178 lines
9.0 KiB
HTML
178 lines
9.0 KiB
HTML
<HTML><HEAD><TITLE>Tk Built-In Commands - button manual page</TITLE></HEAD>
|
|
<BODY bgcolor = #c3c3ff>
|
|
<H2><IMG ALIGN=BOTTOM SRC="./Img/ManPageBlue.gif"> button</H2>
|
|
<I>Create and manipulate button widgets</I><P><IMG ALIGN=TOP SRC="./Img/line-red.gif">
|
|
<H3><A NAME="M2">SYNOPSIS</A></H3>
|
|
(<B>button</B><I> widget-name </I>?<I>options</I>?)<BR>
|
|
<H3><A NAME="M3">STANDARD OPTIONS</A></H3>
|
|
<PRE>
|
|
<B><A HREF="options.n.html#M:activebackground">:activebackground</A></B> <B><A HREF="options.n.html#M:activeforeground">:activeforeground</A></B>
|
|
<B><A HREF="options.n.html#M:anchor">:anchor</A></B> <B><A HREF="options.n.html#M:background">:background</A></B>
|
|
<B><A HREF="options.n.html#M:bitmap">:bitmap</A></B> <B><A HREF="options.n.html#M:borderwidth">:borderwidth</A></B>
|
|
<B><A HREF="options.n.html#M:cursor">:cursor</A></B> <B><A HREF="options.n.html#M:disabledforeground">:disabledforeground</A></B>
|
|
<B><A HREF="options.n.html#M:font">:font</A></B> <B><A HREF="options.n.html#M:foreground">:foreground</A></B>
|
|
<B><A HREF="options.n.html#M:highlightbackground">:highlightbackground</A></B> <B><A HREF="options.n.html#M:highlightcolor">:highlightcolor</A></B>
|
|
<B><A HREF="options.n.html#M:highlightthickness">:highlightthickness</A></B> <B><A HREF="options.n.html#M:image">:image</A></B>
|
|
<B><A HREF="options.n.html#M:justify">:justify</A></B> <B><A HREF="options.n.html#M:padx">:padx</A></B>
|
|
<B><A HREF="options.n.html#M:pady">:pady</A></B> <B><A HREF="options.n.html#M:relief">:relief</A></B>
|
|
<B><A HREF="options.n.html#M:takefocus">:takefocus</A></B> <B><A HREF="options.n.html#M:text">:text</A></B>
|
|
<B><A HREF="options.n.html#M:textvariable">:textvariable</A></B> <B><A HREF="options.n.html#M:underline">:underline</A></B>
|
|
<B><A HREF="options.n.html#M:wraplength">:wraplength</A></B>
|
|
</PRE>
|
|
<H3><A NAME="M27">WIDGET-SPECIFIC OPTIONS</A></H3>
|
|
<DL>
|
|
<P>
|
|
<DT><I>Name</I>: <B>command</B>
|
|
<DT><I>Class</I>: <B>Command</B>
|
|
<DT><I>Option keyword</I>: <B><A NAME="M28">:command</A></B>
|
|
<DT><I>STklos slot name</I>: <B>command</B>
|
|
<DD>Specifies a STk procedure to associate with the button. This procedure
|
|
is typically invoked when mouse button 1 is released over the button
|
|
window.
|
|
<P>
|
|
<P>
|
|
<DT><I>Name</I>: <B>height</B>
|
|
<DT><I>Class</I>: <B>Height</B>
|
|
<DT><I>Option keyword</I>: <B><A NAME="M29">:height</A></B>
|
|
<DT><I>STklos slot name</I>: <B>height</B>
|
|
<DD>Specifies a desired height for the button.
|
|
If an image or bitmap is being displayed in the button then the value is in
|
|
screen units (i.e. any of the forms acceptable to <B>Tk_GetPixels</B>);
|
|
for text it is in lines of text.
|
|
If this option isn't specified, the button's desired height is computed
|
|
from the size of the image or bitmap or text being displayed in it.
|
|
<P>
|
|
<P>
|
|
<DT><I>Name</I>: <B>state</B>
|
|
<DT><I>Class</I>: <B>State</B>
|
|
<DT><I>Option keyword</I>: <B><A NAME="M30">:state</A></B>
|
|
<DT><I>STklos slot name</I>: <B>state</B>
|
|
<DD>Specifies one of three states for the button: <B>normal</B>, <B>active</B>,
|
|
or <B>disabled</B>. In normal state the button is displayed using the
|
|
<B>foreground</B> and <B>background</B> options. The active state is
|
|
typically used when the pointer is over the button. In active state
|
|
the button is displayed using the <B>activeForeground</B> and
|
|
<B>activeBackground</B> options. Disabled state means that the button
|
|
should be insensitive: the default bindings will refuse to activate
|
|
the widget and will ignore mouse button presses.
|
|
In this state the <B>disabledForeground</B> and
|
|
<B>background</B> options determine how the button is displayed.
|
|
<P>
|
|
<P>
|
|
<DT><I>Name</I>: <B>width</B>
|
|
<DT><I>Class</I>: <B>Width</B>
|
|
<DT><I>Option keyword</I>: <B><A NAME="M31">:width</A></B>
|
|
<DT><I>STklos slot name</I>: <B>width</B>
|
|
<DD>Specifies a desired width for the button.
|
|
If an image or bitmap is being displayed in the button then the value is in
|
|
screen units (i.e. any of the forms acceptable to <B>Tk_GetPixels</B>);
|
|
for text it is in characters.
|
|
If this option isn't specified, the button's desired width is computed
|
|
from the size of the image or bitmap or text being displayed in it.
