/* * 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.stack; import android.content.Context; import android.content.res.Resources; import android.util.Log; import android.view.View; import android.view.ViewGroup; import com.android.systemui.R; import com.android.systemui.statusbar.DismissView; import com.android.systemui.statusbar.EmptyShadeView; import com.android.systemui.statusbar.ExpandableNotificationRow; import com.android.systemui.statusbar.ExpandableView; import com.android.systemui.statusbar.NotificationShelf; import com.android.systemui.statusbar.notification.NotificationUtils; import java.util.ArrayList; import java.util.HashMap; import java.util.List; /** * The Algorithm of the {@link com.android.systemui.statusbar.stack * .NotificationStackScrollLayout} which can be queried for {@link com.android.systemui.statusbar * .stack.StackScrollState} */ public class StackScrollAlgorithm { private static final String LOG_TAG = "StackScrollAlgorithm"; private int mPaddingBetweenElements; private int mIncreasedPaddingBetweenElements; private int mCollapsedSize; private StackScrollAlgorithmState mTempAlgorithmState = new StackScrollAlgorithmState(); private boolean mIsExpanded; private boolean mClipNotificationScrollToTop; private int mStatusBarHeight; public StackScrollAlgorithm(Context context) { initView(context); } public void initView(Context context) { initConstants(context); } private void initConstants(Context context) { Resources res = context.getResources(); mPaddingBetweenElements = res.getDimensionPixelSize( R.dimen.notification_divider_height); mIncreasedPaddingBetweenElements = res.getDimensionPixelSize(R.dimen.notification_divider_height_increased); mCollapsedSize = res.getDimensionPixelSize(R.dimen.notification_min_height); mStatusBarHeight = res.getDimensionPixelSize(R.dimen.status_bar_height); mClipNotificationScrollToTop = res.getBoolean(R.bool.config_clipNotificationScrollToTop); } public void getStackScrollState(AmbientState ambientState, StackScrollState resultState) { // The state of the local variables are saved in an algorithmState to easily subdivide it // into multiple phases. StackScrollAlgorithmState algorithmState = mTempAlgorithmState; // First we reset the view states to their default values. resultState.resetViewStates(); initAlgorithmState(resultState, algorithmState, ambientState); updatePositionsForState(resultState, algorithmState, ambientState); updateZValuesForState(resultState, algorithmState, ambientState); updateHeadsUpStates(resultState, algorithmState, ambientState); handleDraggedViews(ambientState, resultState, algorithmState); updateDimmedActivatedHideSensitive(ambientState, resultState, algorithmState); updateClipping(resultState, algorithmState, ambientState); updateSpeedBumpState(resultState, algorithmState, ambientState); updateShelfState(resultState, ambientState); getNotificationChildrenStates(resultState, algorithmState); } private void getNotificationChildrenStates(StackScrollState resultState, StackScrollAlgorithmState algorithmState) { int childCount = algorithmState.visibleChildren.size(); for (int i = 0; i < childCount; i++) { ExpandableView v = algorithmState.visibleChildren.get(i); if (v instanceof ExpandableNotificationRow) { ExpandableNotificationRow row = (ExpandableNotificationRow) v; row.getChildrenStates(resultState); } } } private void updateSpeedBumpState(StackScrollState resultState, StackScrollAlgorithmState algorithmState, AmbientState ambientState) { int childCount = algorithmState.visibleChildren.size(); int belowSpeedBump = ambientState.getSpeedBumpIndex(); for (int i = 0; i < childCount; i++) { View child = algorithmState.visibleChildren.get(i); ExpandableViewState childViewState = resultState.getViewStateForView(child); // The speed bump can also be gone, so equality needs to be taken when comparing // indices. childViewState.belowSpeedBump = i >= belowSpeedBump; } } private void updateShelfState(StackScrollState resultState, AmbientState ambientState) { NotificationShelf shelf = ambientState.getShelf(); shelf.updateState(resultState, ambientState); } private void updateClipping(StackScrollState resultState, StackScrollAlgorithmState algorithmState, AmbientState