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0
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"
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5
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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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View subclass:#ScrollBar
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instanceVariableNames:'thumb button1 button2 layout elementSpacing'
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classVariableNames:'DefaultButtonPositions DefaultLevel
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DefaultElementSpacing DefaultScrollerBordered'
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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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5
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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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63
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$Header: /cvs/stx/stx/libwidg/ScrollBar.st,v 1.9 1994-11-17 14:38:27 claus Exp $
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0
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26 |
'!
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27 |
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38
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28 |
!ScrollBar class methodsFor:'documentation'!
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0
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38
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copyright
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31 |
"
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32 |
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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34 |
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38
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35 |
This software is furnished under a license and may be used
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36 |
only in accordance with the terms of that license and with the
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37 |
inclusion of the above copyright notice. This software may not
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38 |
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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63
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$Header: /cvs/stx/stx/libwidg/ScrollBar.st,v 1.9 1994-11-17 14:38:27 claus Exp $
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38
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"
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0
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!
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38
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documentation
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"
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52 |
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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56 |
The action is specified by: the block to be evaluated for step-up
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59
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aScrollBar scrollUpAction:aBlock
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(scrollLeftAction for hor-Scrollbars)
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0
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59 |
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59
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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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38
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65 |
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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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"
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0
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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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0
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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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60
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|clr|
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0
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92 |
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super initialize.
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38
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94 |
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self createElements.
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96 |
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21
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button1 autoRepeat.
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button2 autoRepeat.
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99 |
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self computeInitialExtent.
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0
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101 |
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button1 borderWidth:borderWidth.
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DefaultScrollerBordered ifFalse:[
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thumb borderWidth:borderWidth.
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0
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105 |
].
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button2 borderWidth:borderWidth.
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107 |
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59
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108 |
((StyleSheet name = #iris) and:[Display hasGreyscales]) ifTrue:[
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109 |
"have to change some of Buttons defaults"
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clr := (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:clr.
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button1 activeForegroundColor:clr.
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button1 enteredForegroundColor:clr.
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button2 foregroundColor:clr.
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button2 activeForegroundColor:clr.
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button2 enteredForegroundColor:clr.
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0
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].
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120 |
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self setElementPositions.
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StyleSheet name = #motif ifTrue:[
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clr := thumb thumbColor.
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button1 foregroundColor:clr.
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button2 foregroundColor:clr.
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127 |
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clr := thumb viewBackground.
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button1 viewBackground:clr.
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button2 viewBackground:clr.
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button1 backgroundColor:clr.
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button2 backgroundColor:clr.
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button1 activeBackgroundColor:clr.
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134 |
button2 activeBackgroundColor:clr.
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device hasGreyscales ifFalse:[
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button1 activeForegroundColor:Black.
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137 |
button2 activeForegroundColor:Black.
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138 |
]
|
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0
|
139 |
]
|
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3
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140 |
!
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141 |
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142 |
initStyle
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143 |
super initStyle.
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144 |
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layout := DefaultButtonPositions.
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DefaultLevel notNil ifTrue:[
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147 |
self level:DefaultLevel
|
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3
|
148 |
].
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59
|
149 |
elementSpacing := DefaultElementSpacing
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150 |
!
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151 |
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152 |
createElements
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153 |
button1 := ArrowButton upIn:self.
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154 |
button2 := ArrowButton downIn:self.
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155 |
thumb := Scroller in:self.
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156 |
!
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157 |
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setElementPositions
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159 |
"position sub-components"
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160 |
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59
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161 |
|bwn|
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162 |
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163 |
bwn := borderWidth negated + margin.
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164 |
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(layout == #top) ifTrue:[
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button1 origin:(bwn @ bwn).
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167 |
button1 viewGravity:#North.
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button2 origin:(bwn @ (button1 height)).
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169 |
button2 viewGravity:#North.
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thumb origin:(bwn @ (button1 height
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+ borderWidth
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172 |
+ button2 height
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173 |
+ elementSpacing
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+ elementSpacing)).
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175 |
thumb viewGravity:#North.
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176 |
^ self
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38
|
177 |
].
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178 |
(layout == #bottom) ifTrue:[
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63
|
179 |
device supportsViewGravity ifTrue:[
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|
180 |
button1 viewGravity:#South.
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181 |
button2 viewGravity:#South.
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182 |
thumb viewGravity:#North.
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183 |
].
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|
184 |
thumb origin:(bwn @ bwn).
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185 |
^ self
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38
|
186 |
].
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187 |
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188 |
"layout == #around"
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189 |
button1 origin:(bwn @ bwn).
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190 |
button1 viewGravity:#North.
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63
|
191 |
"/ button2 viewGravity:#North.
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59
|
192 |
thumb origin:(bwn @ (button1 height + elementSpacing)).
|
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|
193 |
thumb viewGravity:#North
|
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194 |
!
|
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195 |
|
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196 |
computeInitialExtent
|
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|
197 |
"compute my extent from sub-components"
|
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198 |
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199 |
|w h upForm downForm
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|
200 |
upHeight "{ Class: SmallInteger }"
|
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|
201 |
downHeight "{ Class: SmallInteger }"
|
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202 |
upWidth downWidth|
|
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203 |
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|
204 |
"need fix - this is a kludge;
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205 |
the if should not be needed ..."
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|
206 |
style == #mswindows ifTrue:[
|
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59
|
207 |
w := button1 width max:button2 width.
|
|
|
208 |
h := button1 height + button2 height + (Scroller defaultExtent y).
|
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38
|
209 |
] ifFalse:[
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59
|
210 |
upForm := ArrowButton upArrowButtonForm:style on:device.
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|
211 |
downForm := ArrowButton downArrowButtonForm:style on:device.
|
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|
212 |
upForm isNil ifTrue:[
|
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|
213 |
upHeight := upWidth := 16.
|
|
|
214 |
] ifFalse:[
|
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|
215 |
upHeight := upForm height.
|
|
|
216 |
upWidth := upForm width
|
|
|
217 |
].
|
|
|
218 |
downForm isNil ifTrue:[
|
|
|
219 |
downHeight := downWidth := 16
|
|
|
220 |
] ifFalse:[
|
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|
221 |
downHeight := downForm height.
|
|
|
222 |
downWidth := downForm width
|
|
|
223 |
].
|
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|
224 |
h := upHeight + downHeight + (1 * 2) + (Scroller defaultExtent y).
|
|
|
225 |
w := upWidth max:downWidth.
|
|
|
226 |
style ~~ #normal ifTrue:[
|
|
|
227 |
h := h + 4.
|
|
|
228 |
w := w + 4
|
|
|
229 |
].
|
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38
|
230 |
].
|
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|
231 |
|
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|
232 |
self extent:w @ h.
|
|
0
|
233 |
! !
|
|
|
234 |
|
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|
235 |
!ScrollBar methodsFor:'accessing'!
|
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236 |
|
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237 |
scrollAction:aBlock
|
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|
238 |
"set the action, aBlock to be performed when the scroller is moved"
|
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239 |
|
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|
240 |
thumb scrollAction:aBlock
|
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|
241 |
!
|
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|
242 |
|
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|
243 |
scrollUpAction:aBlock
|
|
|
244 |
"set the action, aBlock to be performed when the up-button is pressed"
|
|
|
245 |
|
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|
246 |
button1 action:aBlock
|
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|
247 |
!
|
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|
248 |
|
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|
249 |
scrollDownAction:aBlock
|
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|
250 |
"set the action, aBlock to be performed when the down-button is pressed"
|
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251 |
|
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|
252 |
button2 action:aBlock
|
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|
253 |
!
|
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|
254 |
|
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|
255 |
thumbColor:aColor
|
|
7
|
256 |
"set the thumbs color"
|
|
|
257 |
|
|
0
|
258 |
thumb thumbColor:aColor
|
|
|
259 |
!
|
|
|
260 |
|
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|
261 |
thumbOrigin
|
|
7
|
262 |
"return position of (top of) thumb in percent"
|
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0
|
263 |
|
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|
264 |
^ thumb thumbOrigin
|
|
|
265 |
!
|
|
|
266 |
|
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|
267 |
thumbOrigin:newOrigin
|
|
|
268 |
"set position of (top of) thumb in percent"
|
|
|
269 |
|
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|
270 |
^ thumb thumbOrigin:newOrigin
|
|
|
271 |
!
|
|
|
272 |
|
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|
273 |
thumbHeight
|
|
7
|
274 |
"return height of thumb in percent"
|
|
0
|
275 |
|
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|
276 |
^ thumb thumbHeight
|
|
|
277 |
!
