Controls unit

Contains types, constants, classes, and routines used to implement visual controls.

controls.pp contains classes, types, constants, and routines used to implement visual controls used in the Lazarus Component Library ( LCL). Most of the classes are base classes, or used in the implementation of controls defined in others units.

The following components are added to the Common Controls tab in the Lazarus IDE component palette:

TImageList

The following components are registered but not displayed on the Lazarus IDE component palette:

TCustomControl
TGraphicControl

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

Classes and records

`ELayoutException`	class	Exception raised when a loop is detected when adjusting the size for controls.
`IObjInspInterface`	interface	Defines an interface used in the Lazarus Object Inspector.
`TAlignInfo`	record	Used in custom alignment (alCustom).
`TAnchorSide`	class	Specifies how the side of a control is anchored to other controls.
`TCMCancelMode`	record	Contains information representing a CM_CANCELMODE control message.
`TCMChanged`	record	Not used in the current LCL implementation.
`TCMChildKey`	record	Not used in the current LCL implementation.
`TCMControlChange`	record	Contains values representing a Control Change Message.
`TCMControlListChange`	record	Not used in the current LCL implementation.
`TCMMouseWheel`	record	Defines a structure used for mouse wheel control messages.
`TControl`	class	The base class for visible controls.
`TControlActionLink`	class	Links an Action to a control.
`TControlBorderSpacing`	class	Describes the (minimum) spacing around a control.
`TControlBorderSpacingDefault`	record	Defines the default values for TControlBorderSpacing.
`TControlCanvas`	class	Base class which provides a canvas property used in graphic controls.
`TControlChildSizing`	class	Provides settings to layout child-controls into a grid (table) layout.
`TControlFont`	class
`TControlPropertyStorage`	class	Implements the abstract ancestor class used to get the property list for a control.
`TCustomControl`	class	The base class for windowed controls which paint themselves.
`TDockManager`	class	The layout manager for a docksite.
`TDockTree`	class	A tree of TDockZone instances where each docked window has one tree.
`TDockZone`	class	Represents a node in a TDockTree
`TDragControlObject`	class	A drag object for dragging a control.
`TDragControlObjectEx`	class	A drag object for dragging a control.
`TDragDockObject`	class	A drag object for drag-dock.
`TDragDockObjectEx`	class	A drag object for docking that is automatically destroyed after use.
`TDragImageList`	class	A multi-resolution list of Images used during Drag operations.
`TDragImageListResolution`	class	Implements an image list resolution with features used in Drag and Drop operations.
`TDragManager`	class	The abstract base class used to manage dragging of controls (for drop or dock operations).
`TDragObject`	class	Base class for managing drag operations and user feedback.
`TDragObjectEx`	class	Extends TDragObject to automatically free itself in the DragManager.
`TGraphicControl`	class	TGraphicControl is the base class for all lightweight controls.
`THintInfo`	record	Contains content and state information for Hints displayed for a window or control.
`TImageList`	class	Implements a multi-resolution container for images used in an application.
`TImageListHelper`	helper	Helper class for TCustomImageList useful for images on TControl instances.
`TLazAccessibleObject`	class	Represents an accessibility object for user or accessibility tool interactions.
`TLazAccessibleObjectEnumerator`	class	Implements an enumerator for a list of TLazAccessibleObject instances.
`TMouse`	class	Provides access to properties of the Mouse.
`TSizeConstraints`	class	Holds minimum and maximum values for the width or height of a control.
`TWinControl`	class	Implements a windowed control which can contain other child controls.
`TWinControlEnumerator`	class	Implements an enumerator for TWinControl instances.

