/*
* Copyright (C) 2012 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.keyguard;
import android.animation.Animator;
import android.animation.AnimatorListenerAdapter;
import android.animation.AnimatorSet;
import android.animation.ObjectAnimator;
import android.animation.TimeInterpolator;
import android.animation.ValueAnimator;
import android.animation.ValueAnimator.AnimatorUpdateListener;
import android.content.Context;
import android.content.res.Resources;
import android.content.res.TypedArray;
import android.graphics.Canvas;
import android.graphics.Matrix;
import android.graphics.PointF;
import android.graphics.Rect;
import android.os.Bundle;
import android.os.Parcel;
import android.os.Parcelable;
import android.util.AttributeSet;
import android.util.DisplayMetrics;
import android.util.Log;
import android.view.*;
import android.view.accessibility.AccessibilityEvent;
import android.view.accessibility.AccessibilityManager;
import android.view.accessibility.AccessibilityNodeInfo;
import android.view.animation.AccelerateInterpolator;
import android.view.animation.AnimationUtils;
import android.view.animation.DecelerateInterpolator;
import android.view.animation.Interpolator;
import android.view.animation.LinearInterpolator;
import android.widget.Scroller;
import java.util.ArrayList;
/**
* An abstraction of the original Workspace which supports browsing through a
* sequential list of "pages"
*/
public abstract class PagedView extends ViewGroup implements ViewGroup.OnHierarchyChangeListener {
private static final int WARP_SNAP_DURATION = 160;
private static final String TAG = "WidgetPagedView";
private static final boolean DEBUG = KeyguardConstants.DEBUG;
private static final boolean DEBUG_WARP = false;
protected static final int INVALID_PAGE = -1;
private static final int WARP_PEEK_ANIMATION_DURATION = 150;
private static final float WARP_ANIMATE_AMOUNT = -75.0f; // in dip
// the min drag distance for a fling to register, to prevent random page shifts
private static final int MIN_LENGTH_FOR_FLING = 25;
protected static final int PAGE_SNAP_ANIMATION_DURATION = 750;
protected static final int SLOW_PAGE_SNAP_ANIMATION_DURATION = 950;
protected static final float NANOTIME_DIV = 1000000000.0f;
private static final float OVERSCROLL_ACCELERATE_FACTOR = 2;
private static final float OVERSCROLL_DAMP_FACTOR = 0.14f;
private static final float RETURN_TO_ORIGINAL_PAGE_THRESHOLD = 0.33f;
// The page is moved more than halfway, automatically move to the next page on touch up.
private static final float SIGNIFICANT_MOVE_THRESHOLD = 0.5f;
// The following constants need to be scaled based on density. The scaled versions will be
// assigned to the corresponding member variables below.
private static final int FLING_THRESHOLD_VELOCITY = 1500;
private static final int MIN_SNAP_VELOCITY = 1500;
private static final int MIN_FLING_VELOCITY = 500;
// We are disabling touch interaction of the widget region for factory ROM.
private static final boolean DISABLE_TOUCH_INTERACTION = false;
private static final boolean DISABLE_TOUCH_SIDE_PAGES = true;
private static final boolean DISABLE_FLING_TO_DELETE = false;
static final int AUTOMATIC_PAGE_SPACING = -1;
protected int mFlingThresholdVelocity;
protected int mMinFlingVelocity;
protected int mMinSnapVelocity;
protected float mDensity;
protected float mSmoothingTime;
protected float mTouchX;
protected boolean mFirstLayout = true;
protected int mCurrentPage;
protected int mChildCountOnLastMeasure;
protected int mNextPage = INVALID_PAGE;
protected int mMaxScrollX;
protected Scroller mScroller;
private VelocityTracker mVelocityTracker;
private float mParentDownMotionX;
private float mParentDownMotionY;
private float mDownMotionX;
private float mDownMotionY;
private float mDownScrollX;
protected float mLastMotionX;
protected float mLastMotionXRemainder;
protected float mLastMotionY;
protected float mTotalMotionX;
private int mLastScreenCenter = -1;
private int[] mChildOffsets;
private int[] mChildRelativeOffsets;
private int[] mChildOffsetsWithLayoutScale;
private String mDeleteString; // Accessibility announcement when widget is deleted
protected final static int TOUCH_STATE_REST = 0;
protected final static int TOUCH_STATE_SCROLLING = 1;
protected final static int TOUCH_STATE_PREV_PAGE = 2;
protected final static int TOUCH_STATE_NEXT_PAGE = 3;
protected final static int TOUCH_STATE_REORDERING = 4;
protected final static int TOUCH_STATE_READY = 5; // when finger is down
protected final static float ALPHA_QUANTIZE_LEVEL = 0.0001f;
protected final static float TOUCH_SLOP_SCALE = 1.0f;
protected int mTouchState = TOUCH_STATE_REST;
protected boolean mForceScreenScrolled = false;
protected OnLongClickListener mLongClickListener;
protected int mTouchSlop;
private int mPagingTouchSlop;
private int mMaximumVelocity;
private int mMinimumWidth;
protected int mPageSpacing;
protected int mCellCountX = 0;
protected int mCellCountY = 0;
protected boolean mAllowOverScroll = true;
protected int mUnboundedScrollX;
protected int[] mTempVisiblePagesRange = new int[2];
protected boolean mForceDrawAllChildrenNextFrame;
// mOverScrollX is equal to getScrollX() when we're within the normal scroll range. Otherwise
// it is equal to the scaled overscroll position. We use a separate value so as to prevent
// the screens from continuing to translate beyond the normal bounds.
protected int mOverScrollX;
// parameter that adjusts the layout to be optimized for pages with that scale factor
protected float mLayoutScale = 1.0f;
protected static final int INVALID_POINTER = -1;
protected int mActivePointerId = INVALID_POINTER;
private PageSwitchListener mPageSwitchListener;
protected ArrayList<Boolean> mDirtyPageContent;
// If true, syncPages and syncPageItems will be called to refresh pages
protected boolean mContentIsRefreshable = true;
// If true, modify alpha of neighboring pages as user scrolls left/right
protected boolean mFadeInAdjacentScreens = false;
// It true, use a different slop parameter (pagingTouchSlop = 2 * touchSlop) for deciding
// to switch to a new page
protected boolean mUsePagingTouchSlop = true;
// If true, the subclass should directly update scrollX itself in its computeScroll method
// (SmoothPagedView does this)
protected boolean mDeferScrollUpdate = false;
protected boolean mIsPageMoving = false;
// All syncs and layout passes are deferred until data is ready.
protected boolean mIsDataReady = true;
// Scrolling indicator
private ValueAnimator mScrollIndicatorAnimator;
private View mScrollIndicator;
private int mScrollIndicatorPaddingLeft;
private int mScrollIndicatorPaddingRight;
private boolean mShouldShowScrollIndicator = false;
private boolean mShouldShowScrollIndicatorImmediately = false;
protected static final int sScrollIndicatorFadeInDuration = 150;
protected static final int sScrollIndicatorFadeOutDuration = 650;
protected static final int sScrollIndicatorFlashDuration = 650;
// The viewport whether the pages are to be contained (the actual view may be larger than the
// viewport)
private Rect mViewport = new Rect();
// Reordering
// We use the min scale to determine how much to expand the actually PagedView measured
// dimensions such that when we are zoomed out, the view is not clipped
private int REORDERING_DROP_REPOSITION_DURATION = 200;
protected int REORDERING_REORDER_REPOSITION_DURATION = 300;
protected int REORDERING_ZOOM_IN_OUT_DURATION = 250;
private int REORDERING_SIDE_PAGE_HOVER_TIMEOUT = 300;
private float REORDERING_SIDE_PAGE_BUFFER_PERCENTAGE = 0.1f;
private long REORDERING_DELETE_DROP_TARGET_FADE_DURATION = 150;
private float mMinScale = 1f;
protected View mDragView;
protected AnimatorSet mZoomInOutAnim;
private Runnable mSidePageHoverRunnable;
private int mSidePageHoverIndex = -1;
// This variable's scope is only for the duration of startReordering() and endReordering()
private boolean mReorderingStarted = false;
// This variable's scope is for the duration of startReordering() and after the zoomIn()
// animation after endReordering()
private boolean mIsReordering;
// The runnable that settles the page after snapToPage and animateDragViewToOriginalPosition
private int NUM_ANIMATIONS_RUNNING_BEFORE_ZOOM_OUT = 2;
private int mPostReorderingPreZoomInRemainingAnimationCount;
private Runnable mPostReorderingPreZoomInRunnable;
// Edge swiping
private boolean mOnlyAllowEdgeSwipes = false;
private boolean mDownEventOnEdge = false;
private int mEdgeSwipeRegionSize = 0;
// Convenience/caching
private Matrix mTmpInvMatrix = new Matrix();
private float[] mTmpPoint = new float[2];
private Rect mTmpRect = new Rect();
private Rect mAltTmpRect = new Rect();
// Fling to delete
private int FLING_TO_DELETE_FADE_OUT_DURATION = 350;
private float FLING_TO_DELETE_FRICTION = 0.035f;
// The degrees specifies how much deviation from the up vector to still consider a fling "up"
private float FLING_TO_DELETE_MAX_FLING_DEGREES = 65f;
protected int mFlingToDeleteThresholdVelocity = -1400;
// Drag to delete
private boolean mDeferringForDelete = false;
private int DELETE_SLIDE_IN_SIDE_PAGE_DURATION = 250;
private int DRAG_TO_DELETE_FADE_OUT_DURATION = 350;
// Drop to delete
private View mDeleteDropTarget;
// Bouncer
private boolean mTopAlignPageWhenShrinkingForBouncer = false;
// Page warping
private int mPageSwapIndex = -1; // the page we swapped out if needed
private int mPageWarpIndex = -1; // the page we intend to warp
private boolean mWarpPageExposed;
private ViewPropertyAnimator mWarpAnimation;
private boolean mIsCameraEvent;
private float mWarpPeekAmount;
private boolean mOnPageEndWarpCalled;
private boolean mOnPageBeginWarpCalled;
public interface PageSwitchListener {
void onPageSwitching(View newPage, int newPageIndex);
void onPageSwitched(View newPage, int newPageIndex);
}
public PagedView(Context context) {
this(context, null);
}
public PagedView(Context context, AttributeSet attrs) {
this(context, attrs, 0);
}
public PagedView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
TypedArray a = context.obtainStyledAttributes(attrs,
R.styleable.PagedView, defStyle, 0);
setPageSpacing(a.getDimensionPixelSize(R.styleable.PagedView_pageSpacing, 0));
mScrollIndicatorPaddingLeft =
a.getDimensionPixelSize(R.styleable.PagedView_scrollIndicatorPaddingLeft, 0);
mScrollIndicatorPaddingRight =
a.getDimensionPixelSize(R.styleable.PagedView_scrollIndicatorPaddingRight, 0);
a.recycle();
Resources r = getResources();
mEdgeSwipeRegionSize = r.getDimensionPixelSize(R.dimen.kg_edge_swipe_region_size);
mTopAlignPageWhenShrinkingForBouncer =
r.getBoolean(R.bool.kg_top_align_page_shrink_on_bouncer_visible);
setHapticFeedbackEnabled(false);
init();
}
/**
* Initializes various states for this workspace.
