"

 COPYRIGHT (c) 1994 by Claus Gittinger

	      All Rights Reserved

 This software is furnished under a license and may be used

 only in accordance with the terms of that license and with the

 inclusion of the above copyright notice.   This software may not

 be provided or otherwise made available to, or used by, any

 other person.  No title to or ownership of the software is

 hereby transferred.

"

'From Smalltalk/X, Version:2.10.3 on 27-sep-1994 at 12:56:30'!

HorizontalScrollBar subclass:#HorizontalSteppingSlider

	 instanceVariableNames:'stepIncrement'

	 classVariableNames:''

	 poolDictionaries:''

	 category:'Views-Interactors'

!

!HorizontalSteppingSlider class methodsFor:'documentation'!

copyright

"

 COPYRIGHT (c) 1994 by Claus Gittinger

	      All Rights Reserved

 This software is furnished under a license and may be used

 only in accordance with the terms of that license and with the

 inclusion of the above copyright notice.   This software may not

 be provided or otherwise made available to, or used by, any

 other person.  No title to or ownership of the software is

 hereby transferred.

"

!

version

!

documentation

"

    HorizontalSteppingSliders are like HorizontalSliders, but add step-up and step-down

    buttons (which increment/decrement the value).

"

!

examples 

"

    |top sl|

    top := StandardSystemView extent:200@200.

    sl := HorizontalSteppingSlider in:top.

    sl origin:(0.0@0.0) corner:(1.0@sl height).

    sl scrollAction:[:pos | Transcript showCr:pos].    

    top open

"

! !

!HorizontalSteppingSlider methodsFor:'initialization'!

createElements

    button1 := ArrowButton leftIn:self.

    button1 name:'LeftButton'.

    button2 := ArrowButton rightIn:self.

    button2 name:'RightButton'.

    thumb := HorizontalSlider in:self.

!

initialize

    super initialize.

    stepIncrement := 1.

    self scrollDownAction:[self scrollStepUp].

    self scrollUpAction:[self scrollStepDown].

! !

!HorizontalSteppingSlider methodsFor:'accessing'!

model:aModel

    thumb model:aModel

!

stepIncrement:aNumber 

    "set the value used for stepping (defaults to 1)"

    stepIncrement := aNumber

!

step:aNumber

    "same as stepIncrement;

     set the value used for stepping (defaults to 1)"

    stepIncrement := aNumber

!

step

    ^ stepIncrement

!

start:start stop:stop step:step

    thumb start:start stop:stop.

    stepIncrement := step

! !

!HorizontalSteppingSlider methodsFor:'events'!

keyPress:key x:x y:y

    key == #CursorRight ifTrue:[

	self scrollStepUp.

	^ self

    ].

    key == #CursorLeft ifTrue:[

	self scrollStepDown.

	^ self

    ].

    super keyPress:key x:x y:y

! !

!HorizontalSteppingSlider methodsFor:'private'!

scrollStepUp

    |nO|

    nO := (thumb thumbOrigin + stepIncrement) min:thumb stop.         

    thumb thumbOrigin:nO.

    thumb tellOthers.

!

scrollStepDown

    |nO|

    nO := (thumb thumbOrigin - stepIncrement) max:thumb start.

    thumb thumbOrigin:nO.

    thumb tellOthers.

! !

!HorizontalSteppingSlider methodsFor:'misc'!

doesNotUnderstand:aMessage

    ^ aMessage sendTo:thumb 

! !