FloatingActionButtonEclairMr1.java revision cd78954a2b32d9c22686f12c194fac7e49566cf6 
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.InsetDrawable;
26import android.graphics.drawable.LayerDrawable;
27import android.support.v4.graphics.drawable.DrawableCompat;
28import android.view.View;
29import android.view.animation.Animation;
30import android.view.animation.Transformation;
31
32class FloatingActionButtonEclairMr1 extends FloatingActionButtonImpl {
33
34    private Drawable mShapeDrawable;
35    private Drawable mRippleDrawable;
36    private Drawable mBorderDrawable;
37
38    private float mElevation;
39    private float mPressedTranslationZ;
40    private int mAnimationDuration;
41
42    private StateListAnimator mStateListAnimator;
43
44    ShadowDrawableWrapper mShadowDrawable;
45
46    FloatingActionButtonEclairMr1(View view, ShadowViewDelegate shadowViewDelegate) {
47        super(view, shadowViewDelegate);
48
49        mAnimationDuration = view.getResources().getInteger(android.R.integer.config_shortAnimTime);
50
51        mStateListAnimator = new StateListAnimator();
52        mStateListAnimator.setTarget(view);
53
54        // Elevate with translationZ when pressed or focused
55        mStateListAnimator.addState(PRESSED_ENABLED_STATE_SET,
56                setupAnimation(new ElevateToTranslationZAnimation()));
57        mStateListAnimator.addState(FOCUSED_ENABLED_STATE_SET,
58                setupAnimation(new ElevateToTranslationZAnimation()));
59        // Reset back to elevation by default
60        mStateListAnimator.addState(EMPTY_STATE_SET,
61                setupAnimation(new ResetElevationAnimation()));
62    }
63
64    @Override
65    void setBackgroundDrawable(Drawable originalBackground, ColorStateList backgroundTint,
66            PorterDuff.Mode backgroundTintMode, int rippleColor, int borderWidth) {
67        // Now we need to tint the original background with the tint, using
68        // an InsetDrawable if we have a border width
69        mShapeDrawable = DrawableCompat.wrap(borderWidth > 0
70                ? new InsetDrawable(originalBackground, borderWidth)
71                : originalBackground);
72        DrawableCompat.setTintList(mShapeDrawable, backgroundTint);
73        if (backgroundTintMode != null) {
74            DrawableCompat.setTintMode(mShapeDrawable, backgroundTintMode);
75        }
76
77        // Now we created a mask Drawable which will be used for touch feedback.
78        // As we don't know the actual outline of mShapeDrawable, we'll just guess that it's a
79        // circle
80        GradientDrawable touchFeedbackShape = new GradientDrawable();
81        touchFeedbackShape.setShape(GradientDrawable.OVAL);
82        touchFeedbackShape.setColor(Color.WHITE);
83        touchFeedbackShape.setCornerRadius(mShadowViewDelegate.getRadius());
84
85        // We'll now wrap that touch feedback mask drawable with a ColorStateList. We do not need
86        // to inset for any border here as LayerDrawable will nest the padding for us
87        mRippleDrawable = DrawableCompat.wrap(touchFeedbackShape);
88        DrawableCompat.setTintList(mRippleDrawable, createColorStateList(rippleColor));
89        DrawableCompat.setTintMode(mRippleDrawable, PorterDuff.Mode.MULTIPLY);
90
91        final Drawable[] layers;
92        if (borderWidth > 0) {
93            mBorderDrawable = createBorderDrawable(backgroundTint);
94            layers = new Drawable[] {mBorderDrawable, mShapeDrawable, mRippleDrawable};
95        } else {
96            mBorderDrawable = null;
97            layers = new Drawable[] {mShapeDrawable, mRippleDrawable};
98        }
99
100        mShadowDrawable = new ShadowDrawableWrapper(
101                mView.getResources(),
102                new LayerDrawable(layers),
103                mShadowViewDelegate.getRadius(),
104                mElevation,
105                mElevation + mPressedTranslationZ);
