2 * Copyright (C) 2013 The Android Open Source Project
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
8 * http://www.apache.org/licenses/LICENSE-2.0
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.
17 package com.android.camera.widget;
19 import android.animation.Animator;
20 import android.animation.AnimatorSet;
21 import android.animation.TimeInterpolator;
22 import android.animation.ValueAnimator;
23 import android.annotation.TargetApi;
24 import android.content.Context;
25 import android.graphics.Canvas;
26 import android.graphics.Point;
27 import android.graphics.Rect;
28 import android.graphics.RectF;
29 import android.net.Uri;
30 import android.os.Build;
31 import android.os.Bundle;
32 import android.os.Handler;
33 import android.os.SystemClock;
34 import android.util.AttributeSet;
35 import android.util.DisplayMetrics;
36 import android.util.SparseArray;
37 import android.view.MotionEvent;
38 import android.view.View;
39 import android.view.ViewGroup;
40 import android.view.accessibility.AccessibilityNodeInfo;
41 import android.view.animation.DecelerateInterpolator;
42 import android.widget.Scroller;
44 import com.android.camera.CameraActivity;
45 import com.android.camera.debug.Log;
46 import com.android.camera.filmstrip.DataAdapter;
47 import com.android.camera.filmstrip.FilmstripController;
48 import com.android.camera.filmstrip.ImageData;
49 import com.android.camera.ui.FilmstripGestureRecognizer;
50 import com.android.camera.ui.ZoomView;
51 import com.android.camera.util.ApiHelper;
52 import com.android.camera.util.CameraUtil;
53 import com.android.camera2.R;
55 import java.util.ArrayDeque;
56 import java.util.Arrays;
57 import java.util.Queue;
59 public class FilmstripView extends ViewGroup {
60 private static final Log.Tag TAG = new Log.Tag("FilmstripView");
62 private static final int BUFFER_SIZE = 5;
63 private static final int GEOMETRY_ADJUST_TIME_MS = 400;
64 private static final int SNAP_IN_CENTER_TIME_MS = 600;
65 private static final float FLING_COASTING_DURATION_S = 0.05f;
66 private static final int ZOOM_ANIMATION_DURATION_MS = 200;
67 private static final int CAMERA_PREVIEW_SWIPE_THRESHOLD = 300;
68 private static final float FILM_STRIP_SCALE = 0.7f;
69 private static final float FULL_SCREEN_SCALE = 1f;
71 // The min velocity at which the user must have moved their finger in
72 // pixels per millisecond to count a vertical gesture as a promote/demote
73 // at short vertical distances.
74 private static final float PROMOTE_VELOCITY = 3.5f;
75 // The min distance relative to this view's height the user must have
76 // moved their finger to count a vertical gesture as a promote/demote if
77 // they moved their finger at least at PROMOTE_VELOCITY.
78 private static final float VELOCITY_PROMOTE_HEIGHT_RATIO = 1/10f;
79 // The min distance relative to this view's height the user must have
80 // moved their finger to count a vertical gesture as a promote/demote if
81 // they moved their finger at less than PROMOTE_VELOCITY.
82 private static final float PROMOTE_HEIGHT_RATIO = 1/2f;
84 private static final float TOLERANCE = 0.1f;
85 // Only check for intercepting touch events within first 500ms
86 private static final int SWIPE_TIME_OUT = 500;
87 private static final int DECELERATION_FACTOR = 4;
89 private CameraActivity mActivity;
90 private FilmstripGestureRecognizer mGestureRecognizer;
91 private FilmstripGestureRecognizer.Listener mGestureListener;
92 private DataAdapter mDataAdapter;
93 private int mViewGapInPixel;
94 private final Rect mDrawArea = new Rect();
96 private final int mCurrentItem = (BUFFER_SIZE - 1) / 2;
98 private MyController mController;
99 private int mCenterX = -1;
100 private final ViewItem[] mViewItem = new ViewItem[BUFFER_SIZE];
102 private FilmstripController.FilmstripListener mListener;
103 private ZoomView mZoomView = null;
105 private MotionEvent mDown;
106 private boolean mCheckToIntercept = true;
108 private TimeInterpolator mViewAnimInterpolator;
110 // This is true if and only if the user is scrolling,
111 private boolean mIsUserScrolling;
112 private int mDataIdOnUserScrolling;
113 private float mOverScaleFactor = 1f;
115 private boolean mFullScreenUIHidden = false;
116 private final SparseArray<Queue<View>> recycledViews = new SparseArray<Queue<View>>();
119 * A helper class to tract and calculate the view coordination.
121 private class ViewItem {
123 /** The position of the left of the view in the whole filmstrip. */
124 private int mLeftPosition;
125 private final View mView;
126 private final ImageData mData;
127 private final RectF mViewArea;
128 private boolean mMaximumBitmapRequested;
130 private ValueAnimator mTranslationXAnimator;
131 private ValueAnimator mTranslationYAnimator;
132 private ValueAnimator mAlphaAnimator;
137 * @param id The id of the data from
138 * {@link com.android.camera.filmstrip.DataAdapter}.
139 * @param v The {@code View} representing the data.
141 public ViewItem(int id, View v, ImageData data) {
147 mMaximumBitmapRequested = false;
149 mViewArea = new RectF();
152 public boolean isMaximumBitmapRequested() {
153 return mMaximumBitmapRequested;
156 public void setMaximumBitmapRequested() {
157 mMaximumBitmapRequested = true;
161 * Returns the data id from
162 * {@link com.android.camera.filmstrip.DataAdapter}.
169 * Sets the data id from
170 * {@link com.android.camera.filmstrip.DataAdapter}.
172 public void setId(int id) {
176 /** Sets the left position of the view in the whole filmstrip. */
177 public void setLeftPosition(int pos) {
181 /** Returns the left position of the view in the whole filmstrip. */
182 public int getLeftPosition() {
183 return mLeftPosition;
186 /** Returns the translation of Y regarding the view scale. */
187 public float getTranslationY() {
188 return mView.getTranslationY() / mScale;
191 /** Returns the translation of X regarding the view scale. */
192 public float getTranslationX() {
193 return mView.getTranslationX() / mScale;
196 /** Sets the translation of Y regarding the view scale. */
197 public void setTranslationY(float transY) {
198 mView.setTranslationY(transY * mScale);
201 /** Sets the translation of X regarding the view scale. */
202 public void setTranslationX(float transX) {
203 mView.setTranslationX(transX * mScale);
206 /** Forwarding of {@link android.view.View#setAlpha(float)}. */
207 public void setAlpha(float alpha) {
208 mView.setAlpha(alpha);
211 /** Forwarding of {@link android.view.View#getAlpha()}. */
212 public float getAlpha() {
213 return mView.getAlpha();
216 /** Forwarding of {@link android.view.View#getMeasuredWidth()}. */
217 public int getMeasuredWidth() {
218 return mView.getMeasuredWidth();
222 * Animates the X translation of the view. Note: the animated value is
223 * not set directly by {@link android.view.View#setTranslationX(float)}
224 * because the value might be changed during in {@code onLayout()}.
225 * The animated value of X translation is specially handled in {@code
228 * @param targetX The final value.
229 * @param duration_ms The duration of the animation.
230 * @param interpolator Time interpolator.
232 public void animateTranslationX(
233 float targetX, long duration_ms, TimeInterpolator interpolator) {
234 if (mTranslationXAnimator == null) {
235 mTranslationXAnimator = new ValueAnimator();
236 mTranslationXAnimator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
238 public void onAnimationUpdate(ValueAnimator valueAnimator) {
239 // We invalidate the filmstrip view instead of setting the
240 // translation X because the translation X of the view is
241 // touched in onLayout(). See the documentation of
242 // animateTranslationX().
247 runAnimation(mTranslationXAnimator, getTranslationX(), targetX, duration_ms,
252 * Animates the Y translation of the view.
254 * @param targetY The final value.
255 * @param duration_ms The duration of the animation.
256 * @param interpolator Time interpolator.
258 public void animateTranslationY(
259 float targetY, long duration_ms, TimeInterpolator interpolator) {
260 if (mTranslationYAnimator == null) {
261 mTranslationYAnimator = new ValueAnimator();
262 mTranslationYAnimator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
264 public void onAnimationUpdate(ValueAnimator valueAnimator) {
265 setTranslationY((Float) valueAnimator.getAnimatedValue());
269 runAnimation(mTranslationYAnimator, getTranslationY(), targetY, duration_ms,
274 * Animates the alpha value of the view.
276 * @param targetAlpha The final value.
277 * @param duration_ms The duration of the animation.
278 * @param interpolator Time interpolator.
280 public void animateAlpha(float targetAlpha, long duration_ms,
281 TimeInterpolator interpolator) {
282 if (mAlphaAnimator == null) {
283 mAlphaAnimator = new ValueAnimator();
284 mAlphaAnimator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
286 public void onAnimationUpdate(ValueAnimator valueAnimator) {
287 ViewItem.this.setAlpha((Float) valueAnimator.getAnimatedValue());
291 runAnimation(mAlphaAnimator, getAlpha(), targetAlpha, duration_ms, interpolator);
294 private void runAnimation(final ValueAnimator animator, final float startValue,
295 final float targetValue, final long duration_ms,
296 final TimeInterpolator interpolator) {
297 if (startValue == targetValue) {
300 animator.setInterpolator(interpolator);
301 animator.setDuration(duration_ms);
302 animator.setFloatValues(startValue, targetValue);
306 /** Adjusts the translation of X regarding the view scale. */
307 public void translateXScaledBy(float transX) {
308 setTranslationX(getTranslationX() + transX * mScale);
312 * Forwarding of {@link android.view.View#getHitRect(android.graphics.Rect)}.
314 public void getHitRect(Rect rect) {
315 mView.getHitRect(rect);
318 public int getCenterX() {
319 return mLeftPosition + mView.getMeasuredWidth() / 2;
322 /** Forwarding of {@link android.view.View#getVisibility()}. */
323 public int getVisibility() {
324 return mView.getVisibility();
327 /** Forwarding of {@link android.view.View#setVisibility(int)}. */
328 public void setVisibility(int visibility) {
329 mView.setVisibility(visibility);
333 * Notifies the {@link com.android.camera.filmstrip.DataAdapter} to
336 public void resizeView(Context context, int w, int h) {
337 mDataAdapter.resizeView(context, mDataId, mView, w, h);
341 * Adds the view of the data to the view hierarchy if necessary.
343 public void addViewToHierarchy() {
344 if (indexOfChild(mView) < 0) {
349 setVisibility(View.VISIBLE);
356 * Removes from the hierarchy. Keeps the view in the view hierarchy if
357 * view type is {@code VIEW_TYPE_STICKY} and set to invisible instead.
359 * @param force {@code true} to remove the view from the hierarchy
360 * regardless of the view type.
362 public void removeViewFromHierarchy(boolean force) {
363 if (force || mData.getViewType() != ImageData.VIEW_TYPE_STICKY) {
365 mData.recycle(mView);
366 recycleView(mView, mDataId);
368 setVisibility(View.INVISIBLE);
373 * Brings the view to front by
374 * {@link #bringChildToFront(android.view.View)}
376 public void bringViewToFront() {
377 bringChildToFront(mView);
381 * The visual x position of this view, in pixels.
