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Class: TriggerBox

Inheritance:

   Object
   |
   +--GraphicsMedium
      |
      +--DisplaySurface
         |
         +--SimpleView
            |
            +--PanelView
               |
               +--HorizontalPanelView
                  |
                  +--CheckBox
                     |
                     +--TriggerBox
Package:
stx:libwidg2
Category:
Views-Interactors
Version:
rev: 1.4 date: 2017/11/28 18:27:39
user: cg
file: TriggerBox.st directory: libwidg2
module: stx stc-classLibrary: libwidg2

Description:


A TriggerBox looks similar to a CheckBox (it contains a button and a label),
but does not show a check-icon.
Instead, a trigger button (unlabelled) performs a momentary action when pressed.

Instance protocol:

accessing-channels
o  triggerChannel: aValueHolder

initialization & release
o  defaultCheckToggleClass
Button

o  defaultControllerClass

o  initialize
must be called if redefined

Examples:


no-op TriggerBox without a label: 
   |b|

   b := TriggerBox new.
   b open
no-op TriggerBox: 
   |b|

   b := TriggerBox new.
   b label:'foo'.
   b open
combined instance creation & label setup: 
   |b|

   b := TriggerBox label:'foo'.
   b open
no-op trigger, disabled: 
   |b|

   b := TriggerBox label:'foo'.
   b disable.
   b open
using a trigger channel instead of a callback: 
   |b holder|

   holder := TriggerValue new.
   holder onChangeEvaluate:[ Transcript showCR:'changed'].
   b := TriggerBox label:'foo'.
   b triggerChannel:holder.
   b open
changing colors 
   |panel b|

   panel := VerticalPanelView new.

   b := TriggerBox label:'foo' in:panel.

   b := TriggerBox label:'bar' in:panel.
   b labelView foregroundColor:Color red.

   b := TriggerBox label:'baz' in:panel.
   b toggleView activeForegroundColor:Color blue.

   panel open
using action-blocks: 
   |b|

   b := TriggerBox label:'check'.
   b action:[:value | Transcript show:'trigger called: '].
   b open.
with an enableChannel 
   |b enaToggle enaHolder|

   enaHolder := true asValue.

   enaToggle := Toggle label:'enable'.
   enaToggle model:enaHolder.
   enaToggle open.

   b := TriggerBox label:'check'.
   b action:[:value | Transcript showCR:'triggered'].
   b enableChannel:enaHolder.
   b open.

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