Class: PseudoDeviceWithoutXFTSupport (private in XWorkstation

• Inheritance
• Description
• Instance protocol
  • accessing
  • message forwarding
  • queries

Inheritance:

   Object
   |
   +--XWorkstation::PseudoDeviceWithoutXFTSupport

Package:

stx:libview

Category:

Interface-Graphics

Owner:

XWorkstation

Author:

cg

Description:

this is a proxy device, which forwards its messages to a real device,
possibly overriding some messages.
It is currently only used as a hack (workaround) a bug in the XWindows
interface, which cannot draw strings into pixmaps using XFT fonts.
For this, a pseudoDevice instance is set as device into the pixmap's GC,
so it will draw using non-xft fonts.
This should vanish, once the xft drawing works.

Instance protocol:

 realDevice: aDevice

 doesNotUnderstand: aMessage

(comment from inherited method)
this message is sent by the runtime system (VM) when
a message is not understood by some object (i.e. there
is no method for that selector). The original message has
been packed into aMessage (i.e. the receiver, selector and
any arguments) and the original receiver is then sent the
#doesNotUnderstand: message.
Here, we raise another signal which usually enters the debugger.
You can of course redefine #doesNotUnderstand: in your classes
to implement message delegation,
or handle the MessageNotUnderstood exception gracefully.

 deviceFonts

 supportsXftFonts