument
in the global scope. If this argument is not specified, it defaults
to the <code><b>bell</b></code> command.</dd>
<dd class="tm">The return value is the one obtained from
<code><i>script</i></code> if this argument is specified and
nonempty. Otherwise, the command returns an empty string.</dd>
<dt class="tm"><b>KEYWORDS</b></dt>
<dd>cancel, command, widget</dd>
</dl>
<div align="center">
<p><a href="#contents">Contents</a> <a href=
"index.html">Start page</a></p>
</div>
<hr>
<h2 id="canceled">The <code><b>wcb::canceled</b></code> Command</h2>
<dl>
<dt><b>NAME</b></dt>
<dd><code>wcb::canceled</code> – Query the canceled status of a
widget command</dd>
<dt class="tm"><b>SYNOPSIS</b></dt>
<dd>
<pre>
<b>wcb::canceled</b> <i>widgetName</i> <i>option</i>
</pre>
</dd>
<dt><b>DESCRIPTION</b></dt>
<dd>Returns the value <code>1</code> if the most recent invocation of the
widget operation corresponding to <code><i>widgetName</i></code> and
<code><i>option</i></code> has been aborted by some before-callback by
invoking <code><b><a href="#cancel">wcb::cancel</a></b></code>; otherwise,
the return value is <code>0</code>. The arguments must fulfil the
same restrictions as in the case of the <code><b><a href=
"#callback">wcb::callback</a></b></code> command.</dd>
<dt class="tm"><b>KEYWORDS</b></dt>
<dd>cancel, command, widget</dd>
</dl>
<div align="center">
<p><a href="#contents">Contents</a> <a href=
"index.html">Start page</a></p>
</div>
<hr>
<h2 id="extend">The <code><b>wcb::extend</b></code> Command</h2>
<dl>
<dt><b>NAME</b></dt>
<dd><code>wcb::extend</code> – Extend the argument list of a widget
command</dd>
<dt class="tm"><b>SYNOPSIS</b></dt>
<dd>
<pre>
<b>wcb::extend</b> ?<i>arg</i> <i>arg</i> ...?
</pre>
</dd>
<dt><b>DESCRIPTION</b></dt>
<dd>This procedure is designed to be invoked from a before-callback for a
widget command. It appends the values given in the optional
<code><i>arg</i></code> parameters to the argument list of that
command. The new argument list will be passed to the remaining
callbacks for that command, too.</dd>
<dd class="tm">This procedure simply passes its parameters to the
<code><b>lappend</b></code> command, called for the argument list of the
respective widget operation.</dd>
<dt class="tm"><b>KEYWORDS</b></dt>
<dd>extend, argument, command, widget</dd>
</dl>
<div align="center">
<p><a href="#contents">Contents</a> <a href=
"index.html">Start page</a></p>
</div>
<hr>
<h2 id="replace">The <code><b>wcb::replace</b></code> Command</h2>
<dl>
<dt><b>NAME</b></dt>
<dd><code>wcb::replace</code> – Replace arguments of a widget command
with new ones</dd>
<dt class="tm"><b>SYNOPSIS</b></dt>
<dd>
<pre>
<b>wcb::replace</b> <i>first</i> <i>last</i> ?<i>arg</i> <i>arg</i> ...?
