design/lollipop/android/support/design/widget/FloatingActionButtonLollipop.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.AnimatorSet;
import android.animation.ObjectAnimator;
import android.animation.StateListAnimator;
import android.content.res.ColorStateList;
import android.graphics.PorterDuff;
import android.graphics.Rect;
import android.graphics.drawable.Drawable;
import android.graphics.drawable.GradientDrawable;
import android.graphics.drawable.InsetDrawable;
import android.graphics.drawable.LayerDrawable;
import android.graphics.drawable.RippleDrawable;
import android.os.Build;
import android.support.annotation.RequiresApi;
import android.support.v4.graphics.drawable.DrawableCompat;
import android.view.View;

import java.util.ArrayList;
import java.util.List;

@RequiresApi(21)
class FloatingActionButtonLollipop extends FloatingActionButtonImpl {

    private InsetDrawable mInsetDrawable;

    FloatingActionButtonLollipop(VisibilityAwareImageButton view,
            ShadowViewDelegate shadowViewDelegate) {
        super(view, shadowViewDelegate);
    }

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

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

        mRippleDrawable = new RippleDrawable(ColorStateList.valueOf(rippleColor),
                rippleContent, null);

        mContentBackground = mRippleDrawable;

        mShadowViewDelegate.setBackgroundDrawable(mRippleDrawable);
    }

    @Override
    void setRippleColor(int rippleColor) {
        if (mRippleDrawable instanceof RippleDrawable) {
            ((RippleDrawable) mRippleDrawable).setColor(ColorStateList.valueOf(rippleColor));
        } else {
            super.setRippleColor(rippleColor);
        }
    }

    @Override
    void onElevationsChanged(final float elevation, final float pressedTranslationZ) {
        if (Build.VERSION.SDK_INT == 21) {
            // Animations produce NPE in version 21. Bluntly set the values instead (matching the
            // logic in the animations below).
            if (mView.isEnabled()) {
                mView.setElevation(elevation);
                if (mView.isFocused() || mView.isPressed()) {
                    mView.setTranslationZ(pressedTranslationZ);
                } else {
                    mView.setTranslationZ(0);
                }
            } else {
                mView.setElevation(0);
                mView.setTranslationZ(0);
            }
        } else {
            final StateListAnimator stateListAnimator = new StateListAnimator();

            // Animate elevation and translationZ to our values when pressed
            AnimatorSet set = new AnimatorSet();
            set.play(ObjectAnimator.ofFloat(mView, "elevation", elevation).setDuration(0))
                    .with(ObjectAnimator.ofFloat(mView, View.TRANSLATION_Z, pressedTranslationZ)
                            .setDuration(PRESSED_ANIM_DURATION));
            set.setInterpolator(ANIM_INTERPOLATOR);
            stateListAnimator.addState(PRESSED_ENABLED_STATE_SET, set);

            // Same deal for when we're focused
            set = new AnimatorSet();
            set.play(ObjectAnimator.ofFloat(mView, "elevation", elevation).setDuration(0))
                    .with(ObjectAnimator.ofFloat(mView, View.TRANSLATION_Z, pressedTranslationZ)
                            .setDuration(PRESSED_ANIM_DURATION));
            set.setInterpolator(ANIM_INTERPOLATOR);
            stateListAnimator.addState(FOCUSED_ENABLED_STATE_SET, set);

            // Animate translationZ to 0 if not pressed
            set = new AnimatorSet();
            List<Animator> animators = new ArrayList<>();
            animators.add(ObjectAnimator.ofFloat(mView, "elevation", elevation).setDuration(0));
            if (Build.VERSION.SDK_INT >= 22 && Build.VERSION.SDK_INT <= 24) {
                // This is a no-op animation which exists here only for introducing the duration
                // because setting the delay (on the next animation) via "setDelay" or "after"
                // can trigger a NPE between android versions 22 and 24 (due to a framework
                // bug). The issue has been fixed in version 25.
                animators.add(ObjectAnimator.ofFloat(mView, View.TRANSLATION_Z,
                        mView.getTranslationZ()).setDuration(PRESSED_ANIM_DELAY));
            }
            animators.add(ObjectAnimator.ofFloat(mView, View.TRANSLATION_Z, 0f)
                    .setDuration(PRESSED_ANIM_DURATION));
            set.playSequentially(animators.toArray(new ObjectAnimator[0]));
            set.setInterpolator(ANIM_INTERPOLATOR);
            stateListAnimator.addState(ENABLED_STATE_SET, set);

            // Animate everything to 0 when disabled
            set = new AnimatorSet();
            set.play(ObjectAnimator.ofFloat(mView, "elevation", 0f).setDuration(0))
                    .with(ObjectAnimator.ofFloat(mView, View.TRANSLATION_Z, 0f).setDuration(0));
            set.setInterpolator(ANIM_INTERPOLATOR);
            stateListAnimator.addState(EMPTY_STATE_SET, set);

            mView.setStateListAnimator(stateListAnimator);
        }

        if (mShadowViewDelegate.isCompatPaddingEnabled()) {
            updatePadding();
        }
    }

    @Override
    public float getElevation() {
        return mView.getElevation();
    }

    @Override
    void onCompatShadowChanged() {
        updatePadding();
    }

    @Override
    void onPaddingUpdated(Rect padding) {
        if (mShadowViewDelegate.isCompatPaddingEnabled()) {
            mInsetDrawable = new InsetDrawable(mRippleDrawable,
                    padding.left, padding.top, padding.right, padding.bottom);
            mShadowViewDelegate.setBackgroundDrawable(mInsetDrawable);
        } else {
            mShadowViewDelegate.setBackgroundDrawable(mRippleDrawable);
        }
    }

    @Override
    void onDrawableStateChanged(int[] state) {
        // no-op
    }

    @Override
    void jumpDrawableToCurrentState() {
        // no-op
    }

    @Override
    boolean requirePreDrawListener() {
        return false;
    }

    @Override
    CircularBorderDrawable newCircularDrawable() {
        return new CircularBorderDrawableLollipop();
    }

    @Override
    GradientDrawable newGradientDrawableForShape() {
        return new AlwaysStatefulGradientDrawable();
    }

    @Override
    void getPadding(Rect rect) {
        if (mShadowViewDelegate.isCompatPaddingEnabled()) {
            final float radius = mShadowViewDelegate.getRadius();
            final float maxShadowSize = getElevation() + mPressedTranslationZ;
            final int hPadding = (int) Math.ceil(
                    ShadowDrawableWrapper.calculateHorizontalPadding(maxShadowSize, radius, false));
            final int vPadding = (int) Math.ceil(
                    ShadowDrawableWrapper.calculateVerticalPadding(maxShadowSize, radius, false));
            rect.set(hPadding, vPadding, hPadding, vPadding);
        } else {
            rect.set(0, 0, 0, 0);
        }
    }

    /**
     * LayerDrawable on L+ caches its isStateful() state and doesn't refresh it,
     * meaning that if we apply a tint to one of its children, the parent doesn't become
     * stateful and the tint doesn't work for state changes. We workaround it by saying that we
     * are always stateful. If we don't have a stateful tint, the change is ignored anyway.
     */
    static class AlwaysStatefulGradientDrawable extends GradientDrawable {
        @Override
        public boolean isStateful() {
            return true;
        }
    }
}