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TDBRadioGroup class

In unit DBCtrls

TDBRadioGroup is a data-aware version of TRadioGroup, providing a series of mutually exclusive buttons to select an entry to insert into a database field.

Declaration

pascal
TDBRadioGroup = class(TCustomRadioGroup)

Inheritance

  1. TDBRadioGroup
  2. TCustomRadioGroup
  3. TCustomGroupBox
  4. TWinControl
  5. TControl
  6. TLCLComponent
  7. TComponent
  8. TPersistent
  9. TObject

Description

The properties of TDBRadioGroup are similar to those of TRadioGroup (and TCustomRadioGroup). Access is obtained to members of the group by selecting (in the Object Inspector) the ellipsis (...) next to the entry Items, and then editing the stringlist.

At run-time, selecting one of the radio buttons makes the corresponding ItemIndex available to the programmer, and the corresponding string Item gets selected and appears as the string value for the record in that field.

See also

Properties

DataLinkprotectedProvides access to properties, methods, and events for the data-aware control.
FieldpublicThe DataSet Field relevant to the data being selected.
ItemIndexpublicOrdinal position for the selected radio button in the group.
ValuepublicThe value for the selected radio button in the control.
AlignpublishedSpecifies the placement of the control on its Parent control.
AnchorspublishedThe set of anchor definitions for this control.
AutoFillpublishedIndicates if radio buttons are resized to fill the available space in the control.
AutoSizepublishedAllows automatic adjustment of the size for the control, according to its content.
BiDiModepublishedIndicates whether text controls use in bi-directional reading.
BorderSpacingpublishedDetermines the inner and outer border spacing for this control.
CaptionpublishedText displayed as the caption for the control.
ChildSizingpublishedProvides a grid (table) layout for the children of this control.
ColorpublishedThe background color for the control.
ColumnLayoutpublishedFill direction for columns on the grouped control.
ColumnspublishedNumber of columns displayed for the radio buttons on the control.
ConstraintspublishedContains the minimum and maximum Width and Height for the control.
DataFieldpublishedName of the Field in the linked dataset where the control Value is stored.
DataSourcepublishedProvides access to the linked dataset and the field definition used in the control.
DoubleBufferedpublishedWhen enabled, it reduces flicker when the control is painted.
DragCursorpublishedThe cursor shape shown during a drag operation.
DragModepublishedDetermines how a drag operation is started for the control.
EnabledpublishedDetermines whether the control responds to mouse or keyboard input.
FontpublishedThe font to be used for text display in this control.
ItemspublishedContains the string values used as captions for radio buttons in the grouped data-aware control.
ParentBiDiModepublishedIndicates whether the BiDiMode settings in the Parent control are used.
ParentColorpublishedUse the Color from the Parent control, when enabled.
ParentDoubleBufferedpublishedValue for the DoubleBuffered property in a Parent control.
ParentFontpublishedIndicates if the Font from the Parent control is used in the control.
ParentShowHintpublishedIf True, the value of ShowHint for the control will be the same as the one from the Parent. Default is True.
PopupMenupublishedA context-sensitive menu that pops up when the right mouse button is clicked over this control.
ReadOnlypublishedReadOnly - if True, data can only be read, not written or modified. (Doesn't really make sense for a RadioGroup!).
ShowHintpublishedEnables Hint display for the control.
TabOrderpublishedIndicates the navigation order for the control when the user presses the Tab or Shift+Tab key.
TabStoppublishedAllows the user to navigate to / from the control by pressing the Tab or Shift+Tab keys.
ValuespublishedThe values of the strings in Items.
VisiblepublishedIndicates if the control is visible on its parent.

Methods

ChangeprotectedSignals the OnChange event handler when assigned.
NotificationprotectedSets the DataSource to Nil when the control is destroyed.
DataChangeprotectedUpdates the control display value when the linked dataset is repositioned.
UpdateDataprotectedUpdates the linked dataset using the current selection in the control.
GetButtonValueprotectedGets the value for the radio button at the specified position in the control.
UpdateRadioButtonStatesprotectedUpdates the linked dataset to reflect the current radio button selected in the control.
CreatepublicConstructor for the class instance.
DestroypublicDestroy is the destructor for the class instance.
EditingDonepublicPerforms actions needed when the user has finished editing.
ExecuteActionpublicImplements support for standard actions in the control.
UpdateActionpublicUpdates the specified action to reflect the current state in the linked dataset.

