1/*
2 * Copyright (C) 2012 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.app;
18
19import android.content.Context;
20import android.graphics.Bitmap;
21import android.graphics.BitmapFactory;
22import android.graphics.Canvas;
23import android.view.MotionEvent;
24
25import com.android.gallery3d.R;
26
27/**
28 * The trim time bar view, which includes the current and total time, the progress
29 * bar, and the scrubbers for current time, start and end time for trimming.
30 */
31public class TrimTimeBar extends TimeBar {
32
33    public static final int SCRUBBER_NONE = 0;
34    public static final int SCRUBBER_START = 1;
35    public static final int SCRUBBER_CURRENT = 2;
36    public static final int SCRUBBER_END = 3;
37
38    private int mPressedThumb = SCRUBBER_NONE;
39
40    // On touch event, the setting order is Scrubber Position -> Time ->
41    // PlayedBar. At the setTimes(), activity can update the Time directly, then
42    // PlayedBar will be updated too.
43    private int mTrimStartScrubberLeft;
44    private int mTrimEndScrubberLeft;
45
46    private int mTrimStartScrubberTop;
47    private int mTrimEndScrubberTop;
48
49    private int mTrimStartTime;
50    private int mTrimEndTime;
51
52    private final Bitmap mTrimStartScrubber;
53    private final Bitmap mTrimEndScrubber;
54    public TrimTimeBar(Context context, Listener listener) {
55        super(context, listener);
56
57        mTrimStartTime = 0;
58        mTrimEndTime = 0;
59        mTrimStartScrubberLeft = 0;
60        mTrimEndScrubberLeft = 0;
61        mTrimStartScrubberTop = 0;
62        mTrimEndScrubberTop = 0;
63
64        mTrimStartScrubber = BitmapFactory.decodeResource(getResources(),
65                R.drawable.text_select_handle_left);
66        mTrimEndScrubber = BitmapFactory.decodeResource(getResources(),
67                R.drawable.text_select_handle_right);
68        // Increase the size of this trimTimeBar, but minimize the scrubber
69        // touch padding since we have 3 scrubbers now.
70        mScrubberPadding = 0;
71        mVPaddingInPx = mVPaddingInPx * 3 / 2;
72    }
73
74    private int getBarPosFromTime(int time) {
75        return mProgressBar.left +
76                (int) ((mProgressBar.width() * (long) time) / mTotalTime);
77    }
78
79    private int trimStartScrubberTipOffset() {
80        return mTrimStartScrubber.getWidth() * 3 / 4;
81    }
82
83    private int trimEndScrubberTipOffset() {
84        return mTrimEndScrubber.getWidth() / 4;
85    }
86
87    // Based on all the time info (current, total, trimStart, trimEnd), we
88    // decide the playedBar size.
89    private void updatePlayedBarAndScrubberFromTime() {
90        // According to the Time, update the Played Bar
91        mPlayedBar.set(mProgressBar);
92        if (mTotalTime > 0) {
93            // set playedBar according to the trim time.
94            mPlayedBar.left = getBarPosFromTime(mTrimStartTime);
95            mPlayedBar.right = getBarPosFromTime(mCurrentTime);
96            if (!mScrubbing) {
97                mScrubberLeft = mPlayedBar.right - mScrubber.getWidth() / 2;
98                mTrimStartScrubberLeft = mPlayedBar.left - trimStartScrubberTipOffset();
99                mTrimEndScrubberLeft = getBarPosFromTime(mTrimEndTime)
100                        - trimEndScrubberTipOffset();
101            }
102        } else {
103            // If the video is not prepared, just show the scrubber at the end
104            // of progressBar
105            mPlayedBar.right = mProgressBar.left;
106            mScrubberLeft = mProgressBar.left - mScrubber.getWidth() / 2;
107            mTrimStartScrubberLeft = mProgressBar.left - trimStartScrubberTipOffset();
108            mTrimEndScrubberLeft = mProgressBar.right - trimEndScrubberTipOffset();
109        }
110    }
111
112    private void initTrimTimeIfNeeded() {
113        if (mTotalTime > 0 && mTrimEndTime == 0) {
114            mTrimEndTime = mTotalTime;
115        }
116    }
117
118    private void update() {
119        initTrimTimeIfNeeded();
120        updatePlayedBarAndScrubberFromTime();
121        invalidate();
122    }
123
124    @Override
125    public void setTime(int currentTime, int totalTime,
126            int trimStartTime, int trimEndTime) {
127        if (mCurrentTime == currentTime && mTotalTime == totalTime
128                && mTrimStartTime == trimStartTime && mTrimEndTime == trimEndTime) {
129            return;
130        }
131        mCurrentTime = currentTime;
132        mTotalTime = totalTime;
133        mTrimStartTime = trimStartTime;
134        mTrimEndTime = trimEndTime;
135        update();
136    }
137
138    private int whichScrubber(float x, float y) {
139        if (inScrubber(x, y, mTrimStartScrubberLeft, mTrimStartScrubberTop, mTrimStartScrubber)) {
140            return SCRUBBER_START;
141        } else if (inScrubber(x, y, mTrimEndScrubberLeft, mTrimEndScrubberTop, mTrimEndScrubber)) {
