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-# Copyright (c) 1990-1994 The Regents of the University of California.
-# Copyright (c) 1994-1996 Sun Microsystems, Inc.
-# See the file "license.terms" for information on usage and redistribution
-# of this file, and for a DISCLAIMER OF ALL WARRANTIES.
-#
-#
-
-=head1 NAME
-
-Tk::options - Standard options supported by widgets and their manipulation
-
-=for category Creating and Configuring Widgets
-
-=head1 SYNOPSIS
-
-S< >I<$value> = I<$widget>-E<gt>B<cget>('I<-option>');
-
-S< >I<$widget>-E<gt>B<configure>(I<-option>=E<gt>I<value> ?,I<-option>=E<gt>I<value> ...?);
-
-S< >I<@list> = I<$widget>-E<gt>B<configure>('I<-option>');
-
-S< >I<@lol> = I<$widget>-E<gt>B<configure>;
-
-=head1 DESCRIPTION
-
-All widgets, and images have a standard mechanism for setting and querying
-attibutes or options. The mechanism is based on two methods B<configure>
-and B<cget>. The behaviour of these methods is as follows:
-
-=over 4
-
-=item I<$widget>-E<gt>B<configure>(I<-option>=E<gt>I<value> ?,I<-option>=E<gt>I<value> ...?);
-
-Sets the values of I<-option> to I<value> for each I<-option>=E<gt>I<value>
-pair. The internal B<new> method does an implicit B<configure> in this
-form with options passed in at widget create time.
-
-=item I<$widget>-E<gt>B<configure>('I<-option>')
-
-In array context returns a list of five or two elements. If I<-option>
-is an alias for another options it return a list consisting of the
-alias option and the name for the option is is an alias for, e.g.,
-C<('-bg', 'background')>. If I<-option> is not an alias the returned
-list has the following five elements:
-
-=over 8
-
-=item I<Option Name>
-
-The value of I<-option>, e.g., B<-background>.
-
-=item I<Name>
-
-The option's name in the option database, e.g., C<background>.
-
-=item I<Class>
-
-The option's class value in the option database, e.g., C<Background>.
-
-=item I<Default>
-
-The default value for the option if not specified or in the option database,
-e.g., C<grey>.
-
-=item I<Value>
-
-The current value (as returned by B<cget>), e.g., C<white>.
-
-=back
-
-=item I<$widget>-E<gt>B<configure>
-
-Returns a list of lists for all the options supported by I<$widget>.
-Each sub-list is in the form returned by B<configure>('I<-option>').
-(This mechanism is used by the B<Tk::Derived> class to determine
-the options available from base class.)
-
-=item I<$widget>-E<gt>B<cget>('I<-option>')
-
-Returns the current value of I<-option> for I<$widget>.
-
-B<cget>('I<-option>') is clumsy with the need for B<''> due to perl's
-parsing rules. Something more subtle using L<tie|perlfunc/tie> might look better.
-
-=back
-
-The following paragraphs describe the common configuration options supported by
-widgets in the Tk toolkit. Every widget does not necessarily support every option
-(see the the documentation entries for individual widgets for a list of the
-standard options supported by that widget), but if a widget does support an option
-with one of the names listed below, then the option has exactly the effect
-described below.
-
-In the descriptions below, ``Name'' refers to the option's name in the option
-database. ``Class'' refers to the option's class value
-in the option database. ``Switch'' refers to the switch used in widget-creation
-and B<configure> widget methods to set this value. For example, if an option's
-configure option is B<-foreground> and there exists a widget I<$widget>, then the
-call:
-
-S< >I<$widget>-E<gt>B<configure>(B<-foreground>=E<gt>B<'black'>)
-
-may be used to specify the value B<black> for the option in the widget I<$widget>.
-Configure options may be abbreviated, as long as the abbreviation is unambiguous
-(abbreviation is deprecated in perl/Tk).
-
-=head2 Creation options: Widget Name and Class
-
-The B<Name> and B<-class> options can only be specified when a widget is
-created, and cannot be changed with B<configure>. These options determine
-the widget's identity and how Tk applies resource values from the
-option database (see L<Tk::option>) and so they
-cannot be assigned by the options database.
