289 lines
14 KiB
HTML
289 lines
14 KiB
HTML
<HTML><HEAD><TITLE>Tk Built-In Commands - checkbutton manual page</TITLE></HEAD>
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<BODY bgcolor = #c3c3ff>
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<H2><IMG ALIGN=BOTTOM SRC="./Img/ManPageBlue.gif"> checkbutton</H2>
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<I>Create and manipulate checkbutton widgets</I><P><IMG ALIGN=TOP SRC="./Img/line-red.gif">
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<H3><A NAME="M2">SYNOPSIS</A></H3>
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(<B>checkbutton</B><I> widget-name </I>?<I>options</I>?)<BR>
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<H3><A NAME="M3">STANDARD OPTIONS</A></H3>
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<PRE>
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<B><A HREF="options.n.html#M:activebackground">:activebackground</A></B> <B><A HREF="options.n.html#M:activeforeground">:activeforeground</A></B>
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<B><A HREF="options.n.html#M:anchor">:anchor</A></B> <B><A HREF="options.n.html#M:background">:background</A></B>
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<B><A HREF="options.n.html#M:bitmap">:bitmap</A></B> <B><A HREF="options.n.html#M:borderwidth">:borderwidth</A></B>
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<B><A HREF="options.n.html#M:cursor">:cursor</A></B> <B><A HREF="options.n.html#M:disabledforeground">:disabledforeground</A></B>
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<B><A HREF="options.n.html#M:font">:font</A></B> <B><A HREF="options.n.html#M:foreground">:foreground</A></B>
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<B><A HREF="options.n.html#M:highlightbackground">:highlightbackground</A></B> <B><A HREF="options.n.html#M:highlightcolor">:highlightcolor</A></B>
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<B><A HREF="options.n.html#M:highlightthickness">:highlightthickness</A></B> <B><A HREF="options.n.html#M:image">:image</A></B>
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<B><A HREF="options.n.html#M:justify">:justify</A></B> <B><A HREF="options.n.html#M:padx">:padx</A></B>
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<B><A HREF="options.n.html#M:pady">:pady</A></B> <B><A HREF="options.n.html#M:relief">:relief</A></B>
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<B><A HREF="options.n.html#M:takefocus">:takefocus</A></B> <B><A HREF="options.n.html#M:text">:text</A></B>
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<B><A HREF="options.n.html#M:textvariable">:textvariable</A></B> <B><A HREF="options.n.html#M:underline">:underline</A></B>
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<B><A HREF="options.n.html#M:wraplength">:wraplength</A></B>
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</PRE>
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<H3><A NAME="M27">WIDGET-SPECIFIC OPTIONS</A></H3>
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<DL>
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<P>
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<DT><I>Name</I>: <B>command</B>
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<DT><I>Class</I>: <B>Command</B>
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<DT><I>Option keyword</I>: <B><A NAME="M28">:command</A></B>
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<DT><I>STklos slot name</I>: <B>command</B>
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<DD>Specifies a STk procedure to associate with the button. This procedure
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is typically invoked when mouse button 1 is released over the button
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window. The button's global variable (<B>:variable</B> option) will
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be updated before the procedure is invoked.
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<P>
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<P>
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<DT><I>Name</I>: <B>height</B>
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<DT><I>Class</I>: <B>Height</B>
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<DT><I>Option keyword</I>: <B><A NAME="M29">:height</A></B>
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<DT><I>STklos slot name</I>: <B>height</B>
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<DD>Specifies a desired height for the button.
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If an image or bitmap is being displayed in the button then the value is in
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screen units (i.e. any of the forms acceptable to <B>Tk_GetPixels</B>);
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for text it is in lines of text.
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If this option isn't specified, the button's desired height is computed
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from the size of the image or bitmap or text being displayed in it.