383 public float getX() {
388 * The visual y position of this view, in pixels.
390 public float getY() {
395 * Forwarding of {@link android.view.View#measure(int, int)}.
397 public void measure(int widthSpec, int heightSpec) {
398 mView.measure(widthSpec, heightSpec);
401 private void layoutAt(int left, int top) {
402 mView.layout(left, top, left + mView.getMeasuredWidth(),
403 top + mView.getMeasuredHeight());
407 * The bounding rect of the view.
409 public RectF getViewRect() {
410 RectF r = new RectF();
411 r.left = mView.getX();
412 r.top = mView.getY();
413 r.right = r.left + mView.getWidth() * mView.getScaleX();
414 r.bottom = r.top + mView.getHeight() * mView.getScaleY();
418 private View getView() {
423 * Layouts the view in the area assuming the center of the area is at a
424 * specific point of the whole filmstrip.
426 * @param drawArea The area when filmstrip will show in.
427 * @param refCenter The absolute X coordination in the whole filmstrip
428 * of the center of {@code drawArea}.
429 * @param scale The scale of the view on the filmstrip.
431 public void layoutWithTranslationX(Rect drawArea, int refCenter, float scale) {
432 final float translationX =
433 ((mTranslationXAnimator != null && mTranslationXAnimator.isRunning()) ?
434 (Float) mTranslationXAnimator.getAnimatedValue() : 0);
436 (int) (drawArea.centerX() + (mLeftPosition - refCenter + translationX) * scale);
437 int top = (int) (drawArea.centerY() - (mView.getMeasuredHeight() / 2) * scale);
439 mView.setScaleX(scale);
440 mView.setScaleY(scale);
442 // update mViewArea for touch detection.
443 int l = mView.getLeft();
444 int t = mView.getTop();
446 l + mView.getMeasuredWidth() * scale,
447 t + mView.getMeasuredHeight() * scale);
450 /** Returns true if the point is in the view. */
451 public boolean areaContains(float x, float y) {
452 return mViewArea.contains(x, y);
456 * Return the width of the view.
458 public int getWidth() {
459 return mView.getWidth();
463 * Returns the position of the left edge of the view area content is drawn in.
465 public int getDrawAreaLeft() {
466 return Math.round(mViewArea.left);
469 public void copyAttributes(ViewItem item) {
470 setLeftPosition(item.getLeftPosition());
472 setTranslationX(item.getTranslationX());
473 if (item.mTranslationXAnimator != null) {
474 mTranslationXAnimator = item.mTranslationXAnimator;
475 mTranslationXAnimator.removeAllUpdateListeners();
476 mTranslationXAnimator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
478 public void onAnimationUpdate(ValueAnimator valueAnimator) {
479 // We invalidate the filmstrip view instead of setting the
480 // translation X because the translation X of the view is
481 // touched in onLayout(). See the documentation of
482 // animateTranslationX().
488 setTranslationY(item.getTranslationY());
489 if (item.mTranslationYAnimator != null) {
490 mTranslationYAnimator = item.mTranslationYAnimator;
491 mTranslationYAnimator.removeAllUpdateListeners();
492 mTranslationYAnimator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
494 public void onAnimationUpdate(ValueAnimator valueAnimator) {
495 setTranslationY((Float) valueAnimator.getAnimatedValue());
500 setAlpha(item.getAlpha());
501 if (item.mAlphaAnimator != null) {
502 mAlphaAnimator = item.mAlphaAnimator;
503 mAlphaAnimator.removeAllUpdateListeners();
504 mAlphaAnimator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
506 public void onAnimationUpdate(ValueAnimator valueAnimator) {
507 ViewItem.this.setAlpha((Float) valueAnimator.getAnimatedValue());
514 * Apply a scale factor (i.e. {@code postScale}) on top of current scale at
515 * pivot point ({@code focusX}, {@code focusY}). Visually it should be the
516 * same as post concatenating current view's matrix with specified scale.
518 void postScale(float focusX, float focusY, float postScale, int viewportWidth,
519 int viewportHeight) {
520 float transX = mView.getTranslationX();
521 float transY = mView.getTranslationY();
522 // Pivot point is top left of the view, so we need to translate
523 // to scale around focus point
524 transX -= (focusX - getX()) * (postScale - 1f);
525 transY -= (focusY - getY()) * (postScale - 1f);
526 float scaleX = mView.getScaleX() * postScale;
527 float scaleY = mView.getScaleY() * postScale;
528 updateTransform(transX, transY, scaleX, scaleY, viewportWidth,
532 void updateTransform(float transX, float transY, float scaleX, float scaleY,
533 int viewportWidth, int viewportHeight) {
534 float left = transX + mView.getLeft();
535 float top = transY + mView.getTop();
536 RectF r = ZoomView.adjustToFitInBounds(new RectF(left, top,
537 left + mView.getWidth() * scaleX,
538 top + mView.getHeight() * scaleY),
539 viewportWidth, viewportHeight);
540 mView.setScaleX(scaleX);
541 mView.setScaleY(scaleY);
542 transX = r.left - mView.getLeft();
543 transY = r.top - mView.getTop();
544 mView.setTranslationX(transX);
545 mView.setTranslationY(transY);
548 void resetTransform() {
549 mView.setScaleX(FULL_SCREEN_SCALE);
550 mView.setScaleY(FULL_SCREEN_SCALE);
551 mView.setTranslationX(0f);
552 mView.setTranslationY(0f);
556 public String toString() {
557 return "DataID = " + mDataId + "\n\t left = " + mLeftPosition
558 + "\n\t viewArea = " + mViewArea
559 + "\n\t centerX = " + getCenterX()
560 + "\n\t view MeasuredSize = "
561 + mView.getMeasuredWidth() + ',' + mView.getMeasuredHeight()
562 + "\n\t view Size = " + mView.getWidth() + ',' + mView.getHeight()
563 + "\n\t view scale = " + mView.getScaleX();
568 public FilmstripView(Context context) {
570 init((CameraActivity) context);
574 public FilmstripView(Context context, AttributeSet attrs) {
575 super(context, attrs);
576 init((CameraActivity) context);
580 public FilmstripView(Context context, AttributeSet attrs, int defStyle) {
581 super(context, attrs, defStyle);
582 init((CameraActivity) context);
585 private void init(CameraActivity cameraActivity) {
586 setWillNotDraw(false);
587 mActivity = cameraActivity;
589 mDataIdOnUserScrolling = 0;
590 mController = new MyController(cameraActivity);
591 mViewAnimInterpolator = new DecelerateInterpolator();
592 mZoomView = new ZoomView(cameraActivity);
593 mZoomView.setVisibility(GONE);
596 mGestureListener = new MyGestureReceiver();
598 new FilmstripGestureRecognizer(cameraActivity, mGestureListener);
599 mSlop = (int) getContext().getResources().getDimension(R.dimen.pie_touch_slop);
600 DisplayMetrics metrics = new DisplayMetrics();
601 mActivity.getWindowManager().getDefaultDisplay().getMetrics(metrics);
602 // Allow over scaling because on high density screens, pixels are too
603 // tiny to clearly see the details at 1:1 zoom. We should not scale
604 // beyond what 1:1 would look like on a medium density screen, as
605 // scaling beyond that would only yield blur.
606 mOverScaleFactor = (float) metrics.densityDpi / (float) DisplayMetrics.DENSITY_HIGH;
607 if (mOverScaleFactor < 1f) {
608 mOverScaleFactor = 1f;
611 setAccessibilityDelegate(new AccessibilityDelegate() {
613 public void onInitializeAccessibilityNodeInfo(View host, AccessibilityNodeInfo info) {
614 super.onInitializeAccessibilityNodeInfo(host, info);
616 info.setClassName(FilmstripView.class.getName());
617 info.setScrollable(true);
618 info.addAction(AccessibilityNodeInfo.ACTION_SCROLL_FORWARD);
619 info.addAction(AccessibilityNodeInfo.ACTION_SCROLL_BACKWARD);
623 public boolean performAccessibilityAction(View host, int action, Bundle args) {
624 if (!mController.isScrolling()) {
626 case AccessibilityNodeInfo.ACTION_SCROLL_FORWARD: {
627 mController.goToNextItem();
630 case AccessibilityNodeInfo.ACTION_SCROLL_BACKWARD: {
631 boolean wentToPrevious = mController.goToPreviousItem();
632 if (!wentToPrevious) {
633 // at beginning of filmstrip, hide and go back to preview
634 mActivity.getCameraAppUI().hideFilmstrip();
638 case AccessibilityNodeInfo.ACTION_ACCESSIBILITY_FOCUS: {
639 // Prevent the view group itself from being selected.
640 // Instead, select the item in the center
641 final ViewItem currentItem = mViewItem[mCurrentItem];
642 currentItem.getView().performAccessibilityAction(action, args);
647 return super.performAccessibilityAction(host, action, args);
652 private void recycleView(View view, int dataId) {
653 final int viewType = (Integer) view.getTag(R.id.mediadata_tag_viewtype);
655 Queue<View> recycledViewsForType = recycledViews.get(viewType);
656 if (recycledViewsForType == null) {
657 recycledViewsForType = new ArrayDeque<View>();
658 recycledViews.put(viewType, recycledViewsForType);
660 recycledViewsForType.offer(view);
664 private View getRecycledView(int dataId) {
665 final int viewType = mDataAdapter.getItemViewType(dataId);
666 Queue<View> recycledViewsForType = recycledViews.get(viewType);
668 if (recycledViewsForType != null) {
669 result = recycledViewsForType.poll();
675 * Returns the controller.
677 * @return The {@code Controller}.
679 public FilmstripController getController() {
684 * Returns the draw area width of the current item.
686 public int getCurrentItemLeft() {
687 return mViewItem[mCurrentItem].getDrawAreaLeft();
690 private void setListener(FilmstripController.FilmstripListener l) {
694 private void setViewGap(int viewGap) {
695 mViewGapInPixel = viewGap;
699 * Called after current item or zoom level has changed.
701 public void zoomAtIndexChanged() {
702 if (mViewItem[mCurrentItem] == null) {
705 int id = mViewItem[mCurrentItem].getId();
706 mListener.onZoomAtIndexChanged(id, mScale);
710 * Checks if the data is at the center.
712 * @param id The id of the data to check.
713 * @return {@code True} if the data is currently at the center.
