TBackend

Hierarchy

TPersistent

Description

The TBackend class is the base class for all back-end classes. It defines the bare minimum functionality required to implement a new back-end class. It provides simplified management of surface (re-)allocation and deallocation by implementing ChangeSize in a convenient way. New back-ends shall implement the abstract protected methods InitializeSurface and FinalizeSurface.

It also implements the necessary Assign method for switching back-ends while preserving the surface's contents.

Reference

Fields	Properties	Methods	Events
In TBackend:
	Bits	Assign	OnChanging
		ChangeSize
		Changing
		Clear
		Create
		Destroy
		Empty
		FinalizeSurface
		InitializeSurface
In TThreadPersistent:
	LockCount	Lock
		Unlock
In TNotifiablePersistent:
	UpdateCount	BeginUpdate	OnChange
		Changed
		EndUpdate