TMeasureItemEvent procedure type
Specifies an event handler used to get the Height for a single item in an owner-drawn list box or combo-box.
Declaration
TMeasureItemEvent = procedure(Control: TWinControl; Index: Integer;
var AHeight: Integer) of objectArguments
Control | The list box or combo-box control. |
Index | Index of the list item to measure. |
AHeight | Height of the list item in pixels. |
Description
TMeasureItemEvent is an object procedure type which specifies an
event handler signalled to get the height for a single item in an owner-drawn
list box or combo-box control. Arguments passed to the handler include the
control for the event notification, the index position for the item measured
in the handler, and the derived height for the item.
TMeasureItemEvent is the type used for the OnMeasureItem property
in TCustomComboBox and TCustomListBox. An application
must implement and assign a procedure using the signature for the handler to
respond to the event notification. The handler should account for variable
height items when enabled in settings for the control.
See also
An experiment, built from development snapshots. Not the official Free Pascal or Lazarus documentation.