1/*
2 * Copyright (C) 2011 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.camera;
18
19import android.content.Context;
20import android.graphics.Canvas;
21import android.graphics.Paint;
22import android.graphics.RectF;
23import android.util.AttributeSet;
24import android.widget.ImageView;
25
26class PanoProgressBar extends ImageView {
27    @SuppressWarnings("unused")
28    private static final String TAG = "PanoProgressBar";
29    public static final int DIRECTION_NONE = 0;
30    public static final int DIRECTION_LEFT = 1;
31    public static final int DIRECTION_RIGHT = 2;
32    private float mProgress = 0;
33    private float mMaxProgress = 0;
34    private float mLeftMostProgress = 0;
35    private float mRightMostProgress = 0;
36    private float mProgressOffset = 0;
37    private float mIndicatorWidth = 0;
38    private int mDirection = 0;
39    private final Paint mBackgroundPaint = new Paint();
40    private final Paint mDoneAreaPaint = new Paint();
41    private final Paint mIndicatorPaint = new Paint();
42    private float mWidth;
43    private float mHeight;
44    private RectF mDrawBounds;
45    private OnDirectionChangeListener mListener = null;
46
47    public interface OnDirectionChangeListener {
48        public void onDirectionChange(int direction);
49    }
50
51    public PanoProgressBar(Context context, AttributeSet attrs) {
52        super(context, attrs);
53        mDoneAreaPaint.setStyle(Paint.Style.FILL);
54        mDoneAreaPaint.setAlpha(0xff);
55
56        mBackgroundPaint.setStyle(Paint.Style.FILL);
57        mBackgroundPaint.setAlpha(0xff);
58
59        mIndicatorPaint.setStyle(Paint.Style.FILL);
60        mIndicatorPaint.setAlpha(0xff);
61
62        mDrawBounds = new RectF();
63    }
64
65    public void setOnDirectionChangeListener(OnDirectionChangeListener l) {
66        mListener = l;
67    }
68
69    private void setDirection(int direction) {
70        if (mDirection != direction) {
71            mDirection = direction;
72            if (mListener != null) {
73                mListener.onDirectionChange(mDirection);
74            }
75            invalidate();
76        }
77    }
78
79    public int getDirection() {
80        return mDirection;
81    }
82
83    @Override
84    public void setBackgroundColor(int color) {
85        mBackgroundPaint.setColor(color);
86        invalidate();
87    }
88
89    public void setDoneColor(int color) {
90        mDoneAreaPaint.setColor(color);
91        invalidate();
92    }
93
94    public void setIndicatorColor(int color) {
95        mIndicatorPaint.setColor(color);
96        invalidate();
97    }
98
99    @Override
100    protected void onSizeChanged(int w, int h, int oldw, int oldh) {
101        mWidth = w;
102        mHeight = h;
103        mDrawBounds.set(0, 0, mWidth, mHeight);
104    }
105
106    public void setMaxProgress(int progress) {
107        mMaxProgress = progress;
108    }
109
110    public void setIndicatorWidth(float w) {
111        mIndicatorWidth = w;
112        invalidate();
113    }
114
115    public void setRightIncreasing(boolean rightIncreasing) {
116        if (rightIncreasing) {
117            mLeftMostProgress = 0;
118            mRightMostProgress = 0;
119            mProgressOffset = 0;
120            setDirection(DIRECTION_RIGHT);
121        } else {
122            mLeftMostProgress = mWidth;
123            mRightMostProgress = mWidth;
124            mProgressOffset = mWidth;
125            setDirection(DIRECTION_LEFT);
126        }
127        invalidate();
128    }
129
130    public void setProgress(int progress) {
131        // The panning direction will be decided after user pan more than 10 degrees in one
132        // direction.
133        if (mDirection == DIRECTION_NONE) {
134            if (progress > 10) {
135                setRightIncreasing(true);
136            } else if (progress < -10) {
137                setRightIncreasing(false);
138            }
139        }
140        // mDirection might be modified by setRightIncreasing() above. Need to check again.
141        if (mDirection != DIRECTION_NONE) {
142            mProgress = progress * mWidth / mMaxProgress + mProgressOffset;
143            // value bounds.
144            mProgress = Math.min(mWidth, Math.max(0, mProgress));
145            if (mDirection == DIRECTION_RIGHT) {
146                // The right most progress is adjusted.
147                mRightMostProgress = Math.max(mRightMostProgress, mProgress);
148            }
149            if (mDirection == DIRECTION_LEFT) {
150                // The left most progress is adjusted.
151                mLeftMostProgress = Math.min(mLeftMostProgress, mProgress);
152            }
153            invalidate();
154        }
155    }
156
157    public void reset() {
158        mProgress = 0;
159        mProgressOffset = 0;
160        setDirection(DIRECTION_NONE);
161        invalidate();
162    }
163
164    @Override
165    protected void onDraw(Canvas canvas) {
166        // the background
167        canvas.drawRect(mDrawBounds, mBackgroundPaint);
168        if (mDirection != DIRECTION_NONE) {
169            // the progress area
170            canvas.drawRect(mLeftMostProgress, mDrawBounds.top, mRightMostProgress,
171                    mDrawBounds.bottom, mDoneAreaPaint);
172            // the indication bar
173            float l;
174            float r;
175            if (mDirection == DIRECTION_RIGHT) {
176                l = Math.max(mProgress - mIndicatorWidth, 0f);
177                r = mProgress;
178            } else {
179                l = mProgress;
180                r = Math.min(mProgress + mIndicatorWidth, mWidth);
181            }
182            canvas.drawRect(l, mDrawBounds.top, r, mDrawBounds.bottom, mIndicatorPaint);
183        }
184
185        // draw the mask image on the top for shaping.
186        super.onDraw(canvas);
187    }
188}
189