</pre>
</dd>
<dt><b>DESCRIPTION</b></dt>
<dd>This procedure is designed to be invoked from a before-callback for a
widget command. It replaces the arguments having the indices
<code><i>first</i></code> through <code><i>last</i></code> of that command
with the optional <code><i>arg</i></code> parameters. The new
argument list will be passed to the remaining callbacks for that command,
too. The arguments are numbered from <code>0</code> (see the <a href=
"#callback_table">table</a> in the description of the <code><b><a href=
"#callback">wcb::callback</a></b></code> command).</dd>
<dd class="tm">This procedure simply passes its parameters to the
<code><b>lreplace</b></code> command, called for the argument list of the
respective widget operation.</dd>
<dt class="tm"><b>KEYWORDS</b></dt>
<dd>replace, argument, command, widget</dd>
</dl>
<div align="center">
<p><a href="#contents">Contents</a> <a href=
"index.html">Start page</a></p>
</div>
<hr>
<h2 id="pathname">The <code><b>wcb::pathname</b></code> Command</h2>
<dl>
<dt><b>NAME</b></dt>
<dd><code>wcb::pathname</code> – Query the path name of the widget
corresponding to a Tcl command name</dd>
<dt class="tm"><b>SYNOPSIS</b></dt>
<dd>
<pre>
<b>wcb::pathname</b> <i>proxyCmd</i>
</pre>
</dd>
<dt><b>DESCRIPTION</b></dt>
<dd>This procedure returns the path name of the widget corresponding to the
Tcl command name <code><i>proxyCmd</i></code> passed to a callback.</dd>
<dd class="tm">When a before- or after-callback for a widget is invoked,
the name of the proxy command associated with that widget is automatically
appended to it as parameter. This procedure can be used within a
callback to retrieve the path name of the widget from the command name
passed to the callback as argument. It simply returns the string
range obtained from <code><i>proxyCmd</i></code> by removing the
<code>"::_"</code> prefix.</dd>
<dt class="tm"><b>KEYWORDS</b></dt>
<dd>path name, command, widget</dd>
</dl>
<div align="center">
<p><a href="#contents">Contents</a> <a href=
"index.html">Start page</a></p>
</div>
<hr>
<h2 id="changeEntryText">The <code><b>wcb::changeEntryText</b></code>
Command</h2>
<dl>
<dt><b>NAME</b></dt>
<dd><code>wcb::changeEntryText</code> – Change the text of a Tk or
Ttk entry, BWidget Entry, Tk or Ttk spinbox, or Ttk combobox widget</dd>
<dt class="tm"><b>SYNOPSIS</b></dt>
<dd>
<pre>
<b>wcb::changeEntryText</b> <i>widgetName string</i>
</pre>
</dd>
<dt><b>DESCRIPTION</b></dt>
<dd>Replaces the text of the Tk or Ttk entry, BWidget Entry, Tk or Ttk
spinbox, or Ttk combobox widget <code><i>widgetName</i></code> with
<code><i>string</i></code>, by using the <code><b>delete</b></code> and
<code><b>insert</b></code> operations. If the first subcommand is
canceled by some before-<code><b>delete</b></code> callback then the
procedure returns without inserting the new text; if the second operation
is canceled by some before-<code><b>insert</b></code> callback then the
command restores the original contents of the widget.</dd>
<dd class="tm">The procedure keeps the position of the insertion
cursor. The return value is <code>1</code> on success and
<code>0</code> on failure, i.e., if one of the attempted operations was
canceled by some before-callback.</dd>
<dt class="tm"><b>KEYWORDS</b></dt>
<dd>Tk entry, Ttk entry, BWidget Entry, Tk spinbox, Ttk spinbox, Ttk
combobox, widget</dd>
</dl>
<div align="center">
<p><a href="#contents">Contents</a> <a href=
"index.html">Start page</a></p>
</div>
<hr>
<h2 id="postInsertEntryLen">The <code><b>wcb::postInsertEntryLen</b></code>
Command</h2>
<dl>
<dt><b>NAME</b></dt>
<dd><code>wcb::postInsertEntryLen</code> – Query the would-be length
of the text in a Tk or Ttk entry, BWidget Entry, Tk or Ttk spinbox, or Ttk
