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/*
* Copyright (C) 2013 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.android.camera.ui;
import android.animation.Animator;
import android.animation.TimeInterpolator;
import android.animation.ValueAnimator;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Rect;
import android.graphics.RectF;
import android.net.Uri;
import android.util.AttributeSet;
import android.util.Log;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewGroup;
import android.view.animation.AccelerateInterpolator;
import android.view.animation.DecelerateInterpolator;
import android.widget.Scroller;
import com.android.camera.CameraActivity;
import com.android.camera.data.LocalData;
import com.android.camera.ui.FilmStripView.ImageData.PanoramaSupportCallback;
import com.android.camera.ui.FilmstripBottomControls.BottomControlsListener;
import com.android.camera.util.PhotoSphereHelper.PanoramaViewHelper;
import com.android.camera2.R;
import java.util.Arrays;
public class FilmStripView extends ViewGroup implements BottomControlsListener {
private static final String TAG = "CAM_FilmStripView";
private static final int BUFFER_SIZE = 5;
private static final int GEOMETRY_ADJUST_TIME_MS = 400;
private static final int SNAP_IN_CENTER_TIME_MS = 600;
private static final int ZOOM_ANIMATION_DURATION_MS = 200;
private static final float FILM_STRIP_SCALE = 0.6f;
private static final float FULL_SCREEN_SCALE = 1f;
private static final float TOLERANCE = 0.1f;
// Only check for intercepting touch events within first 500ms
private static final int SWIPE_TIME_OUT = 500;
private CameraActivity mActivity;
private FilmStripGestureRecognizer mGestureRecognizer;
private DataAdapter mDataAdapter;
private int mViewGap;
private final Rect mDrawArea = new Rect();
private final int mCurrentItem = (BUFFER_SIZE - 1) / 2;
private float mScale;
private MyController mController;
private int mCenterX = -1;
private ViewItem[] mViewItem = new ViewItem[BUFFER_SIZE];
private Listener mListener;
private ZoomView mZoomView = null;
private MotionEvent mDown;
private boolean mCheckToIntercept = true;
private View mCameraView;
private int mSlop;
private TimeInterpolator mViewAnimInterpolator;
private FilmstripBottomControls mBottomControls;
private PanoramaViewHelper mPanoramaViewHelper;
private long mLastItemId = -1;
// This is used to resolve the misalignment problem when the device
// orientation is changed. If the current item is in fullscreen, it might
// be shifted because mCenterX is not adjusted with the orientation.
// Set this to true when onSizeChanged is called to make sure we adjust
// mCenterX accordingly.
private boolean mAnchorPending;
// This is true if and only if the user is scrolling,
private boolean mIsUserScrolling;
/**
* Common interface for all images in the filmstrip.
*/
public interface ImageData {
/**
* Interface that is used to tell the caller whether an image is a photo
* sphere.
*/
public static interface PanoramaSupportCallback {
/**
* Called then photo sphere info has been loaded.
*
* @param isPanorama whether the image is a valid photo sphere
* @param isPanorama360 whether the photo sphere is a full 360
* degree horizontal panorama
*/
void panoramaInfoAvailable(boolean isPanorama,
boolean isPanorama360);
}
// View types.
public static final int TYPE_NONE = 0;
public static final int TYPE_STICKY_VIEW = 1;
public static final int TYPE_REMOVABLE_VIEW = 2;
// Actions allowed to be performed on the image data.
// The actions are defined bit-wise so we can use bit operations like
// | and &.
public static final int ACTION_NONE = 0;
public static final int ACTION_PROMOTE = 1;
public static final int ACTION_DEMOTE = (1 << 1);
/**
* For image data that supports zoom, it should also provide a valid
* content uri.
*/
public static final int ACTION_ZOOM = (1 << 2);
/**
* SIZE_FULL can be returned by {@link ImageData#getWidth()} and
* {@link ImageData#getHeight()}. When SIZE_FULL is returned for
* width/height, it means the the width or height will be disregarded
* when deciding the view size of this ImageData, just use full screen
* size.
*/
public static final int SIZE_FULL = -2;
/**
* Returns the width of the image. The final layout of the view returned
* by {@link DataAdapter#getView(android.content.Context, int)} will
* preserve the aspect ratio of
* {@link com.android.camera.ui.FilmStripView.ImageData#getWidth()} and
* {@link com.android.camera.ui.FilmStripView.ImageData#getHeight()}.
*/
public int getWidth();
/**
* Returns the width of the image. The final layout of the view returned
* by {@link DataAdapter#getView(android.content.Context, int)} will
* preserve the aspect ratio of
* {@link com.android.camera.ui.FilmStripView.ImageData#getWidth()} and
* {@link com.android.camera.ui.FilmStripView.ImageData#getHeight()}.
*/
public int getHeight();
/** Returns the image data type */
public int getViewType();
/**
* Returns the coordinates of this item.
*
* @return A 2-element array containing {latitude, longitude}, or null,
* if no position is known for this item.
*/
public double[] getLatLong();
/**
* Checks if the UI action is supported.
*
* @param action The UI actions to check.
* @return {@code false} if at least one of the actions is not
* supported. {@code true} otherwise.
*/
public boolean isUIActionSupported(int action);
/**
* Gives the data a hint when its view is going to be displayed.
* {@code FilmStripView} should always call this function before showing
* its corresponding view every time.
*/
public void prepare();
/**
* Gives the data a hint when its view is going to be removed from the
* view hierarchy. {@code FilmStripView} should always call this
* function after its corresponding view is removed from the view
* hierarchy.
*/
public void recycle();
/**
* Asynchronously checks if the image is a photo sphere. Notified the
* callback when the results are available.
*/
public void isPhotoSphere(Context context, PanoramaSupportCallback callback);
/**
* If the item is a valid photo sphere panorama, this method will launch
* the viewer.
*/
public void viewPhotoSphere(PanoramaViewHelper helper);
/** Whether this item is a photo. */
public boolean isPhoto();
/**
* Returns the content URI of this data item.
*
* @return {@code Uri.EMPTY} if not valid.
*/
public Uri getContentUri();
}
/**
* An interfaces which defines the interactions between the
* {@link ImageData} and the {@link FilmStripView}.
*/
public interface DataAdapter {
/**
* An interface which defines the update report used to return to the
* {@link com.android.camera.ui.FilmStripView.Listener}.
*/
public interface UpdateReporter {
/** Checks if the data of dataID is removed. */
public boolean isDataRemoved(int dataID);
/** Checks if the data of dataID is updated. */
public boolean isDataUpdated(int dataID);
}
/**
* An interface which defines the listener for data events over
* {@link ImageData}. Usually {@link FilmStripView} itself.
*/
public interface Listener {
// Called when the whole data loading is done. No any assumption
// on previous data.
public void onDataLoaded();
// Only some of the data is changed. The listener should check
// if any thing needs to be updated.
public void onDataUpdated(UpdateReporter reporter);
public void onDataInserted(int dataID, ImageData data);
public void onDataRemoved(int dataID, ImageData data);
}
/** Returns the total number of image data */
public int getTotalNumber();
/**
* Returns the view to visually present the image data.
*
* @param context The {@link Context} to create the view.
* @param dataID The ID of the image data to be presented.
* @return The view representing the image data. Null if unavailable or
* the {@code dataID} is out of range.
*/
public View getView(Context context, int dataID);
/**
* Returns the {@link ImageData} specified by the ID.
*
* @param dataID The ID of the {@link ImageData}.
* @return The specified {@link ImageData}. Null if not available.
*/
public ImageData getImageData(int dataID);
/**
* Suggests the data adapter the maximum possible size of the layout so
* the {@link DataAdapter} can optimize the view returned for the
* {@link ImageData}.
*
* @param w Maximum width.
* @param h Maximum height.
*/
public void suggestViewSizeBound(int w, int h);
/**
* Sets the listener for data events over the ImageData.
*
* @param listener The listener to use.
*/
public void setListener(Listener listener);
/**
* Returns {@code true} if the view of the data can be moved by swipe
* gesture when in full-screen.
*
* @param dataID The ID of the data.
* @return {@code true} if the view can be moved, {@code false}
* otherwise.
*/
public boolean canSwipeInFullScreen(int dataID);
}
/**
* An interface which defines the FilmStripView UI action listener.
*/
public interface Listener {
/**
* Callback when the data is promoted.