*/
protected void init() {
mDirtyPageContent = new ArrayList<Boolean>();
mDirtyPageContent.ensureCapacity(32);
mScroller = new Scroller(getContext(), new ScrollInterpolator());
mCurrentPage = 0;
final ViewConfiguration configuration = ViewConfiguration.get(getContext());
mTouchSlop = configuration.getScaledTouchSlop();
mPagingTouchSlop = configuration.getScaledPagingTouchSlop();
mMaximumVelocity = configuration.getScaledMaximumFlingVelocity();
mDensity = getResources().getDisplayMetrics().density;
mWarpPeekAmount = mDensity * WARP_ANIMATE_AMOUNT;
// Scale the fling-to-delete threshold by the density
mFlingToDeleteThresholdVelocity = (int) (mFlingToDeleteThresholdVelocity * mDensity);
mFlingThresholdVelocity = (int) (FLING_THRESHOLD_VELOCITY * mDensity);
mMinFlingVelocity = (int) (MIN_FLING_VELOCITY * mDensity);
mMinSnapVelocity = (int) (MIN_SNAP_VELOCITY * mDensity);
setOnHierarchyChangeListener(this);
}
void setDeleteDropTarget(View v) {
mDeleteDropTarget = v;
}
// Convenience methods to map points from self to parent and vice versa
float[] mapPointFromViewToParent(View v, float x, float y) {
mTmpPoint[0] = x;
mTmpPoint[1] = y;
v.getMatrix().mapPoints(mTmpPoint);
mTmpPoint[0] += v.getLeft();
mTmpPoint[1] += v.getTop();
return mTmpPoint;
}
float[] mapPointFromParentToView(View v, float x, float y) {
mTmpPoint[0] = x - v.getLeft();
mTmpPoint[1] = y - v.getTop();
v.getMatrix().invert(mTmpInvMatrix);
mTmpInvMatrix.mapPoints(mTmpPoint);
return mTmpPoint;
}
void updateDragViewTranslationDuringDrag() {
float x = mLastMotionX - mDownMotionX + getScrollX() - mDownScrollX;
float y = mLastMotionY - mDownMotionY;
mDragView.setTranslationX(x);
mDragView.setTranslationY(y);
if (DEBUG) Log.d(TAG, "PagedView.updateDragViewTranslationDuringDrag(): " + x + ", " + y);
}
public void setMinScale(float f) {
mMinScale = f;
requestLayout();
}
@Override
public void setScaleX(float scaleX) {
super.setScaleX(scaleX);
if (isReordering(true)) {
float[] p = mapPointFromParentToView(this, mParentDownMotionX, mParentDownMotionY);
mLastMotionX = p[0];
mLastMotionY = p[1];
updateDragViewTranslationDuringDrag();
}
}
// Convenience methods to get the actual width/height of the PagedView (since it is measured
// to be larger to account for the minimum possible scale)
int getViewportWidth() {
return mViewport.width();
}
int getViewportHeight() {
return mViewport.height();
}
// Convenience methods to get the offset ASSUMING that we are centering the pages in the
// PagedView both horizontally and vertically
int getViewportOffsetX() {
return (getMeasuredWidth() - getViewportWidth()) / 2;
}
int getViewportOffsetY() {
return (getMeasuredHeight() - getViewportHeight()) / 2;
}
public void setPageSwitchListener(PageSwitchListener pageSwitchListener) {
mPageSwitchListener = pageSwitchListener;
if (mPageSwitchListener != null) {
mPageSwitchListener.onPageSwitched(getPageAt(mCurrentPage), mCurrentPage);
}
}
/**
* Called by subclasses to mark that data is ready, and that we can begin loading and laying
* out pages.
*/
protected void setDataIsReady() {
mIsDataReady = true;
}
protected boolean isDataReady() {
return mIsDataReady;
}
/**
* Returns the index of the currently displayed page.
*
* @return The index of the currently displayed page.
*/
int getCurrentPage() {
return mCurrentPage;
}
int getNextPage() {
return (mNextPage != INVALID_PAGE) ? mNextPage : mCurrentPage;
}
int getPageCount() {
return getChildCount();
}
View getPageAt(int index) {
return getChildAt(index);
}
protected int indexToPage(int index) {
return index;
}
/**
* Updates the scroll of the current page immediately to its final scroll position. We use this
* in CustomizePagedView to allow tabs to share the same PagedView while resetting the scroll of
* the previous tab page.
*/
protected void updateCurrentPageScroll() {
int offset = getChildOffset(mCurrentPage);
int relOffset = getRelativeChildOffset(mCurrentPage);
int newX = offset - relOffset;
scrollTo(newX, 0);
mScroller.setFinalX(newX);
mScroller.forceFinished(true);
}
/**
* Sets the current page.
*/
void setCurrentPage(int currentPage) {
notifyPageSwitching(currentPage);
if (!mScroller.isFinished()) {
mScroller.abortAnimation();
}
// don't introduce any checks like mCurrentPage == currentPage here-- if we change the
// the default
if (getChildCount() == 0) {
return;
}
mForceScreenScrolled = true;
mCurrentPage = Math.max(0, Math.min(currentPage, getPageCount() - 1));
updateCurrentPageScroll();
updateScrollingIndicator();
notifyPageSwitched();
invalidate();
}
public void setOnlyAllowEdgeSwipes(boolean enable) {
mOnlyAllowEdgeSwipes = enable;
}
protected void notifyPageSwitching(int whichPage) {
if (mPageSwitchListener != null) {
mPageSwitchListener.onPageSwitching(getPageAt(whichPage), whichPage);
}
}
protected void notifyPageSwitched() {
if (mPageSwitchListener != null) {
mPageSwitchListener.onPageSwitched(getPageAt(mCurrentPage), mCurrentPage);
}
}
protected void pageBeginMoving() {
if (DEBUG_WARP) Log.v(TAG, "pageBeginMoving(" + mIsPageMoving + ")");
if (!mIsPageMoving) {
mIsPageMoving = true;
if (isWarping()) {
dispatchOnPageBeginWarp();
}
onPageBeginMoving();
}
}
private void dispatchOnPageBeginWarp() {
if (!mOnPageBeginWarpCalled) {
onPageBeginWarp();
mOnPageBeginWarpCalled = true;
}
mOnPageEndWarpCalled = false;
}
private void dispatchOnPageEndWarp() {
if (!mOnPageEndWarpCalled) {
onPageEndWarp();
mOnPageEndWarpCalled = true;
}
mOnPageBeginWarpCalled = false;
}
protected void pageEndMoving() {
if (DEBUG_WARP) Log.v(TAG, "pageEndMoving(" + mIsPageMoving + ")");
if (mIsPageMoving) {
mIsPageMoving = false;
if (isWarping()) {
dispatchOnPageEndWarp();
mWarpPageExposed = false;
}
onPageEndMoving();
}
}
protected boolean isPageMoving() {
return mIsPageMoving;
}
// a method that subclasses can override to add behavior
protected void onPageBeginMoving() {
}
// a method that subclasses can override to add behavior
protected void onPageEndMoving() {
}
/**
* Registers the specified listener on each page contained in this workspace.
*
* @param l The listener used to respond to long clicks.
*/
@Override
public void setOnLongClickListener(OnLongClickListener l) {
mLongClickListener = l;
final int count = getPageCount();
for (int i = 0; i < count; i++) {
getPageAt(i).setOnLongClickListener(l);
}
}
@Override
public void scrollBy(int x, int y) {
scrollTo(mUnboundedScrollX + x, getScrollY() + y);
}
@Override
public void scrollTo(int x, int y) {
mUnboundedScrollX = x;
if (x < 0) {
super.scrollTo(0, y);
if (mAllowOverScroll) {
overScroll(x);
}
} else if (x > mMaxScrollX) {
super.scrollTo(mMaxScrollX, y);
if (mAllowOverScroll) {
overScroll(x - mMaxScrollX);
}
} else {
mOverScrollX = x;
super.scrollTo(x, y);
}
mTouchX = x;
mSmoothingTime = System.nanoTime() / NANOTIME_DIV;
// Update the last motion events when scrolling
if (isReordering(true)) {
float[] p = mapPointFromParentToView(this, mParentDownMotionX, mParentDownMotionY);
mLastMotionX = p[0];
mLastMotionY = p[1];
updateDragViewTranslationDuringDrag();
}
}
// we moved this functionality to a helper function so SmoothPagedView can reuse it
protected boolean computeScrollHelper() {
if (mScroller.computeScrollOffset()) {
// Don't bother scrolling if the page does not need to be moved
if (getScrollX() != mScroller.getCurrX()
|| getScrollY() != mScroller.getCurrY()
|| mOverScrollX != mScroller.getCurrX()) {
scrollTo(mScroller.getCurrX(), mScroller.getCurrY());
}
invalidate();
return true;
} else if (mNextPage != INVALID_PAGE) {
mCurrentPage = Math.max(0, Math.min(mNextPage, getPageCount() - 1));
mNextPage = INVALID_PAGE;
notifyPageSwitched();
// We don't want to trigger a page end moving unless the page has settled
// and the user has stopped scrolling
if (mTouchState == TOUCH_STATE_REST) {
pageEndMoving();
}
onPostReorderingAnimationCompleted();
return true;
}
return false;
}
@Override
public void computeScroll() {
computeScrollHelper();
}
protected boolean shouldSetTopAlignedPivotForWidget(int childIndex) {
return mTopAlignPageWhenShrinkingForBouncer;
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
if (!mIsDataReady || getChildCount() == 0) {
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
return;
}
// We measure the dimensions of the PagedView to be larger than the pages so that when we
// zoom out (and scale down), the view is still contained in the parent
View parent = (View) getParent();
int widthMode = MeasureSpec.getMode(widthMeasureSpec);
int widthSize = MeasureSpec.getSize(widthMeasureSpec);
int heightMode = MeasureSpec.getMode(heightMeasureSpec);
int heightSize = MeasureSpec.getSize(heightMeasureSpec);
// NOTE: We multiply by 1.5f to account for the fact that depending on the offset of the
// viewport, we can be at most one and a half screens offset once we scale down
DisplayMetrics dm = getResources().getDisplayMetrics();
int maxSize = Math.max(dm.widthPixels, dm.heightPixels);
int parentWidthSize = (int) (1.5f * maxSize);
int parentHeightSize = maxSize;
int scaledWidthSize = (int) (parentWidthSize / mMinScale);
int scaledHeightSize = (int) (parentHeightSize / mMinScale);
mViewport.set(0, 0, widthSize, heightSize);
if (widthMode == MeasureSpec.UNSPECIFIED || heightMode == MeasureSpec.UNSPECIFIED) {
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
return;
}
// Return early if we aren't given a proper dimension
if (widthSize <= 0 || heightSize <= 0) {
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
return;
}
/* Allow the height to be set as WRAP_CONTENT. This allows the particular case
* of the All apps view on XLarge displays to not take up more space then it needs. Width
* is still not allowed to be set as WRAP_CONTENT since many parts of the code expect
* each page to have the same width.
*/
final int verticalPadding = getPaddingTop() + getPaddingBottom();
final int horizontalPadding = getPaddingLeft() + getPaddingRight();
// The children are given the same width and height as the workspace
// unless they were set to WRAP_CONTENT
if (DEBUG) Log.d(TAG, "PagedView.onMeasure(): " + widthSize + ", " + heightSize);
if (DEBUG) Log.d(TAG, "PagedView.scaledSize: " + scaledWidthSize + ", " + scaledHeightSize);
if (DEBUG) Log.d(TAG, "PagedView.parentSize: " + parentWidthSize + ", " + parentHeightSize);
if (DEBUG) Log.d(TAG, "PagedView.horizontalPadding: " + horizontalPadding);
if (DEBUG) Log.d(TAG, "PagedView.verticalPadding: " + verticalPadding);
final int childCount = getChildCount();
for (int i = 0; i < childCount; i++) {
// disallowing padding in paged view (just pass 0)
final View child = getPageAt(i);
final LayoutParams lp = (LayoutParams) child.getLayoutParams();
int childWidthMode;
if (lp.width == LayoutParams.WRAP_CONTENT) {
childWidthMode = MeasureSpec.AT_MOST;
} else {
childWidthMode = MeasureSpec.EXACTLY;
}
int childHeightMode;
if (lp.height == LayoutParams.WRAP_CONTENT) {
childHeightMode = MeasureSpec.AT_MOST;
} else {
childHeightMode = MeasureSpec.EXACTLY;
}
final int childWidthMeasureSpec =
MeasureSpec.makeMeasureSpec(widthSize - horizontalPadding, childWidthMode);
final int childHeightMeasureSpec =
MeasureSpec.makeMeasureSpec(heightSize - verticalPadding, childHeightMode);
child.measure(childWidthMeasureSpec, childHeightMeasureSpec);
}
setMeasuredDimension(scaledWidthSize, scaledHeightSize);
// We can't call getChildOffset/getRelativeChildOffset until we set the measured dimensions.
