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"
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COPYRIGHT (c) 1992 by Claus Gittinger
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80
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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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Object subclass:#Controller
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instanceVariableNames:'model view'
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classVariableNames:''
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poolDictionaries:''
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category:'Interface-Support'
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!
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Controller comment:'
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46
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COPYRIGHT (c) 1992 by Claus Gittinger
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80
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All Rights Reserved
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54
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92
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$Header: /cvs/stx/stx/libview/Controller.st,v 1.10 1995-02-07 15:30:29 claus Exp $
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'!
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0
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!Controller class methodsFor:'documentation'!
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copyright
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"
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COPYRIGHT (c) 1992 by Claus Gittinger
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80
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All Rights Reserved
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0
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46
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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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0
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version
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"
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92
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$Header: /cvs/stx/stx/libview/Controller.st,v 1.10 1995-02-07 15:30:29 claus Exp $
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"
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!
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documentation
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"
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Controllers can be used to controll the user-interactions
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89
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to a model which is shown in a view. For very simple views,
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(and due to the evolution of Smalltalk/X) many view-classes have
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the controller function integrated.
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80
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To allow both controller and non-controller operation, events are
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sent directly to the view, if its controller instance variable
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is nil. Otherwise, the controller gets the event.
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89
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For now (vsn 2.10.4) there are only a few view classes using controllers;
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however, over time, more will be converted, since separating the controller
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offers much more flexibility (although view initialization becomes a bit more complex).
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Instance variables:
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view aView the view I controll
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model aModel the model which is to be worked on
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"
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! !
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!Controller class methodsFor:'instance creation'!
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new
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^ self basicNew initialize
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! !
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!Controller methodsFor:'initialize / release'!
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initialize
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"initialize the controller; subclasses should redefine
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this and include a super initialize for proper initialization."
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^ self
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!
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startUp
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"startup the controller; this is sent when the view realizes,
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right before it becomes visible.
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Can be redefined in subclasses to do some startup action."
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^ self
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!
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release
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"close down the controller; this is sent when the view is destroyed.
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Can be redefined in subclasses to do some cleanup action. However,
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these redfined methods should do a super release."
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view controller:nil.
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view := nil.
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model := nil
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! !
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!Controller methodsFor:'accessing'!
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view:aView
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"set my view"
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view notNil ifTrue:[
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model notNil ifTrue:[
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model removeDependent:view
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]
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].
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view := aView.
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model notNil ifTrue:[
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model addDependent:view
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].
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!
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view
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"return my view"
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^ view
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!
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model:aModel
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"set my model"
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model notNil ifTrue:[
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model removeDependent:view
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].
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model := aModel.
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model notNil ifTrue:[model addDependent:view]
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!
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model
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"return my model"
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^ view model
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! !
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!Controller methodsFor:'event handling'!
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redButtonActivity
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"actually, this should be called 'leftButtonActivity'.
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But for ST-80 compatibility ...."
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^ self
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!
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yellowButtonActivity
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"actually, this should be called 'middleButtonActivity'.
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But for ST-80 compatibility ...."
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|sym menu actionSelector|
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"
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try ST-80 style menus first:
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if there is a model, and a menuSymbol is defined,
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ask model for the menu and launch that if non-nil.
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"
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(model notNil
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and:[(sym := view menuSymbol) notNil
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and:[sym isSymbol]]) ifTrue:[
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"
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ask model for the menu
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"
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menu := model perform:sym.
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menu notNil ifTrue:[
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"
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got one, launch the menu. It is supposed
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to return an actionSelector.
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"
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actionSelector := menu startUp.
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(actionSelector notNil
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and:[actionSelector isSymbol]) ifTrue:[
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model perform:actionSelector
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]
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].
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^ self
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].
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view middleButtonMenu notNil ifTrue:[
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view middleButtonMenu showAtPointer
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]
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!
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blueButtonActivity
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"actually, this should be called 'rightButtonActivity'.
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But for ST-80 compatibility ...."
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^ self
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! !
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!Controller methodsFor:'low level events'!
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buttonPress:button x:x y:y
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"a mouse button was pressed in my view.
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Translate buttonPress events into similar ST-80 type
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event messages. This method and/or these ST-80 methods
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can be redefined in subclasses"
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((button == 1) or:[button == #select]) ifTrue:[
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self redButtonActivity
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].
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((button == 2) or:[button == #menu]) ifTrue:[
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self yellowButtonActivity
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].
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(button == 3) ifTrue:[
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self blueButtonActivity
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]
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!
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buttonRelease:button x:x y:y
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"a mouse button was released in my view; nothing done here"
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^ self
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!
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buttonMotion:buttonMask x:x y:y
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"mouse was moved with button pressed in my view; nothing done here"
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^ self
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!
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pointerEnter:state x:x y:y
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"mouse pointer entered my view; nothing done here"
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^ self
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!
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pointerLeave:state
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"mouse pointer left my view; nothing done here"
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^ self
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!
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keyPress:key x:x y:y
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"key was pressed in my view; nothing done here"
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^ self
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!
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keyRelease:key x:x y:y
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"key was released in my view; nothing done here"
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^ self
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! !
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