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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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View subclass:#ScrollBar
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instanceVariableNames:'thumb button1 button2 layout'
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classVariableNames:'defaultScrollUpForm
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3
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defaultScrollDownForm'
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0
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poolDictionaries:''
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category:'Views-Interactors'
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!
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ScrollBar 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 vertical scrollbars with scroller and
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2 step-scroll buttons. when moved or stepped, it performs a
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predefined action.
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3
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$Header: /cvs/stx/stx/libwidg/ScrollBar.st,v 1.2 1993-10-13 01:03:34 claus Exp $
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written spring/summer 89 by claus
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'!
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!ScrollBar class methodsFor:'defaults'!
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scrollUpButtonForm:style
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"answer the form used for the scrollUp Button"
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defaultScrollUpForm isNil ifTrue:[
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3
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defaultScrollUpForm := Form fromFile:(self classResources at:'SCROLL_UP_BUTTON_FORM_FILE'
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0
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default:(style == #mswindows
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ifTrue:['ScrollUp_win.xbm']
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ifFalse:['ScrollUp.xbm'])
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)
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resolution:100
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].
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defaultScrollUpForm isNil ifTrue:[
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defaultScrollUpForm := Form width:16 height:16
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fromArray:#(2r00000000 2r00000000
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2r00000001 2r10000000
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2r00000010 2r01000000
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2r00000100 2r00100000
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2r00001000 2r00010000
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2r00010000 2r00001000
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2r00100000 2r00000100
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2r01000000 2r00000010
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2r01111000 2r00011110
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2r00001000 2r00010000
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2r00001000 2r00010000
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2r00001000 2r00010000
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2r00001000 2r00010000
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2r00001000 2r00010000
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2r00001111 2r11110000
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2r00000000 2r00000000)
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].
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^ defaultScrollUpForm
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!
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scrollDownButtonForm:style
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"retun the form used for the scrollDown Button"
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defaultScrollDownForm isNil ifTrue:[
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defaultScrollDownForm := Form fromFile:(self classResources at:'SCROLL_DOWN_BUTTON_FORM_FILE'
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0
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default:(style == #mswindows
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ifTrue:['ScrollDn_win.xbm']
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ifFalse:['ScrollDn.xbm'])
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)
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resolution:100
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].
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defaultScrollDownForm isNil ifTrue:[
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defaultScrollDownForm := Form width:16 height:16
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fromArray:#(2r00000000 2r00000000
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2r00001111 2r11110000
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2r00001000 2r00010000
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2r00001000 2r00010000
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2r00001000 2r00010000
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2r00001000 2r00010000
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2r00001000 2r00010000
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2r01111000 2r00011110
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2r01000000 2r00000010
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2r00100000 2r00000100
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2r00010000 2r00001000
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2r00001000 2r00010000
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2r00000100 2r00100000
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2r00000010 2r01000000
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2r00000001 2r10000000
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2r00000000 2r00000000)
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].
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^ defaultScrollDownForm
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! !
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!ScrollBar class methodsFor:'style changes'!
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styleChange
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defaultScrollUpForm := nil.
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defaultScrollDownForm := nil
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"ScrollBar styleChange"
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! !
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!ScrollBar methodsFor:'initialization'!
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initialize
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"setup; create the 2 buttons and a scroller"
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|bwn sep w h upForm downForm c default|
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super initialize.
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"compute my extent from sub-components"
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3
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upForm := self class scrollUpButtonForm:style.
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downForm := self class scrollDownButtonForm:style.
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3
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h := upForm height + downForm height +
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(1 "self defaultBorderWidth" * 2) + (Scroller defaultExtent y).
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w := (upForm width) max:(downForm width).
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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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bwn := borderWidth negated + margin.
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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 := "Button form:(self class scrollUpButtonForm:style) in:self."
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ArrowButton upIn:self.
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button1 name:'UpButton'.
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button1 borderWidth:borderWidth.
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button1 autoRepeat.
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thumb := Scroller in:self.
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style ~~ #next ifTrue:[
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thumb borderWidth:borderWidth.