715 private boolean isDataAtCenter(int id) {
716 if (mViewItem[mCurrentItem] == null) {
719 if (mViewItem[mCurrentItem].getId() == id
720 && isCurrentItemCentered()) {
726 private void measureViewItem(ViewItem item, int boundWidth, int boundHeight) {
727 int id = item.getId();
728 ImageData imageData = mDataAdapter.getImageData(id);
729 if (imageData == null) {
730 Log.e(TAG, "trying to measure a null item");
734 Point dim = CameraUtil.resizeToFill(imageData.getWidth(), imageData.getHeight(),
735 imageData.getRotation(), boundWidth, boundHeight);
737 item.measure(MeasureSpec.makeMeasureSpec(dim.x, MeasureSpec.EXACTLY),
738 MeasureSpec.makeMeasureSpec(dim.y, MeasureSpec.EXACTLY));
742 protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
743 super.onMeasure(widthMeasureSpec, heightMeasureSpec);
745 int boundWidth = MeasureSpec.getSize(widthMeasureSpec);
746 int boundHeight = MeasureSpec.getSize(heightMeasureSpec);
747 if (boundWidth == 0 || boundHeight == 0) {
748 // Either width or height is unknown, can't measure children yet.
752 for (ViewItem item : mViewItem) {
754 measureViewItem(item, boundWidth, boundHeight);
759 mZoomView.measure(MeasureSpec.makeMeasureSpec(widthMeasureSpec, MeasureSpec.EXACTLY),
760 MeasureSpec.makeMeasureSpec(heightMeasureSpec, MeasureSpec.EXACTLY));
763 private int findTheNearestView(int pointX) {
766 // Find the first non-null ViewItem.
767 while (nearest < BUFFER_SIZE
768 && (mViewItem[nearest] == null || mViewItem[nearest].getLeftPosition() == -1)) {
771 // No existing available ViewItem
772 if (nearest == BUFFER_SIZE) {
776 int min = Math.abs(pointX - mViewItem[nearest].getCenterX());
778 for (int itemID = nearest + 1; itemID < BUFFER_SIZE && mViewItem[itemID] != null; itemID++) {
780 if (mViewItem[itemID].getLeftPosition() == -1) {
784 int c = mViewItem[itemID].getCenterX();
785 int dist = Math.abs(pointX - c);
794 private ViewItem buildItemFromData(int dataID) {
795 ImageData data = mDataAdapter.getImageData(dataID);
800 // Always scale by fixed filmstrip scale, since we only show items when
801 // in filmstrip. Preloading images with a different scale and bounds
802 // interferes with caching.
803 int width = Math.round(FILM_STRIP_SCALE * getWidth());
804 int height = Math.round(FILM_STRIP_SCALE * getHeight());
805 Log.v(TAG, "suggesting item bounds: " + width + "x" + height);
806 mDataAdapter.suggestViewSizeBound(width, height);
809 View recycled = getRecycledView(dataID);
810 View v = mDataAdapter.getView(mActivity, recycled, dataID);
814 ViewItem item = new ViewItem(dataID, v, data);
815 item.addViewToHierarchy();
819 private void checkItemAtMaxSize() {
820 ViewItem item = mViewItem[mCurrentItem];
821 if (item.isMaximumBitmapRequested()) {
824 item.setMaximumBitmapRequested();
825 // Request full size bitmap, or max that DataAdapter will create.
826 int id = item.getId();
827 int h = mDataAdapter.getImageData(id).getHeight();
828 int w = mDataAdapter.getImageData(id).getWidth();
829 item.resizeView(mActivity, w, h);
832 private void removeItem(int itemID) {
833 if (itemID >= mViewItem.length || mViewItem[itemID] == null) {
836 ImageData data = mDataAdapter.getImageData(mViewItem[itemID].getId());
838 Log.e(TAG, "trying to remove a null item");
841 mViewItem[itemID].removeViewFromHierarchy(false);
842 mViewItem[itemID] = null;
846 * We try to keep the one closest to the center of the screen at position
849 private void stepIfNeeded() {
850 if (!inFilmstrip() && !inFullScreen()) {
851 // The good timing to step to the next view is when everything is
852 // not in transition.
855 final int nearest = findTheNearestView(mCenterX);
857 if (nearest == -1 || nearest == mCurrentItem) {
860 int prevDataId = (mViewItem[mCurrentItem] == null ? -1 : mViewItem[mCurrentItem].getId());
861 final int adjust = nearest - mCurrentItem;
863 for (int k = 0; k < adjust; k++) {
866 for (int k = 0; k + adjust < BUFFER_SIZE; k++) {
867 mViewItem[k] = mViewItem[k + adjust];
869 for (int k = BUFFER_SIZE - adjust; k < BUFFER_SIZE; k++) {
871 if (mViewItem[k - 1] != null) {
872 mViewItem[k] = buildItemFromData(mViewItem[k - 1].getId() + 1);
877 for (int k = BUFFER_SIZE - 1; k >= BUFFER_SIZE + adjust; k--) {
880 for (int k = BUFFER_SIZE - 1; k + adjust >= 0; k--) {
881 mViewItem[k] = mViewItem[k + adjust];
883 for (int k = -1 - adjust; k >= 0; k--) {
885 if (mViewItem[k + 1] != null) {
886 mViewItem[k] = buildItemFromData(mViewItem[k + 1].getId() - 1);
891 if (mListener != null) {
892 mListener.onDataFocusChanged(prevDataId, mViewItem[mCurrentItem].getId());
893 final int firstVisible = mViewItem[mCurrentItem].getId() - 2;
894 final int visibleItemCount = firstVisible + BUFFER_SIZE;
895 final int totalItemCount = mDataAdapter.getTotalNumber();
896 mListener.onScroll(firstVisible, visibleItemCount, totalItemCount);
898 zoomAtIndexChanged();
902 * Check the bounds of {@code mCenterX}. Always call this function after: 1.
903 * Any changes to {@code mCenterX}. 2. Any size change of the view items.
905 * @return Whether clamp happened.
907 private boolean clampCenterX() {
908 ViewItem curr = mViewItem[mCurrentItem];
913 boolean stopScroll = false;
914 if (curr.getId() == 1 && mCenterX < curr.getCenterX() && mDataIdOnUserScrolling > 1 &&
915 mDataAdapter.getImageData(0).getViewType() == ImageData.VIEW_TYPE_STICKY &&
916 mController.isScrolling()) {
919 if (curr.getId() == 0 && mCenterX < curr.getCenterX()) {
920 // Stop at the first ViewItem.
924 if (curr.getId() == mDataAdapter.getTotalNumber() - 1
925 && mCenterX > curr.getCenterX()) {
931 mCenterX = curr.getCenterX();
938 * Reorders the child views to be consistent with their data ID. This method
939 * should be called after adding/removing views.
941 private void adjustChildZOrder() {
942 for (int i = BUFFER_SIZE - 1; i >= 0; i--) {
943 if (mViewItem[i] == null) {
946 mViewItem[i].bringViewToFront();
948 // ZoomView is a special case to always be in the front. In L set to
949 // max elevation to make sure ZoomView is above other elevated views.
950 bringChildToFront(mZoomView);
951 if (ApiHelper.isLOrHigher()) {
952 setMaxElevation(mZoomView);
956 @TargetApi(Build.VERSION_CODES.L)
957 private void setMaxElevation(View v) {
958 v.setElevation(Float.MAX_VALUE);
962 * Returns the ID of the current item, or -1 if there is no data.
964 private int getCurrentId() {
965 ViewItem current = mViewItem[mCurrentItem];
966 if (current == null) {
969 return current.getId();
973 * Keep the current item in the center. This functions does not check if the
974 * current item is null.
976 private void snapInCenter() {
977 final ViewItem currItem = mViewItem[mCurrentItem];
978 if (currItem == null) {
981 final int currentViewCenter = currItem.getCenterX();
982 if (mController.isScrolling() || mIsUserScrolling
983 || isCurrentItemCentered()) {
987 int snapInTime = (int) (SNAP_IN_CENTER_TIME_MS
988 * ((float) Math.abs(mCenterX - currentViewCenter))
989 / mDrawArea.width());
990 mController.scrollToPosition(currentViewCenter,
992 if (isViewTypeSticky(currItem) && !mController.isScaling() && mScale != FULL_SCREEN_SCALE) {
993 // Now going to full screen camera
994 mController.goToFullScreen();
999 * Translates the {@link ViewItem} on the left of the current one to match
1000 * the full-screen layout. In full-screen, we show only one {@link ViewItem}
1001 * which occupies the whole screen. The other left ones are put on the left
1002 * side in full scales. Does nothing if there's no next item.
1004 * @param currItem The item ID of the current one to be translated.
1005 * @param drawAreaWidth The width of the current draw area.
1006 * @param scaleFraction A {@code float} between 0 and 1. 0 if the current
1007 * scale is {@code FILM_STRIP_SCALE}. 1 if the current scale is
1008 * {@code FULL_SCREEN_SCALE}.
1010 private void translateLeftViewItem(
1011 int currItem, int drawAreaWidth, float scaleFraction) {
1012 if (currItem < 0 || currItem > BUFFER_SIZE - 1) {
1013 Log.e(TAG, "currItem id out of bound.");
1017 final ViewItem curr = mViewItem[currItem];
1018 final ViewItem next = mViewItem[currItem + 1];
1019 if (curr == null || next == null) {
1020 Log.e(TAG, "Invalid view item (curr or next == null). curr = "
1025 final int currCenterX = curr.getCenterX();
1026 final int nextCenterX = next.getCenterX();
1027 final int translate = (int) ((nextCenterX - drawAreaWidth
1028 - currCenterX) * scaleFraction);
1030 curr.layoutWithTranslationX(mDrawArea, mCenterX, mScale);
1032 curr.setVisibility(VISIBLE);
1034 if (inFullScreen()) {
1035 curr.setTranslationX(translate * (mCenterX - currCenterX) / (nextCenterX - currCenterX));
1037 curr.setTranslationX(translate);
1042 * Fade out the {@link ViewItem} on the right of the current one in
1043 * full-screen layout. Does nothing if there's no previous item.
1045 * @param currItemId The ID of the item to fade.
1047 private void fadeAndScaleRightViewItem(int currItemId) {
1048 if (currItemId < 1 || currItemId > BUFFER_SIZE) {
1049 Log.e(TAG, "currItem id out of bound.");
1053 final ViewItem currItem = mViewItem[currItemId];
1054 final ViewItem prevItem = mViewItem[currItemId - 1];
1055 if (currItem == null || prevItem == null) {
1056 Log.e(TAG, "Invalid view item (curr or prev == null). curr = "
1061 if (currItemId > mCurrentItem + 1) {
1062 // Every item not right next to the mCurrentItem is invisible.
1063 currItem.setVisibility(INVISIBLE);
1066 final int prevCenterX = prevItem.getCenterX();
1067 if (mCenterX <= prevCenterX) {
1068 // Shortcut. If the position is at the center of the previous one,
1069 // set to invisible too.
1070 currItem.setVisibility(INVISIBLE);
1073 final int currCenterX = currItem.getCenterX();
1074 final float fadeDownFraction =
1075 ((float) mCenterX - prevCenterX) / (currCenterX - prevCenterX);
1076 currItem.layoutWithTranslationX(mDrawArea, currCenterX,
1077 FILM_STRIP_SCALE + (1f - FILM_STRIP_SCALE) * fadeDownFraction);
1078 currItem.setAlpha(fadeDownFraction);
1079 currItem.setTranslationX(0);
1080 currItem.setVisibility(VISIBLE);
1083 private void layoutViewItems(boolean layoutChanged) {
1084 if (mViewItem[mCurrentItem] == null ||
1085 mDrawArea.width() == 0 ||
1086 mDrawArea.height() == 0) {
1090 // If the layout changed, we need to adjust the current position so
1091 // that if an item is centered before the change, it's still centered.
