[Overview][Constants][Types][Classes][Procedures and functions][Variables][Index] | Reference for unit 'Graphics' (#lcl)

# TCanvas.RegionChanging

RegionChanging - software emulation for call to OnChanging event for Region

## Declaration

Source position: graphics.pp line 1042

`protected procedure TCanvas.RegionChanging(`
`APen: TObject`
`); virtual;`

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