*
* @param dataID The ID of the promoted data.
*/
public void onDataPromoted(int dataID);
/**
* Callback when the data is demoted.
*
* @param dataID The ID of the demoted data.
*/
public void onDataDemoted(int dataID);
/**
* The callback when the item enters/leaves full-screen. TODO: Call this
* function actually.
*
* @param dataID The ID of the image data.
* @param fullScreen {@code true} if the data is entering full-screen.
* {@code false} otherwise.
*/
public void onDataFullScreenChange(int dataID, boolean fullScreen);
/**
* Callback when entering/leaving camera mode.
*
* @param toCamera {@code true} if entering camera mode. Otherwise,
* {@code false}
*/
public void onSwitchMode(boolean toCamera);
/**
* The callback when the item is centered/off-centered.
*
* @param dataID The ID of the image data.
* @param current {@code true} if the data is the current one.
* {@code false} otherwise.
*/
public void onCurrentDataChanged(int dataID, boolean current);
/**
* Toggles the visibility of the ActionBar.
*
* @return The ActionBar visibility after the toggle.
*/
public boolean onToggleActionBarVisibility();
}
/**
* An interface which defines the controller of {@link FilmStripView}.
*/
public interface Controller {
public boolean isScaling();
public void scroll(float deltaX);
public void fling(float velocity);
public void scrollToPosition(int position, int duration, boolean interruptible);
public boolean goToNextItem();
public boolean stopScrolling();
public boolean isScrolling();
public void goToFirstItem();
public void goToFilmStrip();
public void goToFullScreen();
}
/**
* A helper class to tract and calculate the view coordination.
*/
private static class ViewItem {
private int mDataID;
/** The position of the left of the view in the whole filmstrip. */
private int mLeftPosition;
private View mView;
private RectF mViewArea;
/**
* Constructor.
*
* @param id The id of the data from {@link DataAdapter}.
* @param v The {@code View} representing the data.
*/
public ViewItem(int id, View v) {
v.setPivotX(0f);
v.setPivotY(0f);
mDataID = id;
mView = v;
mLeftPosition = -1;
mViewArea = new RectF();
}
/** Returns the data id from {@link DataAdapter}. */
public int getID() {
return mDataID;
}
/** Sets the data id from {@link DataAdapter}. */
public void setID(int id) {
mDataID = id;
}
/** Sets the left position of the view in the whole filmstrip. */
public void setLeftPosition(int pos) {
mLeftPosition = pos;
}
/** Returns the left position of the view in the whole filmstrip. */
public int getLeftPosition() {
return mLeftPosition;
}
/** Returns the translation of Y regarding the view scale. */
public float getScaledTranslationY(float scale) {
return mView.getTranslationY() / scale;
}
/** Returns the translation of X regarding the view scale. */
public float getScaledTranslationX(float scale) {
return mView.getTranslationX() / scale;
}
/**
* The horizontal location of this view relative to its left position.
* This position is post-layout, in addition to wherever the object's
* layout placed it.
*
* @return The horizontal position of this view relative to its left position, in pixels.
*/
public float getTranslationX() {
return mView.getTranslationX();
}
/**
* The vertical location of this view relative to its top position.
* This position is post-layout, in addition to wherever the object's
* layout placed it.
*
* @return The vertical position of this view relative to its top position,
* in pixels.
*/
public float getTranslationY() {
return mView.getTranslationY();
}
/** Sets the translation of Y regarding the view scale. */
public void setTranslationY(float transY, float scale) {
mView.setTranslationY(transY * scale);
}
/** Sets the translation of X regarding the view scale. */
public void setTranslationX(float transX, float scale) {
mView.setTranslationX(transX * scale);
}
/** Adjusts the translation of X regarding the view scale. */
public void translateXBy(float transX, float scale) {
mView.setTranslationX(mView.getTranslationX() + transX * scale);
}
public int getCenterX() {
return mLeftPosition + mView.getWidth() / 2;
}
/** Gets the view representing the data. */
public View getView() {
return mView;
}
/**
* The visual x position of this view, in pixels.
*/
public float getX() {
return mView.getX();
}
/**
* The visual y position of this view, in pixels.
*/
public float getY() {
return mView.getY();
}
private void layoutAt(int left, int top) {
mView.layout(left, top, left + mView.getMeasuredWidth(),
top + mView.getMeasuredHeight());
}
/**
* The bounding rect of the view.
*/
public RectF getViewRect() {
RectF r = new RectF();
r.left = mView.getX();
r.top = mView.getY();
r.right = r.left + mView.getWidth() * mView.getScaleX();
r.bottom = r.top + mView.getHeight() * mView.getScaleY();
return r;
}
/**
* Layouts the view in the area assuming the center of the area is at a
* specific point of the whole filmstrip.
*
* @param drawArea The area when filmstrip will show in.
* @param refCenter The absolute X coordination in the whole filmstrip
* of the center of {@code drawArea}.
* @param scale The current scale of the filmstrip.
*/
public void layoutIn(Rect drawArea, int refCenter, float scale) {
int left = (int) (drawArea.centerX() + (mLeftPosition - refCenter) * scale);
int top = (int) (drawArea.centerY() - (mView.getMeasuredHeight() / 2) * scale);
layoutAt(left, top);
mView.setScaleX(scale);
mView.setScaleY(scale);
// update mViewArea for touch detection.
int l = mView.getLeft();
int t = mView.getTop();
mViewArea.set(l, t,
l + mView.getWidth() * scale,
t + mView.getHeight() * scale);
}
/** Returns true if the point is in the view. */
public boolean areaContains(float x, float y) {
return mViewArea.contains(x, y);
}
/**
* Return the width of the view.
*/
public int getWidth() {
return mView.getWidth();
}
public void copyGeometry(ViewItem item) {
setLeftPosition(item.getLeftPosition());
View v = item.getView();
mView.setTranslationY(v.getTranslationY());
mView.setTranslationX(v.getTranslationX());
}
/**
* Apply a scale factor (i.e. {@param postScale}) on top of current scale at
* pivot point ({@param focusX}, {@param focusY}). Visually it should be the
* same as post concatenating current view's matrix with specified scale.
*/
void postScale(float focusX, float focusY, float postScale, int viewportWidth,
int viewportHeight) {
float transX = getTranslationX();
float transY = getTranslationY();
// Pivot point is top left of the view, so we need to translate
// to scale around focus point
transX -= (focusX - getX()) * (postScale - 1f);
transY -= (focusY - getY()) * (postScale - 1f);
float scaleX = mView.getScaleX() * postScale;
float scaleY = mView.getScaleY() * postScale;
updateTransform(transX, transY, scaleX, scaleY, viewportWidth,
viewportHeight);
}
void updateTransform(float transX, float transY, float scaleX, float scaleY,
int viewportWidth, int viewportHeight) {
float left = transX + mView.getLeft();
float top = transY + mView.getTop();
RectF r = ZoomView.adjustToFitInBounds(new RectF(left, top,
left + mView.getWidth() * scaleX,
top + mView.getHeight() * scaleY),
viewportWidth, viewportHeight);
mView.setScaleX(scaleX);
mView.setScaleY(scaleY);
transX = r.left - mView.getLeft();
transY = r.top - mView.getTop();
mView.setTranslationX(transX);
mView.setTranslationY(transY);
}
void resetTransform() {
mView.setScaleX(FULL_SCREEN_SCALE);
mView.setScaleY(FULL_SCREEN_SCALE);
mView.setTranslationX(0f);
mView.setTranslationY(0f);
}
}
public FilmStripView(Context context) {
super(context);
init((CameraActivity) context);
}
/** Constructor. */
public FilmStripView(Context context, AttributeSet attrs) {
super(context, attrs);
init((CameraActivity) context);
}
/** Constructor. */
public FilmStripView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
init((CameraActivity) context);
}
private void init(CameraActivity cameraActivity) {
// This is for positioning camera controller at the same place in
// different orientations.
setSystemUiVisibility(View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN
| View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION);
setWillNotDraw(false);
mActivity = cameraActivity;
mScale = 1.0f;
mController = new MyController(cameraActivity);
mViewAnimInterpolator = new DecelerateInterpolator();
mZoomView = new ZoomView(cameraActivity);
mZoomView.setVisibility(GONE);
addView(mZoomView);
mGestureRecognizer =
new FilmStripGestureRecognizer(cameraActivity, new MyGestureReceiver());
mSlop = (int) getContext().getResources().getDimension(R.dimen.pie_touch_slop);
}
/**
* Returns the controller.
