Allow the text to grow to fit the space imposed by its parent

AutoFitTextViewLibrary/src/com/lb/auto_fit_textview/AutoResizeTextView.kt

@@ -27,7 +27,8 @@ class AutoResizeTextView @JvmOverloads constructor(context: Context, attrs: Attr
     private var spacingMult = 1.0f
     private var spacingAdd = 0.0f
     private var minTextSize: Float = 0.toFloat()
-    private var widthLimit: Int = 0
+    private var widthLimit: Int = Int.MAX_VALUE
+    private var heightLimit: Int = Int.MAX_VALUE
     private var maxLines: Int = 0
     private var initialized = false
     private var textPaint: TextPaint? = null
@@ -165,6 +166,20 @@ class AutoResizeTextView @JvmOverloads constructor(context: Context, attrs: Attr
         spacingAdd = add
     }
 
+    override fun onMeasure(widthMeasureSpec: Int, heightMeasureSpec: Int) {
+        super.onMeasure(widthMeasureSpec, heightMeasureSpec)
+        widthLimit = if (MeasureSpec.getMode(widthMeasureSpec) == MeasureSpec.UNSPECIFIED) {
+            Int.MAX_VALUE
+        } else {
+            MeasureSpec.getSize(widthMeasureSpec) - compoundPaddingLeft - compoundPaddingRight
+        }
+        heightLimit = if (MeasureSpec.getMode(heightMeasureSpec) == MeasureSpec.UNSPECIFIED) {
+            Int.MAX_VALUE
+        } else {
+            MeasureSpec.getSize(heightMeasureSpec) - compoundPaddingBottom - compoundPaddingTop
+        }
+    }
+
     /**
      * Set the lower text size limit and invalidate the view
      *
@@ -186,9 +201,7 @@ class AutoResizeTextView @JvmOverloads constructor(context: Context, attrs: Attr
         if (!initialized)
             return
         val startSize = minTextSize.toInt()
-        val heightLimit = measuredHeight - compoundPaddingBottom - compoundPaddingTop
-        widthLimit = measuredWidth - compoundPaddingLeft - compoundPaddingRight
-        if (widthLimit <= 0)
+        if (widthLimit <= 0 || heightLimit <= 0)
             return
         textPaint = TextPaint(paint)
         availableSpaceRect.right = widthLimit.toFloat()
@@ -206,7 +219,7 @@ class AutoResizeTextView @JvmOverloads constructor(context: Context, attrs: Attr
     private fun binarySearch(start: Int, end: Int, sizeTester: SizeTester, availableSpace: RectF): Int {
         var lastBest = start
         var lo = start
-        var hi = end - 1
+        var hi = end
         var mid: Int
         while (lo <= hi) {
             mid = (lo + hi).ushr(1)

AutoFitTextViewSample/AndroidManifest.xml

@@ -12,6 +12,7 @@
       </intent-filter>
     </activity>
     <activity android:name=".Main2Activity"></activity>
+    <activity android:name=".DynamicResizeActivity"></activity>
   </application>
 
