Class: DeviceHandle

• Inheritance
• Description
• Related information
• Instance protocol
  • accessing
  • finalization
  • private-accessing

Inheritance:

   Object
   |
   +--DeviceHandle
      |
      +--DisplaySurface::DeviceViewHandle
      |
      +--Form::DeviceFormHandle

Package:

stx:libview

Category:

Graphics-Support

Version:

rev: 1.14 date: 2005/12/13 19:07:31

user: stefan

file: DeviceHandle.st directory: libview

module: stx stc-classLibrary: libview

Author:

Claus Gittinger

Description:

This is an abstract class for device handles which are responsible
for finalization i.e. to destroy underlying system resources, when the GC
frees an object which has created some system object.
Currently, these are forms and views (streams, cursors, colors and
fonts could also make use of this class - however, for historical reasons,
they continue to use their own private finalization machanisms. This may
change in future versions).

Related information:

    DeviceDrawable

Instance protocol:

 device

 id

return the id of the dravable

 parentId

 finalize

I am abstract

** This method raises an error - it must be redefined in concrete classes **

 setDevice: aDevice id: aDrawableId gcId: aGCId

set the handles contents

 setDevice: aDevice id: aDrawableId gcId: aGCId parentId: parentIdArg

set the handles contents