| /* |
| * Copyright (C) 2010 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 android.widget; |
| |
| import android.animation.PropertyValuesHolder; |
| import android.animation.ObjectAnimator; |
| import android.content.Context; |
| import android.content.res.Resources; |
| import android.graphics.Bitmap; |
| import android.graphics.BlurMaskFilter; |
| import android.graphics.Canvas; |
| import android.graphics.Matrix; |
| import android.graphics.Paint; |
| import android.graphics.PorterDuff; |
| import android.graphics.PorterDuffXfermode; |
| import android.graphics.Rect; |
| import android.graphics.RectF; |
| import android.graphics.TableMaskFilter; |
| import android.util.AttributeSet; |
| import android.util.DisplayMetrics; |
| import android.util.Log; |
| import android.view.MotionEvent; |
| import android.view.VelocityTracker; |
| import android.view.View; |
| import android.view.ViewConfiguration; |
| import android.view.ViewGroup; |
| import android.view.View.MeasureSpec; |
| import android.view.ViewGroup.LayoutParams; |
| import android.view.animation.LinearInterpolator; |
| import android.widget.RemoteViews.RemoteView; |
| |
| @RemoteView |
| /** |
| * A view that displays its children in a stack and allows users to discretely swipe |
| * through the children. |
| */ |
| public class StackView extends AdapterViewAnimator { |
| private final String TAG = "StackView"; |
| |
| /** |
| * Default animation parameters |
| */ |
| private final int DEFAULT_ANIMATION_DURATION = 400; |
| private final int MINIMUM_ANIMATION_DURATION = 50; |
| |
| /** |
| * Parameters effecting the perspective visuals |
| */ |
| private static float PERSPECTIVE_SHIFT_FACTOR = 0.12f; |
| private static float PERSPECTIVE_SCALE_FACTOR = 0.35f; |
| |
| /** |
| * Represent the two possible stack modes, one where items slide up, and the other |
| * where items slide down. The perspective is also inverted between these two modes. |
| */ |
| private static final int ITEMS_SLIDE_UP = 0; |
| private static final int ITEMS_SLIDE_DOWN = 1; |
| |
| /** |
| * These specify the different gesture states |
| */ |
| private static final int GESTURE_NONE = 0; |
| private static final int GESTURE_SLIDE_UP = 1; |
| private static final int GESTURE_SLIDE_DOWN = 2; |
| |
| /** |
| * Specifies how far you need to swipe (up or down) before it |
| * will be consider a completed gesture when you lift your finger |
| */ |
| private static final float SWIPE_THRESHOLD_RATIO = 0.35f; |
| private static final float SLIDE_UP_RATIO = 0.7f; |
| |
| /** |
| * Sentinel value for no current active pointer. |
| * Used by {@link #mActivePointerId}. |
| */ |
| private static final int INVALID_POINTER = -1; |
| |
| /** |
| * Number of active views in the stack. One fewer view is actually visible, as one is hidden. |
| */ |
| private static final int NUM_ACTIVE_VIEWS = 5; |
| |
| private static final int FRAME_PADDING = 4; |
| |
| /** |
| * These variables are all related to the current state of touch interaction |
| * with the stack |
| */ |
| private float mInitialY; |
| private float mInitialX; |
| private int mActivePointerId; |
| private int mYVelocity = 0; |
| private int mSwipeGestureType = GESTURE_NONE; |
| private int mSlideAmount; |
| private int mSwipeThreshold; |
| private int mTouchSlop; |
| private int mMaximumVelocity; |
| private VelocityTracker mVelocityTracker; |
| |
| private static HolographicHelper sHolographicHelper; |
| private ImageView mHighlight; |
| private StackSlider mStackSlider; |
| private boolean mFirstLayoutHappened = false; |
| private ViewGroup mAncestorContainingAllChildren = null; |
| private int mAncestorHeight = 0; |
| private int mStackMode; |
| private int mFramePadding; |
| |
| public StackView(Context context) { |
| super(context); |
| initStackView(); |
| } |
| |
| public StackView(Context context, AttributeSet attrs) { |
| super(context, attrs); |
| initStackView(); |
| } |
| |
| private void initStackView() { |
| configureViewAnimator(NUM_ACTIVE_VIEWS, NUM_ACTIVE_VIEWS - 2); |
| setStaticTransformationsEnabled(true); |
| final ViewConfiguration configuration = ViewConfiguration.get(getContext()); |
| mTouchSlop = configuration.getScaledTouchSlop(); |