*
* @return The {@code Controller}.
*/
public Controller getController() {
return mController;
}
public void setListener(Listener l) {
mListener = l;
}
public void setViewGap(int viewGap) {
mViewGap = viewGap;
}
/**
* Sets the helper that's to be used to open photo sphere panoramas.
*/
public void setPanoramaViewHelper(PanoramaViewHelper helper) {
mPanoramaViewHelper = helper;
}
public boolean isAnchoredTo(int id) {
if (mViewItem[mCurrentItem] == null) {
return false;
}
if (mViewItem[mCurrentItem].getID() == id
&& mViewItem[mCurrentItem].getCenterX() == mCenterX) {
return true;
}
return false;
}
private int getCurrentViewType() {
ViewItem curr = mViewItem[mCurrentItem];
if (curr == null) {
return ImageData.TYPE_NONE;
}
return mDataAdapter.getImageData(curr.getID()).getViewType();
}
@Override
public void onDraw(Canvas c) {
if (mViewItem[mCurrentItem] != null && mController.hasNewGeometry()) {
layoutChildren();
super.onDraw(c);
}
}
/** Returns [width, height] preserving image aspect ratio. */
private int[] calculateChildDimension(
int imageWidth, int imageHeight,
int boundWidth, int boundHeight) {
if (imageWidth == ImageData.SIZE_FULL
|| imageHeight == ImageData.SIZE_FULL) {
imageWidth = boundWidth;
imageHeight = boundHeight;
}
int[] ret = new int[2];
ret[0] = boundWidth;
ret[1] = boundHeight;
if (imageWidth * ret[1] > ret[0] * imageHeight) {
ret[1] = imageHeight * ret[0] / imageWidth;
} else {
ret[0] = imageWidth * ret[1] / imageHeight;
}
return ret;
}
private void measureViewItem(ViewItem item, int boundWidth, int boundHeight) {
int id = item.getID();
int[] dim = calculateChildDimension(
mDataAdapter.getImageData(id).getWidth(),
mDataAdapter.getImageData(id).getHeight(),
boundWidth, boundHeight);
item.getView().measure(
MeasureSpec.makeMeasureSpec(
dim[0], MeasureSpec.EXACTLY),
MeasureSpec.makeMeasureSpec(
dim[1], MeasureSpec.EXACTLY));
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
int boundWidth = MeasureSpec.getSize(widthMeasureSpec);
int boundHeight = MeasureSpec.getSize(heightMeasureSpec);
if (boundWidth == 0 || boundHeight == 0) {
// Either width or height is unknown, can't measure children yet.
return;
}
if (mDataAdapter != null) {
mDataAdapter.suggestViewSizeBound(boundWidth / 2, boundHeight / 2);
}
for (ViewItem item : mViewItem) {
if (item != null) {
measureViewItem(item, boundWidth, boundHeight);
}
}
// Measure zoom view
mZoomView.measure(
MeasureSpec.makeMeasureSpec(
widthMeasureSpec, MeasureSpec.EXACTLY),
MeasureSpec.makeMeasureSpec(
heightMeasureSpec, MeasureSpec.EXACTLY));
}
@Override
protected boolean fitSystemWindows(Rect insets) {
// Since the camera preview needs this callback to layout the camera
// controls correctly, we need to call super here.
super.fitSystemWindows(insets);
// After calling super, we need to return false because we have other
// layouts such as bottom controls that needs this callback. The
// framework behavior is to stop propagating this after the first
// child returning true is found.
return false;
}
private int findTheNearestView(int pointX) {
int nearest = 0;
// Find the first non-null ViewItem.
while (nearest < BUFFER_SIZE
&& (mViewItem[nearest] == null || mViewItem[nearest].getLeftPosition() == -1)) {
nearest++;
}
// No existing available ViewItem
if (nearest == BUFFER_SIZE) {
return -1;
}
int min = Math.abs(pointX - mViewItem[nearest].getCenterX());
for (int itemID = nearest + 1; itemID < BUFFER_SIZE && mViewItem[itemID] != null; itemID++) {
// Not measured yet.
if (mViewItem[itemID].getLeftPosition() == -1)
continue;
int c = mViewItem[itemID].getCenterX();
int dist = Math.abs(pointX - c);
if (dist < min) {
min = dist;
nearest = itemID;
}
}
return nearest;
}
private ViewItem buildItemFromData(int dataID) {
ImageData data = mDataAdapter.getImageData(dataID);
if (data == null) {
return null;
}
data.prepare();
View v = mDataAdapter.getView(mActivity, dataID);
if (v == null) {
return null;
}
ViewItem item = new ViewItem(dataID, v);
v = item.getView();
if (v != mCameraView) {
addView(item.getView());
} else {
v.setVisibility(View.VISIBLE);
}
return item;
}
private void removeItem(int itemID) {
if (itemID >= mViewItem.length || mViewItem[itemID] == null) {
return;
}
ImageData data = mDataAdapter.getImageData(mViewItem[itemID].getID());
checkForRemoval(data, mViewItem[itemID].getView());
mViewItem[itemID] = null;
}
/**
* We try to keep the one closest to the center of the screen at position
* mCurrentItem.
*/
private void stepIfNeeded() {
if (!inFilmStrip() && !inFullScreen()) {
// The good timing to step to the next view is when everything is
// not in transition.
return;
}
int nearest = findTheNearestView(mCenterX);
// no change made.
if (nearest == -1 || nearest == mCurrentItem)
return;
// Going to change the current item, notify the listener.
if (mListener != null) {
mListener.onCurrentDataChanged(mViewItem[mCurrentItem].getID(), false);
}
int adjust = nearest - mCurrentItem;
if (adjust > 0) {
for (int k = 0; k < adjust; k++) {
removeItem(k);
}
for (int k = 0; k + adjust < BUFFER_SIZE; k++) {
mViewItem[k] = mViewItem[k + adjust];
}
for (int k = BUFFER_SIZE - adjust; k < BUFFER_SIZE; k++) {
mViewItem[k] = null;
if (mViewItem[k - 1] != null) {
mViewItem[k] = buildItemFromData(mViewItem[k - 1].getID() + 1);
}
}
} else {
for (int k = BUFFER_SIZE - 1; k >= BUFFER_SIZE + adjust; k--) {
removeItem(k);
}
for (int k = BUFFER_SIZE - 1; k + adjust >= 0; k--) {
mViewItem[k] = mViewItem[k + adjust];
}
for (int k = -1 - adjust; k >= 0; k--) {
mViewItem[k] = null;
if (mViewItem[k + 1] != null) {
mViewItem[k] = buildItemFromData(mViewItem[k + 1].getID() - 1);
}
}
}
if (mListener != null) {
mListener.onCurrentDataChanged(mViewItem[mCurrentItem].getID(), true);
}
}
/** Don't go beyond the bound. */
private void clampCenterX() {
ViewItem curr = mViewItem[mCurrentItem];
if (curr == null) {
return;
}
if (curr.getID() == 0 && mCenterX < curr.getCenterX()) {
mCenterX = curr.getCenterX();
if (mController.isScrolling()) {
mController.stopScrolling();
}
}
if (curr.getID() == mDataAdapter.getTotalNumber() - 1
&& mCenterX > curr.getCenterX()) {
mCenterX = curr.getCenterX();
if (!mController.isScrolling()) {
mController.stopScrolling();
}
}
}
private void adjustChildZOrder() {
for (int i = BUFFER_SIZE - 1; i >= 0; i--) {
if (mViewItem[i] == null)
continue;
bringChildToFront(mViewItem[i].getView());
}
}
/**
* If the current photo is a photo sphere, this will launch the Photo Sphere
* panorama viewer.
*/
@Override
public void onViewPhotoSphere() {
ViewItem curr = mViewItem[mCurrentItem];
if (curr != null) {
mDataAdapter.getImageData(curr.getID()).viewPhotoSphere(mPanoramaViewHelper);
}
}
@Override
public void onEdit() {
ImageData data = mDataAdapter.getImageData(getCurrentId());
if (data == null || !(data instanceof LocalData)) {
return;
}
mActivity.launchEditor((LocalData) data);
}
@Override
public void onTinyPlanet() {
// TODO: Bring tiny planet to Camera2.
