Merge "Fix single frame flicker for views reacting to keyboard insets." into udc-dev

import java.util.List;

/**

 * Callback that animates views above the IME

 * Callback that animates views above the IME.

 * <p>

 * The expected stages of a keyboard transition are:

 * <p>

 * <ul>

 *   <li>PREPARING: Keyboard insets haven't changed yet, but are about to.</li>

 *   <li>STARTED: Keyboard insets have temporarily changed to the end state, but not drawn.</li>

 *   <li>PROGRESSING: At least one frame of the animation has been drawn.</li>

 *   <li>FINISHED: Keyboard has reached its end state, and animation is complete.</li>

 * </ul>

 */

@RequiresApi(api = Build.VERSION_CODES.R)

public class KeyboardInsetAnimationCallback extends WindowInsetsAnimation.Callback {

        mInitialTranslation = mView.getTranslationY();

    }

    @Override

    public WindowInsetsAnimation.Bounds onStart(WindowInsetsAnimation animation,

            WindowInsetsAnimation.Bounds bounds) {

        // Final insets have temporarily been applied, so store the current translation as final.

        mTerminalTranslation = mView.getTranslationY();

        // Reset the translation in case the view is drawn before onProgress gets called.

        mView.setTranslationY(mInitialTranslation);

        if (mView instanceof KeyboardInsetListener) {

            ((KeyboardInsetListener) mView).onTranslationStart();

        }

        return super.onStart(animation, bounds);

    }

    @Override

    public WindowInsets onProgress(WindowInsets windowInsets, List<WindowInsetsAnimation> list) {

        return windowInsets;

    }

    @Override

    public WindowInsetsAnimation.Bounds onStart(WindowInsetsAnimation animation,

            WindowInsetsAnimation.Bounds bounds) {

        mTerminalTranslation = mView.getTranslationY();

        if (mView instanceof KeyboardInsetListener) {

            ((KeyboardInsetListener) mView).onTranslationStart();

        }

        return super.onStart(animation, bounds);

    }

    @Override

    public void onEnd(WindowInsetsAnimation animation) {

        mView.setTranslationY(mTerminalTranslation);

        if (mView instanceof KeyboardInsetListener) {

            ((KeyboardInsetListener) mView).onTranslationEnd();

        }