ambientState) { float drawStart = !ambientState.isOnKeyguard() ? ambientState.getTopPadding() + ambientState.getStackTranslation() : 0; float previousNotificationEnd = 0; float previousNotificationStart = 0; int childCount = algorithmState.visibleChildren.size(); for (int i = 0; i < childCount; i++) { ExpandableView child = algorithmState.visibleChildren.get(i); ExpandableViewState state = resultState.getViewStateForView(child); if (!child.mustStayOnScreen()) { previousNotificationEnd = Math.max(drawStart, previousNotificationEnd); previousNotificationStart = Math.max(drawStart, previousNotificationStart); } float newYTranslation = state.yTranslation; float newHeight = state.height; float newNotificationEnd = newYTranslation + newHeight; boolean isHeadsUp = (child instanceof ExpandableNotificationRow) && ((ExpandableNotificationRow) child).isPinned(); if (mClipNotificationScrollToTop && !state.inShelf && newYTranslation < previousNotificationEnd && (!isHeadsUp || ambientState.isShadeExpanded())) { // The previous view is overlapping on top, clip! float overlapAmount = previousNotificationEnd - newYTranslation; state.clipTopAmount = (int) overlapAmount; } else { state.clipTopAmount = 0; } if (!child.isTransparent()) { // Only update the previous values if we are not transparent, // otherwise we would clip to a transparent view. previousNotificationEnd = newNotificationEnd; previousNotificationStart = newYTranslation; } } } public static boolean canChildBeDismissed(View v) { if (!(v instanceof ExpandableNotificationRow)) { return false; } ExpandableNotificationRow row = (ExpandableNotificationRow) v; if (row.areGutsExposed()) { return false; } return row.canViewBeDismissed(); } /** * Updates the dimmed, activated and hiding sensitive states of the children. */ private void updateDimmedActivatedHideSensitive(AmbientState ambientState, StackScrollState resultState, StackScrollAlgorithmState algorithmState) { boolean dimmed = ambientState.isDimmed(); boolean dark = ambientState.isDark(); boolean hideSensitive = ambientState.isHideSensitive(); View activatedChild = ambientState.getActivatedChild(); int childCount = algorithmState.visibleChildren.size(); for (int i = 0; i < childCount; i++) { View child = algorithmState.visibleChildren.get(i); ExpandableViewState childViewState = resultState.getViewStateForView(child); childViewState.dimmed = dimmed; childViewState.dark = dark; childViewState.hideSensitive = hideSensitive; boolean isActivatedChild = activatedChild == child; if (dimmed && isActivatedChild) { childViewState.zTranslation += 2.0f * ambientState.getZDistanceBetweenElements(); } } } /** * Handle the special state when views are being dragged */ private void handleDraggedViews(AmbientState ambientState, StackScrollState resultState, StackScrollAlgorithmState algorithmState) { ArrayList draggedViews = ambientState.getDraggedViews(); for (View draggedView : draggedViews) { int childIndex = algorithmState.visibleChildren.indexOf(draggedView); if (childIndex >= 0 && childIndex < algorithmState.visibleChildren.size() - 1) { View nextChild = algorithmState.visibleChildren.get(childIndex + 1); if (!draggedViews.contains(nextChild)) { // only if the view is not dragged itself we modify its state to be fully // visible ExpandableViewState viewState = resultState.getViewStateForView( nextChild); // The child below the dragged one must be fully visible if (ambientState.isShadeExpanded()) { viewState.shadowAlpha = 1; viewState.hidden = false; } } // Lets set the alpha to the one it currently has, as its currently being dragged ExpandableViewState viewState = resultState.getViewStateForView(draggedView); // The dragged child should keep the set alpha viewState.alpha = draggedView.getAlpha(); } } } /** * Initialize the algorithm state like updating the visible children. */ private void initAlgorithmState(StackScrollState resultState, StackScrollAlgorithmState state, AmbientState ambientState) { float bottomOverScroll = ambientState.getOverScrollAmount(false /* onTop */); int scrollY = ambientState.getScrollY(); // Due to the overScroller, the stackscroller can have negative scroll state. This is // already accounted for by the top padding and doesn't need an additional adaption scrollY = Math.max(0, scrollY); state.scrollY = (int) (scrollY + bottomOverScroll); //now init the visible children and update paddings ViewGroup hostView = resultState.getHostView(); int childCount = hostView.getChildCount(); state.visibleChildren.clear(); state.visibleChildren.ensureCapacity(childCount); state.paddingMap.clear(); int notGoneIndex = 0; ExpandableView lastView = null; int firstHiddenIndex = ambientState.isDark() ? (ambientState.hasPulsingNotifications() ? 