| /* 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.ObjectAnimator; |
| import android.animation.PropertyValuesHolder; |
| import android.content.Context; |
| import android.content.res.TypedArray; |
| 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.Region; |
| import android.graphics.TableMaskFilter; |
| import android.os.Bundle; |
| import android.util.AttributeSet; |
| import android.util.Log; |
| import android.view.InputDevice; |
| import android.view.MotionEvent; |
| import android.view.VelocityTracker; |
| import android.view.View; |
| import android.view.ViewConfiguration; |
| import android.view.ViewGroup; |
| import android.view.accessibility.AccessibilityNodeInfo; |
| import android.view.animation.LinearInterpolator; |
| import android.widget.RemoteViews.RemoteView; |
| |
| import java.lang.ref.WeakReference; |
| |
| @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 static final int DEFAULT_ANIMATION_DURATION = 400; |
| private static final int MINIMUM_ANIMATION_DURATION = 50; |
| private static final int STACK_RELAYOUT_DURATION = 100; |
| |
| /** |
| * Parameters effecting the perspective visuals |
| */ |
| private static final float PERSPECTIVE_SHIFT_FACTOR_Y = 0.1f; |
| private static final float PERSPECTIVE_SHIFT_FACTOR_X = 0.1f; |
| |
| private float mPerspectiveShiftX; |
| private float mPerspectiveShiftY; |
| private float mNewPerspectiveShiftX; |
| private float mNewPerspectiveShiftY; |
| |
| @SuppressWarnings({"FieldCanBeLocal"}) |
| private static final float PERSPECTIVE_SCALE_FACTOR = 0f; |
| |
| /** |
| * 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 = 0.2f; |
| |
| /** |
| * Specifies the total distance, relative to the size of the stack, |
| * that views will be slid, either up or down |
| */ |
| 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; |
| |
| private final Rect mTouchRect = new Rect(); |
| |
| private static final int MIN_TIME_BETWEEN_INTERACTION_AND_AUTOADVANCE = 5000; |
| |
| private static final long MIN_TIME_BETWEEN_SCROLLS = 100; |
| |
| /** |
| * 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 boolean mTransitionIsSetup = false; |
| private int mResOutColor; |
| private int mClickColor; |
| |
| private static HolographicHelper sHolographicHelper; |
| private ImageView mHighlight; |
| private ImageView mClickFeedback; |
| private boolean mClickFeedbackIsValid = false; |
| private StackSlider mStackSlider; |
| private boolean mFirstLayoutHappened = false; |
| private long mLastInteractionTime = 0; |
| private long mLastScrollTime; |
| private int mStackMode; |
| private int mFramePadding; |
| private final Rect stackInvalidateRect = new Rect(); |
| |
| /** |
| * {@inheritDoc} |
| */ |
| public StackView(Context context) { |
| this(context, null); |
| } |
| |
| /** |
| * {@inheritDoc} |
| */ |
| public StackView(Context context, AttributeSet attrs) { |
| this(context, attrs, com.android.internal.R.attr.stackViewStyle); |
| } |
| |
| /** |
| * {@inheritDoc} |
| */ |
| public StackView(Context context, AttributeSet attrs, int defStyleAttr) { |
| this(context, attrs, defStyleAttr, 0); |
| } |
| |
| /** |
| * {@inheritDoc} |
| */ |
| public StackView(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) { |
| super(context, attrs, defStyleAttr, defStyleRes); |
| final TypedArray a = context.obtainStyledAttributes( |
| attrs, com.android.internal.R.styleable.StackView, defStyleAttr, defStyleRes); |
| |
| mResOutColor = a.getColor( |
| com.android.internal.R.styleable.StackView_resOutColor, 0); |
| mClickColor = a.getColor( |
| com.android.internal.R.styleable.StackView_clickColor, 0); |
| |
| a.recycle(); |
| initStackView(); |
| } |
| |
| private void initStackView() { |
| configureViewAnimator(NUM_ACTIVE_VIEWS, 1); |
| 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)); |
| |
| mClickFeedback = new ImageView(getContext()); |
| mClickFeedback.setLayoutParams(new LayoutParams(mClickFeedback)); |
| addViewInLayout(mClickFeedback, -1, new LayoutParams(mClickFeedback)); |