|
|
|
278 |
|
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|
279 |
thumbHeight:newHeight
|
|
|
280 |
"set height of thumb in percent"
|
|
|
281 |
|
|
|
282 |
^ thumb thumbHeight:newHeight
|
|
|
283 |
!
|
|
|
284 |
|
|
|
285 |
thumbOrigin:newOrigin thumbHeight:newHeight
|
|
|
286 |
"set origin and height of thumb in percent"
|
|
|
287 |
|
|
|
288 |
^ thumb thumbOrigin:newOrigin thumbHeight:newHeight
|
|
|
289 |
!
|
|
|
290 |
|
|
|
291 |
setThumbFor:aView
|
|
|
292 |
"adjust thumb for aView"
|
|
|
293 |
|
|
|
294 |
thumb setThumbFor:aView
|
|
|
295 |
!
|
|
|
296 |
|
|
|
297 |
setThumbHeightFor:aView
|
|
|
298 |
"adjust thumbs height for aView"
|
|
|
299 |
|
|
|
300 |
thumb setThumbHeightFor:aView
|
|
|
301 |
!
|
|
|
302 |
|
|
|
303 |
setThumbOriginFor:aView
|
|
|
304 |
"adjust thumbs origin for aView"
|
|
|
305 |
|
|
|
306 |
thumb setThumbOriginFor:aView
|
|
|
307 |
!
|
|
|
308 |
|
|
|
309 |
asynchronousOperation
|
|
|
310 |
"set asynchronous-mode - scroll action is performed after movement
|
|
|
311 |
of scroller (i.e. when mouse-button is finally released)"
|
|
|
312 |
|
|
|
313 |
thumb asynchronousOperation
|
|
|
314 |
!
|
|
|
315 |
|
|
|
316 |
synchronousOperation
|
|
|
317 |
"set synchronous-mode - scroll action is performed for every movement
|
|
|
318 |
of scroller"
|
|
|
319 |
|
|
|
320 |
thumb synchronousOperation
|
|
|
321 |
! !
|
|
|
322 |
|
|
38
|
323 |
!ScrollBar methodsFor:'forced scroll'!
|
|
|
324 |
|
|
|
325 |
pageUp
|
|
|
326 |
"page up/left"
|
|
|
327 |
|
|
|
328 |
thumb pageUp
|
|
|
329 |
!
|
|
|
330 |
|
|
|
331 |
pageDown
|
|
|
332 |
"page down/right"
|
|
|
333 |
|
|
|
334 |
thumb pageDown
|
|
|
335 |
! !
|
|
|
336 |
|
|
|
337 |
|
|
0
|
338 |
!ScrollBar methodsFor:'events'!
|
|
|
339 |
|
|
|
340 |
sizeChanged:how
|
|
|
341 |
"when my size changes, I have to resize/reposition the subviews"
|
|
|
342 |
|
|
59
|
343 |
|upHeight downHeight thumbHeight upAndDownHeight bwn sep2
|
|
3
|
344 |
thumbWidth w|
|
|
0
|
345 |
|
|
|
346 |
button1 isNil ifTrue:[^ self].
|
|
|
347 |
thumb isNil ifTrue:[^ self].
|
|
|
348 |
button2 isNil ifTrue:[^ self].
|
|
|
349 |
|
|
|
350 |
upHeight := button1 height + borderWidth.
|
|
|
351 |
downHeight := button2 height + borderWidth.
|
|
|
352 |
upAndDownHeight := upHeight + downHeight.
|
|
3
|
353 |
bwn := borderWidth negated + margin.
|
|
0
|
354 |
|
|
59
|
355 |
thumbHeight := height - upAndDownHeight - borderWidth - (elementSpacing * 3).
|
|
3
|
356 |
"
|
|
0
|
357 |
((layout ~~ #top) and:[layout ~~ #bottom]) ifTrue:[
|
|
59
|
358 |
thumbHeight := thumbHeight - borderWidth
|
|
0
|
359 |
].
|
|
3
|
360 |
"
|
|
|
361 |
layout == #around ifTrue:[
|
|
59
|
362 |
thumbHeight := thumbHeight + borderWidth
|
|
3
|
363 |
].
|
|
0
|
364 |
|
|
|
365 |
"if I become too small, hide buttons and thumb"
|
|
|
366 |
|
|
|
367 |
height < (upHeight + downHeight) ifTrue:[
|
|
59
|
368 |
button1 shown ifTrue:[
|
|
|
369 |
button1 unrealize.
|
|
|
370 |
button2 unrealize.