// We also wait until we set the measured dimensions before flushing the cache as well, to
// ensure that the cache is filled with good values.
invalidateCachedOffsets();
if (mChildCountOnLastMeasure != getChildCount() && !mDeferringForDelete) {
setCurrentPage(mCurrentPage);
}
mChildCountOnLastMeasure = getChildCount();
if (childCount > 0) {
if (DEBUG) Log.d(TAG, "getRelativeChildOffset(): " + getViewportWidth() + ", "
+ getChildWidth(0));
// Calculate the variable page spacing if necessary
if (mPageSpacing == AUTOMATIC_PAGE_SPACING) {
// The gap between pages in the PagedView should be equal to the gap from the page
// to the edge of the screen (so it is not visible in the current screen). To
// account for unequal padding on each side of the paged view, we take the maximum
// of the left/right gap and use that as the gap between each page.
int offset = getRelativeChildOffset(0);
int spacing = Math.max(offset, widthSize - offset -
getChildAt(0).getMeasuredWidth());
setPageSpacing(spacing);
}
}
updateScrollingIndicatorPosition();
if (childCount > 0) {
mMaxScrollX = getChildOffset(childCount - 1) - getRelativeChildOffset(childCount - 1);
} else {
mMaxScrollX = 0;
}
}
public void setPageSpacing(int pageSpacing) {
mPageSpacing = pageSpacing;
invalidateCachedOffsets();
}
@Override
protected void onLayout(boolean changed, int left, int top, int right, int bottom) {
if (!mIsDataReady || getChildCount() == 0) {
return;
}
if (DEBUG) Log.d(TAG, "PagedView.onLayout()");
final int childCount = getChildCount();
int offsetX = getViewportOffsetX();
int offsetY = getViewportOffsetY();
// Update the viewport offsets
mViewport.offset(offsetX, offsetY);
int childLeft = offsetX + getRelativeChildOffset(0);
for (int i = 0; i < childCount; i++) {
final View child = getPageAt(i);
int childTop = offsetY + getPaddingTop();
if (child.getVisibility() != View.GONE) {
final int childWidth = getScaledMeasuredWidth(child);
final int childHeight = child.getMeasuredHeight();
if (DEBUG) Log.d(TAG, "\tlayout-child" + i + ": " + childLeft + ", " + childTop);
child.layout(childLeft, childTop,
childLeft + child.getMeasuredWidth(), childTop + childHeight);
childLeft += childWidth + mPageSpacing;
}
}
if (mFirstLayout && mCurrentPage >= 0 && mCurrentPage < getChildCount()) {
setHorizontalScrollBarEnabled(false);
updateCurrentPageScroll();
setHorizontalScrollBarEnabled(true);
mFirstLayout = false;
}
}
protected void screenScrolled(int screenCenter) {
}
@Override
public void onChildViewAdded(View parent, View child) {
// This ensures that when children are added, they get the correct transforms / alphas
// in accordance with any scroll effects.
mForceScreenScrolled = true;
invalidate();
invalidateCachedOffsets();
}
@Override
public void onChildViewRemoved(View parent, View child) {
mForceScreenScrolled = true;
invalidate();
invalidateCachedOffsets();
}
protected void invalidateCachedOffsets() {
int count = getChildCount();
if (count == 0) {
mChildOffsets = null;
mChildRelativeOffsets = null;
mChildOffsetsWithLayoutScale = null;
return;
}
mChildOffsets = new int[count];
mChildRelativeOffsets = new int[count];
mChildOffsetsWithLayoutScale = new int[count];
for (int i = 0; i < count; i++) {
mChildOffsets[i] = -1;
mChildRelativeOffsets[i] = -1;
mChildOffsetsWithLayoutScale[i] = -1;
}
}
protected int getChildOffset(int index) {
if (index < 0 || index > getChildCount() - 1) return 0;
int[] childOffsets = Float.compare(mLayoutScale, 1f) == 0 ?
mChildOffsets : mChildOffsetsWithLayoutScale;
if (childOffsets != null && childOffsets[index] != -1) {
return childOffsets[index];
} else {
if (getChildCount() == 0)
return 0;
int offset = getRelativeChildOffset(0);
for (int i = 0; i < index; ++i) {
offset += getScaledMeasuredWidth(getPageAt(i)) + mPageSpacing;
}
if (childOffsets != null) {
childOffsets[index] = offset;
}
return offset;
}
}
protected int getRelativeChildOffset(int index) {
if (index < 0 || index > getChildCount() - 1) return 0;
if (mChildRelativeOffsets != null && mChildRelativeOffsets[index] != -1) {
return mChildRelativeOffsets[index];
} else {
final int padding = getPaddingLeft() + getPaddingRight();
final int offset = getPaddingLeft() +
(getViewportWidth() - padding - getChildWidth(index)) / 2;
if (mChildRelativeOffsets != null) {
mChildRelativeOffsets[index] = offset;
}
return offset;
}
}
protected int getScaledMeasuredWidth(View child) {
// This functions are called enough times that it actually makes a difference in the
// profiler -- so just inline the max() here
final int measuredWidth = child.getMeasuredWidth();
final int minWidth = mMinimumWidth;
final int maxWidth = (minWidth > measuredWidth) ? minWidth : measuredWidth;
return (int) (maxWidth * mLayoutScale + 0.5f);
}
void boundByReorderablePages(boolean isReordering, int[] range) {
// Do nothing
}
// TODO: Fix this
protected void getVisiblePages(int[] range) {
range[0] = 0;
range[1] = getPageCount() - 1;
/*
final int pageCount = getChildCount();
if (pageCount > 0) {
final int screenWidth = getViewportWidth();
int leftScreen = 0;
int rightScreen = 0;
int offsetX = getViewportOffsetX() + getScrollX();
View currPage = getPageAt(leftScreen);
while (leftScreen < pageCount - 1 &&
currPage.getX() + currPage.getWidth() -
currPage.getPaddingRight() < offsetX) {
leftScreen++;
currPage = getPageAt(leftScreen);
}
rightScreen = leftScreen;
currPage = getPageAt(rightScreen + 1);
while (rightScreen < pageCount - 1 &&
currPage.getX() - currPage.getPaddingLeft() < offsetX + screenWidth) {
rightScreen++;
currPage = getPageAt(rightScreen + 1);
}
// TEMP: this is a hacky way to ensure that animations to new pages are not clipped
// because we don't draw them while scrolling?
range[0] = Math.max(0, leftScreen - 1);
range[1] = Math.min(rightScreen + 1, getChildCount() - 1);
} else {
range[0] = -1;
range[1] = -1;
}
*/
}
protected boolean shouldDrawChild(View child) {
return child.getAlpha() > 0;
}
@Override
protected void dispatchDraw(Canvas canvas) {
int halfScreenSize = getViewportWidth() / 2;
// mOverScrollX is equal to getScrollX() when we're within the normal scroll range.
// Otherwise it is equal to the scaled overscroll position.
int screenCenter = mOverScrollX + halfScreenSize;
if (screenCenter != mLastScreenCenter || mForceScreenScrolled) {
// set mForceScreenScrolled before calling screenScrolled so that screenScrolled can
// set it for the next frame
mForceScreenScrolled = false;
screenScrolled(screenCenter);
mLastScreenCenter = screenCenter;
}
// Find out which screens are visible; as an optimization we only call draw on them
final int pageCount = getChildCount();
if (pageCount > 0) {
getVisiblePages(mTempVisiblePagesRange);
final int leftScreen = mTempVisiblePagesRange[0];
final int rightScreen = mTempVisiblePagesRange[1];
if (leftScreen != -1 && rightScreen != -1) {
final long drawingTime = getDrawingTime();
// Clip to the bounds
canvas.save();
canvas.clipRect(getScrollX(), getScrollY(), getScrollX() + getRight() - getLeft(),
getScrollY() + getBottom() - getTop());
// Draw all the children, leaving the drag view for last
for (int i = pageCount - 1; i >= 0; i--) {
final View v = getPageAt(i);
if (v == mDragView) continue;
if (mForceDrawAllChildrenNextFrame ||
(leftScreen <= i && i <= rightScreen && shouldDrawChild(v))) {
drawChild(canvas, v, drawingTime);
}
}
// Draw the drag view on top (if there is one)
if (mDragView != null) {
drawChild(canvas, mDragView, drawingTime);
}
mForceDrawAllChildrenNextFrame = false;
canvas.restore();
}
}
}
@Override
public boolean requestChildRectangleOnScreen(View child, Rect rectangle, boolean immediate) {
int page = indexToPage(indexOfChild(child));
if (page != mCurrentPage || !mScroller.isFinished()) {
snapToPage(page);
return true;
}
return false;
}
@Override
protected boolean onRequestFocusInDescendants(int direction, Rect previouslyFocusedRect) {
int focusablePage;
if (mNextPage != INVALID_PAGE) {
focusablePage = mNextPage;
} else {
focusablePage = mCurrentPage;
}
View v = getPageAt(focusablePage);
if (v != null) {
return v.requestFocus(direction, previouslyFocusedRect);
}
return false;
}
@Override
public boolean dispatchUnhandledMove(View focused, int direction) {
if (direction == View.FOCUS_LEFT) {
if (getCurrentPage() > 0) {
snapToPage(getCurrentPage() - 1);
return true;
}
} else if (direction == View.FOCUS_RIGHT) {
if (getCurrentPage() < getPageCount() - 1) {
snapToPage(getCurrentPage() + 1);
return true;
}
}
return super.dispatchUnhandledMove(focused, direction);
}
@Override
public void addFocusables(ArrayList<View> views, int direction, int focusableMode) {
if (mCurrentPage >= 0 && mCurrentPage < getPageCount()) {
getPageAt(mCurrentPage).addFocusables(views, direction, focusableMode);
}
if (direction == View.FOCUS_LEFT) {
if (mCurrentPage > 0) {
getPageAt(mCurrentPage - 1).addFocusables(views, direction, focusableMode);
}
} else if (direction == View.FOCUS_RIGHT){
if (mCurrentPage < getPageCount() - 1) {
getPageAt(mCurrentPage + 1).addFocusables(views, direction, focusableMode);
}
}
}
/**
* If one of our descendant views decides that it could be focused now, only
* pass that along if it's on the current page.
*
* This happens when live folders requery, and if they're off page, they
* end up calling requestFocus, which pulls it on page.
*/
@Override
public void focusableViewAvailable(View focused) {
View current = getPageAt(mCurrentPage);
View v = focused;
while (true) {
if (v == current) {
super.focusableViewAvailable(focused);
return;
}
if (v == this) {
return;
}
ViewParent parent = v.getParent();
if (parent instanceof View) {
v = (View)v.getParent();
} else {
return;
}
}
}
/**
* Return true if a tap at (x, y) should trigger a flip to the previous page.
*/
protected boolean hitsPreviousPage(float x, float y) {
return (x < getViewportOffsetX() + getRelativeChildOffset(mCurrentPage) - mPageSpacing);
}
/**
* Return true if a tap at (x, y) should trigger a flip to the next page.
*/
protected boolean hitsNextPage(float x, float y) {
return (x > (getViewportOffsetX() + getViewportWidth() - getRelativeChildOffset(mCurrentPage) + mPageSpacing));
}
/** Returns whether x and y originated within the buffered viewport */
private boolean isTouchPointInViewportWithBuffer(int x, int y) {
mTmpRect.set(mViewport.left - mViewport.width() / 2, mViewport.top,
mViewport.right + mViewport.width() / 2, mViewport.bottom);
return mTmpRect.contains(x, y);
}
/** Returns whether x and y originated within the current page view bounds */
private boolean isTouchPointInCurrentPage(int x, int y) {
View v = getPageAt(getCurrentPage());
if (v != null) {
mTmpRect.set((v.getLeft() - getScrollX()), 0, (v.getRight() - getScrollX()),
v.getBottom());
return mTmpRect.contains(x, y);
}
return false;
}
@Override
public boolean onInterceptTouchEvent(MotionEvent ev) {
if (DISABLE_TOUCH_INTERACTION) {
return false;
}
/*
* This method JUST determines whether we want to intercept the motion.
* If we return true, onTouchEvent will be called and we do the actual
* scrolling there.
*/
acquireVelocityTrackerAndAddMovement(ev);
// Skip touch handling if there are no pages to swipe
if (getChildCount() <= 0) return super.onInterceptTouchEvent(ev);
/*
* Shortcut the most recurring case: the user is in the dragging
* state and he is moving his finger. We want to intercept this
* motion.
