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