142            return SCRUBBER_END;
143        } else if (inScrubber(x, y, mScrubberLeft, mScrubberTop, mScrubber)) {
144            return SCRUBBER_CURRENT;
145        }
146        return SCRUBBER_NONE;
147    }
148
149    private boolean inScrubber(float x, float y, int startX, int startY, Bitmap scrubber) {
150        int scrubberRight = startX + scrubber.getWidth();
151        int scrubberBottom = startY + scrubber.getHeight();
152        return startX < x && x < scrubberRight && startY < y && y < scrubberBottom;
153    }
154
155    private int clampScrubber(int scrubberLeft, int offset, int lowerBound, int upperBound) {
156        int max = upperBound - offset;
157        int min = lowerBound - offset;
158        return Math.min(max, Math.max(min, scrubberLeft));
159    }
160
161    private int getScrubberTime(int scrubberLeft, int offset) {
162        return (int) ((long) (scrubberLeft + offset - mProgressBar.left)
163                * mTotalTime / mProgressBar.width());
164    }
165
166    @Override
167    protected void onLayout(boolean changed, int l, int t, int r, int b) {
168        int w = r - l;
169        int h = b - t;
170        if (!mShowTimes && !mShowScrubber) {
171            mProgressBar.set(0, 0, w, h);
172        } else {
173            int margin = mScrubber.getWidth() / 3;
174            if (mShowTimes) {
175                margin += mTimeBounds.width();
176            }
177            int progressY = h / 4;
178            int scrubberY = progressY - mScrubber.getHeight() / 2 + 1;
179            mScrubberTop = scrubberY;
180            mTrimStartScrubberTop = progressY;
181            mTrimEndScrubberTop = progressY;
182            mProgressBar.set(
183                    getPaddingLeft() + margin, progressY,
184                    w - getPaddingRight() - margin, progressY + 4);
185        }
186        update();
187    }
188
189    @Override
190    protected void onDraw(Canvas canvas) {
191        // draw progress bars
192        canvas.drawRect(mProgressBar, mProgressPaint);
193        canvas.drawRect(mPlayedBar, mPlayedPaint);
194
195        if (mShowTimes) {
196            canvas.drawText(
197                    stringForTime(mCurrentTime),
198                            mTimeBounds.width() / 2 + getPaddingLeft(),
199                            mTimeBounds.height() / 2 +  mTrimStartScrubberTop,
200                    mTimeTextPaint);
201            canvas.drawText(
202                    stringForTime(mTotalTime),
203                            getWidth() - getPaddingRight() - mTimeBounds.width() / 2,
204                            mTimeBounds.height() / 2 +  mTrimStartScrubberTop,
205                    mTimeTextPaint);
206        }
207
208        // draw extra scrubbers
209        if (mShowScrubber) {
210            canvas.drawBitmap(mScrubber, mScrubberLeft, mScrubberTop, null);
211            canvas.drawBitmap(mTrimStartScrubber, mTrimStartScrubberLeft,
212                    mTrimStartScrubberTop, null);
213            canvas.drawBitmap(mTrimEndScrubber, mTrimEndScrubberLeft,
214                    mTrimEndScrubberTop, null);
215        }
216    }
217
218    private void updateTimeFromPos() {
219        mCurrentTime = getScrubberTime(mScrubberLeft, mScrubber.getWidth() / 2);
220        mTrimStartTime = getScrubberTime(mTrimStartScrubberLeft, trimStartScrubberTipOffset());
221        mTrimEndTime = getScrubberTime(mTrimEndScrubberLeft, trimEndScrubberTipOffset());
222    }
223
224    @Override
225    public boolean onTouchEvent(MotionEvent event) {
226        if (mShowScrubber) {
227            int x = (int) event.getX();
228            int y = (int) event.getY();
229
230            switch (event.getAction()) {
231                case MotionEvent.ACTION_DOWN:
232                    mPressedThumb = whichScrubber(x, y);
233                    switch (mPressedThumb) {
234                        case SCRUBBER_NONE:
235                            break;
236                        case SCRUBBER_CURRENT:
237                            mScrubbing = true;
238                            mScrubberCorrection = x - mScrubberLeft;
239                            break;
240                        case SCRUBBER_START:
241                            mScrubbing = true;
242                            mScrubberCorrection = x - mTrimStartScrubberLeft;
243                            break;
244                        case SCRUBBER_END:
245                            mScrubbing = true;
246                            mScrubberCorrection = x - mTrimEndScrubberLeft;
247                            break;
248                    }
249                    if (mScrubbing == true) {
250                        mListener.onScrubbingStart();
251                        return true;
252                    }
253                    break;
254                case MotionEvent.ACTION_MOVE:
255                    if (mScrubbing) {
256                        int seekToTime = -1;