-
-=over 4
-
-=item Name: I<name>
-
-=item Switch: B<Name>
-
-Specifies the path element for the widget. Names generally begin with a
-lowercase letter.
-
-Each widget has a unique I<pathname> that follows the hierarchy from the
-B<MainWindow> to the widget itself. Since the widget's B<PathName> is
-used to assign options from the options database, it is important to
-specify a distinctive B<Name> for any widget that will have non-default
-options. See L<Tk::option> for details.
-
-=item Name: I<class>
-
-=item Switch: B<-class>
-
-Specifies a class for the window. Classes generally begin with an
-uppercase letter.
-
-This class will be used when querying the option database for
-the window's other options (see Tk::options), and it will also be used
-later for other purposes such as bindings. One typically assigns a class
-to a B<TopLevel> or B<Frame> so that the class will apply to all of
-that widget's children.
-
-=back
-
-=head2 Reconfigurable options
-
-These options can be set at widget creation or changed later via B<configure>.
-
-=over 4
-
-=item Name: B<activeBackground>
-
-=item Class: B<Foreground>
-
-=item Switch: B<-activebackground>
-
-Specifies background color to use when drawing active elements.
-An element (a widget or portion of a widget) is active if the
-mouse cursor is positioned over the element and pressing a mouse button
-will cause some action to occur.
-If strict Motif compliance has been requested by setting the
-B<$Tk::strictMotif> variable, this option will normally be
-ignored; the normal background color will be used instead.
-For some elements on Windows and Macintosh systems, the active color
-will only be used while mouse button 1 is pressed over the element.
-
-=item Name: B<activeBorderWidth>
-
-=item Class: B<BorderWidth>
-
-=item Switch: B<-activeborderwidth>
-
-Specifies a non-negative value indicating
-the width of the 3-D border drawn around active elements.
-See above for definition of active elements.
-The value may have any of the forms acceptable to B<Tk_GetPixels>.
-This option is typically only available in widgets displaying more
-than one element at a time (e.g. menus but not buttons).
-
-=item Name: B<activeForeground>
-
-=item Class: B<Background>
-
-=item Switch: B<-activeforeground>
-
-Specifies foreground color to use when drawing active elements.
-See above for definition of active elements.
-
-=item Name: B<activetile>
-
-=item Class: B<Tile>
-
-=item Switch: B<-activetile>
-
-Specifies image used to display inside active elements of the widget.
-See above for definition of active elements.
-
-=item Name: B<anchor>
-
-=item Class: B<Anchor>
-
-=item Switch: B<-anchor>
-
-Specifies how the information in a widget (e.g. text or a bitmap)
-is to be displayed in the widget.
-Must be one of the values B<n>, B<ne>, B<e>, B<se>,
-B<s>, B<sw>, B<w>, B<nw>, or B<center>.
-For example, B<nw> means display the information such that its
-top-left corner is at the top-left corner of the widget.
-
-=item Name: B<background>
-
-=item Class: B<Background>
-
-=item Switch: B<-background>
-
-=item Alias: B<-bg>
-
-Specifies the normal background color to use when displaying the
-widget.
-
-=item Name: B<bitmap>
-
-=item Class: B<Bitmap>
-
-=item Switch: B<-bitmap>
-
-Specifies a bitmap to display in the widget, in any of the forms
-acceptable to B<Tk_GetBitmap>.
-The exact way in which the bitmap is displayed may be affected by
-other options such as B<-anchor> or B<-justify>.
-Typically, if this option is specified then it overrides other
-options that specify a textual value to display in the widget;
-the B<-bitmap> option may be reset to an empty string to re-enable
-a text display.
-In widgets that support both B<-bitmap> and B<-image> options,
-B<-image> will usually override B<-bitmap>.
-
-=item Name: B<borderWidth>
-
-=item Class: B<BorderWidth>
-
-=item Switch: B<-borderwidth>
-
-=item Alias: B<-bd>
-
-Specifies a non-negative value indicating the width
-of the 3-D border to draw around the outside of the widget (if such a
-border is being drawn; the B<relief> option typically determines
-this). The value may also be used when drawing 3-D effects in the
-interior of the widget.
