1/*
2 * Copyright (C) 2010 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.photoeditor.actions;
18
19import android.content.Context;
20import android.content.res.TypedArray;
21import android.graphics.Bitmap;
22import android.graphics.Canvas;
23import android.graphics.Paint;
24import android.graphics.Region.Op;
25import android.graphics.drawable.BitmapDrawable;
26import android.util.AttributeSet;
27import android.widget.SeekBar;
28
29import com.android.gallery3d.R;
30
31/**
32 * Seek-bar that has a draggable thumb to set and get the color from predefined color set.
33 */
34class ColorSeekBar extends AbstractSeekBar {
35
36    /**
37     * Listens to color changes.
38     */
39    public interface OnColorChangeListener {
40
41        void onColorChanged(int color, boolean fromUser);
42    }
43
44    private final int[] colors;
45    private Bitmap background;
46
47    public ColorSeekBar(Context context, AttributeSet attrs) {
48        super(context, attrs);
49
50        // Set up the predefined colors that could be indexed in the seek-bar.
51        TypedArray a = getResources().obtainTypedArray(R.array.color_picker_colors);
52        colors = new int[a.length()];
53        for (int i = 0; i < a.length(); i++) {
54            colors[i] = a.getColor(i, 0x000000);
55        }
56        a.recycle();
57        setMax(colors.length - 1);
58    }
59
60    @Override
61    protected void onSizeChanged(int w, int h, int oldw, int oldh) {
62        super.onSizeChanged(w, h, oldw, oldh);
63
64        if (background != null) {
65            background.recycle();
66        }
67        background = Bitmap.createBitmap(w, h, Bitmap.Config.ARGB_8888);
68        Canvas canvas = new Canvas(background);
69
70        Paint paint = new Paint(Paint.ANTI_ALIAS_FLAG);
71        paint.setStyle(Paint.Style.FILL);
72
73        // Draw two half circles in the first and last colors at seek-bar left/right ends.
74        int radius = getThumbOffset();
75        float left = radius;
76        float right = w - radius;
77        float cy = h / 2;
78
79        canvas.save();
80        canvas.clipRect(left, 0, right, h, Op.DIFFERENCE);
81        paint.setColor(colors[0]);
82        canvas.drawCircle(left, cy, radius, paint);
83        paint.setColor(colors[colors.length - 1]);
84        canvas.drawCircle(right, cy, radius, paint);
85        canvas.restore();
86
87        // Draw color strips that make the thumb stop at every strip's center during seeking.
88        float strip = (right - left) / (colors.length - 1);
89        right = left + strip / 2;
90        paint.setColor(colors[0]);
91        canvas.drawRect(left, 0, right, h, paint);
92        left = right;
93        for (int i = 1; i < colors.length - 1; i++) {
94            right = left + strip;
95            paint.setColor(colors[i]);
96            canvas.drawRect(left, 0, right, h, paint);
97            left = right;
98        }
99        right = left + strip / 2;
100        paint.setColor(colors[colors.length - 1]);
101        canvas.drawRect(left, 0, right, h, paint);
102
103        setBackgroundDrawable(new BitmapDrawable(getResources(), background));
104    }
105
106    public void setOnColorChangeListener(final OnColorChangeListener listener) {
107        setOnSeekBarChangeListener((listener == null) ? null : new OnSeekBarChangeListener() {
108
109            @Override
110            public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {
111                listener.onColorChanged(colors[progress], fromUser);
112            }
113
114            @Override
115            public void onStartTrackingTouch(SeekBar seekBar) {
116            }
117
118            @Override
119            public void onStopTrackingTouch(SeekBar seekBar) {
120            }
121        });
122    }
123
124    public void setColorIndex(int colorIndex) {
125        setProgress(colorIndex);
126    }
127
128    public int getColor() {
129        return colors[getProgress()];
130    }
131}
132