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.camera.ui;
18
19import com.android.camera.PreferenceGroup;
20import com.android.camera.R;
21import com.android.camera.Util;
22
23import android.content.Context;
24import android.content.res.Resources;
25import android.graphics.Canvas;
26import android.graphics.Paint;
27import android.graphics.Path;
28import android.graphics.RectF;
29import android.os.Handler;
30import android.os.SystemClock;
31import android.util.AttributeSet;
32import android.view.MotionEvent;
33import android.view.View;
34import android.widget.ImageView;
35
36/**
37 * A view that contains camera setting indicators in two levels. The first-level
38 * indicators including the zoom, camera picker, flash and second-level control.
39 * The second-level indicators are the merely for the camera settings.
40 */
41public class IndicatorControlWheel extends IndicatorControl implements
42        View.OnClickListener {
43    public static final int HIGHLIGHT_WIDTH = 4;
44
45    private static final String TAG = "IndicatorControlWheel";
46    private static final int HIGHLIGHT_DEGREES = 30;
47    private static final double HIGHLIGHT_RADIANS = Math.toRadians(HIGHLIGHT_DEGREES);
48
49    // The following angles are based in the zero degree on the right. Here we
50    // have the CameraPicker, ZoomControl and the Settings icons in the
51    // first-level. For consistency, we treat the zoom control as one of the
52    // indicator buttons but it needs additional efforts for rotation animation.
53    // For second-level indicators, the indicators are located evenly between start
54    // and end angle. In addition, these indicators for the second-level hidden
55    // in the same wheel with larger angle values are visible after rotation.
56    private static final int FIRST_LEVEL_START_DEGREES = 74;
57    private static final int FIRST_LEVEL_END_DEGREES = 286;
58    private static final int FIRST_LEVEL_SECTOR_DEGREES = 45;
59    private static final int SECOND_LEVEL_START_DEGREES = 60;
60    private static final int SECOND_LEVEL_END_DEGREES = 300;
61    private static final int MAX_ZOOM_CONTROL_DEGREES = 264;
62    private static final int CLOSE_ICON_DEFAULT_DEGREES = 315;
63
64    private static final int ANIMATION_TIME = 300; // milliseconds
65
66    // The width of the edges on both sides of the wheel, which has less alpha.
67    private static final float EDGE_STROKE_WIDTH = 6f;
68    private static final int TIME_LAPSE_ARC_WIDTH = 6;
69
70    private final int HIGHLIGHT_COLOR;
71    private final int HIGHLIGHT_FAN_COLOR;
72    private final int TIME_LAPSE_ARC_COLOR;
73
74    // The center of the shutter button.
75    private int mCenterX, mCenterY;
76    // The width of the wheel stroke.
77    private int mStrokeWidth;
78    private double mShutterButtonRadius;
79    private double mWheelRadius;
80    private double mChildRadians[];
81    private Paint mBackgroundPaint;
82    private RectF mBackgroundRect;
83    // The index of the child that is being pressed. -1 means no child is being
84    // pressed.
85    private int mPressedIndex = -1;
86
87    // Time lapse recording variables.
88    private int mTimeLapseInterval;  // in ms
89    private long mRecordingStartTime = 0;
90    private long mNumberOfFrames = 0;
91
92    // Remember the last event for event cancelling if out of bound.
93    private MotionEvent mLastMotionEvent;
94
95    private ImageView mSecondLevelIcon;
96    private ImageView mCloseIcon;
97
98    // Variables for animation.
99    private long mAnimationStartTime;
100    private boolean mInAnimation = false;
101    private Handler mHandler = new Handler();
102    private final Runnable mRunnable = new Runnable() {
103        public void run() {
104            requestLayout();
105        }
106    };
107
108    // Variables for level control.
109    private int mCurrentLevel = 0;
110    private int mSecondLevelStartIndex = -1;
111    private double mStartVisibleRadians[] = new double[2];
112    private double mEndVisibleRadians[] = new double[2];
113    private double mSectorRadians[] = new double[2];
114    private double mTouchSectorRadians[] = new double[2];
115
116    private ZoomControlWheel mZoomControl;
117    private boolean mInitialized;
118
119    public IndicatorControlWheel(Context context, AttributeSet attrs) {
120        super(context, attrs);
121        Resources resources = context.getResources();
122        HIGHLIGHT_COLOR = resources.getColor(R.color.review_control_pressed_color);
123        HIGHLIGHT_FAN_COLOR = resources.getColor(R.color.review_control_pressed_fan_color);
124        TIME_LAPSE_ARC_COLOR = resources.getColor(R.color.time_lapse_arc);
125
126        setWillNotDraw(false);
127
128        mBackgroundPaint = new Paint();
129        mBackgroundPaint.setStyle(Paint.Style.STROKE);
130        mBackgroundPaint.setAntiAlias(true);
131
132        mBackgroundRect = new RectF();
133    }
134
135    private int getChildCountByLevel(int level) {
136        // Get current child count by level.