| mMaximumVelocity = configuration.getScaledMaximumFlingVelocity(); |
| mActivePointerId = INVALID_POINTER; |
| |
| mHighlight = new ImageView(getContext()); |
| mHighlight.setLayoutParams(new LayoutParams(mHighlight)); |
| addViewInLayout(mHighlight, -1, new LayoutParams(mHighlight)); |
| mStackSlider = new StackSlider(); |
| |
| if (sHolographicHelper == null) { |
| sHolographicHelper = new HolographicHelper(mContext); |
| } |
| setClipChildren(false); |
| setClipToPadding(false); |
| |
| // This sets the form of the StackView, which is currently to have the perspective-shifted |
| // views above the active view, and have items slide down when sliding out. The opposite is |
| // available by using ITEMS_SLIDE_UP. |
| mStackMode = ITEMS_SLIDE_DOWN; |
| |
| // This is a flag to indicate the the stack is loading for the first time |
| mWhichChild = -1; |
| |
| // Adjust the frame padding based on the density, since the highlight changes based |
| // on the density |
| final float density = mContext.getResources().getDisplayMetrics().density; |
| mFramePadding = (int) Math.ceil(density * FRAME_PADDING); |
| } |
| |
| /** |
| * Animate the views between different relative indexes within the {@link AdapterViewAnimator} |
| */ |
| void animateViewForTransition(int fromIndex, int toIndex, View view) { |
| if (fromIndex == -1 && toIndex == 0) { |
| // Fade item in |
| if (view.getAlpha() == 1) { |
| view.setAlpha(0); |
| } |
| view.setVisibility(VISIBLE); |
| |
| ObjectAnimator<Float> fadeIn = new ObjectAnimator<Float>(DEFAULT_ANIMATION_DURATION, |
| view, "alpha", view.getAlpha(), 1.0f); |
| fadeIn.start(); |
| } else if (fromIndex == mNumActiveViews - 1 && toIndex == mNumActiveViews - 2) { |
| // Slide item in |
| view.setVisibility(VISIBLE); |
| |
| LayoutParams lp = (LayoutParams) view.getLayoutParams(); |
| int duration = Math.round(mStackSlider.getDurationForNeutralPosition(mYVelocity)); |
| |
| StackSlider animationSlider = new StackSlider(mStackSlider); |
| PropertyValuesHolder<Float> slideInY = |
| new PropertyValuesHolder<Float>("YProgress", 0.0f); |
| PropertyValuesHolder<Float> slideInX = |
| new PropertyValuesHolder<Float>("XProgress", 0.0f); |
| ObjectAnimator pa = new ObjectAnimator(duration, animationSlider, |
| slideInX, slideInY); |
| pa.setInterpolator(new LinearInterpolator()); |
| pa.start(); |
| } else if (fromIndex == mNumActiveViews - 2 && toIndex == mNumActiveViews - 1) { |
| // Slide item out |
| LayoutParams lp = (LayoutParams) view.getLayoutParams(); |
| |
| int duration = Math.round(mStackSlider.getDurationForOffscreenPosition(mYVelocity)); |
| |
| StackSlider animationSlider = new StackSlider(mStackSlider); |
| PropertyValuesHolder<Float> slideOutY = |
| new PropertyValuesHolder<Float>("YProgress", 1.0f); |
| PropertyValuesHolder<Float> slideOutX = |
| new PropertyValuesHolder<Float>("XProgress", 0.0f); |
| ObjectAnimator pa = new ObjectAnimator(duration, animationSlider, |
| slideOutX, slideOutY); |
| pa.setInterpolator(new LinearInterpolator()); |
| pa.start(); |
| } else if (fromIndex == -1 && toIndex == mNumActiveViews - 1) { |
| // Make sure this view that is "waiting in the wings" is invisible |
| view.setAlpha(0.0f); |
| view.setVisibility(INVISIBLE); |
| LayoutParams lp = (LayoutParams) view.getLayoutParams(); |
| lp.setVerticalOffset(-mSlideAmount); |
| } else if (toIndex == -1) { |
| // Fade item out |
| ObjectAnimator<Float> fadeOut = new ObjectAnimator<Float> |
| (DEFAULT_ANIMATION_DURATION, view, "alpha", view.getAlpha(), 0.0f); |
| fadeOut.start(); |
| } |
| |
| // Implement the faked perspective |
| if (toIndex != -1) { |
| transformViewAtIndex(toIndex, view); |
| } |
| } |
| |
| private void transformViewAtIndex(int index, View view) { |
| float maxPerpectiveShift = mMeasuredHeight * PERSPECTIVE_SHIFT_FACTOR; |
| |
| if (index == mNumActiveViews -1) index--; |
| |
| float r = (index * 1.0f) / (mNumActiveViews - 2); |
| |
| float scale = 1 - PERSPECTIVE_SCALE_FACTOR * (1 - r); |
| PropertyValuesHolder<Float> scaleX = new PropertyValuesHolder<Float>("scaleX", scale); |
| PropertyValuesHolder<Float> scaleY = new PropertyValuesHolder<Float>("scaleY", scale); |
| |
| r = (float) Math.pow(r, 2); |
| |