| mClickFeedback.setVisibility(INVISIBLE); |
| |
| 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 transformViewForTransition(int fromIndex, int toIndex, final View view, boolean animate) { |
| if (!animate) { |
| ((StackFrame) view).cancelSliderAnimator(); |
| view.setRotationX(0f); |
| LayoutParams lp = (LayoutParams) view.getLayoutParams(); |
| lp.setVerticalOffset(0); |
| lp.setHorizontalOffset(0); |
| } |
| |
| if (fromIndex == -1 && toIndex == getNumActiveViews() -1) { |
| transformViewAtIndex(toIndex, view, false); |
| view.setVisibility(VISIBLE); |
| view.setAlpha(1.0f); |
| } else if (fromIndex == 0 && toIndex == 1) { |
| // Slide item in |
| ((StackFrame) view).cancelSliderAnimator(); |
| view.setVisibility(VISIBLE); |
| |
| int duration = Math.round(mStackSlider.getDurationForNeutralPosition(mYVelocity)); |
| StackSlider animationSlider = new StackSlider(mStackSlider); |
| animationSlider.setView(view); |
| |
| if (animate) { |
| PropertyValuesHolder slideInY = PropertyValuesHolder.ofFloat("YProgress", 0.0f); |
| PropertyValuesHolder slideInX = PropertyValuesHolder.ofFloat("XProgress", 0.0f); |
| ObjectAnimator slideIn = ObjectAnimator.ofPropertyValuesHolder(animationSlider, |
| slideInX, slideInY); |
| slideIn.setDuration(duration); |
| slideIn.setInterpolator(new LinearInterpolator()); |
| ((StackFrame) view).setSliderAnimator(slideIn); |
| slideIn.start(); |
| } else { |
| animationSlider.setYProgress(0f); |
| animationSlider.setXProgress(0f); |
| } |
| } else if (fromIndex == 1 && toIndex == 0) { |
| // Slide item out |
| ((StackFrame) view).cancelSliderAnimator(); |
| int duration = Math.round(mStackSlider.getDurationForOffscreenPosition(mYVelocity)); |
| |
| StackSlider animationSlider = new StackSlider(mStackSlider); |
| animationSlider.setView(view); |
| if (animate) { |
| PropertyValuesHolder slideOutY = PropertyValuesHolder.ofFloat("YProgress", 1.0f); |
| PropertyValuesHolder slideOutX = PropertyValuesHolder.ofFloat("XProgress", 0.0f); |
| ObjectAnimator slideOut = ObjectAnimator.ofPropertyValuesHolder(animationSlider, |
| slideOutX, slideOutY); |
| slideOut.setDuration(duration); |
| slideOut.setInterpolator(new LinearInterpolator()); |
| ((StackFrame) view).setSliderAnimator(slideOut); |
| slideOut.start(); |
| } else { |
| animationSlider.setYProgress(1.0f); |
| animationSlider.setXProgress(0f); |
| } |
| } else if (toIndex == 0) { |
| // Make sure this view that is "waiting in the wings" is invisible |
| view.setAlpha(0.0f); |
| view.setVisibility(INVISIBLE); |
| } else if ((fromIndex == 0 || fromIndex == 1) && toIndex > 1) { |
| view.setVisibility(VISIBLE); |
| view.setAlpha(1.0f); |
| view.setRotationX(0f); |
| LayoutParams lp = (LayoutParams) view.getLayoutParams(); |
| lp.setVerticalOffset(0); |
| lp.setHorizontalOffset(0); |
| } else if (fromIndex == -1) { |
| view.setAlpha(1.0f); |
| view.setVisibility(VISIBLE); |
| } else if (toIndex == -1) { |
| if (animate) { |
| postDelayed(new Runnable() { |
| public void run() { |
| view.setAlpha(0); |
| } |
| }, STACK_RELAYOUT_DURATION); |
| } else { |
| view.setAlpha(0f); |
| } |
| } |
| |
| // Implement the faked perspective |
| if (toIndex != -1) { |
| transformViewAtIndex(toIndex, view, animate); |
| } |
| } |
| |
| private void transformViewAtIndex(int index, final View view, boolean animate) { |
| final float maxPerspectiveShiftY = mPerspectiveShiftY; |
| final float maxPerspectiveShiftX = mPerspectiveShiftX; |
| |
| if (mStackMode == ITEMS_SLIDE_DOWN) { |
| index = mMaxNumActiveViews - index - 1; |
| if (index == mMaxNumActiveViews - 1) index--; |
| } else { |
| index--; |
| if (index < 0) index++; |
| } |
| |
| float r = (index * 1.0f) / (mMaxNumActiveViews - 2); |
| |
| final float scale = 1 - PERSPECTIVE_SCALE_FACTOR * (1 - r); |
| |
| float perspectiveTranslationY = r * maxPerspectiveShiftY; |
| float scaleShiftCorrectionY = (scale - 1) * |
| (getMeasuredHeight() * (1 - PERSPECTIVE_SHIFT_FACTOR_Y) / 2.0f); |
