JVCL Help:TJvComboListBox.OnDropDown

 JVCL Help: TJvComboListBox.OnDropDown Event

TJvComboListBox

► TJvComboListBox Events

[+] TJvComboListBox Events

► TJvComboListBox Methods

[+] TJvComboListBox Methods

► TJvComboListBox Properties

[+] TJvComboListBox Properties

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Summary

Occurs when the user tries to open the drop-down list by clicking the arrow at the right of the control.

Pascal

 TJvComboListDropDownEvent = procedure (Sender: TObject; Index: Integer; X, Y: Integer; var AllowDrop: Boolean) ofobject;
propertyOnDropDown: TJvComboListDropDownEvent;

Parameters

Parameters	Description
Y	Vertical pixel coordinates of the mouse pointer in the client area of the Sender.
AllowDrop	Set to true if the drop-down attempt can proceed and false if the attempt to drop-down should be aborted.
X	Horizontal pixel coordinates of the mouse pointer in the client area of the Sender.
Sender	The component that fired the event.
Index	The index of the item in the Items list.

Description

Write an OnDropDown event handler to conditionally prevent opening of a drop-down list.

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