options.htm

是TCL的另外一个编译（解释）器

The value may have any of the forms acceptable to <B><A HREF="../TkLib/GetPixels.htm">Tk_GetPixels</A></B>.
If a border has been specified for the insertion
cursor (using the <B>insertBorderWidth</B> option), the border
will be drawn inside the width specified by the <B>insertWidth</B>
option.
<P><DT>Command-Line Name: <B><A NAME="M-jump">-jump</A></B>
<DT>Database Name: <B>jump</B>
<DT>Database Class: <B>Jump</B>
<DD>For widgets with a slider that can be dragged to adjust a value,
such as scrollbars, this option determines when
notifications are made about changes in the value.
The option's value must be a boolean of the form accepted by
<B><A HREF="../TclLib/GetInt.htm">Tcl_GetBoolean</A></B>.
If the value is false, updates are made continuously as the
slider is dragged.
If the value is true, updates are delayed until the mouse button
is released to end the drag;  at that point a single notification
is made (the value ``jumps'' rather than changing smoothly).
<P><DT>Command-Line Name: <B><A NAME="M-justify">-justify</A></B>
<DT>Database Name: <B>justify</B>
<DT>Database Class: <B>Justify</B>
<DD>When there are multiple lines of text displayed in a widget, this
option determines how the lines line up with each other.
Must be one of <B>left</B>, <B>center</B>, or <B>right</B>.
<B>Left</B> means that the lines' left edges all line up, <B>center</B>
means that the lines' centers are aligned, and <B>right</B> means
that the lines' right edges line up.
<P><DT>Command-Line Name: <B><A NAME="M-orient">-orient</A></B>
<DT>Database Name: <B>orient</B>
<DT>Database Class: <B>Orient</B>
<DD>For widgets that can lay themselves out with either a horizontal
or vertical orientation, such as scrollbars, this option specifies
which orientation should be used.  Must be either <B>horizontal</B>
or <B>vertical</B> or an abbreviation of one of these.
<P><DT>Command-Line Name: <B><A NAME="M-padx">-padx</A></B>
<DT>Database Name: <B>padX</B>
<DT>Database Class: <B>Pad</B>
<DD>Specifies a non-negative value indicating how much extra space
to request for the widget in the X-direction.
The value may have any of the forms acceptable to <B><A HREF="../TkLib/GetPixels.htm">Tk_GetPixels</A></B>.
When computing how large a window it needs, the widget will
add this amount to the width it would normally need (as determined
by the width of the things displayed in the widget);  if the geometry
manager can satisfy this request, the widget will end up with extra
internal space to the left and/or right of what it displays inside.
Most widgets only use this option for padding text:  if they are
displaying a bitmap or image, then they usually ignore padding
options.
<P><DT>Command-Line Name: <B><A NAME="M-pady">-pady</A></B>
<DT>Database Name: <B>padY</B>
<DT>Database Class: <B>Pad</B>
<DD>Specifies a non-negative value indicating how much extra space
to request for the widget in the Y-direction.
The value may have any of the forms acceptable to <B><A HREF="../TkLib/GetPixels.htm">Tk_GetPixels</A></B>.
When computing how large a window it needs, the widget will add
this amount to the height it would normally need (as determined by
the height of the things displayed in the widget);  if the geometry
manager can satisfy this request, the widget will end up with extra
internal space above and/or below what it displays inside.
Most widgets only use this option for padding text:  if they are
displaying a bitmap or image, then they usually ignore padding
options.
<P><DT>Command-Line Name: <B><A NAME="M-relief">-relief</A></B>
<DT>Database Name: <B>relief</B>
<DT>Database Class: <B>Relief</B>
<DD>Specifies the 3-D effect desired for the widget.  Acceptable
values are <B>raised</B>, <B>sunken</B>, <B>flat</B>, <B>ridge</B>,
<B>solid</B>, and <B>groove</B>.
The value
indicates how the interior of the widget should appear relative
to its exterior;  for example, <B>raised</B> means the interior of
the widget should appear to protrude from the screen, relative to
the exterior of the widget.