| int stackDirection = (mStackMode == ITEMS_SLIDE_UP) ? 1 : -1; |
| float perspectiveTranslation = -stackDirection * r * maxPerpectiveShift; |
| float scaleShiftCorrection = stackDirection * (1 - scale) * |
| (mMeasuredHeight * (1 - PERSPECTIVE_SHIFT_FACTOR) / 2.0f); |
| float transY = perspectiveTranslation + scaleShiftCorrection; |
| |
| PropertyValuesHolder<Float> translationY = |
| new PropertyValuesHolder<Float>("translationY", transY); |
| ObjectAnimator pa = new ObjectAnimator(100, view, scaleX, scaleY, translationY); |
| pa.start(); |
| } |
| |
| private void updateChildTransforms() { |
| for (int i = 0; i < mNumActiveViews - 1; i++) { |
| View v = getViewAtRelativeIndex(i); |
| if (v != null) { |
| transformViewAtIndex(i, v); |
| } |
| } |
| } |
| |
| @Override |
| FrameLayout getFrameForChild() { |
| FrameLayout fl = new FrameLayout(mContext); |
| fl.setPadding(mFramePadding, mFramePadding, mFramePadding, mFramePadding); |
| return fl; |
| } |
| |
| /** |
| * Apply any necessary tranforms for the child that is being added. |
| */ |
| void applyTransformForChildAtIndex(View child, int relativeIndex) { |
| } |
| |
| @Override |
| protected void dispatchDraw(Canvas canvas) { |
| super.dispatchDraw(canvas); |
| } |
| |
| // TODO: right now, this code walks up the hierarchy as far as needed and disables clipping |
| // so that the stack's children can draw outside of the stack's bounds. This is fine within |
| // the context of widgets in the launcher, but is destructive in general, as the clipping |
| // values are not being reset. For this to be a full framework level widget, we will need |
| // framework level support for drawing outside of a parent's bounds. |
| private void disableParentalClipping() { |
| if (mAncestorContainingAllChildren != null) { |
| ViewGroup vg = this; |
| while (vg.getParent() != null && vg.getParent() instanceof ViewGroup) { |
| if (vg == mAncestorContainingAllChildren) break; |
| vg = (ViewGroup) vg.getParent(); |
| vg.setClipChildren(false); |
| vg.setClipToPadding(false); |
| } |
| } |
| } |
| |
| private void onLayout() { |
| if (!mFirstLayoutHappened) { |
| mSlideAmount = Math.round(SLIDE_UP_RATIO * getMeasuredHeight()); |
| updateChildTransforms(); |
| mSwipeThreshold = Math.round(SWIPE_THRESHOLD_RATIO * mSlideAmount); |
| mFirstLayoutHappened = true; |
| } |
| } |
| |
| @Override |
| public boolean onInterceptTouchEvent(MotionEvent ev) { |
| int action = ev.getAction(); |
| switch(action & MotionEvent.ACTION_MASK) { |
| case MotionEvent.ACTION_DOWN: { |
| if (mActivePointerId == INVALID_POINTER) { |
| mInitialX = ev.getX(); |
| mInitialY = ev.getY(); |
| mActivePointerId = ev.getPointerId(0); |
| } |
| break; |
| } |
| case MotionEvent.ACTION_MOVE: { |
| int pointerIndex = ev.findPointerIndex(mActivePointerId); |
| if (pointerIndex == INVALID_POINTER) { |
| // no data for our primary pointer, this shouldn't happen, log it |
| Log.d(TAG, "Error: No data for our primary pointer."); |
| return false; |
| } |
| float newY = ev.getY(pointerIndex); |
| float deltaY = newY - mInitialY; |
| |
| beginGestureIfNeeded(deltaY); |
| break; |
| } |
| case MotionEvent.ACTION_POINTER_UP: { |
| onSecondaryPointerUp(ev); |
| break; |
| } |
| case MotionEvent.ACTION_UP: |
| case MotionEvent.ACTION_CANCEL: { |
| mActivePointerId = INVALID_POINTER; |
| mSwipeGestureType = GESTURE_NONE; |
| } |
| } |
| |
| return mSwipeGestureType != GESTURE_NONE; |
| } |
| |
| private void beginGestureIfNeeded(float deltaY) { |
| if ((int) Math.abs(deltaY) > mTouchSlop && mSwipeGestureType == GESTURE_NONE) { |
| int swipeGestureType = deltaY < 0 ? GESTURE_SLIDE_UP : GESTURE_SLIDE_DOWN; |
| cancelLongPress(); |
| requestDisallowInterceptTouchEvent(true); |
| |
| int activeIndex; |
| if (mStackMode == ITEMS_SLIDE_UP) { |
| activeIndex = (swipeGestureType == GESTURE_SLIDE_DOWN) ? |
| mNumActiveViews - 1 : mNumActiveViews - 2; |
| } else { |
| activeIndex = (swipeGestureType == GESTURE_SLIDE_DOWN) ? |
| mNumActiveViews - 2 : mNumActiveViews - 1; |
| } |
| |
| if (mAdapter == null) return; |
| |
| if (mLoopViews) { |
| mStackSlider.setMode(StackSlider.NORMAL_MODE); |
| } else if (mCurrentWindowStartUnbounded + activeIndex == 0) { |
| mStackSlider.setMode(StackSlider.BEGINNING_OF_STACK_MODE); |