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].
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button2 := "Button form:(self class scrollDownButtonForm:style) in:self."
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ArrowButton downIn:self.
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button2 name:'DownButton'.
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button2 borderWidth:borderWidth.
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button2 autoRepeat.
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((style == #iris) and:[Display hasGreyscales])ifTrue:[
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"have to change some of Buttons defaults"
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c := (Color grey:25) on:device.
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button1 offLevel:2.
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button2 offLevel:2.
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button1 foregroundColor:c.
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button1 activeForegroundColor:c.
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button1 enteredForegroundColor:c.
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button2 foregroundColor:c.
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button2 activeForegroundColor:c.
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button2 enteredForegroundColor:c.
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].
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(layout == #top) ifTrue:[
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button1 origin:(bwn @ bwn).
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button1 viewGravity:#North.
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button2 origin:(bwn @ (button1 height)).
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button2 viewGravity:#North.
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thumb origin:(bwn @ (button1 height + borderWidth + button2 height + sep + sep)).
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thumb viewGravity:#North
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] ifFalse:[
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(layout == #bottom) ifTrue:[
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button1 viewGravity:#North.
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button2 viewGravity:#North.
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thumb origin:(bwn @ bwn).
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thumb viewGravity:#North
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] ifFalse:[
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button1 origin:(bwn @ bwn).
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button1 viewGravity:#North.
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button2 viewGravity:#North.
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thumb origin:(bwn @ (button1 height + sep)).
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thumb viewGravity:#North
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]
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]
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3
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!
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initStyle
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|upForm downForm default|
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super initStyle.
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default := #bottom.
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((style == #mswindows) or:[style == #motif]) ifTrue:[
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default := #around.
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style == #motif ifTrue:[
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self level:-1
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]
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].
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layout := resources at:'SCROLLBAR_LAYOUT' default:default.
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! !
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!ScrollBar methodsFor:'accessing'!
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scrollAction:aBlock
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"set the action, aBlock to be performed when the scroller is moved"
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thumb scrollAction:aBlock
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!
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scrollUpAction:aBlock
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"set the action, aBlock to be performed when the up-button is pressed"
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button1 action:aBlock
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!
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scrollDownAction:aBlock
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"set the action, aBlock to be performed when the down-button is pressed"
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button2 action:aBlock
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!
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thumbColor:aColor
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thumb thumbColor:aColor
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!
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thumbOrigin
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"answer position of (top of) thumb in percent"
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^ thumb thumbOrigin
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!
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thumbOrigin:newOrigin
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"set position of (top of) thumb in percent"
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^ thumb thumbOrigin:newOrigin
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!
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thumbHeight
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"answer height of thumb in percent"
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^ thumb thumbHeight
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!
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thumbHeight:newHeight
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"set height of thumb in percent"
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^ thumb thumbHeight:newHeight
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!
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thumbOrigin:newOrigin thumbHeight:newHeight
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"set origin and height of thumb in percent"
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^ thumb thumbOrigin:newOrigin thumbHeight:newHeight
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!
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setThumbFor:aView
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"adjust thumb for aView"
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thumb setThumbFor:aView
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!
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setThumbHeightFor:aView
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"adjust thumbs height for aView"
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thumb setThumbHeightFor:aView
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!
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setThumbOriginFor:aView
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"adjust thumbs origin for aView"
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thumb setThumbOriginFor:aView
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!
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282 |
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asynchronousOperation
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"set asynchronous-mode - scroll action is performed after movement
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of scroller (i.e. when mouse-button is finally released)"
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thumb asynchronousOperation
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!
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synchronousOperation
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"set synchronous-mode - scroll action is performed for every movement
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of scroller"
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293 |
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thumb synchronousOperation
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! !
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!ScrollBar methodsFor:'events'!
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sizeChanged:how
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"when my size changes, I have to resize/reposition the subviews"
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|upHeight downHeight thumbHeight upAndDownHeight bwn sep sep2
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3
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thumbWidth w|
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0
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304 |
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button1 isNil ifTrue:[^ self].