}
/**
* @return The ID of the current item, or -1.
*/
public int getCurrentId() {
ViewItem current = mViewItem[mCurrentItem];
if (current == null) {
return -1;
}
return current.getID();
}
/**
* Updates the visibility of the bottom controls depending on the current
* data item.
*/
private void updateBottomControls() {
if (mBottomControls == null) {
mBottomControls = (FilmstripBottomControls) ((View) getParent())
.findViewById(R.id.filmstrip_bottom_controls);
mBottomControls.setListener(this);
}
final int requestId = getCurrentId();
// Check if the item has changed since the last time we updated the
// visibility status. Only then check of the current image is a photo
// sphere.
if (requestId == mLastItemId || requestId < 0) {
return;
}
ImageData data = mDataAdapter.getImageData(requestId);
// We can only edit photos, not videos.
mBottomControls.setEditButtonVisibility(data.isPhoto());
// If this is a photo sphere, show the button to view it. If it's a full
// 360 photo sphere, show the tiny planet button.
data.isPhotoSphere(mActivity, new PanoramaSupportCallback() {
@Override
public void panoramaInfoAvailable(final boolean isPanorama,
boolean isPanorama360) {
// Make sure the returned data is for the current image.
if (requestId == getCurrentId()) {
mBottomControls.setViewPhotoSphereButtonVisibility(isPanorama);
mBottomControls.setTinyPlanetButtonVisibility(isPanorama360);
}
}
});
}
private void snapInCenter() {
ViewItem currentItem = mViewItem[mCurrentItem];
if (currentItem == null || mController.isScrolling() || mIsUserScrolling) {
return;
}
int currentViewCenter = currentItem.getCenterX();
if (mCenterX != currentViewCenter) {
int snapInTime = SNAP_IN_CENTER_TIME_MS
* Math.abs(mCenterX - currentViewCenter) / mDrawArea.width();
mController.scrollToPosition(currentViewCenter,
snapInTime, false);
}
if (getCurrentViewType() == ImageData.TYPE_STICKY_VIEW
&& !mController.isScaling()
&& mScale != FULL_SCREEN_SCALE) {
mController.goToFullScreen();
}
}
/**
* Translates the {@link ViewItem} on the left of the current one to match
* the full-screen layout. In full-screen, we show only one {@link ViewItem}
* which occupies the whole screen. The other left ones are put on the left
* side in full scales.
*
* @param currItem The item ID of the current one to be translated.
* @param drawAreaWidth The width of the current draw area.
* @param scaleFraction A {@code float} between 0 and 1. 0 if the current
* scale is {@link FILM_STRIP_SCALE}. 1 if the
* current scale is {@link FULL_SCREEN_SCALE}.
*/
private void translateLeftViewItem(
int currItem, int drawAreaWidth, float scaleFraction) {
if (currItem < 0 || currItem > BUFFER_SIZE - 1) {
Log.e(TAG, "currItem id out of bound.");
return;
}
final ViewItem curr = mViewItem[currItem];
final ViewItem next = mViewItem[currItem + 1];
if (curr == null || next == null) {
Log.e(TAG, "Invalid view item.");
return;
}
final int currCenterX = curr.getCenterX();
final int nextCenterX = next.getCenterX();
final int translate = (int) ((nextCenterX - drawAreaWidth
- currCenterX) * scaleFraction);
curr.layoutIn(mDrawArea, mCenterX, mScale);
curr.getView().setAlpha(1f);
if (inFullScreen()) {
curr.setTranslationX(translate * (mCenterX - currCenterX)
/ (nextCenterX - currCenterX), mScale);
} else {
curr.setTranslationX(translate, mScale);
}
}
/**
* Fade out the {@link ViewItem} on the right of the current one in
* full-screen layout.
*
* @param currItem The ID of the item to fade.
*/
private void fadeAndScaleRightViewItem(int currItem) {
if (currItem < 1 || currItem > BUFFER_SIZE) {
Log.e(TAG, "currItem id out of bound.");
return;
}
final ViewItem curr = mViewItem[currItem];
final ViewItem prev = mViewItem[currItem - 1];
if (curr == null || prev == null) {
Log.e(TAG, "Invalid view item.");
return;
}
final View currView = curr.getView();
if (currItem > mCurrentItem + 1) {
// Every item not right next to the mCurrentItem is invisible.
currView.setVisibility(INVISIBLE);
return;
}
final int prevCenterX = prev.getCenterX();
if (mCenterX <= prevCenterX) {
// Shortcut. If the position is at the center of the previous one,
// set to invisible too.
currView.setVisibility(INVISIBLE);
return;
}
final int currCenterX = curr.getCenterX();
final float fadeDownFraction =
((float) mCenterX - prevCenterX) / (currCenterX - prevCenterX);
curr.layoutIn(mDrawArea, currCenterX,
FILM_STRIP_SCALE + (1f - FILM_STRIP_SCALE) * fadeDownFraction);
currView.setAlpha(fadeDownFraction);
currView.setTranslationX(0);
currView.setVisibility(VISIBLE);
}
private void layoutChildren() {
if (mViewItem[mCurrentItem] == null) {
return;
}
if (mAnchorPending) {
mCenterX = mViewItem[mCurrentItem].getCenterX();
mAnchorPending = false;
}
if (mController.hasNewGeometry()) {
mCenterX = mController.getNewPosition();
mScale = mController.getNewScale();
}
clampCenterX();
/**
* Transformed scale fraction between 0 and 1. 0 if the scale is
* {@link FILM_STRIP_SCALE}. 1 if the scale is {@link FULL_SCREEN_SCALE}
* .
*/
final float scaleFraction = mViewAnimInterpolator.getInterpolation(
(mScale - FILM_STRIP_SCALE) / (FULL_SCREEN_SCALE - FILM_STRIP_SCALE));
final int fullScreenWidth = mDrawArea.width() + mViewGap;
// Layout the current ViewItem first.
if (scaleFraction == 1
&& mCenterX < mViewItem[mCurrentItem].getCenterX()) {
// In full-screen and it's not the first one and mCenterX is on
// the left of the center, we draw the current one to "fade down".
fadeAndScaleRightViewItem(mCurrentItem);
} else if (scaleFraction == 1
&& mCenterX > mViewItem[mCurrentItem].getCenterX()) {
// In full-screen and it's not the last one and mCenterX is on
// the right of the center, we draw the current one translated.
translateLeftViewItem(mCurrentItem, fullScreenWidth, scaleFraction);
} else {
// The normal filmstrip has no translation for the current item. If it has
// translation before, gradually set it to zero.
mViewItem[mCurrentItem].setTranslationX(
mViewItem[mCurrentItem].getScaledTranslationX(mScale) * scaleFraction,
mScale);
mViewItem[mCurrentItem].layoutIn(mDrawArea, mCenterX, mScale);
}
// Layout the rest dependent on the current scale.
// images on the left
for (int itemID = mCurrentItem - 1; itemID >= 0; itemID--) {
final ViewItem curr = mViewItem[itemID];
if (curr == null) {
break;
}
// First, layout relatively to the next one.
final int currLeft = mViewItem[itemID + 1].getLeftPosition()
- curr.getView().getMeasuredWidth() - mViewGap;
curr.setLeftPosition(currLeft);
translateLeftViewItem(itemID, fullScreenWidth, scaleFraction);
}
// images on the right
for (int itemID = mCurrentItem + 1; itemID < BUFFER_SIZE; itemID++) {
ViewItem curr = mViewItem[itemID];
if (curr == null) {
continue;
}
// First, layout relatively to the previous one.
