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"
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5
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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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SimpleView subclass:#ScrollBar
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instanceVariableNames:'thumb button1 button2 buttonLayout elementSpacing'
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classVariableNames:'DefaultButtonPositions DefaultLevel DefaultElementSpacing
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DefaultScrollerBordered'
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poolDictionaries:''
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category:'Views-Interactors'
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!
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!ScrollBar 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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38
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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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documentation
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"
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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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The action is specified by: the block to be evaluated for step-up
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aScrollBar scrollUpAction:aBlock
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(scrollLeftAction for hor-Scrollbars)
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aScrollBar scrollDownAction:aBlock the block to be evaluated for step-down
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(scrollRightAction for hor-Scrollbars)
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aScrollbar scrollAction:aBlock the block to be evaluated for scroll
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passing percentage as argument.
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Scrollbars can scroll syncronous (i.e. every movement is notified immediately via the
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scrollAction) or asynchronous (i.e. only one notification takes place at the end of the movement).
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The choice is up to the user of the scrollbar (typically, views which are complicated to redraw,
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will set it to asynchronous.)
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Most often scrollbars are used hidden with ScrollableView or HVScrollableView (i.e. you
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dont have to care for all the details).
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The scrollBars and scrollers protocols have been made similar enough to
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allow transparent use of either a scroller or a scrollBar in applications.
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"
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! !
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!ScrollBar class methodsFor:'style changes'!
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updateStyleCache
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DefaultButtonPositions := StyleSheet at:'scrollBarButtonPositions' default:#bottom.
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DefaultLevel := StyleSheet at:'scrollBarLevel'.
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DefaultScrollerBordered := StyleSheet at:'scrollBarScrollerBordered' default:false.
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DefaultElementSpacing := StyleSheet at:'scrollBarElementSpacing'
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default:(StyleSheet is3D ifTrue:[1] ifFalse:[0]).
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! !
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!ScrollBar methodsFor:'accessing'!
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downButton
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"return the down-button
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(Please: only use direct access for special applications)"
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^ button2
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"
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|v|
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v := ScrollableView for:EditTextView.
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v scrolledView contents:('/etc/passwd' asFilename contentsOfEntireFile).
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v scrollBar upButton activeForegroundColor:Color red.
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v scrollBar downButton activeForegroundColor:Color red.
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v open
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"
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!
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setThumbFor:aView
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"adjust thumb for aView
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(i.e. adjust thumbs origin & size for views size & views contents).
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This is forwarded to the scroller here."
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thumb setThumbFor:aView.
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self enableDisableButtons
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!
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setThumbHeightFor:aView
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"adjust thumbs height for aViews size & contents.
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This is forwarded to the scroller here."
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thumb setThumbHeightFor:aView.
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self enableDisableButtons
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!
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setThumbOriginFor:aView
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"adjust thumbs origin for aViews size & contents.
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This is forwarded to the scroller here."
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thumb setThumbOriginFor:aView.
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self enableDisableButtons
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!
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thumbColor:aColor
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"set the thumbs color"
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thumb thumbColor:aColor
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!
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thumbHeight
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"return 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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self enableDisableButtons
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!
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thumbOrigin
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"return 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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self enableDisableButtons
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!
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thumbOrigin:newOrigin thumbHeight:newHeight
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"set origin and height of thumb (both in percent)"
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thumb thumbOrigin:newOrigin thumbHeight:newHeight.
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self enableDisableButtons
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!
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133
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upButton
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"return the up-button
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(Please: only use direct access for special applications)"
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^ button1
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"
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|v|
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v := ScrollableView for:EditTextView.
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v scrolledView contents:('/etc/passwd' asFilename contentsOfEntireFile).
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v scrollBar upButton foregroundColor:(Color red).
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v scrollBar upButton enteredForegroundColor:(Color red lightened).
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v scrollBar downButton foregroundColor:(Color green).
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v scrollBar downButton enteredForegroundColor:(Color green lightened).
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v open
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"
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!
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upButtonLabel:label1 downButtonLabel:label2
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"set the labels shown in the buttons"
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button1 label:label1.
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button2 label:label2.
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self setElementPositions.
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"
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|v|
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v := ScrollableView for:EditTextView.
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v scrolledView contents:('/etc/passwd' asFilename contentsOfEntireFile).
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v scrollBar upButtonLabel:'+' downButtonLabel:'-'.
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v open
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"
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! !
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!ScrollBar methodsFor:'accessing-behavior'!