| } else if (mCurrentWindowStartUnbounded + activeIndex == mAdapter.getCount()) { |
| activeIndex--; |
| mStackSlider.setMode(StackSlider.END_OF_STACK_MODE); |
| } else { |
| mStackSlider.setMode(StackSlider.NORMAL_MODE); |
| } |
| |
| View v = getViewAtRelativeIndex(activeIndex); |
| if (v == null) return; |
| |
| mHighlight.setImageBitmap(sHolographicHelper.createOutline(v)); |
| mHighlight.setRotation(v.getRotation()); |
| mHighlight.setTranslationY(v.getTranslationY()); |
| mHighlight.bringToFront(); |
| v.bringToFront(); |
| mStackSlider.setView(v); |
| |
| if (swipeGestureType == GESTURE_SLIDE_DOWN) |
| v.setVisibility(VISIBLE); |
| |
| // We only register this gesture if we've made it this far without a problem |
| mSwipeGestureType = swipeGestureType; |
| } |
| } |
| |
| @Override |
| public boolean onTouchEvent(MotionEvent ev) { |
| int action = ev.getAction(); |
| int pointerIndex = ev.findPointerIndex(mActivePointerId); |
| if (pointerIndex == INVALID_POINTER) { |
| // no data for our primary pointer, this shouldn't happen, log it |
| Log.d(TAG, "Error: No data for our primary pointer."); |
| return false; |
| } |
| |
| float newY = ev.getY(pointerIndex); |
| float newX = ev.getX(pointerIndex); |
| float deltaY = newY - mInitialY; |
| float deltaX = newX - mInitialX; |
| if (mVelocityTracker == null) { |
| mVelocityTracker = VelocityTracker.obtain(); |
| } |
| mVelocityTracker.addMovement(ev); |
| |
| switch (action & MotionEvent.ACTION_MASK) { |
| case MotionEvent.ACTION_MOVE: { |
| beginGestureIfNeeded(deltaY); |
| |
| float rx = deltaX / (mSlideAmount * 1.0f); |
| if (mSwipeGestureType == GESTURE_SLIDE_DOWN) { |
| float r = (deltaY - mTouchSlop * 1.0f) / mSlideAmount * 1.0f; |
| if (mStackMode == ITEMS_SLIDE_DOWN) r = 1 - r; |
| mStackSlider.setYProgress(1 - r); |
| mStackSlider.setXProgress(rx); |
| return true; |
| } else if (mSwipeGestureType == GESTURE_SLIDE_UP) { |
| float r = -(deltaY + mTouchSlop * 1.0f) / mSlideAmount * 1.0f; |
| if (mStackMode == ITEMS_SLIDE_DOWN) r = 1 - r; |
| mStackSlider.setYProgress(r); |
| mStackSlider.setXProgress(rx); |
| return true; |
| } |
| break; |
| } |
| case MotionEvent.ACTION_UP: { |
| handlePointerUp(ev); |
| break; |
| } |
| case MotionEvent.ACTION_POINTER_UP: { |
| onSecondaryPointerUp(ev); |
| break; |
| } |
| case MotionEvent.ACTION_CANCEL: { |
| mActivePointerId = INVALID_POINTER; |
| mSwipeGestureType = GESTURE_NONE; |
| break; |
| } |
| } |
| return true; |
| } |
| |
| private final Rect touchRect = new Rect(); |
| private void onSecondaryPointerUp(MotionEvent ev) { |
| final int activePointerIndex = ev.getActionIndex(); |
| final int pointerId = ev.getPointerId(activePointerIndex); |
| if (pointerId == mActivePointerId) { |
| |
| int activeViewIndex = (mSwipeGestureType == GESTURE_SLIDE_DOWN) ? mNumActiveViews - 1 |
| : mNumActiveViews - 2; |
| |
| View v = getViewAtRelativeIndex(activeViewIndex); |
| if (v == null) return; |
| |
| // Our primary pointer has gone up -- let's see if we can find |
| // another pointer on the view. If so, then we should replace |
| // our primary pointer with this new pointer and adjust things |
| // so that the view doesn't jump |
| for (int index = 0; index < ev.getPointerCount(); index++) { |
| if (index != activePointerIndex) { |
| |
| float x = ev.getX(index); |
| float y = ev.getY(index); |
| |
| touchRect.set(v.getLeft(), v.getTop(), v.getRight(), v.getBottom()); |
| if (touchRect.contains(Math.round(x), Math.round(y))) { |
| float oldX = ev.getX(activePointerIndex); |
| float oldY = ev.getY(activePointerIndex); |
| |
| // adjust our frame of reference to avoid a jump |
| mInitialY += (y - oldY); |
| mInitialX += (x - oldX); |
| |
| mActivePointerId = ev.getPointerId(index); |
| if (mVelocityTracker != null) { |
| mVelocityTracker.clear(); |
| } |
| // ok, we're good, we found a new pointer which is touching the active view |
| return; |
| } |
| } |
| } |
| // if we made it this far, it means we didn't find a satisfactory new pointer :(, |
| // so end the gesture |
| handlePointerUp(ev); |
| } |
| } |
| |
| private void handlePointerUp(MotionEvent ev) { |
| int pointerIndex = ev.findPointerIndex(mActivePointerId); |
