"

 COPYRIGHT (c) 1989 by Claus Gittinger

	      All Rights Reserved

 This software is furnished under a license and may be used

 only in accordance with the terms of that license and with the

 inclusion of the above copyright notice.   This software may not

 be provided or otherwise made available to, or used by, any

 other person.  No title to or ownership of the software is

 hereby transferred.

"

TopView subclass:#PopUpView

	 instanceVariableNames:'shadowView haveControl exclusivePointer'

	 classVariableNames:'DefaultShadow DefaultLevel DefaultBorderWidth DefaultBorderColor'

	 poolDictionaries:''

	 category:'Views-Basic'

!

!PopUpView class methodsFor:'documentation'!

copyright

"

 COPYRIGHT (c) 1989 by Claus Gittinger

	      All Rights Reserved

 This software is furnished under a license and may be used

 only in accordance with the terms of that license and with the

 inclusion of the above copyright notice.   This software may not

 be provided or otherwise made available to, or used by, any

 other person.  No title to or ownership of the software is

 hereby transferred.

"

!

documentation

"

    this class implements an abstract superclass for all views which bypass the 

    window manager and pop up on top of the screen. A typical example is

    a PopUpMenu. PopUpView itself is abstract, providing basic mechanisms.

    They are not decorated by window managers.

    styleSheet parameters:

	popupShadow         <Boolean>           if true, popupViews show a shadow below

	popupLevel          <nil | Integer>     3D level

	popupBorderWidth    <nil | Integer>     borderWidth

"

! !

!PopUpView class methodsFor:'defaults'!

defaultExtent

    ^ (Display width // 3) @ (Display height // 3)

!

shadows

    "return the shadows-flag. False means: turned off."

    ^ DefaultShadow

!

shadows:aBoolean

    "turn on/off shadows under popUpViews. 

     On slow displays, turning them off makes menus appear a bit snappier.

     The default is set via the styleSheet and changes when the viewStyle

     is changed."

    DefaultShadow := aBoolean

!

updateStyleCache

    ShadowView isNil ifTrue:[

	DefaultShadow := false

    ] ifFalse:[

	DefaultShadow := StyleSheet at:'popupShadow' default:false.

    ].

    DefaultLevel := StyleSheet at:'popupLevel'.

    DefaultBorderWidth := StyleSheet at:'popupBorderWidth'.

    DefaultBorderColor := StyleSheet colorAt:'popupBorderColor'.

! !

!PopUpView methodsFor:'accessing'!

exclusivePointer:aBoolean

    exclusivePointer := aBoolean

!

noShadow

    "turn off the shadow"

    shadowView := nil

! !

!PopUpView methodsFor:'activation'!

hide

    "hide the view, leave its modal event loop"

    windowGroup notNil ifTrue:[

	windowGroup removeView:self.

	windowGroup := nil.

    ].

    self unrealize.

!

show

    "realize the view at its last position"

    self fixSize.

    self openModal:[true] "realize     "

!

showAt:aPoint

    "realize the view at aPoint"

    self showAt:aPoint resizing:true 

!

showAt:aPoint resizing:aBoolean

    "realize the view at aPoint"

    aBoolean ifTrue:[

	self fixSize.

    ].

    self origin:aPoint.

    self makeFullyVisible.

    self openModal:[true] "realize     "

!

showAtPointer

    "realize the view at the current pointer position"

    self showAt:(device pointerPosition) resizing:true

!

showCenteredIn:aView

    "make myself visible at the screen center."

    |top|

    top := aView topView.

    top raise.

    self showAt:(top origin 

		 + (aView originRelativeTo:top) 

		 + (aView extent // 2)

		 - (self extent // 2))

! !

!PopUpView methodsFor:'dispatching'!

modalLoop

    haveControl := true.

    "this is a kludge - we do not have multiple processes, therefore

     we start another dispatch loop, which exits when control is lost"

    device dispatchFor:nil while:[haveControl]

! !

!PopUpView methodsFor:'initialize / release'!

create

    super create.

    shadowView isNil ifTrue:[

	self saveUnder:true

    ]

!

destroy

    haveControl := false.

    super destroy.

    shadowView notNil ifTrue:[shadowView destroy. shadowView := nil]

!

initStyle

    super initStyle.

    styleSheet is3D == true ifTrue:[

	borderWidth := 0.

	level := 2

    ] ifFalse:[

	borderWidth := 1.

	level := 0

    ].

    DefaultBorderColor notNil ifTrue:[

	self borderColor:(DefaultBorderColor on:device).

    ].

    DefaultBorderWidth notNil ifTrue:[

	borderWidth := DefaultBorderWidth.

    ].

"/    DefaultEdgeStyle notNil ifTrue:[

"/        edgeStyle := DefaultEdgeStyle.

"/    ].

    DefaultLevel notNil ifTrue:[

	self level:DefaultLevel.

    ].

    DefaultShadow ifTrue:[

	shadowView := (ShadowView onDevice:device) for:self.

    ].

!

initialize

    super initialize.

    exclusivePointer := true.

    haveControl := false.

    type := #popup 

!

releasePointer 

    device activePointerGrab == self ifTrue:[

	device ungrabPointer.

    ].

! !

!PopUpView methodsFor:'private'!

leaveControl

    haveControl := false

!

regainControl

    device grabPointerInView:self 

!

takeControl

^ self.

    haveControl := true.

    "this is a kludge - we do not have multiple processes, therefore

     we start another dispatch loop, which exits when control is lost"

    device dispatchFor:drawableId while:[haveControl]

! !

!PopUpView methodsFor:'queries'!

isPopUpView

    ^ true

! !

!PopUpView methodsFor:'realize / unrealize'!

mapped

    "grab the pointer here, when visible (but not control is already lost). 

     If the grab fails, try again and unrealize myself if that fails too."

    super mapped.

    (haveControl 

    and:[true "/ exclusivePointer

    and:[realized]]) ifTrue:[

	(device grabPointerInView:self) ifFalse:[

	    "wait a little bit and try again"

"/            'grab pointer failed' errorPrintNL.

	    Delay waitForSeconds:0.1.

	    (device grabPointerInView:self) ifFalse:[

		"give up"

		'could not grab pointer' errorPrintNL.

		self unrealize

	    ]

	].

	exclusivePointer ifFalse:[

	    self releasePointer

	].

    ]

!

realize

    shadowView notNil ifTrue:[shadowView realize].

    self raise.

    haveControl := true.

    super realize.

!

restarted

    ^ self

!

unrealize

    haveControl := false.

    device activePointerGrab == self ifTrue:[

	device ungrabPointer.

    ].

    super unrealize.

    shadowView notNil ifTrue:[shadowView unrealize].

! !

!PopUpView class methodsFor:'documentation'!

version

! !