author | Claus Gittinger <cg@exept.de> |
Sun, 29 Jul 2018 10:16:12 +0200 | |
changeset 5842 | b27b6272d344 |
parent 5059 | a74fc831621c |
permissions | -rw-r--r-- |
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"{ Encoding: utf8 }" |
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" |
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COPYRIGHT (c) 1999 by eXept Software AG |
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All Rights Reserved |
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||
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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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"{ Package: 'stx:libwidg2' }" |
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"{ NameSpace: Smalltalk }" |
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AbstractHierarchicalItemWithModel subclass:#CompactHierarchicalItem |
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instanceVariableNames:'widthAndHeight' |
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classVariableNames:'MaskHeight MaskWidth MaskExpanded ShiftHeight ShiftWidth' |
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poolDictionaries:'' |
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category:'Views-Support' |
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! |
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Object subclass:#Geometry |
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instanceVariableNames:'width height isExpanded' |
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classVariableNames:'' |
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poolDictionaries:'' |
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privateIn:CompactHierarchicalItem |
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! |
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!CompactHierarchicalItem class methodsFor:'documentation'! |
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copyright |
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" |
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COPYRIGHT (c) 1999 by eXept Software AG |
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All Rights Reserved |
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||
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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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Compact Hierarchical Items are a new, tuned and optimized version of the original |
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hierarchical item, which suffers various problems: |
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1) the old item did not store the model, which in many situations leads to very |
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poor performance (it walks along the super-item hierarchy to find the model, |
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which makes many algorithms O(n^2) instead of O(n) |
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2) it keeps individual width/height information, where this could be shared if |
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many items have the same extent. |
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3) it uses separate width/height instvars, where this information can be stored more compact |
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in single integer (using bit-masks) |
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4) it uses a separate boolean for the isExpanded, which could be encoded more space efficient as a single bit |
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Problems 2-4 only apply to huge trees with (say 100s of thousands of items). Such big trees are encountered |
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for example in the expecco activity log. |
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This class solves those issues: |
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- it uses a compact width/height representation (bit masks in an integer), for |
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items within a reasonable size (0 to 64k pixels wide, 0 to 16k pixels high). |
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- falls back to a separate width/height holding object, if ever exceeded (which is unlikely) |
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- it encodes the expanded state in a single bit |
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- it uses the saved slot to allow for the model to be kept locally |
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Notice, that in order to be backward compatible, the cached width and height fields can |
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take integer values AND nil. Nil is typically used to mark an invalid cached value. |
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Here, the nil case is encoded in the bitField as all-ones (max value). |
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Before changing the superclass of your existing HierarchicalItem subclass, make sure that the subclass does not access |
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the instvars isExpanded, width and heigh directly. |
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Instead, use the getters isExpanded, width and height and the setters setExpanded:, width: and height: |
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[author:] |
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Claus Gittinger |
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[see also:] |
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HierarchicalItem |
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" |
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! ! |
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!CompactHierarchicalItem class methodsFor:'class initialization'! |
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initialize |
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ShiftWidth := 1. |
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MaskWidth := 16rFFFF. |
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ShiftHeight := 1 + MaskWidth highBit. |
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MaskHeight := 16r1FFF. |
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MaskExpanded := 1. |
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"/ self assert:(ShiftHeight + (MaskHeight highBit)) < 31. |
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! ! |
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!CompactHierarchicalItem class methodsFor:'queries'! |
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isAbstract |
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"Return if this class is an abstract class. |
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True is returned here for myself only; false for subclasses. |
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Abstract subclasses must redefine this again." |
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^ self == CompactHierarchicalItem. |
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! ! |
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!CompactHierarchicalItem methodsFor:'private'! |
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makeWidthAndHeightUnknown |
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"invalidate any cached with/height information" |
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"see comments in widthOn/heightOn" |
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self width:nil height:nil. |
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! |
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setExpanded:aBoolean |
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"set expanded flag without any computation or notification" |
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self width:(self width) height:(self height) isExpanded:aBoolean. |
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! ! |
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!CompactHierarchicalItem methodsFor:'protocol-displaying'! |
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getWidthAndHeightOn:aGC |
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"fetch the width and height from my label, if it is to be displayed on aGC" |
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|lbl| |
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lbl := self label. |
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self |
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width:(self widthOf:lbl on:aGC) |
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height:(self heightOf:lbl on:aGC) |
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! |
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height |
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"return the cached height" |
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|h| |
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widthAndHeight isNil ifTrue:[ |
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^ nil |
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]. |
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widthAndHeight isInteger ifTrue:[ |
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h := (widthAndHeight rightShift:ShiftHeight) bitAnd:MaskHeight. |
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h == MaskHeight ifTrue:[ ^ nil]. |
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^ h |
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]. |
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^ widthAndHeight height ? 0. |
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! |
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height:h |
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"encode the cached height, preserving the isExpanded state" |
