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
26import com.android.camera.debug.Log;
27
28class PanoProgressBar extends ImageView {
29    @SuppressWarnings("unused")
30    private static final Log.Tag TAG = new Log.Tag("PanoProgressBar");
31    public static final int DIRECTION_NONE = 0;
32    public static final int DIRECTION_LEFT = 1;
33    public static final int DIRECTION_RIGHT = 2;
34    private float mProgress = 0;
35    private float mMaxProgress = 0;
36    private float mLeftMostProgress = 0;
37    private float mRightMostProgress = 0;
38    private float mProgressOffset = 0;
39    private float mIndicatorWidth = 0;
40    private int mDirection = 0;
41    private final Paint mBackgroundPaint = new Paint();
42    private final Paint mDoneAreaPaint = new Paint();
43    private final Paint mIndicatorPaint = new Paint();
44    private float mWidth;
45    private float mHeight;
46    private RectF mDrawBounds;
47    private OnDirectionChangeListener mListener = null;
48
49    public interface OnDirectionChangeListener {
50        public void onDirectionChange(int direction);
51    }
52
53    public PanoProgressBar(Context context, AttributeSet attrs) {
54        super(context, attrs);
55        mDoneAreaPaint.setStyle(Paint.Style.FILL);
56        mDoneAreaPaint.setAlpha(0xff);
57
58        mBackgroundPaint.setStyle(Paint.Style.FILL);
59        mBackgroundPaint.setAlpha(0xff);
60
61        mIndicatorPaint.setStyle(Paint.Style.FILL);
62        mIndicatorPaint.setAlpha(0xff);
63
64        mDrawBounds = new RectF();
65    }
66
67    public void setOnDirectionChangeListener(OnDirectionChangeListener l) {
68        mListener = l;
69    }
70
71    private void setDirection(int direction) {
72        if (mDirection != direction) {
73            mDirection = direction;
74            if (mListener != null) {
75                mListener.onDirectionChange(mDirection);
76            }
77            invalidate();
78        }
79    }
80
81    public int getDirection() {
82        return mDirection;
83    }
84
85    @Override
86    public void setBackgroundColor(int color) {
87        mBackgroundPaint.setColor(color);
88        invalidate();
89    }
90
91    public void setDoneColor(int color) {
92        mDoneAreaPaint.setColor(color);
93        invalidate();
94    }
95
96    public void setIndicatorColor(int color) {
97        mIndicatorPaint.setColor(color);
98        invalidate();
99    }
100
101    @Override
102    protected void onSizeChanged(int w, int h, int oldw, int oldh) {
103        mWidth = w;
104        mHeight = h;
105        mDrawBounds.set(0, 0, mWidth, mHeight);
106    }
107
108    public void setMaxProgress(int progress) {
109        mMaxProgress = progress;
110    }
111
112    public void setIndicatorWidth(float w) {
113        mIndicatorWidth = w;
114        invalidate();
115    }
116
117    public void setRightIncreasing(boolean rightIncreasing) {
118        if (rightIncreasing) {
119            mLeftMostProgress = 0;
120            mRightMostProgress = 0;
121            mProgressOffset = 0;
122            setDirection(DIRECTION_RIGHT);
123        } else {
124            mLeftMostProgress = mWidth;
125            mRightMostProgress = mWidth;
126            mProgressOffset = mWidth;
127            setDirection(DIRECTION_LEFT);
128        }
129        invalidate();
130    }
131
132    public void setProgress(int progress) {
133        // The panning direction will be decided after user pan more than 10 degrees in one
134        // direction.
135        if (mDirection == DIRECTION_NONE) {
136            if (progress > 10) {
137                setRightIncreasing(true);
138            } else if (progress < -10) {
139                setRightIncreasing(false);
140            }
141        }
142        // mDirection might be modified by setRightIncreasing() above. Need to check again.
143        if (mDirection != DIRECTION_NONE) {
144            mProgress = progress * mWidth / mMaxProgress + mProgressOffset;
145            // value bounds.
146            mProgress = Math.min(mWidth, Math.max(0, mProgress));
147            if (mDirection == DIRECTION_RIGHT) {
148                // The right most progress is adjusted.
149                mRightMostProgress = Math.max(mRightMostProgress, mProgress);
150            }
151            if (mDirection == DIRECTION_LEFT) {
152                // The left most progress is adjusted.
153                mLeftMostProgress = Math.min(mLeftMostProgress, mProgress);
154            }
155            invalidate();
156        }
157    }
158
159    public void reset() {
160        mProgress = 0;
161        mProgressOffset = 0;
162        setDirection(DIRECTION_NONE);
163        invalidate();
164    }
165
166    @Override
167    protected void onDraw(Canvas canvas) {
168        // the background
169        canvas.drawRect(mDrawBounds, mBackgroundPaint);
170        if (mDirection != DIRECTION_NONE) {
171            // the progress area
172            canvas.drawRect(mLeftMostProgress, mDrawBounds.top, mRightMostProgress,
173                    mDrawBounds.bottom, mDoneAreaPaint);
174            // the indication bar
175            float l;
176            float r;
177            if (mDirection == DIRECTION_RIGHT) {
178                l = Math.max(mProgress - mIndicatorWidth, 0f);
179                r = mProgress;
180            } else {
181                l = mProgress;
182                r = Math.min(mProgress + mIndicatorWidth, mWidth);
183            }
184            canvas.drawRect(l, mDrawBounds.top, r, mDrawBounds.bottom, mIndicatorPaint);
185        }
186
187        // draw the mask image on the top for shaping.
188        super.onDraw(canvas);
189    }
190}
191