[How to use] How to save and restore scale and offset adjustments in ExtendedImage?

[codeshong]

Platforms

dart

Description

Hello, Is it possible to save the information about the scale and position(offset) adjustments made by the user before cropping an image? Additionally, is there a way to apply the saved information(scale, offset) when reloading the image later?

I want to display the user's previous edits when they reopen the image for further adjustments.

Thank you in advance.

My code

No response

Try do it

No response

[zmtzawqlp]

you can get current EditActionDetails

extended_image/lib/src/editor/image_editor_controller.dart

Line 106 in 7d1c950

List<EditActionDetails> get history =>

[codeshong]

I'll check that value. Thank you☺️

[jacob-hutchings]

Is there any way to use the saved information when reloading the image later?

[wigojacky]

I could only make it work with below code:

Saving the offset & scale of last edit

final editAction = editorKey.currentState?.editAction;
final screenDestinationRect = editAction?.screenDestinationRect;
double totalScale *= editAction?.totalScale ?? 1;
totalScale = clampScale(totalScale, 0, maxScale);

Retrieving the offset & scale when building the widget, then trigger rebuild

maxScale /= totalScale;
if (screenDestinationRect != null) {
    final editAction = editorKey.currentState?.editAction;
    editAction?.setScreenDestinationRect(screenDestinationRect!);
}
notifyListeners();

And use above code as postframe callback

SchedulerBinding.instance.addPostFrameCallback((_) {
    //Retrieve offset & scale
});

As screenDestinationRect would affect the size of the image, I have to do some math to the totalScale & maxScale to balance for that, keeping the maxScale unchanged.

However, this is not perfect as user would experience a 'jump' from original to the last offset/scale, so see if there is a better solution!