*/
final int action = ev.getAction();
if ((action == MotionEvent.ACTION_MOVE) &&
(mTouchState == TOUCH_STATE_SCROLLING)) {
return true;
}
switch (action & MotionEvent.ACTION_MASK) {
case MotionEvent.ACTION_MOVE: {
/*
* mIsBeingDragged == false, otherwise the shortcut would have caught it. Check
* whether the user has moved far enough from his original down touch.
*/
if (mActivePointerId != INVALID_POINTER) {
if (mIsCameraEvent || determineScrollingStart(ev)) {
startScrolling(ev);
}
break;
}
// if mActivePointerId is INVALID_POINTER, then we must have missed an ACTION_DOWN
// event. in that case, treat the first occurence of a move event as a ACTION_DOWN
// i.e. fall through to the next case (don't break)
// (We sometimes miss ACTION_DOWN events in Workspace because it ignores all events
// while it's small- this was causing a crash before we checked for INVALID_POINTER)
break;
}
case MotionEvent.ACTION_DOWN: {
if (mIsCameraEvent) {
animateWarpPageOnScreen("interceptTouch(): DOWN");
}
// Remember where the motion event started
saveDownState(ev);
/*
* If being flinged and user touches the screen, initiate drag;
* otherwise don't. mScroller.isFinished should be false when
* being flinged.
*/
final int xDist = Math.abs(mScroller.getFinalX() - mScroller.getCurrX());
final boolean finishedScrolling = (mScroller.isFinished() || xDist < mTouchSlop);
if (finishedScrolling) {
setTouchState(TOUCH_STATE_REST);
mScroller.abortAnimation();
} else {
if (mIsCameraEvent || isTouchPointInViewportWithBuffer(
(int) mDownMotionX, (int) mDownMotionY)) {
setTouchState(TOUCH_STATE_SCROLLING);
} else {
setTouchState(TOUCH_STATE_REST);
}
}
// check if this can be the beginning of a tap on the side of the pages
// to scroll the current page
if (!DISABLE_TOUCH_SIDE_PAGES) {
if (mTouchState != TOUCH_STATE_PREV_PAGE
&& mTouchState != TOUCH_STATE_NEXT_PAGE) {
if (getChildCount() > 0) {
float x = ev.getX();
float y = ev.getY();
if (hitsPreviousPage(x, y)) {
setTouchState(TOUCH_STATE_PREV_PAGE);
} else if (hitsNextPage(x, y)) {
setTouchState(TOUCH_STATE_NEXT_PAGE);
}
}
}
}
break;
}
case MotionEvent.ACTION_UP:
case MotionEvent.ACTION_CANCEL:
resetTouchState();
// Just intercept the touch event on up if we tap outside the strict viewport
if (!isTouchPointInCurrentPage((int) mLastMotionX, (int) mLastMotionY)) {
return true;
}
break;
case MotionEvent.ACTION_POINTER_UP:
onSecondaryPointerUp(ev);
releaseVelocityTracker();
break;
}
/*
* The only time we want to intercept motion events is if we are in the
* drag mode.
*/
return mTouchState != TOUCH_STATE_REST;
}
private void setTouchState(int touchState) {
if (mTouchState != touchState) {
if (DEBUG_WARP) Log.v(TAG, "mTouchState changing to " + touchState);
onTouchStateChanged(touchState);
mTouchState = touchState;
}
}
void onTouchStateChanged(int newTouchState) {
if (DEBUG) {
Log.v(TAG, "onTouchStateChanged(old="+ mTouchState + ", new=" + newTouchState + ")");
}
}
/**
* Save the state when we get {@link MotionEvent#ACTION_DOWN}
* @param ev
*/
private void saveDownState(MotionEvent ev) {
// Remember where the motion event started
mDownMotionX = mLastMotionX = ev.getX();
mDownMotionY = mLastMotionY = ev.getY();
mDownScrollX = getScrollX();
float[] p = mapPointFromViewToParent(this, mLastMotionX, mLastMotionY);
mParentDownMotionX = p[0];
mParentDownMotionY = p[1];
mLastMotionXRemainder = 0;
mTotalMotionX = 0;
mActivePointerId = ev.getPointerId(0);
// Determine if the down event is within the threshold to be an edge swipe
int leftEdgeBoundary = getViewportOffsetX() + mEdgeSwipeRegionSize;
int rightEdgeBoundary = getMeasuredWidth() - getViewportOffsetX() - mEdgeSwipeRegionSize;
if ((mDownMotionX <= leftEdgeBoundary || mDownMotionX >= rightEdgeBoundary)) {
mDownEventOnEdge = true;
}
}
private boolean isHorizontalCameraScroll(MotionEvent ev) {
// Disallow scrolling if we don't have a valid pointer index
final int pointerIndex = ev.findPointerIndex(mActivePointerId);
if (pointerIndex == -1) return false;
// If we're only allowing edge swipes, we break out early if the down event wasn't
// at the edge.
if (mOnlyAllowEdgeSwipes && !mDownEventOnEdge) return false;
final float x = ev.getX(pointerIndex);
final int xDiff = (int) Math.abs(x - mDownMotionX);
final int touchSlop = Math.round(TOUCH_SLOP_SCALE * mTouchSlop);
boolean xPaged = xDiff > mPagingTouchSlop;
boolean xMoved = xDiff > touchSlop;
return mIsCameraEvent && (mUsePagingTouchSlop ? xPaged : xMoved);
}
/*
* Determines if we should change the touch state to start scrolling after the
* user moves their touch point too far.
*/
protected boolean determineScrollingStart(MotionEvent ev) {
// Disallow scrolling if we don't have a valid pointer index
final int pointerIndex = ev.findPointerIndex(mActivePointerId);
if (pointerIndex == -1) return false;
// Disallow scrolling if we started the gesture from outside the viewport
final float x = ev.getX(pointerIndex);
final float y = ev.getY(pointerIndex);
if (!isTouchPointInViewportWithBuffer((int) x, (int) y)) return false;
// If we're only allowing edge swipes, we break out early if the down event wasn't
// at the edge.
if (mOnlyAllowEdgeSwipes && !mDownEventOnEdge) return false;
final int xDiff = (int) Math.abs(x - mLastMotionX);
final int touchSlop = Math.round(TOUCH_SLOP_SCALE * mTouchSlop);
boolean xPaged = xDiff > mPagingTouchSlop;
boolean xMoved = xDiff > touchSlop;
return mUsePagingTouchSlop ? xPaged : xMoved;
}
private void startScrolling(MotionEvent ev) {
// Ignore if we don't have a valid pointer index
final int pointerIndex = ev.findPointerIndex(mActivePointerId);
if (pointerIndex == -1) return;
final float x = ev.getX(pointerIndex);
setTouchState(TOUCH_STATE_SCROLLING);
mTotalMotionX += Math.abs(mLastMotionX - x);
mLastMotionX = x;
mLastMotionXRemainder = 0;
mTouchX = getViewportOffsetX() + getScrollX();
mSmoothingTime = System.nanoTime() / NANOTIME_DIV;
pageBeginMoving();
}
protected float getMaxScrollProgress() {
return 1.0f;
}
protected float getBoundedScrollProgress(int screenCenter, View v, int page) {
final int halfScreenSize = getViewportWidth() / 2;
screenCenter = Math.min(mScrollX + halfScreenSize, screenCenter);
screenCenter = Math.max(halfScreenSize, screenCenter);
return getScrollProgress(screenCenter, v, page);
}
protected float getScrollProgress(int screenCenter, View v, int page) {
final int halfScreenSize = getViewportWidth() / 2;
int totalDistance = getScaledMeasuredWidth(v) + mPageSpacing;
int delta = screenCenter - (getChildOffset(page) -
getRelativeChildOffset(page) + halfScreenSize);
float scrollProgress = delta / (totalDistance * 1.0f);
scrollProgress = Math.min(scrollProgress, getMaxScrollProgress());
scrollProgress = Math.max(scrollProgress, - getMaxScrollProgress());
return scrollProgress;
}
// This curve determines how the effect of scrolling over the limits of the page dimishes
// as the user pulls further and further from the bounds
private float overScrollInfluenceCurve(float f) {
f -= 1.0f;
return f * f * f + 1.0f;
}
protected void acceleratedOverScroll(float amount) {
int screenSize = getViewportWidth();
// We want to reach the max over scroll effect when the user has
// over scrolled half the size of the screen
float f = OVERSCROLL_ACCELERATE_FACTOR * (amount / screenSize);
if (f == 0) return;
// Clamp this factor, f, to -1 < f < 1
if (Math.abs(f) >= 1) {
f /= Math.abs(f);
}
int overScrollAmount = (int) Math.round(f * screenSize);
if (amount < 0) {
mOverScrollX = overScrollAmount;
super.scrollTo(0, getScrollY());
} else {
mOverScrollX = mMaxScrollX + overScrollAmount;
super.scrollTo(mMaxScrollX, getScrollY());
}
invalidate();
}
protected void dampedOverScroll(float amount) {
int screenSize = getViewportWidth();
float f = (amount / screenSize);
if (f == 0) return;
f = f / (Math.abs(f)) * (overScrollInfluenceCurve(Math.abs(f)));
// Clamp this factor, f, to -1 < f < 1
if (Math.abs(f) >= 1) {
f /= Math.abs(f);
}
int overScrollAmount = (int) Math.round(OVERSCROLL_DAMP_FACTOR * f * screenSize);
if (amount < 0) {
mOverScrollX = overScrollAmount;
super.scrollTo(0, getScrollY());
} else {
mOverScrollX = mMaxScrollX + overScrollAmount;
super.scrollTo(mMaxScrollX, getScrollY());
}
invalidate();
}
protected void overScroll(float amount) {
dampedOverScroll(amount);
}
protected float maxOverScroll() {
// Using the formula in overScroll, assuming that f = 1.0 (which it should generally not
// exceed). Used to find out how much extra wallpaper we need for the over scroll effect
float f = 1.0f;
f = f / (Math.abs(f)) * (overScrollInfluenceCurve(Math.abs(f)));
return OVERSCROLL_DAMP_FACTOR * f;
}
@Override
public boolean onTouchEvent(MotionEvent ev) {
if (DISABLE_TOUCH_INTERACTION) {
return false;
}
// Skip touch handling if there are no pages to swipe
if (getChildCount() <= 0) return super.onTouchEvent(ev);
acquireVelocityTrackerAndAddMovement(ev);
final int action = ev.getAction();
switch (action & MotionEvent.ACTION_MASK) {
case MotionEvent.ACTION_DOWN:
/*
* If being flinged and user touches, stop the fling. isFinished
* will be false if being flinged.
*/
if (!mScroller.isFinished()) {
mScroller.abortAnimation();
}
// Remember where the motion event started
saveDownState(ev);
if (mTouchState == TOUCH_STATE_SCROLLING) {
pageBeginMoving();
} else {
setTouchState(TOUCH_STATE_READY);
}
if (mIsCameraEvent) {
animateWarpPageOnScreen("onTouch(): DOWN");
}
break;
case MotionEvent.ACTION_MOVE:
if (mTouchState == TOUCH_STATE_SCROLLING) {
// Scroll to follow the motion event
final int pointerIndex = ev.findPointerIndex(mActivePointerId);
if (pointerIndex == -1) return true;
final float x = ev.getX(pointerIndex);
final float deltaX = mLastMotionX + mLastMotionXRemainder - x;
mTotalMotionX += Math.abs(deltaX);
// Only scroll and update mLastMotionX if we have moved some discrete amount. We
// keep the remainder because we are actually testing if we've moved from the last
// scrolled position (which is discrete).
