TCheckComboBox class

In unit ComboEx

Combo-box control which displays check boxes for the items in the control.

Declaration

pascal

TCheckComboBox = class(TCustomCheckCombo)

Inheritance

Description

TCheckComboBox is a TCustomCheckCombo descendant which implements a combo-box which displays check boxes for the Items in the control. It behaves like an ordinary combo-box with a drop-down using a customizable number of visible rows.

TCheckComboBox provides additional properties, methods, and events which allow the checked state for values in Items to be specified as either a Boolean or a TCheckBoxState value. An OnItemChange event handler is added to perform custom actions when the Checked value for an item is changed. Convenience methods are included which allow check boxes to be added or deleted, or toggle their value.

TCheckComboBox sets the visibility for property defined in ancestor classes.

Properties

`Align`	published	Specifies the placement of the control on its Parent control.
`AllowGrayed`	published	Indicates if check boxes can be drawn in the indeterminate state.
`Anchors`	published	The set of anchor definitions for this control.
`ArrowKeysTraverseList`	published	Indicates if keyboard Arrow (or cursor) keys can be used to move through the list.
`AutoDropDown`	published	Makes the drop-down list appear as soon as the user starts entering text.
`AutoSize`	published	Allows automatic adjustment of the size for the control, according to its content.
`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.
`Count`	published	Reflects the number of check boxes defined for the control.
`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.
`DropDownCount`	published	The maximum number of Items visible in the drop-down list for the control.
`Enabled`	published	Determines whether the control responds to mouse or keyboard input.
`Font`	published	The font to be used for text display in this control.
`ItemHeight`	published	The default height of an item in the drop-down for the control.
`ItemIndex`	published	The index of the currently selected item, or -1 if no item is selected.
`Items`	published	The list of items displayed in the combo-box control.
`ItemWidth`	published	The minimum width of the items in the drop-down list.
`MaxLength`	published	The maximum length for text entered in the edit box for the control.
`ParentBidiMode`	published	Indicates whether the BiDiMode settings in the Parent control are used.
`ParentColor`	published	Use the Color from the Parent control, when enabled.
`ParentFont`	published	Indicates if the Font from the Parent control is used in the 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.
`ShowHint`	published	Enables Hint display for the control.
`Sorted`	published	Determines whether the list entries are sorted in alphanumeric order.
`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.
`Text`	published	The value in the edit box for the control.
`TextHint`	published	Default hint text shown when the Text property is empty for the control.
`Visible`	published	Allows the control, and all of its children, to be displayed or hidden.

Events

`OnChange`	published	Event handler signalled for user changes to the text in the edit box.
`OnChangeBounds`	published	Event handler signalled when the Bounds for the control have been changed.
`OnClick`	published	Notification handler for mouse clicks.
`OnCloseUp`	published	Handler invoked when the drop-down list closes.
`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.
`OnEndDrag`	published	Event handler signalled for the end of a drag-drop operation.
`OnDropDown`	published	Handler invoked when the list has dropped down.
`OnEditingDone`	published	Event handler signalled when editing is completed for the control.
`OnEnter`	published	Event handler signalled when the control loses focus.
`OnExit`	published	Event handler signalled when the control loses focus.
`OnGetItems`	published	Handler invoked when widgetset items list can be populated.
`OnItemChange`	published	Event handler signalled when the state for a check box in the control is changed.
`OnKeyDown`	published	Event handler signalled for key down keyboard events.
`OnKeyPress`	published	Event handler signalled for character data entered by the user.
`OnKeyUp`	published	Event handler signalled when a key up event has occurred for the control.
`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.
`OnStartDrag`	published	Event handler signalled for the start of a dragging operation.
`OnSelect`	published	Handler invoked when an item is selected.
`OnUTF8KeyPress`	published	Handler for a character entered by the user.