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self width:(self width) height:h isExpanded:(self isExpanded). |
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! |
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heightOn:aGC |
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"return the height of the receiver, if it is to be displayed on aGC" |
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|h| |
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widthAndHeight isNil ifTrue:[ |
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self getWidthAndHeightOn:aGC. |
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]. |
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widthAndHeight isInteger ifTrue:[ |
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h := (widthAndHeight rightShift:ShiftHeight) bitAnd:MaskHeight. |
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h == MaskHeight ifTrue:[ |
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self getWidthAndHeightOn:aGC. |
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h := (widthAndHeight rightShift:ShiftHeight) bitAnd:MaskHeight. |
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h == MaskHeight ifTrue:[^ nil]. |
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]. |
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^ h |
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]. |
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^ widthAndHeight height |
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! |
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isExpanded |
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widthAndHeight isNil ifTrue:[ |
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^ false |
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]. |
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widthAndHeight isInteger ifTrue:[ |
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^ widthAndHeight bitTest:MaskExpanded |
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]. |
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^ widthAndHeight isExpanded |
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! |
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width |
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"return the cached width" |
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|w| |
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widthAndHeight isNil ifTrue:[ |
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^ nil |
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]. |
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widthAndHeight isInteger ifTrue:[ |
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w := (widthAndHeight rightShift:ShiftWidth) bitAnd:MaskWidth. |
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w == MaskWidth ifTrue:[^ nil]. |
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^ w |
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]. |
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^ widthAndHeight width. |
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"Modified (comment): / 28-07-2018 / 13:31:02 / Claus Gittinger" |
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! |
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width:w |
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"encode the cached width, preserving the isExpanded state" |
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self width:w height:(self height) isExpanded:(self isExpanded). |
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! |
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width:w height:h |
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"encode width and height, preserving the isExpanded state" |
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self width:w height:h isExpanded:(self isExpanded). |
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! |
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220 |
|
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width:w height:h isExpanded:expanded |
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"encode width and height, and isExpanded state" |
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223 |
|
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224 |
|encodedEx encodedW encodedH| |
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225 |
|
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encodedEx := (expanded ifTrue:[MaskExpanded] ifFalse:[0]). |
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227 |
|
5059 | 228 |
(w isNil) ifTrue:[ |
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encodedW := MaskWidth |
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] ifFalse:[ |
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(w between:0 and:MaskWidth-1) ifTrue:[ |
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232 |
encodedW := w |
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] ifFalse:[ |
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widthAndHeight := Geometry new width:w height:h isExpanded:expanded. |
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^ self. |
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236 |
] |
4736 | 237 |
]. |
5059 | 238 |
(h isNil) ifTrue:[ |
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239 |
encodedH := MaskHeight |
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240 |
] ifFalse:[ |
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(h between:0 and:MaskHeight-1) ifTrue:[ |
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encodedH := h |
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243 |
] ifFalse:[ |
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244 |
widthAndHeight := Geometry new width:w height:h isExpanded:expanded. |
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^ self. |
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246 |
] |
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247 |
]. |
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248 |
|
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widthAndHeight := encodedEx |
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250 |
bitOr:((encodedW bitShift:ShiftWidth) bitOr:(encodedH bitShift:ShiftHeight)) |
4736 | 251 |
! |
252 |
||
253 |
widthOn:aGC |
|
254 |
"return the width of the receiver, if it is to be displayed on aGC" |
|
255 |
||
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256 |
|w| |
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257 |
|
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widthAndHeight isNil ifTrue:[ |
259 |
self getWidthAndHeightOn:aGC. |
|
260 |
]. |
|
261 |
widthAndHeight isInteger ifTrue:[ |
|
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w := (widthAndHeight rightShift:ShiftWidth) bitAnd:MaskWidth. |
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w == MaskWidth ifTrue:[ |
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264 |
self getWidthAndHeightOn:aGC. |
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w := (widthAndHeight rightShift:ShiftWidth) bitAnd:MaskWidth. |
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w == MaskWidth ifTrue:[^ nil]. |
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]. |
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268 |
^ w |
4736 | 269 |
]. |
270 |
^ widthAndHeight width |
|
271 |
! ! |
|
272 |
||
273 |
!CompactHierarchicalItem::Geometry class methodsFor:'documentation'! |
|
274 |
||
275 |
documentation |
|
276 |
" |
|
277 |
instances are only used if any of width/height is too large to fit into the |
|
278 |
compact integer bitmasked representation |
|
279 |
" |
|
280 |
! ! |
|
281 |
||
282 |
!CompactHierarchicalItem::Geometry methodsFor:'accessing'! |
|
283 |
||
284 |
height |
|
285 |
^ height |
|
286 |
! |
|
287 |
||
288 |
height:something |
|
289 |
height := something. |
|
290 |
! |
|
291 |
||
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292 |
isExpanded |
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|
293 |
^ isExpanded ? false |
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|
294 |
! |
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295 |
|
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296 |
isExpanded:aBoolean |
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297 |
isExpanded := aBoolean. |
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|
298 |
! |
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|
299 |
|
4736 | 300 |
width |
301 |
^ width |
|
302 |
! |
|
303 |
||
304 |
width:something |
|
305 |
width := something. |
|
306 |
! |
|
307 |
||
308 |
width:widthArg height:heightArg |
|
309 |
width := widthArg. |
|
310 |
height := heightArg. |
|
4744
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|
311 |
! |
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parents:
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|
312 |
|
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parents:
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|
313 |
width:widthArg height:heightArg isExpanded:expandedArg |
8ec2fbbfce9e
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parents:
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|
314 |
width := widthArg. |
8ec2fbbfce9e
class: CompactHierarchicalItem
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parents:
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changeset
|
315 |
height := heightArg. |
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class: CompactHierarchicalItem
Claus Gittinger <cg@exept.de>
parents:
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changeset
|
316 |
isExpanded := expandedArg. |
4736 | 317 |
! ! |
318 |
||
319 |
!CompactHierarchicalItem class methodsFor:'documentation'! |
|
320 |
||
321 |
version |
|
5059 | 322 |
^ '$Header$' |
4736 | 323 |
! |
324 |
||
325 |
version_CVS |
|
5059 | 326 |
^ '$Header$' |
4736 | 327 |
! ! |
328 |
||
329 |
||
330 |
CompactHierarchicalItem initialize! |