if (Math.abs(deltaX) >= 1.0f) {
mTouchX += deltaX;
mSmoothingTime = System.nanoTime() / NANOTIME_DIV;
if (isWarping()) {
KeyguardWidgetFrame v = (KeyguardWidgetFrame) getPageAt(getPageWarpIndex());
v.setTranslationX(v.getTranslationX() - deltaX);
} else if (!mDeferScrollUpdate) {
scrollBy((int) deltaX, 0);
if (DEBUG) Log.d(TAG, "onTouchEvent().Scrolling: " + deltaX);
} else {
invalidate();
}
mLastMotionX = x;
mLastMotionXRemainder = deltaX - (int) deltaX;
} else {
awakenScrollBars();
}
} else if (mTouchState == TOUCH_STATE_REORDERING) {
// Update the last motion position
mLastMotionX = ev.getX();
mLastMotionY = ev.getY();
// Update the parent down so that our zoom animations take this new movement into
// account
float[] pt = mapPointFromViewToParent(this, mLastMotionX, mLastMotionY);
mParentDownMotionX = pt[0];
mParentDownMotionY = pt[1];
updateDragViewTranslationDuringDrag();
// Find the closest page to the touch point
final int dragViewIndex = indexOfChild(mDragView);
int bufferSize = (int) (REORDERING_SIDE_PAGE_BUFFER_PERCENTAGE *
getViewportWidth());
int leftBufferEdge = (int) (mapPointFromViewToParent(this, mViewport.left, 0)[0]
+ bufferSize);
int rightBufferEdge = (int) (mapPointFromViewToParent(this, mViewport.right, 0)[0]
- bufferSize);
// Change the drag view if we are hovering over the drop target
boolean isHoveringOverDelete = isHoveringOverDeleteDropTarget(
(int) mParentDownMotionX, (int) mParentDownMotionY);
setPageHoveringOverDeleteDropTarget(dragViewIndex, isHoveringOverDelete);
if (DEBUG) Log.d(TAG, "leftBufferEdge: " + leftBufferEdge);
if (DEBUG) Log.d(TAG, "rightBufferEdge: " + rightBufferEdge);
if (DEBUG) Log.d(TAG, "mLastMotionX: " + mLastMotionX);
if (DEBUG) Log.d(TAG, "mLastMotionY: " + mLastMotionY);
if (DEBUG) Log.d(TAG, "mParentDownMotionX: " + mParentDownMotionX);
if (DEBUG) Log.d(TAG, "mParentDownMotionY: " + mParentDownMotionY);
float parentX = mParentDownMotionX;
int pageIndexToSnapTo = -1;
if (parentX < leftBufferEdge && dragViewIndex > 0) {
pageIndexToSnapTo = dragViewIndex - 1;
} else if (parentX > rightBufferEdge && dragViewIndex < getChildCount() - 1) {
pageIndexToSnapTo = dragViewIndex + 1;
}
final int pageUnderPointIndex = pageIndexToSnapTo;
if (pageUnderPointIndex > -1 && !isHoveringOverDelete) {
mTempVisiblePagesRange[0] = 0;
mTempVisiblePagesRange[1] = getPageCount() - 1;
boundByReorderablePages(true, mTempVisiblePagesRange);
if (mTempVisiblePagesRange[0] <= pageUnderPointIndex &&
pageUnderPointIndex <= mTempVisiblePagesRange[1] &&
pageUnderPointIndex != mSidePageHoverIndex && mScroller.isFinished()) {
mSidePageHoverIndex = pageUnderPointIndex;
mSidePageHoverRunnable = new Runnable() {
@Override
public void run() {
// Update the down scroll position to account for the fact that the
// current page is moved
mDownScrollX = getChildOffset(pageUnderPointIndex)
- getRelativeChildOffset(pageUnderPointIndex);
// Setup the scroll to the correct page before we swap the views
snapToPage(pageUnderPointIndex);
// For each of the pages between the paged view and the drag view,
// animate them from the previous position to the new position in
// the layout (as a result of the drag view moving in the layout)
int shiftDelta = (dragViewIndex < pageUnderPointIndex) ? -1 : 1;
int lowerIndex = (dragViewIndex < pageUnderPointIndex) ?
dragViewIndex + 1 : pageUnderPointIndex;
int upperIndex = (dragViewIndex > pageUnderPointIndex) ?
dragViewIndex - 1 : pageUnderPointIndex;
for (int i = lowerIndex; i <= upperIndex; ++i) {
View v = getChildAt(i);
// dragViewIndex < pageUnderPointIndex, so after we remove the
// drag view all subsequent views to pageUnderPointIndex will
// shift down.
int oldX = getViewportOffsetX() + getChildOffset(i);
int newX = getViewportOffsetX() + getChildOffset(i + shiftDelta);
// Animate the view translation from its old position to its new
// position
AnimatorSet anim = (AnimatorSet) v.getTag();
if (anim != null) {
anim.cancel();
}
v.setTranslationX(oldX - newX);
anim = new AnimatorSet();
anim.setDuration(REORDERING_REORDER_REPOSITION_DURATION);
anim.playTogether(
ObjectAnimator.ofFloat(v, "translationX", 0f));
anim.start();
v.setTag(anim);
}
removeView(mDragView);
onRemoveView(mDragView, false);
addView(mDragView, pageUnderPointIndex);
onAddView(mDragView, pageUnderPointIndex);
mSidePageHoverIndex = -1;
}
};
postDelayed(mSidePageHoverRunnable, REORDERING_SIDE_PAGE_HOVER_TIMEOUT);
}
} else {
removeCallbacks(mSidePageHoverRunnable);
mSidePageHoverIndex = -1;
}
} else if (determineScrollingStart(ev)) {
startScrolling(ev);
} else if (isHorizontalCameraScroll(ev)) {
startScrolling(ev);
// we need to cancel the camera animation
KeyguardWidgetFrame v = (KeyguardWidgetFrame) getPageAt(getPageWarpIndex());
v.animate().cancel();
}
break;
case MotionEvent.ACTION_UP:
if (mTouchState == TOUCH_STATE_SCROLLING) {
final int activePointerId = mActivePointerId;
final int pointerIndex = ev.findPointerIndex(activePointerId);
if (pointerIndex == -1) return true;
final float x = ev.getX(pointerIndex);
final VelocityTracker velocityTracker = mVelocityTracker;
velocityTracker.computeCurrentVelocity(1000, mMaximumVelocity);
int velocityX = (int) velocityTracker.getXVelocity(activePointerId);
final int deltaX = (int) (x - mDownMotionX);
final int pageWidth = getScaledMeasuredWidth(getPageAt(mCurrentPage));
boolean isSignificantMove = Math.abs(deltaX) > pageWidth *
SIGNIFICANT_MOVE_THRESHOLD;
mTotalMotionX += Math.abs(mLastMotionX + mLastMotionXRemainder - x);
boolean isFling = mTotalMotionX > MIN_LENGTH_FOR_FLING &&
Math.abs(velocityX) > mFlingThresholdVelocity;
// In the case that the page is moved far to one direction and then is flung
// in the opposite direction, we use a threshold to determine whether we should
// just return to the starting page, or if we should skip one further.
boolean returnToOriginalPage = false;
if (Math.abs(deltaX) > pageWidth * RETURN_TO_ORIGINAL_PAGE_THRESHOLD &&
Math.signum(velocityX) != Math.signum(deltaX) && isFling) {
returnToOriginalPage = true;
}
int finalPage;
// We give flings precedence over large moves, which is why we short-circuit our
// test for a large move if a fling has been registered. That is, a large
// move to the left and fling to the right will register as a fling to the right.
if (((isSignificantMove && deltaX > 0 && !isFling) ||
(isFling && velocityX > 0)) && mCurrentPage > 0) {
finalPage = returnToOriginalPage || isWarping()
? mCurrentPage : mCurrentPage - 1;
snapToPageWithVelocity(finalPage, velocityX);
} else if (((isSignificantMove && deltaX < 0 && !isFling) ||
(isFling && velocityX < 0)) &&
mCurrentPage < getChildCount() - 1) {
finalPage = returnToOriginalPage ? mCurrentPage :
isWarping() ? getPageWarpIndex() : mCurrentPage + 1;
snapToPageWithVelocity(finalPage, velocityX);
} else {
snapToDestination();
}
} else if (mTouchState == TOUCH_STATE_PREV_PAGE) {
// at this point we have not moved beyond the touch slop
// (otherwise mTouchState would be TOUCH_STATE_SCROLLING), so
// we can just page
int nextPage = Math.max(0, mCurrentPage - 1);
if (nextPage != mCurrentPage) {
snapToPage(nextPage);
} else {
snapToDestination();
}
} else if (mTouchState == TOUCH_STATE_NEXT_PAGE) {
// at this point we have not moved beyond the touch slop
// (otherwise mTouchState would be TOUCH_STATE_SCROLLING), so
// we can just page
int nextPage = Math.min(getChildCount() - 1, mCurrentPage + 1);
if (nextPage != mCurrentPage) {
snapToPage(nextPage);
} else {
snapToDestination();
}
} else if (mTouchState == TOUCH_STATE_REORDERING) {
// Update the last motion position
mLastMotionX = ev.getX();
mLastMotionY = ev.getY();
// Update the parent down so that our zoom animations take this new movement into
// account
float[] pt = mapPointFromViewToParent(this, mLastMotionX, mLastMotionY);
mParentDownMotionX = pt[0];
mParentDownMotionY = pt[1];
updateDragViewTranslationDuringDrag();
boolean handledFling = false;
if (!DISABLE_FLING_TO_DELETE) {
// Check the velocity and see if we are flinging-to-delete
PointF flingToDeleteVector = isFlingingToDelete();
if (flingToDeleteVector != null) {
onFlingToDelete(flingToDeleteVector);
handledFling = true;
}
}
if (!handledFling && isHoveringOverDeleteDropTarget((int) mParentDownMotionX,
(int) mParentDownMotionY)) {
onDropToDelete();
}
} else {
if (DEBUG_WARP) Log.v(TAG, "calling onUnhandledTap()");
if (mWarpPageExposed && !isAnimatingWarpPage()) {
animateWarpPageOffScreen("unhandled tap", true);
}
onUnhandledTap(ev);
}
// Remove the callback to wait for the side page hover timeout
removeCallbacks(mSidePageHoverRunnable);
// End any intermediate reordering states
resetTouchState();
break;
case MotionEvent.ACTION_CANCEL:
if (mTouchState == TOUCH_STATE_SCROLLING) {
snapToDestination();
}
resetTouchState();
break;
case MotionEvent.ACTION_POINTER_UP:
onSecondaryPointerUp(ev);
break;
}
return true;
}
//public abstract void onFlingToDelete(View v);
public abstract void onRemoveView(View v, boolean deletePermanently);
public abstract void onRemoveViewAnimationCompleted();
public abstract void onAddView(View v, int index);
private void resetTouchState() {
releaseVelocityTracker();
endReordering();
setTouchState(TOUCH_STATE_REST);
mActivePointerId = INVALID_POINTER;
mDownEventOnEdge = false;
}
protected void onUnhandledTap(MotionEvent ev) {}
@Override
public boolean onGenericMotionEvent(MotionEvent event) {
if ((event.getSource() & InputDevice.SOURCE_CLASS_POINTER) != 0) {
switch (event.getAction()) {
case MotionEvent.ACTION_SCROLL: {
// Handle mouse (or ext. device) by shifting the page depending on the scroll
final float vscroll;
final float hscroll;
if ((event.getMetaState() & KeyEvent.META_SHIFT_ON) != 0) {
vscroll = 0;
hscroll = event.getAxisValue(MotionEvent.AXIS_VSCROLL);
} else {
vscroll = -event.getAxisValue(MotionEvent.AXIS_VSCROLL);
hscroll = event.getAxisValue(MotionEvent.AXIS_HSCROLL);
}
if (hscroll != 0 || vscroll != 0) {
if (hscroll > 0 || vscroll > 0) {
scrollRight();
} else {
scrollLeft();
}
return true;
}
}
}
}
return super.onGenericMotionEvent(event);
}
private void acquireVelocityTrackerAndAddMovement(MotionEvent ev) {
if (mVelocityTracker == null) {
mVelocityTracker = VelocityTracker.obtain();
}
mVelocityTracker.addMovement(ev);
}
private void releaseVelocityTracker() {
if (mVelocityTracker != null) {
mVelocityTracker.recycle();
mVelocityTracker = null;
}
}
private void onSecondaryPointerUp(MotionEvent ev) {
final int pointerIndex = (ev.getAction() & MotionEvent.ACTION_POINTER_INDEX_MASK) >>
MotionEvent.ACTION_POINTER_INDEX_SHIFT;
final int pointerId = ev.getPointerId(pointerIndex);
if (pointerId == mActivePointerId) {
// This was our active pointer going up. Choose a new
// active pointer and adjust accordingly.
