InterfaceBase unit

Provides a platform-independent widgetset class and helper functions.

interfacebase.pp contains classes, types, and routines used to define a platform-independent widgetset class ( TWidgetSet) and helper functions.

Modified in LCL version 3.0 to assign the GetLCLWidgetTypeName routine in this unit to the OnLCLWidgetTypeName function variable in lazversion.pas during unit initialization.

interfacebase.pp is part of the Lazarus Component Library ( LCL).

Classes and records

`EInterfaceCritical`	class	Exception raised in the LCL interface.
`EInterfaceError`	class	Exception raised in the LCL interface.
`EInterfaceException`	class	Base class for exceptions raised in the LCL interface.
`EInterfaceWarning`	class	Exception raised in the LCL interface.
`TDialogButton`	class	Implements a standard dialog button.
`TDialogButtons`	class	Collection used to store TDialogButton instances.
`TMessageDispatcher`	class	Implements a class used to dispatch messages originating in a widgetset class to a handler routine in the LCL class instance.
`TWidgetSet`	class	Provides an application helper class (platform and drawing interface).

Procedures and functions

`GetDefaultLCLWidgetType`	function	Gets the enumeration value representing the LCL platform for the current widgetset.
`GetLCLWidgetTypeName`	function	Gets the directory name for the LCL platform enumeration value used for the widgetset.
`MemSizeLessThan`	function	Determines if the specified non-zero memory size is smaller than a given value.

Types

`PEventHandler`	type	Pointer to an event handler routine.
`PPipeEventHandler`	type	Pointer to a pipe event handler routine.
`PProcessEventHandler`	type	Pointer to a process event handler routine.
`PSocketEventHandler`	type	Pointer to a socket event handler routine.
`TApplicationMainLoop`	procedure type	Represents the main processing loop in an application.
`TChildExitEvent`	procedure type	Specifies an event handler signalled when a child process is exited.
`TChildExitReason`	enumeration	Represents reasons that a child process was exited.
`TInputDialogFunction`	procedure type	Specifies the function called for a given platform to display and execute an input dialog using the specified values.
`TLCLCapability`	enumeration	Represents capabilities used in the LCL.
`TLCLWndMethod`	procedure type	The type used for all LCL message handlers.
`TLoadBitmapFunction`	procedure type	Specifies a function called to load a bitmap image from the specified file or resource and return the handle for the image.
`TLoadCursorFunction`	procedure type	Specifies a function called to load a cursor shape with the specified identifier and return the handle for the cursor image.
`TLoadIconFunction`	procedure type	Specifies a function called to load a named icon from a resource with the specified handle.
`TPipeEvent`	procedure type	Specifies an event handler signalled for a pipe handle in a widgetset object.
`TPipeReason`	enumeration	Represents reasons that a pipe event was signalled.
`TPipeReasons`	set	Set type used to store values from TPipeReason.
`TPromptDialogFunction`	procedure type	Specifies a function called to display and execute a widgetset-independent dialog using the specified settings.
`TQuestionDialogFunction`	procedure type	Specifies a function called to display and execute a widgetset-independent Question Mark dialog using the specified settings.
`TSocketEvent`	procedure type	Specifies an event handler signalled for a socket handle in a widgetset object.
`TWaitHandleEvent`	procedure type	Specifies an event handler signalled for the handle in an interface object.
`TWidgetSetClass`	type	Class reference used to create new instance of the TWidgetSet class.
`TWSTimerProc`	procedure type	Type used for a timer callback procedure.

Constants

`LCL_CAPABILITY_NO`	constant	Constant used in TWidgetSet.GetLCLCapability.
`LCL_CAPABILITY_YES`	constant	Constant used in TWidgetSet.GetLCLCapability.

Variables

`InputDialogFunction`	variable	Procedure variable with the routine called to execute a platform-independent input dialog.
`LoadBitmapFunction`	variable	Variable with the function called to load a bitmap from a specified file or resource and return its handle.
`LoadCursorFunction`	variable
`LoadIconFunction`	variable	Variable with the function called to load an icon from a specified file or resource and return its handle.
`PromptDialogFunction`	variable	Procedure variable with the routine called to execute a platform-independent prompt dialog.
`QuestionDialogFunction`	variable	Procedure variable with the routine called to execute a platform-independent dialog using the Question Mark icon.
`WidgetSet`	variable	Provides access to the widgetset class instance for the platform.

Uses

An experiment, built from Lazarus main 2dfa93c66e of 10-22-2026. Not the official Lazarus documentation.