TSRVCustomComboBox is the base class for combo box controls.
Unit SRVComboBox;
Syntax
TSRVCustomComboBox = class(TSRVEditControl);
Hierarchy
TObject
TPersistent
TComponent
TControl
TWinControl
Properties and events
Public properties
Property |
Type |
Default value |
Meaning |
AutoComplete |
Boolean |
True |
Specifies whether the combo box automatically completes words that the user types by selecting the first item that begins with the currently typed string. |
AutoDropDown |
Boolean |
False |
Specifies whether the drop-down list drops down automatically in response to user keystrokes. |
AutoSize |
Boolean |
True |
Determines whether the height of the edit region automatically resizes to accommodate the text height |
CharCase |
TSRVEditCharCase |
srvecNormal |
Determines the case of the text within the edit region: srvecNormal, srvecUpperCase, srvecLowerCase |
Color |
TColor |
clWindow |
Background color of the editing region. |
DoubleBuffered |
Boolean |
False |
Determines whether the control’s image is rendered directly to the window or painted to an in-memory bitmap first. Double buffering reduces the amount of flicker when the control repaints, but is more memory intensive. |
DropDownCount |
Integer |
5 |
Specifies the maximum number of items displayed in the drop-down list. |
DropDownHints |
Integer |
10 |
Defines how many hints (suggestions) are visible in a list. |
HideSelection |
Boolean |
True |
Determines whether the visual indication of the selected text remains when focus shifts to another control. |
HintsItemSkinSchemeIndex |
Integer |
|
An index in SkinManager.CurrentSkin.BoxSchemes collection, for items in the list of hints (suggestions) |
HintsScrollBarSkinSchemeIndex |
Integer |
|
An index in SkinManager.CurrentSkin.VerticalScrollBarSchemes collection, for scrollbars in the list of hints (suggestions) |
HintsSkinSchemeIndex |
Integer |
|
An index in SkinManager.CurrentSkin.BoxSchemes collection, for the list of hints (suggestions) |
ImageList |
TCustomImageList |
|
Specifies the images that appear next to items in the list box. |
ItemHeight |
Integer |
20 |
Specifies the height in pixels of an item in an owner-draw list. |
ItemIndex |
Integer |
|
Specifies the ordinal number of the selected item. |
ItemWidth |
Integer |
0 |
If set to a positive value, defines a width of a drop down list. |
Items |
|
Items, a collection of TSRVCBoxItem. |
|
ListMarginHeight |
Integer |
2 |
Height of the top and bottom margins of the drop down list. |
ListMarginWidth |
Integer |
3 |
Width of left and right margins of the drop down list. |
MaxLength |
Integer |
0 |
Specifies the maximum number of characters the user can type into the edit portion (0 for unlimited) |
Modified |
Boolean |
|
Indicates whether the user edited the text of the edit control. |
ReadOnly |
Boolean |
False |
Determines whether the user can change the text of the edit region. |
|
|
Read-only. Returns a scroll bar object. |
|
SelectedItemBackColor |
|
clHighlight |
Background color for the selected item. |
SelectedItemBorderColor |
|
clSilver |
Border color for the selected item. |
SelectedItemTextColor |
|
clHighlightText |
Text color for the selected item. |
Sorted |
Boolean |
False |
Specifies whether the items in a list box are arranged alphabetically. |
Style |
TComboBoxStyle |
csDropDown |
Determines the display style of the combo box. |
Text |
String |
|
Text in the editing region. |
UseItemFontNames |
Boolean |
False |
Specifies whether the FontName properties of items are used to display their Captions. |
Public events
OnChange occurs when the user changes the text displayed in the edit region.
OnDropDown occurs when the user opens the drop-down list.
OnMeasureItem occurs when the application needs to redisplay an item in a variable height owner-draw list box.
OnDrawItem occurs when an item in an owner-draw list box needs to be redisplayed.
OnEditHints occurs when a list of hints (suggestions) is about to be displayed. See the section about "Hints (Suggestions)" for TSRVEdit.
See also properties and events inherited from TSRVEditControl.
Methods
BeginUpdate/EndUpdate locks/unlocks redrawing.
IndexOf returns the index of item by its Caption.
HasParent returns True if the given item has a parent item.
GetParent returns the index of the parent item for the given item.
AppendItem adds an item with the specified properties to the end of the item list.
InsertItem inserts an item with the specified properties at the position Index.
DeleteItem deletes the specified item.
