radiobutton(3Tk) radiobutton(3Tk)
radiobutton - Create and manipulate radiobutton widgets
radiobutton pathName ?options?
activeBackground cursor highlightThickness takeFocus |
activeForeground disabledForeground image text |
anchor font justify textVariable |
background foreground padX underline |
bitmap highlightColor padY wrapLength |
borderWidth highlightBackground relief
See the ``options'' manual entry for details on the standard options.
WIDGET-SPECIFIC OPTIONS
Name: command
Class: Command
Command-Line Switch:-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. The button's global variable (-variable option) will be
updated before the command is invoked.
Name: height
Class: Height
Command-Line Switch:-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 Tk_GetPixels); 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.
Name: indicatorOn |
Class: IndicatorOn |
Command-Line Switch:-indicatoron |
Specifies whether or not the indicator should be drawn. Must be a |
proper boolean value. If false, the relief option is ignored and |
the widget's relief is always sunken if the widget is selected and |
raised otherwise.
Name: selectColor |
Class: Background |
Command-Line Switch:-selectcolor |
Page 1
radiobutton(3Tk) radiobutton(3Tk)
Specifies a background color to use when the button is selected. If|
indicatorOn is true, the color applicies to the indicator. If |
indicatorOn is false, this color is used as the background for the |
entire widget, in place of background or activeBackground, whenever |
the widget is selected. If specified as an empty string, no special|
color is used for displaying when the widget is selected.
Name: selectImage |
Class: SelectImage |
Command-Line Switch:-selectimage |
Specifies an image to display (in place of the image option) when |
the radiobutton is selected. This option is ignored unless the |
image option has been specified.
Name: state
Class: State
Command-Line Switch:-state
Specifies one of three states for the radiobutton: normal, active,
or disabled. In normal state the radiobutton is displayed using the
foreground and background options. The active state is typically
used when the pointer is over the radiobutton. In active state the
radiobutton is displayed using the activeForeground and
activeBackground options. Disabled state means that the radiobutton|
should be insensitive: the default bindings will refuse to activate|
the widget and will ignore mouse button presses. In this state the
disabledForeground and background options determine how the
radiobutton is displayed.
Name: value
Class: Value
Command-Line Switch:-value
Specifies value to store in the button's associated variable
whenever this button is selected.
Name: variable
Class: Variable
Command-Line Switch:-variable
Specifies name of global variable to set whenever this button is
selected. Changes in this variable also cause the button to select
or deselect itself. Defaults to the value selectedButton.
Name: width
Class: Width
Command-Line Switch:-width
Specifies a desired width for the button. If an image or bitmap is
being displayed in the button, the value is in screen units (i.e.
any of the forms acceptable to Tk_GetPixels); for text it is in
Page 2
radiobutton(3Tk) radiobutton(3Tk)
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.
The radiobutton command creates a new window (given by the pathName
argument) and makes it into a radiobutton widget. Additional options,
described above, may be specified on the command line or in the option
database to configure aspects of the radiobutton such as its colors,
font, text, and initial relief. The radiobutton command returns its
pathName argument. At the time this command is invoked, there must not
exist a window named pathName, but pathName's parent must exist.
A radiobutton is a widget that displays a textual string, bitmap or image|
and a diamond called an indicator. 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 wrapLength option)|
and one of the characters may optionally be underlined using the |
underline option. A radiobutton has all of the behavior of a simple
button: it can display itself in either of three different ways,
according to the state option; it can be made to appear raised, sunken,
or flat; it can be made to flash; and it invokes a Tcl command whenever
mouse button 1 is clicked over the check button.
In addition, radiobuttons can be selected. If a radiobutton is selected,|
the indicator is normally drawn with a sunken relief and a special color,|
and a Tcl variable associated with the radiobutton is set to a particular|
value. If the radiobutton is not selected, the indicator is drawn with a|
raised relief and no special color. Typically, several radiobuttons |
share a single variable and the value of the variable indicates which |
radiobutton is to be selected. When a radiobutton is selected it sets |
the value of the variable to indicate that fact; each radiobutton also |
monitors the value of the variable and automatically selects and |
deselects itself when the variable's value changes. By default the |
variable selectedButton is used; its contents give the name of the |
button that is selected, or the empty string if no button associated with|
that variable is selected. The name of the variable for a radiobutton, |
plus the variable to be stored into it, may be modified with options on |
the command line or in the option database. Configuration options may |
also be used to modify the way the indicator is displayed (or whether it |
is displayed at all). By default a radio button is configured to select
itself on button clicks.
The radiobutton command creates a new Tcl command whose name is pathName.
This command may be used to invoke various operations on the widget. It
has the following general form:
pathName option ?arg arg ...?
Page 3
radiobutton(3Tk) radiobutton(3Tk)
Option and the args determine the exact behavior of the command. The
following commands are possible for radiobutton widgets:
pathName cget option
Returns the current value of the configuration option given by |
option. Option may have any of the values accepted by the |
radiobutton command.
pathName configure ?option? ?value option value ...?
Query or modify the configuration options of the widget. If no
option is specified, returns a list describing all of the available
options for pathName (see Tk_ConfigureInfo for information on the
format of this list). If option is specified with no value, 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 option is specified). If one or more option-value pairs are
specified, the command modifies the given widget option(s) to have
the given value(s); in this case the command returns an empty
string. Option may have any of the values accepted by the
radiobutton command.
pathName deselect
Deselects the radiobutton and sets the associated variable to an
empty string. If this radiobutton was not currently selected, the
command has no effect.
pathName flash
Flashes the radiobutton. This is accomplished by redisplaying the
radiobutton several times, alternating between active and normal
colors. At the end of the flash the radiobutton is left in the same
normal/active state as when the command was invoked. This command
is ignored if the radiobutton's state is disabled.
pathName invoke
Does just what would have happened if the user invoked the
radiobutton with the mouse: selects the button and invokes its
associated Tcl command, 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 radiobutton. This command is ignored if
the radiobutton's state is disabled.
pathName select
Selects the radiobutton and sets the associated variable to the
value corresponding to this widget.
Tk automatically creates class bindings for radiobuttons that give them
the following default behavior:
Page 4
radiobutton(3Tk) radiobutton(3Tk)
[1] The radiobutton activates whenever the mouse passes over it and
deactivates whenever the mouse leaves the radiobutton.
[2] When mouse button 1 is pressed over a radiobutton it is invoked (it |
becomes selected and the command associated with the button is |
invoked, if there is one).
[3] When a radiobutton has the input focus, the space key causes the |
radiobutton to be invoked.
If the radiobutton's state is disabled then none of the above actions
occur: the radiobutton is completely non-responsive.
The behavior of radiobuttons can be changed by defining new bindings for
individual widgets or by redefining the class bindings.
radiobutton, widget
PPPPaaaaggggeeee 5555 [ Back ]
|
