Class: ShadowView

• Inheritance
• Description
• Instance protocol
  • accessing
  • event handling
  • initialization

Inheritance:

   Object
   |
   +--GraphicsMedium
      |
      +--DisplaySurface
         |
         +--SimpleView
            |
            +--ShadowView

Package:

stx:libview

Category:

Views-Special

Version:

rev: 1.44 date: 2021/03/14 14:30:47

user: cg

file: ShadowView.st directory: libview

module: stx stc-classLibrary: libview

Description:

ShadowView exists just to give PopUps and ModalBoxes a shadow. 

If shadowClr is nil, the shadowView reads the screen-contents under
itself before realization, and uses a greyed version of these pixels
for its background. If shadowClr is non-nil, that color is used
as shadow (can be used for solid-black shadows).

The instance variable myView is the view, for which the shadow is for.

copyright
COPYRIGHT (c) 1991 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.

Instance protocol:

 for: aView

set the view I am a shadow for

 isPopUpView

return true, since I want to come up without decoration

 shadowColor: aColor

set the shadow color

 redraw

if I have a shadowColor, fill all of myself with it;
otherwise, draw the saved image under myself.

 create

enable saveUnder of the covered view(s).
This may not be supported by all devices - these have to redraw then

 initialize

the length of the shadow from myView

 realize

realize the shadowView some distance away from myView,
get the pixels under the shadow from the screen

 recreate

sent after a snapin or a migration, reinit for new device

 unmap

unmap the view - the view stays created (but invisible), and can be remapped again later.
Release the saved image of the covered view