137        if (level == 1) {
138            return (getChildCount() - mSecondLevelStartIndex);
139        } else {
140            return mSecondLevelStartIndex;
141        }
142    }
143
144    private void changeIndicatorsLevel() {
145        mPressedIndex = -1;
146        dismissSettingPopup();
147        mInAnimation = true;
148        mAnimationStartTime = SystemClock.uptimeMillis();
149        requestLayout();
150    }
151
152    @Override
153    public void onClick(View view) {
154        changeIndicatorsLevel();
155    }
156
157    public void initialize(Context context, PreferenceGroup group,
158            boolean isZoomSupported, String[] keys, String[] otherSettingKeys) {
159        mShutterButtonRadius = IndicatorControlWheelContainer.SHUTTER_BUTTON_RADIUS;
160        mStrokeWidth = Util.dpToPixel(IndicatorControlWheelContainer.STROKE_WIDTH);
161        mWheelRadius = mShutterButtonRadius + mStrokeWidth * 0.5;
162
163        setPreferenceGroup(group);
164
165        // Add the ZoomControl if supported.
166        if (isZoomSupported) {
167            mZoomControl = (ZoomControlWheel) findViewById(R.id.zoom_control);
168            mZoomControl.setVisibility(View.VISIBLE);
169        }
170
171        // Add CameraPicker.
172        initializeCameraPicker();
173
174        // Add second-level Indicator Icon.
175        mSecondLevelIcon = addImageButton(context, R.drawable.ic_settings_holo_light, true);
176        mSecondLevelStartIndex = getChildCount();
177
178        // Add second-level buttons.
179        mCloseIcon = addImageButton(context, R.drawable.btn_wheel_close_settings, false);
180        addControls(keys, otherSettingKeys);
181
182        // The angle(in radians) of each icon for touch events.
183        mChildRadians = new double[getChildCount()];
184        presetFirstLevelChildRadians();
185        presetSecondLevelChildRadians();
186        mInitialized = true;
187    }
188
189    private ImageView addImageButton(Context context, int resourceId, boolean rotatable) {
190        ImageView view;
191        if (rotatable) {
192            view = new RotateImageView(context);
193        } else {
194            view = new TwoStateImageView(context);
195        }
196        view.setImageResource(resourceId);
197        view.setOnClickListener(this);
198        addView(view);
199        return view;
200    }
201
202    private int getTouchIndicatorIndex(double delta) {
203        // The delta is the angle of touch point in radians.
204        if (mInAnimation) return -1;
205        int count = getChildCountByLevel(mCurrentLevel);
206        if (count == 0) return -1;
207        int sectors = count - 1;
208        int startIndex = (mCurrentLevel == 0) ? 0 : mSecondLevelStartIndex;
209        int endIndex;
210        if (mCurrentLevel == 0) {
211            // Skip the first component if it is zoom control, as we will
212            // deal with it specifically.
213            if (mZoomControl != null) startIndex++;
214            endIndex = mSecondLevelStartIndex - 1;
215        } else {
216            endIndex = getChildCount() - 1;
217        }
218        // Check which indicator is touched.
219        double halfTouchSectorRadians = mTouchSectorRadians[mCurrentLevel];
220        if ((delta >= (mChildRadians[startIndex] - halfTouchSectorRadians)) &&
221                (delta <= (mChildRadians[endIndex] + halfTouchSectorRadians))) {
222            int index = 0;
223            if (mCurrentLevel == 1) {
224                index = (int) ((delta - mChildRadians[startIndex])
225                        / mSectorRadians[mCurrentLevel]);
226                // greater than the center of ending indicator
227                if (index > sectors) return (startIndex + sectors);
228                // less than the center of starting indicator
229                if (index < 0) return startIndex;
230            }
231            if (delta <= (mChildRadians[startIndex + index]
232                    + halfTouchSectorRadians)) {
233                return (startIndex + index);
234            }
235            if (delta >= (mChildRadians[startIndex + index + 1]
236                    - halfTouchSectorRadians)) {
237                return (startIndex + index + 1);
238            }
239
240            // It must be for zoom control if the touch event is in the visible
241            // range and not for other indicator buttons.