| float newY = ev.getY(pointerIndex); |
| int deltaY = (int) (newY - mInitialY); |
| |
| if (mVelocityTracker != null) { |
| mVelocityTracker.computeCurrentVelocity(1000, mMaximumVelocity); |
| mYVelocity = (int) mVelocityTracker.getYVelocity(mActivePointerId); |
| } |
| |
| if (mVelocityTracker != null) { |
| mVelocityTracker.recycle(); |
| mVelocityTracker = null; |
| } |
| |
| if (deltaY > mSwipeThreshold && mSwipeGestureType == GESTURE_SLIDE_DOWN |
| && mStackSlider.mMode == StackSlider.NORMAL_MODE) { |
| // Swipe threshold exceeded, swipe down |
| if (mStackMode == ITEMS_SLIDE_UP) { |
| showNext(); |
| } else { |
| showPrevious(); |
| } |
| mHighlight.bringToFront(); |
| } else if (deltaY < -mSwipeThreshold && mSwipeGestureType == GESTURE_SLIDE_UP |
| && mStackSlider.mMode == StackSlider.NORMAL_MODE) { |
| // Swipe threshold exceeded, swipe up |
| if (mStackMode == ITEMS_SLIDE_UP) { |
| showPrevious(); |
| } else { |
| showNext(); |
| } |
| |
| mHighlight.bringToFront(); |
| } else if (mSwipeGestureType == GESTURE_SLIDE_UP ) { |
| // Didn't swipe up far enough, snap back down |
| int duration; |
| float finalYProgress = (mStackMode == ITEMS_SLIDE_DOWN) ? 1 : 0; |
| if (mStackMode == ITEMS_SLIDE_UP || mStackSlider.mMode != StackSlider.NORMAL_MODE) { |
| duration = Math.round(mStackSlider.getDurationForNeutralPosition()); |
| } else { |
| duration = Math.round(mStackSlider.getDurationForOffscreenPosition()); |
| } |
| |
| StackSlider animationSlider = new StackSlider(mStackSlider); |
| PropertyValuesHolder<Float> snapBackY = |
| new PropertyValuesHolder<Float>("YProgress", finalYProgress); |
| PropertyValuesHolder<Float> snapBackX = |
| new PropertyValuesHolder<Float>("XProgress", 0.0f); |
| ObjectAnimator pa = new ObjectAnimator(duration, animationSlider, |
| snapBackX, snapBackY); |
| pa.setInterpolator(new LinearInterpolator()); |
| pa.start(); |
| } else if (mSwipeGestureType == GESTURE_SLIDE_DOWN) { |
| // Didn't swipe down far enough, snap back up |
| float finalYProgress = (mStackMode == ITEMS_SLIDE_DOWN) ? 0 : 1; |
| int duration; |
| if (mStackMode == ITEMS_SLIDE_DOWN || mStackSlider.mMode != StackSlider.NORMAL_MODE) { |
| duration = Math.round(mStackSlider.getDurationForNeutralPosition()); |
| } else { |
| duration = Math.round(mStackSlider.getDurationForOffscreenPosition()); |
| } |
| |
| StackSlider animationSlider = new StackSlider(mStackSlider); |
| PropertyValuesHolder<Float> snapBackY = |
| new PropertyValuesHolder<Float>("YProgress", finalYProgress); |
| PropertyValuesHolder<Float> snapBackX = |
| new PropertyValuesHolder<Float>("XProgress", 0.0f); |
| ObjectAnimator pa = new ObjectAnimator(duration, animationSlider, |
| snapBackX, snapBackY); |
| pa.start(); |
| } |
| |
| mActivePointerId = INVALID_POINTER; |
| mSwipeGestureType = GESTURE_NONE; |
| } |
| |
| private class StackSlider { |
| View mView; |
| float mYProgress; |
| float mXProgress; |
| |
| static final int NORMAL_MODE = 0; |
| static final int BEGINNING_OF_STACK_MODE = 1; |
| static final int END_OF_STACK_MODE = 2; |
| |
| int mMode = NORMAL_MODE; |
| |
| public StackSlider() { |
| } |
| |
| public StackSlider(StackSlider copy) { |
| mView = copy.mView; |
| mYProgress = copy.mYProgress; |
| mXProgress = copy.mXProgress; |
| mMode = copy.mMode; |
| } |
| |
| private float cubic(float r) { |
| return (float) (Math.pow(2 * r - 1, 3) + 1) / 2.0f; |
| } |
| |
| private float highlightAlphaInterpolator(float r) { |
| float pivot = 0.4f; |
| if (r < pivot) { |
| return 0.85f * cubic(r / pivot); |
| } else { |
| return 0.85f * cubic(1 - (r - pivot) / (1 - pivot)); |
| } |
| } |
| |
| private float viewAlphaInterpolator(float r) { |
| float pivot = 0.3f; |
| if (r > pivot) { |
| return (r - pivot) / (1 - pivot); |
| } else { |
| return 0; |
| } |
| } |
| |
| private float rotationInterpolator(float r) { |
| float pivot = 0.2f; |
| if (r < pivot) { |
| return 0; |
| } else { |
| return (r - pivot) / (1 - pivot); |
| } |
| } |
| |
| void setView(View v) { |
| mView = v; |
| } |
| |
| public void setYProgress(float r) { |
| // enforce r between 0 and 1 |
| r = Math.min(1.0f, r); |
| r = Math.max(0, r); |
| |
| mYProgress = r; |
| final LayoutParams viewLp = (LayoutParams) mView.getLayoutParams(); |