| final float transY = perspectiveTranslationY + scaleShiftCorrectionY; |
| |
| float perspectiveTranslationX = (1 - r) * maxPerspectiveShiftX; |
| float scaleShiftCorrectionX = (1 - scale) * |
| (getMeasuredWidth() * (1 - PERSPECTIVE_SHIFT_FACTOR_X) / 2.0f); |
| final float transX = perspectiveTranslationX + scaleShiftCorrectionX; |
| |
| // If this view is currently being animated for a certain position, we need to cancel |
| // this animation so as not to interfere with the new transformation. |
| if (view instanceof StackFrame) { |
| ((StackFrame) view).cancelTransformAnimator(); |
| } |
| |
| if (animate) { |
| PropertyValuesHolder translationX = PropertyValuesHolder.ofFloat("translationX", transX); |
| PropertyValuesHolder translationY = PropertyValuesHolder.ofFloat("translationY", transY); |
| PropertyValuesHolder scalePropX = PropertyValuesHolder.ofFloat("scaleX", scale); |
| PropertyValuesHolder scalePropY = PropertyValuesHolder.ofFloat("scaleY", scale); |
| |
| ObjectAnimator oa = ObjectAnimator.ofPropertyValuesHolder(view, scalePropX, scalePropY, |
| translationY, translationX); |
| oa.setDuration(STACK_RELAYOUT_DURATION); |
| if (view instanceof StackFrame) { |
| ((StackFrame) view).setTransformAnimator(oa); |
| } |
| oa.start(); |
| } else { |
| view.setTranslationX(transX); |
| view.setTranslationY(transY); |
| view.setScaleX(scale); |
| view.setScaleY(scale); |
| } |
| } |
| |
| private void setupStackSlider(View v, int mode) { |
| mStackSlider.setMode(mode); |
| if (v != null) { |
| mHighlight.setImageBitmap(sHolographicHelper.createResOutline(v, mResOutColor)); |
| mHighlight.setRotation(v.getRotation()); |
| mHighlight.setTranslationY(v.getTranslationY()); |
| mHighlight.setTranslationX(v.getTranslationX()); |
| mHighlight.bringToFront(); |
| v.bringToFront(); |
| mStackSlider.setView(v); |
| |
| v.setVisibility(VISIBLE); |
| } |
| } |
| |
| /** |
| * {@inheritDoc} |
| */ |
| @Override |
| @android.view.RemotableViewMethod |
| public void showNext() { |
| if (mSwipeGestureType != GESTURE_NONE) return; |
| if (!mTransitionIsSetup) { |
| View v = getViewAtRelativeIndex(1); |
| if (v != null) { |
| setupStackSlider(v, StackSlider.NORMAL_MODE); |
| mStackSlider.setYProgress(0); |
| mStackSlider.setXProgress(0); |
| } |
| } |
| super.showNext(); |
| } |
| |
| /** |
| * {@inheritDoc} |
| */ |
| @Override |
| @android.view.RemotableViewMethod |
| public void showPrevious() { |
| if (mSwipeGestureType != GESTURE_NONE) return; |
| if (!mTransitionIsSetup) { |
| View v = getViewAtRelativeIndex(0); |
| if (v != null) { |
| setupStackSlider(v, StackSlider.NORMAL_MODE); |
| mStackSlider.setYProgress(1); |
| mStackSlider.setXProgress(0); |
| } |
| } |
| super.showPrevious(); |
| } |
| |
| @Override |
| void showOnly(int childIndex, boolean animate) { |
| super.showOnly(childIndex, animate); |
| |
| // Here we need to make sure that the z-order of the children is correct |
| for (int i = mCurrentWindowEnd; i >= mCurrentWindowStart; i--) { |
| int index = modulo(i, getWindowSize()); |
| ViewAndMetaData vm = mViewsMap.get(index); |
| if (vm != null) { |
| View v = mViewsMap.get(index).view; |
| if (v != null) v.bringToFront(); |
| } |
| } |
| if (mHighlight != null) { |
| mHighlight.bringToFront(); |
| } |
| mTransitionIsSetup = false; |
| mClickFeedbackIsValid = false; |
| } |
| |
| void updateClickFeedback() { |
| if (!mClickFeedbackIsValid) { |
| View v = getViewAtRelativeIndex(1); |
| if (v != null) { |
| mClickFeedback.setImageBitmap( |
| sHolographicHelper.createClickOutline(v, mClickColor)); |
| mClickFeedback.setTranslationX(v.getTranslationX()); |
| mClickFeedback.setTranslationY(v.getTranslationY()); |
| } |
| mClickFeedbackIsValid = true; |
| } |
| } |
| |
| @Override |
| void showTapFeedback(View v) { |
| updateClickFeedback(); |
| mClickFeedback.setVisibility(VISIBLE); |
| mClickFeedback.bringToFront(); |
| invalidate(); |
| } |
| |
| @Override |
| void hideTapFeedback(View v) { |
| mClickFeedback.setVisibility(INVISIBLE); |
| invalidate(); |
