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      1 /*
      2  * Copyright (C) 2017 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.multiwindowplayground.logger
     18 
     19 import android.graphics.Typeface
     20 import android.os.Bundle
     21 import android.support.v4.app.Fragment
     22 import android.support.v4.app.FragmentActivity
     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.view.ViewGroup.LayoutParams.MATCH_PARENT
     30 import android.view.ViewGroup.LayoutParams.WRAP_CONTENT
     31 import android.widget.ScrollView
     32 
     33 /**
     34  * Simple fragment which contains a [LogView] and is used to output log data it receives through the
     35  * [LogNode] interface.
     36  */
     37 class LogFragment : Fragment() {
     38 
     39     internal lateinit var logView: LogView
     40     private lateinit var scrollView: ScrollView
     41 
     42     private fun inflateViews(): View {
     43         val scrollParams = ViewGroup.LayoutParams(MATCH_PARENT, MATCH_PARENT)
     44         val logParams = ViewGroup.LayoutParams(scrollParams).apply {
     45             height = WRAP_CONTENT
     46         }
     47 
     48         // Want to set padding as 16 dips, setPadding takes pixels.  Hooray math!
     49         val paddingDips = 16
     50         val scale = resources.displayMetrics.density.toDouble()
     51         val paddingPixels = (paddingDips * scale + .5).toInt()
     52 
     53         logView = LogView(activity as FragmentActivity).apply {
     54             setTextAppearance(android.R.style.TextAppearance_Material_Medium)
     55             layoutParams = logParams
     56             isClickable = true
     57             isFocusable = true
     58             typeface = Typeface.create("monospace", Typeface.NORMAL)
     59             setPadding(paddingPixels, paddingPixels, paddingPixels, paddingPixels)
     60             compoundDrawablePadding = paddingPixels
     61             gravity = Gravity.BOTTOM
     62         }
     63 
     64         scrollView = ScrollView(activity).apply {
     65             layoutParams = scrollParams
     66             addView(logView)
     67         }
     68         return scrollView
     69     }
     70 
     71     override fun onCreateView(
     72             inflater: LayoutInflater,
     73             container: ViewGroup?,
     74             savedInstanceState: Bundle?
     75     ): View? {
     76         val result = inflateViews()
     77 
     78         logView.addTextChangedListener(object : TextWatcher {
     79             override fun beforeTextChanged(s: CharSequence, start: Int, count: Int, after: Int) {}
     80 
     81             override fun onTextChanged(s: CharSequence, start: Int, before: Int, count: Int) {}
     82 
     83             override fun afterTextChanged(s: Editable) {
     84                 scrollView.run { post { smoothScrollTo(0, scrollView.bottom + logView.height) }}
     85             }
     86         })
     87         return result
     88     }
     89 
     90 }