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thumb isNil ifTrue:[^ self].
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button2 isNil ifTrue:[^ self].
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308 |
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upHeight := button1 height + borderWidth.
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310 |
downHeight := button2 height + borderWidth.
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311 |
upAndDownHeight := upHeight + downHeight.
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3
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312 |
bwn := borderWidth negated + margin.
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0
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313 |
self is3D ifTrue:[
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sep := 1
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] ifFalse:[
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sep := 0
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317 |
].
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318 |
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319 |
thumbHeight := height - upAndDownHeight - borderWidth - (sep * 3).
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3
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320 |
"
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0
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321 |
((layout ~~ #top) and:[layout ~~ #bottom]) ifTrue:[
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322 |
thumbHeight := thumbHeight - borderWidth
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323 |
].
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3
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324 |
"
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325 |
layout == #around ifTrue:[
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326 |
thumbHeight := thumbHeight + borderWidth
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327 |
].
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0
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328 |
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329 |
"if I become too small, hide buttons and thumb"
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330 |
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331 |
height < (upHeight + downHeight) ifTrue:[
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332 |
button1 shown ifTrue:[
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333 |
button1 hidden.
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334 |
button2 hidden.
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335 |
thumb hidden
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336 |
]
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337 |
] ifFalse:[
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338 |
shown ifTrue:[
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339 |
button1 shown ifFalse:[
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340 |
button1 show.
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341 |
button2 show.
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342 |
thumb show
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343 |
]
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344 |
]
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345 |
].
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346 |
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347 |
(thumbHeight < 10) ifTrue:[
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348 |
thumb shown ifTrue:[
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349 |
thumb hidden
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350 |
]
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351 |
] ifFalse:[
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352 |
thumb shown ifFalse:[
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353 |
button1 shown ifTrue:[
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354 |
thumb show
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355 |
]
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356 |
]
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357 |
].
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358 |
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|
359 |
"width of buttons is always my width"
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360 |
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3
|
361 |
w := width - (margin * 2).
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362 |
(w ~~ button1 width) ifTrue:[
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|
363 |
button1 width:w.
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|
364 |
button2 width:w
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0
|
365 |
].
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366 |
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3
|
367 |
thumbWidth := w.
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0
|
368 |
style == #next ifTrue:[
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369 |
thumbWidth := thumbWidth - (thumb borderWidth * 2).
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|
370 |
thumbHeight := thumbHeight - 1
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371 |
].
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372 |
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373 |
(layout == #top) ifTrue:[
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|
374 |
"buttons at top"
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|
375 |
thumb extent:(thumbWidth @ thumbHeight).
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376 |
^ self
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377 |
].
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378 |
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379 |
sep2 := sep * 2.
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380 |
(layout == #bottom) ifTrue:[
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381 |
"buttons at bottom"
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|
382 |
thumbHeight := thumbHeight + borderWidth.
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|
383 |
(how == #smaller) ifTrue:[
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|
384 |
thumb extent:(thumbWidth @ thumbHeight).
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|
385 |
button1 origin:(bwn @ (thumbHeight + sep2)).
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|
386 |
button2 origin:(bwn @ (thumbHeight + sep2 + upHeight))
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387 |
] ifFalse:[
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|
388 |
button1 origin:(bwn @ (thumbHeight + sep2)).
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|
389 |
button2 origin:(bwn @ (thumbHeight + sep2 + upHeight)).
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|
390 |
thumb extent:(thumbWidth @ thumbHeight)
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391 |
].
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|
392 |
^ self
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393 |
].
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394 |
"buttons around thumb"
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395 |
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|
3
|
396 |
button1 origin:(bwn @ bwn).
|
|
|
397 |
button2 origin:(bwn @ (upHeight + thumbHeight + sep2 "+ borderWidth")).
|
|
|
398 |
thumb extent:(thumbWidth @ (thumbHeight + margin)).
|
|
0
|
399 |
thumb origin:(bwn @ (upHeight - borderWidth + sep))
|
|
|
400 |
! !
|