| } |
| |
| private void updateChildTransforms() { |
| for (int i = 0; i < getNumActiveViews(); i++) { |
| View v = getViewAtRelativeIndex(i); |
| if (v != null) { |
| transformViewAtIndex(i, v, false); |
| } |
| } |
| } |
| |
| private static class StackFrame extends FrameLayout { |
| WeakReference<ObjectAnimator> transformAnimator; |
| WeakReference<ObjectAnimator> sliderAnimator; |
| |
| public StackFrame(Context context) { |
| super(context); |
| } |
| |
| void setTransformAnimator(ObjectAnimator oa) { |
| transformAnimator = new WeakReference<ObjectAnimator>(oa); |
| } |
| |
| void setSliderAnimator(ObjectAnimator oa) { |
| sliderAnimator = new WeakReference<ObjectAnimator>(oa); |
| } |
| |
| boolean cancelTransformAnimator() { |
| if (transformAnimator != null) { |
| ObjectAnimator oa = transformAnimator.get(); |
| if (oa != null) { |
| oa.cancel(); |
| return true; |
| } |
| } |
| return false; |
| } |
| |
| boolean cancelSliderAnimator() { |
| if (sliderAnimator != null) { |
| ObjectAnimator oa = sliderAnimator.get(); |
| if (oa != null) { |
| oa.cancel(); |
| return true; |
| } |
| } |
| return false; |
| } |
| } |
| |
| @Override |
| FrameLayout getFrameForChild() { |
| StackFrame fl = new StackFrame(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) { |
| boolean expandClipRegion = false; |
| |
| canvas.getClipBounds(stackInvalidateRect); |
| final int childCount = getChildCount(); |
| for (int i = 0; i < childCount; i++) { |
| final View child = getChildAt(i); |
| LayoutParams lp = (LayoutParams) child.getLayoutParams(); |
| if ((lp.horizontalOffset == 0 && lp.verticalOffset == 0) || |
| child.getAlpha() == 0f || child.getVisibility() != VISIBLE) { |
| lp.resetInvalidateRect(); |
| } |
| Rect childInvalidateRect = lp.getInvalidateRect(); |
| if (!childInvalidateRect.isEmpty()) { |
| expandClipRegion = true; |
| stackInvalidateRect.union(childInvalidateRect); |
| } |
| } |
| |
| // We only expand the clip bounds if necessary. |
| if (expandClipRegion) { |
| canvas.save(Canvas.CLIP_SAVE_FLAG); |
| canvas.clipRect(stackInvalidateRect, Region.Op.UNION); |
| super.dispatchDraw(canvas); |
| canvas.restore(); |
| } else { |
| super.dispatchDraw(canvas); |
| } |
| } |
| |
| private void onLayout() { |
| if (!mFirstLayoutHappened) { |
| mFirstLayoutHappened = true; |
| updateChildTransforms(); |
| } |
| |
| final int newSlideAmount = Math.round(SLIDE_UP_RATIO * getMeasuredHeight()); |
| if (mSlideAmount != newSlideAmount) { |
| mSlideAmount = newSlideAmount; |
| mSwipeThreshold = Math.round(SWIPE_THRESHOLD_RATIO * newSlideAmount); |
| } |
| |
| if (Float.compare(mPerspectiveShiftY, mNewPerspectiveShiftY) != 0 || |
| Float.compare(mPerspectiveShiftX, mNewPerspectiveShiftX) != 0) { |
| |
| mPerspectiveShiftY = mNewPerspectiveShiftY; |
| mPerspectiveShiftX = mNewPerspectiveShiftX; |
| updateChildTransforms(); |
| } |
| } |
| |
| @Override |
| public boolean onGenericMotionEvent(MotionEvent event) { |
| if ((event.getSource() & InputDevice.SOURCE_CLASS_POINTER) != 0) { |
| switch (event.getAction()) { |
| case MotionEvent.ACTION_SCROLL: { |
| final float vscroll = event.getAxisValue(MotionEvent.AXIS_VSCROLL); |
| if (vscroll < 0) { |
| pacedScroll(false); |
| return true; |
| } else if (vscroll > 0) { |
| pacedScroll(true); |
| return true; |
| } |
| } |
| } |
| } |
| return super.onGenericMotionEvent(event); |
| } |
| |
| // This ensures that the frequency of stack flips caused by scrolls is capped |
| private void pacedScroll(boolean up) { |
| long timeSinceLastScroll = System.currentTimeMillis() - mLastScrollTime; |
| if (timeSinceLastScroll > MIN_TIME_BETWEEN_SCROLLS) { |
| if (up) { |
| showPrevious(); |
| } else { |
| showNext(); |
| } |
| mLastScrollTime = System.currentTimeMillis(); |
| } |
| } |
| |
| /** |
| * {@inheritDoc} |
| */ |
| @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) { |
| final int swipeGestureType = deltaY < 0 ? GESTURE_SLIDE_UP : GESTURE_SLIDE_DOWN; |
| cancelLongPress(); |
