"

 COPYRIGHT (c) 1992 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.

"

"{ Package: 'stx:libview' }"

"{ NameSpace: Smalltalk }"

GraphicsMedium subclass:#DisplaySurface

	instanceVariableNames:'viewBackground cursor eventMask moreAttributes renderer uuid

		backed flags delegate updateRegion'

	classVariableNames:'SaveUnderFlagMask GotExposeFlagMask'

	poolDictionaries:''

	category:'Graphics-Support'

!

!DisplaySurface class methodsFor:'documentation'!

copyright

"

 COPYRIGHT (c) 1992 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 abstract class describes stuff common to any Window on a display

    device. i.e. RootWindow, TopWindows, PopUps and Subwindows.

    That is, they have a viewBackground, cursor etc. and especially events.

    A special feature is the delegate field, which allows key- and button

    events to be stolen from a view.

    If the delegate is non-nil, these events will be sent to it instead.

    So you can change a views behavior even if it was not initially designed

    for it. Also, controller functionality could be simulated using delegates.

    [instance variables:]

	viewBackground  <Color|Form|Image>      the views background

	cursor          <Cursor>                the cursor

	eventMask                               mask specifying the enabled

						events.

	moreAttributes                          optional dictionary, allowing for more attributes

						to be store there

	    fields:

		middleButtonMenu                a fix popup menu for the middle button.

		keyCommands                     not yet supported

	backed                                  one of #always, #whenMapped or #never

						corresponds to X's backing store mechanism.

						May be ignored by other devices.

	flags                                   flag bits

	    saveUnder                               bit 1; 1 if saveunder store for

							    that view is enabled

	    gotExpose                               bit 2; 1 if an expose/noExpose event arrived

							    (for exposure handling after a scroll)

       delegate                                for event delegation

    [see also:]

	DeviceWorkstation

	WindowGroup

	StandardSYstemView SimpleView View

    [author:]

	Claus Gittinger

"

! !

!DisplaySurface class methodsFor:'initialization'!

initialize

    SaveUnderFlagMask := 1.

    GotExposeFlagMask := 2.

! !

!DisplaySurface methodsFor:'accessing'!

addUpdateRectangle:newRectangle

    "return true, if the newRectangle is not already contained in the updateRegion

     (i.e. if it added any pixels to the region"

    |closure lastRect numRect lastTop lastBottom lastLeft lastRight

     newTop newBottom newLeft newRight|

    updateRegion isNil ifTrue:[

    ].

    (updateRegion contains:[:oldRectangle | (newRectangle isContainedIn:oldRectangle)]) ifTrue:[

    ].

    numRect := updateRegion size.

    numRect > 20 ifTrue:[

    ].

    lastRect := updateRegion at:numRect.

    lastTop := lastRect top.

    lastBottom := lastRect bottom.

    lastLeft := lastRect left.

    lastRight := lastRect right.

    newTop := newRectangle top.

    newBottom := newRectangle bottom.

    newLeft := newRectangle left.

    newRight := newRectangle right.

    lastTop = newTop ifTrue:[

    ].

    lastLeft = newLeft ifTrue:[

    ].

    updateRegion add:newRectangle.

    ^ true

!

basicViewBackground:something

    "set the viewBackground to something, a color, image or form.

     The viewBackground is the color or pattern with which exposed

     regions are filled - do not confuse this with the drawing background

     color, which is used with opaque drawing."

    viewBackground ~~ something ifTrue:[

	viewBackground := something.

	    self setViewBackground

	]

    ]

!

controller

    "return nil - I have no controller"

    ^ nil

!

depth

    "return the depth in pixels of the view.

     Notice, that this is currently the devices depth,

     but support for mixed depth views is being prepared.

     (especially useful on SGI, with 24bit view)"

    ^ device depth

!

insideColor:aColor

    "set the views background color - ST-80 compatibility"

    self viewBackground:aColor.

    self background:aColor

!

keyboardMap

    "by default, use my devices standard mapping.

     However, subclasses may redefine this, to return their own

     keyboard map (for example a terminalView may want treat CTRL-C as regular key)"

    ^ device keyboardMap

!

renderer

    "warning: this is experimental and not yet implemented"

    ^ renderer

!

renderer:something

    "warning: this is experimental and not yet implemented"

    renderer := something.

!

sensor

    "I can only return a SynchronousWindowSensor,

     since I do not have a window group"

    ^ SynchronousWindowSensor new

!

setViewBackground

    "install the viewBackground for the receiver on the device"

    |id devBgPixmap bgPixmap w h colorMap

     pixmapDepth deviceDepth defBG|

    ]

    "Modified: / 23-01-2011 / 01:44:38 / cg"

!

updateRegion

    ^ updateRegion

!

updateRegion:something

    updateRegion := something.

!

viewBackground

    "return the viewBackground"

    ^ viewBackground

!

viewBackground:something

    "set the viewBackground to something, a color, image or form.

     The viewBackground is the color or pattern with which exposed

     regions are filled - do not confuse this with the drawing background

     color, which is used with opaque drawing."

    viewBackground ~~ something ifTrue:[

	self basicViewBackground:something

    ]

!

viewBackgroundAndClear:something

    "set the viewBackground to something, a color, image or form.

     and clear the View.

     The viewBackground is the color or pattern with which exposed

     regions are filled - do not confuse this with the drawing background

     color, which is used with opaque drawing."

    self viewBackground:something.

    self clearView.

    "Created: 27.4.1996 / 14:09:08 / cg"

!

viewGravity

    "return the views gravity"

    ^ #NorthWest

!

viewOrigin

    "0@0 here, since by default we cannot be scrolled"

    ^ 0 @ 0

!

widget

    "ST-80 compatibility"

    ^ self

!

windowGroup

    "return nil - I have no windowGroup"

    ^ nil

! !

!DisplaySurface methodsFor:'accessing-cursor'!

cursor

    "return the views cursor"

    ^ cursor

!

cursor:aCursor

    "set the views cursor. This cursor will be automatically displayed whenever

     the mouse-pointer enters the receiver.

     Cursors are typically set at view creation time and left as installed."

    self cursor:aCursor now:true

    "

     |v|

     v := View new.

     v cursor:(Cursor wait).

     v open.

     [v shown] whileFalse:[Processor yield].

     [v shown] whileTrue:[

	(Delay forSeconds:1) wait.

	v cursor:(Cursor normal).

	(Delay forSeconds:1) wait.

	v cursor:(Cursor wait).

     ]

    "

    "Modified: 14.12.1995 / 21:28:14 / cg"

!

cursor:aCursor now:showImmediately

    "set the views cursor. This cursor will be automatically displayed whenever

     the mouse-pointer enters the receiver.

     Cursors are typically set at view creation time and left as installed."

    aCursor notNil ifTrue:[

    ]

    "

     |v|

     v := View new.

     v cursor:(Cursor wait).

     v open.

     [v shown] whileFalse:[Processor yield].

     [v shown] whileTrue:[

     ]

    "

    "Created: 14.12.1995 / 21:28:00 / cg"

    "Modified: 28.3.1997 / 13:47:58 / cg"

!

setCursor

    |id|

    cursor isNil ifTrue:[ ^ self].

    cursor := cursor onDevice:device.

    cursor isNil ifTrue:[ ^ self].