1092 if (layoutChanged) {
1093 mViewItem[mCurrentItem].setLeftPosition(
1094 mCenterX - mViewItem[mCurrentItem].getMeasuredWidth() / 2);
1101 * Transformed scale fraction between 0 and 1. 0 if the scale is
1102 * {@link FILM_STRIP_SCALE}. 1 if the scale is {@link FULL_SCREEN_SCALE}
1105 final float scaleFraction = mViewAnimInterpolator.getInterpolation(
1106 (mScale - FILM_STRIP_SCALE) / (FULL_SCREEN_SCALE - FILM_STRIP_SCALE));
1107 final int fullScreenWidth = mDrawArea.width() + mViewGapInPixel;
1109 // Decide the position for all view items on the left and the right
1113 for (int itemID = mCurrentItem - 1; itemID >= 0; itemID--) {
1114 final ViewItem curr = mViewItem[itemID];
1119 // First, layout relatively to the next one.
1120 final int currLeft = mViewItem[itemID + 1].getLeftPosition()
1121 - curr.getMeasuredWidth() - mViewGapInPixel;
1122 curr.setLeftPosition(currLeft);
1125 for (int itemID = mCurrentItem + 1; itemID < BUFFER_SIZE; itemID++) {
1126 final ViewItem curr = mViewItem[itemID];
1131 // First, layout relatively to the previous one.
1132 final ViewItem prev = mViewItem[itemID - 1];
1133 final int currLeft =
1134 prev.getLeftPosition() + prev.getMeasuredWidth()
1136 curr.setLeftPosition(currLeft);
1139 // Special case for the one immediately on the right of the camera
1141 boolean immediateRight =
1142 (mViewItem[mCurrentItem].getId() == 1 &&
1143 mDataAdapter.getImageData(0).getViewType() == ImageData.VIEW_TYPE_STICKY);
1145 // Layout the current ViewItem first.
1146 if (immediateRight) {
1147 // Just do a simple layout without any special translation or
1148 // fading. The implementation in Gallery does not push the first
1149 // photo to the bottom of the camera preview. Simply place the
1150 // photo on the right of the preview.
1151 final ViewItem currItem = mViewItem[mCurrentItem];
1152 currItem.layoutWithTranslationX(mDrawArea, mCenterX, mScale);
1153 currItem.setTranslationX(0f);
1154 currItem.setAlpha(1f);
1155 } else if (scaleFraction == 1f) {
1156 final ViewItem currItem = mViewItem[mCurrentItem];
1157 final int currCenterX = currItem.getCenterX();
1158 if (mCenterX < currCenterX) {
1159 // In full-screen and mCenterX is on the left of the center,
1160 // we draw the current one to "fade down".
1161 fadeAndScaleRightViewItem(mCurrentItem);
1162 } else if (mCenterX > currCenterX) {
1163 // In full-screen and mCenterX is on the right of the center,
1164 // we draw the current one translated.
1165 translateLeftViewItem(mCurrentItem, fullScreenWidth, scaleFraction);
1167 currItem.layoutWithTranslationX(mDrawArea, mCenterX, mScale);
1168 currItem.setTranslationX(0f);
1169 currItem.setAlpha(1f);
1172 final ViewItem currItem = mViewItem[mCurrentItem];
1173 // The normal filmstrip has no translation for the current item. If
1174 // it has translation before, gradually set it to zero.
1175 currItem.setTranslationX(currItem.getTranslationX() * scaleFraction);
1176 currItem.layoutWithTranslationX(mDrawArea, mCenterX, mScale);
1177 if (mViewItem[mCurrentItem - 1] == null) {
1178 currItem.setAlpha(1f);
1180 final int currCenterX = currItem.getCenterX();
1181 final int prevCenterX = mViewItem[mCurrentItem - 1].getCenterX();
1182 final float fadeDownFraction =
1183 ((float) mCenterX - prevCenterX) / (currCenterX - prevCenterX);
1185 (1 - fadeDownFraction) * (1 - scaleFraction) + fadeDownFraction);
1189 // Layout the rest dependent on the current scale.
1191 // Items on the left
1192 for (int itemID = mCurrentItem - 1; itemID >= 0; itemID--) {
1193 final ViewItem curr = mViewItem[itemID];
1197 translateLeftViewItem(itemID, fullScreenWidth, scaleFraction);
1200 // Items on the right
1201 for (int itemID = mCurrentItem + 1; itemID < BUFFER_SIZE; itemID++) {
1202 final ViewItem curr = mViewItem[itemID];
1207 curr.layoutWithTranslationX(mDrawArea, mCenterX, mScale);
1208 if (curr.getId() == 1 && isViewTypeSticky(curr)) {
1209 // Special case for the one next to the camera preview.
1214 if (scaleFraction == 1) {
1215 // It's in full-screen mode.
1216 fadeAndScaleRightViewItem(itemID);
1218 if (curr.getVisibility() == INVISIBLE) {
1219 curr.setVisibility(VISIBLE);
1221 if (itemID == mCurrentItem + 1) {
1222 curr.setAlpha(1f - scaleFraction);
1224 if (scaleFraction == 0f) {
1227 curr.setVisibility(INVISIBLE);
1230 curr.setTranslationX(
1231 (mViewItem[mCurrentItem].getLeftPosition() - curr.getLeftPosition()) *
1239 private boolean isViewTypeSticky(ViewItem item) {
1243 return mDataAdapter.getImageData(item.getId()).getViewType() ==
1244 ImageData.VIEW_TYPE_STICKY;
1248 public void onDraw(Canvas c) {
1249 // TODO: remove layoutViewItems() here.
1250 layoutViewItems(false);
1255 protected void onLayout(boolean changed, int l, int t, int r, int b) {
1258 mDrawArea.right = r - l;
1259 mDrawArea.bottom = b - t;
1260 mZoomView.layout(mDrawArea.left, mDrawArea.top, mDrawArea.right, mDrawArea.bottom);
1261 // TODO: Need a more robust solution to decide when to re-layout
1262 // If in the middle of zooming, only re-layout when the layout has
1264 if (!inZoomView() || changed) {
1266 layoutViewItems(changed);
1271 * Clears the translation and scale that has been set on the view, cancels
1272 * any loading request for image partial decoding, and hides zoom view. This
1273 * is needed for when there is a layout change (e.g. when users re-enter the
1274 * app, or rotate the device, etc).
1276 private void resetZoomView() {
1277 if (!inZoomView()) {
1280 ViewItem current = mViewItem[mCurrentItem];
1281 if (current == null) {
1284 mScale = FULL_SCREEN_SCALE;
1285 mController.cancelZoomAnimation();
1286 mController.cancelFlingAnimation();
1287 current.resetTransform();
1288 mController.cancelLoadingZoomedImage();
1289 mZoomView.setVisibility(GONE);
1290 mController.setSurroundingViewsVisible(true);
1293 private void hideZoomView() {
1295 mController.cancelLoadingZoomedImage();
1296 mZoomView.setVisibility(GONE);
1300 private void slideViewBack(ViewItem item) {
1301 item.animateTranslationX(0, GEOMETRY_ADJUST_TIME_MS, mViewAnimInterpolator);
1302 item.animateTranslationY(0, GEOMETRY_ADJUST_TIME_MS, mViewAnimInterpolator);
1303 item.animateAlpha(1f, GEOMETRY_ADJUST_TIME_MS, mViewAnimInterpolator);
1306 private void animateItemRemoval(int dataID, final ImageData data) {
1307 if (mScale > FULL_SCREEN_SCALE) {
1310 int removedItemId = findItemByDataID(dataID);
1312 // adjust the data id to be consistent
1313 for (int i = 0; i < BUFFER_SIZE; i++) {
1314 if (mViewItem[i] == null || mViewItem[i].getId() <= dataID) {
1317 mViewItem[i].setId(mViewItem[i].getId() - 1);
1319 if (removedItemId == -1) {
1323 final ViewItem removedItem = mViewItem[removedItemId];
1324 final int offsetX = removedItem.getMeasuredWidth() + mViewGapInPixel;
1326 for (int i = removedItemId + 1; i < BUFFER_SIZE; i++) {
1327 if (mViewItem[i] != null) {
1328 mViewItem[i].setLeftPosition(mViewItem[i].getLeftPosition() - offsetX);
1332 if (removedItemId >= mCurrentItem
1333 && mViewItem[removedItemId].getId() < mDataAdapter.getTotalNumber()) {
1334 // Fill the removed item by left shift when the current one or
1335 // anyone on the right is removed, and there's more data on the
1337 for (int i = removedItemId; i < BUFFER_SIZE - 1; i++) {
1338 mViewItem[i] = mViewItem[i + 1];
1341 // pull data out from the DataAdapter for the last one.
1342 int curr = BUFFER_SIZE - 1;
1343 int prev = curr - 1;
1344 if (mViewItem[prev] != null) {
1345 mViewItem[curr] = buildItemFromData(mViewItem[prev].getId() + 1);
1348 // The animation part.
1349 if (inFullScreen()) {
1350 mViewItem[mCurrentItem].setVisibility(VISIBLE);
1351 ViewItem nextItem = mViewItem[mCurrentItem + 1];
1352 if (nextItem != null) {
1353 nextItem.setVisibility(INVISIBLE);
1357 // Translate the views to their original places.
1358 for (int i = removedItemId; i < BUFFER_SIZE; i++) {
1359 if (mViewItem[i] != null) {
1360 mViewItem[i].setTranslationX(offsetX);
1364 // The end of the filmstrip might have been changed.
1365 // The mCenterX might be out of the bound.
1366 ViewItem currItem = mViewItem[mCurrentItem];
1367 if (currItem.getId() == mDataAdapter.getTotalNumber() - 1
1368 && mCenterX > currItem.getCenterX()) {
1369 int adjustDiff = currItem.getCenterX() - mCenterX;
1370 mCenterX = currItem.getCenterX();
1371 for (int i = 0; i < BUFFER_SIZE; i++) {
1372 if (mViewItem[i] != null) {
1373 mViewItem[i].translateXScaledBy(adjustDiff);
1378 // fill the removed place by right shift
1379 mCenterX -= offsetX;
1381 for (int i = removedItemId; i > 0; i--) {
1382 mViewItem[i] = mViewItem[i - 1];
1385 // pull data out from the DataAdapter for the first one.
1387 int next = curr + 1;
1388 if (mViewItem[next] != null) {
1389 mViewItem[curr] = buildItemFromData(mViewItem[next].getId() - 1);
1392 // Translate the views to their original places.
