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COPYRIGHT (c) 2017 by eXept Software AG
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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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"{ Package: 'stx:libwidg' }"
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"{ NameSpace: Smalltalk }"
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ButtonController subclass:#DragRectangleController
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instanceVariableNames:'action startPoint lastX lastY'
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classVariableNames:''
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poolDictionaries:''
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category:'Interface-Support-Controllers'
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!
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!DragRectangleController class methodsFor:'documentation'!
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copyright
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"
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COPYRIGHT (c) 2017 by eXept Software AG
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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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!
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documentation
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"
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drags a rectangle
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"
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!
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examples
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"
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|v c|
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v := View new openAndWait.
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c := DragRectangleController new.
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c action:[:rect | Transcript showCR:rect ].
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v openAndWait.
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v controller:c.
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"
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! !
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!DragRectangleController class methodsFor:'utilities'!
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dragRectangleIn:aView thenDo:action
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"drag a rectangle in aView"
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|dragController oldController oldCursor|
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dragController := DragRectangleController new.
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dragController view:aView.
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oldController := aView controller.
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oldCursor := aView cursor.
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aView cursor:Cursor origin.
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dragController action:[:rectOrNil |
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|image|
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aView controller:oldController.
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aView cursor:oldCursor.
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action value:rectOrNil.
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].
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aView controller:dragController.
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! !
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!DragRectangleController methodsFor:'accessing'!
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action:aBlock
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"set the block which will be called when the rectangle drag is finished.
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The block will be called with a nil arg, if escape is pressed"
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action := aBlock
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!
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lastMousePoint
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lastX isNil ifTrue:[^ nil].
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^ lastX @ lastY
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!
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startPoint
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^ startPoint
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! !
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!DragRectangleController methodsFor:'event handling'!
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buttonMotion:buttonState x:x y:y
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(buttonState == 0 or:[startPoint isNil]) ifTrue:[
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super buttonMotion:buttonState x:x y:y.
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^ self
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].
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lastX notNil ifTrue:[
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view xoring:[
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view displayRectangle:(startPoint corner:(lastX@lastY))
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].
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].
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lastX := x.
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lastY := y.
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startPoint ~= (x@y) ifTrue:[
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view xoring:[
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view displayRectangle:(startPoint corner:(lastX@lastY))
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].
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].
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!
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buttonPress:button x:x y:y
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startPoint := x@y.
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view cursor:(Cursor corner).
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!
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buttonRelease:button x:x y:y
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|rect|
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startPoint isNil ifTrue:[
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super buttonRelease:button x:x y:y.
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^ self
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].
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lastX notNil ifTrue:[
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view xoring:[
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view displayRectangle:(startPoint corner:(lastX@lastY))
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].
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].
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rect := startPoint corner:(lastX@lastY).
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startPoint := lastX := lastY := nil.
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action value:rect.
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!
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keyPress:key x:x y:y
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startPoint isNil ifTrue:[
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super keyPress:key x:x y:y.
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^ self
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].
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lastX notNil ifTrue:[
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view xoring:[
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view displayRectangle:(startPoint corner:(lastX@lastY))
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].
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].
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startPoint := nil.
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action value:nil.
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! !
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!DragRectangleController class methodsFor:'documentation'!
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version
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^ '$Header$'
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!
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version_CVS
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^ '$Header$'
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! !
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