|
|
|
371 |
thumb unrealize
|
|
|
372 |
]
|
|
0
|
373 |
] ifFalse:[
|
|
59
|
374 |
shown ifTrue:[
|
|
|
375 |
button1 shown ifFalse:[
|
|
|
376 |
button1 realize.
|
|
|
377 |
button2 realize.
|
|
|
378 |
thumb realize
|
|
|
379 |
]
|
|
|
380 |
]
|
|
0
|
381 |
].
|
|
|
382 |
|
|
|
383 |
(thumbHeight < 10) ifTrue:[
|
|
59
|
384 |
thumb shown ifTrue:[
|
|
|
385 |
thumb unrealize
|
|
|
386 |
]
|
|
0
|
387 |
] ifFalse:[
|
|
59
|
388 |
thumb shown ifFalse:[
|
|
|
389 |
button1 shown ifTrue:[
|
|
|
390 |
thumb realize
|
|
|
391 |
]
|
|
|
392 |
]
|
|
0
|
393 |
].
|
|
|
394 |
|
|
|
395 |
"width of buttons is always my width"
|
|
|
396 |
|
|
3
|
397 |
w := width - (margin * 2).
|
|
|
398 |
(w ~~ button1 width) ifTrue:[
|
|
59
|
399 |
button1 width:w.
|
|
|
400 |
button2 width:w
|
|
0
|
401 |
].
|
|
|
402 |
|
|
3
|
403 |
thumbWidth := w.
|
|
0
|
404 |
style == #next ifTrue:[
|
|
59
|
405 |
thumbWidth := thumbWidth - (thumb borderWidth * 2).
|
|
|
406 |
thumbHeight := thumbHeight - 1
|
|
0
|
407 |
].
|
|
63
|
408 |
style == #motif ifTrue:[
|
|
|
409 |
thumbHeight := thumbHeight - margin
|
|
|
410 |
].
|
|
0
|
411 |
|
|
38
|
412 |
"
|
|
|
413 |
a kludge: views with width or height of 0 are illegal
|
|
|
414 |
avoid error from view-creation (it will be hidden anyway)
|
|
|
415 |
"
|
|
|
416 |
thumbHeight <= 0 ifTrue:[
|
|
59
|
417 |
thumbHeight := 1
|
|
38
|
418 |
].
|
|
|
419 |
|
|
0
|
420 |
(layout == #top) ifTrue:[
|
|
59
|
421 |
"buttons at top"
|
|
|
422 |
thumb extent:(thumbWidth @ thumbHeight).
|
|
|
423 |
^ self
|
|
0
|
424 |
].
|
|
|
425 |
|
|
59
|
426 |
sep2 := elementSpacing * 2.
|
|
0
|
427 |
(layout == #bottom) ifTrue:[
|
|
59
|
428 |
"buttons at bottom"
|
|
|
429 |
thumbHeight := thumbHeight + borderWidth.
|
|
|
430 |
(how == #smaller) ifTrue:[
|
|
|
431 |
thumb extent:(thumbWidth @ thumbHeight).
|
|
63
|
432 |
"/ button1 origin:(bwn @ (thumbHeight + sep2)).
|
|
|
433 |
"/ button2 origin:(bwn @ (thumbHeight + sep2 + upHeight))
|
|
59
|
434 |
] ifFalse:[
|
|
|
435 |
button1 origin:(bwn @ (thumbHeight + sep2)).
|
|
|
436 |
button2 origin:(bwn @ (thumbHeight + sep2 + upHeight)).
|
|
|
437 |
thumb extent:(thumbWidth @ thumbHeight)
|
|
|
438 |
].
|
|
|
439 |
^ self
|
|
0
|
440 |
].
|
|
|
441 |
"buttons around thumb"
|
|
|
442 |
|
|
63
|
443 |
style == #motif ifTrue:[
|
|
|
444 |
sep2 := sep2 + 1
|
|
|
445 |
].
|
|
3
|
446 |
button1 origin:(bwn @ bwn).
|
|
38
|
447 |
button2 origin:(bwn @ (upHeight + thumbHeight + sep2 - (margin // 2) "+ borderWidth")).
|
|
|
448 |
thumb extent:(thumbWidth @ (thumbHeight + margin - (margin // 2))).
|
|
59
|
449 |
thumb origin:(bwn @ (upHeight - borderWidth + elementSpacing))
|
|
0
|
450 |
! !
|