combobox widget after text insertion</dd>
<dt class="tm"><b>SYNOPSIS</b></dt>
<dd>
<pre>
<b>wcb::postInsertEntryLen</b> <i>widgetName string</i>
</pre>
</dd>
<dt><b>DESCRIPTION</b></dt>
<dd>Returns the length of the text that would be contained in the Tk or Ttk
entry, BWidget Entry, Tk or Ttk spinbox, or Ttk combobox widget
<code><i>widgetName</i></code> after inserting
<code><i>string</i></code>.</dd>
<dt class="tm"><b>KEYWORDS</b></dt>
<dd>insert, Tk entry, Ttk entry, BWidget Entry, Tk spinbox, Ttk spinbox,
Ttk combobox, widget</dd>
</dl>
<div align="center">
<p><a href="#contents">Contents</a> <a href=
"index.html">Start page</a></p>
</div>
<hr>
<h2 id="postInsertEntryText">The <code><b>wcb::postInsertEntryText</b></code>
Command</h2>
<dl>
<dt><b>NAME</b></dt>
<dd><code>wcb::postInsertEntryText</code> – Query the would-be text
of a Tk or Ttk entry, BWidget Entry, Tk or Ttk spinbox, or Ttk combobox
widget after text insertion</dd>
<dt class="tm"><b>SYNOPSIS</b></dt>
<dd>
<pre>
<b>wcb::postInsertEntryText</b> <i>widgetName index string</i>
</pre>
</dd>
<dt><b>DESCRIPTION</b></dt>
<dd>Returns the text that would be contained in the Tk or Ttk entry,
BWidget Entry, Tk or Ttk spinbox, or Ttk combobox widget
<code><i>widgetName</i></code> after inserting <code><i>string</i></code>
before the character indicated by <code><i>index</i></code>.</dd>
<dt class="tm"><b>KEYWORDS</b></dt>
<dd>insert, Tk entry, Ttk entry, BWidget Entry, Tk spinbox, Ttk spinbox,
Ttk combobox, widget</dd>
</dl>
<div align="center">
<p><a href="#contents">Contents</a> <a href=
"index.html">Start page</a></p>
</div>
<hr>
<h2 id="postDeleteEntryText">The <code><b>wcb::postDeleteEntryText</b></code>
Command</h2>
<dl>
<dt><b>NAME</b></dt>
<dd><code>wcb::postDeleteEntryText</code> – Query the would-be text
of a Tk or Ttk entry, BWidget Entry, Tk or Ttk spinbox, or Ttk combobox
widget after text deletion</dd>
<dt class="tm"><b>SYNOPSIS</b></dt>
<dd>
<pre>
<b>wcb::postDeleteEntryText</b> <i>widgetName from</i> ?<i>to</i>?
</pre>
</dd>
<dt><b>DESCRIPTION</b></dt>
<dd>Returns the text that would be contained in the Tk or Ttk entry,
BWidget Entry, Tk or Ttk spinbox, or Ttk combobox widget
<code><i>widgetName</i></code> after deleting the characters starting with
the one indicated by the index <code><i>from</i></code> and stopping just
before <code><i>to</i></code>. If <code><i>to</i></code> is not
specified then the return value is the text that would be contained in the
widget after deleting the single character given by
<code><i>from</i></code>.</dd>
<dd class="tm"><b>REMARK:</b> This command has a variable number (2
or 3) of arguments, because the <code><b>delete</b></code> subcommand of
the Tcl command associated with <code><i>widgetName</i></code> expects
either one or two indices as arguments. For this reason, the correct
way to invoke this command from within a before-<code><b>delete</b></code>
callback is as shown in the following example:</dd>
<dd>
<blockquote>
<pre>
proc myBeforeDeleteCallback {w args} {
<span class="cmt">#
# Get the text that would be contained in the widget after
# deleting the characters specified by $args, which stands
# for the one or two arguments passed to delete; pass these
# arguments to wcb::postDeleteEntryText by expanding $args
#</span>
set newText [eval [list wcb::postDeleteEntryText $w] $args]
if {!<i>some_condition_on_</i>$newText} {
wcb::cancel
}
}
</pre>
</blockquote>
</dd>
<dd>The following alternative, more elegant solution requires Tcl/Tk 8.5 or
later:</dd>
<dd>
<blockquote>
<pre>
proc myBeforeDeleteCallback {w args} {
<span class="cmt"># . . .</span>
set newText [wcb::postDeleteEntryText $w {*}$args]
. . .
