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TDBCheckBox - a data-aware checkbox for use with logical fields in a database
Source position: dbctrls.pp line 595
type TDBCheckBox = class(TCustomCheckBox) end; |
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protected |
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function GetFieldCheckState; virtual; |
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GetFieldCheckState - returns the checkbox state for the current field |
procedure DataChange(); |
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DataChange - uses GetFieldCheckState to update the State |
procedure DoOnChange; override; |
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procedure UpdateData(); |
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UpdateData - examines the State to see whether it has changed |
procedure Notification(); override; |
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public |
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constructor Create(); override; |
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Create - constructor for TDBCheckBox: calls inherited Create, forms logical connections for checked and unchecked, sets initial style and state, forms datalinks and actions |
destructor Destroy; override; |
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Destroy - destructor for TDBCheckBox: frees links and calls inherited Destroy |
function ExecuteAction(); override; |
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function UpdateAction(); override; |
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property Checked: Boolean; |
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The state of the check mark. Here always False, can be implemented in derived classes. |
property Field: TField; [r] |
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The Field in the DataSet with which the box is to be associated |
property State: TCheckBoxState; |
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Indicates whether the check box is checked (selected), unchecked (deselected) or grayed (disabled). |
published |
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property AllowGrayed: Boolean; |
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Allows the check box to be in a "grayed" state. |
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The set of anchor definitions for this control. |
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property AutoSize: Boolean; |
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Allows to automatically adjust the size of the control, according to its content. |
property BiDiMode: TBiDiMode; |
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property BorderSpacing: TControlBorderSpacing; |
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Determines the inner and outer border spacing for this control. |
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The text describing the control to the user. |
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The background color of the control. |
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property DataField: string; [rw] |
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The name (as a string) of the field with which the checkbox is to be associated |
property DataSource: TDataSource; [rw] |
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The DataSource containing the Field that is to be associated with this checkbox |
property DragCursor: TCursor; |
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The cursor shape shown while the control is dragged. |
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The operation when the control is dragged - Drag or Dock. |
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Allows the user to drag the control. |
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property Enabled: Boolean; |
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Determines whether the control reacts on mouse or keyboard input. |
property Hint: TTranslateString; |
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The text to show in the Hint window for this control. |
property OnChange: TNotifyEvent; |
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Handler for any change in properties of the control. |
property OnClick: TNotifyEvent; |
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Notification handler for mouse clicks. |
property OnDragDrop: TDragDropEvent; |
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This handler determines the action on an drop onto this control, in a drag-drop operation. |
property OnDragOver: TDragOverEvent; |
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Event handler for a control being dragged over this control. |
property OnEndDrag: TEndDragEvent; |
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Notification handler for the end of a dragging operation. |
property OnEnter: TNotifyEvent; |
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Handler for control receiving the focus. |
property OnExit: TNotifyEvent; |
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Handler for control loosing the focus. This is a good place for checking the finished user input. |
property OnMouseDown: TMouseEvent; |
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Event handler for mouse button going down. |
property OnMouseEnter: TNotifyEvent; |
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property OnMouseLeave: TNotifyEvent; |
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property OnMouseMove: TMouseMoveEvent; |
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Event handler for mouse movement within the control. |
property OnMouseUp: TMouseEvent; |
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Event handler for mouse button going up. |
property OnMouseWheel: TMouseWheelEvent; |
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property OnMouseWheelDown: TMouseWheelUpDownEvent; |
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property OnMouseWheelUp: TMouseWheelUpDownEvent; |
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property OnStartDrag: TStartDragEvent; |
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Event handler for the start of a dragging operation. |
property ParentBiDiMode: Boolean; |
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property ParentColor: Boolean; |
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If true, the Color of the control will be the same as the one from the Parent. Default is true. |
property ParentFont: Boolean; |
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If true, the Font of the control will be the same as the one from the Parent. Default is true. |
property ParentShowHint: Boolean; |
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If true, the value of ShowHint for the control will be the same as the one from the Parent. Default is true. |
property PopupMenu: TPopupMenu; |
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A context-sensitive menu that pops up when the right mouse button is clicked over this control |
property ReadOnly: Boolean; [rw] |
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ReadOnly - if True, data may be read but not written or modified (doesn't make much sense for a check-box unless the box is NOT Enabled!) |
property ShowHint: Boolean; |
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Enables the Hint display. |
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Determines the sequence of controls, reachable when the user presses the Tab key. |
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property TabStop: Boolean; |
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Allows the user to navigate to this control, by pressing the Tab key. |
property ValueChecked: string; [rw] |
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ValueChecked - the value to use when the box is checked, for example True or 1 |
property ValueUnchecked: string; [rw] |
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ValueUnchecked - the value to use when the box is unchecked, for example False or 0 |
property Visible: Boolean; |
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Allows to show or hide the control, and all of its children. |
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TDBCheckBox - a data-aware checkbox for use with logical fields in a database |
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The base class for checkbox components. |
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The base class for various button controls. |
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The base class for controls which can contain other (child) controls. |
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The base class for visible controls. |
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The base class for LCL components associated with widgets. |
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TComponent |
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TObject |
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HowToUseDataAwareControls - Hints for accessing databases |
lazarus-ccr.sourceforge.net |