-The value may have any of the forms acceptable to B<Tk_GetPixels>.
-
-=item Name: B<compound>
-
-=item Class: B<Compound>
-
-=item Switch: B<-compound>
-
-Specifies if the widget should display text and bitmaps/images at the
-same time, and if so, where the bitmap/image should be placed relative
-to the text. Must be one of the values B<none>, B<bottom>, B<top>,
-B<left>, B<right>, or B<center>. For example, the (default) value
-B<none> specifies that the bitmap or image should (if defined) be
-displayed instead of the text, the value B<left> specifies that the
-bitmap or image should be displayed to the left of the text, and the
-value B<center> specifies that the bitmap or image should be displayed on
-top of the text.
-
-=item Name: B<cursor>
-
-=item Class: B<Cursor>
-
-=item Switch: B<-cursor>
-
-Specifies the mouse cursor to be used for the widget.
-The value may have any of the forms acceptable to B<Tk_GetCursor>.
-
-=item Name: B<dash>
-
-=item Class: B<Dash>
-
-=item Switch: B<-dash>
-
-The value may have any of the forms accepted by B<Tk_GetDash>,
-such as B<4>, B<[6,4]>, B<.>, B<->, B<-.>, or B<-..>.
-
-=item Name: B<dashoffset>
-
-=item Class: B<Dashoffset>
-
-=item Switch: B<-dashoffset>
-
-Specifies the offset in the dash list where the drawing starts.
-
-=item Name: B<disabledForeground>
-
-=item Class: B<DisabledForeground>
-
-=item Switch: B<-disabledforeground>
-
-Specifies foreground color to use when drawing a disabled element.
-If the option is specified as an empty string (which is typically the
-case on monochrome displays), disabled elements are drawn with the
-normal foreground color but they are dimmed by drawing them
-with a stippled fill pattern.
-
-=item Name: B<disabledtile>
-
-=item Class: B<Tile>
-
-=item Switch: B<-disabledtile>
-
-Specifies image to use when drawing a disabled element.
-
-=item Name: B<exportSelection>
-
-=item Class: B<ExportSelection>
-
-=item Switch: B<-exportselection>
-
-Specifies whether or not a selection in the widget should also be
-the X selection.
-The value may have any of the forms accepted by B<Tcl_GetBoolean>,
-such as B<true>, B<false>, B<0>, B<1>, B<yes>, or B<no>.
-If the selection is exported, then selecting in the widget deselects
-the current X selection, selecting outside the widget deselects any
-widget selection, and the widget will respond to selection retrieval
-requests when it has a selection. The default is usually for widgets
-to export selections.
-
-=item Name: B<font>
-
-=item Class: B<Font>
-
-=item Switch: B<-font>
-
-Specifies the font to use when drawing text inside the widget.
-
-=item Name: B<foreground>
-
-=item Class: B<Foreground>
-
-=item Switch: B<-foreground>
-
-=item Alias: B<-fg>
-
-Specifies the normal foreground color to use when displaying the widget.
-
-=item Name: B<highlightBackground>
-
-=item Class: B<HighlightBackground>
-
-=item Switch: B<-highlightbackground>
-
-Specifies the color to display in the traversal highlight region when
-the widget does not have the input focus.
-
-=item Name: B<highlightColor>
-
-=item Class: B<HighlightColor>
-
-=item Switch: B<-highlightcolor>
-
-Specifies the color to use for the traversal highlight rectangle that is
-drawn around the widget when it has the input focus.
-
-=item Name: B<highlightThickness>
-
-=item Class: B<HighlightThickness>
-
-=item Switch: B<-highlightthickness>
-
-Specifies a non-negative value indicating the width of the highlight
-rectangle to draw around the outside of the widget when it has the
-input focus.
-The value may have any of the forms acceptable to B<Tk_GetPixels>.
-If the value is zero, no focus highlight is drawn around the widget.
-
-=item Name: B<image>
-
-=item Class: B<Image>
-
-=item Switch: B<-image>
-
-Specifies an image to display in the widget, which must have been
-created with an image create. (See L<Tk::Image> for details of image creation.)
-Typically, if the B<-image> option is specified then it overrides other
-options that specify a bitmap or textual value to display in the widget;
-the B<-image> option may be reset to an empty string to re-enable
-a bitmap or text display.
-
-=item Name: B<insertBackground>
-
-=item Class: B<Foreground>
-
-=item Switch: B<-insertbackground>
-
-Specifies the color to use as background in the area covered by the
-insertion cursor. This color will normally override either the normal
-background for the widget (or the selection background if the insertion
-cursor happens to fall in the selection).
-
-=item Name: B<insertBorderWidth>
-
-=item Class: B<BorderWidth>
-
-=item Switch: B<-insertborderwidth>
-
-Specifies a non-negative value indicating the width
-of the 3-D border to draw around the insertion cursor.
-The value may have any of the forms acceptable to B<Tk_GetPixels>.
-
-=item Name: B<insertOffTime>
-
-=item Class: B<OffTime>
-
-=item Switch: B<-insertofftime>
-
-Specifies a non-negative integer value indicating the number of
-milliseconds the insertion cursor should remain ``off'' in each blink cycle.
-If this option is zero then the cursor doesn't blink: it is on
-all the time.
-
-=item Name: B<insertOnTime>
-
-=item Class: B<OnTime>
-
-=item Switch: B<-insertontime>
-
-Specifies a non-negative integer value indicating the number of
-milliseconds the insertion cursor should remain ``on'' in each blink cycle.
-
-=item Name: B<insertWidth>
-
-=item Class: B<InsertWidth>
-
-=item Switch: B<-insertwidth>
-
-Specifies a value indicating the total width of the insertion cursor.
-The value may have any of the forms acceptable to B<Tk_GetPixels>.
-If a border has been specified for the insertion
-cursor (using the B<insertBorderWidth> option), the border
-will be drawn inside the width specified by the B<insertWidth>
-option.
-
-=item Name: B<jump>
-
-=item Class: B<Jump>
-
-=item Switch: B<-jump>
-
-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<Tcl_GetBoolean>.
-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).
-
-=item Name: B<justify>
-
-=item Class: B<Justify>
-
-=item Switch: B<-justify>
-
-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<center>, or B<right>.
-B<Left> means that the lines' left edges all line up, B<center>
-means that the lines' centers are aligned, and B<right> means
-that the lines' right edges line up.
-
-=item Name: B<offset>
-
-=item Class: B<Offset>
-
-=item Switch: B<-offset>
-
-Specifies the offset of tiles (see also B<-tile> option). It can
-have two different formats B<-offset x,y> or B<-offset side>,
-where side can be B<n>, B<ne>, B<e>, B<se>, B<s>,
-B<sw>, B<w>, B<nw>, or B<center>. In the first case
-the origin is the origin of the toplevel of the current window.
-For the canvas itself and canvas objects the origin is the canvas
-origin, but putting B<#> in front of the coordinate pair
-indicates using the toplevel origin in stead. For canvas objects,
-the B<-offset> option is used for stippling as well.
-For the line and polygon canvas items you can also specify
-an index as argument, which connects the stipple or tile
-origin to one of the coordinate points of the line/polygon.
-
-=item Name: B<orient>
-
-=item Class: B<Orient>
-
-=item Switch: B<-orient>
-
-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>
-or B<vertical> or an abbreviation of one of these.
-
-=item Name: B<padX>
-
-=item Class: B<Pad>
-
-=item Switch: B<-padx>
-
-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<Tk_GetPixels>.
-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.
-
-=item Name: B<padY>
-
-=item Class: B<Pad>
-
-=item Switch: B<-pady>
-
-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<Tk_GetPixels>.
-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.
-
-=item Name: B<relief>
-
-=item Class: B<Relief>
-
-=item Switch: B<-relief>
-
-Specifies the 3-D effect desired for the widget. Acceptable
-values are B<raised>, B<sunken>, B<flat>, B<ridge>,
-B<solid>, and B<groove>.
-The value
-indicates how the interior of the widget should appear relative
-to its exterior; for example, B<raised> means the interior of
-the widget should appear to protrude from the screen, relative to
-the exterior of the widget.
