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authorWilliam Joye <wjoye@cfa.harvard.edu>2017-10-17 19:50:58 (GMT)
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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.
-'\"
-.TH button n 4.4 Tk "Tk Built-In Commands"
-.so man.macros
-.BS
-'\" Note: do not modify the .SH NAME line immediately below!
-.SH NAME
-button \- Create and manipulate 'button' action widgets
-.SH SYNOPSIS
-\fBbutton\fR \fIpathName \fR?\fIoptions\fR?
-.SO
-\-activebackground \-font \-relief
-\-activeforeground \-foreground \-repeatdelay
-\-anchor \-highlightbackground \-repeatinterval
-\-background \-highlightcolor \-takefocus
-\-bitmap \-highlightthickness \-text
-\-borderwidth \-image \-textvariable
-\-compound \-justify \-underline
-\-cursor \-padx \-wraplength
-\-disabledforeground \-pady
-.SE
-.SH "WIDGET-SPECIFIC OPTIONS"
-.OP \-command command Command
-Specifies a Tcl command to associate with the button. This command
-is typically invoked when mouse button 1 is released over the button
-window.
-.OP \-default default Default
-Specifies one of three states for the default ring: \fBnormal\fR,
-\fBactive\fR, or \fBdisabled\fR. In active state, the button is drawn
-with the platform specific appearance for a default button. In normal
-state, the button is drawn with the platform specific appearance for a
-non-default button, leaving enough space to draw the default button
-appearance. The normal and active states will result in buttons of
-the same size. In disabled state, the button is drawn with the
-non-default button appearance without leaving space for the default
-appearance. The disabled state may result in a smaller button than
-the active state.
-.OP \-height height Height
-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 \fBTk_GetPixels\fR);
-for text it is in lines of text.
-If this option is not specified, the button's desired height is computed
-from the size of the image or bitmap or text being displayed in it.
-.OP \-overrelief overRelief OverRelief
-Specifies an alternative relief for the button, to be used when the
-mouse cursor is over the widget. This option can be used to make
-toolbar buttons, by configuring \fB\-relief flat \-overrelief
-raised\fR. If the value of this option is the empty string, then no
-alternative relief is used when the mouse cursor is over the button.
-The empty string is the default value.
-.OP \-state state State
-Specifies one of three states for the button: \fBnormal\fR, \fBactive\fR,
-or \fBdisabled\fR. In normal state the button is displayed using the
-\fB\-foreground\fR and \fB\-background\fR options. The active state is
-typically used when the pointer is over the button. In active state
-the button is displayed using the \fB\-activeforeground\fR and
-\fB\-activebackground\fR 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 \fB\-disabledforeground\fR and
-\fB\-background\fR options determine how the button is displayed.
-.OP \-width width Width
-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 \fBTk_GetPixels\fR).
-For a text button (no image or with \fB\-compound none\fR) then the width
-specifies how much space in characters to allocate for the text label.
-If the width is negative then this specifies a minimum width.
-If this option is not specified, the button's desired width is computed
-from the size of the image or bitmap or text being displayed in it.
-.BE
-.SH DESCRIPTION
-.PP
-The \fBbutton\fR command creates a new window (given by the
-\fIpathName\fR argument) and makes it into a button widget.
-Additional
-options, described above, may be specified on the command line
-or in the option database
-to configure aspects of the button such as its colors, font,
-text, and initial relief. The \fBbutton\fR command returns its
-\fIpathName\fR argument. At the time this command is invoked,
-there must not exist a window named \fIpathName\fR, but
-\fIpathName\fR's parent must exist.
-.PP
-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 \fB\-wraplength\fR option) and
-one of the characters may optionally be underlined using the
-\fB\-underline\fR option.
-It can display itself in either of three different ways, according
-to
-the \fB\-state\fR 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 Tcl command specified in the \fB\-command\fR
-option is invoked.