| final LayoutParams highlightLp = (LayoutParams) mHighlight.getLayoutParams(); |
| |
| int stackDirection = (mStackMode == ITEMS_SLIDE_UP) ? 1 : -1; |
| |
| switch (mMode) { |
| case NORMAL_MODE: |
| viewLp.setVerticalOffset(Math.round(-r * stackDirection * mSlideAmount)); |
| highlightLp.setVerticalOffset(Math.round(-r * stackDirection * mSlideAmount)); |
| mHighlight.setAlpha(highlightAlphaInterpolator(r)); |
| |
| float alpha = viewAlphaInterpolator(1 - r); |
| |
| // We make sure that views which can't be seen (have 0 alpha) are also invisible |
| // so that they don't interfere with click events. |
| if (mView.getAlpha() == 0 && alpha != 0 && mView.getVisibility() != VISIBLE) { |
| mView.setVisibility(VISIBLE); |
| } else if (alpha == 0 && mView.getAlpha() != 0 |
| && mView.getVisibility() == VISIBLE) { |
| mView.setVisibility(INVISIBLE); |
| } |
| |
| mView.setAlpha(alpha); |
| mView.setRotationX(stackDirection * 90.0f * rotationInterpolator(r)); |
| mHighlight.setRotationX(stackDirection * 90.0f * rotationInterpolator(r)); |
| break; |
| case BEGINNING_OF_STACK_MODE: |
| r = r * 0.2f; |
| viewLp.setVerticalOffset(Math.round(-stackDirection * r * mSlideAmount)); |
| highlightLp.setVerticalOffset(Math.round(-stackDirection * r * mSlideAmount)); |
| mHighlight.setAlpha(highlightAlphaInterpolator(r)); |
| break; |
| case END_OF_STACK_MODE: |
| r = (1-r) * 0.2f; |
| viewLp.setVerticalOffset(Math.round(stackDirection * r * mSlideAmount)); |
| highlightLp.setVerticalOffset(Math.round(stackDirection * r * mSlideAmount)); |
| mHighlight.setAlpha(highlightAlphaInterpolator(r)); |
| break; |
| } |
| } |
| |
| public void setXProgress(float r) { |
| // enforce r between 0 and 1 |
| r = Math.min(2.0f, r); |
| r = Math.max(-2.0f, r); |
| |
| mXProgress = r; |
| |
| final LayoutParams viewLp = (LayoutParams) mView.getLayoutParams(); |
| final LayoutParams highlightLp = (LayoutParams) mHighlight.getLayoutParams(); |
| |
| r *= 0.2f; |
| viewLp.setHorizontalOffset(Math.round(r * mSlideAmount)); |
| highlightLp.setHorizontalOffset(Math.round(r * mSlideAmount)); |
| } |
| |
| void setMode(int mode) { |
| mMode = mode; |
| } |
| |
| float getDurationForNeutralPosition() { |
| return getDuration(false, 0); |
| } |
| |
| float getDurationForOffscreenPosition() { |
| return getDuration(true, 0); |
| } |
| |
| float getDurationForNeutralPosition(float velocity) { |
| return getDuration(false, velocity); |
| } |
| |
| float getDurationForOffscreenPosition(float velocity) { |
| return getDuration(true, velocity); |
| } |
| |
| private float getDuration(boolean invert, float velocity) { |
| if (mView != null) { |
| final LayoutParams viewLp = (LayoutParams) mView.getLayoutParams(); |
| |
| float d = (float) Math.sqrt(Math.pow(viewLp.horizontalOffset, 2) + |
| Math.pow(viewLp.verticalOffset, 2)); |
| float maxd = (float) Math.sqrt(Math.pow(mSlideAmount, 2) + |
| Math.pow(0.4f * mSlideAmount, 2)); |
| |
| if (velocity == 0) { |
| return (invert ? (1 - d / maxd) : d / maxd) * DEFAULT_ANIMATION_DURATION; |
| } else { |
| float duration = invert ? d / Math.abs(velocity) : |
| (maxd - d) / Math.abs(velocity); |
| if (duration < MINIMUM_ANIMATION_DURATION || |
| duration > DEFAULT_ANIMATION_DURATION) { |
| return getDuration(invert, 0); |
| } else { |
| return duration; |
| } |
| } |
| } |
| return 0; |
| } |
| |
| public float getYProgress() { |
| return mYProgress; |
| } |
| |
| public float getXProgress() { |
| return mXProgress; |
| } |
| } |
| |
| @Override |
| public void onRemoteAdapterConnected() { |
| super.onRemoteAdapterConnected(); |
| // On first run, we want to set the stack to the end. |
| if (mAdapter != null && mWhichChild == -1) { |
| mWhichChild = mAdapter.getCount() - 1; |
| } |
| if (mWhichChild >= 0) { |
| setDisplayedChild(mWhichChild); |
| } |
| } |
| |
| LayoutParams createOrReuseLayoutParams(View v) { |
| final ViewGroup.LayoutParams currentLp = v.getLayoutParams(); |
| if (currentLp instanceof LayoutParams) { |
| LayoutParams lp = (LayoutParams) currentLp; |
| lp.setHorizontalOffset(0); |
| lp.setVerticalOffset(0); |
| lp.width = 0; |
| lp.width = 0; |
| return lp; |
| } |
| return new LayoutParams(v); |
| } |
| |
| @Override |
