SearchOrbView.java revision 937f910ceb3364a1b84899c2b5f1ff5384f38f84 
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.TypedArray;
23import android.graphics.Color;
24import android.graphics.Rect;
25import android.graphics.drawable.Drawable;
26import android.graphics.drawable.GradientDrawable;
27import android.support.v17.leanback.R;
28import android.util.AttributeSet;
29import android.view.LayoutInflater;
30import android.view.View;
31import android.widget.FrameLayout;
32import android.widget.ImageView;
33
34/**
35 * <p>A widget that draws a search affordance, represented by a round background and an icon.</p>
36 *
37 * Background color and icon can be customized
38 */
39public class SearchOrbView extends FrameLayout implements View.OnClickListener {
40    private OnClickListener mListener;
41    private View mSearchOrbView;
42    private ImageView mIcon;
43    private Drawable mIconDrawable;
44    private int mSearchOrbColor, mSearchOrbColorBright;
45    private final float mFocusedZoom;
46    private final float mBrightnessAlpha;
47    private final int mPulseDurationMs;
48    private final int mScaleDownDurationMs;
49    private ValueAnimator mColorAnimator;
50
51    private final ArgbEvaluator mColorEvaluator = new ArgbEvaluator();
52
53    private final ValueAnimator.AnimatorUpdateListener mUpdateListener =
54            new ValueAnimator.AnimatorUpdateListener() {
55        @Override
56        public void onAnimationUpdate(ValueAnimator animator) {
57            Integer color = (Integer) animator.getAnimatedValue();
58            setOrbViewColor(color.intValue());
59        }
60    };
61
62    public SearchOrbView(Context context) {
63        this(context, null);
64    }
65
66    public SearchOrbView(Context context, AttributeSet attrs) {
67        this(context, attrs, R.attr.searchOrbViewStyle);
68    }
69
70    public SearchOrbView(Context context, AttributeSet attrs, int defStyleAttr) {
71        super(context, attrs, defStyleAttr);
72
73        LayoutInflater inflater = (LayoutInflater) context
74                .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
75        View root = inflater.inflate(R.layout.lb_search_orb, this, true);
76        mSearchOrbView = root.findViewById(R.id.search_orb);
77        mIcon = (ImageView)root.findViewById(R.id.icon);
78
79        mFocusedZoom = context.getResources().getFraction(
80                R.fraction.lb_search_orb_focused_zoom, 1, 1);
81        mBrightnessAlpha = context.getResources().getFraction(
82                R.fraction.lb_search_orb_brightness_alpha, 1, 1);
83        mPulseDurationMs = context.getResources().getInteger(
84                R.integer.lb_search_orb_pulse_duration_ms);
85        mScaleDownDurationMs = context.getResources().getInteger(
86                R.integer.lb_search_orb_scale_down_duration_ms);
87
88        TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.lbSearchOrbView,
89                defStyleAttr, 0);
90        Drawable img = a.getDrawable(R.styleable.lbSearchOrbView_searchOrbIcon);
91        setOrbIcon(img);
92
93        int color = a.getColor(R.styleable.lbSearchOrbView_searchOrbColor, 0);
94        setOrbColor(color);
95        a.recycle();
96
97        setFocusable(true);
98        setClipChildren(false);
99        setOnClickListener(this);
100    }
101
102    @Override
103    public void onClick(View view) {
104        if (null != mListener) {
105            mListener.onClick(view);
106        }
107    }
108
109    @Override
110    protected void onFocusChanged(boolean gainFocus, int direction, Rect previouslyFocusedRect) {
111        super.onFocusChanged(gainFocus, direction, previouslyFocusedRect);
112        final float zoom = gainFocus ? mFocusedZoom : 1f;
113        final int duration = gainFocus ? mPulseDurationMs : mScaleDownDurationMs;
114        mSearchOrbView.animate().scaleX(zoom).scaleY(zoom).setDuration(duration).start();
115        enableOrbColorAnimation(gainFocus);
116    }
117
118    /**
119     * Set the orb icon
120     * @param icon the drawable to be used as the icon
121     */
122    public void setOrbIcon(Drawable icon) {
123        mIconDrawable = icon;
124        mIcon.setImageDrawable(mIconDrawable);
125    }
126
127    /**
128     * Returns the orb icon
129     * @return the drawable used as the icon
130     */
131    public Drawable getOrbIcon() {
132        return mIconDrawable;
133    }
134
135    /**
136     * Set the on click listener for the orb
137     * @param listener The listener.
138     */
139    public void setOnOrbClickedListener(OnClickListener listener) {
140        mListener = listener;
141        if (null != listener) {
142            setVisibility(View.VISIBLE);
143        } else {
144            setVisibility(View.INVISIBLE);
145        }
146    }
147
148    /**
149     * Set the background color of the search orb.
150     * @param color the RGBA color
151     */
152    public void setOrbColor(int color) {
153        mSearchOrbColor = color;
154        mSearchOrbColorBright = getBrightColor(color);
155
156        if (mColorAnimator == null) {
157            setOrbViewColor(color);
158        } else {
159            enableOrbColorAnimation(true);
160        }
161    }
162
163    /**
164     * Returns the orb color
165     * @return the RGBA color
166     */
167    public int getOrbColor() {
168        return mSearchOrbColor;
169    }
170
171    private int getBrightColor(int color) {
172        final float brightnessValue = 0xff * mBrightnessAlpha;
173        int red = (int)(Color.red(color) * (1 - mBrightnessAlpha) + brightnessValue);
174        int green = (int)(Color.green(color) * (1 - mBrightnessAlpha) + brightnessValue);
175        int blue = (int)(Color.blue(color) * (1 - mBrightnessAlpha) + brightnessValue);
176        int alpha = (int)(Color.alpha(color) * (1 - mBrightnessAlpha) + brightnessValue);
177        return Color.argb(alpha, red, green, blue);
178    }
179
180    private void enableOrbColorAnimation(boolean enable) {
181        if (mColorAnimator != null) {
182            mColorAnimator.end();
183            mColorAnimator = null;
184        }
185        if (enable) {
186            // TODO: set interpolator (material if available)
187            mColorAnimator = ValueAnimator.ofObject(mColorEvaluator,
188                    mSearchOrbColor, mSearchOrbColorBright, mSearchOrbColor);
189            mColorAnimator.setRepeatCount(ValueAnimator.INFINITE);
190            mColorAnimator.setDuration(mPulseDurationMs * 2);
191            mColorAnimator.addUpdateListener(mUpdateListener);
192            mColorAnimator.start();
193        }
194    }
195
196    private void setOrbViewColor(int color) {
197        if (mSearchOrbView.getBackground() instanceof GradientDrawable) {
198            ((GradientDrawable) mSearchOrbView.getBackground()).setColor(color);
199        }
200    }
201
202}
203