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<HTML><HEAD><TITLE>ComboBox</TITLE></HEAD><BODY BGCOLOR=white><DL><DT><I><A HREF="#descr">NAME</A></I></DT><DD><B>ComboBox</B> - ComboBox widget</DD></DL><DL><DT><I>CREATION</I></DT><DD><A HREF="#descr"><B>ComboBox</B></A> <I>pathName</I> ?<I>option value...</I>?</DD></DL><DL><DT><I><A HREF="ArrowButton.html">OPTIONS from <B>ArrowButton</B></A></I></DT><DD><TABLE CELLSPACING=0 CELLPADDING=0 BORDER=0><TR><TD> -background or -bg</TD><TD> -disabledforeground</TD></TR><TR><TD> -foreground or -fg</TD><TD> -state</TD></TR></TABLE></DD></DL><DL><DT><I><A HREF="Entry.html">OPTIONS from <B>Entry</B></A></I></DT><DD><TABLE CELLSPACING=0 CELLPADDING=0 BORDER=0><TR><TD> -command</TD><TD> -disabledforeground</TD></TR><TR><TD> -dragenabled</TD><TD> -dragendcmd</TD></TR><TR><TD> -dragevent</TD><TD> -draginitcmd</TD></TR><TR><TD> -dragtype</TD><TD> -dropcmd</TD></TR><TR><TD> -dropenabled</TD><TD> -dropovercmd</TD></TR><TR><TD> -droptypes</TD><TD> -editable</TD></TR><TR><TD> -entrybg (see <B>-background</B>)</TD><TD> -entryfg (see <B>-foreground</B>)</TD></TR><TR><TD> -exportselection</TD><TD> -font</TD></TR><TR><TD> -helptext</TD><TD> -helptype</TD></TR><TR><TD> -helpvar</TD><TD> -highlightbackground</TD></TR><TR><TD> -highlightcolor</TD><TD> -highlightthickness</TD></TR><TR><TD> -insertbackground</TD><TD> -insertborderwidth</TD></TR><TR><TD> -insertofftime</TD><TD> -insertontime</TD></TR><TR><TD> -insertwidth</TD><TD> -justify</TD></TR><TR><TD> -selectbackground</TD><TD> -selectborderwidth</TD></TR><TR><TD> -selectforeground</TD><TD> -show</TD></TR><TR><TD> -state</TD><TD> -takefocus</TD></TR><TR><TD> -text</TD><TD> -textvariable</TD></TR><TR><TD> -width</TD><TD> -xscrollcommand</TD></TR></TABLE></DD></DL><DL><DT><I><A HREF="#wso">WIDGET-SPECIFIC OPTIONS</A></I></DT><DD><TABLE CELLSPACING=0 CELLSPACING=0 BORDER=0><TR><TD> <A HREF="#-height">-height</A></TR><TD> <A HREF="#-modifycmd">-modifycmd</A></TR></TR><TR><TD> <A HREF="#-postcommand">-postcommand</A></TR><TD> <A HREF="#-values">-values</A></TR></TR></TABLE></DD></DL><DL><DT><I><A HREF="#wc">WIDGET COMMAND</A></I></DT><DD><I>pathName</I> <A HREF="#bind"><B>bind</B></A> ?<I>arg...</I>?</DD><DD><I>pathName</I> <A HREF="#cget"><B>cget</B></A> <I>option</I></DD><DD><I>pathName</I> <A HREF="#configure"><B>configure</B></A> ?<I>option</I>? ?<I>value</I> <I>option</I> <I>value</I> ...?</DD><DD><I>pathName</I> <A HREF="#getvalue"><B>getvalue</B></A></DD><DD><I>pathName</I> <A HREF="#setvalue"><B>setvalue</B></A> <I>index</I></DD></DL><BR><HR WIDTH="100%"><BR><B><A NAME="descr"></A>DESCRIPTION</B><BR><P>ComboBox widget enables the user to select a value among a list given bythe <B>values</B> option. The list of possible values can be popped bypressing the ArrowButton or by clicking in the entry when <B>editable</B>value of the ComboBox is <B>false</B>.<BR> If <B>editable</B> value of theComboBox is <B>true</B> and the entry has the focus, the user can press thetop and bottom arrow keys to modify its value. If the current value exactlymatch a value in the list, then the previous (for top arrow key) or thennext (for bottom arrow key) value in the list is displayed. If the currentvalue match the beginning of a value in the list, then this value isdisplayed. If the current value doesnt match anything, then the firstvalue is displayed.