Class: HostGraphicsDevice

• Inheritance
• Description
• Instance protocol
  • Compatibility-Squeak
  • accessing
  • accessing & queries
  • initialization & release
  • misc
  • registration

Inheritance:

   Object
   |
   +--GraphicsDevice
      |
      +--HostGraphicsDevice
         |
         +--DeviceWorkstation

Package:

stx:libview

Category:

Interface-Graphics

Version:

rev: 1.34 date: 2021/01/20 14:35:25

user: cg

file: HostGraphicsDevice.st directory: libview

module: stx stc-classLibrary: libview

Description:

this abstract class was inserted to provide a home for ST-80 classes
(previously, DeviceWorkstation was directly under Object).
We will (over time) move common functionality from there into this class.

In ST/X, this is mostly dummy.

copyright
COPYRIGHT (c) 1997 by eXept Software AG / 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.

Instance protocol:

 deferUpdates: aBoolean

Set the deferUpdates flag in the virtual machine.
When this flag is true, BitBlt operations on the Display are not
automatically propagated to the screen.
If this underlying platform does not support deferred updates,
this primitive will fail.
Answer the receiver if the primitive succeeds, nil if it fails.

 forceDisplayUpdate

On platforms that buffer screen updates,
force the screen to be updated immediately.
On other platforms, or if the primitive is not implemented, do nothing.

 deviceColors

return the registry keeping track of colors which were allocated
on this device.

 deviceCursors

return the registry keeping track of cursors which were allocated
on this device.

 deviceFonts

return the registry keeping track of fonts which were allocated
on this device.

 graphicsContexts

return the registry keeping track of graphics contexts which were allocated
on this device.

 defaultExtentForTopViews

 initializeDeviceResourceTables

 releaseDeviceColors

TrueColors are not registered.
Release them the hard way

 releaseDeviceCursors

 releaseDeviceFonts

 releaseGraphicsContexts

 recolorCursorsToFgColor: fgColor defaultBgColor: bgColor

change the colors of all existing cursors

Usage example(s):

Display recolorCursorsToFgColor:(Color red) defaultBgColor:(Color white) Display recolorCursorsToFgColor:(Color blue) defaultBgColor:(Color white) Display recolorCursorsToFgColor:(Color blue) defaultBgColor:(Color black) Display recolorCursorsToFgColor:(Color white) defaultBgColor:(Color black) Display recolorCursorsToFgColor:(Color white) defaultBgColor:(Color red)

 cleanupLobbyForChildrenOfViewWithId: anId

recursively clean all the subcomponents of the handle with id anId.
This must be done on finalization, because descendent handles
are destroyed implicitly when a parent handle is destroyed.

 registerColor: aColor

 registerCursor: aCursor

 registerFont: aFont

 registerGraphicsContext: aGC

 unregisterColor: aColor

 unregisterCursor: aCursor

 unregisterFont: aFont

 unregisterGraphicsContext: aGC