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