ViewItem prev = mViewItem[itemID - 1];
int currLeft =
prev.getLeftPosition() + prev.getView().getMeasuredWidth()
+ mViewGap;
curr.setLeftPosition(currLeft);
curr.layoutIn(mDrawArea, mCenterX, mScale);
View currView = curr.getView();
if (scaleFraction == 1) {
// It's in full-screen mode.
fadeAndScaleRightViewItem(itemID);
} else {
if (currView.getVisibility() == INVISIBLE) {
currView.setVisibility(VISIBLE);
}
if (itemID == mCurrentItem + 1) {
currView.setAlpha(1f - scaleFraction);
} else {
if (scaleFraction == 0f) {
currView.setAlpha(1f);
} else {
currView.setVisibility(INVISIBLE);
}
}
curr.setTranslationX(
(mViewItem[mCurrentItem].getLeftPosition() - currLeft)
* scaleFraction, mScale);
}
}
stepIfNeeded();
adjustChildZOrder();
snapInCenter();
updateBottomControls();
mLastItemId = getCurrentId();
// Layout zoom view
mZoomView.layout(mDrawArea.left, mDrawArea.top, mDrawArea.right, mDrawArea.bottom);
bringChildToFront(mZoomView);
invalidate();
}
@Override
protected void onLayout(boolean changed, int l, int t, int r, int b) {
mDrawArea.left = l;
mDrawArea.top = t;
mDrawArea.right = r;
mDrawArea.bottom = b;
if (changed) {
resetZoomView();
layoutChildren();
}
}
/**
* Clears the translation and scale that has been set on the view, cancels any loading
* request for image partial decoding, and hides zoom view.
* This is needed for when there is a layout change (e.g. when users re-enter the app,
* or rotate the device, etc).
*/
private void resetZoomView() {
if (!mController.isZoomStarted()) {
return;
}
ViewItem current = mViewItem[mCurrentItem];
if (current == null) {
return;
}
mScale = FULL_SCREEN_SCALE;
current.resetTransform();
mController.cancelLoadingZoomedImage();
mZoomView.setVisibility(GONE);
}
// Keeps the view in the view hierarchy if it's camera preview.
// Remove from the hierarchy otherwise.
private void checkForRemoval(ImageData data, View v) {
if (data.getViewType() != ImageData.TYPE_STICKY_VIEW) {
removeView(v);
data.recycle();
} else {
v.setVisibility(View.INVISIBLE);
if (mCameraView != null && mCameraView != v) {
removeView(mCameraView);
}
mCameraView = v;
}
}
private void slideViewBack(View v) {
v.animate().translationX(0)
.alpha(1f)
.setDuration(GEOMETRY_ADJUST_TIME_MS)
.setInterpolator(mViewAnimInterpolator)
.start();
}
private void updateRemoval(int dataID, final ImageData data) {
int removedItem = findItemByDataID(dataID);
// adjust the data id to be consistent
for (int i = 0; i < BUFFER_SIZE; i++) {
if (mViewItem[i] == null || mViewItem[i].getID() <= dataID) {
continue;
}
mViewItem[i].setID(mViewItem[i].getID() - 1);
}
if (removedItem == -1) {
return;
}
final View removedView = mViewItem[removedItem].getView();
final int offsetX = removedView.getMeasuredWidth() + mViewGap;
for (int i = removedItem + 1; i < BUFFER_SIZE; i++) {
if (mViewItem[i] != null) {
mViewItem[i].setLeftPosition(mViewItem[i].getLeftPosition() - offsetX);
}
}
if (removedItem >= mCurrentItem
&& mViewItem[removedItem].getID() < mDataAdapter.getTotalNumber()) {
// Fill the removed item by left shift when the current one or
// anyone on the right is removed, and there's more data on the
// right available.
for (int i = removedItem; i < BUFFER_SIZE - 1; i++) {
mViewItem[i] = mViewItem[i + 1];
}
// pull data out from the DataAdapter for the last one.
int curr = BUFFER_SIZE - 1;
int prev = curr - 1;
if (mViewItem[prev] != null) {
mViewItem[curr] = buildItemFromData(mViewItem[prev].getID() + 1);
}
// The animation part.
if (inFullScreen()) {
mViewItem[mCurrentItem].getView().setVisibility(VISIBLE);
ViewItem nextItem = mViewItem[mCurrentItem + 1];
if (nextItem != null) {
nextItem.getView().setVisibility(INVISIBLE);
}
}
// Translate the views to their original places.
for (int i = removedItem; i < BUFFER_SIZE; i++) {
if (mViewItem[i] != null) {
mViewItem[i].setTranslationX(offsetX, mScale);
}
}
// The end of the filmstrip might have been changed.
// The mCenterX might be out of the bound.
ViewItem currItem = mViewItem[mCurrentItem];
if (currItem.getID() == mDataAdapter.getTotalNumber() - 1
&& mCenterX > currItem.getCenterX()) {
int adjustDiff = currItem.getCenterX() - mCenterX;
mCenterX = currItem.getCenterX();
for (int i = 0; i < BUFFER_SIZE; i++) {
if (mViewItem[i] != null) {
mViewItem[i].translateXBy(adjustDiff, mScale);
}
}
}
} else {
// fill the removed place by right shift
mCenterX -= offsetX;
for (int i = removedItem; i > 0; i--) {
mViewItem[i] = mViewItem[i - 1];
}
// pull data out from the DataAdapter for the first one.
int curr = 0;
int next = curr + 1;
if (mViewItem[next] != null) {
mViewItem[curr] = buildItemFromData(mViewItem[next].getID() - 1);
}
// Translate the views to their original places.
for (int i = removedItem; i >= 0; i--) {
if (mViewItem[i] != null) {
mViewItem[i].setTranslationX(-offsetX, mScale);
}
}
}
// Now, slide every one back.
for (int i = 0; i < BUFFER_SIZE; i++) {
if (mViewItem[i] != null
&& mViewItem[i].getScaledTranslationX(mScale) != 0f) {
slideViewBack(mViewItem[i].getView());
}
}
int transY = getHeight() / 8;
if (removedView.getTranslationY() < 0) {
transY = -transY;
}
removedView.animate()
.alpha(0f)
.translationYBy(transY)
.setInterpolator(mViewAnimInterpolator)
.setDuration(GEOMETRY_ADJUST_TIME_MS)
.withEndAction(new Runnable() {
@Override
public void run() {
checkForRemoval(data, removedView);
}
})
.start();
layoutChildren();
}
// returns -1 on failure.
private int findItemByDataID(int dataID) {
for (int i = 0; i < BUFFER_SIZE; i++) {
if (mViewItem[i] != null
&& mViewItem[i].getID() == dataID) {
return i;
}
}
return -1;
}
private void updateInsertion(int dataID) {
int insertedItem = findItemByDataID(dataID);
if (insertedItem == -1) {
// Not in the current item buffers. Check if it's inserted
// at the end.
if (dataID == mDataAdapter.getTotalNumber() - 1) {
int prev = findItemByDataID(dataID - 1);
if (prev >= 0 && prev < BUFFER_SIZE - 1) {
// The previous data is in the buffer and we still
// have room for the inserted data.
insertedItem = prev + 1;
}
}
}
// adjust the data id to be consistent
for (int i = 0; i < BUFFER_SIZE; i++) {
if (mViewItem[i] == null || mViewItem[i].getID() < dataID) {
continue;
}
mViewItem[i].setID(mViewItem[i].getID() + 1);
}
if (insertedItem == -1) {
return;
}
final ImageData data = mDataAdapter.getImageData(dataID);
int[] dim = calculateChildDimension(
data.getWidth(), data.getHeight(),
getMeasuredWidth(), getMeasuredHeight());
final int offsetX = dim[0] + mViewGap;
ViewItem viewItem = buildItemFromData(dataID);
if (insertedItem >= mCurrentItem) {
if (insertedItem == mCurrentItem) {
viewItem.setLeftPosition(mViewItem[mCurrentItem].getLeftPosition());
}
// Shift right to make rooms for newly inserted item.
removeItem(BUFFER_SIZE - 1);
for (int i = BUFFER_SIZE - 1; i > insertedItem; i--) {
mViewItem[i] = mViewItem[i - 1];
if (mViewItem[i] != null) {
mViewItem[i].setTranslationX(-offsetX, mScale);
slideViewBack(mViewItem[i].getView());
}
}
} else {
// Shift left. Put the inserted data on the left instead of the
// found position.