| requestDisallowInterceptTouchEvent(true); |
| |
| if (mAdapter == null) return; |
| final int adapterCount = getCount(); |
| |
| int activeIndex; |
| if (mStackMode == ITEMS_SLIDE_UP) { |
| activeIndex = (swipeGestureType == GESTURE_SLIDE_DOWN) ? 0 : 1; |
| } else { |
| activeIndex = (swipeGestureType == GESTURE_SLIDE_DOWN) ? 1 : 0; |
| } |
| |
| boolean endOfStack = mLoopViews && adapterCount == 1 |
| && ((mStackMode == ITEMS_SLIDE_UP && swipeGestureType == GESTURE_SLIDE_UP) |
| || (mStackMode == ITEMS_SLIDE_DOWN && swipeGestureType == GESTURE_SLIDE_DOWN)); |
| boolean beginningOfStack = mLoopViews && adapterCount == 1 |
| && ((mStackMode == ITEMS_SLIDE_DOWN && swipeGestureType == GESTURE_SLIDE_UP) |
| || (mStackMode == ITEMS_SLIDE_UP && swipeGestureType == GESTURE_SLIDE_DOWN)); |
| |
| int stackMode; |
| if (mLoopViews && !beginningOfStack && !endOfStack) { |
| stackMode = StackSlider.NORMAL_MODE; |
| } else if (mCurrentWindowStartUnbounded + activeIndex == -1 || beginningOfStack) { |
| activeIndex++; |
| stackMode = StackSlider.BEGINNING_OF_STACK_MODE; |
| } else if (mCurrentWindowStartUnbounded + activeIndex == adapterCount - 1 || endOfStack) { |
| stackMode = StackSlider.END_OF_STACK_MODE; |
| } else { |
| stackMode = StackSlider.NORMAL_MODE; |
| } |
| |
| mTransitionIsSetup = stackMode == StackSlider.NORMAL_MODE; |
| |
| View v = getViewAtRelativeIndex(activeIndex); |
| if (v == null) return; |
| |
| setupStackSlider(v, stackMode); |
| |
| // We only register this gesture if we've made it this far without a problem |
| mSwipeGestureType = swipeGestureType; |
| cancelHandleClick(); |
| } |
| } |
| |
| /** |
| * {@inheritDoc} |
| */ |
| @Override |
| public boolean onTouchEvent(MotionEvent ev) { |
| super.onTouchEvent(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 void onSecondaryPointerUp(MotionEvent ev) { |
| final int activePointerIndex = ev.getActionIndex(); |
| final int pointerId = ev.getPointerId(activePointerIndex); |
| if (pointerId == mActivePointerId) { |
| |
| int activeViewIndex = (mSwipeGestureType == GESTURE_SLIDE_DOWN) ? 0 : 1; |
| |
| 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); |
| |
| mTouchRect.set(v.getLeft(), v.getTop(), v.getRight(), v.getBottom()); |
| if (mTouchRect.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); |
| mLastInteractionTime = System.currentTimeMillis(); |
| |
| 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) { |
| // We reset the gesture variable, because otherwise we will ignore showPrevious() / |
| // showNext(); |
| mSwipeGestureType = GESTURE_NONE; |
| |
| // Swipe threshold exceeded, swipe down |
| if (mStackMode == ITEMS_SLIDE_UP) { |
| showPrevious(); |
| } else { |
| showNext(); |
| } |
| mHighlight.bringToFront(); |
| } else if (deltaY < -mSwipeThreshold && mSwipeGestureType == GESTURE_SLIDE_UP |
| && mStackSlider.mMode == StackSlider.NORMAL_MODE) { |
| // We reset the gesture variable, because otherwise we will ignore showPrevious() / |
| // showNext(); |
| mSwipeGestureType = GESTURE_NONE; |
| |
| // Swipe threshold exceeded, swipe up |
| if (mStackMode == ITEMS_SLIDE_UP) { |
| showNext(); |
| } else { |
| showPrevious(); |
| } |
| |
| 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 snapBackY = PropertyValuesHolder.ofFloat("YProgress", finalYProgress); |
| PropertyValuesHolder snapBackX = PropertyValuesHolder.ofFloat("XProgress", 0.0f); |
| ObjectAnimator pa = ObjectAnimator.ofPropertyValuesHolder(animationSlider, |
| snapBackX, snapBackY); |
| pa.setDuration(duration); |
| 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 snapBackY = |
| PropertyValuesHolder.ofFloat("YProgress",finalYProgress); |
| PropertyValuesHolder snapBackX = PropertyValuesHolder.ofFloat("XProgress", 0.0f); |
| ObjectAnimator pa = ObjectAnimator.ofPropertyValuesHolder(animationSlider, |
| snapBackX, snapBackY); |
| pa.setDuration(duration); |
| 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; |
| if (mView == null) return; |
| |
| final LayoutParams viewLp = (LayoutParams) mView.getLayoutParams(); |
