[Overview][Constants][Types][Classes][Procedures and functions][Variables][Index] | Reference for unit 'Controls' (#lcl)

# Reference for unit 'Controls'

This unit contains basic classes for visual controls.

`uses`
`System,`
`Classes,`
`sysutils,`
`typinfo,`
`types,`
`LCLStrConsts,` |  | This unit contains all resource strings of the LCL
`LCLType,` |  | This unit is being created specifically for compatibility with Delphi. It should only be used for constants and type definitions that are included in the Delphi Windows unit. This is only done for compatibiltiy.
`AvgLvlTree,` |  | An Average Level Tree structure, which is kept balanced so that finding a node is very rapid
`LCLProc,` |  | Useful lower level helper functions and classes
`GraphType,` |  | Definitions of several special types (including Raw Image) to be used for graphics
`Graphics,` |  | Unit contains definitions for many fundamental classes and types used in graphic applications
`LMessages,` |  |
`LCLIntf,` |  | Contains winapi like functions for Delphi compatibility
`InterfaceBase,` |  | Provides a widget set appropriate to the operating system platform in use
`ImgList,` |  | Contains definitions for TCustomImageList. base class for TImageList
`UTrace,` |  |
`PropertyStorage,` |  |
`Menus,` |  | Menus to be used in Forms created with the Lazarus IDE
`ActnList,` |  | Defines classes for Actions and Lists of actions to be used with LCL components
`LCLClasses,` |  | Defines the base class for all LCL TComponents including controls
`LResources;` |  | This unit maintains and stores all lazarus resources in the global list named LazarusResources and provides methods and types to stream components

## Related topics

`Control coordinates` |  | The coordinates of a control can be specified or retrieved in various ways.
`AutoSize` |  | AutoSize - boolean property that permits the size of a control to be adjusted automatically

The latest version of this document can be found at lazarus-ccr.sourceforge.net.