TImageEnView.OnImageChangeEx

Declaration

property OnImageChangeEx: TIEImageChangeEvent;

Description

Occurs after the image is modified using TImageEnProc (Proc property) or TImageEnIO (IO property).
If you are using multiple Layers, then layer changes will also trigger OnImageChangeEx.

Values of ChangeSource:

Value	Description
iecsIO (0)	The content of the image has changed due to loading or other TImageEnIO method
iecsProc (1)	The content of the image has changed due to image editing using TImageEnProc
iecsBitmap (2)	The content of the image has changed for other reasons (e.g. assignment or layer merging)
iecsLayer (3)	Properties of a layer have been changed, e.g. by adding, removing, resizing, moving or setting layer properties
iecsUndo (4)	The content of the image has changed due to Undo or Redo

Note:
◼This event is triggered by editing methods in TImageEnProc or in TImageEnView (e.g. Clear). Not by changes to the IEBitmap
◼OnImageChangeEx is the same as OnImageChangeEx, except that it includes a parameter showing whether the change is due to the image or layers
◼TImageEnProc calls ImageChange after a modification which actuates OnImageChangeEx.

Example

procedure TForm1.ImageEnView1ImageChangeEx(Sender: TObject; ChangeSource: Integer);
begin
  // Update button status only when the image changes (not layers)
  if ChangeSource <> iecsLayers then
    UpdateButtons();
end;

TImageEnView.OnImageChangeEx