Procedures and functions

`AdjustBorderSpace`	procedure	Adjusts the border space around the control to the client rectangle.
`assign(Variant):TCaption`	operator	Declares an assignment operator used to convert a Variant type to a TCaption type.
`BidiFlipAlignment`	function	Gets the inverse alignment value when BiDiMode is enabled.
`BidiFlipAnchors`	function	Swaps left and right anchor side settings for the specified control when BiDiMode is enabled.
`BidiFlipRect`	function	Flips the left and right coordinates in a rectangle and makes it relative to the ParentRect when Flip is True.
`CancelDrag`	procedure	Cancels an active drag operation.
`ChangeBiDiModeAlignment`	procedure	Flips the value Alignment to reflect the value needed for BiDi mode.
`CheckMouseButtonDownUp`	function	Checks for mouse click events for the specified control.
`CheckTransparentWindow`	procedure	Checks whether the handle for a windowed control (or a parent control) is transparent.
`CompareDataObjectWithLazAccessibleObject`	function	Compares the specified pointers containing Lazarus accessibility object data and a accessibility object.
`CompareLazAccessibleObjectsByDataObject`	function	Compares the specified pointers containing a Lazarus accessibility object and a accessibility object data.
`CursorToIdent`	function	Uses a look-up table to find the cursor identifier corresponding to an Integer cursor constant.
`CursorToString`	function	Returns a string with the name for the cursor in the integer constant.
`DbgS`	function	Converts items of several data types into strings, for debug output.
`FindControl`	function	Return the TWinControl for the given Handle.
`FindControlAtPosition`	function	Gets the control at the specified screen position.
`FindDragTarget`	function	Gets the drag target at the specified screen position.
`FindLCLControl`	function	Returns the TControl currently visible at the specified screen position.
`FindLCLWindow`	function	Find the window and its owning control at the given screen coordinates.
`FindOwnerControl`	function	Returns the TWinControl for the given Handle; the parent control for a non-TWinControl Handle.
`GetCaptureControl`	function	Returns the TControl instance with mouse capture enabled.
`GetCursorValues`	procedure	Calls the specified procedure for each of the cursor identifiers.
`GetKeyShiftState`	function	Gets a set of state values for current modifier keys.
`IdentToCursor`	function	Converts an identifier name for a cursor shape to its value as an Integer.
`IsColorDefault`	function	Determines if the color for the control is the system default (GTK).
`MoveWindowOrg`	procedure	Moves the origin for a windowed control.
`RecreateWnd`	procedure	Creates (or recreates) the widgetset class instance for a TWinControl.
`Register`	procedure	Register the components provided by this unit or package, so that they can be instantiated.
`SendAppMessage`	function	Sends an application message using the specified parameter values.
`SetCaptureControl`	procedure	Set the mouse capture to the specified control, or one of its children, at the given coordinates.
`StringToCursor`	function	StringToCursor - returns the cursor value corresponding to the name supplied.