| final LayoutParams highlightLp = (LayoutParams) mHighlight.getLayoutParams(); |
| |
| int stackDirection = (mStackMode == ITEMS_SLIDE_UP) ? 1 : -1; |
| |
| // We need to prevent any clipping issues which may arise by setting a layer type. |
| // This doesn't come for free however, so we only want to enable it when required. |
| if (Float.compare(0f, mYProgress) != 0 && Float.compare(1.0f, mYProgress) != 0) { |
| if (mView.getLayerType() == LAYER_TYPE_NONE) { |
| mView.setLayerType(LAYER_TYPE_HARDWARE, null); |
| } |
| } else { |
| if (mView.getLayerType() != LAYER_TYPE_NONE) { |
| mView.setLayerType(LAYER_TYPE_NONE, null); |
| } |
| } |
| |
| 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 END_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 BEGINNING_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; |
| |
| if (mView == null) return; |
| 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.hypot(viewLp.horizontalOffset, viewLp.verticalOffset); |
| float maxd = (float) Math.hypot(mSlideAmount, 0.4f * mSlideAmount); |
| if (d > maxd) { |
| // Because mSlideAmount is updated in onLayout(), it is possible that d > maxd |
| // if we get onLayout() right before this method is called. |
| d = maxd; |
| } |
| |
| 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; |
| } |
| |
| // Used for animations |
| @SuppressWarnings({"UnusedDeclaration"}) |
| public float getYProgress() { |
| return mYProgress; |
| } |
| |
| // Used for animations |
| @SuppressWarnings({"UnusedDeclaration"}) |
| public float getXProgress() { |
| return mXProgress; |
| } |
| } |
| |
| 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) { |
| checkForAndHandleDataChanged(); |
| |
| 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); |
| |
| } |
| onLayout(); |
| } |
| |
| @Override |
| public void advance() { |
| long timeSinceLastInteraction = System.currentTimeMillis() - mLastInteractionTime; |
| |
| if (mAdapter == null) return; |
| final int adapterCount = getCount(); |
| if (adapterCount == 1 && mLoopViews) return; |
| |
| if (mSwipeGestureType == GESTURE_NONE && |
| timeSinceLastInteraction > MIN_TIME_BETWEEN_INTERACTION_AND_AUTOADVANCE) { |
| showNext(); |
| } |
| } |
| |
| private void measureChildren() { |
| final int count = getChildCount(); |
| |
| final int measuredWidth = getMeasuredWidth(); |
| final int measuredHeight = getMeasuredHeight(); |
| |
| final int childWidth = Math.round(measuredWidth*(1-PERSPECTIVE_SHIFT_FACTOR_X)) |
| - mPaddingLeft - mPaddingRight; |
| final int childHeight = Math.round(measuredHeight*(1-PERSPECTIVE_SHIFT_FACTOR_Y)) |
| - mPaddingTop - mPaddingBottom; |
| |
| int maxWidth = 0; |
| int maxHeight = 0; |
| |
| for (int i = 0; i < count; i++) { |
| final View child = getChildAt(i); |
| child.measure(MeasureSpec.makeMeasureSpec(childWidth, MeasureSpec.AT_MOST), |
| MeasureSpec.makeMeasureSpec(childHeight, MeasureSpec.AT_MOST)); |
| |
| if (child != mHighlight && child != mClickFeedback) { |
| final int childMeasuredWidth = child.getMeasuredWidth(); |
| final int childMeasuredHeight = child.getMeasuredHeight(); |
| if (childMeasuredWidth > maxWidth) { |
| maxWidth = childMeasuredWidth; |
| } |
| if (childMeasuredHeight > maxHeight) { |
| maxHeight = childMeasuredHeight; |
| } |
| } |
| } |
| |
| mNewPerspectiveShiftX = PERSPECTIVE_SHIFT_FACTOR_X * measuredWidth; |
| mNewPerspectiveShiftY = PERSPECTIVE_SHIFT_FACTOR_Y * measuredHeight; |
| |
| // If we have extra space, we try and spread the items out |
| if (maxWidth > 0 && count > 0 && maxWidth < childWidth) { |
| mNewPerspectiveShiftX = measuredWidth - maxWidth; |
| } |
| |
| if (maxHeight > 0 && count > 0 && maxHeight < childHeight) { |
| mNewPerspectiveShiftY = measuredHeight - maxHeight; |
| } |
| } |
| |
| @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 factorY = 1/(1 - PERSPECTIVE_SHIFT_FACTOR_Y); |
| if (heightSpecMode == MeasureSpec.UNSPECIFIED) { |
| heightSpecSize = haveChildRefSize ? |