1393 for (int i = removedItemId; i >= 0; i--) {
1394 if (mViewItem[i] != null) {
1395 mViewItem[i].setTranslationX(-offsetX);
1400 int transY = getHeight() / 8;
1401 if (removedItem.getTranslationY() < 0) {
1404 removedItem.animateTranslationY(removedItem.getTranslationY() + transY,
1405 GEOMETRY_ADJUST_TIME_MS, mViewAnimInterpolator);
1406 removedItem.animateAlpha(0f, GEOMETRY_ADJUST_TIME_MS, mViewAnimInterpolator);
1407 postDelayed(new Runnable() {
1410 removedItem.removeViewFromHierarchy(false);
1412 }, GEOMETRY_ADJUST_TIME_MS);
1414 adjustChildZOrder();
1417 // Now, slide every one back.
1418 if (mViewItem[mCurrentItem] == null) {
1421 for (int i = 0; i < BUFFER_SIZE; i++) {
1422 if (mViewItem[i] != null
1423 && mViewItem[i].getTranslationX() != 0f) {
1424 slideViewBack(mViewItem[i]);
1427 if (isCurrentItemCentered() && isViewTypeSticky(mViewItem[mCurrentItem])) {
1428 // Special case for scrolling onto the camera preview after removal.
1429 mController.goToFullScreen();
1433 // returns -1 on failure.
1434 private int findItemByDataID(int dataID) {
1435 for (int i = 0; i < BUFFER_SIZE; i++) {
1436 if (mViewItem[i] != null
1437 && mViewItem[i].getId() == dataID) {
1444 private void updateInsertion(int dataID) {
1445 int insertedItemId = findItemByDataID(dataID);
1446 if (insertedItemId == -1) {
1447 // Not in the current item buffers. Check if it's inserted
1449 if (dataID == mDataAdapter.getTotalNumber() - 1) {
1450 int prev = findItemByDataID(dataID - 1);
1451 if (prev >= 0 && prev < BUFFER_SIZE - 1) {
1452 // The previous data is in the buffer and we still
1453 // have room for the inserted data.
1454 insertedItemId = prev + 1;
1459 // adjust the data id to be consistent
1460 for (int i = 0; i < BUFFER_SIZE; i++) {
1461 if (mViewItem[i] == null || mViewItem[i].getId() < dataID) {
1464 mViewItem[i].setId(mViewItem[i].getId() + 1);
1466 if (insertedItemId == -1) {
1470 final ImageData data = mDataAdapter.getImageData(dataID);
1471 Point dim = CameraUtil
1472 .resizeToFill(data.getWidth(), data.getHeight(), data.getRotation(),
1473 getMeasuredWidth(), getMeasuredHeight());
1474 final int offsetX = dim.x + mViewGapInPixel;
1475 ViewItem viewItem = buildItemFromData(dataID);
1477 if (insertedItemId >= mCurrentItem) {
1478 if (insertedItemId == mCurrentItem) {
1479 viewItem.setLeftPosition(mViewItem[mCurrentItem].getLeftPosition());
1481 // Shift right to make rooms for newly inserted item.
1482 removeItem(BUFFER_SIZE - 1);
1483 for (int i = BUFFER_SIZE - 1; i > insertedItemId; i--) {
1484 mViewItem[i] = mViewItem[i - 1];
1485 if (mViewItem[i] != null) {
1486 mViewItem[i].setTranslationX(-offsetX);
1487 slideViewBack(mViewItem[i]);
1491 // Shift left. Put the inserted data on the left instead of the
1494 if (insertedItemId < 0) {
1498 for (int i = 1; i <= insertedItemId; i++) {
1499 if (mViewItem[i] != null) {
1500 mViewItem[i].setTranslationX(offsetX);
1501 slideViewBack(mViewItem[i]);
1502 mViewItem[i - 1] = mViewItem[i];
1507 mViewItem[insertedItemId] = viewItem;
1508 viewItem.setAlpha(0f);
1509 viewItem.setTranslationY(getHeight() / 8);
1510 slideViewBack(viewItem);
1511 adjustChildZOrder();
1515 private void setDataAdapter(DataAdapter adapter) {
1516 mDataAdapter = adapter;
1517 int maxEdge = (int) (Math.max(this.getHeight(), this.getWidth())
1518 * FILM_STRIP_SCALE);
1519 mDataAdapter.suggestViewSizeBound(maxEdge, maxEdge);
1520 mDataAdapter.setListener(new DataAdapter.Listener() {
1522 public void onDataLoaded() {
1527 public void onDataUpdated(DataAdapter.UpdateReporter reporter) {
1532 public void onDataInserted(int dataId, ImageData data) {
1533 if (mViewItem[mCurrentItem] == null) {
1534 // empty now, simply do a reload.
1537 updateInsertion(dataId);
1539 if (mListener != null) {
1540 mListener.onDataFocusChanged(dataId, getCurrentId());
1545 public void onDataRemoved(int dataId, ImageData data) {
1546 animateItemRemoval(dataId, data);
1547 if (mListener != null) {
1548 mListener.onDataFocusChanged(dataId, getCurrentId());
1554 private boolean inFilmstrip() {
1555 return (mScale == FILM_STRIP_SCALE);
1558 private boolean inFullScreen() {
1559 return (mScale == FULL_SCREEN_SCALE);
1562 private boolean inZoomView() {
1563 return (mScale > FULL_SCREEN_SCALE);
1566 private boolean isCameraPreview() {
1567 return isViewTypeSticky(mViewItem[mCurrentItem]);
1570 private boolean inCameraFullscreen() {
1571 return isDataAtCenter(0) && inFullScreen()
1572 && (isViewTypeSticky(mViewItem[mCurrentItem]));
1576 public boolean onInterceptTouchEvent(MotionEvent ev) {
1577 if (mController.isScrolling()) {
1581 if (ev.getActionMasked() == MotionEvent.ACTION_DOWN) {
1582 mCheckToIntercept = true;
1583 mDown = MotionEvent.obtain(ev);
1584 ViewItem viewItem = mViewItem[mCurrentItem];
1585 // Do not intercept touch if swipe is not enabled
1586 if (viewItem != null && !mDataAdapter.canSwipeInFullScreen(viewItem.getId())) {
1587 mCheckToIntercept = false;
1590 } else if (ev.getActionMasked() == MotionEvent.ACTION_POINTER_DOWN) {
1591 // Do not intercept touch once child is in zoom mode
1592 mCheckToIntercept = false;
1595 if (!mCheckToIntercept) {
1598 if (ev.getEventTime() - ev.getDownTime() > SWIPE_TIME_OUT) {
1601 int deltaX = (int) (ev.getX() - mDown.getX());
1602 int deltaY = (int) (ev.getY() - mDown.getY());
1603 if (ev.getActionMasked() == MotionEvent.ACTION_MOVE
1604 && deltaX < mSlop * (-1)) {
1605 // intercept left swipe
1606 if (Math.abs(deltaX) >= Math.abs(deltaY) * 2) {
1615 public boolean onTouchEvent(MotionEvent ev) {
1616 return mGestureRecognizer.onTouchEvent(ev);
1619 FilmstripGestureRecognizer.Listener getGestureListener() {
1620 return mGestureListener;
1623 private void updateViewItem(int itemID) {
1624 ViewItem item = mViewItem[itemID];
1626 Log.e(TAG, "trying to update an null item");
1629 item.removeViewFromHierarchy(true);
1631 ViewItem newItem = buildItemFromData(item.getId());
1632 if (newItem == null) {
1633 Log.e(TAG, "new item is null");
1634 // keep using the old data.
1635 item.addViewToHierarchy();
1638 newItem.copyAttributes(item);
1639 mViewItem[itemID] = newItem;
1640 mZoomView.resetDecoder();
1642 boolean stopScroll = clampCenterX();
1644 mController.stopScrolling(true);
1646 adjustChildZOrder();
1648 if (mListener != null) {
1649 mListener.onDataUpdated(newItem.getId());
1653 /** Some of the data is changed. */
1654 private void update(DataAdapter.UpdateReporter reporter) {
1656 if (mViewItem[mCurrentItem] == null) {
1661 // Check the current one.
1662 ViewItem curr = mViewItem[mCurrentItem];
1663 int dataId = curr.getId();
1664 if (reporter.isDataRemoved(dataId)) {
1668 if (reporter.isDataUpdated(dataId)) {
1669 updateViewItem(mCurrentItem);
1670 final ImageData data = mDataAdapter.getImageData(dataId);
1671 if (!mIsUserScrolling && !mController.isScrolling()) {
1672 // If there is no scrolling at all, adjust mCenterX to place
1673 // the current item at the center.
1674 Point dim = CameraUtil.resizeToFill(data.getWidth(), data.getHeight(),
1675 data.getRotation(), getMeasuredWidth(), getMeasuredHeight());
1676 mCenterX = curr.getLeftPosition() + dim.x / 2;
1681 for (int i = mCurrentItem - 1; i >= 0; i--) {
1682 curr = mViewItem[i];
1684 dataId = curr.getId();
1685 if (reporter.isDataRemoved(dataId) || reporter.isDataUpdated(dataId)) {
1689 ViewItem next = mViewItem[i + 1];
1691 mViewItem[i] = buildItemFromData(next.getId() - 1);
1697 for (int i = mCurrentItem + 1; i < BUFFER_SIZE; i++) {
1698 curr = mViewItem[i];
1700 dataId = curr.getId();
1701 if (reporter.isDataRemoved(dataId) || reporter.isDataUpdated(dataId)) {
1705 ViewItem prev = mViewItem[i - 1];
1707 mViewItem[i] = buildItemFromData(prev.getId() + 1);
1711 adjustChildZOrder();
1712 // Request a layout to find the measured width/height of the view first.
1714 // Update photo sphere visibility after metadata fully written.
1718 * The whole data might be totally different. Flush all and load from the
1719 * start. Filmstrip will be centered on the first item, i.e. the camera
1722 private void reload() {
1723 mController.stopScrolling(true);
1724 mController.stopScale();
1725 mDataIdOnUserScrolling = 0;
1728 if (mViewItem[mCurrentItem] != null) {
1729 prevId = mViewItem[mCurrentItem].getId();
1732 // Remove all views from the mViewItem buffer, except the camera view.
1733 for (int i = 0; i < mViewItem.length; i++) {
1734 if (mViewItem[i] == null) {
1737 mViewItem[i].removeViewFromHierarchy(false);
1740 // Clear out the mViewItems and rebuild with camera in the center.
1741 Arrays.fill(mViewItem, null);
1742 int dataNumber = mDataAdapter.getTotalNumber();
1743 if (dataNumber == 0) {
1747 mViewItem[mCurrentItem] = buildItemFromData(0);
1748 if (mViewItem[mCurrentItem] == null) {
1751 mViewItem[mCurrentItem].setLeftPosition(0);
1752 for (int i = mCurrentItem + 1; i < BUFFER_SIZE; i++) {
1753 mViewItem[i] = buildItemFromData(mViewItem[i - 1].getId() + 1);
1754 if (mViewItem[i] == null) {
1759 // Ensure that the views in mViewItem will layout the first in the
1760 // center of the display upon a reload.