// TODO: Make this decision more intelligent.
final int newPointerIndex = pointerIndex == 0 ? 1 : 0;
mLastMotionX = mDownMotionX = ev.getX(newPointerIndex);
mLastMotionY = ev.getY(newPointerIndex);
mLastMotionXRemainder = 0;
mActivePointerId = ev.getPointerId(newPointerIndex);
if (mVelocityTracker != null) {
mVelocityTracker.clear();
}
}
}
@Override
public void requestChildFocus(View child, View focused) {
super.requestChildFocus(child, focused);
int page = indexToPage(indexOfChild(child));
if (page >= 0 && page != getCurrentPage() && !isInTouchMode()) {
snapToPage(page);
}
}
protected int getChildIndexForRelativeOffset(int relativeOffset) {
final int childCount = getChildCount();
int left;
int right;
for (int i = 0; i < childCount; ++i) {
left = getRelativeChildOffset(i);
right = (left + getScaledMeasuredWidth(getPageAt(i)));
if (left <= relativeOffset && relativeOffset <= right) {
return i;
}
}
return -1;
}
protected int getChildWidth(int index) {
// This functions are called enough times that it actually makes a difference in the
// profiler -- so just inline the max() here
final int measuredWidth = getPageAt(index).getMeasuredWidth();
final int minWidth = mMinimumWidth;
return (minWidth > measuredWidth) ? minWidth : measuredWidth;
}
int getPageNearestToPoint(float x) {
int index = 0;
for (int i = 0; i < getChildCount(); ++i) {
if (x < getChildAt(i).getRight() - getScrollX()) {
return index;
} else {
index++;
}
}
return Math.min(index, getChildCount() - 1);
}
int getPageNearestToCenterOfScreen() {
int minDistanceFromScreenCenter = Integer.MAX_VALUE;
int minDistanceFromScreenCenterIndex = -1;
int screenCenter = getViewportOffsetX() + getScrollX() + (getViewportWidth() / 2);
final int childCount = getChildCount();
for (int i = 0; i < childCount; ++i) {
View layout = (View) getPageAt(i);
int childWidth = getScaledMeasuredWidth(layout);
int halfChildWidth = (childWidth / 2);
int childCenter = getViewportOffsetX() + getChildOffset(i) + halfChildWidth;
int distanceFromScreenCenter = Math.abs(childCenter - screenCenter);
if (distanceFromScreenCenter < minDistanceFromScreenCenter) {
minDistanceFromScreenCenter = distanceFromScreenCenter;
minDistanceFromScreenCenterIndex = i;
}
}
return minDistanceFromScreenCenterIndex;
}
protected void snapToDestination() {
final int newPage = getPageNearestToCenterOfScreen();
if (isWarping()) {
cancelWarpAnimation("snapToDestination", mCurrentPage != newPage);
}
snapToPage(newPage, getPageSnapDuration());
}
private int getPageSnapDuration() {
return isWarping() ? WARP_SNAP_DURATION : PAGE_SNAP_ANIMATION_DURATION;
}
private static class ScrollInterpolator implements Interpolator {
public ScrollInterpolator() {
}
public float getInterpolation(float t) {
t -= 1.0f;
return t*t*t*t*t + 1;
}
}
// We want the duration of the page snap animation to be influenced by the distance that
// the screen has to travel, however, we don't want this duration to be effected in a
// purely linear fashion. Instead, we use this method to moderate the effect that the distance
// of travel has on the overall snap duration.
float distanceInfluenceForSnapDuration(float f) {
f -= 0.5f; // center the values about 0.
f *= 0.3f * Math.PI / 2.0f;
return (float) Math.sin(f);
}
protected void snapToPageWithVelocity(int whichPage, int velocity) {
whichPage = Math.max(0, Math.min(whichPage, getChildCount() - 1));
int halfScreenSize = getViewportWidth() / 2;
if (isWarping()) {
cancelWarpAnimation("snapToPageWithVelocity", mCurrentPage != whichPage);
}
if (DEBUG) Log.d(TAG, "snapToPage.getChildOffset(): " + getChildOffset(whichPage));
if (DEBUG) Log.d(TAG, "snapToPageWithVelocity.getRelativeChildOffset(): "
+ getViewportWidth() + ", " + getChildWidth(whichPage));
final int newX = getChildOffset(whichPage) - getRelativeChildOffset(whichPage);
int delta = newX - mUnboundedScrollX;
int duration = 0;
if (Math.abs(velocity) < mMinFlingVelocity) {
// If the velocity is low enough, then treat this more as an automatic page advance
// as opposed to an apparent physical response to flinging
snapToPage(whichPage, getPageSnapDuration());
return;
}
// Here we compute a "distance" that will be used in the computation of the overall
// snap duration. This is a function of the actual distance that needs to be traveled;
// we keep this value close to half screen size in order to reduce the variance in snap
// duration as a function of the distance the page needs to travel.
float distanceRatio = Math.min(1f, 1.0f * Math.abs(delta) / (2 * halfScreenSize));
float distance = halfScreenSize + halfScreenSize *
distanceInfluenceForSnapDuration(distanceRatio);
velocity = Math.abs(velocity);
velocity = Math.max(mMinSnapVelocity, velocity);
// we want the page's snap velocity to approximately match the velocity at which the
// user flings, so we scale the duration by a value near to the derivative of the scroll
// interpolator at zero, ie. 5. We use 4 to make it a little slower.
duration = 4 * Math.round(1000 * Math.abs(distance / velocity));
snapToPage(whichPage, delta, duration);
}
protected void snapToPage(int whichPage) {
snapToPage(whichPage, getPageSnapDuration());
}
protected void snapToPageImmediately(int whichPage) {
snapToPage(whichPage, getPageSnapDuration(), true);
}
protected void snapToPage(int whichPage, int duration) {
snapToPage(whichPage, duration, false);
}
protected void snapToPage(int whichPage, int duration, boolean immediate) {
whichPage = Math.max(0, Math.min(whichPage, getPageCount() - 1));
if (DEBUG) Log.d(TAG, "snapToPage.getChildOffset(): " + getChildOffset(whichPage));
if (DEBUG) Log.d(TAG, "snapToPage.getRelativeChildOffset(): " + getViewportWidth() + ", "
+ getChildWidth(whichPage));
int newX = getChildOffset(whichPage) - getRelativeChildOffset(whichPage);
final int sX = mUnboundedScrollX;
final int delta = newX - sX;
snapToPage(whichPage, delta, duration, immediate);
}
protected void snapToPage(int whichPage, int delta, int duration) {
snapToPage(whichPage, delta, duration, false);
}
protected void snapToPage(int whichPage, int delta, int duration, boolean immediate) {
if (isWarping() && whichPage == mCurrentPage+1) {
mNextPage = getPageWarpIndex(); // jump to the warp page
if (DEBUG_WARP) Log.v(TAG, "snapToPage(" + whichPage + ") : reset mPageSwapIndex");
} else {
mNextPage = whichPage;
}
if(mWarpPageExposed) {
dispatchOnPageEndWarp();
mWarpPageExposed = false;
}
notifyPageSwitching(whichPage);
View focusedChild = getFocusedChild();
if (focusedChild != null && whichPage != mCurrentPage &&
focusedChild == getPageAt(mCurrentPage)) {
focusedChild.clearFocus();
}
pageBeginMoving();
awakenScrollBars(duration);
if (immediate) {
duration = 0;
} else if (duration == 0) {
duration = Math.abs(delta);
}
if (!mScroller.isFinished()) mScroller.abortAnimation();
mScroller.startScroll(mUnboundedScrollX, 0, delta, 0, duration);
notifyPageSwitched();
// Trigger a compute() to finish switching pages if necessary
if (immediate) {
computeScroll();
}
mForceScreenScrolled = true;
invalidate();
}
protected boolean isWarping() {
return mWarpPageExposed;
}
public void scrollLeft() {
if (mScroller.isFinished()) {
if (mCurrentPage > 0) snapToPage(mCurrentPage - 1);
} else {
if (mNextPage > 0) snapToPage(mNextPage - 1);
}
}
public void scrollRight() {
if (mScroller.isFinished()) {
if (mCurrentPage < getChildCount() -1) snapToPage(mCurrentPage + 1);
} else {
if (mNextPage < getChildCount() -1) snapToPage(mNextPage + 1);
}
}
public int getPageForView(View v) {
int result = -1;
if (v != null) {
ViewParent vp = v.getParent();
int count = getChildCount();
for (int i = 0; i < count; i++) {
if (vp == getPageAt(i)) {
return i;
}
}
}
return result;
}
public static class SavedState extends BaseSavedState {
int currentPage = -1;
SavedState(Parcelable superState) {
super(superState);
}
private SavedState(Parcel in) {
super(in);
currentPage = in.readInt();
}
@Override
public void writeToParcel(Parcel out, int flags) {
super.writeToParcel(out, flags);
out.writeInt(currentPage);
}
public static final Parcelable.Creator<SavedState> CREATOR =
new Parcelable.Creator<SavedState>() {
public SavedState createFromParcel(Parcel in) {
return new SavedState(in);
}
public SavedState[] newArray(int size) {
return new SavedState[size];
}
};
}
protected View getScrollingIndicator() {
return null;
}
protected boolean isScrollingIndicatorEnabled() {
return false;
}
Runnable hideScrollingIndicatorRunnable = new Runnable() {
@Override
public void run() {
hideScrollingIndicator(false);
}
};
protected void flashScrollingIndicator(boolean animated) {
removeCallbacks(hideScrollingIndicatorRunnable);
showScrollingIndicator(!animated);
postDelayed(hideScrollingIndicatorRunnable, sScrollIndicatorFlashDuration);
}
protected void showScrollingIndicator(boolean immediately) {
mShouldShowScrollIndicator = true;
mShouldShowScrollIndicatorImmediately = true;
if (getChildCount() <= 1) return;
if (!isScrollingIndicatorEnabled()) return;
mShouldShowScrollIndicator = false;
getScrollingIndicator();
if (mScrollIndicator != null) {
// Fade the indicator in
updateScrollingIndicatorPosition();
mScrollIndicator.setVisibility(View.VISIBLE);
cancelScrollingIndicatorAnimations();
if (immediately) {
mScrollIndicator.setAlpha(1f);
} else {
mScrollIndicatorAnimator = ObjectAnimator.ofFloat(mScrollIndicator, "alpha", 1f);
mScrollIndicatorAnimator.setDuration(sScrollIndicatorFadeInDuration);
mScrollIndicatorAnimator.start();
}
}
}
protected void cancelScrollingIndicatorAnimations() {
if (mScrollIndicatorAnimator != null) {
mScrollIndicatorAnimator.cancel();
}
}
protected void hideScrollingIndicator(boolean immediately) {
if (getChildCount() <= 1) return;
if (!isScrollingIndicatorEnabled()) return;
getScrollingIndicator();
if (mScrollIndicator != null) {
// Fade the indicator out
updateScrollingIndicatorPosition();
cancelScrollingIndicatorAnimations();
if (immediately) {
mScrollIndicator.setVisibility(View.INVISIBLE);
mScrollIndicator.setAlpha(0f);
} else {
mScrollIndicatorAnimator = ObjectAnimator.ofFloat(mScrollIndicator, "alpha", 0f);
mScrollIndicatorAnimator.setDuration(sScrollIndicatorFadeOutDuration);
mScrollIndicatorAnimator.addListener(new AnimatorListenerAdapter() {
private boolean cancelled = false;
@Override
public void onAnimationCancel(android.animation.Animator animation) {
cancelled = true;
}
@Override
public void onAnimationEnd(Animator animation) {
if (!cancelled) {
mScrollIndicator.setVisibility(View.INVISIBLE);
}
}
});
mScrollIndicatorAnimator.start();
}
}
}
/**
* To be overridden by subclasses to determine whether the scroll indicator should stretch to
* fill its space on the track or not.
