TSizeConstraints class

In unit Controls

Holds minimum and maximum values for the width or height of a control.

Declaration

pascal

TSizeConstraints = class(TPersistent)

Inheritance

TSizeConstraints
TPersistent
TObject

Description

TSizeConstraints is a TPersistent descendant which contains size constraints used to control the minimum or maximum width or height for an associated control. TSizeConstraints is the type used to implement the Constraints property in TControl and descendent classes.

The initial values for properties are retrieved from the widgetset class instance for the Control when its handle has been allocated. Values in TSizeConstraints properties are used when the Control is resized or its layout is adjusted, and prevent the control from being resized to Width or Height values that are in excess of the specified minimum or maximum values. If properties are modified in TSizeConstraints, the associated control is updated to apply the new size constraints (when needed).

Properties

`MaxInterfaceHeight`	public	The maximum height allowed by the widget.
`MaxInterfaceWidth`	public	The maximum width allowed by the widget.
`MinInterfaceHeight`	public	The minimum height allowed by the widget.
`MinInterfaceWidth`	public	The minimum width allowed by the widget.
`Control`	public	The associated Control to which these constraints apply.
`Options`	public	Options used to determine the size constraints.
`MaxHeight`	published	The maximum height for the associated Control.
`MaxWidth`	published	The maximum width for the associated Control.
`MinHeight`	published	The minimum height for the associated Control.
`MinWidth`	published	The minimum width for the associated Control.

Methods

`Change`	protected	Adjusts the size for the associated Control, and signals the OnChange handler when assigned.
`AssignTo`	protected	Copies property values to the specified persistent object.
`SetMaxHeight`	protected	Sets the value for the MaxHeight property.
`SetMaxWidth`	protected	Sets the value for the MaxWidth property.
`SetMinHeight`	protected	Sets the value for the MinHeight property.
`SetMinWidth`	protected	Sets the value for the MinWidth property.
`Create`	public	Constructor for the class instance.
`UpdateInterfaceConstraints`	public	Applies size constraints from the specified Control to the widgetset class instance.
`SetInterfaceConstraints`	public	Used by the LCL interface to set the widgetset constraints in the class instance.
`EffectiveMinWidth`	public	Determines the minimum applicable width given the local and interface constraints.
`EffectiveMinHeight`	public	Determines the minimum applicable height given the local and interface constraints.
`EffectiveMaxWidth`	public	Determines the maximum applicable width given the local and interface constraints.
`EffectiveMaxHeight`	public	Determines the maximum applicable height given the local and interface constraints.
`MinMaxWidth`	public	Determines the constrained Width and transfers it to the widget.
`MinMaxHeight`	public	Determines the constrained Height and transfers it to the widget.
`AutoAdjustLayout`	public	Adjusts width and height values in the class using the specified scaling factors.

Events

OnChange published Event handler signalled when a value in the class instance has been changed.

Inherited

From TPersistent (8)

Assign DefineProperties Destroy FPOAttachObserver FPODetachObserver FPONotifyObservers GetNamePath GetOwner

From TObject (40)

AfterConstruction BeforeDestruction CheckDisposed ClassInfo ClassName ClassNameIs ClassParent ClassType CleanupInstance DefaultHandler DefaultHandlerStr Dispatch DispatchStr Disposed DisposeOf Equals FieldAddress Free FreeInstance GetDisposed GetHashCode GetInterface GetInterfaceByStr GetInterfaceEntry GetInterfaceEntryByStr GetInterfaceTable GetInterfaceWeak GetLastCastErrorInfo InheritsFrom InitInstance InstanceSize MethodAddress MethodName newinstance QualifiedClassName SafeCallException StringMessageTable SystemHasExtendedRTTI ToString UnitName

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