Widget

NAME: Widget - The Widget base class for BWidget
DESCRIPTION
COMMANDS: Slab::Widget::addmap class subclass subpath options; Slab::Widget::bwinclude class subclass subpath ?arg...?; Slab::Widget::cget path option; Slab::Widget::configure path options; Slab::Widget::create class path ?rename?; Slab::Widget::declare class optlist; Slab::Widget::define class filename ?class ...?; Slab::Widget::destroy path; Slab::Widget::getoption path option; Slab::Widget::getVariable path varName ?myVarName?; Slab::Widget::hasChanged path option pvalue; Slab::Widget::init class path options; Slab::Widget::setoption path option value; Slab::Widget::subcget path subwidget; Slab::Widget::tkinclude class tkwidget subpath ?arg...?
OTHER COMMANDS in the Slab::Widget namespace, documented on the Utilities page.: Slab::Widget::focusNext w; Slab::Widget::focusOK w; Slab::Widget::focusPrev w; Slab::Widget::traverseTo w; Slab::Widget::theme ?bool?

NAME

Widget - The Widget base class for BWidget

DESCRIPTION

Under construction ...

The Slab::Widget namespace handles data associated to all BWidgets and provides commands to easily define a BWidget. It is retained in Slab for use by the widgets that have not yet been ported to Snit. It also includes general-purpose Utilities that are used by Slab widgets that have been ported to Snit.
Four commands can be used to define a BWidget: tkinclude, bwinclude, declare, and addmap. Here is the definition of ComboBox widget:

namespace eval ComboBox {
    # We're using ArrowButton, Entry and LabelFrame
    ArrowButton::use
    Entry::use
    LabelFrame::use

    # Include resources of LabelFrame
    Slab::Widget::bwinclude ComboBox LabelFrame .labf \ 
        rename     {-text -label} \ 
        remove     {-focus} \ 
        prefix     {label -justify -width -anchor -height -font} \ 
        initialize {-relief sunken -borderwidth 2}

    # Include resources of Entry
    Slab::Widget::bwinclude ComboBox Entry .e \ 
        remove {-relief -bd -borderwidth -bg -fg} \ 
        rename {-foreground -entryfg -background -entrybg}

    # Declare new resources
    Slab::Widget::declare ComboBox {
        {-height      TkResource 0  0 listbox}
        {-values      String     "" 0}
        {-modifycmd   String     "" 0}
        {-postcommand String     "" 0}
    }

    # Map resources to subwidget
    Slab::Widget::addmap ComboBox "" :cmd {-background {}}
    Slab::Widget::addmap ComboBox ArrowButton .a \ 
        {-foreground {} -background {} -disabledforeground {} -state {}}

    proc use {} {}
}

COMMAND

Slab::Widget::addmap class subclass subpath options

This command map some resources to subwidget. Mapped resources automatically configure subwidget when widget is configured.

class is the class of the new BWidget
subclass is the class the subwidget (BWidget class, e.g Entry, or empty for Tk widget)
subpath is the path of the subwidget
options is the list {option realres ...} of options to map to subwidget

Slab::Widget::bwinclude class subclass subpath ?arg...?

This command includes into a new BWidget the resources of another BWidget. Arguments are:

class class of the new widget
subclass class name of the BWidget to be included
subpath path of the widget to configure when BWidget is configured
options is:
- include {option option ...}
  list of options to include (all if not defined)
- remove {option option ...}
  list of options to remove
- rename {option name option name ...}
  list of options to rename
- prefix {prefix option option ...}
  pefix all option by prefix
- initialize {option value option value ...}
  default value of options
- readonly {option value option value ...}
  new readonly flag

Slab::Widget::cget path option

Returns the value of option of BWidget path. cget tests the option existence and takes care of synchronization with subwidget. Typically called by the BWidget cget command.

Slab::Widget::configure path options

Description text

Slab::Widget::create class path ?rename?

The standard method for creating a BWidget. The real widget path is renamed to $path:cmd, and a new proc is created to replace the path which points to the BWidget's commands.

