TDBListBox class

In unit DBCtrls

Implements a data-aware version of TListBox.

Declaration

pascal

TDBListBox = class(TCustomDBListBox)

Inheritance

Description

TDBListBox implements a data-aware version of TListBox. The control allows selection and storage of a value from a scrolling list of choices to the current record in a linked dataset.

TDBListBox extends the TCustomDBListBox ancestor class to implement abstract/virtual methods, and to set the visibility for properties in the control.

Use the Items property to define the list of choices displayed in the listbox control.

The DataSource property provides access to the linked dataset where the selected value is stored. Field contains the field definition for the column in the dataset where the selected value is stored. Use the DataField property to specify the name for the Field.

Properties

`Align`	published	Specifies the placement of the control on its Parent control.
`Anchors`	published	The set of anchor definitions for this control.
`BiDiMode`	published	Indicates whether text controls use in bi-directional reading.
`BorderSpacing`	published	Determines the inner and outer border spacing for this control.
`BorderStyle`	published	Indicates the border style displayed around the control.
`Color`	published	The background color for the control.
`Constraints`	published	Contains the minimum and maximum Width and Height for the control.
`DataField`	published	Name for the field in the linked dataset used in the control.
`DataSource`	published	Provides access to the linked dataset for the control.
`DoubleBuffered`	published	When enabled, it reduces flicker when the control is painted.
`DragCursor`	published	The cursor shape shown during a drag operation.
`DragKind`	published	Indicates the action performed for a drag operation: drag-and-drop or drag-and-dock.
`DragMode`	published	Determines how a drag operation is started for the control.
`Enabled`	published	Determines whether the control responds to mouse or keyboard input.
`ExtendedSelect`	published	True when a contiguous range of items can be selected using Shift+Click. The default value is True.
`Font`	published	The font to be used for text display in this control.
`ItemHeight`	published	The default height for an item displayed in the list.
`Items`	published	The list of items defined for the control.
`MultiSelect`	published	Allows selection of more than one item from the list.
`Options`	published	Contains options enabled for the list box control.
`ParentBiDiMode`	published	Indicates whether the BiDiMode settings in the Parent control are used.
`ParentDoubleBuffered`	published	Value for the DoubleBuffered property in a Parent control.
`ParentShowHint`	published	If True, the value of ShowHint for the control will be the same as the one from the Parent. Default is True.
`PopupMenu`	published	A context-sensitive menu that pops up when the right mouse button is clicked over this control.
`ReadOnly`	published	Indicates if the linked dataset for the control cannot be modified.
`ShowHint`	published	Enables Hint display for the control.
`Sorted`	published	Determines whether the list entries are sorted in alphanumeric order.
`Style`	published	Controls the appearance of items on the list box control and indicates whether the control uses "virtual mode".
`TabOrder`	published	Indicates the navigation order for the control when the user presses the Tab or Shift+Tab key.
`TabStop`	published	Allows the user to navigate to / from the control by pressing the Tab or Shift+Tab keys.
`TopIndex`	published	Index of the first visible (or top-most) item.
`Visible`	published	Indicates if the control is visible on the parent.

Methods

`DataChange`	protected	Implements the event handler signalled when data in the linked dataset has been changed.
`DoSelectionChange`	protected	Performs actions needed when the current selection in the listbox control is changed.
`UpdateData`	protected	Performs actions needed to update the linked dataset when the value for the control has changed.
`EditingDone`	public	EditingDone - what to do when you have finished editing.

Events

`OnClick`	published	Notification handler for mouse clicks.
`OnContextPopup`	published	Invoked when a context-sensitive pop-up menu is requested.
`OnDblClick`	published	Event handler signalled when a mouse double click occurs in the control.
`OnDragDrop`	published	Event handler signalled when an object is dropped onto the control.
`OnDragOver`	published	Event handler signalled when a control is dragged over the control instance.
`OnDrawItem`	published	Event handler signalled to draw an Item on the data-aware list box.
`OnEndDrag`	published	Event handler signalled for the end of a drag-drop operation.
`OnEnter`	published	Event handler signalled when the control receives focus.
`OnExit`	published	Event handler signalled when the control loses focus.
`OnKeyPress`	published	Event handler signalled when a key is pressed while the control has focus.
`OnKeyDown`	published	Event handler signalled when a key is down while the control has focus.
`OnKeyUp`	published	Event handler signalled when a key is up (not pressed) while the control has focus.
`OnMouseDown`	published	Event handler signalled when a mouse down event is handled for the control.
`OnMouseEnter`	published	Event handler signalled when the mouse pointer has entered the control.
`OnMouseLeave`	published	Event handler signalled when the mouse pointer has left the control.
`OnMouseMove`	published	Event handler signalled when the mouse pointer is moved in the control.
`OnMouseUp`	published	Event handler signalled when a mouse up event is handled for the control.
`OnMouseWheel`	published	Event handler for mouse wheel turned.
`OnMouseWheelDown`	published	Event handler signalled for a downward movement of the mouse wheel.
`OnMouseWheelUp`	published	Event handler signalled for an upward movement of the mouse wheel.
`OnResize`	published	Notification handler for a resize of the control.
`OnStartDrag`	published	Event handler signalled for the start of a dragging operation.
`OnUTF8KeyPress`	published	Handler for a character entered by the user.