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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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128
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This is forwarded to the scroller here."
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thumb asynchronousOperation
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!
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205
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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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128
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This is forwarded to the scroller here."
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thumb scrollAction: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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scrollUpAction:aBlock
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"set the action, aBlock to be performed when the up-button is pressed."
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7
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button1 action:aBlock
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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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This is forwarded to the scroller here."
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thumb synchronousOperation
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! !
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!ScrollBar methodsFor:'change & update'!
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update:something with:aParameter from:changedObject
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changedObject == thumb ifTrue:[
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self enableDisableButtons
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]
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0
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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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Also, if I became too small, hide thumb/buttons."
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|upHeight downHeight thumbHeight upAndDownHeight bwn sep2
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thumbWidth w style b1Hidden b2Hidden thumbHidden bY|
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0
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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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style := styleSheet name.
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upHeight := button1 height + borderWidth.
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downHeight := button2 height + borderWidth.
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upAndDownHeight := upHeight + downHeight.
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3
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bwn := borderWidth negated + margin.
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0
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thumbHeight := height - upAndDownHeight - borderWidth - (elementSpacing * 3).
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3
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"
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130
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((buttonLayout ~~ #top) and:[buttonLayout ~~ #bottom]) ifTrue:[
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thumbHeight := thumbHeight - borderWidth
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].
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3
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"
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buttonLayout == #around ifTrue:[
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thumbHeight := thumbHeight + borderWidth
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3
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].
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0
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"if I become too small, hide buttons and thumb"
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height < upAndDownHeight ifTrue:[
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b1Hidden := b2Hidden := thumbHidden := true.
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] ifFalse:[
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b1Hidden := b2Hidden := thumbHidden := false.
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].
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(thumbHeight < 10) ifTrue:[
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thumbHidden := true.
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] ifFalse:[
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thumbHidden := false.
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].
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button1 hiddenOnRealize:b1Hidden.
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b1Hidden ifTrue:[
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button1 unrealize
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] ifFalse:[
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|
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shown ifTrue:[button1 realize]
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].
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button2 hiddenOnRealize:b1Hidden.
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b2Hidden ifTrue:[
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button2 unrealize
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] ifFalse:[
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shown ifTrue:[button2 realize]
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].
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thumb hiddenOnRealize:thumbHidden.
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thumbHidden ifTrue:[
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298 |
thumb unrealize
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] ifFalse:[
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300 |
shown ifTrue:[thumb realize]
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0
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].
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302 |
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303 |
"width of buttons is always my width"
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304 |
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3
|
305 |
w := width - (margin * 2).
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|
306 |
(w ~~ button1 width) ifTrue:[
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|
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button1 width:w.
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|
308 |
button2 width:w
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0
|
309 |
].
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|
310 |
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3
|
311 |
thumbWidth := w.
|
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128
|
312 |
style == #next ifTrue:[
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59
|
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thumbWidth := thumbWidth - (thumb borderWidth * 2).
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|
314 |
thumbHeight := thumbHeight - 1
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0
|
315 |
].
|
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128
|
316 |
style == #motif ifTrue:[
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63
|
317 |
thumbHeight := thumbHeight - margin
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|
318 |
].
|
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0
|
319 |
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38
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320 |
"
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321 |
a kludge: views with width or height of 0 are illegal
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|
322 |
avoid error from view-creation (it will be hidden anyway)
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323 |
"
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324 |
thumbHeight <= 0 ifTrue:[
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59
|
325 |
thumbHeight := 1
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38
|
326 |
].
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|
327 |
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130
|
328 |
(buttonLayout == #top) ifTrue:[
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59
|
329 |
"buttons at top"
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|
330 |
thumb extent:(thumbWidth @ thumbHeight).
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|
331 |
^ self
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0
|
332 |
].
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|
333 |
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59
|
334 |
sep2 := elementSpacing * 2.
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130
|
335 |
(buttonLayout == #bottom) ifTrue:[
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336 |
"buttons at bottom"
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143
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337 |
"/
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|
338 |
"/ XX: I thought, that viewGravity shuld fix things automatically
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|
339 |
"/ XX: it seems not to do it (or I misused it ;-)
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|
340 |
"/ XX: anyway, viewGravity is an X special feature which is probably
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341 |
"/ XX: not available with other windowing systems. Therefore,
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|
342 |
"/ XX: the viewGravity depending code below is disabled.
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|
343 |
"/ XX: resize is somewhat slower, though.