}
</pre>
</blockquote>
</dd>
<dt><b>KEYWORDS</b></dt>
<dd>delete, Tk entry, Ttk entry, BWidget Entry, Tk spinbox, Ttk spinbox,
Ttk combobox, widget</dd>
</dl>
<div align="center">
<p><a href="#contents">Contents</a> <a href=
"index.html">Start page</a></p>
</div>
<hr>
<h2 id="entrycb">Before-<code><b>insert</b></code> Callbacks for entry,
spinbox, and combobox Widgets</h2>
<dl>
<dt><b>NAME</b></dt>
<dd><code>wcb::checkStrFor*</code>, <code>wcb::convStrTo*</code>,
<code>wcb::checkEntryFor*</code>, <code>wcb::checkEntryLen</code> –
Before-<code><b>insert</b></code> callbacks for Tk entry, Ttk entry,
BWidget Entry, Tk spinbox, Ttk spinbox, and Ttk combobox widgets</dd>
<dt class="tm"><b>SYNOPSIS</b></dt>
<dd>
<pre>
<b>wcb::checkStrForRegExp</b> <i>exp w idx str</i>
<b>wcb::checkStrForAlpha</b> <i> w idx str</i>
<b>wcb::checkStrForNum</b> <i> w idx str</i>
<b>wcb::checkStrForAlnum</b> <i> w idx str</i>
<b>wcb::convStrToUpper</b> <i> w idx str</i>
<b>wcb::convStrToLower</b> <i> w idx str</i>
<b>wcb::checkEntryForInt</b> <i> w idx str</i>
<b>wcb::checkEntryForUInt</b> <i>max w idx str</i>
<b>wcb::checkEntryForReal</b> <i> w idx str</i>
<b>wcb::checkEntryForFixed</b> <i>cnt w idx str</i>
<b>wcb::checkEntryLen</b> <i>len w idx str</i>
</pre>
</dd>
<dt class="tm"><b>DESCRIPTION</b></dt>
<dd>The <code><b>wcb::checkStrForRegExp</b></code> callback checks whether
the string <code><i>str</i></code> to be inserted into the Tk or Ttk entry,
BWidget Entry, Tk or Ttk spinbox, or Ttk combobox widget
<code><i>w</i></code> is matched by the regular expression
<code><i>exp</i></code>; if not, it cancels the <code><b>insert</b></code>
operation.</dd>
<dd class="tm">The three other <code><b>wcb::checkStrFor*</b></code>
callbacks check whether the string <code><i>str</i></code> to be inserted
into the Tk or Ttk entry, BWidget Entry, Tk or Ttk spinbox, or Ttk
combobox widget <code><i>w</i></code> is alphabetic, numeric, or
alphanumeric, respectively; if not, they cancel the
<code><b>insert</b></code> operation. These procedures just invoke
the callback <code><b>wcb::checkStrForRegExp</b></code>, passing to it the
Unicode-based patterns <code>{^[[:alpha:]]*$}</code>,
<code>{^[[:digit:]]*$}</code>, and <code>{^[[:alnum:]]*$}</code>.</dd>
<dd class="tm">The <code><b>wcb::convStrTo*</b></code> callbacks replace
the string <code><i>str</i></code> to be inserted into the Tk or Ttk entry,
BWidget Entry, Tk or Ttk spinbox, or Ttk combobox widget
<code><i>w</i></code> with its uppercase or lowercase equivalent,
respectively.</dd>
<dd class="tm">The <code><b>wcb::checkEntryFor*</b></code> callbacks check
whether the text contained in the Tk or Ttk entry, BWidget Entry, Tk or Ttk
spinbox, or Ttk combobox widget <code><i>w</i></code> after inserting
the string <code><i>str</i></code> before the character indicated by the
index <code><i>idx</i></code> would represent (the starting part of) an
integer number, unsigned integer no greater than <code><i>max</i></code>,
real number, or real number in fixed-point format with at most
<code><i>cnt</i></code> digits after the decimal point, respectively; if
not, they cancel the <code><b>insert</b></code> operation.
