material-components_material-components-android/lib/gingerbread/android/support/design/widget/FloatingActionButtonGingerbread.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.animation.ValueAnimator;
import android.content.res.ColorStateList;
import android.graphics.Color;
import android.graphics.PorterDuff;
import android.graphics.Rect;
import android.graphics.drawable.Drawable;
import android.graphics.drawable.GradientDrawable;
import android.graphics.drawable.LayerDrawable;
import android.support.annotation.NonNull;
import android.support.annotation.Nullable;
import android.support.design.R;
import android.support.design.widget.AnimationUtils.AnimationListenerAdapter;
import android.support.v4.graphics.drawable.DrawableCompat;
import android.view.View;
import android.view.animation.Animation;

class FloatingActionButtonGingerbread extends FloatingActionButtonImpl {

  private final StateListAnimator mStateListAnimator;

  ShadowDrawableWrapper mShadowDrawable;

  FloatingActionButtonGingerbread(
      VisibilityAwareImageButton view, ShadowViewDelegate shadowViewDelegate) {
    super(view, shadowViewDelegate);

    mStateListAnimator = new StateListAnimator();

    // Elevate with translationZ when pressed or focused
    mStateListAnimator.addState(
        PRESSED_ENABLED_STATE_SET, createAnimator(new ElevateToTranslationZAnimation()));
    mStateListAnimator.addState(
        FOCUSED_ENABLED_STATE_SET, createAnimator(new ElevateToTranslationZAnimation()));
    // Reset back to elevation by default
    mStateListAnimator.addState(ENABLED_STATE_SET, createAnimator(new ResetElevationAnimation()));
    // Set to 0 when disabled
    mStateListAnimator.addState(EMPTY_STATE_SET, createAnimator(new DisabledElevationAnimation()));
  }

  @Override
  void setBackgroundDrawable(
      ColorStateList backgroundTint,
      PorterDuff.Mode backgroundTintMode,
      int rippleColor,
      int borderWidth) {
    // Now we need to tint the original background with the tint, using
    // an InsetDrawable if we have a border width
    mShapeDrawable = DrawableCompat.wrap(createShapeDrawable());
    DrawableCompat.setTintList(mShapeDrawable, backgroundTint);
    if (backgroundTintMode != null) {
      DrawableCompat.setTintMode(mShapeDrawable, backgroundTintMode);
    }

    // Now we created a mask Drawable which will be used for touch feedback.
    GradientDrawable touchFeedbackShape = createShapeDrawable();

    // We'll now wrap that touch feedback mask drawable with a ColorStateList. We do not need
    // to inset for any border here as LayerDrawable will nest the padding for us
    mRippleDrawable = DrawableCompat.wrap(touchFeedbackShape);
    DrawableCompat.setTintList(mRippleDrawable, createColorStateList(rippleColor));

    final Drawable[] layers;
    if (borderWidth > 0) {
      mBorderDrawable = createBorderDrawable(borderWidth, backgroundTint);
      layers = new Drawable[] {mBorderDrawable, mShapeDrawable, mRippleDrawable};
    } else {
      mBorderDrawable = null;
      layers = new Drawable[] {mShapeDrawable, mRippleDrawable};
    }

    mContentBackground = new LayerDrawable(layers);

    mShadowDrawable =
        new ShadowDrawableWrapper(
            mView.getContext(),
            mContentBackground,
            mShadowViewDelegate.getRadius(),
            mElevation,
            mElevation + mPressedTranslationZ);
    mShadowDrawable.setAddPaddingForCorners(false);
    mShadowViewDelegate.setBackgroundDrawable(mShadowDrawable);
  }

  @Override
  void setBackgroundTintList(ColorStateList tint) {
    if (mShapeDrawable != null) {
      DrawableCompat.setTintList(mShapeDrawable, tint);
    }
    if (mBorderDrawable != null) {
      mBorderDrawable.setBorderTint(tint);
    }
  }

  @Override
  void setBackgroundTintMode(PorterDuff.Mode tintMode) {
    if (mShapeDrawable != null) {
      DrawableCompat.setTintMode(mShapeDrawable, tintMode);
    }
  }

  @Override
  void setRippleColor(int rippleColor) {
    if (mRippleDrawable != null) {
      DrawableCompat.setTintList(mRippleDrawable, createColorStateList(rippleColor));
    }
  }

  @Override
  float getElevation() {
    return mElevation;
  }

  @Override
  void onElevationsChanged(float elevation, float pressedTranslationZ) {
    if (mShadowDrawable != null) {
      mShadowDrawable.setShadowSize(elevation, elevation + mPressedTranslationZ);
      updatePadding();
    }
  }