| Math.round(mReferenceChildHeight * (1 + factorY)) + |
| mPaddingTop + mPaddingBottom : 0; |
| } else if (heightSpecMode == MeasureSpec.AT_MOST) { |
| if (haveChildRefSize) { |
| int height = Math.round(mReferenceChildHeight * (1 + factorY)) |
| + mPaddingTop + mPaddingBottom; |
| if (height <= heightSpecSize) { |
| heightSpecSize = height; |
| } else { |
| heightSpecSize |= MEASURED_STATE_TOO_SMALL; |
| |
| } |
| } else { |
| heightSpecSize = 0; |
| } |
| } |
| |
| float factorX = 1/(1 - PERSPECTIVE_SHIFT_FACTOR_X); |
| if (widthSpecMode == MeasureSpec.UNSPECIFIED) { |
| widthSpecSize = haveChildRefSize ? |
| Math.round(mReferenceChildWidth * (1 + factorX)) + |
| mPaddingLeft + mPaddingRight : 0; |
| } else if (heightSpecMode == MeasureSpec.AT_MOST) { |
| if (haveChildRefSize) { |
| int width = mReferenceChildWidth + mPaddingLeft + mPaddingRight; |
| if (width <= widthSpecSize) { |
| widthSpecSize = width; |
| } else { |
| widthSpecSize |= MEASURED_STATE_TOO_SMALL; |
| } |
| } else { |
| widthSpecSize = 0; |
| } |
| } |
| setMeasuredDimension(widthSpecSize, heightSpecSize); |
| measureChildren(); |
| } |
| |
| @Override |
| public CharSequence getAccessibilityClassName() { |
| return StackView.class.getName(); |
| } |
| |
| /** @hide */ |
| @Override |
| public void onInitializeAccessibilityNodeInfoInternal(AccessibilityNodeInfo info) { |
| super.onInitializeAccessibilityNodeInfoInternal(info); |
| info.setScrollable(getChildCount() > 1); |
| if (isEnabled()) { |
| if (getDisplayedChild() < getChildCount() - 1) { |
| info.addAction(AccessibilityNodeInfo.ACTION_SCROLL_FORWARD); |
| } |
| if (getDisplayedChild() > 0) { |
| info.addAction(AccessibilityNodeInfo.ACTION_SCROLL_BACKWARD); |
| } |
| } |
| } |
| |
| /** @hide */ |
| @Override |
| public boolean performAccessibilityActionInternal(int action, Bundle arguments) { |
| if (super.performAccessibilityActionInternal(action, arguments)) { |
| return true; |
| } |
| if (!isEnabled()) { |
| return false; |
| } |
| switch (action) { |
| case AccessibilityNodeInfo.ACTION_SCROLL_FORWARD: { |
| if (getDisplayedChild() < getChildCount() - 1) { |
| showNext(); |
| return true; |
| } |
| } return false; |
| case AccessibilityNodeInfo.ACTION_SCROLL_BACKWARD: { |
| if (getDisplayedChild() > 0) { |
| showPrevious(); |
| return true; |
| } |
| } return false; |
| } |
| return false; |
| } |
| |
| class LayoutParams extends ViewGroup.LayoutParams { |
| int horizontalOffset; |
| int verticalOffset; |
| View mView; |
| private final Rect parentRect = new Rect(); |
| private final Rect invalidateRect = new Rect(); |
| private final RectF invalidateRectf = new RectF(); |
| private final Rect globalInvalidateRect = new Rect(); |
| |
| 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; |
| } |
| |
| void invalidateGlobalRegion(View v, Rect r) { |
| // We need to make a new rect here, so as not to modify the one passed |
| globalInvalidateRect.set(r); |
| globalInvalidateRect.union(0, 0, getWidth(), getHeight()); |
| View p = v; |
| if (!(v.getParent() != null && v.getParent() instanceof View)) return; |
| |
| boolean firstPass = true; |
| parentRect.set(0, 0, 0, 0); |
| while (p.getParent() != null && p.getParent() instanceof View |
| && !parentRect.contains(globalInvalidateRect)) { |
| if (!firstPass) { |
| globalInvalidateRect.offset(p.getLeft() - p.getScrollX(), p.getTop() |
| - p.getScrollY()); |
| } |
| firstPass = false; |
| p = (View) p.getParent(); |
| parentRect.set(p.getScrollX(), p.getScrollY(), |
| p.getWidth() + p.getScrollX(), p.getHeight() + p.getScrollY()); |
| p.invalidate(globalInvalidateRect.left, globalInvalidateRect.top, |
| globalInvalidateRect.right, globalInvalidateRect.bottom); |
| } |
| |
| p.invalidate(globalInvalidateRect.left, globalInvalidateRect.top, |
| globalInvalidateRect.right, globalInvalidateRect.bottom); |
| } |
| |
| Rect getInvalidateRect() { |
| return invalidateRect; |
| } |
| |
| void resetInvalidateRect() { |
| invalidateRect.set(0, 0, 0, 0); |
| } |
| |
| // This is public so that ObjectAnimator can access it |
| public void setVerticalOffset(int newVerticalOffset) { |
| setOffsets(horizontalOffset, newVerticalOffset); |
| } |
| |
| public void setHorizontalOffset(int newHorizontalOffset) { |
| setOffsets(newHorizontalOffset, verticalOffset); |
| } |
| |
| public void setOffsets(int newHorizontalOffset, int newVerticalOffset) { |
| int horizontalOffsetDelta = newHorizontalOffset - horizontalOffset; |
| horizontalOffset = newHorizontalOffset; |
| int verticalOffsetDelta = newVerticalOffset - verticalOffset; |
| verticalOffset = newVerticalOffset; |
| |
| if (mView != null) { |
| mView.requestLayout(); |
| int left = Math.min(mView.getLeft() + horizontalOffsetDelta, mView.getLeft()); |
| int right = Math.max(mView.getRight() + horizontalOffsetDelta, mView.getRight()); |
| int top = Math.min(mView.getTop() + verticalOffsetDelta, mView.getTop()); |
| int bottom = Math.max(mView.getBottom() + verticalOffsetDelta, mView.getBottom()); |
| |
| invalidateRectf.set(left, top, right, 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); |
| } |
| } |
| } |
| |
| private static class HolographicHelper { |
| private final Paint mHolographicPaint = new Paint(); |
| private final Paint mErasePaint = new Paint(); |
| private final Paint mBlurPaint = new Paint(); |
| private static final int RES_OUT = 0; |
| private static final int CLICK_FEEDBACK = 1; |
| private float mDensity; |
| private BlurMaskFilter mSmallBlurMaskFilter; |
| private BlurMaskFilter mLargeBlurMaskFilter; |
| private final Canvas mCanvas = new Canvas(); |
| private final Canvas mMaskCanvas = new Canvas(); |
| private final int[] mTmpXY = new int[2]; |
| private final Matrix mIdentityMatrix = new Matrix(); |
| |
| HolographicHelper(Context context) { |
| mDensity = context.getResources().getDisplayMetrics().density; |
| |
| mHolographicPaint.setFilterBitmap(true); |
| mHolographicPaint.setMaskFilter(TableMaskFilter.CreateClipTable(0, 30)); |
| mErasePaint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.DST_OUT)); |
| mErasePaint.setFilterBitmap(true); |
| |
| mSmallBlurMaskFilter = new BlurMaskFilter(2 * mDensity, BlurMaskFilter.Blur.NORMAL); |
| mLargeBlurMaskFilter = new BlurMaskFilter(4 * mDensity, BlurMaskFilter.Blur.NORMAL); |
| } |
| |
| Bitmap createClickOutline(View v, int color) { |
| return createOutline(v, CLICK_FEEDBACK, color); |
| } |
| |
| Bitmap createResOutline(View v, int color) { |
| return createOutline(v, RES_OUT, color); |
| } |
| |
| Bitmap createOutline(View v, int type, int color) { |
| mHolographicPaint.setColor(color); |
| if (type == RES_OUT) { |
| mBlurPaint.setMaskFilter(mSmallBlurMaskFilter); |
| } else if (type == CLICK_FEEDBACK) { |
| mBlurPaint.setMaskFilter(mLargeBlurMaskFilter); |
| } |
| |
| if (v.getMeasuredWidth() == 0 || v.getMeasuredHeight() == 0) { |
| return null; |
| } |
| |
| Bitmap bitmap = Bitmap.createBitmap(v.getResources().getDisplayMetrics(), |
| v.getMeasuredWidth(), v.getMeasuredHeight(), Bitmap.Config.ARGB_8888); |
| mCanvas.setBitmap(bitmap); |
| |
| float rotationX = v.getRotationX(); |
| float rotation = v.getRotation(); |
| float translationY = v.getTranslationY(); |
| float translationX = v.getTranslationX(); |
| v.setRotationX(0); |
| v.setRotation(0); |
| v.setTranslationY(0); |
| v.setTranslationX(0); |
| v.draw(mCanvas); |
| v.setRotationX(rotationX); |
| v.setRotation(rotation); |
| v.setTranslationY(translationY); |
| v.setTranslationX(translationX); |
| |
| drawOutline(mCanvas, bitmap); |
| mCanvas.setBitmap(null); |
| return bitmap; |
| } |
| |
| void drawOutline(Canvas dest, Bitmap src) { |
| final int[] xy = mTmpXY; |
| Bitmap mask = src.extractAlpha(mBlurPaint, xy); |
| mMaskCanvas.setBitmap(mask); |
| mMaskCanvas.drawBitmap(src, -xy[0], -xy[1], mErasePaint); |
| dest.drawColor(0, PorterDuff.Mode.CLEAR); |
| dest.setMatrix(mIdentityMatrix); |
| dest.drawBitmap(mask, xy[0], xy[1], mHolographicPaint); |
| mMaskCanvas.setBitmap(null); |
| mask.recycle(); |
| } |
| } |
| } |