242            if ((mCurrentLevel == 0) && (mZoomControl != null)) return 0;
243        }
244        return -1;
245    }
246
247    private void injectMotionEvent(int viewIndex, MotionEvent event, int action) {
248        View v = getChildAt(viewIndex);
249        event.setAction(action);
250        v.dispatchTouchEvent(event);
251    }
252
253    @Override
254    public boolean dispatchTouchEvent(MotionEvent event) {
255        if (!onFilterTouchEventForSecurity(event)) return false;
256        mLastMotionEvent = event;
257        int action = event.getAction();
258
259        double dx = event.getX() - mCenterX;
260        double dy = mCenterY - event.getY();
261        double radius = Math.sqrt(dx * dx + dy * dy);
262
263        // Ignore the event if too far from the shutter button.
264        if ((radius <= (mWheelRadius + mStrokeWidth)) && (radius > mShutterButtonRadius)) {
265            double delta = Math.atan2(dy, dx);
266            if (delta < 0) delta += Math.PI * 2;
267            int index = getTouchIndicatorIndex(delta);
268            // Check if the touch event is for zoom control.
269            if ((mZoomControl != null) && (index == 0)) {
270                mZoomControl.dispatchTouchEvent(event);
271            }
272            // Move over from one indicator to another.
273            if ((index != mPressedIndex) || (action == MotionEvent.ACTION_DOWN)) {
274                if (mPressedIndex != -1) {
275                    injectMotionEvent(mPressedIndex, event, MotionEvent.ACTION_CANCEL);
276                } else {
277                    // Cancel the popup if it is different from the selected.
278                    if (getSelectedIndicatorIndex() != index) dismissSettingPopup();
279                }
280                if ((index != -1) && (action == MotionEvent.ACTION_MOVE)) {
281                    if (mCurrentLevel != 0) {
282                        injectMotionEvent(index, event, MotionEvent.ACTION_DOWN);
283                    }
284                }
285            }
286            if ((index != -1) && (action != MotionEvent.ACTION_MOVE)) {
287                getChildAt(index).dispatchTouchEvent(event);
288            }
289            // Do not highlight the CameraPicker or Settings icon if we
290            // touch from the zoom control to one of them.
291            if ((mCurrentLevel == 0) && (index != 0)
292                    && (action == MotionEvent.ACTION_MOVE)) {
293                return true;
294            }
295            // Once the button is up, reset the press index.
296            mPressedIndex = (action == MotionEvent.ACTION_UP) ? -1 : index;
297            invalidate();
298            return true;
299        }
300        // The event is not on any of the child.
301        onTouchOutBound();
302        return false;
303    }
304
305    private void rotateWheel() {
306        int totalDegrees = CLOSE_ICON_DEFAULT_DEGREES - SECOND_LEVEL_START_DEGREES;
307        int startAngle = ((mCurrentLevel == 0) ? CLOSE_ICON_DEFAULT_DEGREES
308                                               : SECOND_LEVEL_START_DEGREES);
309        if (mCurrentLevel == 0) totalDegrees = -totalDegrees;
310
311        int elapsedTime = (int) (SystemClock.uptimeMillis() - mAnimationStartTime);
312        if (elapsedTime >= ANIMATION_TIME) {
313            elapsedTime = ANIMATION_TIME;
314            mCurrentLevel = (mCurrentLevel == 0) ? 1 : 0;
315            mInAnimation = false;
316        }
317
318        int expectedAngle = startAngle + (totalDegrees * elapsedTime / ANIMATION_TIME);
319        double increment = Math.toRadians(expectedAngle)
320                - mChildRadians[mSecondLevelStartIndex];
321        for (int i = 0 ; i < getChildCount(); ++i) mChildRadians[i] += increment;
322        // We also need to rotate the zoom control wheel as well.
323        if (mZoomControl != null) {
324            mZoomControl.rotate(mChildRadians[0]
325                    - Math.toRadians(MAX_ZOOM_CONTROL_DEGREES));
326        }
327    }
328
329    @Override
330    protected void onLayout(
331            boolean changed, int left, int top, int right, int bottom) {
332        if (!mInitialized) return;
333        if (mInAnimation) {
334            rotateWheel();
335            mHandler.post(mRunnable);
336        }
337        mCenterX = right - left - Util.dpToPixel(
338                IndicatorControlWheelContainer.FULL_WHEEL_RADIUS);
339        mCenterY = (bottom - top) / 2;
340
341        // Layout the indicators based on the current level.
342        // The icons are spreaded on the left side of the shutter button.
343        for (int i = 0; i < getChildCount(); ++i) {
344            View view = getChildAt(i);
345            // We still need to show the disabled indicators in the second level.