--insertedItem;
if (insertedItem < 0) {
return;
}
removeItem(0);
for (int i = 1; i <= insertedItem; i++) {
if (mViewItem[i] != null) {
mViewItem[i].setTranslationX(offsetX, mScale);
slideViewBack(mViewItem[i].getView());
mViewItem[i - 1] = mViewItem[i];
}
}
}
mViewItem[insertedItem] = viewItem;
View insertedView = mViewItem[insertedItem].getView();
insertedView.setAlpha(0f);
insertedView.setTranslationY(getHeight() / 8);
insertedView.animate()
.alpha(1f)
.translationY(0f)
.setInterpolator(mViewAnimInterpolator)
.setDuration(GEOMETRY_ADJUST_TIME_MS)
.start();
invalidate();
}
public void setDataAdapter(DataAdapter adapter) {
mDataAdapter = adapter;
mDataAdapter.suggestViewSizeBound(getMeasuredWidth(), getMeasuredHeight());
mDataAdapter.setListener(new DataAdapter.Listener() {
@Override
public void onDataLoaded() {
reload();
}
@Override
public void onDataUpdated(DataAdapter.UpdateReporter reporter) {
update(reporter);
}
@Override
public void onDataInserted(int dataID, ImageData data) {
if (mViewItem[mCurrentItem] == null) {
// empty now, simply do a reload.
reload();
return;
}
updateInsertion(dataID);
}
@Override
public void onDataRemoved(int dataID, ImageData data) {
updateRemoval(dataID, data);
}
});
}
public boolean inFilmStrip() {
return (mScale == FILM_STRIP_SCALE);
}
public boolean inFullScreen() {
return (mScale == FULL_SCREEN_SCALE);
}
public boolean inCameraFullscreen() {
return isAnchoredTo(0) && inFullScreen()
&& (getCurrentViewType() == ImageData.TYPE_STICKY_VIEW);
}
@Override
public boolean onInterceptTouchEvent(MotionEvent ev) {
if (!inFullScreen() || mController.isScrolling()) {
return true;
}
if (ev.getActionMasked() == MotionEvent.ACTION_DOWN) {
mCheckToIntercept = true;
mDown = MotionEvent.obtain(ev);
ViewItem viewItem = mViewItem[mCurrentItem];
// Do not intercept touch if swipe is not enabled
if (viewItem != null && !mDataAdapter.canSwipeInFullScreen(viewItem.getID())) {
mCheckToIntercept = false;
}
return false;
} else if (ev.getActionMasked() == MotionEvent.ACTION_POINTER_DOWN) {
// Do not intercept touch once child is in zoom mode
mCheckToIntercept = false;
return false;
} else {
if (!mCheckToIntercept) {
return false;
}
if (ev.getEventTime() - ev.getDownTime() > SWIPE_TIME_OUT) {
return false;
}
int deltaX = (int) (ev.getX() - mDown.getX());
int deltaY = (int) (ev.getY() - mDown.getY());
if (ev.getActionMasked() == MotionEvent.ACTION_MOVE
&& deltaX < mSlop * (-1)) {
// intercept left swipe
if (Math.abs(deltaX) >= Math.abs(deltaY) * 2) {
return true;
}
}
}
return false;
}
@Override
public boolean onTouchEvent(MotionEvent ev) {
mGestureRecognizer.onTouchEvent(ev);
return true;
}
private void updateViewItem(int itemID) {
ViewItem item = mViewItem[itemID];
if (item == null) {
Log.e(TAG, "trying to update an null item");
return;
}
removeView(item.getView());
ImageData data = mDataAdapter.getImageData(item.getID());
data.recycle();
ViewItem newItem = buildItemFromData(item.getID());
if (newItem == null) {
Log.e(TAG, "new item is null");
// keep using the old data.
data.prepare();
addView(item.getView());
return;
}
newItem.copyGeometry(item);
mViewItem[itemID] = newItem;
}
/** Some of the data is changed. */
private void update(DataAdapter.UpdateReporter reporter) {
// No data yet.
if (mViewItem[mCurrentItem] == null) {
reload();
return;
}
// Check the current one.
ViewItem curr = mViewItem[mCurrentItem];
int dataID = curr.getID();
if (reporter.isDataRemoved(dataID)) {
reload();
return;
}
if (reporter.isDataUpdated(dataID)) {
updateViewItem(mCurrentItem);
}
// Check left
for (int i = mCurrentItem - 1; i >= 0; i--) {
curr = mViewItem[i];
if (curr != null) {
dataID = curr.getID();
if (reporter.isDataRemoved(dataID) || reporter.isDataUpdated(dataID)) {
updateViewItem(i);
}
} else {
ViewItem next = mViewItem[i + 1];
if (next != null) {
mViewItem[i] = buildItemFromData(next.getID() - 1);
}
}
}
// Check right
for (int i = mCurrentItem + 1; i < BUFFER_SIZE; i++) {
curr = mViewItem[i];
if (curr != null) {
dataID = curr.getID();
if (reporter.isDataRemoved(dataID) || reporter.isDataUpdated(dataID)) {
updateViewItem(i);
}
} else {
ViewItem prev = mViewItem[i - 1];
if (prev != null) {
mViewItem[i] = buildItemFromData(prev.getID() + 1);
}
}
}
// request a layout to find the measured width/height of the view first.
requestLayout();
}
/**
* The whole data might be totally different. Flush all and load from the
* start. Filmstrip will be centered on the first item, i.e. the camera
* preview.
*/
private void reload() {
// Remove all views from the mViewItem buffer, except the camera view.
for (int i = 0; i < mViewItem.length; i++) {
if (mViewItem[i] == null) {
continue;
}
View v = mViewItem[i].getView();
if (v != mCameraView) {
removeView(v);
}
}
// Clear out the mViewItems and rebuild with camera in the center.
Arrays.fill(mViewItem, null);
int dataNumber = mDataAdapter.getTotalNumber();
if (dataNumber == 0) {
return;
}
mViewItem[mCurrentItem] = buildItemFromData(0);
mViewItem[mCurrentItem].setLeftPosition(0);
if (mViewItem[mCurrentItem] == null) {
return;
}
for (int i = mCurrentItem + 1; i < BUFFER_SIZE; i++) {
mViewItem[i] = buildItemFromData(mViewItem[i - 1].getID() + 1);
if (mViewItem[i] == null) {
break;
}
}
// Ensure that the views in mViewItem will layout the first in the
// center of the display upon a reload.
mCenterX = -1;
layoutChildren();
}
private void promoteData(int itemID, int dataID) {
if (mListener != null) {
mListener.onDataPromoted(dataID);
}
}
private void demoteData(int itemID, int dataID) {
if (mListener != null) {
mListener.onDataDemoted(dataID);
}
}
/**
* MyController controls all the geometry animations. It passively tells the
* geometry information on demand.
*/
private class MyController implements
Controller,
ValueAnimator.AnimatorUpdateListener,
Animator.AnimatorListener {
private final ValueAnimator mScaleAnimator;
private ValueAnimator mZoomAnimator;
private boolean mHasNewScale;
private float mNewScale;
private final Scroller mScroller;
private boolean mHasNewPosition;
private final DecelerateInterpolator mDecelerateInterpolator;
private final TimeInterpolator mDecelerateAccelerateInterpolator =
new TimeInterpolator() {
private final TimeInterpolator interpolator =
new AccelerateInterpolator();
@Override
public float getInterpolation(float v) {
float v2 = v * 2f;
return ((v2 < 1f) ?
mDecelerateInterpolator.getInterpolation(v2) / 2f :
interpolator.getInterpolation(v2 - 1f) / 2f + 0.5f);
}
};
private boolean mCanStopScroll;
MyController(Context context) {
mScroller = new Scroller(context);
mHasNewPosition = false;
mCanStopScroll = true;
mHasNewScale = false;
mScaleAnimator = new ValueAnimator();
mScaleAnimator.addUpdateListener(MyController.this);
mScaleAnimator.addListener(MyController.this);
mDecelerateInterpolator = new DecelerateInterpolator(1.5f);
}
@Override
public boolean isScrolling() {
return !mScroller.isFinished();
}
@Override
public boolean isScaling() {
return mScaleAnimator.isRunning();
}
boolean hasNewGeometry() {
mHasNewPosition = mScroller.computeScrollOffset();
if (!mHasNewPosition) {
mCanStopScroll = true;
}
// If the position is locked, then we always return true to force
// the position value to use the locked value.
return (mHasNewPosition || mHasNewScale);
}
/**
* Always call {@link #hasNewGeometry()} before getting the new scale
* value.
*/
float getNewScale() {
if (!mHasNewScale) {
return mScale;
}
mHasNewScale = false;
return mNewScale;
}
/**
* Always call {@link #hasNewGeometry()} before getting the new position
* value.