257                        int lowerBound = mTrimStartScrubberLeft + trimStartScrubberTipOffset();
258                        int upperBound = mTrimEndScrubberLeft + trimEndScrubberTipOffset();
259                        switch (mPressedThumb) {
260                            case SCRUBBER_CURRENT:
261                                mScrubberLeft = x - mScrubberCorrection;
262                                mScrubberLeft =
263                                        clampScrubber(mScrubberLeft,
264                                                mScrubber.getWidth() / 2,
265                                                lowerBound, upperBound);
266                                seekToTime = getScrubberTime(mScrubberLeft,
267                                        mScrubber.getWidth() / 2);
268                                break;
269                            case SCRUBBER_START:
270                                mTrimStartScrubberLeft = x - mScrubberCorrection;
271                                // Limit start <= end
272                                if (mTrimStartScrubberLeft > mTrimEndScrubberLeft) {
273                                    mTrimStartScrubberLeft = mTrimEndScrubberLeft;
274                                }
275                                lowerBound = mProgressBar.left;
276                                mTrimStartScrubberLeft =
277                                        clampScrubber(mTrimStartScrubberLeft,
278                                                trimStartScrubberTipOffset(),
279                                                lowerBound, upperBound);
280                                seekToTime = getScrubberTime(mTrimStartScrubberLeft,
281                                        trimStartScrubberTipOffset());
282                                break;
283                            case SCRUBBER_END:
284                                mTrimEndScrubberLeft = x - mScrubberCorrection;
285                                upperBound = mProgressBar.right;
286                                mTrimEndScrubberLeft =
287                                        clampScrubber(mTrimEndScrubberLeft,
288                                                trimEndScrubberTipOffset(),
289                                                lowerBound, upperBound);
290                                seekToTime = getScrubberTime(mTrimEndScrubberLeft,
291                                        trimEndScrubberTipOffset());
292                                break;
293                        }
294                        updateTimeFromPos();
295                        updatePlayedBarAndScrubberFromTime();
296                        if (seekToTime != -1) {
297                            mListener.onScrubbingMove(seekToTime);
298                        }
299                        invalidate();
300                        return true;
301                    }
302                    break;
303                case MotionEvent.ACTION_CANCEL:
304                case MotionEvent.ACTION_UP:
305                    if (mScrubbing) {
306                        int seekToTime = 0;
307                        switch (mPressedThumb) {
308                            case SCRUBBER_CURRENT:
309                                seekToTime = getScrubberTime(mScrubberLeft,
310                                        mScrubber.getWidth() / 2);
311                                break;
312                            case SCRUBBER_START:
313                                seekToTime = getScrubberTime(mTrimStartScrubberLeft,
314                                        trimStartScrubberTipOffset());
315                                mScrubberLeft = mTrimStartScrubberLeft +
316                                        trimStartScrubberTipOffset() - mScrubber.getWidth() / 2;
317                                break;
318                            case SCRUBBER_END:
319                                seekToTime = getScrubberTime(mTrimEndScrubberLeft,
320                                        trimEndScrubberTipOffset());
321                                mScrubberLeft = mTrimEndScrubberLeft +
322                                        trimEndScrubberTipOffset() - mScrubber.getWidth() / 2;
323                                break;
324                        }
325                        updateTimeFromPos();
326                        mListener.onScrubbingEnd(seekToTime,
327                                getScrubberTime(mTrimStartScrubberLeft,
328                                        trimStartScrubberTipOffset()),
329                                getScrubberTime(mTrimEndScrubberLeft, trimEndScrubberTipOffset()));
330                        mScrubbing = false;
331                        mPressedThumb = SCRUBBER_NONE;
332                        return true;
333                    }
334                    break;
335            }
336        }
337        return false;
338    }
339}
340