Events

OnChangepublishedEvent Handler signalled when the Value for the control is changed.
OnChangeBoundspublishedEvent handler signalled when the Bounds for the control have been changed.
OnClickpublishedNotification handler for mouse clicks.
OnContextPopuppublishedInvoked when a context-sensitive pop-up menu is requested.
OnDragDroppublishedEvent handler signalled when an object is dropped onto the control.
OnDragOverpublishedEvent handler signalled when a control is dragged over the control instance.
OnEndDragpublishedEvent handler signalled for the end of a drag-drop operation.
OnMouseDownpublishedEvent handler signalled when a mouse down event is handled for the control.
OnMouseEnterpublishedEvent handler signalled when the mouse pointer has entered the control.
OnMouseLeavepublishedEvent handler signalled when the mouse pointer has left the control.
OnMouseMovepublishedEvent handler signalled when the mouse pointer is moved in the control.
OnMouseUppublishedEvent handler signalled when a mouse up event is handled for the control.
OnMouseWheelpublishedEvent handler for mouse wheel turned.
OnMouseWheelDownpublishedEvent handler signalled for a downward movement of the mouse wheel.
OnMouseWheelUppublishedEvent handler signalled for an upward movement of the mouse wheel.
OnResizepublishedNotification handler for a resize of the control.
OnStartDragpublishedEvent handler signalled for the start of a dragging operation.

Inherited

From TCustomRadioGroup (17)

Buttons CanModify CheckItemIndexChanged FlipChildren GetItemIndex InitializeWnd OnItemEnter OnItemExit OnSelectionChanged ReadState Rows SetColumns SetItemIndex SetItems UpdateAll UpdateInternalObjectList WSRegisterClass

From TCustomGroupBox (7)

CMParentColorChanged CreateParams GetControlClassDefaultSize ParentBackground SetColor SetParentBackground UpdateOpaque

From TWinControl (234)

AddControl AdjustClientRect AlignControls AllAutoSized AutoAdjustLayout AutoSizeDelayed AutoSizeDelayedHandle AutoSizeDelayedReport AutoSizePhases BeginUpdateBounds BorderStyle BorderWidth BoundsLockCount BroadCast Brush BrushCreated CachedClientHeight CachedClientWidth CalculatePreferredSize CanFocus CanSetFocus CanTab ChangeScale ChildClassAllowed ChildHandlesCreated ChildKey ClientRectNeedsInterfaceUpdate CMBiDiModeChanged CMBorderChanged CMDoubleBufferedChanged CMEnabledChanged CMEnter CMExit CMParentDoubleBufferedChanged CMShowHintChanged CMShowingChanged CMVisibleChanged CNChar CNKeyDown CNKeyUp CNSysKeyDown CNSysKeyUp ContainsControl ControlAtPos ControlCount ControlKeyDown ControlKeyUp Controls ControlsAligned CreateBrush CreateDockManager CreateHandle CreateParented CreateParentedControl CreateSubClass CreateWnd CustomAlignInsertBefore CustomAlignPosition DefaultHandler DefWndProc DesignerDeleting DestroyHandle DestroyWnd DialogChar DisableAlign DoAddDockClient DoAdjustClientRectChange DoAlignChildControls DoAllAutoSize DoAutoSize DoChildSizingChange DockClientCount DockClients DockDrop DockManager DockOver DockSite DoConstraintsChange DoDockClientMsg DoDockOver DoDragMsg DoEnter DoExit DoFlipChildren DoFloatMsg DoGetDockCaption DoKeyDownBeforeInterface DoKeyPress DoKeyUpBeforeInterface DoRemainingKeyDown DoRemainingKeyUp DoRemoveDockClient DoSendBoundsToInterface DoSendShowHideToInterface DoSetBounds DoUnDock DoUndockClientMsg DoUTF8KeyPress EnableAlign EndUpdateBounds EraseBackground FinalizeWnd FindChildControl FindNextControl FixDesignFontsPPIWithChildren FixupTabList Focused FontChanged FormEndUpdated GetAdjustedLogicalClientRect GetBorderStyle GetChildren GetChildrenRect GetClientOrigin GetClientRect GetControlIndex GetControlOrigin GetDeviceContext GetDockCaption GetEnumeratorControls GetEnumeratorControlsReverse GetMouseCapture GetParentHandle GetPreferredSizeClientFrame GetSiteInfo GetTabOrderList GetTextLen GetTopParentHandle Handle HandleAllocated HandleNeeded InsertControl IntfGetDropFilesTarget IntfUTF8KeyPress Invalidate InvalidateBoundsRealized InvalidateClientRectCache InvalidatePreferredChildSizes IsClientHeightStored IsClientWidthStored IsControlMouseMsg IsFlipped IsResizing IsSpecialSubControl KeyDown KeyDownAfterInterface KeyDownBeforeInterface KeyPress KeyUp KeyUpAfterInterface KeyUpBeforeInterface Loaded LockRealizeBounds MainWndProc NotifyControls OnAlignInsertBefore OnAlignPosition OnDockDrop OnDockOver OnEnter OnExit OnGetDockCaption OnGetSiteInfo OnKeyDown OnKeyPress OnKeyUp OnUnDock OnUTF8KeyPress PaintControls PaintHandler PaintTo PaintWindow ParentFormHandleInitialized ParentHandlesAllocated ParentWindow PerformTab RealGetText ReAlign RealizeBounds RealizeBoundsRecursive RealSetText ReloadDockedControl RemoveControl RemoveFocus Repaint ScaleBy ScaleControls ScrollBy ScrollBy_WS SelectFirst SelectNext SendDialogChar SendMoveSizeMessages SetBorderStyle SetBounds SetChildZPosition SetControlIndex SetDockManager SetFocus SetShape SetTempCursor ShowControl Showing UnlockRealizeBounds Update UpdateControlState UpdateDockCaption UpdateShowing UseDockManager UTF8KeyPress VisibleDockClientCount WindowHandle WMChar WMContextMenu WMDestroy WMEnter WMEraseBkgnd WMExit WMKeyDown WMKeyUp WMKillFocus WMMove WMNotify WMPaint WMSetFocus WMShowWindow WMSize WMSysChar WMSysKeyDown WMSysKeyUp WMWindowPosChanged WndProc WriteLayoutDebugReport WSSetText