| protected void onLayout(boolean changed, int left, int top, int right, int bottom) { |
| boolean dataChanged = mDataChanged; |
| if (dataChanged) { |
| handleDataChanged(); |
| |
| // if the data changes, mWhichChild might be out of the bounds of the adapter |
| // in this case, we reset mWhichChild to the beginning |
| if (mWhichChild >= mAdapter.getCount()) |
| mWhichChild = 0; |
| |
| showOnly(mWhichChild, true, true); |
| refreshChildren(); |
| } |
| |
| final int childCount = getChildCount(); |
| for (int i = 0; i < childCount; i++) { |
| final View child = getChildAt(i); |
| |
| int childRight = mPaddingLeft + child.getMeasuredWidth(); |
| int childBottom = mPaddingTop + child.getMeasuredHeight(); |
| LayoutParams lp = (LayoutParams) child.getLayoutParams(); |
| |
| child.layout(mPaddingLeft + lp.horizontalOffset, mPaddingTop + lp.verticalOffset, |
| childRight + lp.horizontalOffset, childBottom + lp.verticalOffset); |
| |
| } |
| |
| mDataChanged = false; |
| onLayout(); |
| } |
| |
| private void measureChildren() { |
| final int count = getChildCount(); |
| final int childWidth = mMeasuredWidth - mPaddingLeft - mPaddingRight; |
| final int childHeight = Math.round(mMeasuredHeight*(1-PERSPECTIVE_SHIFT_FACTOR)) |
| - mPaddingTop - mPaddingBottom; |
| |
| for (int i = 0; i < count; i++) { |
| final View child = getChildAt(i); |
| child.measure(MeasureSpec.makeMeasureSpec(childWidth, MeasureSpec.EXACTLY), |
| MeasureSpec.makeMeasureSpec(childHeight, MeasureSpec.EXACTLY)); |
| } |
| } |
| |
| @Override |
| protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { |
| int widthSpecSize = MeasureSpec.getSize(widthMeasureSpec); |
| int heightSpecSize = MeasureSpec.getSize(heightMeasureSpec); |
| final int widthSpecMode = MeasureSpec.getMode(widthMeasureSpec); |
| final int heightSpecMode = MeasureSpec.getMode(heightMeasureSpec); |
| |
| boolean haveChildRefSize = (mReferenceChildWidth != -1 && mReferenceChildHeight != -1); |
| |
| // We need to deal with the case where our parent hasn't told us how |
| // big we should be. In this case we should |
| float factor = 1/(1 - PERSPECTIVE_SHIFT_FACTOR); |
| if (heightSpecMode == MeasureSpec.UNSPECIFIED) { |
| heightSpecSize = haveChildRefSize ? |
| Math.round(mReferenceChildHeight * (1 + factor)) + |
| mPaddingTop + mPaddingBottom : 0; |
| } else if (heightSpecMode == MeasureSpec.AT_MOST) { |
| heightSpecSize = haveChildRefSize ? Math.min( |
| Math.round(mReferenceChildHeight * (1 + factor)) + mPaddingTop + |
| mPaddingBottom, heightSpecSize) : 0; |
| } |
| |
| if (widthSpecMode == MeasureSpec.UNSPECIFIED) { |
| widthSpecSize = haveChildRefSize ? mReferenceChildWidth + mPaddingLeft + |
| mPaddingRight : 0; |
| } else if (heightSpecMode == MeasureSpec.AT_MOST) { |
| widthSpecSize = haveChildRefSize ? Math.min(mReferenceChildWidth + mPaddingLeft + |
| mPaddingRight, widthSpecSize) : 0; |
| } |
| |
| setMeasuredDimension(widthSpecSize, heightSpecSize); |
| measureChildren(); |
| } |
| |
| class LayoutParams extends ViewGroup.LayoutParams { |
| int horizontalOffset; |
| int verticalOffset; |
| View mView; |
| |
| LayoutParams(View view) { |
| super(0, 0); |
| width = 0; |
| height = 0; |
| horizontalOffset = 0; |
| verticalOffset = 0; |
| mView = view; |
| } |
| |
| LayoutParams(Context c, AttributeSet attrs) { |
| super(c, attrs); |
| horizontalOffset = 0; |
| verticalOffset = 0; |
| width = 0; |
| height = 0; |
| } |
| |
| private Rect parentRect = new Rect(); |
| void invalidateGlobalRegion(View v, Rect r) { |
| View p = v; |
| if (!(v.getParent() != null && v.getParent() instanceof View)) return; |
| |
| boolean firstPass = true; |
| parentRect.set(0, 0, 0, 0); |
| int depth = 0; |
| while (p.getParent() != null && p.getParent() instanceof View |
| && !parentRect.contains(r)) { |
| if (!firstPass) { |
| r.offset(p.getLeft() - p.getScrollX(), p.getTop() - p.getScrollY()); |
| depth++; |
| } |
| firstPass = false; |
| p = (View) p.getParent(); |
| parentRect.set(p.getScrollX(), p.getScrollY(), |
| p.getWidth() + p.getScrollX(), p.getHeight() + p.getScrollY()); |
| |
| // TODO: we need to stop early here if we've hit the edge of the screen |
| // so as to prevent us from walking too high in the hierarchy. A lot of this |
