Return to default rotation after rotation

[alashow]

How can i return view to default rotation state with animation, after rotating with fingers? Now when i rotate view with fingers it stays in rotated state.

Like in the video:
https://youtu.be/Jh-OJjtHJmQ

[alexvasilkov]

There is no out of the box support for such feature, but I will consider adding it into the library.

For now you may try next code:

    gestureView.setOnTouchListener(new View.OnTouchListener() {
        @Override
        public boolean onTouch(View v, MotionEvent event) {
            if (event.getActionMasked() == MotionEvent.ACTION_UP) {
                gestureView.onTouchEvent(event); // Ensure we passed event to gesture view

                State state = gestureView.getController().getState();
                float rotation = Math.round(state.getRotation() / 90f) * 90f;

                if (!State.equals(rotation, state.getRotation())) {
                    State end = new State();
                    end.set(state.getX(), state.getY(), state.getZoom(), rotation);

                    gestureView.getController().getStateController().restrictStateBounds(end);
                    gestureView.getController().animateStateTo(end);
                }
                return true;
            } else {
                return false;
            }
        }
    });

Note, that restrictStateBounds(end) is not a public method, so you have to call it with reflection.

[alashow]

Reflection didn't work before v2.1.0. Now works. Thanks 😃

State end = new State();
end.set(state.getX(), state.getY(), state.getZoom(), rotation);

StateController stateController = holder.image.getController().getStateController();
try {
    Method method = StateController.class.getMethod("restrictStateBounds", State.class);
    method.invoke(stateController, end);
} catch (Exception e) {
    e.printStackTrace();
}

[alexvasilkov]

Hm, strange, this method was there almost from the beginning.
BTW, now you should not need to call restrictStateBounds(end) with reflection, state restrictions should be applied automatically inside animateStateTo(end).

[alashow]

My bad. I didn't see logs, NoSuchMethodException were throwing. Yeah, it works now because you updated animateStateTo(end), i think.

[alexvasilkov]

In new version 2.1.1 I added setRestrictRotation option in Settings which should do exactly what you want. Please check if works fine for you.

[alashow]

Yes, thanks a lot!

btw, when are you planning to make "Allow scroll up/down gestures to close full image mode.", from TODO?

[alexvasilkov]

I'm not sure, I think it may take several months. It is an interesting feature, but it's hard to find a nice solution and I don't have enough time right now.

[alashow]

@alexvasilkov https://github.com/DrKLO/Telegram/blob/master/TMessagesProj/src/main/java/org/telegram/ui/PhotoViewer.java telegram-s photoviewer is awesome. maybe you will find some solution from it. His code hard to understand, but it works.

[alexvasilkov]

Yeah, I looked it a bit, but it is a complete mess. Anyway I have different implementation which requires different logic.