1762 mScale = FILM_STRIP_SCALE;
1764 adjustChildZOrder();
1767 if (mListener != null) {
1768 mListener.onDataReloaded();
1769 mListener.onDataFocusChanged(prevId, mViewItem[mCurrentItem].getId());
1773 private void promoteData(int itemID, int dataID) {
1774 if (mListener != null) {
1775 mListener.onFocusedDataPromoted(dataID);
1779 private void demoteData(int itemID, int dataID) {
1780 if (mListener != null) {
1781 mListener.onFocusedDataDemoted(dataID);
1785 private void onEnterFilmstrip() {
1786 if (mListener != null) {
1787 mListener.onEnterFilmstrip(getCurrentId());
1791 private void onLeaveFilmstrip() {
1792 if (mListener != null) {
1793 mListener.onLeaveFilmstrip(getCurrentId());
1797 private void onEnterFullScreen() {
1798 mFullScreenUIHidden = false;
1799 if (mListener != null) {
1800 mListener.onEnterFullScreenUiShown(getCurrentId());
1804 private void onLeaveFullScreen() {
1805 if (mListener != null) {
1806 mListener.onLeaveFullScreenUiShown(getCurrentId());
1810 private void onEnterFullScreenUiHidden() {
1811 mFullScreenUIHidden = true;
1812 if (mListener != null) {
1813 mListener.onEnterFullScreenUiHidden(getCurrentId());
1817 private void onLeaveFullScreenUiHidden() {
1818 mFullScreenUIHidden = false;
1819 if (mListener != null) {
1820 mListener.onLeaveFullScreenUiHidden(getCurrentId());
1824 private void onEnterZoomView() {
1825 if (mListener != null) {
1826 mListener.onEnterZoomView(getCurrentId());
1830 private void onLeaveZoomView() {
1831 mController.setSurroundingViewsVisible(true);
1835 * MyController controls all the geometry animations. It passively tells the
1836 * geometry information on demand.
1838 private class MyController implements FilmstripController {
1840 private final ValueAnimator mScaleAnimator;
1841 private ValueAnimator mZoomAnimator;
1842 private AnimatorSet mFlingAnimator;
1844 private final MyScroller mScroller;
1845 private boolean mCanStopScroll;
1847 private final MyScroller.Listener mScrollerListener =
1848 new MyScroller.Listener() {
1850 public void onScrollUpdate(int currX, int currY) {
1853 boolean stopScroll = clampCenterX();
1855 mController.stopScrolling(true);
1861 public void onScrollEnd() {
1862 mCanStopScroll = true;
1863 if (mViewItem[mCurrentItem] == null) {
1867 if (isCurrentItemCentered()
1868 && isViewTypeSticky(mViewItem[mCurrentItem])) {
1869 // Special case for the scrolling end on the camera
1876 private final ValueAnimator.AnimatorUpdateListener mScaleAnimatorUpdateListener =
1877 new ValueAnimator.AnimatorUpdateListener() {
1879 public void onAnimationUpdate(ValueAnimator animation) {
1880 if (mViewItem[mCurrentItem] == null) {
1883 mScale = (Float) animation.getAnimatedValue();
1888 MyController(Context context) {
1889 TimeInterpolator decelerateInterpolator = new DecelerateInterpolator(1.5f);
1890 mScroller = new MyScroller(mActivity,
1891 new Handler(mActivity.getMainLooper()),
1892 mScrollerListener, decelerateInterpolator);
1893 mCanStopScroll = true;
1895 mScaleAnimator = new ValueAnimator();
1896 mScaleAnimator.addUpdateListener(mScaleAnimatorUpdateListener);
1897 mScaleAnimator.setInterpolator(decelerateInterpolator);
1898 mScaleAnimator.addListener(new Animator.AnimatorListener() {
1900 public void onAnimationStart(Animator animator) {
1901 if (mScale == FULL_SCREEN_SCALE) {
1902 onLeaveFullScreen();
1904 if (mScale == FILM_STRIP_SCALE) {
1911 public void onAnimationEnd(Animator animator) {
1912 if (mScale == FULL_SCREEN_SCALE) {
1913 onEnterFullScreen();
1915 if (mScale == FILM_STRIP_SCALE) {
1919 zoomAtIndexChanged();
1923 public void onAnimationCancel(Animator animator) {
1928 public void onAnimationRepeat(Animator animator) {
1935 public void setImageGap(int imageGap) {
1936 FilmstripView.this.setViewGap(imageGap);
1940 public int getCurrentId() {
1941 return FilmstripView.this.getCurrentId();
1945 public void setDataAdapter(DataAdapter adapter) {
1946 FilmstripView.this.setDataAdapter(adapter);
1950 public boolean inFilmstrip() {
1951 return FilmstripView.this.inFilmstrip();
1955 public boolean inFullScreen() {
1956 return FilmstripView.this.inFullScreen();
1960 public boolean isCameraPreview() {
1961 return FilmstripView.this.isCameraPreview();
1965 public boolean inCameraFullscreen() {
1966 return FilmstripView.this.inCameraFullscreen();
1970 public void setListener(FilmstripListener l) {
1971 FilmstripView.this.setListener(l);
1975 public boolean isScrolling() {
1976 return !mScroller.isFinished();
1980 public boolean isScaling() {
1981 return mScaleAnimator.isRunning();
1984 private int estimateMinX(int dataID, int leftPos, int viewWidth) {
1985 return leftPos - (dataID + 100) * (viewWidth + mViewGapInPixel);
1988 private int estimateMaxX(int dataID, int leftPos, int viewWidth) {
1990 + (mDataAdapter.getTotalNumber() - dataID + 100)
1991 * (viewWidth + mViewGapInPixel);
1994 /** Zoom all the way in or out on the image at the given pivot point. */
1995 private void zoomAt(final ViewItem current, final float focusX, final float focusY) {
1996 // End previous zoom animation, if any
1997 if (mZoomAnimator != null) {
1998 mZoomAnimator.end();
2000 // Calculate end scale
2001 final float maxScale = getCurrentDataMaxScale(false);
2002 final float endScale = mScale < maxScale - maxScale * TOLERANCE
2003 ? maxScale : FULL_SCREEN_SCALE;
2005 mZoomAnimator = new ValueAnimator();
2006 mZoomAnimator.setFloatValues(mScale, endScale);
2007 mZoomAnimator.setDuration(ZOOM_ANIMATION_DURATION_MS);
2008 mZoomAnimator.addListener(new Animator.AnimatorListener() {
2010 public void onAnimationStart(Animator animation) {
2011 if (mScale == FULL_SCREEN_SCALE) {
2012 if (mFullScreenUIHidden) {
2013 onLeaveFullScreenUiHidden();
2015 onLeaveFullScreen();
2017 setSurroundingViewsVisible(false);
2018 } else if (inZoomView()) {
2021 cancelLoadingZoomedImage();
2025 public void onAnimationEnd(Animator animation) {
2026 // Make sure animation ends up having the correct scale even
2027 // if it is cancelled before it finishes
2028 if (mScale != endScale) {
2029 current.postScale(focusX, focusY, endScale / mScale, mDrawArea.width(),
2030 mDrawArea.height());
2034 if (inFullScreen()) {
2035 setSurroundingViewsVisible(true);
2036 mZoomView.setVisibility(GONE);
2037 current.resetTransform();
2038 onEnterFullScreenUiHidden();
2040 mController.loadZoomedImage();
2043 mZoomAnimator = null;
2044 zoomAtIndexChanged();
2048 public void onAnimationCancel(Animator animation) {
2053 public void onAnimationRepeat(Animator animation) {
2058 mZoomAnimator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
2060 public void onAnimationUpdate(ValueAnimator animation) {
2061 float newScale = (Float) animation.getAnimatedValue();
2062 float postScale = newScale / mScale;
2064 current.postScale(focusX, focusY, postScale, mDrawArea.width(),
2065 mDrawArea.height());
2068 mZoomAnimator.start();
2072 public void scroll(float deltaX) {
2073 if (!stopScrolling(false)) {
2078 boolean stopScroll = clampCenterX();
2080 mController.stopScrolling(true);
2086 public void fling(float velocityX) {
2087 if (!stopScrolling(false)) {
2090 final ViewItem item = mViewItem[mCurrentItem];
2095 float scaledVelocityX = velocityX / mScale;
2096 if (inFullScreen() && isViewTypeSticky(item) && scaledVelocityX < 0) {
2097 // Swipe left in camera preview.
2102 // Estimation of possible length on the left. To ensure the
2103 // velocity doesn't become too slow eventually, we add a huge number
2104 // to the estimated maximum.
2105 int minX = estimateMinX(item.getId(), item.getLeftPosition(), w);
2106 // Estimation of possible length on the right. Likewise, exaggerate
2107 // the possible maximum too.
2108 int maxX = estimateMaxX(item.getId(), item.getLeftPosition(), w);
2109 mScroller.fling(mCenterX, 0, (int) -velocityX, 0, minX, maxX, 0, 0);
2112 void flingInsideZoomView(float velocityX, float velocityY) {
2113 if (!inZoomView()) {
2117 final ViewItem current = mViewItem[mCurrentItem];
2118 if (current == null) {
2122 final int factor = DECELERATION_FACTOR;
2123 // Deceleration curve for distance:
2124 // S(t) = s + (e - s) * (1 - (1 - t/T) ^ factor)
2125 // Need to find the ending distance (e), so that the starting
2126 // velocity is the velocity of fling.