<P><DT>Command-Line Name: <B><A NAME="M-repeatdelay">-repeatdelay</A></B>
<DT>Database Name: <B>repeatDelay</B>
<DT>Database Class: <B>RepeatDelay</B>
<DD>Specifies the number of milliseconds a button or key must be held
down before it begins to auto-repeat.  Used, for example, on the
up- and down-arrows in scrollbars.
<P><DT>Command-Line Name: <B><A NAME="M-repeatinterval">-repeatinterval</A></B>
<DT>Database Name: <B>repeatInterval</B>
<DT>Database Class: <B>RepeatInterval</B>
<DD>Used in conjunction with <B>repeatDelay</B>:  once auto-repeat
begins, this option determines the number of milliseconds between
auto-repeats.
<P><DT>Command-Line Name: <B><A NAME="M-selectbackground">-selectbackground</A></B>
<DT>Database Name: <B>selectBackground</B>
<DT>Database Class: <B>Foreground</B>
<DD>Specifies the background color to use when displaying selected
items.
<P><DT>Command-Line Name: <B><A NAME="M-selectborderwidth">-selectborderwidth</A></B>
<DT>Database Name: <B>selectBorderWidth</B>
<DT>Database Class: <B>BorderWidth</B>
<DD>Specifies a non-negative value indicating the width
of the 3-D border to draw around selected items.
The value may have any of the forms acceptable to <B><A HREF="../TkLib/GetPixels.htm">Tk_GetPixels</A></B>.
<P><DT>Command-Line Name: <B><A NAME="M-selectforeground">-selectforeground</A></B>
<DT>Database Name: <B>selectForeground</B>
<DT>Database Class: <B>Background</B>
<DD>Specifies the foreground color to use when displaying selected
items.
<P><DT>Command-Line Name: <B><A NAME="M-setgrid">-setgrid</A></B>
<DT>Database Name: <B>setGrid</B>
<DT>Database Class: <B>SetGrid</B>
<DD>Specifies a boolean value that determines whether this widget controls the
resizing grid for its top-level window.
This option is typically used in text widgets, where the information
in the widget has a natural size (the size of a character) and it makes
sense for the window's dimensions to be integral numbers of these units.
These natural window sizes form a grid.
If the <B>setGrid</B> option is set to true then the widget will
communicate with the window manager so that when the user interactively
resizes the top-level window that contains the widget, the dimensions of
the window will be displayed to the user in grid units and the window
size will be constrained to integral numbers of grid units.
See the section GRIDDED GEOMETRY MANAGEMENT in the <B><A HREF="../TkCmd/wm.htm">wm</A></B> manual
entry for more details.
<P><DT>Command-Line Name: <B><A NAME="M-takefocus">-takefocus</A></B>
<DT>Database Name: <B>takeFocus</B>
<DT>Database Class: <B>TakeFocus</B>
<DD>Determines whether the window accepts the focus during keyboard
traversal (e.g., Tab and Shift-Tab).
Before setting the focus to a window, the traversal scripts
consult the value of the <B>takeFocus</B> option.
A value of <B>0</B> means that the window should be skipped entirely
during keyboard traversal. 
<B>1</B> means that the window should receive the input
focus as long as it is viewable (it and all of its ancestors are mapped).
An empty value for the option means that the traversal scripts make
the decision about whether or not to focus on the window:  the current
algorithm is to skip the window if it is
disabled, if it has no key bindings, or if it is not viewable.
If the value has any other form, then the traversal scripts take
the value, append the name of the window to it (with a separator space),
and evaluate the resulting string as a Tcl script.
The script must return <B>0</B>, <B>1</B>, or an empty string:  a 
<B>0</B> or <B>1</B> value specifies whether the window will receive
the input focus, and an empty string results in the default decision
described above.
Note: this interpretation of the option is defined entirely by
the Tcl scripts that implement traversal:  the widget implementations
ignore the option entirely, so you can change its meaning if you
redefine the keyboard traversal scripts.
<P><DT>Command-Line Name: <B><A NAME="M-text">-text</A></B>
<DT>Database Name: <B><A HREF="../TkCmd/text.htm">text</A></B>
<DT>Database Class: <B><A HREF="../TkCmd/text.htm">Text</A></B>
<DD>Specifies a string to be displayed inside the widget.  The way in which
the string is displayed depends on the particular widget and may be
determined by other options, such as <B>anchor</B> or <B>justify</B>.
