The DBComboBox class implements the DBComboBox development environment component that displays and edits data organized as a combobox.
| Property name | Brief description | |
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The DataField property determines the field of the data source, with which the component is linked. | |
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The DataSource property links the DBComboBox component to the data set that contains the DataField field. | |
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The Field property returns parameters of the field, with which the component is linked. | |
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The ReadOnly property determines whether the user can edit the current record field value. |
| Property name | Brief description | |
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DropDownCount |
The DropDownCount property determines the maximum number of elements simultaneously displayed in the drop-down list. |
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DroppedDown |
The DroppedDown property returns True if the component combobox is expanded. |
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ItemCount |
The ItemCount property returns the number of combobox lines. |
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ItemHeight |
The ItemHeight property returns the height of combobox elements (lines). |
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ItemIndex |
The ItemIndex property determines the index of the selected combobox element. |
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Items |
The Items property returns the combobox lines collection. |
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MaxLength |
The MaxLength property determines the maximum length of the entered text. |
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SelLength |
The SelLength property determines the length in characters of the selected component text. |
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SelStart |
The SelStart property determines the position to start text selection in the component. |
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SelText |
The SelText property determines text selected in the component. |
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Sorted |
The Sorted property determines whether combobox lines are automatically sorted in alphabetical order. |
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Style |
The Style property determines the display style of combobox. |
| Property name | Brief description | |
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Align | The Align property determines component alignment within its parent component. |
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AllowDrag | The AllowDrag property determines whether an object can be dragged from a component. |
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AllowDrop | The AllowDrop property determines whether the component can accept a dragged object. |
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Anchors | The Anchors property returns settings determining % of the resize for the current component when the parent component is resized. |
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Brush | The Brush property determines the brush that is used to fill the component area. |
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ClientHeight | The ClientHeight property determines the height of the client component area. |
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ClientWidth | The ClientWidth property determines the width of the client component area. |
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Color | The Color property determines color of the component background. |
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Cursor | The Cursor property determines how the cursor looks like when is it hovered over a component during form execution. |
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Enabled | The Enabled property determines whether a component is available for the user. |
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Focused | The Focused property returns True if the focus is set to the component. |
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Font | The Font property determines parameters of the font that is used to display text in the component. |
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Height | The Height property determines component height in pixels. |
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HelpContext | The HelpContext property determines a unique index for a section of a context help for this component. |
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Hint | The Hint property determines a tooltip text displayed on hovering over the component. |
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HintTimeout | The HintTimeout property determines for how long a tooltip is displayed. |
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Left | The Left property determines a coordinate of the component left edge in pixels. |
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Parent | The Parent property determines a parent component. |
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ParentColor | The ParentColor property determines whether a component inherits the color of the parent component. |
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ParentFont | The ParentFont property determines whether a component uses the font of the parent component. |
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ParentShowHint | The ParentShowHint property determines when a tooltip is displayed. |
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PopupMenu | The PopupMenu property determines the context menu displayed when the component is clicked with the right mouse button. |
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Scrolls | The Scrolls property returns parameters of component's scrollbars. |
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ShowHint | The ShowHint property determines whether a tooltip is displayed when the component is hovered. |
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TabOrder | The TabOrder property determines a component position in a tab order. |
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TabStop | The TabStop property determines whether the component must be focused when the Tab button is pressed. |
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Text | The Text property determines a row identifying a component for the user. |
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Top | The Top property determines a coordinate of the component top edge in pixels. |
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Visible | The Visible property determines whether the component is displayed when a form is executed. |
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Width | The Width property sets component width in pixels. |
| Property name | Brief description | |
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ComponentCount | The ComponentCount property returns the number of child components located on the parent component. |
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Components | The Components property returns a child component, which index is passed via the input parameter. |
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Data | The Data property is used to store any custom data. |
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Name | The Name property determines the component name. |
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Tag | The Tag property is not used by the compiler. The user can change the value of this property and use it at his discretion. |
| Method name | Brief description | |
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ClearEdit |
The ClearEdit method clears the combobox edit box. |
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SelectAll |
The SelectAll method selects all text in the combobox edit box. |
| Method name | Brief description | |
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The ClientToScreen method converts point coordinates specified relative to the component's coordinate system into screen coordinates. | |
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The DoDragDrop method enables the user to start dragging operation. | |
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The GetImage method returns a graphic presentation of a component together with all child components. | |
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The ScreenToClient method converts point's screen coordinates into coordinates specified relative to the component's coordinate system. | |
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The SetFocus method sets focus to this component. |
| Event name | Brief description | |
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OnChange |
The OnChange event occurs when the text in the component edit field is changed. |
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OnDropDown |
The OnDropDown event occurs on opening the combobox. |
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OnItemSelect |
The OnItemSelect event occurs when an element is selected in the combobox. |
| Event name | Brief description | |
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The OnBeginDrag event occurs for the component when the user starts to drag an object from the component. | |
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The OnClick event occurs if the user clicks the component area. | |
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The OnControlMove event occurs when the component is moved. | |
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The OnControlResize event occurs when the component is resized. | |
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The OnDblClick event occurs if the user double-clicks the component area. | |
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The OnDragDrop event occurs for the component if the user drops a dragged object over it. | |
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The OnDragEnter event occurs when a dragged object enters the component area. | |
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The OnDragLeave event occurs when a dragged object leaves component borders. | |
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The OnDragOver event occurs for the component when the user drags an object over it. | |
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The OnEnter event occurs when the component receives focus. | |
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The OnExit event occurs when the component loses focus. | |
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The OnHScroll event occurs when horizontal scrollbar slider changes its position. | |
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The OnKeyDown event occurs if the component is focused and a keyboard key is pressed. | |
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The OnKeyPress event occurs if the component is focused when the user presses a character key. | |
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The OnKeyPreview event occurs prior to each event related to key pressing. | |
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The OnKeyUp event occurs if the component is focused and the user releases any button previously pressed. | |
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The OnMouseDown event occurs if the pointer is in the component area and a mouse key is pressed. | |
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The OnMouseEnter event occurs when mouse cursor enters the component area. | |
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The OnMouseHover event occurs when mouse cursor is held in the component area. | |
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The OnMouseLeave event occurs when mouse cursor leaves the component area. | |
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The OnMouseMove event occurs when the cursor is moved over the component. | |
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The OnMouseUp event occurs when the mouse button is released and the cursor is in the component area. | |
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The OnMouseWheel event occurs if the component is focused when the user rotates a mouse wheel. | |
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The OnVScroll event occurs when vertical scrollbar slider changes its position. |
See also: