design/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.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, ValueAnimatorCompat.Creator animatorCreator) {
        super(view, shadowViewDelegate, animatorCreator);

        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.getResources(),
                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(View.GONE, 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 ValueAnimatorCompat createAnimator(@NonNull ShadowAnimatorImpl impl) {
        final ValueAnimatorCompat animator = mAnimatorCreator.createAnimator();
        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 ValueAnimatorCompat.AnimatorListenerAdapter
            implements ValueAnimatorCompat.AnimatorUpdateListener {
        private boolean mValidValues;
        private float mShadowSizeStart;
        private float mShadowSizeEnd;

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

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

        @Override
        public void onAnimationEnd(ValueAnimatorCompat 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);
    }
}