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Vcl.Controls.TControl.VisibleChanging

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Delphi

procedure VisibleChanging; dynamic;

C++

DYNAMIC void __fastcall VisibleChanging();

Properties

Type Visibility Source Unit Parent
procedure
function
protected
Vcl.Controls.pas
Vcl.Controls.hpp
Vcl.Controls TControl

Description

Provides the interface for a method that responds to changes in the control's visibility.

VisibleChanging is called before the value of a control's Visible property changes. As implemented in TControl, it does nothing. Override VisibleChanging to respond to changes in the control's visibility. For example, if a control should not change its visibility, override VisibleChanging to raise an exception when an attempt is made to alter the control's visibility.

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