| // code might become a lot more straightforward. |
| } |
| |
| if (depth > mAncestorHeight) { |
| mAncestorContainingAllChildren = (ViewGroup) p; |
| mAncestorHeight = depth; |
| disableParentalClipping(); |
| } |
| |
| p.invalidate(r.left, r.top, r.right, r.bottom); |
| } |
| |
| private Rect invalidateRect = new Rect(); |
| private RectF invalidateRectf = new RectF(); |
| // This is public so that ObjectAnimator can access it |
| public void setVerticalOffset(int newVerticalOffset) { |
| int offsetDelta = newVerticalOffset - verticalOffset; |
| verticalOffset = newVerticalOffset; |
| |
| if (mView != null) { |
| mView.requestLayout(); |
| int top = Math.min(mView.getTop() + offsetDelta, mView.getTop()); |
| int bottom = Math.max(mView.getBottom() + offsetDelta, mView.getBottom()); |
| |
| invalidateRectf.set(mView.getLeft(), top, mView.getRight(), bottom); |
| |
| float xoffset = -invalidateRectf.left; |
| float yoffset = -invalidateRectf.top; |
| invalidateRectf.offset(xoffset, yoffset); |
| mView.getMatrix().mapRect(invalidateRectf); |
| invalidateRectf.offset(-xoffset, -yoffset); |
| invalidateRect.set((int) Math.floor(invalidateRectf.left), |
| (int) Math.floor(invalidateRectf.top), |
| (int) Math.ceil(invalidateRectf.right), |
| (int) Math.ceil(invalidateRectf.bottom)); |
| |
| invalidateGlobalRegion(mView, invalidateRect); |
| } |
| } |
| |
| public void setHorizontalOffset(int newHorizontalOffset) { |
| int offsetDelta = newHorizontalOffset - horizontalOffset; |
| horizontalOffset = newHorizontalOffset; |
| |
| if (mView != null) { |
| mView.requestLayout(); |
| int left = Math.min(mView.getLeft() + offsetDelta, mView.getLeft()); |
| int right = Math.max(mView.getRight() + offsetDelta, mView.getRight()); |
| invalidateRectf.set(left, mView.getTop(), right, mView.getBottom()); |
| |
| float xoffset = -invalidateRectf.left; |
| float yoffset = -invalidateRectf.top; |
| invalidateRectf.offset(xoffset, yoffset); |
| mView.getMatrix().mapRect(invalidateRectf); |
| invalidateRectf.offset(-xoffset, -yoffset); |
| |
| invalidateRect.set((int) Math.floor(invalidateRectf.left), |
| (int) Math.floor(invalidateRectf.top), |
| (int) Math.ceil(invalidateRectf.right), |
| (int) Math.ceil(invalidateRectf.bottom)); |
| |
| invalidateGlobalRegion(mView, invalidateRect); |
| } |
| } |
| } |
| |
| private static class HolographicHelper { |
| private final Paint mHolographicPaint = new Paint(); |
| private final Paint mErasePaint = new Paint(); |
| private final Paint mBlurPaint = new Paint(); |
| |
| HolographicHelper(Context context) { |
| initializePaints(context); |
| } |
| |
| void initializePaints(Context context) { |
| final float density = context.getResources().getDisplayMetrics().density; |
| |
| mHolographicPaint.setColor(0xff6699ff); |
| mHolographicPaint.setFilterBitmap(true); |
| mHolographicPaint.setMaskFilter(TableMaskFilter.CreateClipTable(0, 30)); |
| mErasePaint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.DST_OUT)); |
| mErasePaint.setFilterBitmap(true); |
| mBlurPaint.setMaskFilter(new BlurMaskFilter(2*density, BlurMaskFilter.Blur.NORMAL)); |
| } |
| |
| Bitmap createOutline(View v) { |
| if (v.getMeasuredWidth() == 0 || v.getMeasuredHeight() == 0) { |
| return null; |
| } |
| |
| Bitmap bitmap = Bitmap.createBitmap(v.getMeasuredWidth(), v.getMeasuredHeight(), |
| Bitmap.Config.ARGB_8888); |
| Canvas canvas = new Canvas(bitmap); |
| |
| float rotationX = v.getRotationX(); |
| float rotation = v.getRotation(); |
| float translationY = v.getTranslationY(); |
| v.setRotationX(0); |
| v.setRotation(0); |
| v.setTranslationY(0); |
| v.draw(canvas); |
| v.setRotationX(rotationX); |
| v.setRotation(rotation); |
| v.setTranslationY(translationY); |
| |
| drawOutline(canvas, bitmap); |
| return bitmap; |
| } |
| |
| final Matrix id = new Matrix(); |
| void drawOutline(Canvas dest, Bitmap src) { |
| int[] xy = new int[2]; |
| Bitmap mask = src.extractAlpha(mBlurPaint, xy); |
| Canvas maskCanvas = new Canvas(mask); |
| maskCanvas.drawBitmap(src, -xy[0], -xy[1], mErasePaint); |
| dest.drawColor(0, PorterDuff.Mode.CLEAR); |
| dest.setMatrix(id); |
| dest.drawBitmap(mask, xy[0], xy[1], mHolographicPaint); |
| mask.recycle(); |
| } |
| } |
| } |