|
|
<P>
|
|
</DL>
|
|
<H3><A NAME="M32">DESCRIPTION</A></H3>
|
|
The <B>button</B> procedure creates a new window (given by the
|
|
<I>widget-name</I> argument) and makes it into a button widget.
|
|
Additional
|
|
options, described above, may be specified on the procedure line
|
|
or in the option database
|
|
to configure aspects of the button such as its colors, font,
|
|
text, and initial relief. The <B>button</B> procedure returns its
|
|
<I>widget-name</I> argument. At the time this procedure is invoked,
|
|
there must not exist a window named <I>widget-name</I>, but
|
|
<I>widget-name</I>'s parent must exist.
|
|
<P>
|
|
A button is a widget
|
|
that displays a textual string, bitmap or image.
|
|
If text is displayed, it must all be in a single font, but it
|
|
can occupy multiple lines on the screen (if it contains newlines
|
|
or if wrapping occurs because of the <B>wrapLength</B> option) and
|
|
one of the characters may optionally be underlined using the
|
|
<B>underline</B> option.
|
|
It can display itself in either of three different ways, according
|
|
to
|
|
the <B>state</B> option;
|
|
it can be made to appear raised, sunken, or flat;
|
|
and it can be made to flash. When a user invokes the
|
|
button (by pressing mouse button 1 with the cursor over the
|
|
button), then the STk procedure specified in the <B>:command</B>
|
|
option is invoked.
|
|
|
|
<H3><A NAME="M33">WIDGET PROCEDURE</A></H3>
|
|
The <B>button</B> procedure creates a new STk procedure whose
|
|
name is <I>widget-name</I>. This
|
|
procedure may be used to invoke various
|
|
operations on the widget. It has the following general form:
|
|
<PRE>(<I>widget-name option </I>?<I>arg arg ...</I>?)</PRE>
|
|
<I>Option</I> and the <I>arg</I>s
|
|
determine the exact behavior of the procedure. The following
|
|
procedures are possible for button widgets:
|
|
<P>
|
|
<DL>
|
|
<DT><A NAME="M34">(<I>widget-name </I><B>'cget</B> <I>option</I>)</A><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 <B>button</B>
|
|
procedure.
|
|
<P>
|
|
<DT><A NAME="M35">(<I>widget-name </I><B>'configure</B> ?<I>option</I>? ?<I>value option value ...</I>?)</A><DD>
|
|
Query or modify the configuration options of the widget.
|
|
If no <I>option</I> is specified, returns a list describing all of
|
|
the available options for <I>widget-name</I> (see <B>Tk_ConfigureInfo</B> for
|
|
information on the format of this list). If <I>option</I> is specified
|
|
with no <I>value</I>, then the procedure returns a list describing the
|
|
one named option (this list will be identical to the corresponding
|
|
sublist of the value returned if no <I>option</I> is specified). If
|
|
one or more <I>option-value</I> pairs are specified, then the procedure
|
|
modifies the given widget option(s) to have the given value(s); in
|
|
this case the procedure returns an empty string.
|
|
<I>Option</I> may have any of the values accepted by the <B>button</B>
|
|
procedure.
|
|
<P>
|
|
<DT><A NAME="M36">(<I>widget-name </I><B>'flash</B>)</A><DD>
|
|
Flash the button. This is accomplished by redisplaying the button
|
|
several times, alternating between active and normal colors. At
|
|
the end of the flash the button is left in the same normal/active
|
|
state as when the procedure was invoked.
|
|
This procedure is ignored if the button's state is <B>disabled</B>.
|
|
<P>
|
|
<DT><A NAME="M37">(<I>widget-name </I><B>'invoke</B>)</A><DD>
|
|
Invoke the STk procedure associated with the button, if there is one
|
|
(return value is undefined).
|
|
This procedure is ignored if the button's state is <B>disabled</B>.
|
|
|
|
<P>
|
|
</DL>
|
|
<H3><A NAME="M38">DEFAULT BINDINGS</A></H3>
|
|
Tk automatically creates class bindings for buttons that give them
|
|
the following default behavior:
|
|
<OL>
|
|
<LI>
|
|
A button activates whenever the mouse passes over it and deactivates
|
|
whenever the mouse leaves the button.
|
|
<LI>
|
|
A button's relief is changed to sunken whenever mouse button 1 is
|
|
pressed over the button, and the relief is restored to its original
|
|
value when button 1 is later released.
|
|
<LI>
|
|
If mouse button 1 is pressed over a button and later released over
|
|
the button, the button is invoked. However, if the mouse is not
|
|
over the button when button 1 is released, then no invocation occurs.
|
|
<LI>
|
|
When a button has the input focus, the space key causes the button
|
|
to be invoked.
|
|
</OL>
|
|
<P>
|
|
If the button's state is <B>disabled</B> then none of the above
|
|
actions occur: the button is completely non-responsive.
|
|
<P>
|
|
The behavior of buttons can be changed by defining new bindings for
|
|
individual widgets or by redefining the class bindings.
|
|
|
|
<H3><A NAME="M39">SEE ALSO</A></H3>
|
|
<B><A HREF="./checkbutton.n.html">checkbutton</A></B>, <B><A HREF="./radiobutton.n.html">radiobutton</A></B>
|
|
<P><IMG ALIGN=TOP SRC="./Img/line-red.gif">
|
|
<A HREF=./STk-hlp.html><IMG ALIGN=BOTTOM SRC="./Img/RefBookBlue.gif"> Back to the <B>STk</B> main page</A>
|
|
</BODY></HTML>
|