1/*
2 * Copyright (C) 2013 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 com.android.gallery3d.filtershow.colorpicker;
18
19import android.content.Context;
20import android.graphics.Bitmap;
21import android.graphics.BitmapShader;
22import android.graphics.Canvas;
23import android.graphics.Color;
24import android.graphics.LinearGradient;
25import android.graphics.Paint;
26import android.graphics.RadialGradient;
27import android.graphics.Shader;
28import android.util.AttributeSet;
29import android.util.DisplayMetrics;
30import android.view.MotionEvent;
31import android.view.View;
32
33import com.android.gallery3d.R;
34
35import java.util.ArrayList;
36import java.util.Arrays;
37
38public class ColorBrightnessView extends View implements ColorListener {
39
40    private float mRadius;
41    private float mWidth;
42    private Paint mBarPaint1;
43    private Paint mLinePaint1;
44    private Paint mLinePaint2;
45    private Paint mCheckPaint;
46
47    private float mHeight;
48    private Paint mDotPaint;
49    private int mBgcolor = 0;
50
51    private float mDotRadius;
52    private float mBorder;
53
54    private float[] mHSVO = new float[4];
55    private int mSliderColor;
56    private float mDotX = mBorder;
57    private float mDotY = mBorder;
58    private final static float DOT_SIZE = ColorRectView.DOT_SIZE;
59    public final static float BORDER_SIZE = 20;;
60
61    private ArrayList<ColorListener> mColorListeners = new ArrayList<ColorListener>();
62
63    public ColorBrightnessView(Context ctx, AttributeSet attrs) {
64        super(ctx, attrs);
65        DisplayMetrics metrics = ctx.getResources().getDisplayMetrics();
66        float mDpToPix = metrics.density;
67        mDotRadius = DOT_SIZE * mDpToPix;
68        mBorder = BORDER_SIZE * mDpToPix;
69        mBarPaint1 = new Paint();
70
71        mDotPaint = new Paint();
72
73        mDotPaint.setStyle(Paint.Style.FILL);
74        mDotPaint.setColor(ctx.getResources().getColor(R.color.slider_dot_color));
75        mSliderColor = ctx.getResources().getColor(R.color.slider_line_color);
76
77        mBarPaint1.setStyle(Paint.Style.FILL);
78
79        mLinePaint1 = new Paint();
80        mLinePaint1.setColor(Color.GRAY);
81        mLinePaint2 = new Paint();
82        mLinePaint2.setColor(mSliderColor);
83        mLinePaint2.setStrokeWidth(4);
84
85        int[] colors = new int[16 * 16];
86        for (int i = 0; i < colors.length; i++) {
87            int y = i / (16 * 8);
88            int x = (i / 8) % 2;
89            colors[i] = (x == y) ? 0xFFAAAAAA : 0xFF444444;
90        }
91        Bitmap bitmap = Bitmap.createBitmap(colors, 16, 16, Bitmap.Config.ARGB_8888);
92        BitmapShader bs = new BitmapShader(bitmap, Shader.TileMode.REPEAT, Shader.TileMode.REPEAT);
93        mCheckPaint = new Paint();
94        mCheckPaint.setShader(bs);
95    }
96
97    public boolean onDown(MotionEvent e) {
98        return true;
99    }
100
101    @Override
102    public boolean onTouchEvent(MotionEvent event) {
103        float ox = mDotX;
104        float oy = mDotY;
105
106        float x = event.getX();
107        float y = event.getY();
108
109        mDotX = x;
110
111        if (mDotX < mBorder) {
112            mDotX = mBorder;
113        }
114
115        if (mDotX > mWidth - mBorder) {
116            mDotX = mWidth - mBorder;
117        }
118        mHSVO[3] = (mDotX - mBorder) / (mWidth - mBorder * 2);
119        notifyColorListeners(mHSVO);
120        setupButton();
121        invalidate((int) (ox - mDotRadius), (int) (oy - mDotRadius), (int) (ox + mDotRadius),
122                (int) (oy + mDotRadius));
123        invalidate(
124                (int) (mDotX - mDotRadius), (int) (mDotY - mDotRadius), (int) (mDotX + mDotRadius),
125                (int) (mDotY + mDotRadius));
126
127        return true;
128    }
129
130    private void setupButton() {
131        float pos = mHSVO[3] * (mWidth - mBorder * 2);
132        mDotX = pos + mBorder;
133
134        int[] colors3 = new int[] {
135        mSliderColor, mSliderColor, 0x66000000, 0 };
136        RadialGradient g = new RadialGradient(mDotX, mDotY, mDotRadius, colors3, new float[] {
137        0, .3f, .31f, 1 }, Shader.TileMode.CLAMP);
138        mDotPaint.setShader(g);
139    }
140
141    @Override
142    protected void onSizeChanged(int w, int h, int oldw, int oldh) {
143        mWidth = w;
144        mHeight = h;
145        mDotY = mHeight / 2;
146        updatePaint();
147        setupButton();
148    }
149
150    private void updatePaint() {
151        float[] hsvo = Arrays.copyOf(mHSVO, 4);
152        hsvo[2] = 1;
153        hsvo[1] = 1;
154        hsvo[3] = 1;
155        int color2 = Color.HSVToColor(hsvo);
156        hsvo[2] = 0;
157        int color1 = Color.HSVToColor(hsvo);
158
159        Shader sg = new LinearGradient(
160                mBorder, mBorder, mWidth - mBorder, mBorder,
161                color1, color2, Shader.TileMode.CLAMP);
162        mBarPaint1.setShader(sg);
163
164    }
165
166    @Override
167    protected void onDraw(Canvas canvas) {
168        super.onDraw(canvas);
169        canvas.drawColor(mBgcolor);
170        canvas.drawRect(mBorder, mBorder, mWidth - mBorder, mHeight - mBorder, mCheckPaint);
171        canvas.drawRect(mBorder, mBorder, mWidth - mBorder, mHeight - mBorder, mBarPaint1);
172        canvas.drawLine(mDotX, mDotY, mWidth - mBorder, mDotY, mLinePaint1);
173        canvas.drawLine(mBorder, mDotY, mDotX, mDotY, mLinePaint2);
174        if (mDotX != Float.NaN) {
175            canvas.drawCircle(mDotX, mDotY, mDotRadius, mDotPaint);
176        }
177    }
178
179    @Override
180    public void setColor(float[] hsv) {
181        System.arraycopy(hsv, 0, mHSVO, 0, mHSVO.length);
182
183        float oy = mDotY;
184
185        updatePaint();
186        setupButton();
187        invalidate();
188    }
189
190    public void notifyColorListeners(float[] hsvo) {
191        for (ColorListener l : mColorListeners) {
192            l.setColor(hsvo);
193        }
194    }
195
196    public void addColorListener(ColorListener l) {
197        mColorListeners.add(l);
198    }
199
200    public void removeColorListener(ColorListener l) {
201        mColorListeners.remove(l);
202    }
203}
204