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<P>
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<P>
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<DT><I>Name</I>: <B>indicatorOn</B>
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<DT><I>Class</I>: <B>IndicatorOn</B>
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<DT><I>Option keyword</I>: <B><A NAME="M30">:indicatoron</A></B>
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<DT><I>STklos slot name</I>: <B>indicator-on</B>
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<DD>Specifies whether or not the indicator should be drawn. Must be a
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proper boolean value. If false, the <B>relief</B> option is
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ignored and the widget's relief is always sunken if the widget is
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selected and raised otherwise.
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<P>
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<P>
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<DT><I>Name</I>: <B>offValue</B>
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<DT><I>Class</I>: <B>Value</B>
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<DT><I>Option keyword</I>: <B><A NAME="M31">:offvalue</A></B>
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<DT><I>STklos slot name</I>: <B>off-value</B>
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<DD>Specifies value to store in the button's associated variable whenever
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this button is deselected. Defaults to <B>#f</B>.
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<P>
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<P>
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<DT><I>Name</I>: <B>onValue</B>
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<DT><I>Class</I>: <B>Value</B>
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<DT><I>Option keyword</I>: <B><A NAME="M32">:onvalue</A></B>
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<DT><I>STklos slot name</I>: <B>on-value</B>
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<DD>Specifies value to store in the button's associated variable whenever
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this button is selected. Defaults to <B>#t</B>.
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<P>
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<P>
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<DT><I>Name</I>: <B>selectColor</B>
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<DT><I>Class</I>: <B>Background</B>
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<DT><I>Option keyword</I>: <B><A NAME="M33">:selectcolor</A></B>
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<DT><I>STklos slot name</I>: <B>select-color</B>
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<DD>Specifies a background color to use when the button is selected.
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If <B>indicatorOn</B> is true then the color applicies to the indicator.
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If <B>indicatorOn</B> is false, this color is used as the background
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for the entire widget, in place of <B>background</B> or <B>activeBackground</B>,
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whenever the widget is selected.
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If specified as an empty string then no special color is used for
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displaying when the widget is selected.
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<P>
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<P>
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<DT><I>Name</I>: <B>selectImage</B>
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<DT><I>Class</I>: <B>SelectImage</B>
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<DT><I>Option keyword</I>: <B><A NAME="M34">:selectimage</A></B>
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<DT><I>STklos slot name</I>: <B>select-image</B>
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<DD>Specifies an image to display (in place of the <B>image</B> option)
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when the checkbutton is selected.
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This option is ignored unless the <B>image</B> option has been
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specified.
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<P>
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<P>
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<DT><I>Name</I>: <B>state</B>
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<DT><I>Class</I>: <B>State</B>
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<DT><I>Option keyword</I>: <B><A NAME="M35">:state</A></B>
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<DT><I>STklos slot name</I>: <B>state</B>
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<DD>Specifies one of three states for the checkbutton: <B>normal</B>, <B>active</B>,
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or <B>disabled</B>. In normal state the checkbutton is displayed using the
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<B>foreground</B> and <B>background</B> options. The active state is
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typically used when the pointer is over the checkbutton. In active state
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the checkbutton is displayed using the <B>activeForeground</B> and
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<B>activeBackground</B> options. Disabled state means that the checkbutton
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should be insensitive: the default bindings will refuse to activate
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the widget and will ignore mouse button presses.
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In this state the <B>disabledForeground</B> and
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<B>background</B> options determine how the checkbutton is displayed.
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<P>
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<P>
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<DT><I>Name</I>: <B>stringvalue</B>
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<DT><I>Class</I>: <B>StringValue</B>
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<DT><I>Option keyword</I>: <B><A NAME="M36">:stringvalue</A></B>
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<DT><I>STklos slot name</I>: <B>string-value</B>
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<DD>Specifies if the value set to <B>variable</B> by <B>:offvalue</B> or
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<B>:onvalue</B> must be <I>stringified</I>. For instance, with
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<P>
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</DL>
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<UL>
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<PRE>(checkbutton '.c :text "Try" :variable 'x :stringvalue #t
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:onvalue 10 :offvalue 20)</PRE>
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the variabe <B>x</B> var is set to <I>"10"</I> or <I>"20"</I>, whereas
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with
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<PRE>(checkbutton '.c :text "Try" :variable 'x :stringvalue #f
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:onvalue 10 :offvalue 20)</PRE>
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it is set to 10 or 20. Default value for <B>:stringvalue</B> is <B>#t</B>.
