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.ObjectAnimator;
import android.animation.StateListAnimator;
import android.annotation.TargetApi;
import android.content.res.ColorStateList;
import android.graphics.PorterDuff;
import android.graphics.Rect;
import android.graphics.drawable.Drawable;
import android.graphics.drawable.InsetDrawable;
import android.graphics.drawable.LayerDrawable;
import android.graphics.drawable.RippleDrawable;
import android.os.Build;
import android.support.v4.graphics.drawable.DrawableCompat;
import android.support.v4.view.ViewCompat;
import android.view.animation.AnimationUtils;
import android.view.animation.Interpolator;

@TargetApi(Build.VERSION_CODES.LOLLIPOP)
class FloatingActionButtonLollipop extends FloatingActionButtonIcs {

    private final Interpolator mInterpolator;
    private InsetDrawable mInsetDrawable;

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

        mInterpolator = view.isInEditMode() ? null
                : AnimationUtils.loadInterpolator(mView.getContext(),
                        android.R.interpolator.fast_out_slow_in);
    }

    @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
    public void onElevationChanged(float elevation) {
        mView.setElevation(elevation);
        if (mShadowViewDelegate.isCompatPaddingEnabled()) {
            updatePadding();
        }
    }

    @Override
    void onTranslationZChanged(float translationZ) {
        StateListAnimator stateListAnimator = new StateListAnimator();
        // Animate translationZ to our value when pressed or focused
        stateListAnimator.addState(PRESSED_ENABLED_STATE_SET,
                setupAnimator(ObjectAnimator.ofFloat(mView, "translationZ", translationZ)));
        stateListAnimator.addState(FOCUSED_ENABLED_STATE_SET,
                setupAnimator(ObjectAnimator.ofFloat(mView, "translationZ", translationZ)));
        // Animate translationZ to 0 otherwise
        stateListAnimator.addState(EMPTY_STATE_SET,
                setupAnimator(ObjectAnimator.ofFloat(mView, "translationZ", 0f)));
        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;
    }

    private Animator setupAnimator(Animator animator) {
        animator.setInterpolator(mInterpolator);
        return animator;
    }

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

    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);
        }
    }
}