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"
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COPYRIGHT (c) 1989 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:''
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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 by Claus Gittinger
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All Rights Reserved
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$Header: /cvs/stx/stx/libwidg/HorizontalScrollBar.st,v 1.12 1995-05-12 18:24:16 claus Exp $
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'!
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!HorizontalScrollBar class methodsFor:'documentation'!
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copyright
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"
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COPYRIGHT (c) 1989 by Claus Gittinger
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59
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All Rights Reserved
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0
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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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!
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version
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"
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$Header: /cvs/stx/stx/libwidg/HorizontalScrollBar.st,v 1.12 1995-05-12 18:24:16 claus Exp $
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"
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!
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documentation
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"
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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 performs a
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predefined action.
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"
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! !
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!HorizontalScrollBar methodsFor:'initialization'!
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createElements
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"private: create my elements"
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button1 := ArrowButton leftIn:self.
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button2 := ArrowButton rightIn:self.
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thumb := HorizontalScroller in:self.
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!
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computeInitialExtent
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"compute my extent from sub-components"
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|w h leftForm rightForm wLeft hLeft wRight hRight style|
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"need fix - this is a kludge;
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the if should not be needed ..."
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style := StyleSheet name.
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style == #mswindows ifTrue:[
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h := button1 height max:button2 height.
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w := button1 width + button2 width + (Scroller defaultExtent x).
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] ifFalse:[
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leftForm := ArrowButton leftArrowButtonForm:style on:device.
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rightForm := ArrowButton rightArrowButtonForm:style on:device.
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"
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just in case ...
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"
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leftForm isNil ifTrue:[
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wLeft := hLeft := 16
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] ifFalse:[
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wLeft := leftForm width.
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hLeft := leftForm height
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].
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rightForm isNil ifTrue:[
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wRight := hRight := 16
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] ifFalse:[
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wRight := rightForm width.
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hRight := rightForm height
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].
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w := wLeft + wRight + (1 * 2) + (HorizontalScroller defaultExtent x).
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h := hLeft max:hRight.
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(style ~~ #normal) ifTrue:[
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h := h + 4.
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w := w + 4
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].
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].
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self extent:w @ h.
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!
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setElementPositions
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"position sub-components"
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|bwn|
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bwn := borderWidth negated + margin.
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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
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+ borderWidth
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+ button2 width
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+ elementSpacing + elementSpacing) @ bwn).
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thumb viewGravity:#West.
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^ self
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].
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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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].
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"layout == #around "
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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 + elementSpacing) @ bwn).
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thumb viewGravity:#West
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! !
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!HorizontalScrollBar methodsFor:'accessing-behavior'!
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scrollLeftAction
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"return the action which is performed on scroll-left"
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^ button1 action
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scrollLeftAction:aBlock
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"set the action to be performed on scroll-left"
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button1 action:aBlock
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!
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scrollRightAction
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"return the action which is performed on scroll-right"
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^ button2 action
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!
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scrollRightAction:aBlock
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"set the action to be performed on scroll-right"
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button2 action:aBlock
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! !
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!HorizontalScrollBar methodsFor:'event handling'!
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sizeChanged:how
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"handle changed size - reposition elements"
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|leftWidth rightWidth thumbWidth leftAndRightWidth bwn sep2
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thumbHeight h style|
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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 + margin.
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thumbWidth := width - leftAndRightWidth - borderWidth - (elementSpacing * 3).
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"
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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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"
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layout == #around 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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h := height - (margin * 2).
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(h ~~ button1 height) ifTrue:[
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button1 height:h.
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button2 height:h
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].
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thumbHeight := h.
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style := StyleSheet name.
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style == #next ifTrue:[
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thumbHeight := thumbHeight - (thumb borderWidth * 2).
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thumbWidth := thumbWidth - 1
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].
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style == #motif ifTrue:[
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thumbWidth := thumbWidth - margin
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].
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"
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a kludge: views with width or height of 0 are illegal
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avoid error from view-creation (it will be hidden anyway)
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"
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thumbWidth <= 0 ifTrue:[
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thumbWidth := 1
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].
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(layout == #bottom) ifTrue:[
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"buttons at left"
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thumb extent:(thumbWidth @ thumbHeight).
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^ self
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].
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sep2 := elementSpacing * 2.
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(layout == #top) ifTrue:[
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"buttons at right"
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thumbWidth := thumbWidth + borderWidth.
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(how == #smaller) ifTrue:[
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thumb extent:(thumbWidth @ thumbHeight).
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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 @ thumbHeight)
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].
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^ self
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].
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"button around thumb"
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style == #motif ifTrue:[
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sep2 := sep2 + 1
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].
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button1 origin:(bwn @ bwn).
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button2 origin:((leftWidth + thumbWidth + sep2 - (margin // 2)) @ bwn).
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thumb extent:((thumbWidth + margin - (margin // 2)) @ thumbHeight).
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thumb origin:((leftWidth - borderWidth + elementSpacing) @ bwn)
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! !
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