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</UL>
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<DL>
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<P>
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<DT><I>Name</I>: <B>variable</B>
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<DT><I>Class</I>: <B>Variable</B>
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<DT><I>Option keyword</I>: <B><A NAME="M37">:variable</A></B>
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<DT><I>STklos slot name</I>: <B>variable</B>
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<DD>Specifies name of global variable to set to indicate whether
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or not this button is selected. Defaults to the name of the
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button within its parent (i.e. the last element of the button
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window's path name).
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<P>
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<P>
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<DT><I>Name</I>: <B>width</B>
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<DT><I>Class</I>: <B>Width</B>
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<DT><I>Option keyword</I>: <B><A NAME="M38">:width</A></B>
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<DT><I>STklos slot name</I>: <B>width</B>
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<DD>Specifies a desired width for the button.
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If an image or bitmap is being displayed in the button then the value is in
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screen units (i.e. any of the forms acceptable to <B>Tk_GetPixels</B>);
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for text it is in characters.
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If this option isn't specified, the button's desired width is computed
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from the size of the image or bitmap or text being displayed in it.
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<P>
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</DL>
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<H3><A NAME="M39">DESCRIPTION</A></H3>
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The <B>checkbutton</B> procedure creates a new window (given by the
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<I>widget-name</I> argument) and makes it into a checkbutton widget.
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Additional
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options, described above, may be specified on the procedure line
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or in the option database
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to configure aspects of the checkbutton such as its colors, font,
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text, and initial relief. The <B>checkbutton</B> procedure returns its
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<I>widget-name</I> argument. At the time this procedure is invoked,
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there must not exist a window named <I>widget-name</I>, but
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<I>widget-name</I>'s parent must exist.
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<P>
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A checkbutton is a widget
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that displays a textual string, bitmap or image
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and a square called an <I>indicator</I>.
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If text is displayed, it must all be in a single font, but it
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can occupy multiple lines on the screen (if it contains newlines
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or if wrapping occurs because of the <B>wrapLength</B> option) and
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one of the characters may optionally be underlined using the
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<B>underline</B> option.
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A checkbutton has
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all of the behavior of a simple button, including the
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following: it can display itself in either of three different
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ways, according to the <B>state</B> option;
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it can be made to appear
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raised, sunken, or flat; it can be made to flash; and it invokes
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a STk procedure whenever mouse button 1 is clicked over the
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checkbutton.
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<P>
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In addition, checkbuttons can be <I>selected</I>.
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If a checkbutton is selected then the indicator is normally
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drawn with a sunken relief and a special color, and
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a STk variable associated with the checkbutton is set to a particular
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value (normally 1).
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If the checkbutton is not selected, then the indicator is drawn with a
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raised relief and no special color, and the associated variable is
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set to a different value (typically 0).
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By default, the name of the variable associated with a checkbutton is the
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same as the <I>name</I> used to create the checkbutton.
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The variable name, and the ``on'' and ``off'' values stored in it,
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may be modified with options on the procedure line or in the option
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database.
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Configuration options may also be used to modify the way the
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indicator is displayed (or whether it is displayed at all).
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By default a checkbutton is configured to select and deselect
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itself on alternate button clicks.
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In addition, each checkbutton monitors its associated variable and
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automatically selects and deselects itself when the variables value
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changes to and from the button's ``on'' value.
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<H3><A NAME="M40">WIDGET PROCEDURE</A></H3>
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The <B>checkbutton</B> procedure creates a new STk procedure whose
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name is <I>widget-name</I>. This
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procedure may be used to invoke various
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operations on the widget. It has the following general form:
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<PRE>(<I>widget-name option </I>?<I>arg arg ...</I>?)</PRE>
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<I>Option</I> and the <I>arg</I>s
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determine the exact behavior of the procedure. The following
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procedures are possible for checkbutton widgets:
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<P>
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<DL>
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<DT><A NAME="M41">(<I>widget-name '</I><B>cget</B> <I>option</I>)</A><DD>
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Returns the current value of the configuration option given
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by <I>option</I>.