*/
protected boolean hasElasticScrollIndicator() {
return true;
}
private void updateScrollingIndicator() {
if (getChildCount() <= 1) return;
if (!isScrollingIndicatorEnabled()) return;
getScrollingIndicator();
if (mScrollIndicator != null) {
updateScrollingIndicatorPosition();
}
if (mShouldShowScrollIndicator) {
showScrollingIndicator(mShouldShowScrollIndicatorImmediately);
}
}
private void updateScrollingIndicatorPosition() {
if (!isScrollingIndicatorEnabled()) return;
if (mScrollIndicator == null) return;
int numPages = getChildCount();
int pageWidth = getViewportWidth();
int lastChildIndex = Math.max(0, getChildCount() - 1);
int maxScrollX = getChildOffset(lastChildIndex) - getRelativeChildOffset(lastChildIndex);
int trackWidth = pageWidth - mScrollIndicatorPaddingLeft - mScrollIndicatorPaddingRight;
int indicatorWidth = mScrollIndicator.getMeasuredWidth() -
mScrollIndicator.getPaddingLeft() - mScrollIndicator.getPaddingRight();
float offset = Math.max(0f, Math.min(1f, (float) getScrollX() / maxScrollX));
int indicatorSpace = trackWidth / numPages;
int indicatorPos = (int) (offset * (trackWidth - indicatorSpace)) + mScrollIndicatorPaddingLeft;
if (hasElasticScrollIndicator()) {
if (mScrollIndicator.getMeasuredWidth() != indicatorSpace) {
mScrollIndicator.getLayoutParams().width = indicatorSpace;
mScrollIndicator.requestLayout();
}
} else {
int indicatorCenterOffset = indicatorSpace / 2 - indicatorWidth / 2;
indicatorPos += indicatorCenterOffset;
}
mScrollIndicator.setTranslationX(indicatorPos);
}
// Animate the drag view back to the original position
void animateDragViewToOriginalPosition() {
if (mDragView != null) {
AnimatorSet anim = new AnimatorSet();
anim.setDuration(REORDERING_DROP_REPOSITION_DURATION);
anim.playTogether(
ObjectAnimator.ofFloat(mDragView, "translationX", 0f),
ObjectAnimator.ofFloat(mDragView, "translationY", 0f));
anim.addListener(new AnimatorListenerAdapter() {
@Override
public void onAnimationEnd(Animator animation) {
onPostReorderingAnimationCompleted();
}
});
anim.start();
}
}
// "Zooms out" the PagedView to reveal more side pages
protected boolean zoomOut() {
if (mZoomInOutAnim != null && mZoomInOutAnim.isRunning()) {
mZoomInOutAnim.cancel();
}
if (!(getScaleX() < 1f || getScaleY() < 1f)) {
mZoomInOutAnim = new AnimatorSet();
mZoomInOutAnim.setDuration(REORDERING_ZOOM_IN_OUT_DURATION);
mZoomInOutAnim.playTogether(
ObjectAnimator.ofFloat(this, "scaleX", mMinScale),
ObjectAnimator.ofFloat(this, "scaleY", mMinScale));
mZoomInOutAnim.addListener(new AnimatorListenerAdapter() {
@Override
public void onAnimationStart(Animator animation) {
// Show the delete drop target
if (mDeleteDropTarget != null) {
mDeleteDropTarget.setVisibility(View.VISIBLE);
mDeleteDropTarget.animate().alpha(1f)
.setDuration(REORDERING_DELETE_DROP_TARGET_FADE_DURATION)
.setListener(new AnimatorListenerAdapter() {
@Override
public void onAnimationStart(Animator animation) {
mDeleteDropTarget.setAlpha(0f);
}
});
}
}
});
mZoomInOutAnim.start();
return true;
}
return false;
}
protected void onStartReordering() {
if (AccessibilityManager.getInstance(mContext).isEnabled()) {
announceForAccessibility(mContext.getString(
R.string.keyguard_accessibility_widget_reorder_start));
}
// Set the touch state to reordering (allows snapping to pages, dragging a child, etc.)
setTouchState(TOUCH_STATE_REORDERING);
mIsReordering = true;
// Mark all the non-widget pages as invisible
getVisiblePages(mTempVisiblePagesRange);
boundByReorderablePages(true, mTempVisiblePagesRange);
for (int i = 0; i < getPageCount(); ++i) {
if (i < mTempVisiblePagesRange[0] || i > mTempVisiblePagesRange[1]) {
getPageAt(i).setAlpha(0f);
}
}
// We must invalidate to trigger a redraw to update the layers such that the drag view
// is always drawn on top
invalidate();
}
private void onPostReorderingAnimationCompleted() {
// Trigger the callback when reordering has settled
--mPostReorderingPreZoomInRemainingAnimationCount;
if (mPostReorderingPreZoomInRunnable != null &&
mPostReorderingPreZoomInRemainingAnimationCount == 0) {
mPostReorderingPreZoomInRunnable.run();
mPostReorderingPreZoomInRunnable = null;
}
}
protected void onEndReordering() {
if (AccessibilityManager.getInstance(mContext).isEnabled()) {
if (mDeleteString != null) {
announceForAccessibility(mDeleteString);
mDeleteString = null;
} else {
announceForAccessibility(mContext.getString(
R.string.keyguard_accessibility_widget_reorder_end));
}
}
mIsReordering = false;
// Mark all the non-widget pages as visible again
getVisiblePages(mTempVisiblePagesRange);
boundByReorderablePages(true, mTempVisiblePagesRange);
for (int i = 0; i < getPageCount(); ++i) {
if (i < mTempVisiblePagesRange[0] || i > mTempVisiblePagesRange[1]) {
getPageAt(i).setAlpha(1f);
}
}
}
public boolean startReordering() {
int dragViewIndex = getPageNearestToCenterOfScreen();
mTempVisiblePagesRange[0] = 0;
mTempVisiblePagesRange[1] = getPageCount() - 1;
boundByReorderablePages(true, mTempVisiblePagesRange);
// Check if we are within the reordering range
if (mTempVisiblePagesRange[0] <= dragViewIndex &&
dragViewIndex <= mTempVisiblePagesRange[1]) {
mReorderingStarted = true;
if (zoomOut()) {
// Find the drag view under the pointer
mDragView = getChildAt(dragViewIndex);
onStartReordering();
}
return true;
}
return false;
}
boolean isReordering(boolean testTouchState) {
boolean state = mIsReordering;
if (testTouchState) {
state &= (mTouchState == TOUCH_STATE_REORDERING);
}
return state;
}
void endReordering() {
// For simplicity, we call endReordering sometimes even if reordering was never started.
// In that case, we don't want to do anything.
if (!mReorderingStarted) return;
mReorderingStarted = false;
// If we haven't flung-to-delete the current child, then we just animate the drag view
// back into position
final Runnable onCompleteRunnable = new Runnable() {
@Override
public void run() {
onEndReordering();
}
};
if (!mDeferringForDelete) {
mPostReorderingPreZoomInRunnable = new Runnable() {
public void run() {
zoomIn(onCompleteRunnable);
};
};
mPostReorderingPreZoomInRemainingAnimationCount =
NUM_ANIMATIONS_RUNNING_BEFORE_ZOOM_OUT;
// Snap to the current page
snapToPage(indexOfChild(mDragView), 0);
// Animate the drag view back to the front position
animateDragViewToOriginalPosition();
} else {
// Handled in post-delete-animation-callbacks
}
}
// "Zooms in" the PagedView to highlight the current page
protected boolean zoomIn(final Runnable onCompleteRunnable) {
if (mZoomInOutAnim != null && mZoomInOutAnim.isRunning()) {
mZoomInOutAnim.cancel();
}
if (getScaleX() < 1f || getScaleY() < 1f) {
mZoomInOutAnim = new AnimatorSet();
mZoomInOutAnim.setDuration(REORDERING_ZOOM_IN_OUT_DURATION);
mZoomInOutAnim.playTogether(
ObjectAnimator.ofFloat(this, "scaleX", 1f),
ObjectAnimator.ofFloat(this, "scaleY", 1f));
mZoomInOutAnim.addListener(new AnimatorListenerAdapter() {
@Override
public void onAnimationStart(Animator animation) {
// Hide the delete drop target
if (mDeleteDropTarget != null) {
mDeleteDropTarget.animate().alpha(0f)
.setDuration(REORDERING_DELETE_DROP_TARGET_FADE_DURATION)
.setListener(new AnimatorListenerAdapter() {
@Override
public void onAnimationEnd(Animator animation) {
mDeleteDropTarget.setVisibility(View.GONE);
}
});
}
}
@Override
public void onAnimationCancel(Animator animation) {
mDragView = null;
}
@Override
public void onAnimationEnd(Animator animation) {
mDragView = null;
if (onCompleteRunnable != null) {
onCompleteRunnable.run();
}
}
});
mZoomInOutAnim.start();
return true;
} else {
if (onCompleteRunnable != null) {
onCompleteRunnable.run();
}
}
return false;
}
/*
* Flinging to delete - IN PROGRESS
*/
private PointF isFlingingToDelete() {
ViewConfiguration config = ViewConfiguration.get(getContext());
mVelocityTracker.computeCurrentVelocity(1000, config.getScaledMaximumFlingVelocity());
if (mVelocityTracker.getYVelocity() < mFlingToDeleteThresholdVelocity) {
// Do a quick dot product test to ensure that we are flinging upwards
PointF vel = new PointF(mVelocityTracker.getXVelocity(),
mVelocityTracker.getYVelocity());
PointF upVec = new PointF(0f, -1f);
float theta = (float) Math.acos(((vel.x * upVec.x) + (vel.y * upVec.y)) /
(vel.length() * upVec.length()));
if (theta <= Math.toRadians(FLING_TO_DELETE_MAX_FLING_DEGREES)) {
return vel;
}
}
return null;
}
/**
* Creates an animation from the current drag view along its current velocity vector.
* For this animation, the alpha runs for a fixed duration and we update the position
* progressively.
*/
private static class FlingAlongVectorAnimatorUpdateListener implements AnimatorUpdateListener {
private View mDragView;
private PointF mVelocity;
private Rect mFrom;
private long mPrevTime;
private float mFriction;
private final TimeInterpolator mAlphaInterpolator = new DecelerateInterpolator(0.75f);
public FlingAlongVectorAnimatorUpdateListener(View dragView, PointF vel, Rect from,
long startTime, float friction) {
mDragView = dragView;
mVelocity = vel;
mFrom = from;
mPrevTime = startTime;
mFriction = 1f - (mDragView.getResources().getDisplayMetrics().density * friction);
}
@Override
public void onAnimationUpdate(ValueAnimator animation) {
float t = ((Float) animation.getAnimatedValue()).floatValue();
long curTime = AnimationUtils.currentAnimationTimeMillis();
mFrom.left += (mVelocity.x * (curTime - mPrevTime) / 1000f);
mFrom.top += (mVelocity.y * (curTime - mPrevTime) / 1000f);
mDragView.setTranslationX(mFrom.left);
mDragView.setTranslationY(mFrom.top);
mDragView.setAlpha(1f - mAlphaInterpolator.getInterpolation(t));
mVelocity.x *= mFriction;
mVelocity.y *= mFriction;
mPrevTime = curTime;
}
};
private Runnable createPostDeleteAnimationRunnable(final View dragView) {
return new Runnable() {
@Override
public void run() {
int dragViewIndex = indexOfChild(dragView);
// For each of the pages around the drag view, animate them from the previous
// position to the new position in the layout (as a result of the drag view moving
// in the layout)
// NOTE: We can make an assumption here because we have side-bound pages that we
// will always have pages to animate in from the left
getVisiblePages(mTempVisiblePagesRange);
boundByReorderablePages(true, mTempVisiblePagesRange);
boolean isLastWidgetPage = (mTempVisiblePagesRange[0] == mTempVisiblePagesRange[1]);
boolean slideFromLeft = (isLastWidgetPage ||
dragViewIndex > mTempVisiblePagesRange[0]);
// Setup the scroll to the correct page before we swap the views
if (slideFromLeft) {
snapToPageImmediately(dragViewIndex - 1);
}
int firstIndex = (isLastWidgetPage ? 0 : mTempVisiblePagesRange[0]);
int lastIndex = Math.min(mTempVisiblePagesRange[1], getPageCount() - 1);
int lowerIndex = (slideFromLeft ? firstIndex : dragViewIndex + 1 );
int upperIndex = (slideFromLeft ? dragViewIndex - 1 : lastIndex);
ArrayList<Animator> animations = new ArrayList<Animator>();
for (int i = lowerIndex; i <= upperIndex; ++i) {
View v = getChildAt(i);
// dragViewIndex < pageUnderPointIndex, so after we remove the
// drag view all subsequent views to pageUnderPointIndex will
// shift down.
