FMX.StdCtrls.TCustomTrack.OnTracking

Delphi

property OnTracking: TNotifyEvent read FOnTracking write FOnTracking;

C++

__property System::Classes::TNotifyEvent OnTracking = {read=FOnTracking, write=FOnTracking};

Type	Visibility	Source	Unit	Parent
event	public	FMX.StdCtrls.pas FMX.StdCtrls.hpp	FMX.StdCtrls	TCustomTrack

Description

Occurs immediately after the position of the slider of this track bar changes.

Write an OnTracking event handler to provide additional functionality when changing the position of the slider of this track bar component.

The OnTracking is very similar to OnChange. The following table shows the difference in the behavior of these events in certain scenarios:

Tracking	Scenario	Behaviour	Events fired	IsTracking
`True` or `False`	Press an arrow key on the keyboard.	The Thumb moves for one "step".	OnTracking OnChange	`False`
`True`	Click on the Thumb of the track bar and move the Thumb.	The Thumb moves as much as you move it.	For each "step" of the movement: OnTracking OnChange	`True`
`False`	Click on the Thumb of the track bar and move the Thumb.	The Thumb moves as much as you move it.	For each step of the movement: OnTracking After you release the Thumb OnChange	`True`
`True`	Click anywhere on the track bar (excluding the Thumb).	The Thumb moves for one "step".	OnTracking OnChange	`False`
`False`	Click anywhere on the track bar (excluding the Thumb).	The Thumb moves to the position where you click.	OnTracking OnChange	`False`
`True` or `False`	Hold the `Shift` button and click anywhere on the track bar (excluding the Thumb).	The Thumb moves to the position where you click.	OnTracking OnChange	`False`