  @Override
  void onDrawableStateChanged(int[] state) {
    mStateListAnimator.setState(state);
  }

  @Override
  void jumpDrawableToCurrentState() {
    mStateListAnimator.jumpToCurrentState();
  }

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

    mAnimState = ANIM_STATE_HIDING;

    Animation anim =
        android.view.animation.AnimationUtils.loadAnimation(
            mView.getContext(), R.anim.design_fab_out);
    anim.setInterpolator(AnimationUtils.FAST_OUT_LINEAR_IN_INTERPOLATOR);
    anim.setDuration(SHOW_HIDE_ANIM_DURATION);
    anim.setAnimationListener(
        new AnimationUtils.AnimationListenerAdapter() {
          @Override
          public void onAnimationEnd(Animation animation) {
            mAnimState = ANIM_STATE_NONE;
            mView.internalSetVisibility(fromUser ? View.GONE : View.INVISIBLE, fromUser);
            if (listener != null) {
              listener.onHidden();
            }
          }
        });
    mView.startAnimation(anim);
  }

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

    mAnimState = ANIM_STATE_SHOWING;

    mView.internalSetVisibility(View.VISIBLE, fromUser);
    Animation anim =
        android.view.animation.AnimationUtils.loadAnimation(
            mView.getContext(), R.anim.design_fab_in);
    anim.setDuration(SHOW_HIDE_ANIM_DURATION);
    anim.setInterpolator(AnimationUtils.LINEAR_OUT_SLOW_IN_INTERPOLATOR);
    anim.setAnimationListener(
        new AnimationListenerAdapter() {
          @Override
          public void onAnimationEnd(Animation animation) {
            mAnimState = ANIM_STATE_NONE;
            if (listener != null) {
              listener.onShown();
            }
          }
        });
    mView.startAnimation(anim);
  }

  @Override
  void onCompatShadowChanged() {
    // Ignore pre-v21
  }

  @Override
  void getPadding(Rect rect) {
    mShadowDrawable.getPadding(rect);
  }

  private ValueAnimator createAnimator(@NonNull ShadowAnimatorImpl impl) {
    final ValueAnimator animator = new ValueAnimator();
    animator.setInterpolator(ANIM_INTERPOLATOR);
    animator.setDuration(PRESSED_ANIM_DURATION);
    animator.addListener(impl);
    animator.addUpdateListener(impl);
    animator.setFloatValues(0, 1);
    return animator;
  }

  private abstract class ShadowAnimatorImpl extends AnimatorListenerAdapter
      implements ValueAnimator.AnimatorUpdateListener {
    private boolean mValidValues;
    private float mShadowSizeStart;
    private float mShadowSizeEnd;

    @Override
    public void onAnimationUpdate(ValueAnimator animator) {
      if (!mValidValues) {
        mShadowSizeStart = mShadowDrawable.getShadowSize();
        mShadowSizeEnd = getTargetShadowSize();
        mValidValues = true;
      }

      mShadowDrawable.setShadowSize(
          mShadowSizeStart
              + ((mShadowSizeEnd - mShadowSizeStart) * animator.getAnimatedFraction()));
    }

    @Override
    public void onAnimationEnd(Animator animator) {
      mShadowDrawable.setShadowSize(mShadowSizeEnd);
      mValidValues = false;
    }

    /** @return the shadow size we want to animate to. */
    protected abstract float getTargetShadowSize();
  }

  private class ResetElevationAnimation extends ShadowAnimatorImpl {
    ResetElevationAnimation() {}

    @Override
    protected float getTargetShadowSize() {
      return mElevation;
    }
  }

  private class ElevateToTranslationZAnimation extends ShadowAnimatorImpl {
    ElevateToTranslationZAnimation() {}

    @Override
    protected float getTargetShadowSize() {
      return mElevation + mPressedTranslationZ;
    }
  }

  private class DisabledElevationAnimation extends ShadowAnimatorImpl {
    DisabledElevationAnimation() {}

    @Override
    protected float getTargetShadowSize() {
      return 0f;
    }
  }

  private static ColorStateList createColorStateList(int selectedColor) {
    final int[][] states = new int[3][];
    final int[] colors = new int[3];
    int i = 0;

    states[i] = FOCUSED_ENABLED_STATE_SET;
    colors[i] = selectedColor;
    i++;

    states[i] = PRESSED_ENABLED_STATE_SET;
    colors[i] = selectedColor;
    i++;

    // Default enabled state
    states[i] = new int[0];
    colors[i] = Color.TRANSPARENT;
    i++;

    return new ColorStateList(states, colors);
  }
}