1 : 0) : childCount; // The goal here is to fill the padding map, by iterating over how much padding each child // needs. The map is thereby reused, by first filling it with the padding amount and when // iterating over it again, it's filled with the actual resolved value. for (int i = 0; i < childCount; i++) { ExpandableView v = (ExpandableView) hostView.getChildAt(i); if (v.getVisibility() != View.GONE) { if (v == ambientState.getShelf()) { continue; } if (i >= firstHiddenIndex) { // we need normal padding now, to be in sync with what the stack calculates lastView = null; ExpandableViewState viewState = resultState.getViewStateForView(v); viewState.hidden = true; } notGoneIndex = updateNotGoneIndex(resultState, state, notGoneIndex, v); float increasedPadding = v.getIncreasedPaddingAmount(); if (increasedPadding != 0.0f) { state.paddingMap.put(v, increasedPadding); if (lastView != null) { Float prevValue = state.paddingMap.get(lastView); float newValue = getPaddingForValue(increasedPadding); if (prevValue != null) { float prevPadding = getPaddingForValue(prevValue); if (increasedPadding > 0) { newValue = NotificationUtils.interpolate( prevPadding, newValue, increasedPadding); } else if (prevValue > 0) { newValue = NotificationUtils.interpolate( newValue, prevPadding, prevValue); } } state.paddingMap.put(lastView, newValue); } } else if (lastView != null) { // Let's now resolve the value to an actual padding float newValue = getPaddingForValue(state.paddingMap.get(lastView)); state.paddingMap.put(lastView, newValue); } if (v instanceof ExpandableNotificationRow) { ExpandableNotificationRow row = (ExpandableNotificationRow) v; // handle the notgoneIndex for the children as well List children = row.getNotificationChildren(); if (row.isSummaryWithChildren() && children != null) { for (ExpandableNotificationRow childRow : children) { if (childRow.getVisibility() != View.GONE) { ExpandableViewState childState = resultState.getViewStateForView(childRow); childState.notGoneIndex = notGoneIndex; notGoneIndex++; } } } } lastView = v; } } } private float getPaddingForValue(Float increasedPadding) { if (increasedPadding == null) { return mPaddingBetweenElements; } else if (increasedPadding >= 0.0f) { return NotificationUtils.interpolate( mPaddingBetweenElements, mIncreasedPaddingBetweenElements, increasedPadding); } else { return NotificationUtils.interpolate( 0, mPaddingBetweenElements, 1.0f + increasedPadding); } } private int updateNotGoneIndex(StackScrollState resultState, StackScrollAlgorithmState state, int notGoneIndex, ExpandableView v) { ExpandableViewState viewState = resultState.getViewStateForView(v); viewState.notGoneIndex = notGoneIndex; state.visibleChildren.add(v); notGoneIndex++; return notGoneIndex; } /** * Determine the positions for the views. This is the main part of the algorithm. * * @param resultState The result state to update if a change to the properties of a child occurs * @param algorithmState The state in which the current pass of the algorithm is currently in * @param ambientState The current ambient state */ private void updatePositionsForState(StackScrollState resultState, StackScrollAlgorithmState algorithmState, AmbientState ambientState) { // The y coordinate of the current child. float currentYPosition = -algorithmState.scrollY; int childCount = algorithmState.visibleChildren.size(); for (int i = 0; i < childCount; i++) { currentYPosition = updateChild(i, resultState, algorithmState, ambientState, currentYPosition); } } protected float updateChild(int i, StackScrollState resultState, StackScrollAlgorithmState algorithmState, AmbientState ambientState, float currentYPosition) { ExpandableView child = algorithmState.visibleChildren.get(i); ExpandableViewState childViewState = resultState.getViewStateForView(child); childViewState.location = ExpandableViewState.LOCATION_UNKNOWN; int paddingAfterChild = getPaddingAfterChild(algorithmState, child); int childHeight = getMaxAllowedChildHeight(child); childViewState.yTranslation = currentYPosition; boolean isDismissView = child instanceof DismissView; boolean isEmptyShadeView = child instanceof EmptyShadeView; childViewState.location = ExpandableViewState.LOCATION_MAIN_AREA; if (isDismissView) { childViewState.yTranslation = Math.min(childViewState.yTranslation, ambientState.getInnerHeight() - childHeight); } else if (isEmptyShadeView) { childViewState.yTranslation = ambientState.getInnerHeight() - childHeight + ambientState.getStackTranslation() * 0.25f; } else { clampPositionToShelf(childViewState, ambientState); } currentYPosition = childViewState.yTranslation + childHeight + paddingAfterChild; if (currentYPosition <= 0) { childViewState.location = ExpandableViewState.LOCATION_HIDDEN_TOP; } if (childViewState.location == ExpandableViewState.LOCATION_UNKNOWN) { Log.wtf(LOG_TAG, "Failed to assign location for child " + i); } childViewState.yTranslation += ambientState.getTopPadding() + ambientState.getStackTranslation(); return currentYPosition; } protected int getPaddingAfterChild(StackScrollAlgorithmState algorithmState, ExpandableView child) { return algorithmState.getPaddingAfterChild(child); } private void updateHeadsUpStates(StackScrollState resultState, StackScrollAlgorithmState algorithmState, AmbientState ambientState) { int childCount = algorithmState.visibleChildren.size(); ExpandableNotificationRow topHeadsUpEntry = null; for (int i = 0; i < childCount; i++) { View child = algorithmState.visibleChildren.get(i); if (!(child instanceof ExpandableNotificationRow)) { break; } ExpandableNotificationRow row = (ExpandableNotificationRow) child; if (!row.isHeadsUp()) { break; } ExpandableViewState childState = resultState.getViewStateForView(row); if (topHeadsUpEntry == null) { topHeadsUpEntry = row; childState.location = ExpandableViewState.LOCATION_FIRST_HUN; } boolean isTopEntry = topHeadsUpEntry == row; float unmodifiedEndLocation = childState.yTranslation + childState.height; if (mIsExpanded) { // Ensure that the heads up is always visible even when scrolled off clampHunToTop(ambientState, row, childState); if (i == 0 && ambientState.isAboveShelf(row)) { // the first hun can't get off screen. clampHunToMaxTranslation(ambientState, row, childState); childState.hidden = false; } } if (row.isPinned()) { childState.yTranslation = Math.max(childState.yTranslation, 0); childState.height = Math.max(row.getIntrinsicHeight(), childState.height); childState.hidden = false; ExpandableViewState topState = resultState.getViewStateForView(topHeadsUpEntry); if (!isTopEntry && (!mIsExpanded || unmodifiedEndLocation < topState.yTranslation + topState.height)) { // Ensure that a headsUp doesn't vertically extend further than the heads-up at // the top most z-position childState.height = row.getIntrinsicHeight(); childState.yTranslation = topState.yTranslation + topState.height - childState.height; } } if (row.isHeadsUpAnimatingAway()) { childState.hidden = false; } } } private void clampHunToTop(AmbientState ambientState, ExpandableNotificationRow row, ExpandableViewState childState) { float newTranslation = Math.max(ambientState.getTopPadding() + ambientState.getStackTranslation(), childState.yTranslation); childState.height = (int) Math.max(childState.height - (newTranslation - childState.yTranslation), row.getCollapsedHeight()); childState.yTranslation = newTranslation; } private void clampHunToMaxTranslation(AmbientState ambientState, ExpandableNotificationRow row, ExpandableViewState childState) { float newTranslation; float maxHeadsUpTranslation = ambientState.getMaxHeadsUpTranslation(); float maxShelfPosition = ambientState.getInnerHeight() + ambientState.getTopPadding() + ambientState.getStackTranslation(); maxHeadsUpTranslation = Math.min(maxHeadsUpTranslation, maxShelfPosition); float bottomPosition = maxHeadsUpTranslation - row.getCollapsedHeight(); newTranslation = Math.min(childState.yTranslation, bottomPosition); childState.height = (int) Math.min(childState.height, maxHeadsUpTranslation - newTranslation); childState.yTranslation = newTranslation; } /** * Clamp the height of the child down such that its end is at most on the beginning of * the shelf. * * @param childViewState the view state of the child * @param ambientState the ambient state */ private void clampPositionToShelf(ExpandableViewState childViewState, AmbientState ambientState) { int shelfStart = ambientState.getInnerHeight() - ambientState.getShelf().getIntrinsicHeight(); childViewState.yTranslation = Math.min(childViewState.yTranslation, shelfStart); if (childViewState.yTranslation >= shelfStart) { childViewState.hidden = true; childViewState.inShelf = true; } if (!ambientState.isShadeExpanded()) { childViewState.height = (int) (mStatusBarHeight - childViewState.yTranslation); } } protected int getMaxAllowedChildHeight(View child) { if (child instanceof ExpandableView) { ExpandableView expandableView = (ExpandableView) child; return expandableView.getIntrinsicHeight(); } return child == null? mCollapsedSize : child.getHeight(); } /** * Calculate the Z positions for all children based on the number of items in both stacks and * save it in the resultState * @param resultState The result state to update the zTranslation values * @param algorithmState The state in which the current pass of the algorithm is currently in * @param ambientState The ambient state of the algorithm */ private void updateZValuesForState(StackScrollState resultState, StackScrollAlgorithmState algorithmState, AmbientState ambientState) { int childCount = algorithmState.visibleChildren.size(); float childrenOnTop = 0.0f; for (int i = childCount - 1; i >= 0; i--) { childrenOnTop = updateChildZValue(i, childrenOnTop, resultState, algorithmState, ambientState); } } protected float updateChildZValue(int i, float childrenOnTop, StackScrollState resultState, StackScrollAlgorithmState algorithmState, AmbientState ambientState) { ExpandableView child = algorithmState.visibleChildren.get(i); ExpandableViewState childViewState = resultState.getViewStateForView(child); int zDistanceBetweenElements = ambientState.getZDistanceBetweenElements(); float baseZ = ambientState.getBaseZHeight(); if (child.mustStayOnScreen() && !ambientState.isDozingAndNotPulsing(child) && childViewState.yTranslation < ambientState.getTopPadding() + ambientState.getStackTranslation()) { if (childrenOnTop != 0.0f) { childrenOnTop++; } else { float overlap = ambientState.getTopPadding() + ambientState.getStackTranslation() - childViewState.yTranslation; childrenOnTop += Math.min(1.0f, overlap / childViewState.height); } childViewState.zTranslation = baseZ + childrenOnTop * zDistanceBetweenElements; } else if (i == 0 && ambientState.isAboveShelf(child)) { // In case this is a new view that has never been measured before, we don't want to // elevate if we are currently expanded more then the notification int shelfHeight = ambientState.getShelf().getIntrinsicHeight(); float shelfStart = ambientState.getInnerHeight() - shelfHeight + ambientState.getTopPadding() + ambientState.getStackTranslation(); float notificationEnd = childViewState.yTranslation + child.getPinnedHeadsUpHeight() + mPaddingBetweenElements; if (shelfStart > notificationEnd) { childViewState.zTranslation = baseZ; } else { float factor = (notificationEnd - shelfStart) / shelfHeight; factor = Math.min(factor, 1.0f); childViewState.zTranslation = baseZ + factor * zDistanceBetweenElements; } } else { childViewState.zTranslation = baseZ; } return childrenOnTop; } public void setIsExpanded(boolean isExpanded) { this.mIsExpanded = isExpanded; } public class StackScrollAlgorithmState { /** * The scroll position of the algorithm */ public int scrollY; /** * The children from the host view which are not gone. */ public final ArrayList visibleChildren = new ArrayList(); /** * The padding after each child measured in pixels. */ public final HashMap paddingMap = new HashMap<>(); public int getPaddingAfterChild(ExpandableView child) { Float padding = paddingMap.get(child); if (padding == null) { // Should only happen for the last view return mPaddingBetweenElements; } return (int) padding.floatValue(); } } }