346            double radian = mChildRadians[i];
347            double startVisibleRadians = mInAnimation
348                    ? mStartVisibleRadians[1]
349                    : mStartVisibleRadians[mCurrentLevel];
350            double endVisibleRadians = mInAnimation
351                    ? mEndVisibleRadians[1]
352                    : mEndVisibleRadians[mCurrentLevel];
353            if ((!view.isEnabled() && (mCurrentLevel == 0))
354                    || (radian < (startVisibleRadians - HIGHLIGHT_RADIANS / 2))
355                    || (radian > (endVisibleRadians + HIGHLIGHT_RADIANS / 2))) {
356                view.setVisibility(View.GONE);
357                continue;
358            }
359            view.setVisibility(View.VISIBLE);
360            int x = mCenterX + (int)(mWheelRadius * Math.cos(radian));
361            int y = mCenterY - (int)(mWheelRadius * Math.sin(radian));
362            int width = view.getMeasuredWidth();
363            int height = view.getMeasuredHeight();
364            if (view == mZoomControl) {
365                // ZoomControlWheel matches the size of its parent view.
366                view.layout(0, 0, right - left, bottom - top);
367            } else {
368                view.layout(x - width / 2, y - height / 2, x + width / 2,
369                        y + height / 2);
370            }
371        }
372    }
373
374    private void presetFirstLevelChildRadians() {
375        // Set the visible range in the first-level indicator wheel.
376        mStartVisibleRadians[0] = Math.toRadians(FIRST_LEVEL_START_DEGREES);
377        mTouchSectorRadians[0] = HIGHLIGHT_RADIANS;
378        mEndVisibleRadians[0] = Math.toRadians(FIRST_LEVEL_END_DEGREES);
379
380        // Set the angle of each component in the first-level indicator wheel.
381        int startIndex = 0;
382        if (mZoomControl != null) {
383            mChildRadians[startIndex++] = Math.toRadians(MAX_ZOOM_CONTROL_DEGREES);
384        }
385        if (mCameraPicker != null) {
386            mChildRadians[startIndex++] = Math.toRadians(FIRST_LEVEL_START_DEGREES);
387        }
388        mChildRadians[startIndex++] = Math.toRadians(FIRST_LEVEL_END_DEGREES);
389    }
390
391    private void presetSecondLevelChildRadians() {
392        int count = getChildCountByLevel(1);
393        int sectors = (count <= 1) ? 1 : (count - 1);
394        double sectorDegrees =
395                ((SECOND_LEVEL_END_DEGREES - SECOND_LEVEL_START_DEGREES) / sectors);
396        mSectorRadians[1] = Math.toRadians(sectorDegrees);
397
398        double degrees = CLOSE_ICON_DEFAULT_DEGREES;
399        mStartVisibleRadians[1] = Math.toRadians(SECOND_LEVEL_START_DEGREES);
400
401        int startIndex = mSecondLevelStartIndex;
402        for (int i = 0; i < count; i++) {
403            mChildRadians[startIndex + i] = Math.toRadians(degrees);
404            degrees += sectorDegrees;
405        }
406
407        // The radians for the touch sector of an indicator.
408        mTouchSectorRadians[1] =
409                Math.min(HIGHLIGHT_RADIANS, Math.toRadians(sectorDegrees));
410
411        mEndVisibleRadians[1] = Math.toRadians(SECOND_LEVEL_END_DEGREES);
412    }
413
414    public void startTimeLapseAnimation(int timeLapseInterval, long startTime) {
415        mTimeLapseInterval = timeLapseInterval;
416        mRecordingStartTime = startTime;
417        mNumberOfFrames = 0;
418        invalidate();
419    }
420
421    public void stopTimeLapseAnimation() {
422        mTimeLapseInterval = 0;
423        invalidate();
424    }
425
426    private int getSelectedIndicatorIndex() {
427        for (int i = 0; i < mIndicators.size(); i++) {
428            AbstractIndicatorButton b = mIndicators.get(i);
429            if (b.getPopupWindow() != null) {
430                return indexOfChild(b);
431            }
432        }
433        if (mPressedIndex != -1) {
434            View v = getChildAt(mPressedIndex);
435            if (!(v instanceof AbstractIndicatorButton) && v.isEnabled()) {
436                return mPressedIndex;
437            }
438        }
439        return -1;
440    }
441
442    @Override
443    protected void onDraw(Canvas canvas) {
444        int selectedIndex = getSelectedIndicatorIndex();
445
446        // Draw the highlight arc if an indicator is selected or being pressed.
447        // And skip the zoom control which index is zero.