Types

`PControlBorderSpacingDefault`	type	Pointer to a TControlBorderSpacingDefault type.
`PHintInfo`	type	Pointer to a THintInfo instance.
`TAlign`	enumeration	Alignment options for a control, within its Parent control.
`TAlignInsertBeforeEvent`	procedure type	Type of an OnAlignInsertBefore handler.
`TAlignPositionEvent`	procedure type	Type of an OnAlignPosition handler.
`TAlignSet`	set	Set of alignment options.
`TAnchorKind`	enumeration	The control side to be anchored.
`TAnchors`	set	Set type used to store values from the TAnchorKind enumeration.
`TAnchorSideChangeOperation`	enumeration	Operations in
`TAnchorSideReference`	enumeration	The side of another control, to which this control's side is anchored.
`TBevelCut`	type	Alias for the TGraphicsBevelCut type.
`TBorderStyle`	type	Possible types of borders (with or without border).
`TBorderWidth`	type	Integer type used for .
`TCaption`	type	A string type used for the caption on a control.
`TCaptureMouseButtons`	set	Set type used to store TMouseButton values.
`TChildControlResizeStyle`	enumeration	Defines how child controls are resized / aligned.
`TCMDesignHitTest`	type	Alias for the TLMMouse type.
`TCMDialogChar`	type	Alias for the TLMKey type.
`TCMDialogKey`	type	Alias for the TLMKey type.
`TCMEnter`	type	Alias for the TLMEnter type.
`TCMExit`	type	Alias for the TLMExit type.
`TCMHitTest`	type	Alias for the TLMNCHitTest type.
`TConstrainedResizeEvent`	procedure type	Specifies an event handler signalled to resize a control to the specified size constraints.
`TConstraintSize`	type	Range for control size constraints.
`TContextPopupEvent`	procedure type	Handler type for OnContextPopup.
`TControlActionLinkClass`	type	Class type used to create new instances of TControlActionLink.
`TControlAtPosFlag`	enumeration	Flags for finding a control at a given (client) position.
`TControlAtPosFlags`	set	Set type used to store values from the TControlAtPosFlag enumeration.
`TControlAutoSizePhase`	enumeration	Represents AutoSizing phases for controls.
`TControlAutoSizePhases`	set	Set type used to store values from the TControlAutoSizePhase enumeration.
`TControlBorderStyle`	type	Possible types of control borders (with or without border).
`TControlCellAlign`	enumeration	Modes for aligning a control in a table cell.
`TControlCellAligns`	set	Set type used to store values from the TControlCellAlign enumeration.
`TControlChildrenLayout`	enumeration	Defines the logic used to arrange child controls.
`TControlClass`	type	TControlClass - class of TControl.
`TControlFlag`	enumeration	Flags values used mostly for pending actions in a control.
`TControlFlags`	set	Set type used to store values from the TControlFlag enumeration.
`TControlFontClass`	type
`TControlHandlerType`	enumeration	Notification handler types.
`TControlRoleForForm`	enumeration	Possible default actions on special keys.
`TControlRolesForForm`	set	Set type used to store values from the TControlRoleForForm enumeration.
`TControlShowHintEvent`	procedure type	Type used to implement an OnShowHint event handler.
`TControlState`	set	Set of control states used in a control.
`TControlStateType`	enumeration	State flags of a Control.
`TControlStyle`	set	Set type used to store values from the TControlStyleType enumeration.
`TControlStyleType`	enumeration	Enumerated type with values for features or behaviors for a control.
`TCursor`	type	Defines the range of values used for cursor shapes.
`TDockDropEvent`	procedure type	The type of an OnDockDrop handler.
`TDockManagerClass`	type	The DockManager class type, for use when a DockManager is automatically created.