106        mShadowDrawable.setAddPaddingForCorners(false);
107
108        mShadowViewDelegate.setBackgroundDrawable(mShadowDrawable);
109
110        updatePadding();
111    }
112
113    @Override
114    void setBackgroundTintList(ColorStateList tint) {
115        DrawableCompat.setTintList(mShapeDrawable, tint);
116        if (mBorderDrawable != null) {
117            DrawableCompat.setTintList(mBorderDrawable, tint);
118        }
119    }
120
121    @Override
122    void setBackgroundTintMode(PorterDuff.Mode tintMode) {
123        DrawableCompat.setTintMode(mShapeDrawable, tintMode);
124    }
125
126    @Override
127    void setRippleColor(int rippleColor) {
128        DrawableCompat.setTint(mRippleDrawable, rippleColor);
129    }
130
131    @Override
132    void setElevation(float elevation) {
133        if (mElevation != elevation && mShadowDrawable != null) {
134            mShadowDrawable.setShadowSize(elevation, elevation + mPressedTranslationZ);
135            mElevation = elevation;
136            updatePadding();
137        }
138    }
139
140    @Override
141    void setPressedTranslationZ(float translationZ) {
142        if (mPressedTranslationZ != translationZ && mShadowDrawable != null) {
143            mPressedTranslationZ = translationZ;
144            mShadowDrawable.setMaxShadowSize(mElevation + translationZ);
145            updatePadding();
146        }
147    }
148
149    @Override
150    void onDrawableStateChanged(int[] state) {
151        mStateListAnimator.setState(state);
152    }
153
154    @Override
155    void jumpDrawableToCurrentState() {
156        mStateListAnimator.jumpToCurrentState();
157    }
158
159    private void updatePadding() {
160        Rect rect = new Rect();
161        mShadowDrawable.getPadding(rect);
162        mShadowViewDelegate.setShadowPadding(rect.left, rect.top, rect.right, rect.bottom);
163    }
164
165    private Animation setupAnimation(Animation animation) {
166        animation.setInterpolator(AnimationUtils.FAST_OUT_SLOW_IN_INTERPOLATOR);
167        animation.setDuration(mAnimationDuration);
168        return animation;
169    }
170
171    private abstract class BaseShadowAnimation extends Animation {
172        private float mShadowSizeStart;
173        private float mShadowSizeDiff;
174
175        @Override
176        public void reset() {
177            super.reset();
178
179            mShadowSizeStart = mShadowDrawable.getShadowSize();
180            mShadowSizeDiff = getTargetShadowSize() - mShadowSizeStart;
181        }
182
183        @Override
184        protected void applyTransformation(float interpolatedTime, Transformation t) {
185            mShadowDrawable.setShadowSize(mShadowSizeStart + (mShadowSizeDiff * interpolatedTime));
186        }
187
188        /**
189         * @return the shadow size we want to animate to.
190         */
191        protected abstract float getTargetShadowSize();
192    }
193
194    private class ResetElevationAnimation extends BaseShadowAnimation {
195        @Override
196        protected float getTargetShadowSize() {
197            return mElevation;
198        }
199    }
200
201    private class ElevateToTranslationZAnimation extends BaseShadowAnimation {
202        @Override
203        protected float getTargetShadowSize() {
204            return mElevation + mPressedTranslationZ;
205        }
206    }
207
208    private static ColorStateList createColorStateList(int selectedColor) {
209        final int[][] states = new int[3][];
210        final int[] colors = new int[3];
211        int i = 0;
212
213        states[i] = FOCUSED_ENABLED_STATE_SET;
214        colors[i] = selectedColor;
215        i++;
216
217        states[i] = PRESSED_ENABLED_STATE_SET;
218        colors[i] = selectedColor;
219        i++;
220
221        // Default enabled state
222        states[i] = new int[0];
223        colors[i] = Color.TRANSPARENT;
224        i++;
225
226        return new ColorStateList(states, colors);
227    }
228}