448        if (selectedIndex >= 1) {
449            int degree = (int) Math.toDegrees(mChildRadians[selectedIndex]);
450            float innerR = (float) mShutterButtonRadius;
451            float outerR = (float) (mShutterButtonRadius + mStrokeWidth +
452                    EDGE_STROKE_WIDTH * 0.5);
453
454            // Construct the path of the fan-shaped semi-transparent area.
455            Path fanPath = new Path();
456            mBackgroundRect.set(mCenterX - innerR, mCenterY - innerR,
457                    mCenterX + innerR, mCenterY + innerR);
458            fanPath.arcTo(mBackgroundRect, -degree + HIGHLIGHT_DEGREES / 2,
459                    -HIGHLIGHT_DEGREES);
460            mBackgroundRect.set(mCenterX - outerR, mCenterY - outerR,
461                    mCenterX + outerR, mCenterY + outerR);
462            fanPath.arcTo(mBackgroundRect, -degree - HIGHLIGHT_DEGREES / 2,
463                    HIGHLIGHT_DEGREES);
464            fanPath.close();
465
466            mBackgroundPaint.setStrokeWidth(HIGHLIGHT_WIDTH);
467            mBackgroundPaint.setStrokeCap(Paint.Cap.SQUARE);
468            mBackgroundPaint.setStyle(Paint.Style.FILL_AND_STROKE);
469            mBackgroundPaint.setColor(HIGHLIGHT_FAN_COLOR);
470            canvas.drawPath(fanPath, mBackgroundPaint);
471
472            // Draw the highlight edge
473            mBackgroundPaint.setStyle(Paint.Style.STROKE);
474            mBackgroundPaint.setColor(HIGHLIGHT_COLOR);
475            canvas.drawArc(mBackgroundRect, -degree - HIGHLIGHT_DEGREES / 2,
476                    HIGHLIGHT_DEGREES, false, mBackgroundPaint);
477        }
478
479        // Draw arc shaped indicator in time lapse recording.
480        if (mTimeLapseInterval != 0) {
481            // Setup rectangle and paint.
482            mBackgroundRect.set((float)(mCenterX - mShutterButtonRadius),
483                    (float)(mCenterY - mShutterButtonRadius),
484                    (float)(mCenterX + mShutterButtonRadius),
485                    (float)(mCenterY + mShutterButtonRadius));
486            mBackgroundRect.inset(3f, 3f);
487            mBackgroundPaint.setStrokeWidth(TIME_LAPSE_ARC_WIDTH);
488            mBackgroundPaint.setStrokeCap(Paint.Cap.ROUND);
489            mBackgroundPaint.setColor(TIME_LAPSE_ARC_COLOR);
490
491            // Compute the start angle and sweep angle.
492            long timeDelta = SystemClock.uptimeMillis() - mRecordingStartTime;
493            long numberOfFrames = timeDelta / mTimeLapseInterval;
494            float sweepAngle;
495            if (numberOfFrames > mNumberOfFrames) {
496                // The arc just acrosses 0 degree. Draw a full circle so it
497                // looks better.
498                sweepAngle = 360;
499                mNumberOfFrames = numberOfFrames;
500            } else {
501                sweepAngle = timeDelta % mTimeLapseInterval * 360f / mTimeLapseInterval;
502            }
503
504            canvas.drawArc(mBackgroundRect, 0, sweepAngle, false, mBackgroundPaint);
505            invalidate();
506        }
507
508        super.onDraw(canvas);
509    }
510
511    @Override
512    public void setEnabled(boolean enabled) {
513        super.setEnabled(enabled);
514        if (!mInitialized) return;
515        if (mCurrentMode == MODE_VIDEO) {
516            mSecondLevelIcon.setVisibility(enabled ? View.VISIBLE : View.INVISIBLE);
517            mCloseIcon.setVisibility(enabled ? View.VISIBLE : View.INVISIBLE);
518            requestLayout();
519        } else {
520            // We also disable the zoom button during snapshot.
521            enableZoom(enabled);
522        }
523        mSecondLevelIcon.setEnabled(enabled);
524        mCloseIcon.setEnabled(enabled);
525    }
526
527    public void enableZoom(boolean enabled) {
528        if (mZoomControl != null) mZoomControl.setEnabled(enabled);
529    }
530
531    public void onTouchOutBound() {
532        dismissSettingPopup();
533        if (mPressedIndex != -1) {
534            injectMotionEvent(mPressedIndex, mLastMotionEvent, MotionEvent.ACTION_CANCEL);
535            mPressedIndex = -1;
536            invalidate();
537        }
538    }
539
540    public void dismissSecondLevelIndicator() {
541        if (mCurrentLevel == 1) {
542            changeIndicatorsLevel();
543        }
544    }
545}
546