`TDockOrientation`	enumeration	Orientation of DockZones and docked controls, similar to
`TDockOverEvent`	procedure type	The type of an OnDockOver handler.
`TDockTreeFlag`	enumeration	Represents flag values used in TDockTree.
`TDockTreeFlags`	set	Set type used to store values from the TDockTreeFlag enumeration.
`TDockZoneClass`	type	Class of
`TDragDropEvent`	procedure type	The type of an OnDragDrop notification handler.
`TDragKind`	enumeration	Indicates whether the control performs drag-drop or drag-dock operation.
`TDragMessage`	enumeration	Message types used in DragManager.
`TDragMode`	enumeration	Indicates whether a drag operation can start automatically.
`TDragObjectClass`	type	A class type.
`TDragOverEvent`	procedure type	The type of an OnDragOver handler.
`TDragState`	enumeration	Values representing State changes for a drag operation.
`TDrawDockImageEvent`	procedure type	Event handler used to draw the docking image in a drag and dock operation.
`TEndDragEvent`	procedure type	The type of an OnEndDrag handler.
`TForEachZoneProc`	procedure type	The type for a ForEachZone callback procedure, currently unused.
`TFormBorderStyle`	enumeration	Represents border styles available for a Form.
`TFormStyle`	enumeration	Defines special form behavior.
`TGetChildProc`	procedure type	Type used for a callback method, to be called for all children of a control.
`TGetDockCaptionEvent`	procedure type	Specifies an event handler used to get the caption for a docked control.
`TGetSiteInfoEvent`	procedure type	An OnGetSiteInfo handler returns information about a docksite.
`TKeyEvent`	procedure type	Defines an event handler for key events.
`TKeyPressEvent`	procedure type	Specifies an event handler for key press events.
`TLayoutAdjustmentPolicy`	enumeration	Indicates the policy for the LCL to execute automatic adjustments in the form layout.
`TLazAccessibilityRole`	enumeration	Indicates the role which a accessible object takes in the user interface.
`TMouseButton`	enumeration	Enumeration with values for logical mouse buttons.
`TMouseEvent`	procedure type	Specifies an event handler used to respond to mouse button events.
`TMouseMoveEvent`	procedure type	Specifies an event handler used to respond to mouse movement events.
`TMouseWheelEvent`	procedure type	Specifies an event handler used to respond to mouse wheel events.
`TMouseWheelUpDownEvent`	procedure type	Type of OnMouseWheelUp/Down event handlers.
`TSizeConstraintsOption`	enumeration	Enumerated type with options used in TSizeConstraints.
`TSizeConstraintsOptions`	set	Set type used to store values from the TSizeConstraintsOption enumeration.
`TSpacingSize`	type	Alias to the Integer type.
`TStartDockEvent`	procedure type	The type of an OnStartDock handler.
`TStartDragEvent`	procedure type	The type of an OnStartDrag handler.
`TTabOrder`	type	Range type used to represent the tab order for windowed controls.
`TUnDockEvent`	procedure type	The type used for OnUnDock event handler.
`TUTF8KeyPressEvent`	procedure type	Specifies an event handler for UTF-8-encoded key press events.
`TWinControlActionLink`	type	Alias for the TControlActionLink type.
`TWinControlActionLinkClass`	type	Class type used to create new instances of TWinControlActionLink.
`TWinControlClass`	type	TWinControlClass - class of TWinControl.
`TWinControlFlag`	enumeration	State flags of TWinControl.
`TWinControlFlags`	set	Set type used to store TWinControlFlag enumeration values.
`TWndMethod`	procedure type	Method type for WindowProc handlers.

Constants

`AnchorAlign`	constant	Array with sets of anchors used for a given alignment option.
`AnchorReferenceSide`	constant	Not used in the current LCL version.
`asrLeft`	constant	Anchor to the left side (=asrTop).
`asrRight`	constant	Anchor to the right side (=asrBottom).
`bvLowered`	constant	Alias to the bvLowered constant in the GraphType unit.
`bvNone`	constant	Alias to the bvNone constant in the GraphType unit.
`bvRaised`	constant	Alias to the bvRaised constant in the GraphType unit.
`bvSpace`	constant	Alias to the bvSpace constant in the GraphType unit.
`ClockwiseAnchor`	constant	Used in the AnchorDocking package for the Lazarus IDE.
`CM_ACTIONEXECUTE`	constant	Control message constant.
`CM_ACTIONUPDATE`	constant	Control message constant.
`CM_ACTIVATE`	constant	Control message constant.
`CM_ALLCHILDRENFLIPPED`	constant	Control message constant.
`CM_APPKEYDOWN`	constant	Control message constant.
`CM_APPSHOWBTNGLYPHCHANGED`	constant	Control message constant.
`CM_APPSHOWMENUGLYPHCHANGED`	constant	Control message constant.
`CM_APPSYSCOMMAND`	constant	Control message constant.
`CM_BASE`	constant	Starting value for control message constants defined in the LCL.
`CM_BIDIMODECHANGED`	constant	Control message constant.
`CM_BORDERCHANGED`	constant	Control message constant.
`CM_BUFFEREDPRINTCLIENT`	constant	Control message constant.
`CM_BUTTONPRESSED`	constant	Control message constant.
`CM_CANCELMODE`	constant	Control message constant.
`CM_CHANGED`	constant	Control message constant.
`CM_CHILDKEY`	constant	Control message constant.
`CM_COLORCHANGED`	constant	Control message constant.
`CM_CONTROLCHANGE`	constant	Control message constant.
`CM_CONTROLLISTCHANGE`	constant	Control message constant.
`CM_CONTROLLISTCHANGING`	constant	Control message constant.
`CM_CREATEPOPUP`	constant	Control message constant.
`CM_CTL3DCHANGED`	constant	Control message constant.
`CM_CURSORCHANGED`	constant	Control message constant.
`CM_CUSTOMGESTURESCHANGED`	constant	Control message constant.
`CM_DEACTIVATE`	constant	Control message constant.
`CM_DESIGNHITTEST`	constant	Control message constant.
`CM_DESTROYHANDLE`	constant	Control message constant.
`CM_DIALOGCHAR`	constant	Control message constant.
`CM_DIALOGHANDLE`	constant	Control message constant.
`CM_DIALOGKEY`	constant	Control message constant.
`CM_DOCKCLIENT`	constant	Control message constant.
`CM_DOCKNOTIFICATION`	constant	Control message constant.
`CM_DOCWINDOWACTIVATE`	constant	Control message constant.
`CM_DOUBLEBUFFEREDCHANGED`	constant	Control message constant.
`CM_DRAG`	constant	Control message constant.
`CM_ENABLEDCHANGED`	constant	Control message constant.
`CM_ENTER`	constant	Control message constant.
`CM_EXIT`	constant	Control message constant.
`CM_FLOAT`	constant	Control message constant.
`CM_FOCUSCHANGED`	constant	Control message constant.
`CM_FONTCHANGE`	constant	Control message constant.
`CM_FONTCHANGED`	constant	Control message constant.
`CM_GESTURE`	constant	Control message constant.
`CM_GESTUREMANAGERCHANGED`	constant	Control message constant.
`CM_GETDATALINK`	constant	Control message constant.
`CM_GOTFOCUS`	constant	Control message constant.
`CM_HINTSHOW`	constant	Control message constant.
`CM_HINTSHOWPAUSE`	constant	Control message constant.
`CM_HITTEST`	constant	Control message constant.
`CM_ICONCHANGED`	constant	Control message constant.
`CM_INPUTLANGCHANGE`	constant	Control message constant.
`CM_INVALIDATE`	constant	Control message constant.
`CM_INVALIDATEDOCKHOST`	constant	Control message constant.
`CM_INVOKEHELP`	constant	Control message constant.
`CM_ISSHORTCUT`	constant	Control message constant.
`CM_ISTOOLCONTROL`	constant	Control message constant.
`CM_LCLOFFSET`	constant	Control message constant.
`CM_LOSTFOCUS`	constant	Control message constant.
`CM_MASKHITTEST`	constant	Control message constant implement by controls with an irregular shape to check if a point belongs to a shape.
`CM_MENUCHANGED`	constant	Control message constant.
`CM_MOUSEACTIVATE`	constant	Control message constant.
`CM_MOUSEENTER`	constant	Control message constant.
`CM_MOUSELEAVE`	constant	Control message constant.
`CM_MOUSEWHEEL`	constant	Control message constant.
`CM_PARENTBIDIMODECHANGED`	constant	Control message constant.
`CM_PARENTCOLORCHANGED`	constant	Control message constant.
`CM_PARENTCTL3DCHANGED`	constant	Control message constant.
`CM_PARENTDOUBLEBUFFEREDCHANGED`	constant	Control message constant.
