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      1 /*
      2  * Copyright (C) 2014 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License
     15  */
     16 
     17 package com.android.systemui.statusbar.stack;
     18 
     19 import android.util.Log;
     20 import android.view.View;
     21 import android.view.ViewGroup;
     22 
     23 import com.android.systemui.R;
     24 import com.android.systemui.statusbar.DismissView;
     25 import com.android.systemui.statusbar.EmptyShadeView;
     26 import com.android.systemui.statusbar.ExpandableNotificationRow;
     27 import com.android.systemui.statusbar.ExpandableView;
     28 import com.android.systemui.statusbar.SpeedBumpView;
     29 
     30 import java.util.HashMap;
     31 import java.util.List;
     32 import java.util.Map;
     33 
     34 /**
     35  * A state of a {@link com.android.systemui.statusbar.stack.NotificationStackScrollLayout} which
     36  * can be applied to a viewGroup.
     37  */
     38 public class StackScrollState {
     39 
     40     private static final String CHILD_NOT_FOUND_TAG = "StackScrollStateNoSuchChild";
     41 
     42     private final ViewGroup mHostView;
     43     private Map<ExpandableView, StackViewState> mStateMap;
     44     private final int mClearAllTopPadding;
     45 
     46     public StackScrollState(ViewGroup hostView) {
     47         mHostView = hostView;
     48         mStateMap = new HashMap<ExpandableView, StackViewState>();
     49         mClearAllTopPadding = hostView.getContext().getResources().getDimensionPixelSize(
     50                 R.dimen.clear_all_padding_top);
     51     }
     52 
     53     public ViewGroup getHostView() {
     54         return mHostView;
     55     }
     56 
     57     public void resetViewStates() {
     58         int numChildren = mHostView.getChildCount();
     59         for (int i = 0; i < numChildren; i++) {
     60             ExpandableView child = (ExpandableView) mHostView.getChildAt(i);
     61             resetViewState(child);
     62 
     63             // handling reset for child notifications
     64             if (child instanceof ExpandableNotificationRow) {
     65                 ExpandableNotificationRow row = (ExpandableNotificationRow) child;
     66                 List<ExpandableNotificationRow> children =
     67                         row.getNotificationChildren();
     68                 if (row.areChildrenExpanded() && children != null) {
     69                     for (ExpandableNotificationRow childRow : children) {
     70                         resetViewState(childRow);
     71                     }
     72                 }
     73             }
     74         }
     75     }
     76 
     77     private void resetViewState(ExpandableView view) {
     78         StackViewState viewState = mStateMap.get(view);
     79         if (viewState == null) {
     80             viewState = new StackViewState();
     81             mStateMap.put(view, viewState);
     82         }
     83         // initialize with the default values of the view
     84         viewState.height = view.getIntrinsicHeight();
     85         viewState.gone = view.getVisibility() == View.GONE;
     86         viewState.alpha = 1;
     87         viewState.notGoneIndex = -1;
     88     }
     89 
     90     public StackViewState getViewStateForView(View requestedView) {
     91         return mStateMap.get(requestedView);
     92     }
     93 
     94     public void removeViewStateForView(View child) {
     95         mStateMap.remove(child);
     96     }
     97 
     98     /**
     99      * Apply the properties saved in {@link #mStateMap} to the children of the {@link #mHostView}.
    100      * The properties are only applied if they effectively changed.
    101      */
    102     public void apply() {
    103         int numChildren = mHostView.getChildCount();
    104         for (int i = 0; i < numChildren; i++) {
    105             ExpandableView child = (ExpandableView) mHostView.getChildAt(i);
    106             StackViewState state = mStateMap.get(child);
    107             if (!applyState(child, state)) {
    108                 continue;
    109             }
    110             if(child instanceof SpeedBumpView) {
    111                 performSpeedBumpAnimation(i, (SpeedBumpView) child, state, 0);
    112             } else if (child instanceof DismissView) {
    113                 DismissView dismissView = (DismissView) child;
    114                 boolean visible = state.topOverLap < mClearAllTopPadding;
    115                 dismissView.performVisibilityAnimation(visible && !dismissView.willBeGone());
    116             } else if (child instanceof EmptyShadeView) {
    117                 EmptyShadeView emptyShadeView = (EmptyShadeView) child;
    118                 boolean visible = state.topOverLap <= 0;
    119                 emptyShadeView.performVisibilityAnimation(
    120                         visible && !emptyShadeView.willBeGone());
    121             }
    122         }
    123     }
    124 
    125     /**
    126      * Applies a  {@link StackViewState} to an  {@link ExpandableView}.