From TControl (325)

AccessibleDescription AccessibleName AccessibleRole AccessibleValue Action ActionChange ActionLink ActiveDefaultControlChanged AddHandler AddHandlerOnBeforeDestruction AddHandlerOnChangeBounds AddHandlerOnEnabledChanged AddHandlerOnEnabledChanging AddHandlerOnKeyDown AddHandlerOnMouseWheel AddHandlerOnResize AddHandlerOnVisibleChanged AddHandlerOnVisibleChanging AdjustSize AnchorAsAlign AnchorClient AnchoredControlCount AnchoredControls AnchorHorizontalCenterTo AnchorParallel AnchorSame AnchorSide AnchorSideBottom AnchorSideChanged AnchorSideLeft AnchorSideRight AnchorSideTop AnchorToCompanion AnchorToNeighbour AnchorVerticalCenterTo AssignTo AutoSizing AutoSizingAll AutoSizingLockCount BaseBounds BaseParentClientSize BeforeDestruction BeforeDragStart BeginAutoDrag BeginAutoSizing BeginDrag BoundsChanged BoundsRect BoundsRectForNewParent BringToFront CalculateDockSizes CanAutoSize CaptureChanged CaptureMouseButtons ChangeBounds Changed CheckChildClassAllowed CheckNewParent CheckOnChangeBounds Click ClientHeight ClientOrigin ClientRect ClientToParent ClientToScreen ClientWidth CMChanged CMCursorChanged CMHintShow CMHitTest CMMouseEnter CMMouseLeave CMParentBiDiModeChanged CMParentFontChanged CMParentShowHintChanged CMSysFontChanged CMTextChanged CNPreferredSizeChanged ColorIsStored ConstrainedResize ControlFontClass ControlOrigin ControlState ControlStyle ControlToScreen CreateAccessibleObject CreateControlBorderSpacing CreateFloatingDockSite Cursor DblClick DefineProperties DesktopFont DisableAutoSizing DoAutoAdjustLayout DoBorderSpacingChange DoCallKeyEventHandler DoCallMouseWheelEventHandler DoCallNotifyHandler Dock Docked DockOrientation DockTrackNoTarget DoContextPopup DoDock DoEndDock DoEndDrag DoFixDesignFontPPI DoMouseDown DoMouseUp DoMouseWheel DoMouseWheelDown DoMouseWheelHorz DoMouseWheelLeft DoMouseWheelRight DoMouseWheelUp DoOnChangeBounds DoOnParentHandleDestruction DoOnResize DoOnShowHint DoScaleFontPPI DoStartDock DoStartDrag DragCanceled DragDrop Dragging DragKind DragOver EnableAutoSizing EnabledChanged EnabledChanging EndAutoSizing EndDrag ExecuteCancelAction ExecuteDefaultAction FindSubComponent FixDesignFontsPPI Floating FloatingDockSiteClass ForeignAnchorSideChanged FormIsUpdating GetAccessibleObject GetAction GetActionLinkClass GetAnchorsDependingOnParent GetCachedText GetCanvasScaleFactor GetChildAccessibleObjectAtPos GetClientScrollOffset GetColorResolvingParent GetCursor GetDefaultColor GetDefaultDockCaption GetDefaultHeight GetDefaultWidth GetDockEdge GetDragImages GetEnabled GetFloating GetFloatingDockSiteClass GetLogicalClientRect GetMousePosFromMessage GetPalette GetParentBackground GetParentComponent GetPopupMenu GetPreferredSize GetRGBColorResolvingParent GetScrolledClientRect GetSelectedChildAccessibleObject GetSidePosition GetTextBuf GetTopParent HandleObjectShouldBeVisible HasHelp HasParent Height HeightIsAnchored HelpContext HelpKeyword HelpType Hide Hint HostDockSite InitiateAction InvalidateControl InvalidatePreferredSize IsAParentAligning IsBorderSpacingInnerBorderStored IsCaptionStored IsControl IsControlVisible IsEnabled IsParentColor