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|
344 |
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59
|
345 |
thumbHeight := thumbHeight + borderWidth.
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143
|
346 |
"/ XX thumbHidden ifTrue:[
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|
347 |
"/ XX bY := elementSpacing
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|
348 |
"/ XX ] ifFalse:[
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130
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349 |
bY := thumbHeight + sep2.
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143
|
350 |
"/ XX ].
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|
351 |
"XX" button1 viewGravity:#North.
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|
352 |
"XX" button2 viewGravity:#North.
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59
|
353 |
(how == #smaller) ifTrue:[
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|
354 |
thumb extent:(thumbWidth @ thumbHeight).
|
|
143
|
355 |
"XX" button1 origin:(bwn @ (thumbHeight + sep2)).
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|
356 |
"XX" button2 origin:(bwn @ (thumbHeight + sep2 + upHeight))
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59
|
357 |
] ifFalse:[
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130
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358 |
button1 origin:(bwn @ bY).
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|
359 |
button2 origin:(bwn @ (bY + upHeight)).
|
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59
|
360 |
thumb extent:(thumbWidth @ thumbHeight)
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|
361 |
].
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362 |
^ self
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0
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363 |
].
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|
364 |
"buttons around thumb"
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|
365 |
|
|
128
|
366 |
style == #motif ifTrue:[
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|
367 |
sep2 := sep2 + 1
|
|
|
368 |
].
|
|
3
|
369 |
button1 origin:(bwn @ bwn).
|
|
128
|
370 |
|
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|
371 |
style == #os2 ifTrue:[
|
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|
372 |
button2 origin:(bwn @ (upHeight + thumbHeight + sep2 - margin "+ borderWidth")).
|
|
|
373 |
thumb extent:(thumbWidth @ (thumbHeight - margin - margin "+ margin - (margin // 2)")).
|
|
|
374 |
thumb origin:(bwn @ (upHeight - borderWidth + elementSpacing + margin))
|
|
|
375 |
] ifFalse:[
|
|
|
376 |
button2 origin:(bwn @ (upHeight + thumbHeight + sep2 - (margin // 2) "+ borderWidth")).
|
|
|
377 |
thumb extent:(thumbWidth @ (thumbHeight + margin - (margin // 2))).
|
|
|
378 |
thumb origin:(bwn @ (upHeight - borderWidth + elementSpacing))
|
|
|
379 |
].
|
|
0
|
380 |
! !
|
|
110
|
381 |
|
|
|
382 |
!ScrollBar methodsFor:'forced scroll'!
|
|
|
383 |
|
|
205
|
384 |
pageDown
|
|
|
385 |
"page down/right"
|
|
|
386 |
|
|
|
387 |
thumb pageDown
|
|
|
388 |
!
|
|
|
389 |
|
|
110
|
390 |
pageUp
|
|
|
391 |
"page up/left"
|
|
|
392 |
|
|
|
393 |
thumb pageUp
|
|
205
|
394 |
! !
|
|
|
395 |
|
|
|
396 |
!ScrollBar methodsFor:'initialization'!
|
|
|
397 |
|
|
|
398 |
computeInitialExtent
|
|
|
399 |
"compute my extent from sub-components"
|
|
|
400 |
|
|
|
401 |
self extent:(self preferredExtent).
|
|
|
402 |
!
|
|
|
403 |
|
|
|
404 |
createElements
|
|
|
405 |
button1 := ArrowButton upIn:self.
|
|
|
406 |
button2 := ArrowButton downIn:self.
|
|
|
407 |
thumb := Scroller in:self.
|
|
|
408 |
!
|
|
|
409 |
|
|
|
410 |
initStyle
|
|
|
411 |
super initStyle.
|
|
|
412 |
|
|
|
413 |
buttonLayout := DefaultButtonPositions.
|
|
|
414 |
DefaultLevel notNil ifTrue:[
|
|
|
415 |
self level:DefaultLevel
|
|
|
416 |
].
|
|
|
417 |
elementSpacing := DefaultElementSpacing
|
|
|
418 |
!
|
|
|
419 |
|
|
|
420 |
initialize
|
|
|
421 |
"setup; create the 2 buttons and a scroller"
|
|
|
422 |
|
|
|
423 |
|clr style|
|
|
|
424 |
|
|
|
425 |
super initialize.
|
|
|
426 |
|
|
|
427 |
self createElements.
|
|
|
428 |
|
|
|
429 |
(styleSheet at:'scrollBarDisableButtons' default:false) ifTrue:[
|
|
|
430 |
thumb addDependent:self
|
|
|
431 |
].