*/
int getNewPosition() {
if (!mHasNewPosition) {
return mCenterX;
}
return mScroller.getCurrX();
}
private int estimateMinX(int dataID, int leftPos, int viewWidth) {
return leftPos - (dataID + 100) * (viewWidth + mViewGap);
}
private int estimateMaxX(int dataID, int leftPos, int viewWidth) {
return leftPos
+ (mDataAdapter.getTotalNumber() - dataID + 100)
* (viewWidth + mViewGap);
}
/** Zoom all the way in or out on the image at the given pivot point. */
private void zoomAt(final ViewItem current, final float focusX, final float focusY) {
// End previous zoom animation, if any
if (mZoomAnimator != null) {
mZoomAnimator.end();
}
// Calculate end scale
final float maxScale = getCurrentDataMaxScale();
final float endScale = mScale < maxScale - maxScale * TOLERANCE
? maxScale : FULL_SCREEN_SCALE;
mZoomAnimator = new ValueAnimator();
mZoomAnimator.setFloatValues(mScale, endScale);
mZoomAnimator.setDuration(ZOOM_ANIMATION_DURATION_MS);
mZoomAnimator.addListener(new Animator.AnimatorListener() {
@Override
public void onAnimationStart(Animator animation) {
if (mScale == FULL_SCREEN_SCALE) {
enterFullScreen();
setSurroundingViewsVisible(false);
}
cancelLoadingZoomedImage();
}
@Override
public void onAnimationEnd(Animator animation) {
// Make sure animation ends up having the correct scale even
// if it is cancelled before it finishes
if (mScale != endScale) {
current.postScale(focusX, focusY, endScale/mScale, mDrawArea.width(),
mDrawArea.height());
mScale = endScale;
}
if (mScale == FULL_SCREEN_SCALE) {
setSurroundingViewsVisible(true);
mZoomView.setVisibility(GONE);
current.resetTransform();
} else {
mController.loadZoomedImage();
}
mZoomAnimator = null;
}
@Override
public void onAnimationCancel(Animator animation) {
// Do nothing.
}
@Override
public void onAnimationRepeat(Animator animation) {
// Do nothing.
}
});
mZoomAnimator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
@Override
public void onAnimationUpdate(ValueAnimator animation) {
float newScale = (Float) animation.getAnimatedValue();
float postScale = newScale / mScale;
mScale = newScale;
current.postScale(focusX, focusY, postScale, mDrawArea.width(),
mDrawArea.height());
}
});
mZoomAnimator.start();
}
@Override
public void scroll(float deltaX) {
if (mController.isScrolling()) {
return;
}
mCenterX += deltaX;
}
@Override
public void fling(float velocityX) {
if (!stopScrolling()) {
return;
}
ViewItem item = mViewItem[mCurrentItem];
if (item == null) {
return;
}
float scaledVelocityX = velocityX / mScale;
if (inFullScreen() && getCurrentViewType() == ImageData.TYPE_STICKY_VIEW
&& scaledVelocityX < 0) {
// Swipe left in camera preview.
goToFilmStrip();
}
int w = getWidth();
// Estimation of possible length on the left. To ensure the
// velocity doesn't become too slow eventually, we add a huge number
// to the estimated maximum.
int minX = estimateMinX(item.getID(), item.getLeftPosition(), w);
// Estimation of possible length on the right. Likewise, exaggerate
// the possible maximum too.
int maxX = estimateMaxX(item.getID(), item.getLeftPosition(), w);
mScroller.fling(mCenterX, 0, (int) -velocityX, 0, minX, maxX, 0, 0);
layoutChildren();
}
@Override
public boolean stopScrolling() {
if (!mCanStopScroll) {
return false;
}
mScroller.forceFinished(true);
mHasNewPosition = false;
return true;
}
private void stopScale() {
mScaleAnimator.cancel();
mHasNewScale = false;
}
@Override
public void scrollToPosition(int position, int duration, boolean interruptible) {
if (!stopScrolling()) {
return;
}
mCanStopScroll = interruptible;
stopScrolling();
mScroller.startScroll(mCenterX, 0, position - mCenterX,
0, duration);
mHasNewPosition = true;
invalidate();
}
@Override
public boolean goToNextItem() {
ViewItem nextItem = mViewItem[mCurrentItem + 1];
if (nextItem == null) {
return false;
}
stopScale();
scrollToPosition(nextItem.getCenterX(), GEOMETRY_ADJUST_TIME_MS * 2, false);
mScaleAnimator.setFloatValues(FULL_SCREEN_SCALE, FILM_STRIP_SCALE, FULL_SCREEN_SCALE);
mScaleAnimator.setInterpolator(mDecelerateAccelerateInterpolator);
mScaleAnimator.setDuration(GEOMETRY_ADJUST_TIME_MS * 2);
mScaleAnimator.start();
return true;
}
private void scaleTo(float scale, int duration) {
if (mViewItem[mCurrentItem] == null) {
return;
}
stopScale();
mScaleAnimator.setDuration(duration);
mScaleAnimator.setFloatValues(mScale, scale);
mScaleAnimator.setInterpolator(mDecelerateInterpolator);
mScaleAnimator.start();
layoutChildren();
}
@Override
public void goToFilmStrip() {
scaleTo(FILM_STRIP_SCALE, GEOMETRY_ADJUST_TIME_MS);
if (mListener != null) {
mListener.onSwitchMode(false);
mBottomControls.setVisibility(View.VISIBLE);
}
}
@Override
public void goToFullScreen() {
if (mViewItem[mCurrentItem] != null) {
mController.scrollToPosition(mViewItem[mCurrentItem].getCenterX(),
GEOMETRY_ADJUST_TIME_MS, false);
}
enterFullScreen();
if (inFullScreen()) {
return;
}
scaleTo(1f, GEOMETRY_ADJUST_TIME_MS);
}
private void enterFullScreen() {
if (mListener != null) {
// TODO: After full size images snapping to fill the screen at
// the end of a scroll/fling is implemented, we should only make
// this call when the view on the center of the screen is
// camera preview
mListener.onSwitchMode(true);
mBottomControls.setVisibility(View.GONE);
}
}
private void setSurroundingViewsVisible(boolean visible) {
// Hide everything on the left
// TODO: Need to find a better way to toggle the visibility of views around
// the current view.
for (int i = 0; i < mCurrentItem; i++) {
if (i == mCurrentItem || mViewItem[i] == null) {
continue;
}
mViewItem[i].getView().setVisibility(visible ? VISIBLE : INVISIBLE);
}
}
private void leaveFullScreen() {
if (mListener != null) {
mListener.onSwitchMode(false);
mBottomControls.setVisibility(View.VISIBLE);
}
}
private Uri getCurrentContentUri() {
ViewItem curr = mViewItem[mCurrentItem];
if (curr == null) {
return Uri.EMPTY;
}
return mDataAdapter.getImageData(curr.getID()).getContentUri();
}
/**
* Here we only support up to 1:1 image zoom (i.e. a 100% view of the
* actual pixels). The max scale that we can apply on the view should
* make the view same size as the image, in pixels.
*/
private float getCurrentDataMaxScale() {
ViewItem curr = mViewItem[mCurrentItem];
ImageData imageData = mDataAdapter.getImageData(curr.getID());
if (curr == null || !imageData
.isUIActionSupported(ImageData.ACTION_ZOOM)) {
return FULL_SCREEN_SCALE;
}
float imageWidth = (float) imageData.getWidth();
return imageWidth / (float) curr.getWidth();
}
private void loadZoomedImage() {
if (!isZoomStarted()) {
return;
}
ViewItem curr = mViewItem[mCurrentItem];
if(curr == null || !mDataAdapter.getImageData(curr.getID())
.isUIActionSupported(ImageData.ACTION_ZOOM)) {
return;
}
Uri uri = getCurrentContentUri();
RectF viewRect = curr.getViewRect();
if (uri == null || uri == Uri.EMPTY) {
return;
}
mZoomView.loadBitmap(uri, viewRect);
}
private void cancelLoadingZoomedImage() {
mZoomView.cancelPartialDecodingTask();
}
@Override
public void goToFirstItem() {
// TODO: animate to camera if it is still in the mViewItem buffer
// versus a full reload which will perform an immediate transition
reload();
}
@Override
public void onAnimationUpdate(ValueAnimator animation) {
if (mViewItem[mCurrentItem] == null) {
return;
}
mHasNewScale = true;
mNewScale = (Float) animation.getAnimatedValue();
layoutChildren();
}
@Override
public void onAnimationStart(Animator anim) {
mHasNewScale = true;
}
@Override
public void onAnimationEnd(Animator anim) {
ViewItem item = mViewItem[mCurrentItem];
if (item == null) {
return;
}
if (mCenterX != item.getCenterX()) {
if (inFilmStrip()) {
snapInCenter();
}
}
}
@Override
public void onAnimationCancel(Animator anim) {
}
@Override
public void onAnimationRepeat(Animator anim) {
}
public boolean isZoomStarted() {
return mScale > FULL_SCREEN_SCALE;
}
public boolean isZoomAnimationRunning() {
return mZoomAnimator != null && mZoomAnimator.isRunning();
}
}
private class MyGestureReceiver implements FilmStripGestureRecognizer.Listener {
// Indicating the current trend of scaling is up (>1) or down (<1).