2127 // Velocity is the derivative of distance
2128 // V(t) = (e - s) * factor * (-1) * (1 - t/T) ^ (factor - 1) * (-1/T)
2129 // = (e - s) * factor * (1 - t/T) ^ (factor - 1) / T
2130 // Since V(0) = V0, we have e = T / factor * V0 + s
2132 // Duration T should be long enough so that at the end of the fling,
2133 // image moves at 1 pixel/s for about P = 50ms = 0.05s
2134 // i.e. V(T - P) = 1
2135 // V(T - P) = V0 * (1 - (T -P) /T) ^ (factor - 1) = 1
2136 // T = P * V0 ^ (1 / (factor -1))
2138 final float velocity = Math.max(Math.abs(velocityX), Math.abs(velocityY));
2139 // Dynamically calculate duration
2140 final float duration = (float) (FLING_COASTING_DURATION_S
2141 * Math.pow(velocity, (1f / (factor - 1f))));
2143 final float translationX = current.getTranslationX() * mScale;
2144 final float translationY = current.getTranslationY() * mScale;
2146 final ValueAnimator decelerationX = ValueAnimator.ofFloat(translationX,
2147 translationX + duration / factor * velocityX);
2148 final ValueAnimator decelerationY = ValueAnimator.ofFloat(translationY,
2149 translationY + duration / factor * velocityY);
2151 decelerationY.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
2153 public void onAnimationUpdate(ValueAnimator animation) {
2154 float transX = (Float) decelerationX.getAnimatedValue();
2155 float transY = (Float) decelerationY.getAnimatedValue();
2157 current.updateTransform(transX, transY, mScale,
2158 mScale, mDrawArea.width(), mDrawArea.height());
2162 mFlingAnimator = new AnimatorSet();
2163 mFlingAnimator.play(decelerationX).with(decelerationY);
2164 mFlingAnimator.setDuration((int) (duration * 1000));
2165 mFlingAnimator.setInterpolator(new TimeInterpolator() {
2167 public float getInterpolation(float input) {
2168 return (float) (1.0f - Math.pow((1.0f - input), factor));
2171 mFlingAnimator.addListener(new Animator.AnimatorListener() {
2172 private boolean mCancelled = false;
2175 public void onAnimationStart(Animator animation) {
2180 public void onAnimationEnd(Animator animation) {
2184 mFlingAnimator = null;
2188 public void onAnimationCancel(Animator animation) {
2193 public void onAnimationRepeat(Animator animation) {
2197 mFlingAnimator.start();
2201 public boolean stopScrolling(boolean forced) {
2202 if (!isScrolling()) {
2204 } else if (!mCanStopScroll && !forced) {
2207 mScroller.forceFinished(true);
2211 private void stopScale() {
2212 mScaleAnimator.cancel();
2216 public void scrollToPosition(int position, int duration, boolean interruptible) {
2217 if (mViewItem[mCurrentItem] == null) {
2220 mCanStopScroll = interruptible;
2221 mScroller.startScroll(mCenterX, 0, position - mCenterX, 0, duration);
2225 public boolean goToNextItem() {
2226 return goToItem(mCurrentItem + 1);
2230 public boolean goToPreviousItem() {
2231 return goToItem(mCurrentItem - 1);
2234 private boolean goToItem(int itemIndex) {
2235 final ViewItem nextItem = mViewItem[itemIndex];
2236 if (nextItem == null) {
2239 stopScrolling(true);
2240 scrollToPosition(nextItem.getCenterX(), GEOMETRY_ADJUST_TIME_MS * 2, false);
2242 if (isViewTypeSticky(mViewItem[mCurrentItem])) {
2243 // Special case when moving from camera preview.
2244 scaleTo(FILM_STRIP_SCALE, GEOMETRY_ADJUST_TIME_MS);
2249 private void scaleTo(float scale, int duration) {
2250 if (mViewItem[mCurrentItem] == null) {
2254 mScaleAnimator.setDuration(duration);
2255 mScaleAnimator.setFloatValues(mScale, scale);
2256 mScaleAnimator.start();
2260 public void goToFilmstrip() {
2261 if (mViewItem[mCurrentItem] == null) {
2264 if (mScale == FILM_STRIP_SCALE) {
2267 scaleTo(FILM_STRIP_SCALE, GEOMETRY_ADJUST_TIME_MS);
2269 final ViewItem currItem = mViewItem[mCurrentItem];
2270 final ViewItem nextItem = mViewItem[mCurrentItem + 1];
2271 if (currItem.getId() == 0 && isViewTypeSticky(currItem) && nextItem != null) {
2272 // Deal with the special case of swiping in camera preview.
2273 scrollToPosition(nextItem.getCenterX(), GEOMETRY_ADJUST_TIME_MS, false);
2276 if (mScale == FILM_STRIP_SCALE) {
2282 public void goToFullScreen() {
2283 if (inFullScreen()) {
2287 scaleTo(FULL_SCREEN_SCALE, GEOMETRY_ADJUST_TIME_MS);
2290 private void cancelFlingAnimation() {
2291 // Cancels flinging for zoomed images
2292 if (isFlingAnimationRunning()) {
2293 mFlingAnimator.cancel();
2297 private void cancelZoomAnimation() {
2298 if (isZoomAnimationRunning()) {
2299 mZoomAnimator.cancel();
2303 private void setSurroundingViewsVisible(boolean visible) {
2304 // Hide everything on the left
2305 // TODO: Need to find a better way to toggle the visibility of views
2306 // around the current view.
2307 for (int i = 0; i < mCurrentItem; i++) {
2308 if (i == mCurrentItem || mViewItem[i] == null) {
2311 mViewItem[i].setVisibility(visible ? VISIBLE : INVISIBLE);
2315 private Uri getCurrentUri() {
2316 ViewItem curr = mViewItem[mCurrentItem];
2320 return mDataAdapter.getImageData(curr.getId()).getUri();
2324 * Here we only support up to 1:1 image zoom (i.e. a 100% view of the
2325 * actual pixels). The max scale that we can apply on the view should
2326 * make the view same size as the image, in pixels.
2328 private float getCurrentDataMaxScale(boolean allowOverScale) {
2329 ViewItem curr = mViewItem[mCurrentItem];
2331 return FULL_SCREEN_SCALE;
2333 ImageData imageData = mDataAdapter.getImageData(curr.getId());
2334 if (imageData == null || !imageData.isUIActionSupported(ImageData.ACTION_ZOOM)) {
2335 return FULL_SCREEN_SCALE;
2337 float imageWidth = imageData.getWidth();
2338 if (imageData.getRotation() == 90
2339 || imageData.getRotation() == 270) {
2340 imageWidth = imageData.getHeight();
2342 float scale = imageWidth / curr.getWidth();
2343 if (allowOverScale) {
2344 // In addition to the scale we apply to the view for 100% view
2345 // (i.e. each pixel on screen corresponds to a pixel in image)
2346 // we allow scaling beyond that for better detail viewing.
2347 scale *= mOverScaleFactor;
2352 private void loadZoomedImage() {
2353 if (!inZoomView()) {
2356 ViewItem curr = mViewItem[mCurrentItem];
2360 ImageData imageData = mDataAdapter.getImageData(curr.getId());
2361 if (!imageData.isUIActionSupported(ImageData.ACTION_ZOOM)) {
2364 Uri uri = getCurrentUri();
2365 RectF viewRect = curr.getViewRect();
2366 if (uri == null || uri == Uri.EMPTY) {
2369 int orientation = imageData.getRotation();
2370 mZoomView.loadBitmap(uri, orientation, viewRect);
2373 private void cancelLoadingZoomedImage() {
2374 mZoomView.cancelPartialDecodingTask();
2378 public void goToFirstItem() {
2379 if (mViewItem[mCurrentItem] == null) {
2383 // TODO: animate to camera if it is still in the mViewItem buffer
2384 // versus a full reload which will perform an immediate transition
2388 public boolean inZoomView() {
2389 return FilmstripView.this.inZoomView();
2392 public boolean isFlingAnimationRunning() {
2393 return mFlingAnimator != null && mFlingAnimator.isRunning();
2396 public boolean isZoomAnimationRunning() {
2397 return mZoomAnimator != null && mZoomAnimator.isRunning();
2401 private boolean isCurrentItemCentered() {
2402 return mViewItem[mCurrentItem].getCenterX() == mCenterX;
2405 private static class MyScroller {
2406 public interface Listener {
2407 public void onScrollUpdate(int currX, int currY);
2409 public void onScrollEnd();
2412 private final Handler mHandler;
2413 private final Listener mListener;
2415 private final Scroller mScroller;
2417 private final ValueAnimator mXScrollAnimator;
2418 private final Runnable mScrollChecker = new Runnable() {
2421 boolean newPosition = mScroller.computeScrollOffset();
2423 mListener.onScrollEnd();
2426 mListener.onScrollUpdate(mScroller.getCurrX(), mScroller.getCurrY());
2427 mHandler.removeCallbacks(this);
2428 mHandler.post(this);
2432 private final ValueAnimator.AnimatorUpdateListener mXScrollAnimatorUpdateListener =
2433 new ValueAnimator.AnimatorUpdateListener() {
2435 public void onAnimationUpdate(ValueAnimator animation) {
2436 mListener.onScrollUpdate((Integer) animation.getAnimatedValue(), 0);
2440 private final Animator.AnimatorListener mXScrollAnimatorListener =
2441 new Animator.AnimatorListener() {
2443 public void onAnimationCancel(Animator animation) {
2448 public void onAnimationEnd(Animator animation) {
2449 mListener.onScrollEnd();
2453 public void onAnimationRepeat(Animator animation) {
2458 public void onAnimationStart(Animator animation) {
2463 public MyScroller(Context ctx, Handler handler, Listener listener,
2464 TimeInterpolator interpolator) {
2466 mListener = listener;
2467 mScroller = new Scroller(ctx);
2468 mXScrollAnimator = new ValueAnimator();
2469 mXScrollAnimator.addUpdateListener(mXScrollAnimatorUpdateListener);
2470 mXScrollAnimator.addListener(mXScrollAnimatorListener);
2471 mXScrollAnimator.setInterpolator(interpolator);
2475 int startX, int startY,
2476 int velocityX, int velocityY,
2478 int minY, int maxY) {
2479 mScroller.fling(startX, startY, velocityX, velocityY, minX, maxX, minY, maxY);
2483 public void startScroll(int startX, int startY, int dx, int dy) {
2484 mScroller.startScroll(startX, startY, dx, dy);
2488 /** Only starts and updates scroll in x-axis. */
2489 public void startScroll(int startX, int startY, int dx, int dy, int duration) {
2490 mXScrollAnimator.cancel();
2491 mXScrollAnimator.setDuration(duration);
2492 mXScrollAnimator.setIntValues(startX, startX + dx);
2493 mXScrollAnimator.start();
2496 public boolean isFinished() {
2497 return (mScroller.isFinished() && !mXScrollAnimator.isRunning());
2500 public void forceFinished(boolean finished) {
2501 mScroller.forceFinished(finished);
2503 mXScrollAnimator.cancel();
2507 private void runChecker() {
2508 if (mHandler == null || mListener == null) {
2511 mHandler.removeCallbacks(mScrollChecker);
2512 mHandler.post(mScrollChecker);
2516 private class MyGestureReceiver implements FilmstripGestureRecognizer.Listener {
2518 private static final int SCROLL_DIR_NONE = 0;
2519 private static final int SCROLL_DIR_VERTICAL = 1;
2520 private static final int SCROLL_DIR_HORIZONTAL = 2;
2521 // Indicating the current trend of scaling is up (>1) or down (<1).
