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TDBComboBox - a data-aware version of TComboBox to allow selection of a value from a list of entries into a database field
Source position: dbctrls.pp line 708
type TDBComboBox = class(TCustomDBComboBox) end; |
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protected |
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procedure DataChange(); override; |
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DataChange - updates the text if it has changed |
procedure KeyDown(); override; |
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procedure KeyPress(); override; |
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procedure Select; override; |
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procedure UpdateData(); override; |
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UpdateData - copies the new data via the datalink |
published |
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The set of anchor definitions for this control. |
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property ArrowKeysTraverseList: Boolean; |
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Allows the operator to use also the keyboard Arrow keys to move through the list. |
property AutoDropDown: Boolean; |
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Makes the drop-down list appear as soon as the user starts entering text. |
property AutoComplete: Boolean; |
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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. |
property BorderStyle: TBorderStyle; |
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property CharCase: TEditCharCase; |
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The background color of the control. |
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property DataField: string; |
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The name (as a string) of the Feild whose data are to be linked to the ComboBox |
property DataSource: TDataSource; |
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The identity of the DataSource to which the ComboBox is attached |
property DragCursor: TCursor; |
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The cursor shape shown while the control is dragged. |
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Allows the user to drag the control. |
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property DropDownCount: Integer; |
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The height of the drop-down list, measured in number of items. |
property Enabled: Boolean; |
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Determines whether the control reacts on mouse or keyboard input. |
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The font to be used for text display in this control. |
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property ItemHeight: Integer; |
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The default height of a list item. |
property Items: TStrings; |
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The list of all items in the control. |
property ItemWidth: Integer; |
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The minimum width of the items in the drop-down list. |
property MaxLength: Integer; |
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The maximum length of user input. |
property OnChange: TNotifyEvent; |
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Event handler for user changed text in the edit box. |
property OnChangeBounds: TNotifyEvent; |
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Event handler for a change of the Bounds of the control. |
property OnClick: TNotifyEvent; |
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Notification handler for mouse clicks. |
property OnCloseUp: TNotifyEvent; |
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Handler invoked when the drop-down list closes. |
property OnDblClick: TNotifyEvent; |
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Event Handler for double 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 OnDrawItem: TDrawItemEvent; |
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Handler for special painting of an item (in owner-draw mode). |
property OnDropDown: TNotifyEvent; |
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Handler invoked when the list has dropped down. |
property OnEditingDone: TNotifyEvent; |
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Event handler when editing is done. |
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. |
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Handler for keyboard key pressed. |
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property OnKeyPress: TKeyPressEvent; |
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Handler for a character entered by the user. |
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Handler for keyboard key released. |
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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 OnSelect: TNotifyEvent; |
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Handler invoked when an item is selected. |
property OnStartDrag: TStartDragEvent; |
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Event handler for the start of a dragging operation. |
property OnUTF8KeyPress: TUTF8KeyPressEvent; |
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Handler for a character entered by the user. |
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 ReadOnly: Boolean; |
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Disallows entry of free text. |
property ShowHint: Boolean; |
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Enables the Hint display. |
property Sorted: Boolean; |
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Determines whether the list entries are sorted. |
property Style: TComboBoxStyle; |
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Appearance and behaviour of the ComboBox (static/drop-down, owner-draw...). |
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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 Visible: Boolean; |
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Allows to show or hide the control, and all of its children. |
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TDBComboBox - a data-aware version of TComboBox to allow selection of a value from a list of entries into a database field |
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TCustomDBComboBox - a Data-aware Combo Box for displaying information from a Database |
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The base class for ComboBox components. |
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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 |
TDBComboBox has properties similar to TComboBox and TCustomComboBox. It consists of an Edit Box which is th eData-aware part of the component, and a drop-down list box.
In a typical application a user would be presented with the drop-down list, would make a selection and then this would appear in the edit box and become the data value for that cell in the database.
So for example a list of countries might be presented, and the selected value from the list would be used to populate the appropriate field ('Country') in that record of the database.
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HowToUseDataAwareControls - Hints for accessing databases |
lazarus-ccr.sourceforge.net |