int oldX = 0;
int newX = 0;
if (slideFromLeft) {
if (i == 0) {
// Simulate the page being offscreen with the page spacing
oldX = getViewportOffsetX() + getChildOffset(i) - getChildWidth(i)
- mPageSpacing;
} else {
oldX = getViewportOffsetX() + getChildOffset(i - 1);
}
newX = getViewportOffsetX() + getChildOffset(i);
} else {
oldX = getChildOffset(i) - getChildOffset(i - 1);
newX = 0;
}
// Animate the view translation from its old position to its new
// position
AnimatorSet anim = (AnimatorSet) v.getTag();
if (anim != null) {
anim.cancel();
}
// Note: Hacky, but we want to skip any optimizations to not draw completely
// hidden views
v.setAlpha(Math.max(v.getAlpha(), 0.01f));
v.setTranslationX(oldX - newX);
anim = new AnimatorSet();
anim.playTogether(
ObjectAnimator.ofFloat(v, "translationX", 0f),
ObjectAnimator.ofFloat(v, "alpha", 1f));
animations.add(anim);
v.setTag(anim);
}
AnimatorSet slideAnimations = new AnimatorSet();
slideAnimations.playTogether(animations);
slideAnimations.setDuration(DELETE_SLIDE_IN_SIDE_PAGE_DURATION);
slideAnimations.addListener(new AnimatorListenerAdapter() {
@Override
public void onAnimationEnd(Animator animation) {
final Runnable onCompleteRunnable = new Runnable() {
@Override
public void run() {
mDeferringForDelete = false;
onEndReordering();
onRemoveViewAnimationCompleted();
}
};
zoomIn(onCompleteRunnable);
}
});
slideAnimations.start();
removeView(dragView);
onRemoveView(dragView, true);
}
};
}
public void onFlingToDelete(PointF vel) {
final long startTime = AnimationUtils.currentAnimationTimeMillis();
// NOTE: Because it takes time for the first frame of animation to actually be
// called and we expect the animation to be a continuation of the fling, we have
// to account for the time that has elapsed since the fling finished. And since
// we don't have a startDelay, we will always get call to update when we call
// start() (which we want to ignore).
final TimeInterpolator tInterpolator = new TimeInterpolator() {
private int mCount = -1;
private long mStartTime;
private float mOffset;
/* Anonymous inner class ctor */ {
mStartTime = startTime;
}
@Override
public float getInterpolation(float t) {
if (mCount < 0) {
mCount++;
} else if (mCount == 0) {
mOffset = Math.min(0.5f, (float) (AnimationUtils.currentAnimationTimeMillis() -
mStartTime) / FLING_TO_DELETE_FADE_OUT_DURATION);
mCount++;
}
return Math.min(1f, mOffset + t);
}
};
final Rect from = new Rect();
final View dragView = mDragView;
from.left = (int) dragView.getTranslationX();
from.top = (int) dragView.getTranslationY();
AnimatorUpdateListener updateCb = new FlingAlongVectorAnimatorUpdateListener(dragView, vel,
from, startTime, FLING_TO_DELETE_FRICTION);
mDeleteString = getContext().getResources()
.getString(R.string.keyguard_accessibility_widget_deleted,
mDragView.getContentDescription());
final Runnable onAnimationEndRunnable = createPostDeleteAnimationRunnable(dragView);
// Create and start the animation
ValueAnimator mDropAnim = new ValueAnimator();
mDropAnim.setInterpolator(tInterpolator);
mDropAnim.setDuration(FLING_TO_DELETE_FADE_OUT_DURATION);
mDropAnim.setFloatValues(0f, 1f);
mDropAnim.addUpdateListener(updateCb);
mDropAnim.addListener(new AnimatorListenerAdapter() {
public void onAnimationEnd(Animator animation) {
onAnimationEndRunnable.run();
}
});
mDropAnim.start();
mDeferringForDelete = true;
}
/* Drag to delete */
private boolean isHoveringOverDeleteDropTarget(int x, int y) {
if (mDeleteDropTarget != null) {
mAltTmpRect.set(0, 0, 0, 0);
View parent = (View) mDeleteDropTarget.getParent();
if (parent != null) {
parent.getGlobalVisibleRect(mAltTmpRect);
}
mDeleteDropTarget.getGlobalVisibleRect(mTmpRect);
mTmpRect.offset(-mAltTmpRect.left, -mAltTmpRect.top);
return mTmpRect.contains(x, y);
}
return false;
}
protected void setPageHoveringOverDeleteDropTarget(int viewIndex, boolean isHovering) {}
private void onDropToDelete() {
final View dragView = mDragView;
final float toScale = 0f;
final float toAlpha = 0f;
// Create and start the complex animation
ArrayList<Animator> animations = new ArrayList<Animator>();
AnimatorSet motionAnim = new AnimatorSet();
motionAnim.setInterpolator(new DecelerateInterpolator(2));
motionAnim.playTogether(
ObjectAnimator.ofFloat(dragView, "scaleX", toScale),
ObjectAnimator.ofFloat(dragView, "scaleY", toScale));
animations.add(motionAnim);
AnimatorSet alphaAnim = new AnimatorSet();
alphaAnim.setInterpolator(new LinearInterpolator());
alphaAnim.playTogether(
ObjectAnimator.ofFloat(dragView, "alpha", toAlpha));
animations.add(alphaAnim);
mDeleteString = getContext().getResources()
.getString(R.string.keyguard_accessibility_widget_deleted,
mDragView.getContentDescription());
final Runnable onAnimationEndRunnable = createPostDeleteAnimationRunnable(dragView);
AnimatorSet anim = new AnimatorSet();
anim.playTogether(animations);
anim.setDuration(DRAG_TO_DELETE_FADE_OUT_DURATION);
anim.addListener(new AnimatorListenerAdapter() {
public void onAnimationEnd(Animator animation) {
onAnimationEndRunnable.run();
}
});
anim.start();
mDeferringForDelete = true;
}
/* Accessibility */
@Override
public void onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo info) {
super.onInitializeAccessibilityNodeInfo(info);
info.setScrollable(getPageCount() > 1);
if (getCurrentPage() < getPageCount() - 1) {
info.addAction(AccessibilityNodeInfo.ACTION_SCROLL_FORWARD);
}
if (getCurrentPage() > 0) {
info.addAction(AccessibilityNodeInfo.ACTION_SCROLL_BACKWARD);
}
}
@Override
public void onInitializeAccessibilityEvent(AccessibilityEvent event) {
super.onInitializeAccessibilityEvent(event);
event.setScrollable(true);
if (event.getEventType() == AccessibilityEvent.TYPE_VIEW_SCROLLED) {
event.setFromIndex(mCurrentPage);
event.setToIndex(mCurrentPage);
event.setItemCount(getChildCount());
}
}
@Override
public boolean performAccessibilityAction(int action, Bundle arguments) {
if (super.performAccessibilityAction(action, arguments)) {
return true;
}
switch (action) {
case AccessibilityNodeInfo.ACTION_SCROLL_FORWARD: {
if (getCurrentPage() < getPageCount() - 1) {
scrollRight();
return true;
}
} break;
case AccessibilityNodeInfo.ACTION_SCROLL_BACKWARD: {
if (getCurrentPage() > 0) {
scrollLeft();
return true;
}
} break;
}
return false;
}
@Override
public boolean onHoverEvent(android.view.MotionEvent event) {
return true;
}
void beginCameraEvent() {
mIsCameraEvent = true;
}
void endCameraEvent() {
mIsCameraEvent = false;
}
AnimatorListenerAdapter mOnScreenAnimationListener = new AnimatorListenerAdapter() {
@Override
public void onAnimationEnd(Animator animation) {
mWarpAnimation = null;
if (mTouchState != TOUCH_STATE_SCROLLING && mTouchState != TOUCH_STATE_READY) {
animateWarpPageOffScreen("onScreen end", true);
}
}
@Override
public void onAnimationCancel(Animator animation) {
super.onAnimationCancel(animation);
mWarpAnimation = null;
}
};
AnimatorListenerAdapter mOffScreenAnimationListener = new AnimatorListenerAdapter() {
@Override
public void onAnimationEnd(Animator animation) {
mWarpAnimation = null;
mWarpPageExposed = false;
KeyguardWidgetFrame v = (KeyguardWidgetFrame) getPageAt(getPageWarpIndex());
v.setTranslationX(0.0f);
}
@Override
public void onAnimationCancel(Animator animation) {
super.onAnimationCancel(animation);
mWarpAnimation = null;
}
};
private void cancelWarpAnimation(String msg, boolean abortAnimation) {
if (DEBUG_WARP) Log.v(TAG, "cancelWarpAnimation(" + msg + ",abort=" + abortAnimation + ")");
if (abortAnimation) {
// We're done with the animation and moving to a new page. Let the scroller
// take over the animation.
KeyguardWidgetFrame v = (KeyguardWidgetFrame) getPageAt(getPageWarpIndex());
v.animate().cancel();
// Make the scroll amount match the current warp position.
scrollBy(Math.round(-v.getTranslationX()), 0);
v.setTranslationX(0);
} else {
animateWarpPageOffScreen("canceled", true);
}
}
private boolean isAnimatingWarpPage() {
return mWarpAnimation != null;
}
private void animateWarpPageOnScreen(String reason) {
if (DEBUG_WARP) Log.v(TAG, "animateWarpPageOnScreen(" + reason + ")");
if (!mWarpPageExposed) {
mWarpPageExposed = true;
dispatchOnPageBeginWarp();
KeyguardWidgetFrame v = (KeyguardWidgetFrame) getPageAt(getPageWarpIndex());
if (DEBUG_WARP) Log.v(TAG, "moving page on screen: Tx=" + v.getTranslationX());
DecelerateInterpolator interp = new DecelerateInterpolator(1.5f);
int totalOffset = getCurrentWarpOffset();
v.setTranslationX(totalOffset);
mWarpAnimation = v.animate();
mWarpAnimation.translationX(mWarpPeekAmount+totalOffset)
.setInterpolator(interp)
.setDuration(WARP_PEEK_ANIMATION_DURATION)
.setListener(mOnScreenAnimationListener);
}
}
private int getCurrentWarpOffset() {
if (mCurrentPage == getPageWarpIndex()) {
return 0;
}
View viewRight = getPageAt(mCurrentPage + 1);
View warpView = getPageAt(getPageWarpIndex());
if (viewRight != warpView && viewRight != null && warpView != null) {
return viewRight.getLeft() - warpView.getLeft();
}
return 0;
}
private void animateWarpPageOffScreen(String reason, boolean animate) {
if (DEBUG_WARP) Log.v(TAG, "animateWarpPageOffScreen(" + reason + " anim:" + animate + ")");
if (mWarpPageExposed) {
dispatchOnPageEndWarp();
KeyguardWidgetFrame v = (KeyguardWidgetFrame) getPageAt(getPageWarpIndex());
if (DEBUG_WARP) Log.v(TAG, "moving page off screen: Tx=" + v.getTranslationX());
AccelerateInterpolator interp = new AccelerateInterpolator(1.5f);
int totalOffset = getCurrentWarpOffset();
v.animate().translationX(totalOffset)
.setInterpolator(interp)
.setDuration(animate ? WARP_PEEK_ANIMATION_DURATION : 0)
.setListener(mOffScreenAnimationListener);
} else {
if (DEBUG_WARP) Log.e(TAG, "animateWarpPageOffScreen(): not warping", new Exception());
}
}
/**
* Swaps the position of the views by setting the left and right edges appropriately.
*/
void swapPages(int indexA, int indexB) {
View viewA = getPageAt(indexA);
View viewB = getPageAt(indexB);
if (viewA != viewB && viewA != null && viewB != null) {
int deltaX = viewA.getLeft() - viewB.getLeft();
viewA.offsetLeftAndRight(-deltaX);
viewB.offsetLeftAndRight(deltaX);
}
}
public void startPageWarp(int pageIndex) {
if (DEBUG_WARP) Log.v(TAG, "START WARP");
if (pageIndex != mCurrentPage + 1) {
mPageSwapIndex = mCurrentPage + 1;
}
mPageWarpIndex = pageIndex;
}
protected int getPageWarpIndex() {
return getPageCount() - 1;
}
public void stopPageWarp() {
if (DEBUG_WARP) Log.v(TAG, "END WARP");
// mPageSwapIndex is reset in snapToPage() after the scroll animation completes
}
public void onPageBeginWarp() {
}
public void onPageEndWarp() {
}
}
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