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"
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COPYRIGHT (c) 1989-93 by Claus Gittinger
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All Rights Reserved
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This software is furnished under a license and may be used
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only in accordance with the terms of that license and with the
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inclusion of the above copyright notice. This software may not
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be provided or otherwise made available to, or used by, any
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other person. No title to or ownership of the software is
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hereby transferred.
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"
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ScrollBar subclass:#HorizontalScrollBar
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instanceVariableNames:''
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classVariableNames:'defaultScrollRightForm
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defaultScrollLeftForm'
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poolDictionaries:''
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category:'Views-Interactors'
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!
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HorizontalScrollBar comment:'
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COPYRIGHT (c) 1989-93 by Claus Gittinger
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All Rights Reserved
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this class implements horizontal scrollbars with scroller and
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2 step-scroll buttons. when moved or stepped, it perform a
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predefined action.
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%W% %E%
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written spring/summer 89 by claus
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'!
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!HorizontalScrollBar class methodsFor:'defaults'!
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scrollLeftButtonForm:style
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defaultScrollLeftForm isNil ifTrue:[
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defaultScrollLeftForm := Form fromFile:(Resources at:'LEFT_BUTTON_FORM_FILE'
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default:(style == #mswindows
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ifTrue:['ScrollLt_win.xbm']
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ifFalse:['ScrollLt.xbm']))
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resolution:100
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].
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defaultScrollLeftForm isNil ifTrue:[
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defaultScrollLeftForm :=
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Form width:16 height:16 fromArray:#(2r00000000 2r00000000
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2r00000001 2r10000000
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2r00000010 2r10000000
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2r00000100 2r10000000
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2r00001000 2r11111110
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2r00010000 2r00000010
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2r00100000 2r00000010
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2r01000000 2r00000010
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2r01000000 2r00000010
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2r00100000 2r00000010
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2r00010000 2r00000010
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2r00001000 2r11111110
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2r00000100 2r10000000
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2r00000010 2r10000000
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2r00000001 2r10000000
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2r00000000 2r00000000)
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].
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^ defaultScrollLeftForm
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!
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scrollRightButtonForm:style
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defaultScrollRightForm isNil ifTrue:[
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defaultScrollRightForm := Form fromFile:(Resources at:'RIGHT_BUTTON_FORM_FILE'
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default:(style == #mswindows
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ifTrue:['ScrollRt_win.xbm']
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ifFalse:['ScrollRt.xbm']))
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resolution:100
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].
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defaultScrollRightForm isNil ifTrue:[
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defaultScrollRightForm :=
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Form width:16 height:16 fromArray:#(2r00000000 2r00000000
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2r00000001 2r10000000
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2r00000001 2r01000000
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2r00000001 2r00100000
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2r01111111 2r00010000
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2r01000000 2r00001000
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2r01000000 2r00000100
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2r01000000 2r00000010
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2r01000000 2r00000010
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2r01000000 2r00000100
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2r01000000 2r00001000
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2r01111111 2r00010000
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2r00000001 2r00100000
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2r00000001 2r01000000
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2r00000001 2r10000000
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2r00000000 2r00000000)
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].
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^ defaultScrollRightForm
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! !
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!HorizontalScrollBar methodsFor:'initialization'!
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initialize
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|bwn sep h w leftForm rightForm|
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super initialize.
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"compute my extent from sub-components"
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leftForm := self class scrollLeftButtonForm:style.
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rightForm := self class scrollRightButtonForm:style.
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w := leftForm width + rightForm width
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+ (1 "self defaultBorderWidth" * 2)
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+ (HorizontalScroller defaultExtent x).
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h := (leftForm height) max:(rightForm height).
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self is3D ifTrue:[
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h := h + 4.
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w := w + 4
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].
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self extent:w @ h.
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style == #mswindows ifTrue:[
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layout := #around
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] ifFalse:[
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layout := defaultLayout
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].
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bwn := borderWidth negated.
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self is3D ifTrue:[
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sep := 1
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] ifFalse:[
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sep := 0
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].
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button1 form:(self class scrollLeftButtonForm:style).
