content: /*
   * Copyright (C) 2017 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.views;
  
  import static com.android.launcher3.anim.Interpolators.scrollInterpolatorForVelocity;
  
  import android.animation.Animator;
  import android.animation.AnimatorListenerAdapter;
  import android.animation.ObjectAnimator;
  import android.animation.PropertyValuesHolder;
  import android.content.Context;
  import android.util.AttributeSet;
  import android.util.Property;
  import android.view.MotionEvent;
  import android.view.View;
  import android.view.animation.Interpolator;
  
  import com.android.launcher3.AbstractFloatingView;
  import com.android.launcher3.Launcher;
  import com.android.launcher3.Utilities;
  import com.android.launcher3.anim.Interpolators;
  import com.android.launcher3.touch.BaseSwipeDetector;
  import com.android.launcher3.touch.SingleAxisSwipeDetector;
  
  /**
   * Extension of AbstractFloatingView with common methods for sliding in from bottom
   */
  public abstract class AbstractSlideInView extends AbstractFloatingView
          implements SingleAxisSwipeDetector.Listener {
  
      protected static Property<AbstractSlideInView, Float> TRANSLATION_SHIFT =
              new Property<AbstractSlideInView, Float>(Float.class, "translationShift") {
  
                  @Override
                  public Float get(AbstractSlideInView view) {
                      return view.mTranslationShift;
                  }
  
                  @Override
                  public void set(AbstractSlideInView view, Float value) {
                      view.setTranslationShift(value);
                  }
              };
      protected static final float TRANSLATION_SHIFT_CLOSED = 1f;
      protected static final float TRANSLATION_SHIFT_OPENED = 0f;
  
      protected final Launcher mLauncher;
      protected final SingleAxisSwipeDetector mSwipeDetector;
      protected final ObjectAnimator mOpenCloseAnimator;
  
      protected View mContent;
      protected Interpolator mScrollInterpolator;
  
      // range [0, 1], 0=> completely open, 1=> completely closed
      protected float mTranslationShift = TRANSLATION_SHIFT_CLOSED;
  
      protected boolean mNoIntercept;
  
      public AbstractSlideInView(Context context, AttributeSet attrs, int defStyleAttr) {
          super(context, attrs, defStyleAttr);
          mLauncher = Launcher.getLauncher(context);
  
          mScrollInterpolator = Interpolators.SCROLL_CUBIC;
          mSwipeDetector = new SingleAxisSwipeDetector(context, this,
                  SingleAxisSwipeDetector.VERTICAL);
  
          mOpenCloseAnimator = ObjectAnimator.ofPropertyValuesHolder(this);
          mOpenCloseAnimator.addListener(new AnimatorListenerAdapter() {
              @Override
              public void onAnimationEnd(Animator animation) {
                  mSwipeDetector.finishedScrolling();
                  announceAccessibilityChanges();
              }
          });
      }
  
      protected void setTranslationShift(float translationShift) {
          mTranslationShift = translationShift;
          mContent.setTranslationY(mTranslationShift * mContent.getHeight());
      }
  
      @Override
      public boolean onControllerInterceptTouchEvent(MotionEvent ev) {
          if (mNoIntercept) {
              return false;
          }
  
          int directionsToDetectScroll = mSwipeDetector.isIdleState() ?
                  SingleAxisSwipeDetector.DIRECTION_NEGATIVE : 0;
          mSwipeDetector.setDetectableScrollConditions(
                  directionsToDetectScroll, false);
          mSwipeDetector.onTouchEvent(ev);
          return mSwipeDetector.isDraggingOrSettling()
                  || !getPopupContainer().isEventOverView(mContent, ev);
      }
  
      @Override
      public boolean onControllerTouchEvent(MotionEvent ev) {
          mSwipeDetector.onTouchEvent(ev);
          if (ev.getAction() == MotionEvent.ACTION_UP && mSwipeDetector.isIdleState()
                  && !isOpeningAnimationRunning()) {
              // If we got ACTION_UP without ever starting swipe, close the panel.
              if (!getPopupContainer().isEventOverView(mContent, ev)) {
                  close(true);
              }
          }
          return true;
      }
  
      private boolean isOpeningAnimationRunning() {
          return mIsOpen && mOpenCloseAnimator.isRunning();
      }
  
      /* SingleAxisSwipeDetector.Listener */
  
      @Override
      public void onDragStart(boolean start) { }
  
      @Override
      public boolean onDrag(float displacement) {
          float range = mContent.getHeight();
          displacement = Utilities.boundToRange(displacement, 0, range);
          setTranslationShift(displacement / range);
          return true;
      }
  
      @Override
      public void onDragEnd(float velocity) {
          if ((mSwipeDetector.isFling(velocity) && velocity > 0) || mTranslationShift > 0.5f) {
              mScrollInterpolator = scrollInterpolatorForVelocity(velocity);
              mOpenCloseAnimator.setDuration(BaseSwipeDetector.calculateDuration(
                      velocity, TRANSLATION_SHIFT_CLOSED - mTranslationShift));
              close(true);
          } else {
              mOpenCloseAnimator.setValues(PropertyValuesHolder.ofFloat(
                      TRANSLATION_SHIFT, TRANSLATION_SHIFT_OPENED));
              mOpenCloseAnimator.setDuration(
                      BaseSwipeDetector.calculateDuration(velocity, mTranslationShift))
                      .setInterpolator(Interpolators.DEACCEL);
              mOpenCloseAnimator.start();
          }
      }
  
      protected void handleClose(boolean animate, long defaultDuration) {
          if (!mIsOpen) {
              return;
          }
          if (!animate) {
              mOpenCloseAnimator.cancel();
              setTranslationShift(TRANSLATION_SHIFT_CLOSED);
              onCloseComplete();
              return;
          }
          mOpenCloseAnimator.setValues(
                  PropertyValuesHolder.ofFloat(TRANSLATION_SHIFT, TRANSLATION_SHIFT_CLOSED));
          mOpenCloseAnimator.addListener(new AnimatorListenerAdapter() {
              @Override
              public void onAnimationEnd(Animator animation) {
                  onCloseComplete();
              }
          });
          if (mSwipeDetector.isIdleState()) {
              mOpenCloseAnimator
                      .setDuration(defaultDuration)
                      .setInterpolator(Interpolators.ACCEL);
          } else {
              mOpenCloseAnimator.setInterpolator(mScrollInterpolator);
          }
          mOpenCloseAnimator.start();
      }
  
      protected void onCloseComplete() {
          mIsOpen = false;
          getPopupContainer().removeView(this);
      }
  
      protected BaseDragLayer getPopupContainer() {
          return mLauncher.getDragLayer();
      }
  }
  