<P><DT>Command-Line Name: <B><A NAME="M-textvariable">-textvariable</A></B>
<DT>Database Name: <B>textVariable</B>
<DT>Database Class: <B><A HREF="../TclCmd/variable.htm">Variable</A></B>
<DD>Specifies the name of a variable.  The value of the variable is a text
string to be displayed inside the widget;  if the variable value changes
then the widget will automatically update itself to reflect the new value.
The way in which the string is displayed in the widget depends on the
particular widget and may be determined by other options, such as
<B>anchor</B> or <B>justify</B>.
<P><DT>Command-Line Name: <B><A NAME="M-troughcolor">-troughcolor</A></B>
<DT>Database Name: <B>troughColor</B>
<DT>Database Class: <B>Background</B>
<DD>Specifies the color to use for the rectangular trough areas
in widgets such as scrollbars and scales.
<P><DT>Command-Line Name: <B><A NAME="M-underline">-underline</A></B>
<DT>Database Name: <B>underline</B>
<DT>Database Class: <B>Underline</B>
<DD>Specifies the integer index of a character to underline in the widget.
This option is used by the default bindings to implement keyboard
traversal for menu buttons and menu entries.
0 corresponds to the first character of the text displayed in the
widget, 1 to the next character, and so on.
<P><DT>Command-Line Name: <B><A NAME="M-wraplength">-wraplength</A></B>
<DT>Database Name: <B>wrapLength</B>
<DT>Database Class: <B>WrapLength</B>
<DD>For widgets that can perform word-wrapping, this option specifies
the maximum line length.
Lines that would exceed this length are wrapped onto the next line,
so that no line is longer than the specified length.
The value may be specified in any of the standard forms for
screen distances.
If this value is less than or equal to 0 then no wrapping is done:  lines
will break only at newline characters in the text.
<P><DT>Command-Line Name: <B><A NAME="M-xscrollcommand">-xscrollcommand</A></B>
<DT>Database Name: <B>xScrollCommand</B>
<DT>Database Class: <B>ScrollCommand</B>
<DD>Specifies the prefix for a command used to communicate with horizontal
scrollbars.
When the view in the widget's window changes (or
whenever anything else occurs that could change the display in a
scrollbar, such as a change in the total size of the widget's
contents), the widget will
generate a Tcl command by concatenating the scroll command and
two numbers.
Each of the numbers is a fraction between 0 and 1, which indicates
a position in the document.  0 indicates the beginning of the document,
1 indicates the end, .333 indicates a position one third the way through
the document, and so on.
The first fraction indicates the first information in the document
that is visible in the window, and the second fraction indicates
the information just after the last portion that is visible.
The command is
then passed to the Tcl interpreter for execution.  Typically the
<B>xScrollCommand</B> option consists of the path name of a scrollbar
widget followed by ``set'', e.g. ``.x.scrollbar set'':  this will cause
the scrollbar to be updated whenever the view in the window changes.
If this option is not specified, then no command will be executed.
<P><DT>Command-Line Name: <B><A NAME="M-yscrollcommand">-yscrollcommand</A></B>
<DT>Database Name: <B>yScrollCommand</B>
<DT>Database Class: <B>ScrollCommand</B>
<DD>Specifies the prefix for a command used to communicate with vertical
scrollbars.  This option is treated in the same way as the
<B>xScrollCommand</B> option, except that it is used for vertical
scrollbars and is provided by widgets that support vertical scrolling.
See the description of <B>xScrollCommand</B> for details
on how this option is used.

</DL>
<H3><A NAME="M4">KEYWORDS</A></H3>
<A href="../Keywords/C.htm#class">class</A>, <A href="../Keywords/N.htm#name">name</A>, <A href="../Keywords/S.htm#standard option">standard option</A>, <A href="../Keywords/S.htm#switch">switch</A>
<HR><PRE>
<A HREF="../copyright.htm">Copyright</A> &#169; 1990-1994 The Regents of the University of California.
<A HREF="../copyright.htm">Copyright</A> &#169; 1994-1996 Sun Microsystems, Inc.
<A HREF="../copyright.htm">Copyright</A> &#169; 1995-1997 Roger E. Critchlow Jr.</PRE>
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