    127      *
    128      * @return whether the state was applied correctly
    129      */
    130     public boolean applyState(ExpandableView view, StackViewState state) {
    131         if (state == null) {
    132             Log.wtf(CHILD_NOT_FOUND_TAG, "No child state was found when applying this state " +
    133                     "to the hostView");
    134             return false;
    135         }
    136         if (state.gone) {
    137             return false;
    138         }
    139         applyViewState(view, state);
    140 
    141         int height = view.getActualHeight();
    142         int newHeight = state.height;
    143 
    144         // apply height
    145         if (height != newHeight) {
    146             view.setActualHeight(newHeight, false /* notifyListeners */);
    147         }
    148 
    149         // apply dimming
    150         view.setDimmed(state.dimmed, false /* animate */);
    151 
    152         // apply hiding sensitive
    153         view.setHideSensitive(
    154                 state.hideSensitive, false /* animated */, 0 /* delay */, 0 /* duration */);
    155 
    156         // apply speed bump state
    157         view.setBelowSpeedBump(state.belowSpeedBump);
    158 
    159         // apply dark
    160         view.setDark(state.dark, false /* animate */, 0 /* delay */);
    161 
    162         // apply clipping
    163         float oldClipTopAmount = view.getClipTopAmount();
    164         if (oldClipTopAmount != state.clipTopAmount) {
    165             view.setClipTopAmount(state.clipTopAmount);
    166         }
    167         float oldClipTopOptimization = view.getClipTopOptimization();
    168         if (oldClipTopOptimization != state.topOverLap) {
    169             view.setClipTopOptimization(state.topOverLap);
    170         }
    171         if (view instanceof ExpandableNotificationRow) {
    172             ExpandableNotificationRow row = (ExpandableNotificationRow) view;
    173             row.applyChildrenState(this);
    174         }
    175         return true;
    176     }
    177 
    178     /**
    179      * Applies a  {@link ViewState} to a normal view.
    180      */
    181     public void applyViewState(View view, ViewState state) {
    182         float alpha = view.getAlpha();
    183         float yTranslation = view.getTranslationY();
    184         float xTranslation = view.getTranslationX();
    185         float zTranslation = view.getTranslationZ();
    186         float scale = view.getScaleX();
    187         float newAlpha = state.alpha;
    188         float newYTranslation = state.yTranslation;
    189         float newZTranslation = state.zTranslation;
    190         float newScale = state.scale;
    191         boolean becomesInvisible = newAlpha == 0.0f;
    192         if (alpha != newAlpha && xTranslation == 0) {
    193             // apply layer type
    194             boolean becomesFullyVisible = newAlpha == 1.0f;
    195             boolean newLayerTypeIsHardware = !becomesInvisible && !becomesFullyVisible
    196                     && view.hasOverlappingRendering();
    197             int layerType = view.getLayerType();
    198             int newLayerType = newLayerTypeIsHardware
    199                     ? View.LAYER_TYPE_HARDWARE
    200                     : View.LAYER_TYPE_NONE;
    201             if (layerType != newLayerType) {
    202                 view.setLayerType(newLayerType, null);
    203             }
    204 
    205             // apply alpha
    206             view.setAlpha(newAlpha);
    207         }
    208 
    209         // apply visibility
    210         int oldVisibility = view.getVisibility();
    211         int newVisibility = becomesInvisible ? View.INVISIBLE : View.VISIBLE;
    212         if (newVisibility != oldVisibility) {
    213             if (!(view instanceof ExpandableView) || !((ExpandableView) view).willBeGone()) {
    214                 // We don't want views to change visibility when they are animating to GONE
    215                 view.setVisibility(newVisibility);
    216             }
    217         }
    218 
    219         // apply yTranslation
    220         if (yTranslation != newYTranslation) {
    221             view.setTranslationY(newYTranslation);
    222         }
    223 
    224         // apply zTranslation
    225         if (zTranslation != newZTranslation) {
    226             view.setTranslationZ(newZTranslation);
    227         }
    228 
    229         // apply scale
    230         if (scale != newScale) {
    231             view.setScaleX(newScale);
    232             view.setScaleY(newScale);
    233         }
    234     }
    235 
    236     public void performSpeedBumpAnimation(int i, SpeedBumpView speedBump, StackViewState state,
    237             long delay) {
    238         View nextChild = getNextChildNotGone(i);
    239         if (nextChild != null) {
    240             float lineEnd = state.yTranslation + state.height / 2;
    241             StackViewState nextState = getViewStateForView(nextChild);
    242             boolean startIsAboveNext = nextState.yTranslation > lineEnd;
    243             speedBump.animateDivider(startIsAboveNext, delay, null /* onFinishedRunnable */);
    244         }
    245     }
    246 
    247     private View getNextChildNotGone(int childIndex) {
    248         int childCount = mHostView.getChildCount();
    249         for (int i = childIndex + 1; i < childCount; i++) {
    250             View child = mHostView.getChildAt(i);
    251             if (child.getVisibility() != View.GONE) {
    252                 return child;
    253             }
    254         }
    255         return null;
    256     }
    257 
    258 }
    259