 </manifest>

AutoFitTextViewSample/res/layout/activity_resize.xml

@@ -0,0 +1,83 @@
+<androidx.constraintlayout.widget.ConstraintLayout
+  xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.com/apk/res-auto" xmlns:tools="http://schemas.android.com/tools"
+  android:layout_width="match_parent" android:layout_height="match_parent" tools:context=".DynamicResizeActivity">
+
+  <EditText
+    android:id="@+id/contentEditText" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_gravity="fill_horizontal" android:ems="10"
+    android:hint="content" android:text="content text sample" app:layout_constraintTop_toTopOf="parent"/>
+
+  <TextView
+    android:id="@+id/maxLineCountTitleTextView" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginStart="4dp"
+    android:gravity="center_vertical" android:text="max lines count:" app:layout_constraintBottom_toBottomOf="@id/minusLineCountButton"
+    app:layout_constraintStart_toStartOf="parent" app:layout_constraintTop_toBottomOf="@id/contentEditText"/>
+
+  <Button
+    android:id="@+id/minusLineCountButton" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="-"
+    app:layout_constraintStart_toEndOf="@id/maxLineCountTitleTextView" app:layout_constraintTop_toBottomOf="@id/contentEditText"/>
+
+  <TextView
+    android:id="@+id/linesCountTextView" android:layout_width="wrap_content" android:layout_height="wrap_content" android:paddingLeft="10dp" android:paddingRight="10dp"
+    android:text="2" app:layout_constraintBottom_toBottomOf="@id/minusLineCountButton" app:layout_constraintStart_toEndOf="@id/minusLineCountButton"
+    app:layout_constraintTop_toBottomOf="@id/contentEditText"/>
+
+
+  <Button
+    android:id="@+id/plusLineCountButton" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_below="@+id/contentEditText" android:text="+"
+    app:layout_constraintStart_toEndOf="@id/linesCountTextView" app:layout_constraintTop_toBottomOf="@id/contentEditText"/>
+
+  <TextView
+    android:id="@+id/startTitleTextView" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginStart="4dp" android:text="start:"
+    android:textSize="20dp" app:layout_constraintStart_toStartOf="parent" app:layout_constraintTop_toBottomOf="@id/minusLineCountButton"/>
+
+  <SeekBar
+    android:id="@+id/startSeekBar" android:layout_width="0px" android:layout_height="wrap_content" android:layout_marginEnd="4dp" android:progress="0"
+    app:layout_constraintBottom_toBottomOf="@id/startTitleTextView" app:layout_constraintEnd_toEndOf="parent" app:layout_constraintStart_toEndOf="@id/startTitleTextView"
+    app:layout_constraintTop_toBottomOf="@id/minusLineCountButton"/>
+
+  <TextView
+      android:id="@+id/topTitleTextView" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginStart="4dp" android:text="top:"
+      android:textSize="20dp" app:layout_constraintStart_toStartOf="parent" app:layout_constraintTop_toBottomOf="@id/startTitleTextView"/>
+
+  <SeekBar
+      android:id="@+id/topSeekBar" android:layout_width="0px" android:layout_height="wrap_content" android:layout_marginEnd="4dp" android:progress="0"
+      app:layout_constraintBottom_toBottomOf="@id/topTitleTextView" app:layout_constraintEnd_toEndOf="parent" app:layout_constraintStart_toEndOf="@id/topTitleTextView"
+      app:layout_constraintTop_toBottomOf="@id/startTitleTextView"/>
+
+  <TextView
+      android:id="@+id/endTitleTextView" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginStart="4dp" android:text="end:"
+      android:textSize="20dp" app:layout_constraintStart_toStartOf="parent" app:layout_constraintTop_toBottomOf="@id/topTitleTextView"/>
+
+  <SeekBar
+      android:id="@+id/endSeekBar" android:layout_width="0px" android:layout_height="wrap_content" android:layout_marginEnd="4dp" android:progress="0"
+      app:layout_constraintBottom_toBottomOf="@id/endTitleTextView" app:layout_constraintEnd_toEndOf="parent" app:layout_constraintStart_toEndOf="@id/endTitleTextView"
+      app:layout_constraintTop_toBottomOf="@id/topTitleTextView"/>
+
+  <TextView
+      android:id="@+id/bottomTitleTextView" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginStart="4dp" android:text="bottom:"
+      android:textSize="20dp" app:layout_constraintStart_toStartOf="parent" app:layout_constraintTop_toBottomOf="@id/endTitleTextView"/>
+
+  <SeekBar
+      android:id="@+id/bottomSeekBar" android:layout_width="0px" android:layout_height="wrap_content" android:layout_marginEnd="4dp" android:progress="0"
+      app:layout_constraintBottom_toBottomOf="@id/bottomTitleTextView" app:layout_constraintEnd_toEndOf="parent" app:layout_constraintStart_toEndOf="@id/bottomTitleTextView"
+      app:layout_constraintTop_toBottomOf="@id/endTitleTextView"/>
+
+  <androidx.constraintlayout.widget.ConstraintLayout
+    android:id="@+id/textViewContainer" android:layout_width="match_parent" android:layout_height="0px" android:background="#ffff0000"
+    app:layout_constraintBottom_toBottomOf="parent" app:layout_constraintTop_toBottomOf="@id/bottomTitleTextView">
+
+    <View
+        android:id="@+id/topStartMargin" android:layout_width="1dp" android:layout_height="1dp"
+        app:layout_constraintTop_toTopOf="parent" app:layout_constraintStart_toStartOf="parent"/>
+
+    <View
+        android:id="@+id/bottomEndMargin" android:layout_width="1dp" android:layout_height="1dp"
+        app:layout_constraintBottom_toBottomOf="parent" app:layout_constraintEnd_toEndOf="parent"/>
+
+    <com.lb.auto_fit_textview.AutoResizeTextView
+        android:id="@+id/contentTextView" android:layout_width="0dp" android:layout_height="0dp" android:background="#ff00ff00" android:textSize="200sp" android:ellipsize="end"
+        app:layout_constraintTop_toBottomOf="@id/topStartMargin" app:layout_constraintStart_toEndOf="@id/topStartMargin"
+        app:layout_constraintEnd_toStartOf="@id/bottomEndMargin" app:layout_constraintBottom_toTopOf="@id/bottomEndMargin"/>
+
+  </androidx.constraintlayout.widget.ConstraintLayout>
+
+</androidx.constraintlayout.widget.ConstraintLayout>

