SearchOrbView.java revision 69e74bd8956577d9a3414b81ec661fd5fee42e19 
1/*
2 * Copyright (C) 2014 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.v17.leanback.widget;
18
19import android.animation.ArgbEvaluator;
20import android.animation.ValueAnimator;
21import android.content.Context;
22import android.content.res.Resources;
23import android.content.res.TypedArray;
24import android.graphics.Color;
25import android.graphics.Rect;
26import android.graphics.drawable.Drawable;
27import android.graphics.drawable.GradientDrawable;
28import android.support.v17.leanback.R;
29import android.util.AttributeSet;
30import android.view.LayoutInflater;
31import android.view.View;
32import android.widget.FrameLayout;
33import android.widget.ImageView;
34
35/**
36 * <p>A widget that draws a search affordance, represented by a round background and an icon.</p>
37 *
38 * Background color and icon can be customized
39 */
40public class SearchOrbView extends FrameLayout implements View.OnClickListener {
41    private OnClickListener mListener;
42    private View mSearchOrbView;
43    private ImageView mIcon;
44    private Drawable mIconDrawable;
45    private int mSearchOrbColor, mSearchOrbColorBright;
46    private final float mFocusedZoom;
47    private final float mBrightnessAlpha;
48    private final int mPulseDurationMs;
49    private final int mScaleDownDurationMs;
50    private ValueAnimator mColorAnimator;
51
52    private final ArgbEvaluator mColorEvaluator = new ArgbEvaluator();
53
54    private final ValueAnimator.AnimatorUpdateListener mUpdateListener =
55            new ValueAnimator.AnimatorUpdateListener() {
56        @Override
57        public void onAnimationUpdate(ValueAnimator animator) {
58            Integer color = (Integer) animator.getAnimatedValue();
59            setOrbViewColor(color.intValue());
60        }
61    };
62
63    private ValueAnimator mShadowFocusAnimator;
64
65    private final ValueAnimator.AnimatorUpdateListener mFocusUpdateListener =
66            new ValueAnimator.AnimatorUpdateListener() {
67        @Override
68        public void onAnimationUpdate(ValueAnimator animation) {
69            ShadowHelper.getInstance().setZ(mSearchOrbView, animation.getAnimatedFraction());
70        }
71    };
72
73    public SearchOrbView(Context context) {
74        this(context, null);
75    }
76
77    public SearchOrbView(Context context, AttributeSet attrs) {
78        this(context, attrs, R.attr.searchOrbViewStyle);
79    }
80
81    public SearchOrbView(Context context, AttributeSet attrs, int defStyleAttr) {
82        super(context, attrs, defStyleAttr);
83
84        final Resources res = context.getResources();
85
86        LayoutInflater inflater = (LayoutInflater) context
87                .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
88        View root = inflater.inflate(R.layout.lb_search_orb, this, true);
89        mSearchOrbView = root.findViewById(R.id.search_orb);
90        mIcon = (ImageView)root.findViewById(R.id.icon);
91
92        mFocusedZoom = context.getResources().getFraction(
93                R.fraction.lb_search_orb_focused_zoom, 1, 1);
94        mBrightnessAlpha = context.getResources().getFraction(
95                R.fraction.lb_search_orb_brightness_alpha, 1, 1);
96        mPulseDurationMs = context.getResources().getInteger(
97                R.integer.lb_search_orb_pulse_duration_ms);
98        mScaleDownDurationMs = context.getResources().getInteger(
99                R.integer.lb_search_orb_scale_down_duration_ms);
100
101        TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.lbSearchOrbView,
102                defStyleAttr, 0);
103
104        Drawable img = a.getDrawable(R.styleable.lbSearchOrbView_searchOrbIcon);
105        if (img == null) {
106            img = res.getDrawable(R.drawable.lb_ic_in_app_search);
107        }
108        setOrbIcon(img);
109
110        int defColor = res.getColor(R.color.lb_default_search_color);
111        int color = a.getColor(R.styleable.lbSearchOrbView_searchOrbColor, defColor);
112        int brightColor = a.getColor(
113                R.styleable.lbSearchOrbView_searchOrbBrightColor, getBrightColor(color));
114        setOrbColor(color, brightColor);
115        a.recycle();
116
117        setFocusable(true);
118        setClipChildren(false);
119        setOnClickListener(this);
120
121        ShadowHelper.getInstance().setZ(mSearchOrbView, 0f);