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button1 name:'LeftButton'.
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button1 borderWidth:borderWidth.
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button1 autoRepeat.
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button2 form:(self class scrollRightButtonForm:style).
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button2 name:'RightButton'.
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button2 borderWidth:borderWidth.
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button2 autoRepeat.
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"poor design - destroy thumb and re-create a HScroller for it"
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thumb destroy.
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thumb := HorizontalScroller in:self.
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thumb borderWidth:borderWidth.
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(layout == #bottom) ifTrue:[
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"buttons at left"
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button1 origin:(bwn @ bwn).
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button1 viewGravity:#West.
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button2 origin:(button1 width @ bwn).
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button2 viewGravity:#West.
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thumb origin:((button1 width + borderWidth + button2 width + sep + sep) @ bwn).
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thumb viewGravity:#West
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] ifFalse:[
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(layout == #top) ifTrue:[
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"buttons at right"
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button1 viewGravity:#West.
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button2 viewGravity:#West.
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thumb origin:(bwn @ bwn).
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thumb viewGravity:#West
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] ifFalse:[
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button1 origin:(bwn @ bwn).
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button1 viewGravity:#West.
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button2 viewGravity:#West.
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thumb origin:((button1 width + sep) @ bwn).
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thumb viewGravity:#West
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]
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]
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! !
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!HorizontalScrollBar methodsFor:'accessing'!
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scrollLeftAction:aBlock
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button1 action:aBlock
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!
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scrollRightAction:aBlock
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button2 action:aBlock
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! !
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!HorizontalScrollBar methodsFor:'events'!
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sizeChanged:how
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|leftWidth rightWidth thumbWidth leftAndRightWidth bwn sep sep2|
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button1 isNil ifTrue:[^ self].
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button2 isNil ifTrue:[^ self].
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thumb isNil ifTrue:[^ self].
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leftWidth := button1 width + borderWidth.
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rightWidth := button2 width + borderWidth.
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leftAndRightWidth := leftWidth + rightWidth.
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bwn := borderWidth negated.
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self is3D ifTrue:[
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sep := 1
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] ifFalse:[
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sep := 0
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].
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thumbWidth := width - leftAndRightWidth - borderWidth - (sep * 3).
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((layout ~~ #top) and:[layout ~~ #bottom]) ifTrue:[
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thumbWidth := thumbWidth - borderWidth
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].
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"if I become too small, hide buttons"
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(width < leftAndRightWidth) ifTrue:[
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button1 shown ifTrue:[
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button1 hidden.
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button2 hidden.
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thumb hidden
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]
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] ifFalse:[
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shown ifTrue:[
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button1 shown ifFalse:[
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button1 show.
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button2 show.
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thumb show
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]
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]
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].
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(thumbWidth < 10) ifTrue:[
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thumb shown ifTrue:[
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thumb hidden
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]
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] ifFalse:[
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thumb shown ifFalse:[
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button1 shown ifTrue:[
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thumb show
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]
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]
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].
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"height of buttons is always my width"
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(height ~~ button1 height) ifTrue:[
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button1 height:height.
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button2 height:height
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].
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"thumb height:height. "
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(layout == #bottom) ifTrue:[
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"buttons at left"
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thumb extent:(thumbWidth @ height).
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^ self
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].
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sep2 := sep * 2.
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(layout == #top) ifTrue:[
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"buttons at right"
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(how == #smaller) ifTrue:[
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thumb extent:(thumbWidth @ height).
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button1 origin:((thumbWidth + sep2) @ bwn).
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button2 origin:((thumbWidth + sep2 + leftWidth) @ bwn)
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] ifFalse:[
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button1 origin:((thumbWidth + sep2) @ bwn).
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button2 origin:((thumbWidth + sep2 + leftWidth) @ bwn).
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thumb extent:(thumbWidth @ height)
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].
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^ self
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].
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"button around thumb"
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button2 origin:((leftWidth + thumbWidth + sep2) @ bwn).
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thumb extent:(thumbWidth @ height).
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thumb origin:((leftWidth - borderWidth + sep) @ bwn)
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! !
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