If rename is false, the path will not be renamed, but the proc will still be created. This is useful when inheriting another BWidget who will already have renamed the widget.

The command returns the widget path. This command is usually the last command executed in the ::create command for the widget.

Slab::Widget::declare class optlist

This command declare new resources for a BWidget.

class is class of the new widget
options is the list describing new options. Each new option is a list {option type value ro ?args?} where:
- option is the name of the option
- type is the type of the option
- value is the default value of the option
- ro is the readonly flag of the option
- args depends on type

type can be:

TkResource: value of option denotes a resource of a Tk widget. args must be class or {class realoption}. class is the creation command of the Tk widget, e.g. entry. The second form must be used if option has not the same name in Tk widget, but realoption.
If value is empty, it is initialized to the default value of the Tk widget.
BwResource: value of option denotes a resource of a BWidget. args must be class or {class realoption}. class is the name of the namespace of the BWidget, e.g. LabelFrame. The second form must be used if option has not the same name in BWidget, but realoption.
If value is empty, it is initialized to the default value of the BWidget.
Int: value of option is an integer. args can be {?min? ?max?} to force it to be in a range. The test is [expr $option > $min] && [expr $option < $max] so if args is {0 10}, value must be beetween 0 and 10 exclude, if args is {=0 =10} , value must be beetween 0 and 10 include.
Boolean: value of option is a boolean. True values can be 1, true or yes. False values can be 0, false or no. Slab::Widget::cget always return 0 or 1.
Enum: value of option is a element of a enumeration. args must be the list of enumeration, e.g. {top left bottom right}.
Flag: value of option is a combination of a set of chars. args must be a string defining the set.
String: value of option is any uncontrolled string.
Synonym: option is a synonym of option args. value has no effect here.

Slab::Widget::define class filename ?class ...?

This command is used to define a new BWidget class. It is usually the first command executed in a new widget definition.

class is the name of the new widget class.
filename is the name of the file (without extension) in the BWidget distribution that defines this class.
?-classonly? If present, the class is not setup.
?-namespace ns? The namespace where the widget's procedures live in; defaults to the class name.

Each class defined after the filename is a class that this widget depends on. The ::use command will be called for each of these classes after the new widget has been defined.

If -classonly option is not given this command does several things to setup the new class. First, it creates an alias in the global namespace for the name of the class that points to the class's ::create subcommand. Second, it defines a ::use subcommand for the class which other classes can use to load this class on the fly. Lastly, it creates a default binding to the <Destroy> event for the class that calls Slab::Widget::destroy on the path. This is the default setup for almost all widgets in the BWidget package.

Slab::Widget::destroy path

Description text

Slab::Widget::getoption path option

Returns the value of option of BWidget path. This command does not test option existence, does not handle synonym and does not take care of synchronization with subwidget.

Slab::Widget::getVariable path varName ?myVarName?

Make the variable varName relational to path accessible in the current procedure. The variable will be created in the widget namespace for path and can be used for storing widget-specific information. When path is destroyed, any variable accessed in this manner will be destroyed with it.

If myVarName is specified, the variable will be accessible in the current procedure as that name.

Slab::Widget::hasChanged path option pvalue

Description text

Slab::Widget::init class path options

Description text

Slab::Widget::setoption path option value

Set the value of option of BWidget path without option test, subwidget mapping, synonym handling and does not set the modification flag.

Slab::Widget::subcget path subwidget

Returns the list of all option/value of BWidget path that are mapped to subwidget.

Slab::Widget::tkinclude class tkwidget subpath ?arg...?

This command includes into a new BWidget the resources of a Tk widget. Arguments are:

class class of the new widget
tkwidget command name of the Tk widget to be included
subpath path of the widget to configure when BWidget is configured
options is:
- include {option option ...}
  list of options to include (all if not defined)
- remove {option option ...}
  list of options to remove
- rename {option name option name ...}
  list of options to rename
- prefix {prefix option option ...}
  pefix all option by prefix
- initialize {option value option value ...}
  default value of options
- readonly {option value option value ...}
  new readonly flag