122        // Icon has no background, but must be on top of the search orb view
123        ShadowHelper.getInstance().setZ(mIcon, 1f);
124    }
125
126    @Override
127    public void onClick(View view) {
128        if (null != mListener) {
129            mListener.onClick(view);
130        }
131    }
132
133    private void startShadowFocusAnimation(boolean gainFocus, int duration) {
134        if (mShadowFocusAnimator == null) {
135            mShadowFocusAnimator = ValueAnimator.ofFloat(0f, 1f);
136            mShadowFocusAnimator.addUpdateListener(mFocusUpdateListener);
137        }
138        if (gainFocus) {
139            mShadowFocusAnimator.start();
140        } else {
141            mShadowFocusAnimator.reverse();
142        }
143        mShadowFocusAnimator.setDuration(duration);
144    }
145
146    @Override
147    protected void onFocusChanged(boolean gainFocus, int direction, Rect previouslyFocusedRect) {
148        super.onFocusChanged(gainFocus, direction, previouslyFocusedRect);
149        final float zoom = gainFocus ? mFocusedZoom : 1f;
150        final int duration = gainFocus ? mPulseDurationMs : mScaleDownDurationMs;
151        mSearchOrbView.animate().scaleX(zoom).scaleY(zoom).setDuration(duration).start();
152        startShadowFocusAnimation(gainFocus, duration);
153        enableOrbColorAnimation(gainFocus);
154    }
155
156    /**
157     * Set the orb icon
158     * @param icon the drawable to be used as the icon
159     */
160    public void setOrbIcon(Drawable icon) {
161        mIconDrawable = icon;
162        mIcon.setImageDrawable(mIconDrawable);
163    }
164
165    /**
166     * Returns the orb icon
167     * @return the drawable used as the icon
168     */
169    public Drawable getOrbIcon() {
170        return mIconDrawable;
171    }
172
173    /**
174     * Set the on click listener for the orb
175     * @param listener The listener.
176     */
177    public void setOnOrbClickedListener(OnClickListener listener) {
178        mListener = listener;
179        if (null != listener) {
180            setVisibility(View.VISIBLE);
181        } else {
182            setVisibility(View.INVISIBLE);
183        }
184    }
185
186    /**
187     * Set the background color of the search orb.
188     * @param color the RGBA color
189     */
190    public void setOrbColor(int color) {
191        setOrbColor(color, getBrightColor(color));
192    }
193
194    public void setOrbColor(int color, int brightColor) {
195        mSearchOrbColor = color;
196        mSearchOrbColorBright = brightColor;
197
198        if (mColorAnimator == null) {
199            setOrbViewColor(color);
200        } else {
201            enableOrbColorAnimation(true);
202        }
203    }
204
205    /**
206     * Returns the orb color
207     * @return the RGBA color
208     */
209    public int getOrbColor() {
210        return mSearchOrbColor;
211    }
212
213    private int getBrightColor(int color) {
214        final float brightnessValue = 0xff * mBrightnessAlpha;
215        int red = (int)(Color.red(color) * (1 - mBrightnessAlpha) + brightnessValue);
216        int green = (int)(Color.green(color) * (1 - mBrightnessAlpha) + brightnessValue);
217        int blue = (int)(Color.blue(color) * (1 - mBrightnessAlpha) + brightnessValue);
218        int alpha = (int)(Color.alpha(color) * (1 - mBrightnessAlpha) + brightnessValue);
219        return Color.argb(alpha, red, green, blue);
220    }
221
222    private void enableOrbColorAnimation(boolean enable) {
223        if (mColorAnimator != null) {
224            mColorAnimator.end();
225            mColorAnimator = null;
226        }
227        if (enable) {
228            // TODO: set interpolator (material if available)
229            mColorAnimator = ValueAnimator.ofObject(mColorEvaluator,
230                    mSearchOrbColor, mSearchOrbColorBright, mSearchOrbColor);
231            mColorAnimator.setRepeatCount(ValueAnimator.INFINITE);
232            mColorAnimator.setDuration(mPulseDurationMs * 2);
233            mColorAnimator.addUpdateListener(mUpdateListener);
234            mColorAnimator.start();
235        }
236    }
237
238    private void setOrbViewColor(int color) {
239        if (mSearchOrbView.getBackground() instanceof GradientDrawable) {
240            ((GradientDrawable) mSearchOrbView.getBackground()).setColor(color);
241        }
242    }
243
244}
245