2522 private float mScaleTrend;
2523 private float mMaxScale;
2524 private int mScrollingDirection = SCROLL_DIR_NONE;
2525 private long mLastDownTime;
2526 private float mLastDownY;
2529 public boolean onSingleTapUp(float x, float y) {
2530 ViewItem centerItem = mViewItem[mCurrentItem];
2531 if (inFilmstrip()) {
2532 if (centerItem != null && centerItem.areaContains(x, y)) {
2533 mController.goToFullScreen();
2536 } else if (inFullScreen()) {
2537 if (mFullScreenUIHidden) {
2538 onLeaveFullScreenUiHidden();
2539 onEnterFullScreen();
2541 onLeaveFullScreen();
2542 onEnterFullScreenUiHidden();
2550 public boolean onDoubleTap(float x, float y) {
2551 ViewItem current = mViewItem[mCurrentItem];
2552 if (current == null) {
2555 if (inFilmstrip()) {
2556 mController.goToFullScreen();
2558 } else if (mScale < FULL_SCREEN_SCALE || inCameraFullscreen()) {
2561 if (!mController.stopScrolling(false)) {
2564 if (inFullScreen()) {
2565 mController.zoomAt(current, x, y);
2566 checkItemAtMaxSize();
2568 } else if (mScale > FULL_SCREEN_SCALE) {
2570 mController.zoomAt(current, x, y);
2576 public boolean onDown(float x, float y) {
2577 mLastDownTime = SystemClock.uptimeMillis();
2579 mController.cancelFlingAnimation();
2580 if (!mController.stopScrolling(false)) {
2588 public boolean onUp(float x, float y) {
2589 ViewItem currItem = mViewItem[mCurrentItem];
2590 if (currItem == null) {
2593 if (mController.isZoomAnimationRunning() || mController.isFlingAnimationRunning()) {
2597 mController.loadZoomedImage();
2600 float promoteHeight = getHeight() * PROMOTE_HEIGHT_RATIO;
2601 float velocityPromoteHeight = getHeight() * VELOCITY_PROMOTE_HEIGHT_RATIO;
2602 mIsUserScrolling = false;
2603 mScrollingDirection = SCROLL_DIR_NONE;
2604 // Finds items promoted/demoted.
2605 float speedY = Math.abs(y - mLastDownY)
2606 / (SystemClock.uptimeMillis() - mLastDownTime);
2607 for (int i = 0; i < BUFFER_SIZE; i++) {
2608 if (mViewItem[i] == null) {
2611 float transY = mViewItem[i].getTranslationY();
2615 int id = mViewItem[i].getId();
2617 if (mDataAdapter.getImageData(id)
2618 .isUIActionSupported(ImageData.ACTION_DEMOTE)
2619 && ((transY > promoteHeight)
2620 || (transY > velocityPromoteHeight && speedY > PROMOTE_VELOCITY))) {
2622 } else if (mDataAdapter.getImageData(id)
2623 .isUIActionSupported(ImageData.ACTION_PROMOTE)
2624 && (transY < -promoteHeight
2625 || (transY < -velocityPromoteHeight && speedY > PROMOTE_VELOCITY))) {
2628 // put the view back.
2629 slideViewBack(mViewItem[i]);
2633 // The data might be changed. Re-check.
2634 currItem = mViewItem[mCurrentItem];
2635 if (currItem == null) {
2639 int currId = currItem.getId();
2640 if (mCenterX > currItem.getCenterX() + CAMERA_PREVIEW_SWIPE_THRESHOLD && currId == 0 &&
2641 isViewTypeSticky(currItem) && mDataIdOnUserScrolling == 0) {
2642 mController.goToFilmstrip();
2643 // Special case to go from camera preview to the next photo.
2644 if (mViewItem[mCurrentItem + 1] != null) {
2645 mController.scrollToPosition(
2646 mViewItem[mCurrentItem + 1].getCenterX(),
2647 GEOMETRY_ADJUST_TIME_MS, false);
2653 if (isCurrentItemCentered() && currId == 0 && isViewTypeSticky(currItem)) {
2654 mController.goToFullScreen();
2656 if (mDataIdOnUserScrolling == 0 && currId != 0) {
2657 // Special case to go to filmstrip when the user scroll away
2658 // from the camera preview and the current one is not the
2660 mController.goToFilmstrip();
2661 mDataIdOnUserScrolling = currId;
2669 public void onLongPress(float x, float y) {
2670 final int dataId = getCurrentId();
2674 mListener.onFocusedDataLongPressed(dataId);
2678 public boolean onScroll(float x, float y, float dx, float dy) {
2679 final ViewItem currItem = mViewItem[mCurrentItem];
2680 if (currItem == null) {
2683 if (inFullScreen() && !mDataAdapter.canSwipeInFullScreen(currItem.getId())) {
2687 // When image is zoomed in to be bigger than the screen
2689 ViewItem curr = mViewItem[mCurrentItem];
2690 float transX = curr.getTranslationX() * mScale - dx;
2691 float transY = curr.getTranslationY() * mScale - dy;
2692 curr.updateTransform(transX, transY, mScale, mScale, mDrawArea.width(),
2693 mDrawArea.height());
2696 int deltaX = (int) (dx / mScale);
2697 // Forces the current scrolling to stop.
2698 mController.stopScrolling(true);
2699 if (!mIsUserScrolling) {
2700 mIsUserScrolling = true;
2701 mDataIdOnUserScrolling = mViewItem[mCurrentItem].getId();
2703 if (inFilmstrip()) {
2704 // Disambiguate horizontal/vertical first.
2705 if (mScrollingDirection == SCROLL_DIR_NONE) {
2706 mScrollingDirection = (Math.abs(dx) > Math.abs(dy)) ? SCROLL_DIR_HORIZONTAL :
2707 SCROLL_DIR_VERTICAL;
2709 if (mScrollingDirection == SCROLL_DIR_HORIZONTAL) {
2710 if (mCenterX == currItem.getCenterX() && currItem.getId() == 0 && dx < 0) {
2711 // Already at the beginning, don't process the swipe.
2712 mIsUserScrolling = false;
2713 mScrollingDirection = SCROLL_DIR_NONE;
2716 mController.scroll(deltaX);
2718 // Vertical part. Promote or demote.
2720 Rect hitRect = new Rect();
2721 for (; hit < BUFFER_SIZE; hit++) {
2722 if (mViewItem[hit] == null) {
2725 mViewItem[hit].getHitRect(hitRect);
2726 if (hitRect.contains((int) x, (int) y)) {
2730 if (hit == BUFFER_SIZE) {
2735 ImageData data = mDataAdapter.getImageData(mViewItem[hit].getId());
2736 float transY = mViewItem[hit].getTranslationY() - dy / mScale;
2737 if (!data.isUIActionSupported(ImageData.ACTION_DEMOTE) &&
2741 if (!data.isUIActionSupported(ImageData.ACTION_PROMOTE) &&
2745 mViewItem[hit].setTranslationY(transY);
2747 } else if (inFullScreen()) {
2748 if (mViewItem[mCurrentItem] == null || (deltaX < 0 && mCenterX <=
2749 currItem.getCenterX() && currItem.getId() == 0)) {
2752 // Multiplied by 1.2 to make it more easy to swipe.
2753 mController.scroll((int) (deltaX * 1.2));
2761 public boolean onFling(float velocityX, float velocityY) {
2762 final ViewItem currItem = mViewItem[mCurrentItem];
2763 if (currItem == null) {
2766 if (!mDataAdapter.canSwipeInFullScreen(currItem.getId())) {
2770 // Fling within the zoomed image
2771 mController.flingInsideZoomView(velocityX, velocityY);
2774 if (Math.abs(velocityX) < Math.abs(velocityY)) {
2775 // ignore vertical fling.
2779 // In full-screen, fling of a velocity above a threshold should go
2780 // to the next/prev photos
2781 if (mScale == FULL_SCREEN_SCALE) {
2782 int currItemCenterX = currItem.getCenterX();
2784 if (velocityX > 0) { // left
2785 if (mCenterX > currItemCenterX) {
2786 // The visually previous item is actually the current
2788 mController.scrollToPosition(
2789 currItemCenterX, GEOMETRY_ADJUST_TIME_MS, true);
2792 ViewItem prevItem = mViewItem[mCurrentItem - 1];
2793 if (prevItem == null) {
2796 mController.scrollToPosition(
2797 prevItem.getCenterX(), GEOMETRY_ADJUST_TIME_MS, true);
2799 if (mController.stopScrolling(false)) {
2800 if (mCenterX < currItemCenterX) {
2801 // The visually next item is actually the current
2803 mController.scrollToPosition(
2804 currItemCenterX, GEOMETRY_ADJUST_TIME_MS, true);
2807 final ViewItem nextItem = mViewItem[mCurrentItem + 1];
2808 if (nextItem == null) {
2811 mController.scrollToPosition(
2812 nextItem.getCenterX(), GEOMETRY_ADJUST_TIME_MS, true);
2813 if (isViewTypeSticky(currItem)) {
2814 mController.goToFilmstrip();
2820 if (mScale == FILM_STRIP_SCALE) {
2821 mController.fling(velocityX);
2827 public boolean onScaleBegin(float focusX, float focusY) {
2828 if (inCameraFullscreen()) {
2834 // If the image is smaller than screen size, we should allow to zoom
2835 // in to full screen size
2836 mMaxScale = Math.max(mController.getCurrentDataMaxScale(true), FULL_SCREEN_SCALE);
2841 public boolean onScale(float focusX, float focusY, float scale) {
2842 if (inCameraFullscreen()) {
2846 mScaleTrend = mScaleTrend * 0.3f + scale * 0.7f;
2847 float newScale = mScale * scale;
2848 if (mScale < FULL_SCREEN_SCALE && newScale < FULL_SCREEN_SCALE) {
2849 if (newScale <= FILM_STRIP_SCALE) {
2850 newScale = FILM_STRIP_SCALE;
2852 // Scaled view is smaller than or equal to screen size both
2853 // before and after scaling
2854 if (mScale != newScale) {
2855 if (mScale == FILM_STRIP_SCALE) {
2858 if (newScale == FILM_STRIP_SCALE) {
2864 } else if (mScale < FULL_SCREEN_SCALE && newScale >= FULL_SCREEN_SCALE) {
2865 // Going from smaller than screen size to bigger than or equal
2867 if (mScale == FILM_STRIP_SCALE) {
2870 mScale = FULL_SCREEN_SCALE;
2871 onEnterFullScreen();
2872 mController.setSurroundingViewsVisible(false);
2874 } else if (mScale >= FULL_SCREEN_SCALE && newScale < FULL_SCREEN_SCALE) {
2875 // Going from bigger than or equal to screen size to smaller
2877 if (inFullScreen()) {
2878 if (mFullScreenUIHidden) {
2879 onLeaveFullScreenUiHidden();
2881 onLeaveFullScreen();
2890 // Scaled view bigger than or equal to screen size both before
2891 // and after scaling
2892 if (!inZoomView()) {
2893 mController.setSurroundingViewsVisible(false);
2895 ViewItem curr = mViewItem[mCurrentItem];
2896 // Make sure the image is not overly scaled
2897 newScale = Math.min(newScale, mMaxScale);
2898 if (newScale == mScale) {
2901 float postScale = newScale / mScale;
2902 curr.postScale(focusX, focusY, postScale, mDrawArea.width(), mDrawArea.height());
2904 if (mScale == FULL_SCREEN_SCALE) {
2905 onEnterFullScreen();
2909 checkItemAtMaxSize();
2915 public void onScaleEnd() {
2916 zoomAtIndexChanged();
2917 if (mScale > FULL_SCREEN_SCALE + TOLERANCE) {
2920 mController.setSurroundingViewsVisible(true);
2921 if (mScale <= FILM_STRIP_SCALE + TOLERANCE) {
2922 mController.goToFilmstrip();
2923 } else if (mScaleTrend > 1f || mScale > FULL_SCREEN_SCALE - TOLERANCE) {
2925 mScale = FULL_SCREEN_SCALE;
2928 mController.goToFullScreen();
2930 mController.goToFilmstrip();