IsParentFont IsParentOf IsProcessingPaintMsg IsRightToLeft IsVisible Left LMCaptureChanged LoadedAll LRDockWidth ManualDock ManualFloat MouseCapture MouseDown MouseEnter MouseInClient MouseLeave MouseMove MouseUp OnConstrainedResize OnDblClick OnEditingDone OnEndDock OnMouseWheelHorz OnMouseWheelLeft OnMouseWheelRight OnQuadClick OnShowHint OnStartDock OnTripleClick Parent ParentDestroyingHandle ParentFontChanged ParentToClient Perform PositionDockRect QuadClick ReadBounds Refresh RemoveAllHandlersOfObject RemoveHandler RemoveHandlerOnBeforeDestruction RemoveHandlerOnChangeBounds RemoveHandlerOnEnabledChanged RemoveHandlerOnEnabledChanging RemoveHandlerOnKeyDown RemoveHandlerOnMouseWheel RemoveHandlerOnResize RemoveHandlerOnVisibleChanged RemoveHandlerOnVisibleChanging ReplaceDockedControl RequestAlign Resize Scale96ToFont Scale96ToForm Scale96ToScreen ScaleConstraints ScaleDesignToForm ScaleFontsPPI ScaleFontTo96 ScaleFontToScreen ScaleFormTo96 ScaleFormToDesign ScaleScreenTo96 ScaleScreenToFont ScreenToClient ScreenToControl SendToBack SessionProperties SetAction SetAlign SetAnchors SetAutoSize SetBiDiMode SetBoundsKeepBase SetCursor SetDragMode SetEnabled SetHint SetInitialBounds SetName SetParent SetParentBiDiMode SetParentComponent SetTextBuf SetVisible SetZOrder ShouldAutoAdjust Show ShowHelp TBDockHeight Text TextChanged Top TripleClick UndockHeight UndockWidth UpdateAnchorRules UpdateBaseBounds UpdateMouseCursor UpdateRolesForForm UseRightToLeftAlignment UseRightToLeftReading UseRightToLeftScrollBar VisibleChanged VisibleChanging Width WidthIsAnchored WindowProc WMCancelMode WMLButtonDBLCLK WMLButtonDown WMLButtonQuadCLK WMLButtonTripleCLK WMLButtonUp WMMButtonDBLCLK WMMButtonDown WMMButtonQuadCLK WMMButtonTripleCLK WMMButtonUp WMMouseHWheel WMMouseMove WMMouseWheel WMRButtonDBLCLK WMRButtonDown WMRButtonQuadCLK WMRButtonTripleCLK WMRButtonUp WMXButtonDBLCLK WMXButtonDown WMXButtonQuadCLK WMXButtonTripleCLK WMXButtonUp

From TLCLComponent (6)

DecLCLRefCount GetWSComponentClass IncLCLRefCount LCLRefCount NewInstance WidgetSetClass

From TComponent (62)

_AddRef _Release CanObserve ChangeName ComObject ComponentCount ComponentIndex Components ComponentState ComponentStyle DesignInfo DestroyComponents Destroying FindComponent FreeNotification FreeOnRelease GetChildOwner GetChildParent GetDeltaStreams GetEnumerator GetIDsOfNames GetNamePath GetObservers GetOwner GetTypeInfo GetTypeInfoCount iicrGetComponent InsertComponent Invoke IsImplementorOf Loading Name ObserverAdded Observers OnGetDeltaStreams Owner PaletteCreated QueryInterface ReadDeltaState ReadDeltaStream ReferenceInterface RemoveComponent RemoveFreeNotification RemoveFreeNotifications SafeCallException SetAncestor SetChildOrder SetDesigning SetDesignInstance SetInline SetSubComponent Tag ToString TToStringNameMode Updated UpdateRegistry Updating ValidateContainer ValidateInsert ValidateRename VCLComObject WriteState

From TPersistent (4)

Assign FPOAttachObserver FPODetachObserver FPONotifyObservers

From TObject (35)

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

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