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"
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COPYRIGHT (c) 1993 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:#ImageView
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instanceVariableNames:'image'
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classVariableNames:''
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poolDictionaries:''
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category:'Views-Misc'
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!
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ImageView comment:'
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COPYRIGHT (c) 1993 by Claus Gittinger
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All Rights Reserved
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$Header: /cvs/stx/stx/libwidg2/ImageView.st,v 1.5 1994-10-10 03:13:21 claus Exp $
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'!
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!ImageView class methodsFor:'startup'!
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openOn:aFileName
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"startup an image viewer"
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|top v imageView img icnW icnH icn magX magY mag wg|
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top := StandardSystemView label:aFileName.
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top iconLabel:aFileName asFilename baseName.
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v := HVScrollableView for:self in:top.
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v origin:0@0 extent:1.0@1.0.
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imageView := v scrolledView.
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img := Image fromFile:aFileName.
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img notNil ifTrue:[
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imageView image:img.
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"define an icon view showing little version of image.
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Since some window managers cannot handle this correctly (twm),
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this is only done when running on an IRIS"
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7
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(true "(OperatingSystem getSystemType = 'iris')" and:[self defaultStyle == #iris]) ifTrue:[
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icn := self new.
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"for now; should somehow get access to preferred iconview extent ..."
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icnW := 86.
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icnH := 68.
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((img width <= icnW) and:[img height <= icnH]) ifTrue:[
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icn extent:(img width @ img height).
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mag := 1 @ 1
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] ifFalse:[
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magX := icnW / img width.
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magY := icnH / img height.
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"scale image"
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"
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mag := magX @ magY.
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"
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"preserve ratio"
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"
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mag := (magX min:magY) asPoint.
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"
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" "
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mag := (magX max:magY) asPoint.
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" "
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icn extent:((img width @ img height) * mag) rounded.
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].
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"start icon as a low prio bg process -
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so magnification and color allocation will not hurt us ..."
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ProcessorScheduler isPureEventDriven ifFalse:[
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wg := WindowGroup new.
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icn windowGroup:wg.
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wg addTopView:icn.
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wg startup.
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wg process priority:4.
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].
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top iconView:icn.
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].
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].
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top open.
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icn notNil ifTrue:[
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[
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icn image:(img magnifyBy:mag).
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] forkAt:4
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].
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"ImageView openOn:'bitmaps/garfield.gif'"
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! !
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!ImageView class methodsFor:'documentation'!
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documentation
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"
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This View knows how to display an image (or form).
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You can display an image with:
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(ImageView new image:anImage) realize
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i.e.
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(ImageView new image:(Image fromFile:''bitmaps/garfield.gif'')) realize
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(ImageView new image:(Image fromFile:''bitmaps/dano.tiff'')) realize
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(ImageView new image:(Form fromFile:''SBrowser.xbm'')) realize
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or simply by:
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ImageView startOn:''bitmaps/garfield.gif''
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"
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! !
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!ImageView methodsFor:'release'!
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destroy
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image := nil.
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super destroy.
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! !
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!ImageView methodsFor:'drawing'!
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redraw
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|clrMap|
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image notNil ifTrue:[
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image := image on:device.
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self clear.
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(image depth == 1) ifTrue:[
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clrMap := image colorMap.
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clrMap notNil ifTrue:[
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self paint:(clrMap at:2) on:(clrMap at:1).
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] ifFalse:[
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self paint:Color black on:Color white.
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]
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].
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self displayOpaqueForm:image x:(0 - viewOrigin x) y:(0 - viewOrigin y)
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]
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! !
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!ImageView methodsFor:'accessing'!
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image:anImage
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"set the image - show a wait cursor, since image dithering may take a while"
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image := anImage.
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anImage notNil ifTrue:[
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self cursor:Cursor wait.
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shown ifTrue:[
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self redraw
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].
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self contentsChanged.
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self cursor:(Cursor normal).
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].
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"
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ImageView new realize image:(Image fromFile:'bitmaps/claus.gif')
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|f|
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f := Image fromFile:'bitmaps/SBrowser.xbm'.
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f colorMap:(Array with:Color red with:Color yellow).
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ImageView new realize image:f
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"
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!
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image
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"return the image"
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^ image
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! !
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!ImageView methodsFor:'queries'!
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widthOfContents
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"return the images width - scrollbar needs this info"
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image isNil ifTrue:[^ 0].
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^ image width
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!
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heightOfContents
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"return the images height - scrollbar needs this info"
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image isNil ifTrue:[^ 0].
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^ image height
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! !
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