</P><BR><HR WIDTH="50%"><BR><B><A NAME="wso">WIDGET-SPECIFIC OPTIONS</A></B><BR><DL><DT><A NAME="-height"><B>-height</B></A></DT><DD>Specifies the desired height for the window, in lines. If zero or less,then the desired height for the window is made just large enough to holdall the elements in the listbox.</DD></DL><DL><DT><A NAME="-modifycmd"><B>-modifycmd</B></A></DT><DD>Specifies a Tcl command called when the user modify the value of the ComboBox by selecting it in the listbox or pressing arrow key.</DD></DL><DL><DT><A NAME="-postcommand"><B>-postcommand</B></A></DT><DD>Specifies a Tcl command called before the listbox of the ComboBox is mapped.</DD></DL><DL><DT><A NAME="-values"><B>-values</B></A></DT><DD>Specifies the values to display in the listbox of the ComboBox.</DD></DL><HR WIDTH="50%"><BR><B><A NAME="wc">WIDGET COMMAND</A></B><BR><DL><DT><A NAME="bind"><I>pathName</I> <B>bind</B></A> ?<I>arg...</I>?</DT><DD>Set bindings on the entry widget.</DD></DL><DL><DT><A NAME="cget"><I>pathName</I> <B>cget</B></A> <I>option</I></DT><DD>Returns the current value of the configuration option given by <I>option</I>.<I>Option</I> may have any of the values accepted by the creation command.</DD></DL><DL><DT><A NAME="configure"><I>pathName</I> <B>configure</B></A> ?<I>option</I>? ?<I>value</I> <I>option</I> <I>value</I> ...?</DT><DD>Query or modify the configuration options of the widget. If no<I>option</I> is specified, returns a list describing all of the availableoptions for <I>pathName</I>. If <I>option</I> is specified with no<I>value</I>, then the command returns a list describing the one named<I>option</I> (this list will be identical to the corresponding sublist ofthe value returned if no <I>option</I> is specified). If one or more<I>option-value</I> pairs are specified, then the command modifies thegiven widget option(s) to have the given value(s); in this case the commandreturns an empty string. <I>Option</I> may have any of the values acceptedby the creation command. Read-only options are not be modified.</DD></DL><DL><DT><A NAME="getvalue"><I>pathName</I> <B>getvalue</B></A></DT><DD>Returns the index of the current text of the ComboBox in the list of values,or -1 if it doesn't match any value.</DD></DL><DL><DT><A NAME="setvalue"><I>pathName</I> <B>setvalue</B></A> <I>index</I></DT><DD>Set the text of the ComboBox to the value indicated by <I>index</I> in the list of values.<I>index</I> may be specified in any of the following forms:<P><DL COMPACT><DT><B>last</B><DD>Specifies the last element of the list of values.<DT><B>first</B><DD>Specifies the first element of the list of values.<DT><B>next</B><DD>Specifies the element following the current (ie returned by <B>getvalue</B>) in the listof values.<DT><B>previous</B><DD>Specifies the element preceding the current (ie returned by <B>getvalue</B>) in the listof values.<DT>@<I>number</I><DD>Specifies the integer index in the list of values.</DL></DD></DL><HR><BR><B>BINDINGS</B><BR><BR>When Entry of the ComboBox has the input focus, it has the following bindings, in additionto the default Entry bindings:<UL><LI>Page up set the value of the ComboBox to the first value.<LI>Page down set the value of the ComboBox to the last value.<LI>Arrow up set the value of the ComboBox to the previous value.<LI>Arrow down set the value of the ComboBox to the next value.</UL>If the listbox is not mapped and ComboBox is not editable or disabled,mouse button 1 on the Entry cause the listbox to popup, as if the user press the ArrowButton.</BODY></HTML>⌨️ 快捷键说明
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