Class: Renderer (private in ListModelView

• Inheritance
• Description
• Class protocol
  • instance creation
• Instance protocol
  • change & update
  • displaying
  • instance creation
  • queries-dimensions

Inheritance:

   Object
   |
   +--ListModelView::Renderer
      |
      +--ListModelView::TableRenderer

Package:

stx:libwidg2

Category:

Views-Lists

Owner:

ListModelView

Description:

prepared for ListItemRenderer
.... SelectionItemRenderer ...

goal:
    allow the user to redefine the display operation and the dimesion queries

Class protocol:

 forView: aView

Instance protocol:

 listWillChange

called before the list changed, clear caches etc.
here nothing is done

 withinUpdateFromListDo: aBlock

handle an update from the list

 display: anItem atX: xLeft y: yTop lineHeight: h

display the item on the view

 postRedrawX: damageX y: yStartOrYDamage w: damageWidth from: startOrNil to: stopOrNil

called after redraw of the items in range from start to stop is done;
if no items are damaged, start and stop is set to nil.

 validateDrawableItemsFrom: start to: stop

called before drawing items from start to stop; if the method returns false
nothing will be drawn and a invalidate is pushed on the event queue.
On default true is returned.

 forView: aView

 mapped

called if the view is mapped; can be redefined by subclass

 release

called if the view is gone; can be redefined by subclass

 heightFor: anItem

returns the height of an item on the view

 maxItemWidthOrNil

returns the maximum item width for drawing or nil
if unspecified (the default); used for cliping

 widthFor: anItem

returns the width of an item on the view

 widthOfWidestLineBetween: firstLine and: lastLine

returns the width of the longest line in pixels in a range; if the rendere
cannot compute the width, nil is returned (the default).