-TAnchors is the the type used to implement the Anchors property in TControl -and descendent classes. +TAnchors is the type used to implement the Anchors property in TControl and +descendent classes.
-Called when a TDragPerformer repositions the the mouse pointer during an -active drag operation. +Called when a TDragPerformer repositions the mouse pointer during an active +drag operation.
+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). +
++Change causes the AdjustSize method to be called in the associated Control. +It signals the OnChange event handler (when assigned) using the +TSizeConstraints instance as the Sender argument in the notification. +
++Change is called when a new value is assigned to the MaxWidth, MinWidth, +MaxHeight, or MinHeight properties. It is called when AssignTo is used to store +property values from the class instance to another persistent object. It is +also called when the AutoAdjustLayout is used to scale values in MaxWidth, +MinWidth, MaxHeight, or MinHeight properties by a specified size factor. +
++AssignTo is an overridden method in TSizeConstraints used +to implement object persistence. It ensures that properties specific to +TSizeConstraints are stored to the persistent object in the Dest +parameter, and includes the MaxHeight, MaxWidth, MinHeight, and MinWidth +properties. The Change method is called to adjust the size for the associated +Control, and to signal the OnChange event handler when assigned. +
++No actions are performed in the method if the properties in the class instance +have the same values as their counterparts in the Dest argument. +
++If Dest is not derived from TSizeConstraints, the inherited AssignTo method is +called. +
++Create is the constructor for the class instance, and calls the +inherited constructor on entry. Create sets the default values for properties +including: +
++It also sets the value in the Control property to the associated control +specified in the AControl argument. +
++Create calls the UpdateInterfaceConstraints method to ensure that size +constraints from the Control are applied to the widgetset class instance when +Control is a TWinControl instance and its handle has been allocated. +
++No actions are performed in the method if Control is not derived from +TWinControl, or its handle has not been allocated. UpdateInterfaceConstraints +is called from the Create constructor after setting default property values, +and assigning the associated Control for the class instance. +
+
@@ -5402,75 +5532,95 @@ Should only be used by custom components, not by applications.
+AutoAdjustLayout ensures that assigned (non-zero) values in +MinHeight, MaxHeight, MinWidth, and MaxWidth are scaled by the corresponding +scaling factor. If any of the property values are scaled, the Change method is +called to notify the associated Control that it should adjust it size. The +OnChange event is signalled (when assigned). +
++AutoAdjustLayout is called from the DoAutoAdjustLayout method in Control, and +occurs after values in BorderSpacing have been scaled. It occurs before the new +height and width for the Control are calculated and applied to its BaseBounds. +
++Control contains the value passed as an argument to the Create +constructor. It represents the control which is notified and updated when +values in the MaxHeight, MaxWidth, MinHeight, or MinWidth properties are +changed. Control is used in the Change method to apply the new size +constraints. It also allows access to properties in both the control and its +widget instance - like the handle and component state. +
++Options is a TSizeConstraintsOptions property which +contains zero (0) or more values from the TSizeConstraintsOption +enumeration. The default value for the property is an empty set ([]). +Values in Options are not used in the current LCL implementation. +
++OnChange is a TNotifyEvent property with the even handler +signalled when one of the values in MaxHeight, MaxWidth, MinHeight, or MinWidth +has been changed. OnChange is signalled (when assigned) from the Change method +using the current class instance as the Sender for the notification. OnChange +occurs after the modified constraints have been applied to the associated +Control and its size has been adjusted. +
++MaxHeight is a TConstraintSize property which contains +the maximum height in pixels allowed for the associated Control. The default +value for the property is 0 (zero) and indicates that the size constraint has +not been assigned and is not enforced. +
++Changing the value for the property causes assigned (non-zero) values in +MaxHeight and MinHeight to be normalized; the smaller of the two values becomes +the MinHeight, and the larger of the two values becomes the MaxHeight. The +Change method is called to apply the new size constraints to Control, and to +signal the OnChange event handler (when assigned). +
++Use MinHeight to set minimum height for the associated Control. +
++Use MaxWidth and MinWidth to set the constrained width for the associated +Control. +
++MaxWidth is a TConstraintSize property which contains +the maximum width in pixels allowed for the associated Control. The default +value for the property is 0 (zero) and indicates that the size constraint has +not been assigned and is not enforced. +
++Changing the value for the property causes assigned (non-zero) values in +MaxWidth and MinWidth to be normalized; the smaller of the two values becomes +the MinWidth, and the larger of the two values becomes the MaxWidth. The +Change method is called to apply the new size constraints to Control, and to +signal the OnChange event handler (when assigned). +
++Use MinWidth to set minimum width for the associated Control. +
++Use MaxHeight and MinHeight to set the constrained height for the associated +Control. +
++MinHeight is a TConstraintSize property which contains +the minimum height in pixels allowed for the associated Control. The default +value for the property is 0 (zero) and indicates that the size constraint has +not been assigned and is not enforced. +
++Changing the value for the property causes assigned (non-zero) values in +MaxHeight and MinHeight to be normalized; the smaller of the two values becomes +the MinHeight, and the larger of the two values becomes the MaxHeight. The +Change method is called to apply the new size constraints to Control, and to +signal the OnChange event handler (when assigned). +
++Use MaxHeight to set minimum height for the associated Control. +
++Use MaxWidth and MinWidth to set the constrained width for the associated +Control. +
++MixWidth is a TConstraintSize property which contains +the minimum width in pixels allowed for the associated Control. The default +value for the property is 0 (zero) and indicates that the size constraint has +not been assigned and is not enforced. +
++Changing the value for the property causes assigned (non-zero) values in +MaxWidth and MinWidth to be normalized; the smaller of the two values becomes +the MinWidth, and the larger of the two values becomes the MaxWidth. The +Change method is called to apply the new size constraints to Control, and to +signal the OnChange event handler (when assigned). +
++Use MaxWidth to set maximum width for the associated Control. +
++Use MaxHeight and MinHeight to set the constrained height for the associated +Control. +
+-For dmFindTarget, the result is a reference to the the target control. For +For dmFindTarget, the result is a reference to the target control. For dmDragDropm the result is zero (0). For other drag messages, the result indicates acceptance of the drop message.
@@ -11588,7 +11936,7 @@ in the LCL translation facilities.-See EnabledChanged for the actions performed after the value in Enabled is +See EnabledChanged for the actions performed after the value in Enabled is updated.
@@ -16279,7 +16627,7 @@ conditions are satisfied.-ShowHelp is called from methods in the the TApplication instance. It occurs +ShowHelp is called from methods in the TApplication instance. It occurs when the F1 key is pressed when the control has focus, or when its ShowHelpForObject method is called for a specific control instance.
@@ -23799,7 +24147,7 @@ event like: Ctrl, Shift, Alt, or Meta.@@ -23984,7 +24332,7 @@ instance. Setting the property to 0 (zero) causes the handle to be destroyed. 0 is the unassigned handle value.
-ParentWindow is used in the the CreateWnd method to form an association +ParentWindow is used in the CreateWnd method to form an association between the Handle in the widgetset class instance and the window handle for a control.