|
|
|
432 |
|
|
|
433 |
button1 autoRepeat.
|
|
|
434 |
button2 autoRepeat.
|
|
|
435 |
|
|
|
436 |
self computeInitialExtent.
|
|
|
437 |
|
|
|
438 |
button1 borderWidth:borderWidth.
|
|
|
439 |
DefaultScrollerBordered ifFalse:[
|
|
|
440 |
thumb borderWidth:borderWidth.
|
|
|
441 |
].
|
|
|
442 |
button2 borderWidth:borderWidth.
|
|
|
443 |
|
|
|
444 |
style := styleSheet name.
|
|
|
445 |
((style = #iris) and:[Display hasGreyscales]) ifTrue:[
|
|
|
446 |
"have to change some of Buttons defaults"
|
|
|
447 |
clr := (Color grey:25) on:device.
|
|
|
448 |
button1 offLevel:2.
|
|
|
449 |
button2 offLevel:2.
|
|
|
450 |
button1 foregroundColor:clr.
|
|
|
451 |
button1 activeForegroundColor:clr.
|
|
|
452 |
button1 enteredForegroundColor:clr.
|
|
|
453 |
button2 foregroundColor:clr.
|
|
|
454 |
button2 activeForegroundColor:clr.
|
|
|
455 |
button2 enteredForegroundColor:clr.
|
|
|
456 |
].
|
|
|
457 |
|
|
|
458 |
self setElementPositions.
|
|
|
459 |
|
|
|
460 |
style = #motif ifTrue:[
|
|
|
461 |
clr := thumb thumbColor.
|
|
|
462 |
button1 foregroundColor:clr.
|
|
|
463 |
button2 foregroundColor:clr.
|
|
|
464 |
|
|
|
465 |
clr := thumb viewBackground.
|
|
|
466 |
button1 viewBackground:clr.
|
|
|
467 |
button2 viewBackground:clr.
|
|
|
468 |
button1 backgroundColor:clr.
|
|
|
469 |
button2 backgroundColor:clr.
|
|
|
470 |
button1 activeBackgroundColor:clr.
|
|
|
471 |
button2 activeBackgroundColor:clr.
|
|
|
472 |
device hasGreyscales ifFalse:[
|
|
|
473 |
button1 activeForegroundColor:Black.
|
|
|
474 |
button2 activeForegroundColor:Black.
|
|
|
475 |
]
|
|
|
476 |
]
|
|
|
477 |
!
|
|
|
478 |
|
|
|
479 |
reinitialize
|
|
|
480 |
super reinitialize.
|
|
|
481 |
self setElementPositions.
|
|
110
|
482 |
!
|
|
|
483 |
|
|
205
|
484 |
setElementPositions
|
|
|
485 |
"position sub-components"
|
|
|
486 |
|
|
|
487 |
|bwn|
|
|
|
488 |
|
|
|
489 |
bwn := borderWidth negated + margin.
|
|
|
490 |
|
|
|
491 |
(buttonLayout == #top) ifTrue:[
|
|
|
492 |
button1 origin:(bwn @ bwn).
|
|
|
493 |
button1 viewGravity:#North.
|
|
|
494 |
button2 origin:(bwn @ (button1 height)).
|
|
|
495 |
button2 viewGravity:#North.
|
|
|
496 |
thumb origin:(bwn @ (button1 height
|
|
|
497 |
+ borderWidth
|
|
|
498 |
+ button2 height
|
|
|
499 |
+ elementSpacing
|
|
|
500 |
+ elementSpacing)).
|
|
|
501 |
thumb viewGravity:#North.
|
|
|
502 |
^ self
|
|
|
503 |
].
|
|
|
504 |
(buttonLayout == #bottom) ifTrue:[
|
|
|
505 |
device supportsViewGravity ifTrue:[
|
|
|
506 |
button1 viewGravity:#South.
|
|
|
507 |
button2 viewGravity:#South.
|
|
|
508 |
thumb viewGravity:#North.
|
|
|
509 |
].
|
|
|
510 |
thumb origin:(bwn @ bwn).
|
|
|
511 |
^ self
|
|
|
512 |
].
|
|
|
513 |
|
|
|
514 |
"buttonLayout == #around"
|
|
|
515 |
button1 origin:(bwn @ bwn).
|
|
|
516 |
button1 viewGravity:#North.
|
|
|
517 |
"/ button2 viewGravity:#North.