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<I>Option</I> may have any of the values accepted by the <B>checkbutton</B>
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procedure.
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<P>
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<DT><A NAME="M42">(<I>widget-name '</I><B>configure</B> ?<I>option</I>? ?<I>value option value ...</I>?)</A><DD>
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Query or modify the configuration options of the widget.
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If no <I>option</I> is specified, returns a list describing all of
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the available options for <I>widget-name</I> (see <B>Tk_ConfigureInfo</B> for
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information on the format of this list). If <I>option</I> is specified
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with no <I>value</I>, then the procedure returns a list describing the
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one named option (this list will be identical to the corresponding
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sublist of the value returned if no <I>option</I> is specified). If
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one or more <I>option-value</I> pairs are specified, then the procedure
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modifies the given widget option(s) to have the given value(s); in
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this case the procedure returns an empty list.
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<I>Option</I> may have any of the values accepted by the <B>checkbutton</B>
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procedure.
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<P>
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<DT><A NAME="M43">(<I>widget-name '</I><B>deselect</B>)</A><DD>
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Deselects the checkbutton and sets the associated variable to its ``off''
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value.
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<P>
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<DT><A NAME="M44">(<I>widget-name '</I><B>flash</B>)</A><DD>
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Flashes the checkbutton. This is accomplished by redisplaying the checkbutton
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several times, alternating between active and normal colors. At
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the end of the flash the checkbutton is left in the same normal/active
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state as when the procedure was invoked.
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This procedure is ignored if the checkbutton's state is <B>disabled</B>.
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<P>
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<DT><A NAME="M45">(<I>widget-name '</I><B>invoke</B>)</A><DD>
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Does just what would have happened if the user invoked the checkbutton
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with the mouse: toggle the selection state of the button and invoke
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the STk procedure associated with the checkbutton, if there is one
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(return value is undefined)
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This procedure is ignored if the checkbutton's state is <B>disabled</B>.
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<P>
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<DT><A NAME="M46">(<I>widget-name '</I><B>select</B>)</A><DD>
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Selects the checkbutton and sets the associated variable to its ``on''
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value.
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<P>
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<DT><A NAME="M47">(<I>widget-name '</I><B>toggle</B>)</A><DD>
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Toggles the selection state of the button, redisplaying it and
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modifying its associated variable to reflect the new state.
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<P>
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</DL>
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<H3><A NAME="M48">BINDINGS</A></H3>
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Tk automatically creates class bindings for checkbuttons that give them
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the following default behavior:
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<OL>
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<LI>
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A checkbutton activates whenever the mouse passes over it and deactivates
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whenever the mouse leaves the checkbutton.
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<LI>
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When mouse button 1 is pressed over a checkbutton it is invoked (its
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selection state toggles and the procedure associated with the button is
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invoked, if there is one).
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<LI>
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When a checkbutton has the input focus, the space key causes the checkbutton
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to be invoked.
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</OL>
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<P>
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If the checkbutton's state is <B>disabled</B> then none of the above
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actions occur: the checkbutton is completely non-responsive.
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<P>
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The behavior of checkbuttons can be changed by defining new bindings for
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individual widgets or by redefining the class bindings.
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<H3><A NAME="M49">SEE ALSO</A></H3>
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<B><A HREF="./button.n.html">button</A></B>, <B><A HREF="./radiobutton.n.html">radiobutton</A></B>
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<P><IMG ALIGN=TOP SRC="./Img/line-red.gif">
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<A HREF=./STk-hlp.html><IMG ALIGN=BOTTOM SRC="./Img/RefBookBlue.gif"> Back to the <B>STk</B> main page</A>
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</BODY></HTML>
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