[Overview][Types][Classes][Procedures and functions][Index] | Reference for unit 'ComboEx' (#lcl)

# TComboBoxEx

[Properties (by Name)] [Methods (by Name)] [Events (by Name)]

Implements an extended combo-box component.

## Declaration

Source position: comboex.pas line 187

`type TComboBoxEx = class(TCustomComboBoxEx)`
`published`
`property Align: TAlign;` |  | Specifies the placement of the control on its Parent control.
`property Anchors: TAnchors;` |  | The set of anchor definitions for this control.
`property ArrowKeysTraverseList: Boolean;` |  | Indicates if keyboard Arrow (or cursor) keys can be used to move through the list.
`property AutoComplete: Boolean;` |  | Positions the list box using partial text matching.
`property AutoCompleteOptions: TAutoCompleteOptions;` |  | Contains settings for auto-complete features enabled in the control.
`property AutoCompleteText: TComboBoxAutoCompleteText;` |  | Options for the behavior of the Auto-Complete feature.
`property AutoDropDown: Boolean;` |  | Makes the drop-down list appear as soon as the user starts entering text.
`property AutoSelect: Boolean;` |  | Selects the entire content of the edit box when the control receives the focus.
`property AutoSize: Boolean;` |  | Allows automatic adjustment of the size for the control, according to its content.
`property BidiMode: TBiDiMode;` |  | Indicates whether text controls use in bi-directional reading.
`property BorderSpacing: TControlBorderSpacing;` |  | Determines the inner and outer border spacing for this control.
`property BorderStyle: TBorderStyle;` |  | Indicates the border style displayed around the control.
`property CharCase: TEditCharCase;` |  | Indicates the case conversion applied to the value entered in the edit box for the control.
`property Color: TColor;` |  | The background color for the control.
`property Constraints: TSizeConstraints;` |  | Contains the minimum and maximum Width and Height for the control.
`property DragCursor: TCursor;` |  | The cursor shape shown during a drag operation.
`property DragKind: TDragKind;` |  | Indicates the action performed for a drag operation: drag-and-drop or drag-and-dock.
`property DragMode: TDragMode;` |  | Determines how a drag operation is started for the control.
`property DropDownCount: Integer;` |  | The maximum number of Items visible in the drop-down list for the control.
`property Enabled: Boolean;` |  | Determines whether the control responds to mouse or keyboard input.
`property Font: TFont;` |  | The font to be used for text display in this control.
`property Images: TCustomImageList;` |  | Contains images which can be displayed for items defined in the ItemsEx property.
`property ImagesWidth: Integer;` |  | Specifies the width for images displayed in the control.
`property ItemHeight: Integer;` |  | The default height of an item in the drop-down for the control.
`property ItemsEx: TComboExItems;` |  | Collection with the extended items defined for the control.
`property ItemIndex: Integer;` |  | The index of the currently selected item, or -1 if no item is selected.
`property ItemWidth: Integer;` |  | The minimum width of the items in the drop-down list.
`property MaxLength: Integer;` |  | The maximum length for text entered in the edit box for the control.
`property ParentBidiMode: Boolean;` |  | Indicates whether the BiDiMode settings in the Parent control are used.
`property ParentColor: Boolean;` |  | Use the Color from the Parent control, when enabled.
`property ParentFont: Boolean;` |  | Indicates if the Font from the Parent control is used in the control.
`property ParentShowHint: Boolean;` |  | 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;` |  | A context-sensitive menu that pops up when the right mouse button is clicked over this control.
`property ShowHint: Boolean;` |  | Enables Hint display for the control.
`property Style: TComboBoxExStyle;` |  | Specifies the control style used for the edit in the combo-box control.
`property StyleEx: TComboBoxExStyles;` |  | Enables features or behaviors in the extended combo-box control.
`property TabOrder: TTabOrder;` |  | Indicates the navigation order for the control when the user presses the Tab or Shift+Tab key.
`property TabStop: Boolean;` |  | Allows the user to navigate to / from the control by pressing the Tab or Shift+Tab keys.
`property Text: TCaption;` |  | The value in the edit box for the control.
`property TextHint: TTranslateString;` |  | Default hint text shown when the Text property is empty for the control.
`property Visible: Boolean;` |  | Allows the control, and all of its children, to be displayed or hidden.
`property OnChange: TNotifyEvent;` |  | Event handler signalled for user changes to the text in the edit box.
`property OnChangeBounds: TNotifyEvent;` |  | Event handler signalled when the Bounds for the control have been changed.
`property OnClick: TNotifyEvent;` |  | Notification handler for mouse clicks.
`property OnCloseUp: TNotifyEvent;` |  | Handler invoked when the drop-down list closes.
`property OnContextPopup: TContextPopupEvent;` |  | Invoked when a context-sensitive pop-up menu is requested.
`property OnDblClick: TNotifyEvent;` |  | Event handler signalled when a mouse double click occurs in the control.
`property OnDragDrop: TDragDropEvent;` |  | Event handler signalled when an object is dropped onto the control.
`property OnDragOver: TDragOverEvent;` |  | Event handler signalled when a control is dragged over the control instance.
`property OnDropDown: TNotifyEvent;` |  | Handler invoked when the list has dropped down.
`property OnEditingDone: TNotifyEvent;` |  | Event handler signalled when editing is completed for the control.
`property OnEndDock: TEndDragEvent;` |  | Event handler signalled for the end of a drag-dock operation.
`property OnEndDrag: TEndDragEvent;` |  | Event handler signalled for the end of a drag-drop operation.
`property OnEnter: TNotifyEvent;` |  | Event handler signalled when the control receives focus.
`property OnExit: TNotifyEvent;` |  | Event handler signalled when the control loses focus.
`property OnGetItems: TNotifyEvent;` |  | Handler invoked when widgetset items list can be populated.
`property OnKeyDown: TKeyEvent;` |  | Event handler signalled for key down keyboard events.
`property OnKeyPress: TKeyPressEvent;` |  | Event handler signalled for character data entered by the user.
`property OnKeyUp: TKeyEvent;` |  | Event handler signalled when a key up event has occurred for the control.
`property OnMouseDown: TMouseEvent;` |  | Event handler signalled when a mouse down event is handled for the control.
`property OnMouseEnter: TNotifyEvent;` |  | Event handler signalled when the mouse pointer has entered the control.
`property OnMouseLeave: TNotifyEvent;` |  | Event handler signalled when the mouse pointer has left the control.
`property OnMouseMove: TMouseMoveEvent;` |  | Event handler signalled when the mouse pointer is moved in the control.
`property OnMouseUp: TMouseEvent;` |  | Event handler signalled when a mouse up event is handled for the control.
`property OnMouseWheel: TMouseWheelEvent;` |  | Event handler for mouse wheel turned.
`property OnMouseWheelDown: TMouseWheelUpDownEvent;` |  | Event handler signalled for a downward movement of the mouse wheel.
`property OnMouseWheelUp: TMouseWheelUpDownEvent;` |  | Event handler signalled for an upward movement of the mouse wheel.
`property OnSelect: TNotifyEvent;` |  | Handler invoked when an item is selected.
`property OnStartDock: TStartDockEvent;` |  | Event handler for the start of a docking operation.
`property OnStartDrag: TStartDragEvent;` |  | Event handler signalled for the start of a dragging operation.
`property OnUTF8KeyPress: TUTF8KeyPressEvent;` |  | Handler for a character entered by the user.
`end;`

## Inheritance

`TComboBoxEx` |  | Implements an extended combo-box component.
`TCustomComboBoxEx` |  | Implements the base class for an extended/enhanced combo-box.
`TCustomComboBox` |  | The base class for combo-box components.
`TWinControl` |  | Implements a windowed control which can contain other child controls.
`TControl` |  | The base class for visible controls.
`TLCLComponent` |  | The base class for LCL components which have an associated widget.
`TComponent`
?
`TObject`

## Description

TComboBoxEx is a TCustomComboBoxEx descendant which implements an extended combo-box component.

TComboBoxEx provides an extended combo-box with added features and capabilities like auto completion, additional display styles, more editing options, and a list with Images used in the control. Another key feature in the class is an extended Items property which provides normal, selected, and overlay image indexes and allows indentation between the image and caption for items in the combo-box. A pointer to arbitrary data for Items used in sort operations is also provided.

## See also

TCustomComboBoxEx |  | Implements the base class for an extended/enhanced combo-box.