|
|
|
518 |
thumb origin:(bwn @ (button1 height + elementSpacing)).
|
|
|
519 |
thumb viewGravity:#North
|
|
|
520 |
! !
|
|
|
521 |
|
|
|
522 |
!ScrollBar methodsFor:'private'!
|
|
|
523 |
|
|
|
524 |
enableDisableButtons
|
|
|
525 |
"only used with styles which disable their buttons if the
|
|
|
526 |
thumb is at either end. Check where the thumb is and enable/disable
|
|
|
527 |
as appropriate."
|
|
|
528 |
|
|
|
529 |
|e1 e2 th to|
|
|
|
530 |
|
|
|
531 |
(styleSheet at:'scrollBarDisableButtons' default:false) ifFalse:[^ self].
|
|
110
|
532 |
|
|
205
|
533 |
e1 := e2 := true.
|
|
|
534 |
(th := thumb thumbHeight) notNil ifTrue:[
|
|
|
535 |
(th >= (thumb stop)) ifTrue:[
|
|
|
536 |
e1 := false.
|
|
|
537 |
e2 := false
|
|
|
538 |
]
|
|
|
539 |
].
|
|
|
540 |
((to := thumb thumbOrigin) <= thumb start) ifTrue:[
|
|
|
541 |
e1 := false
|
|
|
542 |
] ifFalse:[
|
|
|
543 |
th isNil ifTrue:[th := 0].
|
|
|
544 |
(to + th) >= thumb stop ifTrue:[
|
|
|
545 |
e2 := false
|
|
|
546 |
]
|
|
|
547 |
].
|
|
|
548 |
e1 ifTrue:[button1 enable] ifFalse:[button1 disable].
|
|
|
549 |
e2 ifTrue:[button2 enable] ifFalse:[button2 disable].
|
|
110
|
550 |
! !
|
|
205
|
551 |
|
|
|
552 |
!ScrollBar methodsFor:'queries'!
|
|
|
553 |
|
|
|
554 |
preferredExtent
|
|
|
555 |
"compute my extent from sub-components"
|
|
|
556 |
|
|
|
557 |
|w h upForm downForm
|
|
|
558 |
upHeight "{ Class: SmallInteger }"
|
|
|
559 |
downHeight "{ Class: SmallInteger }"
|
|
|
560 |
upWidth downWidth style|
|
|
|
561 |
|
|
|
562 |
"
|
|
|
563 |
need fix - this is a kludge;
|
|
|
564 |
the if should not be needed ...
|
|
|
565 |
"
|
|
|
566 |
style := styleSheet name.
|
|
|
567 |
style == #mswindows ifTrue:[
|
|
|
568 |
w := button1 width max:button2 width.
|
|
|
569 |
h := button1 height + button2 height + (Scroller defaultExtent y).
|
|
|
570 |
] ifFalse:[
|
|
|
571 |
upForm := ArrowButton upArrowButtonForm:style on:device.
|
|
|
572 |
downForm := ArrowButton downArrowButtonForm:style on:device.
|
|
|
573 |
upForm isNil ifTrue:[
|
|
|
574 |
upHeight := upWidth := 16.
|
|
|
575 |
] ifFalse:[
|
|
|
576 |
upHeight := upForm height.
|
|
|
577 |
upWidth := upForm width
|
|
|
578 |
].
|
|
|
579 |
downForm isNil ifTrue:[
|
|
|
580 |
downHeight := downWidth := 16
|
|
|
581 |
] ifFalse:[
|
|
|
582 |
downHeight := downForm height.
|
|
|
583 |
downWidth := downForm width
|
|
|
584 |
].
|
|
|
585 |
h := upHeight + downHeight + (1 * 2) + (Scroller defaultExtent y).
|
|
|
586 |
w := upWidth max:downWidth.
|
|
|
587 |
style ~~ #normal ifTrue:[
|
|
|
588 |
h := h + 4.
|
|
|
589 |
w := w + 4
|
|
|
590 |
].
|
|
|
591 |
].
|
|
|
592 |
|
|
|
593 |
^ w @ h.
|
|
|
594 |
! !
|
|
|
595 |
|
|
|
596 |
!ScrollBar class methodsFor:'documentation'!
|
|
|
597 |
|
|
|
598 |
version
|
|
|
599 |
^ '$Header: /cvs/stx/stx/libwidg/ScrollBar.st,v 1.20 1995-11-23 18:18:24 cg Exp $'
|
|
|
600 |
! !
|