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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;
     18 
     19 import android.content.Context;
     20 import android.content.res.Resources;
     21 import android.graphics.Outline;
     22 import android.graphics.Rect;
     23 import android.graphics.RectF;
     24 import android.util.AttributeSet;
     25 import android.view.View;
     26 import android.view.ViewOutlineProvider;
     27 import com.android.systemui.R;
     28 
     29 /**
     30  * Like {@link ExpandableView}, but setting an outline for the height and clipping.
     31  */
     32 public abstract class ExpandableOutlineView extends ExpandableView {
     33 
     34     private final Rect mOutlineRect = new Rect();
     35     private boolean mCustomOutline;
     36     private float mOutlineAlpha = -1f;
     37     private float mOutlineRadius;
     38 
     39     /**
     40      * {@code true} if the children views of the {@link ExpandableOutlineView} are translated when
     41      * it is moved. Otherwise, the translation is set on the {@code ExpandableOutlineView} itself.
     42      */
     43     protected boolean mShouldTranslateContents;
     44 
     45     private final ViewOutlineProvider mProvider = new ViewOutlineProvider() {
     46         @Override
     47         public void getOutline(View view, Outline outline) {
     48             int translation = mShouldTranslateContents ? (int) getTranslation() : 0;
     49             if (!mCustomOutline) {
     50                 outline.setRoundRect(translation,
     51                         mClipTopAmount,
     52                         getWidth() + translation,
     53                         Math.max(getActualHeight() - mClipBottomAmount, mClipTopAmount),
     54                         mOutlineRadius);
     55             } else {
     56                 outline.setRoundRect(mOutlineRect, mOutlineRadius);
     57             }
     58             outline.setAlpha(mOutlineAlpha);
     59         }
     60     };
     61 
     62     public ExpandableOutlineView(Context context, AttributeSet attrs) {
     63         super(context, attrs);
     64         setOutlineProvider(mProvider);
     65         initDimens();
     66     }
     67 
     68     private void initDimens() {
     69         Resources res = getResources();
     70         mShouldTranslateContents =
     71                 res.getBoolean(R.bool.config_translateNotificationContentsOnSwipe);
     72         mOutlineRadius = res.getDimension(R.dimen.notification_shadow_radius);
     73         setClipToOutline(res.getBoolean(R.bool.config_clipNotificationsToOutline));
     74     }
     75 
     76     public void onDensityOrFontScaleChanged() {
     77         initDimens();
     78         invalidateOutline();
     79     }
     80 
     81     @Override
     82     public void setActualHeight(int actualHeight, boolean notifyListeners) {
     83         super.setActualHeight(actualHeight, notifyListeners);
     84         invalidateOutline();
     85     }
     86 
     87     @Override
     88     public void setClipTopAmount(int clipTopAmount) {
     89         super.setClipTopAmount(clipTopAmount);
     90         invalidateOutline();
     91     }
     92 
     93     @Override
     94     public void setClipBottomAmount(int clipBottomAmount) {
     95         super.setClipBottomAmount(clipBottomAmount);
     96         invalidateOutline();
     97     }
     98 
     99     protected void setOutlineAlpha(float alpha) {
    100         if (alpha != mOutlineAlpha) {
    101             mOutlineAlpha = alpha;
    102             invalidateOutline();
    103         }
    104     }
    105 
    106     @Override
    107     public float getOutlineAlpha() {
    108         return mOutlineAlpha;
    109     }
    110 
    111     protected void setOutlineRect(RectF rect) {
    112         if (rect != null) {
    113             setOutlineRect(rect.left, rect.top, rect.right, rect.bottom);
    114         } else {
    115             mCustomOutline = false;
    116             setClipToOutline(false);
    117             invalidateOutline();
    118         }
    119     }
    120 
    121     @Override
    122     public int getOutlineTranslation() {
    123         return mCustomOutline ? mOutlineRect.left : (int) getTranslation();
    124     }
    125 
    126     public void updateOutline() {
    127         if (mCustomOutline) {
    128             return;
    129         }
    130         boolean hasOutline = needsOutline();
    131         setOutlineProvider(hasOutline ? mProvider : null);
    132     }
    133 
    134     /**
    135      * @return Whether the view currently needs an outline. This is usually {@code false} in case
    136      * it doesn't have a background.
    137      */
    138     protected boolean needsOutline() {
    139         if (isChildInGroup()) {
    140             return isGroupExpanded() && !isGroupExpansionChanging();
    141         } else if (isSummaryWithChildren()) {
    142             return !isGroupExpanded() || isGroupExpansionChanging();
    143         }
    144         return true;
    145     }
    146 
    147     public boolean isOutlineShowing() {
    148         ViewOutlineProvider op = getOutlineProvider();
    149         return op != null;
    150     }
    151 
    152     protected void setOutlineRect(float left, float top, float right, float bottom) {
    153         mCustomOutline = true;
    154         setClipToOutline(true);
    155 
    156         mOutlineRect.set((int) left, (int) top, (int) right, (int) bottom);
    157 
    158         // Outlines need to be at least 1 dp
    159         mOutlineRect.bottom = (int) Math.max(top, mOutlineRect.bottom);
    160         mOutlineRect.right = (int) Math.max(left, mOutlineRect.right);
    161 
    162         invalidateOutline();
    163     }
    164 
    165 }
    166