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- '\" $Header: /user6/ouster/wish/man/RCS/button.n,v 1.19 93/04/01 09:52:31 ouster Exp $ SPRITE (Berkeley)
- '/"
- .\" The definitions below are for supplemental macros used in Tcl/Tk
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- .HS button tk
- .BS
- '\" Note: do not modify the .SH NAME line immediately below!
- .SH NAME
- button \- Create and manipulate button widgets
- .SH SYNOPSIS
- \fBbutton\fI \fIpathName \fR?\fIoptions\fR?
- .SH "STANDARD OPTIONS"
- .LP
- .nf
- .ta 4c 8c 12c
- .VS
- \fBactiveBackground\fR \fBbitmap\fR \fBfont\fR \fBrelief\fR
- \fBactiveForeground\fR \fBborderWidth\fR \fBforeground\fR \fBtext\fR
- \fBanchor\fR \fBcursor\fR \fBpadX\fR \fBtextVariable\fR
- \fBbackground\fR \fBdisabledForeground\fR \fBpadY\fR
- .VE
- .fi
- .LP
- See the ``options'' manual entry for details on the standard options.
- .SH "WIDGET-SPECIFIC OPTIONS"
- .ta 4c
- .LP
- .nf
- Name: \fBcommand\fR
- Class: \fBCommand\fR
- Command-Line Switch: \fB\-command\fR
- .fi
- .IP
- Specifies a Tcl command to associate with the button. This command
- is typically invoked when mouse button 1 is released over the button
- window.
- .LP
- .nf
- .VS
- Name: \fBheight\fR
- Class: \fBHeight\fR
- Command-Line Switch: \fB\-height\fR
- .fi
- .IP
- Specifies a desired height for the button.
- If a 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 isn't specified, the button's desired height is computed
- from the size of the bitmap or text being displayed in it.
- .LP
- .nf
- Name: \fBstate\fR
- Class: \fBState\fR
- Command-Line Switch: \fB\-state\fR
- .fi
- .IP
- Specifies one of three states for the button: \fBnormal\fR, \fBactive\fR,
- or \fBdisabled\fR. In normal state the button is displayed using the
- \fBforeground\fR and \fBbackground\fR options. The active state is
- typically used when the pointer is over the button. In active state
- the button is displayed using the \fBactiveForeground\fR and
- \fBactiveBackground\fR options. Disabled state means that the button
- is insensitive: it doesn't activate and doesn't respond to mouse
- button presses. In this state the \fBdisabledForeground\fR and
- \fBbackground\fR options determine how the button is displayed.
- .LP
- .nf
- Name: \fBwidth\fR
- Class: \fBWidth\fR
- Command-Line Switch: \fB\-width\fR
- .fi
- .IP
- Specifies a desired width for the button.
- If a 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 characters.
- If this option isn't specified, the button's desired width is computed
- from the size of the bitmap or text being displayed in it.
- .VE
- .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
- .VS
- that displays a textual string or bitmap.
- It can display itself in either of three different ways, according
- to
- the \fBstate\fR option;
- .VE
- 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:
- .DS C
- \fIpathName option \fR?\fIarg arg ...\fR?
- .DE
- \fIOption\fR and the \fIarg\fRs
- determine the exact behavior of the command. The following
- commands are possible for button widgets:
- .TP
- \fIpathName \fBactivate\fR
- Change the button's state to \fBactive\fR and redisplay the button
- using its active foreground and background colors instead of normal
- colors.
- .VS
- This command is ignored if the button's state is \fBdisabled\fR.
- This command is obsolete and will eventually be removed;
- use ``\fIpathName \fBconfigure \-state active\fR'' instead.
- .VE
- .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 \fBdeactivate\fR
- Change the button's state to \fBnormal\fR and redisplay the button
- using its normal foreground and background colors.
- .VS
- This command is ignored if the button's state is \fBdisabled\fR.
- This command is obsolete and will eventually be removed;
- use ``\fIpathName \fBconfigure \-state normal\fR'' instead.
- .VE
- .TP
- \fIpathName \fBflash\fR
- 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 command was invoked.
- .VS
- This command is ignored if the button's state is \fBdisabled\fR.
- .VE
- .TP
- \fIpathName \fBinvoke\fR
- .VS
- 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.
- .VE
-
- .SH "DEFAULT BINDINGS"
- .PP
- .VS
- Tk automatically creates class bindings for buttons that give them
- the following default behavior:
- .IP [1]
- The button activates whenever the mouse passes over it and deactivates
- whenever the mouse leaves the button.
- .IP [2]
- The 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 the 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.
- .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.
- .VE
-
- .SH KEYWORDS
- button, widget
-