-
-=item Name: B<repeatDelay>
-
-=item Class: B<RepeatDelay>
-
-=item Switch: B<-repeatdelay>
-
-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.
-
-=item Name: B<repeatInterval>
-
-=item Class: B<RepeatInterval>
-
-=item Switch: B<-repeatinterval>
-
-Used in conjunction with B<repeatDelay>: once auto-repeat
-begins, this option determines the number of milliseconds between
-auto-repeats.
-
-=item Name: B<selectBackground>
-
-=item Class: B<Foreground>
-
-=item Switch: B<-selectbackground>
-
-Specifies the background color to use when displaying selected
-items.
-
-=item Name: B<selectBorderWidth>
-
-=item Class: B<BorderWidth>
-
-=item Switch: B<-selectborderwidth>
-
-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<Tk_GetPixels>.
-
-=item Name: B<selectForeground>
-
-=item Class: B<Background>
-
-=item Switch: B<-selectforeground>
-
-Specifies the foreground color to use when displaying selected
-items.
-
-=item Name: B<setGrid>
-
-=item Class: B<SetGrid>
-
-=item Switch: B<-setgrid>
-
-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> 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 L<Tk::Wm/"GRIDDED GEOMETRY MANAGEMENT">
-for more details.
-
-=item Name: B<takeFocus>
-
-=item Class: B<TakeFocus>
-
-=item Switch: B<-takefocus>
-
-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> option.
-A value of B<0> means that the window should be skipped entirely
-during keyboard traversal.
-B<1> 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 Callback.
-The script must return B<0>, B<1>, or an empty string: a
-B<0> or B<1> 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 Callbacks that implement traversal: the widget implementations
-ignore the option entirely, so you can change its meaning if you
-redefine the keyboard traversal scripts.
-
-=item Name: B<text>
-
-=item Class: B<Text>
-
-=item Switch: B<-text>
-
-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> or B<justify>.
-
-=item Name: B<textVariable>
-
-=item Class: B<Variable>
-
-=item Switch: B<-textvariable>
-
-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> or B<justify>.
-
-=item Name: B<tile>
-
-=item Class: B<Tile>
-
-=item Switch: B<-tile>
-
-Specifies image used to display the widget. If image is the empty
-string, then the normal background color is displayed.
-
-=item Name: B<troughColor>
-
-=item Class: B<Background>
-
-=item Switch: B<-troughcolor>
-
-Specifies the color to use for the rectangular trough areas
-in widgets such as scrollbars and scales.
-
-=item Name: B<troughTile>
-
-=item Class: B<Tile>
-
-=item Switch: B<-troughtile>
-
-Specifies image used to display in the rectangular trough areas
-in widgets such as scrollbars and scales.
-
-=item Name: B<underline>
-
-=item Class: B<Underline>
-
-=item Switch: B<-underline>
-
-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.
-
-=item Name: B<wrapLength>
-
-=item Class: B<WrapLength>
-
-=item Switch: B<-wraplength>
-
-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.
-
-=item Name: B<xScrollCommand>
-
-=item Class: B<ScrollCommand>
-
-=item Switch: B<-xscrollcommand>
-
-Specifies a callback 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
-make a callback passing two numeric arguments in addition to
-any specified in the callback.
-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.
-Typically the
-B<xScrollCommand> option consists of the scrollbar widget object
-and the method ``set'' i.e. [B<set> =E<gt> I<$sb>]:
-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.
-
-=item Name: B<yScrollCommand>
-
-=item Class: B<ScrollCommand>
-
-=item Switch: B<-yscrollcommand>
-
-Specifies a calback used to communicate with vertical
-scrollbars. This option is treated in the same way as the
-B<xScrollCommand> option, except that it is used for vertical
-scrollbars and is provided by widgets that support vertical scrolling.
-See the description of B<xScrollCommand> for details
-on how this option is used.
-
-=back
-
-=head1 SEE ALSO
-
-L<Tk::option>
-L<Tk::callbacks>
-L<Tk::ConfigSpecs>
-L<Tk_GetPixels|Tk::pTk::GetPixels>
-
-=head1 KEYWORDS
-
-class, name, standard option, switch
-
-=cut
-