| /* |
| * Copyright (C) 2011 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.systemui; |
| |
| import android.animation.Animator; |
| import android.animation.AnimatorListenerAdapter; |
| import android.animation.ObjectAnimator; |
| import android.animation.Animator.AnimatorListener; |
| import android.animation.ValueAnimator; |
| import android.animation.ValueAnimator.AnimatorUpdateListener; |
| import android.graphics.RectF; |
| import android.os.Handler; |
| import android.util.Log; |
| import android.view.accessibility.AccessibilityEvent; |
| import android.view.animation.LinearInterpolator; |
| import android.view.MotionEvent; |
| import android.view.VelocityTracker; |
| import android.view.View; |
| import android.view.ViewConfiguration; |
| |
| public class SwipeHelper implements Gefingerpoken { |
| static final String TAG = "com.android.systemui.SwipeHelper"; |
| private static final boolean DEBUG = false; |
| private static final boolean DEBUG_INVALIDATE = false; |
| private static final boolean SLOW_ANIMATIONS = false; // DEBUG; |
| private static final boolean CONSTRAIN_SWIPE = true; |
| private static final boolean FADE_OUT_DURING_SWIPE = true; |
| private static final boolean DISMISS_IF_SWIPED_FAR_ENOUGH = true; |
| |
| public static final int X = 0; |
| public static final int Y = 1; |
| |
| private static LinearInterpolator sLinearInterpolator = new LinearInterpolator(); |
| |
| private float SWIPE_ESCAPE_VELOCITY = 100f; // dp/sec |
| private int DEFAULT_ESCAPE_ANIMATION_DURATION = 200; // ms |
| private int MAX_ESCAPE_ANIMATION_DURATION = 400; // ms |
| private int MAX_DISMISS_VELOCITY = 2000; // dp/sec |
| private static final int SNAP_ANIM_LEN = SLOW_ANIMATIONS ? 1000 : 150; // ms |
| |
| public static float ALPHA_FADE_START = 0f; // fraction of thumbnail width |
| // where fade starts |
| static final float ALPHA_FADE_END = 0.5f; // fraction of thumbnail width |
| // beyond which alpha->0 |
| private float mMinAlpha = 0f; |
| |
| private float mPagingTouchSlop; |
| private Callback mCallback; |
| private Handler mHandler; |
| private int mSwipeDirection; |
| private VelocityTracker mVelocityTracker; |
| |
| private float mInitialTouchPos; |
| private boolean mDragging; |
| private View mCurrView; |
| private View mCurrAnimView; |
| private boolean mCanCurrViewBeDimissed; |
| private float mDensityScale; |
| |
| private boolean mLongPressSent; |
| private View.OnLongClickListener mLongPressListener; |
| private Runnable mWatchLongPress; |
| private long mLongPressTimeout; |
| |
| public SwipeHelper(int swipeDirection, Callback callback, float densityScale, |
| float pagingTouchSlop) { |
| mCallback = callback; |
| mHandler = new Handler(); |
| mSwipeDirection = swipeDirection; |
| mVelocityTracker = VelocityTracker.obtain(); |
| mDensityScale = densityScale; |
| mPagingTouchSlop = pagingTouchSlop; |
| |
| mLongPressTimeout = (long) (ViewConfiguration.getLongPressTimeout() * 1.5f); // extra long-press! |
| } |
| |
| public void setLongPressListener(View.OnLongClickListener listener) { |
| mLongPressListener = listener; |
| } |
| |
| public void setDensityScale(float densityScale) { |
| mDensityScale = densityScale; |
| } |
| |
| public void setPagingTouchSlop(float pagingTouchSlop) { |
| mPagingTouchSlop = pagingTouchSlop; |
| } |
| |
| private float getPos(MotionEvent ev) { |
| return mSwipeDirection == X ? ev.getX() : ev.getY(); |
| } |
| |
| private float getTranslation(View v) { |
| return mSwipeDirection == X ? v.getTranslationX() : v.getTranslationY(); |
| } |
| |
| private float getVelocity(VelocityTracker vt) { |
| return mSwipeDirection == X ? vt.getXVelocity() : |
| vt.getYVelocity(); |
| } |
| |
| private ObjectAnimator createTranslationAnimation(View v, float newPos) { |
| ObjectAnimator anim = ObjectAnimator.ofFloat(v, |
| mSwipeDirection == X ? "translationX" : "translationY", newPos); |
| return anim; |
| } |
| |
| private float getPerpendicularVelocity(VelocityTracker vt) { |
| return mSwipeDirection == X ? vt.getYVelocity() : |
| vt.getXVelocity(); |
| } |
| |
| private void setTranslation(View v, float translate) { |
| if (mSwipeDirection == X) { |
| v.setTranslationX(translate); |
| } else { |
| v.setTranslationY(translate); |
| } |
| } |
| |
| private float getSize(View v) { |
| return mSwipeDirection == X ? v.getMeasuredWidth() : |
| v.getMeasuredHeight(); |
| } |
| |
| public void setMinAlpha(float minAlpha) { |
| mMinAlpha = minAlpha; |
| } |
| |
| private float getAlphaForOffset(View view) { |
| float viewSize = getSize(view); |
| final float fadeSize = ALPHA_FADE_END * viewSize; |
| float result = 1.0f; |
| float pos = getTranslation(view); |
| if (pos >= viewSize * ALPHA_FADE_START) { |
| result = 1.0f - (pos - viewSize * ALPHA_FADE_START) / fadeSize; |
| } else if (pos < viewSize * (1.0f - ALPHA_FADE_START)) { |
| result = 1.0f + (viewSize * ALPHA_FADE_START + pos) / fadeSize; |
| } |
| return Math.max(mMinAlpha, result); |
| } |
| |
| private void updateAlphaFromOffset(View animView, boolean dismissable) { |
| if (FADE_OUT_DURING_SWIPE && dismissable) { |
| float alpha = getAlphaForOffset(animView); |
| if (alpha != 0f && alpha != 1f) { |
| animView.setLayerType(View.LAYER_TYPE_HARDWARE, null); |
| } else { |
| animView.setLayerType(View.LAYER_TYPE_NONE, null); |
| } |
| animView.setAlpha(getAlphaForOffset(animView)); |
| } |
| invalidateGlobalRegion(animView); |
| } |
| |
| // invalidate the view's own bounds all the way up the view hierarchy |
| public static void invalidateGlobalRegion(View view) { |
| invalidateGlobalRegion( |
| view, |
| new RectF(view.getLeft(), view.getTop(), view.getRight(), view.getBottom())); |
| } |
| |
| // invalidate a rectangle relative to the view's coordinate system all the way up the view |
| // hierarchy |
| public static void invalidateGlobalRegion(View view, RectF childBounds) { |
| //childBounds.offset(view.getTranslationX(), view.getTranslationY()); |
| if (DEBUG_INVALIDATE) |
| Log.v(TAG, "-------------"); |
| while (view.getParent() != null && view.getParent() instanceof View) { |
| view = (View) view.getParent(); |
| view.getMatrix().mapRect(childBounds); |
| view.invalidate((int) Math.floor(childBounds.left), |
| (int) Math.floor(childBounds.top), |
| (int) Math.ceil(childBounds.right), |
| (int) Math.ceil(childBounds.bottom)); |
| if (DEBUG_INVALIDATE) { |
| Log.v(TAG, "INVALIDATE(" + (int) Math.floor(childBounds.left) |
| + "," + (int) Math.floor(childBounds.top) |
| + "," + (int) Math.ceil(childBounds.right) |
| + "," + (int) Math.ceil(childBounds.bottom)); |
| } |
| } |
| } |
| |
| public void removeLongPressCallback() { |
| if (mWatchLongPress != null) { |
| mHandler.removeCallbacks(mWatchLongPress); |
| mWatchLongPress = null; |
| } |
| } |
| |
| public boolean onInterceptTouchEvent(MotionEvent ev) { |
| final int action = ev.getAction(); |
| |
| switch (action) { |
| case MotionEvent.ACTION_DOWN: |
| mDragging = false; |
| mLongPressSent = false; |
| mCurrView = mCallback.getChildAtPosition(ev); |
| mVelocityTracker.clear(); |
| if (mCurrView != null) { |
| mCurrAnimView = mCallback.getChildContentView(mCurrView); |
| mCanCurrViewBeDimissed = mCallback.canChildBeDismissed(mCurrView); |
| mVelocityTracker.addMovement(ev); |
| mInitialTouchPos = getPos(ev); |
| |
| if (mLongPressListener != null) { |
| if (mWatchLongPress == null) { |
| mWatchLongPress = new Runnable() { |
| @Override |
| public void run() { |
| if (mCurrView != null && !mLongPressSent) { |
| mLongPressSent = true; |
| mCurrView.sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_LONG_CLICKED); |
| mLongPressListener.onLongClick(mCurrView); |
| } |
| } |
| }; |
| } |
| mHandler.postDelayed(mWatchLongPress, mLongPressTimeout); |
| } |
| |
| } |
| break; |
| |
| case MotionEvent.ACTION_MOVE: |
| if (mCurrView != null && !mLongPressSent) { |
| mVelocityTracker.addMovement(ev); |
| float pos = getPos(ev); |
| float delta = pos - mInitialTouchPos; |
| if (Math.abs(delta) > mPagingTouchSlop) { |
| mCallback.onBeginDrag(mCurrView); |
| mDragging = true; |
| mInitialTouchPos = getPos(ev) - getTranslation(mCurrAnimView); |
| |
| removeLongPressCallback(); |
| } |
| } |
| |
| break; |
| |
| case MotionEvent.ACTION_UP: |
| case MotionEvent.ACTION_CANCEL: |
| mDragging = false; |
| mCurrView = null; |
| mCurrAnimView = null; |
| mLongPressSent = false; |
| removeLongPressCallback(); |
| break; |
| } |
| return mDragging; |
| } |
| |
| /** |
| * @param view The view to be dismissed |
| * @param velocity The desired pixels/second speed at which the view should move |
| */ |
| public void dismissChild(final View view, float velocity) { |
| final View animView = mCallback.getChildContentView(view); |
| final boolean canAnimViewBeDismissed = mCallback.canChildBeDismissed(view); |
| float newPos; |
| |
| if (velocity < 0 |
| || (velocity == 0 && getTranslation(animView) < 0) |
| // if we use the Menu to dismiss an item in landscape, animate up |
| || (velocity == 0 && getTranslation(animView) == 0 && mSwipeDirection == Y)) { |
| newPos = -getSize(animView); |
| } else { |
| newPos = getSize(animView); |
| } |
| int duration = MAX_ESCAPE_ANIMATION_DURATION; |
| if (velocity != 0) { |
| duration = Math.min(duration, |
| (int) (Math.abs(newPos - getTranslation(animView)) * 1000f / Math |
| .abs(velocity))); |
| } else { |
| duration = DEFAULT_ESCAPE_ANIMATION_DURATION; |
| } |
| |
| animView.setLayerType(View.LAYER_TYPE_HARDWARE, null); |
| ObjectAnimator anim = createTranslationAnimation(animView, newPos); |
| anim.setInterpolator(sLinearInterpolator); |
| anim.setDuration(duration); |
| anim.addListener(new AnimatorListenerAdapter() { |
| public void onAnimationEnd(Animator animation) { |
| mCallback.onChildDismissed(view); |
| animView.setLayerType(View.LAYER_TYPE_NONE, null); |
| } |
| }); |
| anim.addUpdateListener(new AnimatorUpdateListener() { |
| public void onAnimationUpdate(ValueAnimator animation) { |
| updateAlphaFromOffset(animView, canAnimViewBeDismissed); |
| } |
| }); |
| anim.start(); |
| } |
| |
| public void snapChild(final View view, float velocity) { |
| final View animView = mCallback.getChildContentView(view); |
| final boolean canAnimViewBeDismissed = mCallback.canChildBeDismissed(animView); |
| ObjectAnimator anim = createTranslationAnimation(animView, 0); |
| int duration = SNAP_ANIM_LEN; |
| anim.setDuration(duration); |
| anim.addUpdateListener(new AnimatorUpdateListener() { |
| public void onAnimationUpdate(ValueAnimator animation) { |
| updateAlphaFromOffset(animView, canAnimViewBeDismissed); |
| } |
| }); |
| anim.addListener(new AnimatorListenerAdapter() { |
| public void onAnimationEnd(Animator animator) { |
| updateAlphaFromOffset(animView, canAnimViewBeDismissed); |
| } |
| }); |
| anim.start(); |
| } |
| |
| public boolean onTouchEvent(MotionEvent ev) { |
| if (mLongPressSent) { |
| return true; |
| } |
| |
| if (!mDragging) { |
| // We are not doing anything, make sure the long press callback |
| // is not still ticking like a bomb waiting to go off. |
| removeLongPressCallback(); |
| return false; |
| } |
| |
| mVelocityTracker.addMovement(ev); |
| final int action = ev.getAction(); |
| switch (action) { |
| case MotionEvent.ACTION_OUTSIDE: |
| case MotionEvent.ACTION_MOVE: |
| if (mCurrView != null) { |
| float delta = getPos(ev) - mInitialTouchPos; |
| // don't let items that can't be dismissed be dragged more than |
| // maxScrollDistance |
| if (CONSTRAIN_SWIPE && !mCallback.canChildBeDismissed(mCurrView)) { |
| float size = getSize(mCurrAnimView); |
| float maxScrollDistance = 0.15f * size; |
| if (Math.abs(delta) >= size) { |
| delta = delta > 0 ? maxScrollDistance : -maxScrollDistance; |
| } else { |
| delta = maxScrollDistance * (float) Math.sin((delta/size)*(Math.PI/2)); |
| } |
| } |
| setTranslation(mCurrAnimView, delta); |
| |
| updateAlphaFromOffset(mCurrAnimView, mCanCurrViewBeDimissed); |
| } |
| break; |
| case MotionEvent.ACTION_UP: |
| case MotionEvent.ACTION_CANCEL: |
| if (mCurrView != null) { |
| float maxVelocity = MAX_DISMISS_VELOCITY * mDensityScale; |
| mVelocityTracker.computeCurrentVelocity(1000 /* px/sec */, maxVelocity); |
| float escapeVelocity = SWIPE_ESCAPE_VELOCITY * mDensityScale; |
| float velocity = getVelocity(mVelocityTracker); |
| float perpendicularVelocity = getPerpendicularVelocity(mVelocityTracker); |
| |
| // Decide whether to dismiss the current view |
| boolean childSwipedFarEnough = DISMISS_IF_SWIPED_FAR_ENOUGH && |
| Math.abs(getTranslation(mCurrAnimView)) > 0.4 * getSize(mCurrAnimView); |
| boolean childSwipedFastEnough = (Math.abs(velocity) > escapeVelocity) && |
| (Math.abs(velocity) > Math.abs(perpendicularVelocity)) && |
| (velocity > 0) == (getTranslation(mCurrAnimView) > 0); |
| |
| boolean dismissChild = mCallback.canChildBeDismissed(mCurrView) && |
| (childSwipedFastEnough || childSwipedFarEnough); |
| |
| if (dismissChild) { |
| // flingadingy |
| dismissChild(mCurrView, childSwipedFastEnough ? velocity : 0f); |
| } else { |
| // snappity |
| mCallback.onDragCancelled(mCurrView); |
| snapChild(mCurrView, velocity); |
| } |
| } |
| break; |
| } |
| return true; |
| } |
| |
| public interface Callback { |
| View getChildAtPosition(MotionEvent ev); |
| |
| View getChildContentView(View v); |
| |
| boolean canChildBeDismissed(View v); |
| |
| void onBeginDrag(View v); |
| |
| void onChildDismissed(View v); |
| |
| void onDragCancelled(View v); |
| } |
| } |