FloatingActionButtonEclairMr1.java revision 7e82b99953680915596eaf0eb35927388e574ca8 
1/*
2 * Copyright (C) 2015 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17package android.support.design.widget;
18
19import android.content.res.ColorStateList;
20import android.graphics.Color;
21import android.graphics.PorterDuff;
22import android.graphics.Rect;
23import android.graphics.drawable.Drawable;
24import android.graphics.drawable.GradientDrawable;
25import android.graphics.drawable.LayerDrawable;
26import android.support.v4.graphics.drawable.DrawableCompat;
27import android.support.v4.view.animation.FastOutSlowInInterpolator;
28import android.view.View;
29import android.view.animation.Animation;
30import android.view.animation.Interpolator;
31import android.view.animation.Transformation;
32
33class FloatingActionButtonEclairMr1 extends FloatingActionButtonImpl {
34
35    private static final Interpolator INTERPOLATOR = new FastOutSlowInInterpolator();
36
37    private Drawable mShapeDrawable;
38    private Drawable mRippleDrawable;
39
40    private float mElevation;
41    private float mPressedTranslationZ;
42    private int mAnimationDuration;
43
44    private StateListAnimator mStateListAnimator;
45
46    ShadowDrawableWrapper mShadowDrawable;
47
48    FloatingActionButtonEclairMr1(View view, ShadowViewDelegate shadowViewDelegate) {
49        super(view, shadowViewDelegate);
50
51        mAnimationDuration = view.getResources().getInteger(android.R.integer.config_shortAnimTime);
52
53        mStateListAnimator = new StateListAnimator();
54        mStateListAnimator.setTarget(view);
55
56        // Elevate with translationZ when pressed or focused
57        mStateListAnimator.addState(PRESSED_ENABLED_STATE_SET,
58                setupAnimation(new ElevateToTranslationZAnimation()));
59        mStateListAnimator.addState(FOCUSED_ENABLED_STATE_SET,
60                setupAnimation(new ElevateToTranslationZAnimation()));
61        // Reset back to elevation by default
62        mStateListAnimator.addState(EMPTY_STATE_SET,
63                setupAnimation(new ResetElevationAnimation()));
64    }
65
66    @Override
67    void setBackgroundDrawable(Drawable originalBackground, ColorStateList backgroundTint,
68            PorterDuff.Mode backgroundTintMode, int rippleColor) {
69        // First we need to tint the original background with the tint
70        mShapeDrawable = DrawableCompat.wrap(originalBackground);
71        DrawableCompat.setTintList(mShapeDrawable, backgroundTint);
72        if (backgroundTintMode != null) {
73            DrawableCompat.setTintMode(mShapeDrawable, backgroundTintMode);
74        }
75
76        // Now we created a mask Drawable which will be used for touch feedback.
77        // As we don't know the actual outline of mShapeDrawable, we'll just guess that it's a
78        // circle
79        GradientDrawable touchFeedbackShape = new GradientDrawable();
80        touchFeedbackShape.setShape(GradientDrawable.OVAL);
81        touchFeedbackShape.setColor(Color.WHITE);
82        touchFeedbackShape.setCornerRadius(mShadowViewDelegate.getRadius());
83
84        // We'll now wrap that touch feedback mask drawable with a ColorStateList
85        mRippleDrawable = DrawableCompat.wrap(touchFeedbackShape);
86        DrawableCompat.setTintList(mRippleDrawable, createColorStateList(rippleColor));
87        DrawableCompat.setTintMode(mRippleDrawable, PorterDuff.Mode.MULTIPLY);
88
89        mShadowDrawable = new ShadowDrawableWrapper(
90                mView.getResources(),
91                new LayerDrawable(new Drawable[] {mShapeDrawable, mRippleDrawable}),
92                mShadowViewDelegate.getRadius(),
93                mElevation,
94                mElevation + mPressedTranslationZ);
95        mShadowDrawable.setAddPaddingForCorners(false);
96
97        mShadowViewDelegate.setBackgroundDrawable(mShadowDrawable);
98
99        updatePadding();
100    }
101
102    @Override
103    void setBackgroundTintList(ColorStateList tint) {
104        DrawableCompat.setTintList(mShapeDrawable, tint);
105    }
106
107    @Override
108    void setBackgroundTintMode(PorterDuff.Mode tintMode) {
109        DrawableCompat.setTintMode(mShapeDrawable, tintMode);
110    }
111
112    @Override
113    void setRippleColor(int rippleColor) {
114        DrawableCompat.setTint(mRippleDrawable, rippleColor);
115    }
116
117    @Override
118    void setElevation(float elevation) {
119        if (mElevation != elevation && mShadowDrawable != null) {
120            mShadowDrawable.setShadowSize(elevation, elevation + mPressedTranslationZ);
121            mElevation = elevation;
122            updatePadding();
123        }
124    }
125
126    @Override
127    void setPressedTranslationZ(float translationZ) {
128        if (mPressedTranslationZ != translationZ && mShadowDrawable != null) {
129            mPressedTranslationZ = translationZ;
130            mShadowDrawable.setMaxShadowSize(mElevation + translationZ);
131            updatePadding();
132        }
133    }
134
135    @Override
136    void onDrawableStateChanged(int[] state) {
137        mStateListAnimator.setState(state);
138    }
139
140    @Override
141    void jumpDrawableToCurrentState() {
142        mStateListAnimator.jumpToCurrentState();
143    }
144
145    private void updatePadding() {
146        Rect rect = new Rect();
147        mShadowDrawable.getPadding(rect);
148        mShadowViewDelegate.setShadowPadding(rect.left, rect.top, rect.right, rect.bottom);
149    }
150
151    private Animation setupAnimation(Animation animation) {
152        animation.setInterpolator(INTERPOLATOR);
153        animation.setDuration(mAnimationDuration);
154        return animation;
155    }
156
157    private abstract class BaseShadowAnimation extends Animation {
158        private float mShadowSizeStart;
159        private float mShadowSizeDiff;
160
161        @Override
162        public void reset() {
163            super.reset();
164
165            mShadowSizeStart = mShadowDrawable.getShadowSize();
166            mShadowSizeDiff = getTargetShadowSize() - mShadowSizeStart;
167        }
168
169        @Override
170        protected void applyTransformation(float interpolatedTime, Transformation t) {
171            mShadowDrawable.setShadowSize(mShadowSizeStart + (mShadowSizeDiff * interpolatedTime));
172        }
173
174        /**
175         * @return the shadow size we want to animate to.
176         */
177        protected abstract float getTargetShadowSize();
178    }
179
180    private class ResetElevationAnimation extends BaseShadowAnimation {
181        @Override
182        protected float getTargetShadowSize() {
183            return mElevation;
184        }
185    }
186
187    private class ElevateToTranslationZAnimation extends BaseShadowAnimation {
188        @Override
189        protected float getTargetShadowSize() {
190            return mElevation + mPressedTranslationZ;
191        }
192    }
193
194    private static ColorStateList createColorStateList(int selectedColor) {
195        final int[][] states = new int[3][];
196        final int[] colors = new int[3];
197        int i = 0;
198
199        states[i] = FOCUSED_ENABLED_STATE_SET;
200        colors[i] = selectedColor;
201        i++;
202
203        states[i] = PRESSED_ENABLED_STATE_SET;
204        colors[i] = selectedColor;
205        i++;
206
207        // Default enabled state
208        states[i] = new int[0];
209        colors[i] = Color.TRANSPARENT;
210        i++;
211
212        return new ColorStateList(states, colors);
213    }
214}