material-components_material-components-android/lib/ics/android/support/design/widget/FloatingActionButtonIcs.java

/*
 * Copyright (C) 2015 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 android.support.design.widget;

import android.animation.Animator;
import android.animation.AnimatorListenerAdapter;
import android.os.Build;
import android.support.annotation.Nullable;
import android.support.annotation.RequiresApi;
import android.support.v4.view.ViewCompat;
import android.view.View;

@RequiresApi(14)
class FloatingActionButtonIcs extends FloatingActionButtonGingerbread {

  private float mRotation;

  FloatingActionButtonIcs(VisibilityAwareImageButton view, ShadowViewDelegate shadowViewDelegate) {
    super(view, shadowViewDelegate);
    mRotation = mView.getRotation();
  }

  @Override
  boolean requirePreDrawListener() {
    return true;
  }

  @Override
  void onPreDraw() {
    final float rotation = mView.getRotation();
    if (mRotation != rotation) {
      mRotation = rotation;
      updateFromViewRotation();
    }
  }

  @Override
  void hide(@Nullable final InternalVisibilityChangedListener listener, final boolean fromUser) {
    if (isOrWillBeHidden()) {
      // We either are or will soon be hidden, skip the call
      return;
    }

    mView.animate().cancel();

    if (shouldAnimateVisibilityChange()) {
      mAnimState = ANIM_STATE_HIDING;

      mView
          .animate()
          .scaleX(0f)
          .scaleY(0f)
          .alpha(0f)
          .setDuration(SHOW_HIDE_ANIM_DURATION)
          .setInterpolator(AnimationUtils.FAST_OUT_LINEAR_IN_INTERPOLATOR)
          .setListener(
              new AnimatorListenerAdapter() {
                private boolean mCancelled;

                @Override
                public void onAnimationStart(Animator animation) {
                  mView.internalSetVisibility(View.VISIBLE, fromUser);
                  mCancelled = false;
                }

                @Override
                public void onAnimationCancel(Animator animation) {
                  mCancelled = true;
                }

                @Override
                public void onAnimationEnd(Animator animation) {
                  mAnimState = ANIM_STATE_NONE;

                  if (!mCancelled) {
                    mView.internalSetVisibility(fromUser ? View.GONE : View.INVISIBLE, fromUser);
                    if (listener != null) {
                      listener.onHidden();
                    }
                  }
                }
              });
    } else {
      // If the view isn't laid out, or we're in the editor, don't run the animation
      mView.internalSetVisibility(fromUser ? View.GONE : View.INVISIBLE, fromUser);
      if (listener != null) {
        listener.onHidden();
      }
    }
  }

  @Override
  void show(@Nullable final InternalVisibilityChangedListener listener, final boolean fromUser) {
    if (isOrWillBeShown()) {
      // We either are or will soon be visible, skip the call
      return;
    }

    mView.animate().cancel();

    if (shouldAnimateVisibilityChange()) {
      mAnimState = ANIM_STATE_SHOWING;

      if (mView.getVisibility() != View.VISIBLE) {
        // If the view isn't visible currently, we'll animate it from a single pixel
        mView.setAlpha(0f);
        mView.setScaleY(0f);
        mView.setScaleX(0f);
      }

      mView
          .animate()
          .scaleX(1f)
          .scaleY(1f)
          .alpha(1f)
          .setDuration(SHOW_HIDE_ANIM_DURATION)
          .setInterpolator(AnimationUtils.LINEAR_OUT_SLOW_IN_INTERPOLATOR)
          .setListener(
              new AnimatorListenerAdapter() {
                @Override
                public void onAnimationStart(Animator animation) {
                  mView.internalSetVisibility(View.VISIBLE, fromUser);
                }

                @Override
                public void onAnimationEnd(Animator animation) {
                  mAnimState = ANIM_STATE_NONE;
                  if (listener != null) {
                    listener.onShown();
                  }
                }
              });
    } else {
      mView.internalSetVisibility(View.VISIBLE, fromUser);
      mView.setAlpha(1f);
      mView.setScaleY(1f);
      mView.setScaleX(1f);
      if (listener != null) {
        listener.onShown();
      }
    }
  }

  private boolean shouldAnimateVisibilityChange() {
    return ViewCompat.isLaidOut(mView) && !mView.isInEditMode();
  }

  private void updateFromViewRotation() {
    if (Build.VERSION.SDK_INT == 19) {
      // KitKat seems to have an issue with views which are rotated with angles which are
      // not divisible by 90. Worked around by moving to software rendering in these cases.
      if ((mRotation % 90) != 0) {
        if (mView.getLayerType() != View.LAYER_TYPE_SOFTWARE) {
          mView.setLayerType(View.LAYER_TYPE_SOFTWARE, null);
        }
      } else {
        if (mView.getLayerType() != View.LAYER_TYPE_NONE) {
          mView.setLayerType(View.LAYER_TYPE_NONE, null);
        }
      }
    }

    // Offset any View rotation
    if (mShadowDrawable != null) {
      mShadowDrawable.setRotation(-mRotation);
    }
    if (mBorderDrawable != null) {
      mBorderDrawable.setRotation(-mRotation);
    }
  }
}