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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 
     29 import java.util.List;
     30 import java.util.WeakHashMap;
     31 
     32 /**
     33  * A state of a {@link com.android.systemui.statusbar.stack.NotificationStackScrollLayout} which
     34  * can be applied to a viewGroup.
     35  */
     36 public class StackScrollState {
     37 
     38     private static final String CHILD_NOT_FOUND_TAG = "StackScrollStateNoSuchChild";
     39 
     40     private final ViewGroup mHostView;
     41     private WeakHashMap<ExpandableView, StackViewState> mStateMap;
     42     private final int mClearAllTopPadding;
     43 
     44     public StackScrollState(ViewGroup hostView) {
     45         mHostView = hostView;
     46         mStateMap = new WeakHashMap<>();
     47         mClearAllTopPadding = hostView.getContext().getResources().getDimensionPixelSize(
     48                 R.dimen.clear_all_padding_top);
     49     }
     50 
     51     public ViewGroup getHostView() {
     52         return mHostView;
     53     }
     54 
     55     public void resetViewStates() {
     56         int numChildren = mHostView.getChildCount();
     57         for (int i = 0; i < numChildren; i++) {
     58             ExpandableView child = (ExpandableView) mHostView.getChildAt(i);
     59             resetViewState(child);
     60 
     61             // handling reset for child notifications
     62             if (child instanceof ExpandableNotificationRow) {
     63                 ExpandableNotificationRow row = (ExpandableNotificationRow) child;
     64                 List<ExpandableNotificationRow> children =
     65                         row.getNotificationChildren();
     66                 if (row.isSummaryWithChildren() && children != null) {
     67                     for (ExpandableNotificationRow childRow : children) {
     68                         resetViewState(childRow);
     69                     }
     70                 }
     71             }
     72         }
     73     }
     74 
     75     private void resetViewState(ExpandableView view) {
     76         StackViewState viewState = mStateMap.get(view);
     77         if (viewState == null) {
     78             viewState = new StackViewState();
     79             mStateMap.put(view, viewState);
     80         }
     81         // initialize with the default values of the view
     82         viewState.height = view.getIntrinsicHeight();
     83         viewState.gone = view.getVisibility() == View.GONE;
     84         viewState.alpha = 1f;
     85         viewState.shadowAlpha = 1f;
     86         viewState.notGoneIndex = -1;
     87         viewState.hidden = false;
     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 DismissView) {
    111                 DismissView dismissView = (DismissView) child;
    112                 boolean visible = state.clipTopAmount < mClearAllTopPadding;
    113                 dismissView.performVisibilityAnimation(visible && !dismissView.willBeGone());
    114             } else if (child instanceof EmptyShadeView) {
    115                 EmptyShadeView emptyShadeView = (EmptyShadeView) child;
    116                 boolean visible = state.clipTopAmount <= 0;
    117                 emptyShadeView.performVisibilityAnimation(
    118                         visible && !emptyShadeView.willBeGone());
    119             }
    120         }
    121     }
    122 
    123     /**
    124      * Applies a  {@link StackViewState} to an  {@link ExpandableView}.
    125      *
    126      * @return whether the state was applied correctly
    127      */
    128     public boolean applyState(ExpandableView view, StackViewState state) {
    129         if (state == null) {
    130             Log.wtf(CHILD_NOT_FOUND_TAG, "No child state was found when applying this state " +
    131                     "to the hostView");
    132             return false;
    133         }
    134         if (state.gone) {
    135             return false;
    136         }
    137         applyViewState(view, state);
    138 
    139         int height = view.getActualHeight();
    140         int newHeight = state.height;
    141 
    142         // apply height
    143         if (height != newHeight) {
    144             view.setActualHeight(newHeight, false /* notifyListeners */);
    145         }
    146 
    147         float shadowAlpha = view.getShadowAlpha();
    148         float newShadowAlpha = state.shadowAlpha;
    149 
    150         // apply shadowAlpha
    151         if (shadowAlpha != newShadowAlpha) {
    152             view.setShadowAlpha(newShadowAlpha);
    153         }
    154 
    155         // apply dimming
    156         view.setDimmed(state.dimmed, false /* animate */);
    157 
    158         // apply hiding sensitive
    159         view.setHideSensitive(
    160                 state.hideSensitive, false /* animated */, 0 /* delay */, 0 /* duration */);
    161 
    162         // apply speed bump state
    163         view.setBelowSpeedBump(state.belowSpeedBump);
    164 
    165         // apply dark
    166         view.setDark(state.dark, false /* animate */, 0 /* delay */);
    167 
    168         // apply clipping
    169         float oldClipTopAmount = view.getClipTopAmount();
    170         if (oldClipTopAmount != state.clipTopAmount) {
    171             view.setClipTopAmount(state.clipTopAmount);
    172         }
    173         if (view instanceof ExpandableNotificationRow) {
    174             ExpandableNotificationRow row = (ExpandableNotificationRow) view;
    175             if (state.isBottomClipped) {
    176                 row.setClipToActualHeight(true);
    177             }
    178             row.applyChildrenState(this);
    179         }
    180         return true;
    181     }
    182 
    183     /**
    184      * Applies a  {@link ViewState} to a normal view.
    185      */
    186     public void applyViewState(View view, ViewState state) {
    187         float alpha = view.getAlpha();
    188         float yTranslation = view.getTranslationY();
    189         float xTranslation = view.getTranslationX();
    190         float zTranslation = view.getTranslationZ();
    191         float newAlpha = state.alpha;
    192         float newYTranslation = state.yTranslation;
    193         float newZTranslation = state.zTranslation;
    194         boolean becomesInvisible = newAlpha == 0.0f || state.hidden;
    195         if (alpha != newAlpha && xTranslation == 0) {
    196             // apply layer type
    197             boolean becomesFullyVisible = newAlpha == 1.0f;
    198             boolean newLayerTypeIsHardware = !becomesInvisible && !becomesFullyVisible
    199                     && view.hasOverlappingRendering();
    200             int layerType = view.getLayerType();
    201             int newLayerType = newLayerTypeIsHardware
    202                     ? View.LAYER_TYPE_HARDWARE
    203                     : View.LAYER_TYPE_NONE;
    204             if (layerType != newLayerType) {
    205                 view.setLayerType(newLayerType, null);
    206             }
    207 
    208             // apply alpha
    209             view.setAlpha(newAlpha);
    210         }
    211 
    212         // apply visibility
    213         int oldVisibility = view.getVisibility();
    214         int newVisibility = becomesInvisible ? View.INVISIBLE : View.VISIBLE;
    215         if (newVisibility != oldVisibility) {
    216             if (!(view instanceof ExpandableView) || !((ExpandableView) view).willBeGone()) {
    217                 // We don't want views to change visibility when they are animating to GONE
    218                 view.setVisibility(newVisibility);
    219             }
    220         }
    221 
    222         // apply yTranslation
    223         if (yTranslation != newYTranslation) {
    224             view.setTranslationY(newYTranslation);
    225         }
    226 
    227         // apply zTranslation
    228         if (zTranslation != newZTranslation) {
    229             view.setTranslationZ(newZTranslation);
    230         }
    231     }
    232 }
    233