-.SH "WIDGET COMMAND"
-.PP
-The \fBbutton\fR command creates a new Tcl command whose
-name is \fIpathName\fR. This
-command may be used to invoke various
-operations on the widget. It has the following general form:
-.CS
-\fIpathName option \fR?\fIarg arg ...\fR?
-.CE
-\fIOption\fR and the \fIarg\fRs
-determine the exact behavior of the command. The following
-commands are possible for button widgets:
-.TP
-\fIpathName \fBcget\fR \fIoption\fR
-Returns the current value of the configuration option given
-by \fIoption\fR.
-\fIOption\fR may have any of the values accepted by the \fBbutton\fR
-command.
-.TP
-\fIpathName \fBconfigure\fR ?\fIoption\fR? ?\fIvalue option value ...\fR?
-Query or modify the configuration options of the widget.
-If no \fIoption\fR is specified, returns a list describing all of
-the available options for \fIpathName\fR (see \fBTk_ConfigureInfo\fR for
-information on the format of this list). If \fIoption\fR is specified
-with no \fIvalue\fR, then the command returns a list describing the
-one named option (this list will be identical to the corresponding
-sublist of the value returned if no \fIoption\fR is specified). If
-one or more \fIoption\-value\fR pairs are specified, then the command
-modifies the given widget option(s) to have the given value(s); in
-this case the command returns an empty string.
-\fIOption\fR may have any of the values accepted by the \fBbutton\fR
-command.
-.TP
-\fIpathName \fBflash\fR
-Flash the button. This is accomplished by redisplaying the button
-several times, alternating between the configured activebackground
-and background colors. At the end of the flash the button is left
-in the same normal/active state as when the command was invoked.
-This command is ignored if the button's state is \fBdisabled\fR.
-.TP
-\fIpathName \fBinvoke\fR
-Invoke the Tcl command associated with the button, if there is one.
-The return value is the return value from the Tcl command, or an
-empty string if there is no command associated with the button.
-This command is ignored if the button's state is \fBdisabled\fR.
-.SH "DEFAULT BINDINGS"
-.PP
-Tk automatically creates class bindings for buttons that give them
-default behavior:
-.IP [1]
-A button activates whenever the mouse passes over it and deactivates
-whenever the mouse leaves the button.
-Under Windows, this binding is only active when mouse button 1 has
-been pressed over the button.
-.IP [2]
-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.
-.IP [3]
-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.
-.IP [4]
-When a button has the input focus, the space key causes the button
-to be invoked.
-.PP
-If the button's state is \fBdisabled\fR then none of the above
-actions occur: the button is completely non-responsive.
-.PP
-The behavior of buttons can be changed by defining new bindings for
-individual widgets or by redefining the class bindings.
-.SH "PLATFORM NOTES"
-.PP
-On Aqua/Mac OS X, some configuration options are ignored for the purpose of
-drawing of the widget because they would otherwise conflict with platform
-guidelines. The \fBconfigure\fR and \fBcget\fR subcommands can still
-manipulate the values, but do not cause any variation to the look of the
-widget. The options affected notably include \fB\-background\fR and
-\fB\-relief\fR.
-.SH EXAMPLES
-.PP
-This is the classic Tk
-.QW "Hello, World!"
-demonstration:
-.PP
-.CS
-\fBbutton\fR .b \-text "Hello, World!" \-command exit
-pack .b
-.CE
-.PP
-This example demonstrates how to handle button accelerators:
-.PP
-.CS
-\fBbutton\fR .b1 \-text Hello \-underline 0
-\fBbutton\fR .b2 \-text World \-underline 0
-bind . <Key\-h> {.b1 flash; .b1 invoke}
-bind . <Key\-w> {.b2 flash; .b2 invoke}
-pack .b1 .b2
-.CE
-.SH "SEE ALSO"
-ttk::button(n)
-.SH KEYWORDS
-button, widget
-'\" Local Variables:
-'\" mode: nroff
-'\" End: