| /* |
| * Copyright (C) 2014 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.statusbar; |
| |
| import android.animation.Animator; |
| import android.animation.AnimatorListenerAdapter; |
| import android.animation.ObjectAnimator; |
| import android.animation.ValueAnimator; |
| import android.content.Context; |
| import android.view.MotionEvent; |
| import android.view.View; |
| import android.view.ViewConfiguration; |
| |
| import com.android.systemui.ExpandHelper; |
| import com.android.systemui.Gefingerpoken; |
| import com.android.systemui.Interpolators; |
| import com.android.systemui.R; |
| import com.android.systemui.classifier.FalsingManager; |
| |
| /** |
| * A utility class to enable the downward swipe on the lockscreen to go to the full shade and expand |
| * the notification where the drag started. |
| */ |
| public class DragDownHelper implements Gefingerpoken { |
| |
| private static final float RUBBERBAND_FACTOR_EXPANDABLE = 0.5f; |
| private static final float RUBBERBAND_FACTOR_STATIC = 0.15f; |
| |
| private static final int SPRING_BACK_ANIMATION_LENGTH_MS = 375; |
| |
| private int mMinDragDistance; |
| private ExpandHelper.Callback mCallback; |
| private float mInitialTouchX; |
| private float mInitialTouchY; |
| private boolean mDraggingDown; |
| private float mTouchSlop; |
| private DragDownCallback mDragDownCallback; |
| private View mHost; |
| private final int[] mTemp2 = new int[2]; |
| private boolean mDraggedFarEnough; |
| private ExpandableView mStartingChild; |
| private float mLastHeight; |
| private FalsingManager mFalsingManager; |
| |
| public DragDownHelper(Context context, View host, ExpandHelper.Callback callback, |
| DragDownCallback dragDownCallback) { |
| mMinDragDistance = context.getResources().getDimensionPixelSize( |
| R.dimen.keyguard_drag_down_min_distance); |
| mTouchSlop = ViewConfiguration.get(context).getScaledTouchSlop(); |
| mCallback = callback; |
| mDragDownCallback = dragDownCallback; |
| mHost = host; |
| mFalsingManager = FalsingManager.getInstance(context); |
| } |
| |
| @Override |
| public boolean onInterceptTouchEvent(MotionEvent event) { |
| final float x = event.getX(); |
| final float y = event.getY(); |
| |
| switch (event.getActionMasked()) { |
| case MotionEvent.ACTION_DOWN: |
| mDraggedFarEnough = false; |
| mDraggingDown = false; |
| mStartingChild = null; |
| mInitialTouchY = y; |
| mInitialTouchX = x; |
| break; |
| |
| case MotionEvent.ACTION_MOVE: |
| final float h = y - mInitialTouchY; |
| if (h > mTouchSlop && h > Math.abs(x - mInitialTouchX)) { |
| mFalsingManager.onNotificatonStartDraggingDown(); |
| mDraggingDown = true; |
| captureStartingChild(mInitialTouchX, mInitialTouchY); |
| mInitialTouchY = y; |
| mInitialTouchX = x; |
| mDragDownCallback.onTouchSlopExceeded(); |
| return true; |
| } |
| break; |
| } |
| return false; |
| } |
| |
| @Override |
| public boolean onTouchEvent(MotionEvent event) { |
| if (!mDraggingDown) { |
| return false; |
| } |
| final float x = event.getX(); |
| final float y = event.getY(); |
| |
| switch (event.getActionMasked()) { |
| case MotionEvent.ACTION_MOVE: |
| mLastHeight = y - mInitialTouchY; |
| captureStartingChild(mInitialTouchX, mInitialTouchY); |
| if (mStartingChild != null) { |
| handleExpansion(mLastHeight, mStartingChild); |
| } else { |
| mDragDownCallback.setEmptyDragAmount(mLastHeight); |
| } |
| if (mLastHeight > mMinDragDistance) { |
| if (!mDraggedFarEnough) { |
| mDraggedFarEnough = true; |
| mDragDownCallback.onCrossedThreshold(true); |
| } |
| } else { |
| if (mDraggedFarEnough) { |
| mDraggedFarEnough = false; |
| mDragDownCallback.onCrossedThreshold(false); |
| } |
| } |
| return true; |
| case MotionEvent.ACTION_UP: |
| if (!isFalseTouch() && mDragDownCallback.onDraggedDown(mStartingChild, |
| (int) (y - mInitialTouchY))) { |
| if (mStartingChild == null) { |
| mDragDownCallback.setEmptyDragAmount(0f); |
| } else { |
| mCallback.setUserLockedChild(mStartingChild, false); |
| } |
| mDraggingDown = false; |
| } else { |
| stopDragging(); |
| return false; |
| } |
| break; |
| case MotionEvent.ACTION_CANCEL: |
| stopDragging(); |
| return false; |
| } |
| return false; |
| } |
| |
| private boolean isFalseTouch() { |
| return mFalsingManager.isFalseTouch() || !mDraggedFarEnough; |
| } |
| |
| private void captureStartingChild(float x, float y) { |
| if (mStartingChild == null) { |
| mStartingChild = findView(x, y); |
| if (mStartingChild != null) { |
| mCallback.setUserLockedChild(mStartingChild, true); |
| } |
| } |
| } |
| |
| private void handleExpansion(float heightDelta, ExpandableView child) { |
| if (heightDelta < 0) { |
| heightDelta = 0; |
| } |
| boolean expandable = child.isContentExpandable(); |
| float rubberbandFactor = expandable |
| ? RUBBERBAND_FACTOR_EXPANDABLE |
| : RUBBERBAND_FACTOR_STATIC; |
| float rubberband = heightDelta * rubberbandFactor; |
| if (expandable |
| && (rubberband + child.getCollapsedHeight()) > child.getMaxContentHeight()) { |
| float overshoot = |
| (rubberband + child.getCollapsedHeight()) - child.getMaxContentHeight(); |
| overshoot *= (1 - RUBBERBAND_FACTOR_STATIC); |
| rubberband -= overshoot; |
| } |
| child.setActualHeight((int) (child.getCollapsedHeight() + rubberband)); |
| } |
| |
| private void cancelExpansion(final ExpandableView child) { |
| if (child.getActualHeight() == child.getCollapsedHeight()) { |
| mCallback.setUserLockedChild(child, false); |
| return; |
| } |
| ObjectAnimator anim = ObjectAnimator.ofInt(child, "actualHeight", |
| child.getActualHeight(), child.getCollapsedHeight()); |
| anim.setInterpolator(Interpolators.FAST_OUT_SLOW_IN); |
| anim.setDuration(SPRING_BACK_ANIMATION_LENGTH_MS); |
| anim.addListener(new AnimatorListenerAdapter() { |
| @Override |
| public void onAnimationEnd(Animator animation) { |
| mCallback.setUserLockedChild(child, false); |
| } |
| }); |
| anim.start(); |
| } |
| |
| private void cancelExpansion() { |
| ValueAnimator anim = ValueAnimator.ofFloat(mLastHeight, 0); |
| anim.setInterpolator(Interpolators.FAST_OUT_SLOW_IN); |
| anim.setDuration(SPRING_BACK_ANIMATION_LENGTH_MS); |
| anim.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() { |
| @Override |
| public void onAnimationUpdate(ValueAnimator animation) { |
| mDragDownCallback.setEmptyDragAmount((Float) animation.getAnimatedValue()); |
| } |
| }); |
| anim.start(); |
| } |
| |
| private void stopDragging() { |
| mFalsingManager.onNotificatonStopDraggingDown(); |
| if (mStartingChild != null) { |
| cancelExpansion(mStartingChild); |
| } else { |
| cancelExpansion(); |
| } |
| mDraggingDown = false; |
| mDragDownCallback.onDragDownReset(); |
| } |
| |
| private ExpandableView findView(float x, float y) { |
| mHost.getLocationOnScreen(mTemp2); |
| x += mTemp2[0]; |
| y += mTemp2[1]; |
| return mCallback.getChildAtRawPosition(x, y); |
| } |
| |
| public boolean isDraggingDown() { |
| return mDraggingDown; |
| } |
| |
| public interface DragDownCallback { |
| |
| /** |
| * @return true if the interaction is accepted, false if it should be cancelled |
| */ |
| boolean onDraggedDown(View startingChild, int dragLengthY); |
| void onDragDownReset(); |
| |
| /** |
| * The user has dragged either above or below the threshold |
| * @param above whether he dragged above it |
| */ |
| void onCrossedThreshold(boolean above); |
| void onTouchSlopExceeded(); |
| void setEmptyDragAmount(float amount); |
| } |
| } |