`CM_PARENTFONTCHANGED`	constant	Control message constant.
`CM_PARENTSHOWHINTCHANGED`	constant	Control message constant.
`CM_PARENTTABLETOPTIONSCHANGED`	constant	Control message constant.
`CM_POPUPHWNDDESTROY`	constant	Control message constant.
`CM_RECREATEWND`	constant	Control message constant.
`CM_RELEASE`	constant	Control message constant.
`CM_SETACTIVECONTROL`	constant	Control message constant.
`CM_SHOWHINTCHANGED`	constant	Control message constant.
`CM_SHOWINGCHANGED`	constant	Control message constant.
`CM_STANDARDGESTURESCHANGED`	constant	Control message constant.
`CM_SYSCOLORCHANGE`	constant	Control message constant.
`CM_SYSFONTCHANGED`	constant	Control message constant.
`CM_TABLETOPTIONSCHANGED`	constant	Control message constant.
`CM_TABSTOPCHANGED`	constant	Control message constant.
`CM_TEXTCHANGED`	constant	Control message constant.
`CM_THEMECHANGED`	constant	Control message constant.
`CM_TIMECHANGE`	constant	Control message constant.
`CM_UIACTIVATE`	constant	Control message constant.
`CM_UIDEACTIVATE`	constant	Control message constant.
`CM_UNDOCKCLIENT`	constant	Control message constant.
`CM_UNTHEMECONTROL`	constant	Control message constant.
`CM_UPDATEACTIONS`	constant	Control message constant.
`CM_VISIBLECHANGED`	constant	Control message constant.
`CM_WANTSPECIALKEY`	constant	Control message constant.
`CM_WINDOWHOOK`	constant	Control message constant.
`CM_WININICHANGE`	constant	Control message constant.
`CN_BASE`	constant	Starting value for control notification messages in the LCL.
`CN_CHAR`	constant	Control notification message constant.
`CN_CHARTOITEM`	constant	Control notification message constant.
`CN_COMMAND`	constant	Control notification message constant.
`CN_COMPAREITEM`	constant	Control notification message constant.
`CN_CTLCOLORBTN`	constant	Control notification message constant.
`CN_CTLCOLORDLG`	constant	Control notification message constant.
`CN_CTLCOLOREDIT`	constant	Control notification message constant.
`CN_CTLCOLORLISTBOX`	constant	Control notification message constant.
`CN_CTLCOLORMSGBOX`	constant	Control notification message constant.
`CN_CTLCOLORSCROLLBAR`	constant	Control notification message constant.
`CN_CTLCOLORSTATIC`	constant	Control notification message constant.
`CN_DELETEITEM`	constant	Control notification message constant.
`CN_DRAWITEM`	constant	Control notification message constant.
`CN_HSCROLL`	constant	Control notification message constant.
`CN_KEYDOWN`	constant	Control notification message constant.
`CN_KEYUP`	constant	Control notification message constant.
`CN_MEASUREITEM`	constant	Control notification message constant.
`CN_NOTIFY`	constant	Control notification message constant.
`CN_PARENTNOTIFY`	constant	Control notification message constant.
`CN_SYSCHAR`	constant	Control notification message constant.
`CN_SYSKEYDOWN`	constant	Control notification message constant.
`CN_SYSKEYUP`	constant	Control notification message constant.
`CN_VKEYTOITEM`	constant	Control notification message constant.
`CN_VSCROLL`	constant	Control notification message constant.
`crAppStart`	constant	Application starting cursor.
`crArrow`	constant	The Arrow cursor, which is the most common and the default one in most cases.
`crCross`	constant	A cursor utilized for graphics, for pixel or rectangle selection, often in the shape of a cross.
`crDefault`	constant	Indicates that the default cursor from the system should be utilized.
`crDrag`	constant	A cursor to indicate that one can drop a dragged item in this area.
`crHandPoint`	constant	Pointing hand cursor constant (-21).
`crHelp`	constant	"What's This" Help cursor constant (-20).
`crHigh`	constant	Highest defined cursor constant (0).
`crHourGlass`	constant	Busy cursor constant, utilized to indicate that one should wait while an action is done.
`crHSplit`	constant	Horizontal Splitter cursor constant (-14).
`crIBeam`	constant	A text cursor, for setting insertion point. Often used in text editors.
`crLow`	constant	Lowest defined cursor constant (-30).
`crMultiDrag`	constant	Multiple Object dragging cursor constant (-16).
`crNo`	constant	Shows a negative sign. See also .
`crNoDrop`	constant	A cursor to indicate that one cannot drop a dragged item in this area.
`crNone`	constant	Indicates that the cursor should be invisible.
`crSize`	constant	A generic sizing cursor, to indicate that here one may drag to resize something. Is the same as crSizeAll.
