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      1 /*
      2  * Copyright (C) 2015 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 package com.android.packageinstaller.permission.ui;
     17 
     18 import android.content.Context;
     19 import android.util.AttributeSet;
     20 import android.view.View;
     21 import android.view.ViewGroup;
     22 
     23 public class ManualLayoutFrame extends ViewGroup {
     24     private int mContentBottom;
     25     private int mWidth;
     26 
     27     public ManualLayoutFrame(Context context, AttributeSet attrs) {
     28         super(context, attrs);
     29     }
     30 
     31     public void onConfigurationChanged() {
     32         mContentBottom = 0;
     33         mWidth = 0;
     34     }
     35 
     36     @Override
     37     protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
     38         if (mWidth != 0) {
     39             int newWidth = mWidth;
     40             final int widthMode = MeasureSpec.getMode(widthMeasureSpec);
     41             switch (widthMode) {
     42                 case MeasureSpec.AT_MOST: {
     43                     newWidth = Math.min(mWidth, MeasureSpec.getSize(widthMeasureSpec));
     44                 } break;
     45                 case MeasureSpec.EXACTLY: {
     46                     newWidth = MeasureSpec.getSize(widthMeasureSpec);
     47                 } break;
     48             }
     49             if (newWidth != mWidth) {
     50                 mWidth = newWidth;
     51             }
     52             widthMeasureSpec = MeasureSpec.makeMeasureSpec(mWidth, MeasureSpec.EXACTLY);
     53         }
     54         super.onMeasure(widthMeasureSpec, heightMeasureSpec);
     55         if (mWidth == 0) {
     56             mWidth = getMeasuredWidth();
     57         }
     58 
     59         measureChild(getChildAt(0), widthMeasureSpec, heightMeasureSpec);
     60     }
     61 
     62     @Override
     63     protected void onLayout(boolean changed, int left, int top, int right, int bottom) {
     64         // We want to keep the content bottom at the same place to avoid movement of the "Allow"
     65         // button.
     66         // Try to keep the content bottom at the same height. If this would move the dialog out of
     67         // the top of the screen move it down as much as possible, then keep it at that position for
     68         // the rest of the sequence of permission dialogs.
     69         View content = getChildAt(0);
     70         if (mContentBottom == 0 || content.getMeasuredHeight() > mContentBottom) {
     71             mContentBottom = (getMeasuredHeight() + content.getMeasuredHeight()) / 2;
     72         }
     73         final int contentLeft = (getMeasuredWidth() - content.getMeasuredWidth()) / 2;
     74         final int contentTop = mContentBottom - content.getMeasuredHeight();
     75         final int contentRight = contentLeft + content.getMeasuredWidth();
     76         content.layout(contentLeft, contentTop, contentRight, mContentBottom);
     77     }
     78 }
     79