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

# TFilterComboBox

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

Implements a combo-box used to select a file filter.

## Declaration

Source position: filectrl.pp line 170

`type TFilterComboBox = class(TCustomFilterComboBox)`
`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 AutoComplete: Boolean;` |  | Positions the list box using partial text matching.
`property AutoDropDown: Boolean;` |  | Makes the drop-down list appear as soon as the user starts entering text.
`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 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 Enabled: Boolean;` |  | Determines whether the control responds to mouse or keyboard input.
`property Filter: string; [rw]` |  | Contains one or more file filters used in the combo-box.
`property Font: TFont;` |  | The font to be used for text display in this control.
`property ItemIndex: Integer;` |  | The index of the currently selected item, or -1 if no item is selected.
`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 ShellListView: TShellListView;` |  | Connects the control to a TShellListView instance.
`property ShowHint: Boolean;` |  | Enables Hint display for the 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 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 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 OnEndDrag: TEndDragEvent;` |  | Event handler signalled for the end of a drag-drop operation.
`property OnDropDown: TNotifyEvent;` |  | Handler invoked when the list has dropped down.
`property OnEnter: TNotifyEvent;` |  | Event handler signalled when the control receives focus.
`property OnExit: TNotifyEvent;` |  | Event handler signalled when the control loses focus.
`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 OnStartDrag: TStartDragEvent;` |  | Event handler signalled for the start of a dragging operation.
`property OnSelect: TNotifyEvent;` |  | Handler invoked when an item is selected.
`property OnUTF8KeyPress: TUTF8KeyPressEvent;` |  | Handler for a character entered by the user.
`end;`

## Inheritance

`TFilterComboBox` |  | Implements a combo-box used to select a file filter.
`TCustomFilterComboBox` |  | Specifies a combo-box used to select a file filter.
`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

TFilterComboBox is a TCustomFilterComboBox descendant which implements a combo-box used to select files which match a selection filter. Use the Filter property to define the filter names and expressions available in the drop-down for the combo-box. Only the filter name is displayed in the combo-box.

Use AutoComplete to enable or disable case-insensitive automatic text completion in the edit area for the combo-box. When set to True, the Filter which starts the typed value is located and selected in the control. Please note that AutoComplete works when the text area is empty, or the entire contents of the editable are are selected.

Use ItemIndex to get the ordinal position in Filter for the selected filter. Use the OnSelect event handler to perform actions needed when a new value is selected in the combo-box.

TFilterComboBox includes a ShellListView property with the TShellListView instance used to display the list of files matching the selected filter. ShellListView is updated (when assigned) in the Select method to use the value in Mask in the list view control. Set the Root property in ShellListView to control the directory displayed in the control.

TFilterComboBox sets the visibility for properties defined in an ancestor class, and does not introduce any new properties, methods, or events. Please note that Some properties are not published for the control, so do they do not appear in the Object Inspector at design-time. For example: Mask.

## See also

TCustomFilterComboBox |  | Specifies a combo-box used to select a file filter.
TShellListView |  | Implements a list view control to display the files, directories and other objects (such as devices) on the local file system.