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

# Reference for unit 'StdCtrls'

Several standard controls used in most Lazarus forms

`uses`
`System,`
`Classes,`
`sysutils,`
`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.
`LCLProc,` |  | Useful lower level helper functions and classes
`LMessages,` |  |
`Graphics,` |  | Unit contains definitions for many fundamental classes and types used in graphic applications
`GraphType,` |  | Definitions of several special types (including Raw Image) to be used for graphics
`ExtendedStrings,` |  | Defines TExtendedStrings which is a normal TStringList, except that the Objects can hold any type of records
`LCLIntf,` |  | Contains winapi like functions for Delphi compatibility
`Clipbrd,` |  | Definitions for the Clipboard to hold Cut or Copied data for Pasting
`ActnList,` |  | Defines classes for Actions and Lists of actions to be used with LCL components
`Controls,` |  | This unit contains basic classes for visual controls.
`TextStrings,` |  | TTextStrings describes a TStrings descendant that is optimized for handling the complete text as whole (instead of line by line)
`Forms,` |  | Contains definitions and descriptions for constructing the Forms which are the basis of the Lazarus Graphical User Interface
`Menus,` |  | Menus to be used in Forms created with the Lazarus IDE
`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

`HowToUseStdCtrls` |  | How to use StdCtrls, ComCtrls or ExtCtrls

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