private float mScaleTrend;
private float mMaxScale;
@Override
public boolean onSingleTapUp(float x, float y) {
if (inFilmStrip()) {
ViewItem centerItem = mViewItem[mCurrentItem];
if (centerItem != null && centerItem.areaContains(x, y)) {
mController.goToFullScreen();
return true;
}
} else if (inFullScreen()) {
boolean visible = mListener.onToggleActionBarVisibility();
mBottomControls.setVisibility(visible ? View.VISIBLE : View.GONE);
return true;
}
return false;
}
@Override
public boolean onDoubleTap(float x, float y) {
if (mScale < FULL_SCREEN_SCALE || inCameraFullscreen()) {
return false;
}
ViewItem current = mViewItem[mCurrentItem];
if (current == null) {
return false;
}
mController.zoomAt(current, x, y);
return false;
}
@Override
public boolean onDown(float x, float y) {
if (mController.isScrolling()) {
mController.stopScrolling();
}
// A down event is usually followed by a gesture, we apply gesture on
// the lower-res image during a gesture to ensure a responsive experience.
// TODO: Delay this until gesture starts.
if (mController.isZoomStarted()) {
mZoomView.setVisibility(GONE);
}
return true;
}
@Override
public boolean onUp(float x, float y) {
if (mController.isZoomAnimationRunning()) {
return false;
}
if (mController.isZoomStarted()) {
mController.loadZoomedImage();
return true;
}
float halfH = getHeight() / 2;
mIsUserScrolling = false;
for (int i = 0; i < BUFFER_SIZE; i++) {
if (mViewItem[i] == null) {
continue;
}
float transY = mViewItem[i].getScaledTranslationY(mScale);
if (transY == 0) {
continue;
}
int id = mViewItem[i].getID();
if (mDataAdapter.getImageData(id)
.isUIActionSupported(ImageData.ACTION_DEMOTE)
&& transY > halfH) {
demoteData(i, id);
} else if (mDataAdapter.getImageData(id)
.isUIActionSupported(ImageData.ACTION_PROMOTE)
&& transY < -halfH) {
promoteData(i, id);
} else {
// put the view back.
mViewItem[i].getView().animate()
.translationY(0f)
.alpha(1f)
.setDuration(GEOMETRY_ADJUST_TIME_MS)
.start();
}
}
snapInCenter();
return false;
}
@Override
public boolean onScroll(float x, float y, float dx, float dy) {
if (mViewItem[mCurrentItem] == null) {
return false;
}
// When image is zoomed in to be bigger than the screen
if (mController.isZoomStarted()) {
mController.cancelLoadingZoomedImage();
ViewItem curr = mViewItem[mCurrentItem];
float transX = curr.getTranslationX() - dx;
float transY = curr.getTranslationY() - dy;
curr.updateTransform(transX, transY, mScale, mScale, mDrawArea.width(),
mDrawArea.height());
return true;
}
mIsUserScrolling = true;
int deltaX = (int) (dx / mScale);
if (inFilmStrip()) {
if (Math.abs(dx) > Math.abs(dy)) {
if (deltaX > 0
&& inFullScreen()
&& getCurrentViewType() == ImageData.TYPE_STICKY_VIEW) {
mController.goToFilmStrip();
}
mController.scroll(deltaX);
} else {
// Vertical part. Promote or demote.
// int scaledDeltaY = (int) (dy * mScale);
int hit = 0;
Rect hitRect = new Rect();
for (; hit < BUFFER_SIZE; hit++) {
if (mViewItem[hit] == null) {
continue;
}
mViewItem[hit].getView().getHitRect(hitRect);
if (hitRect.contains((int) x, (int) y)) {
break;
}
}
if (hit == BUFFER_SIZE) {
return false;
}
ImageData data = mDataAdapter.getImageData(mViewItem[hit].getID());
float transY = mViewItem[hit].getScaledTranslationY(mScale) - dy / mScale;
if (!data.isUIActionSupported(ImageData.ACTION_DEMOTE) && transY > 0f) {
transY = 0f;
}
if (!data.isUIActionSupported(ImageData.ACTION_PROMOTE) && transY < 0f) {
transY = 0f;
}
mViewItem[hit].setTranslationY(transY, mScale);
}
} else if (inFullScreen()) {
if (deltaX > 0 && inCameraFullscreen()) {
mController.goToFilmStrip();
}
// Multiplied by 1.2 to make it more easy to swipe.
mController.scroll((int) (deltaX * 1.2));
}
layoutChildren();
return true;
}
@Override
public boolean onFling(float velocityX, float velocityY) {
if (Math.abs(velocityX) < Math.abs(velocityY)) {
// ignore vertical fling.
return true;
}
if (mScale != FILM_STRIP_SCALE) {
// No fling in other modes.
return false;
}
mController.fling(velocityX);
return true;
}
@Override
public boolean onScaleBegin(float focusX, float focusY) {
mController.cancelLoadingZoomedImage();
if (inCameraFullscreen()) {
return false;
}
mScaleTrend = 1f;
mMaxScale = mController.getCurrentDataMaxScale();
return true;
}
@Override
public boolean onScale(float focusX, float focusY, float scale) {
if (inCameraFullscreen()) {
return false;
}
mScaleTrend = mScaleTrend * 0.3f + scale * 0.7f;
float newScale = mScale * scale;
if (mScale < FULL_SCREEN_SCALE && newScale < FULL_SCREEN_SCALE) {
// Scaled view is smaller than or equal to screen size both before
// and after scaling
mScale = newScale;
if (mScale <= FILM_STRIP_SCALE) {
mScale = FILM_STRIP_SCALE;
}
layoutChildren();
} else if (mScale < FULL_SCREEN_SCALE && newScale >= FULL_SCREEN_SCALE) {
// Going from smaller than screen size to bigger than or equal to screen size
mScale = FULL_SCREEN_SCALE;
mController.enterFullScreen();
layoutChildren();
mController.setSurroundingViewsVisible(false);
} else if (mScale >= FULL_SCREEN_SCALE && newScale < FULL_SCREEN_SCALE) {
// Going from bigger than or equal to screen size to smaller than screen size
mScale = newScale;
mController.leaveFullScreen();
layoutChildren();
mController.setSurroundingViewsVisible(true);
} else {
// Scaled view bigger than or equal to screen size both before
// and after scaling
if (!mController.isZoomStarted()) {
mController.setSurroundingViewsVisible(false);
}
ViewItem curr = mViewItem[mCurrentItem];
// Make sure the image is not overly scaled
newScale = Math.min(newScale, mMaxScale);
float postScale = newScale / mScale;
curr.postScale(focusX, focusY, postScale, mDrawArea.width(), mDrawArea.height());
mScale = newScale;
}
return true;
}
@Override
public void onScaleEnd() {
if (mScale > FULL_SCREEN_SCALE + TOLERANCE) {
return;
}
mController.setSurroundingViewsVisible(true);
if (mScale <= FILM_STRIP_SCALE + TOLERANCE) {
mController.goToFilmStrip();
} else if (mScaleTrend > 1f || mScale > FULL_SCREEN_SCALE - TOLERANCE) {
if (mController.isZoomStarted()) {
mScale = FULL_SCREEN_SCALE;
mViewItem[mCurrentItem].updateTransform(0f, 0f, 1f, 1f, mDrawArea.width(),
mDrawArea.height());
}
mController.goToFullScreen();
} else {
mController.goToFilmStrip();
}
mScaleTrend = 1f;
}
}
}
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