Class: AbstractBackground

• Inheritance
• Description
• Related information
• Class protocol
  • queries
• Instance protocol
  • drawing
  • ignored conversion
  • testing
• Examples

Inheritance:

   Object
   |
   +--AbstractBackground
      |
      +--DiffTextView::DiffTextScrollerBackground
      |
      +--GradientBackground
      |
      +--ImageBackground
      |
      +--NoBackground
      |
      +--SolidBackground
      |
      +--Tools::CodeView2::AnnotationShowingScrollerBackground

Package:

stx:libview

Category:

Graphics-Support

Version:

rev: 1.9 date: 2017/02/22 20:20:31

user: cg

file: AbstractBackground.st directory: libview

module: stx stc-classLibrary: libview

Author:

Claus Gittinger

Description:

This will replace the viewBackground color.
Instances of me (and subclasses) can be set as a widget's
viewBackground, and will get 
    fillRectangleX:x y:y width:w height:h in:aView
messages whenever the widget wants to redraw (parts of) its background.

See the example in GradientBackground.

Related information:

    GradientBackground

Class protocol:

 isAbstract

Return if this class is an abstract class.
True is returned here for myself only; false for subclasses.
Abstract subclasses must redefine this again.

Instance protocol:

 fillRectangleX: x y: y width: w height: h in: aView

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

 asFormOn: aDevice

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

 onDevice: aDevice

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

 isViewBackground

 needsFullRedrawOnChangeOfHeight

 needsFullRedrawOnChangeOfWidth

Examples: