[Overview][Constants][Types][Classes][Procedures and functions][Index] |
[Properties (by Name)] [Methods (by Name)] [Events (by Name)]
A combination of an edit box and a (drop-down) list allowing one of several options to be chosen.
Source position: stdctrls.pp line 450
type TComboBox = class(TCustomComboBox) |
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Specifies the placement of the control inside its Parent. |
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The set of anchor definitions for this control. |
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property ArrowKeysTraverseList: Boolean; |
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Indicates if keyboard Arrow (or cursor) keys to move through the list. |
property AutoComplete: Boolean; |
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Positions the list box using partial text matching. |
property AutoCompleteText: TComboBoxAutoCompleteText; |
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Options for the behavior of the Auto-Complete feature. |
property AutoDropDown: Boolean; |
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Makes the drop-down list appear as soon as the user starts entering text. |
property AutoSelect: Boolean; |
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Selects the entire content of the edit box when the control receives the focus. |
property AutoSize: Boolean; |
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Allows automatic adjustment of the size for the control, according to its content. |
property BidiMode: TBiDiMode; |
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Customization (of text controls) in bidirectional reading environments. |
property BorderSpacing: TControlBorderSpacing; |
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Determines the inner and outer border spacing for this control. |
property BorderStyle: TBorderStyle; |
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Indicates if borders are displayed around the control. |
property CharCase: TEditCharCase; |
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Indicates the case conversion applied to the value entered in the edit box for the control. |
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The background color of the control. |
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property Constraints: TSizeConstraints; |
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The minimum and maximum Width and Height for the control. |
property DoubleBuffered: Boolean; |
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Allows to reduce flicker in the painting of the control. |
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 DropDownCount: Integer; |
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The maximum number of Items visible in the drop-down list for the control. |
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 an item in the drop-down for the control. |
property ItemIndex: Integer; |
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The index of the currently selected item, or -1 if none is selected. |
property Items: TStrings; |
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The list of items displayed in the combo-box 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 for text entered in the edit box for the control. |
property OnChange: TNotifyEvent; |
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Event handler signalled for user changes to the 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 OnContextPopup: TContextPopupEvent; |
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Invoked when a context-sensitive pop-up menu is requested. |
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 OnEndDrag: TEndDragEvent; |
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Notification handler for the end of a dragging operation. |
property OnDropDown: TNotifyEvent; |
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Handler invoked when the list has dropped down. |
property OnEditingDone: TNotifyEvent; |
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Event handler signalled when editing is done. |
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 OnGetItems: TNotifyEvent; |
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Handler invoked when widgetset items list can be populated. |
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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 OnMeasureItem: TMeasureItemEvent; |
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Handler invoked when the height for an item is needed. |
property OnMouseDown: TMouseEvent; |
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Event handler for mouse button going down. |
property OnMouseEnter: TNotifyEvent; |
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Event handler for mouse entering the area of the control. |
property OnMouseLeave: TNotifyEvent; |
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Event handler for mouse leaving the area of the control. |
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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Event handler for mouse wheel turned. |
property OnMouseWheelDown: TMouseWheelUpDownEvent; |
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Event handler for downward movement of mouse wheel. |
property OnMouseWheelUp: TMouseWheelUpDownEvent; |
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Event handler for upward movement of the mouse wheel. |
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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Allows to use the BiDiMode settings in the Parent control. Default is true. |
property ParentColor: Boolean; |
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Uses the Color from the Parent control, when enabled. |
property ParentDoubleBuffered: Boolean; |
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Value from the DoubleBuffered property in a Parent control. |
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; |
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Disallows free-form entry of Text into the combo-box edit field. |
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 in alphanumeric order. |
property Style: TComboBoxStyle; |
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Appearance and behavior of the combo-box. |
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Determines the sequence of control navigation when the user presses the Tab key. |
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property TabStop: Boolean; |
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Enables or disables navigation using the Tab key. |
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The value in the edit box for the control. |
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property TextHint: TTranslateString; |
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Default hint text shown when the Text property is empty and the control is not focused. |
property Visible: Boolean; |
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Allows the control, and all of its children, to be displayed or hidden. |
end; |
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A combination of an edit box and a (drop-down) list allowing one of several options to be chosen. |
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The base class for combo-box 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 which have an associated widget. |
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TComponent |
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TObject |
The Text property reflects the text entered into the edit box, or selected from the list.
The selectable values are kept in the Items list. Clicking on the ellipsis character (...), next to Items in the Object Inspector, opens an editor which allows the designer to populate the Items list.
At run-time, the entry selected from the list replaces the text in the edit box, and ItemIndex holds the (zero-based) index number of the selected item.
If no value is selected from the drop-down list, the default text (if any) remains, or any information typed directly into Text will be returned, and ItemIndex takes the value of -1.
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How to use StdCtrls, ComCtrls or ExtCtrls. |
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The list of items displayed in the combo-box control. |
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The index of the currently selected item, or -1 if none is selected. |
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