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/*
* Copyright (C) 2021 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.android.launcher3.anim;
import android.os.Build;
import android.view.View;
import android.view.WindowInsets;
import android.view.WindowInsetsAnimation;
import androidx.annotation.RequiresApi;
import com.android.launcher3.Utilities;
import java.util.List;
/**
* 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 {
private final View mView;
private float mInitialTranslation;
private float mTerminalTranslation;
private KeyboardTranslationState mKeyboardTranslationState = KeyboardTranslationState.SYSTEM;
/** Current state of the keyboard. */
public enum KeyboardTranslationState {
// We are not controlling the keyboard, and it may or may not be translating.
SYSTEM,
// We are about to gain control of the keyboard, but the current state may be transient.
MANUAL_PREPARED,
// We are manually translating the keyboard.
MANUAL_ONGOING
}
public KeyboardInsetAnimationCallback(View view) {
super(DISPATCH_MODE_STOP);
mView = view;
}
public KeyboardTranslationState getKeyboardTranslationState() {
return mKeyboardTranslationState;
}
@Override
public void onPrepare(WindowInsetsAnimation animation) {
mKeyboardTranslationState = KeyboardTranslationState.MANUAL_PREPARED;
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);
mKeyboardTranslationState = KeyboardTranslationState.MANUAL_ONGOING;
if (mView instanceof KeyboardInsetListener) {
((KeyboardInsetListener) mView).onTranslationStart();
}
return super.onStart(animation, bounds);
}
@Override
public WindowInsets onProgress(WindowInsets windowInsets, List<WindowInsetsAnimation> list) {
if (list.size() == 0) {
mView.setTranslationY(mInitialTranslation);
return windowInsets;
}
WindowInsetsAnimation animation = list.get(0);
if (animation.getDurationMillis() > -1) {
float progress = animation.getInterpolatedFraction();
mView.setTranslationY(
Utilities.mapRange(progress, mInitialTranslation, mTerminalTranslation));
} else {
// Manually controlled animation: Set translation to keyboard height.
int translationY = -windowInsets.getInsets(WindowInsets.Type.ime()).bottom;
if (mView.getParent() instanceof View) {
// Offset any translation of the parent (e.g. All Apps parallax).
translationY -= ((View) mView.getParent()).getTranslationY();
}
mView.setTranslationY(translationY);
}
if (mView instanceof KeyboardInsetListener) {
((KeyboardInsetListener) mView).onKeyboardAlphaChanged(animation.getAlpha());
}
return windowInsets;
}
@Override
public void onEnd(WindowInsetsAnimation animation) {
if (mView instanceof KeyboardInsetListener) {
((KeyboardInsetListener) mView).onTranslationEnd();
}
mKeyboardTranslationState = KeyboardTranslationState.SYSTEM;
}
/**
* Interface Allowing views to listen for keyboard translation events
*/
public interface KeyboardInsetListener {
/**
* Called from {@link KeyboardInsetAnimationCallback#onStart}
*/
void onTranslationStart();
/**
* Called from {@link KeyboardInsetAnimationCallback#onProgress}
*
* @param alpha the current IME alpha
*/
default void onKeyboardAlphaChanged(float alpha) {}
/**
* Called from {@link KeyboardInsetAnimationCallback#onEnd}
*/
void onTranslationEnd();
}
}
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