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      1 /*
      2  * Copyright (C) 2016 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 
     18 package com.example.android.common.logger;
     19 
     20 import android.graphics.Typeface;
     21 import android.os.Bundle;
     22 import android.support.v4.app.Fragment;
     23 import android.text.Editable;
     24 import android.text.TextWatcher;
     25 import android.view.Gravity;
     26 import android.view.LayoutInflater;
     27 import android.view.View;
     28 import android.view.ViewGroup;
     29 import android.widget.ScrollView;
     30 
     31 /**
     32  * Simple fraggment which contains a LogView and uses is to output log data it receives
     33  * through the LogNode interface.
     34  */
     35 public class LogFragment extends Fragment {
     36 
     37     private LogView mLogView;
     38     private ScrollView mScrollView;
     39 
     40     public LogFragment() {
     41     }
     42 
     43     public View inflateViews() {
     44         mScrollView = new ScrollView(getActivity());
     45         ViewGroup.LayoutParams scrollParams = new ViewGroup.LayoutParams(
     46                 ViewGroup.LayoutParams.MATCH_PARENT,
     47                 ViewGroup.LayoutParams.MATCH_PARENT);
     48         mScrollView.setLayoutParams(scrollParams);
     49 
     50         mLogView = new LogView(getActivity());
     51         ViewGroup.LayoutParams logParams = new ViewGroup.LayoutParams(scrollParams);
     52         logParams.height = ViewGroup.LayoutParams.WRAP_CONTENT;
     53         mLogView.setTextAppearance(android.R.style.TextAppearance_Material_Medium);
     54         mLogView.setLayoutParams(logParams);
     55         mLogView.setClickable(true);
     56         mLogView.setFocusable(true);
     57         mLogView.setTypeface(Typeface.create("monospace", Typeface.NORMAL));
     58 
     59         // Want to set padding as 16 dips, setPadding takes pixels.  Hooray math!
     60         int paddingDips = 16;
     61         double scale = getResources().getDisplayMetrics().density;
     62         int paddingPixels = (int) ((paddingDips * (scale)) + .5);
     63         mLogView.setPadding(paddingPixels, paddingPixels, paddingPixels, paddingPixels);
     64         mLogView.setCompoundDrawablePadding(paddingPixels);
     65 
     66         mLogView.setGravity(Gravity.BOTTOM);
     67 
     68         mScrollView.addView(mLogView);
     69         return mScrollView;
     70     }
     71 
     72     @Override
     73     public View onCreateView(LayoutInflater inflater, ViewGroup container,
     74             Bundle savedInstanceState) {
     75 
     76         View result = inflateViews();
     77 
     78         mLogView.addTextChangedListener(new TextWatcher() {
     79             @Override
     80             public void beforeTextChanged(CharSequence s, int start, int count, int after) {
     81             }
     82 
     83             @Override
     84             public void onTextChanged(CharSequence s, int start, int before, int count) {
     85             }
     86 
     87             @Override
     88             public void afterTextChanged(Editable s) {
     89 
     90                 mScrollView.post(new Runnable() {
     91                     @Override
     92                     public void run() {
     93                         mScrollView
     94                                 .smoothScrollTo(0, mScrollView.getBottom() + mLogView.getHeight());
     95                     }
     96                 });
     97             }
     98         });
     99         return result;
    100     }
    101 
    102     public LogView getLogView() {
    103         return mLogView;
    104     }
    105 }