`crSizeAll`	constant	All Directions sizing cursor constant (-22).
`crSizeE`	constant	A cursor for resizing which has an arrow pointing to the right, to indicate resizing possibility in this direction.
`crSizeN`	constant	A cursor for resizing which has an arrow pointing upwards, to indicate resizing possibility in this direction.
`crSizeNE`	constant	A cursor for resizing which has an arrow pointing to the right-top corner, to indicate resizing possibility in this direction.
`crSizeNESW`	constant	A cursor for resizing which runs diagonally from NorthEast to SouthWest (-6).
`crSizeNS`	constant	A cursor for resizing which cursor runs from North to South (-7).
`crSizeNW`	constant	A cursor for resizing which has an arrow pointing to the left-top corner, to indicate resizing possibility in this direction.
`crSizeNWSE`	constant	A cursor for resizing which cursor runs from NorthWest to SouthEast.
`crSizeS`	constant	A cursor for resizing which has an arrow pointing downwards, to indicate resizing possibility in this direction.
`crSizeSE`	constant	A cursor for resizing which has an arrow pointing to the right-bottom corner, to indicate resizing possibility in this direction.
`crSizeSW`	constant	A cursor for resizing which has an arrow pointing to the left-bottom corner, to indicate resizing possibility in this direction.
`crSizeW`	constant	A cursor for resizing which has an arrow pointing to the left, to indicate resizing possibility in this direction.
`crSizeWE`	constant	A cursor for resizing which has an arrow with two points, one to the left and another to the right, to indicate resizing possibility in both directions.
`crSQLWait`	constant	Waiting for SQL cursor constant (-17).
`crUpArrow`	constant	Up Arrow cursor constant (-10).
`crVSplit`	constant	Vertical Split cursor constant (-15).
`csMultiClicks`	constant	Set of style values which require/provide multiple clicks on a control.
`DefaultSideForAnchorKind`	constant	Provides adjacent edges where controls are aligned for a given anchor kind.
`fsAllNonSystemStayOnTop`	constant	Set of form styles except those which make a form stay on top of all other forms of the system.
`fsAllStayOnTop`	constant	Set of form styles which make a form stay on top.
`fsBorder`	constant	Alias to the fsBorder constant in the GraphType unit.
`fsSurface`	constant	Alias to the fsSurface constant in the GraphType unit.
`GUID_ObjInspInterface`	constant	GUID for the Object Inspector in the Lazarus IDE.
`MainAlignAnchor`	constant	Used in the AnchorDocking package for the Lazarus IDE.
`mrAbort`	constant	Modal dialog aborted.
`mrAll`	constant	Modal dialog exited with the All button.
`mrCancel`	constant	Modal dialog exited with the Cancel button.
`mrClose`	constant	Modal dialog exited with the Close button.
`mrIgnore`	constant	Modal dialog exited with the Ignore button.
`mrLast`	constant	Last (highest) value of modal results.
`mrNo`	constant	Modal dialog exited with the No button.
`mrNone`	constant	Modal dialog exited with the None button.
`mrNoToAll`	constant	Modal dialog exited with the NoToAll button.
`mrOK`	constant	Modal dialog exited with the OK button.
`mrRetry`	constant	Modal dialog exited with the Retry button.
`mrYes`	constant	Modal dialog exited with the Yes button.
`mrYesToAll`	constant	Modal dialog exited with the YesToAll button.
`OppositeAnchor`	constant	Used in the AnchorDocking package for the Lazarus IDE.
`ssModifier`	constant	Defines the key used for shortcuts on different platforms.

Variables

`DefaultDockManagerClass`	variable	The default class used to create a DockManager in .
`DockSplitterClass`	variable	Class type used to create new splitter class instances.
`DragManager`	variable	The current DragManager (always TDragManagerDefault).
`Mouse`	variable	The global TMouse instance for the unit.
`NewStyleControls`	variable	Used in SynEdit.
`OnDrawDockImage`	variable	Routine used to draw dock images in drag/dock operations

Topics

`AnchoringControls`	topic	How multiple controls can be aligned and resized together, at run-time.
`AutoSize`	topic	AutoSize - boolean property that permits the size of a control to be adjusted automatically.
`ControlCoordinates`	topic	The coordinates of a control can be specified or retrieved in various ways

Uses

An experiment, built from development snapshots. Not the official Free Pascal or Lazarus documentation.