<code><i>max</i></code> and <code><i>cnt</i></code> should be nonnegative
numbers or <code><b>*</b></code>; <code><i>max</i> =
<b>*</b></code> means: no upper bound for the Tk or Ttk entry,
BWidget Entry, Tk or Ttk spinbox, or Ttk combobox value, while
<code><i>cnt</i> = <b>*</b></code> stands for an unlimited number of
digits after the decimal point.</dd>
<dd class="tm">The <code><b>wcb::checkEntryLen</b></code> callback checks
whether the length of the text contained in the Tk or Ttk entry, BWidget
Entry, Tk or Ttk spinbox, or Ttk combobox widget <code><i>w</i></code>
after inserting the string <code><i>str</i></code> would be greater than
<code><i>len</i></code>; if yes, it cancels the <code><b>insert</b></code>
operation.</dd>
<dd class="tm">These callback procedures are implemented in the file
<code><b>wcbEntry.tcl</b></code>, contained in the
<code><b>scripts</b></code> directory. They return an empty
string.</dd>
<dt class="tm"><b>KEYWORDS</b></dt>
<dd>callback, insert, Tk entry, Ttk entry, BWidget Entry, Tk spinbox, Ttk
spinbox, Ttk combobox, widget</dd>
</dl>
<div align="center">
<p><a href="#contents">Contents</a> <a href=
"index.html">Start page</a></p>
</div>
<hr>
<h2 id="textcb">Before-<code><b>insert</b></code> Callbacks for text and
ctext Widgets</h2>
<dl>
<dt><b>NAME</b></dt>
<dd><code>wcb::checkStrsFor*</code>, <code>wcb::convStrsTo*</code> –
Before-<code><b>insert</b></code> callbacks for text and ctext widgets</dd>
<dt class="tm"><b>SYNOPSIS</b></dt>
<dd>
<pre>
<b>wcb::checkStrsForRegExp</b> <i>exp w idx args</i>
<b>wcb::checkStrsForAlpha</b> <i> w idx args</i>
<b>wcb::checkStrsForNum</b> <i> w idx args</i>
<b>wcb::checkStrsForAlnum</b> <i> w idx args</i>
<b>wcb::convStrsToUpper</b> <i> w idx args</i>
<b>wcb::convStrsToLower</b> <i> w idx args</i>
</pre>
</dd>
<dt class="tm"><b>DESCRIPTION</b></dt>
<dd>The <code><b>wcb::checkStrsForRegExp</b></code> callback checks whether
the strings to be inserted into the text or ctext widget
<code><i>w</i></code>, contained in the list <code><i>args</i></code> of
the form <code><i>string</i> ?<i>tagList</i> <i>string</i>
<i>tagList</i> ...?</code>, are matched by the regular expression
<code><i>exp</i></code>; if not, it cancels the <code><b>insert</b></code>
operation.</dd>
<dd class="tm">The three other <code><b>wcb::checkStrsFor*</b></code>
callbacks check whether the strings to be inserted into the text or ctext
widget <code><i>w</i></code>, contained in the list
<code><i>args</i></code> of the form <code><i>string</i>
?<i>tagList</i> <i>string</i> <i>tagList</i> ...?</code>, are
alphabetic, numeric, or alphanumeric, respectively; if not, they cancel the
<code><b>insert</b></code> operation. These procedures just invoke
the callback <code><b>wcb::checkStrsForRegExp</b></code>, passing to it the
Unicode-based patterns <code>{^[[:alpha:]\n]*$}</code>,
<code>{^[[:digit:]\n]*$}</code>, and <code>{^[[:alnum:]\n]*$}</code>.</dd>
<dd class="tm">The <code><b>wcb::convStrsTo*</b></code> callbacks replace
the strings to be inserted into the text or ctext widget
<code><i>w</i></code>, contained in the list <code><i>args</i></code> of
the form <code><i>string</i> ?<i>tagList</i> <i>string</i>
<i>tagList</i> ...?</code>, with their uppercase or lowercase
equivalents, respectively.</dd>
<dd class="tm">These callback procedures are implemented in the file
<code><b>wcbText.tcl</b></code>, contained in the
<code><b>scripts</b></code> directory. They return an empty
string.</dd>
<dt class="tm"><b>KEYWORDS</b></dt>
<dd>callback, insert, text, ctext, widget</dd>
</dl>
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