AutoFitTextViewSample/res/menu/main.xml

@@ -4,6 +4,7 @@
     <menu>
       <group android:checkableBehavior="none" android:menuCategory="container">
         <item android:id="@+id/menuItem_show_recyclerViewSample" android:title="show RecyclerView sample"/>
+        <item android:id="@+id/menuItem_show_dynamicResizeSample" android:title="show dynamic resizing sample"/>
         <item android:id="@+id/menuItem_current_repository_website" android:title="Repository website"></item>
         <item android:id="@+id/menuItem_all_my_repositories" android:title="All my repositories"></item>
         <item android:id="@+id/menuItem_all_my_apps" android:title="All my apps"></item>

AutoFitTextViewSample/src/com/example/autofittextviewsample/DynamicResizeActivity.kt

@@ -0,0 +1,92 @@
+package com.example.autofittextviewsample
+
+import android.os.Bundle
+import android.text.Editable
+import android.text.TextWatcher
+import android.view.View
+import android.view.View.OnClickListener
+import android.widget.SeekBar
+import android.widget.SeekBar.OnSeekBarChangeListener
+import androidx.appcompat.app.AppCompatActivity
+import androidx.constraintlayout.widget.ConstraintLayout
+import androidx.core.view.updateLayoutParams
+import kotlinx.android.synthetic.main.activity_resize.*
+
+class DynamicResizeActivity : AppCompatActivity() {
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        setContentView(R.layout.activity_resize)
+        contentEditText!!.addTextChangedListener(object : TextWatcher {
+            override fun onTextChanged(s: CharSequence, start: Int, before: Int, count: Int) {}
+
+            override fun beforeTextChanged(s: CharSequence, start: Int, count: Int, after: Int) {}
+
+            override fun afterTextChanged(s: Editable) {
+                contentTextView!!.text = contentEditText!!.text.toString()
+            }
+        })
+        startSeekBar!!.setOnSeekBarChangeListener(object : OnSeekBarChangeListener {
+            override fun onStopTrackingTouch(seekBar: SeekBar) {}
+
+            override fun onStartTrackingTouch(seekBar: SeekBar) {}
+
+            override fun onProgressChanged(p0: SeekBar?, p1: Int, p2: Boolean) {
+                topStartMargin!!.updateLayoutParams<ConstraintLayout.LayoutParams> {
+                    // textViewContainer!!.width / 2 so each margin only goes to the center
+                    width = 1.coerceAtLeast(startSeekBar!!.progress * textViewContainer!!.width / 2 / startSeekBar!!.max)
+                }
+            }
+        })
+        topSeekBar!!.setOnSeekBarChangeListener(object : OnSeekBarChangeListener {
+            override fun onStopTrackingTouch(seekBar: SeekBar) {}
+
+            override fun onStartTrackingTouch(seekBar: SeekBar) {}
+
+            override fun onProgressChanged(p0: SeekBar?, p1: Int, p2: Boolean) {
+                topStartMargin!!.updateLayoutParams<ConstraintLayout.LayoutParams> {
+                    // textViewContainer!!.height / 2 so each margin only goes to the center
+                    height = 1.coerceAtLeast(topSeekBar!!.progress * textViewContainer!!.height / 2 / topSeekBar!!.max)
+                }
+            }
+        })
+        endSeekBar!!.setOnSeekBarChangeListener(object : OnSeekBarChangeListener {
+            override fun onStopTrackingTouch(seekBar: SeekBar) {}
+
+            override fun onStartTrackingTouch(seekBar: SeekBar) {}
+
+            override fun onProgressChanged(p0: SeekBar?, p1: Int, p2: Boolean) {
+                bottomEndMargin!!.updateLayoutParams<ConstraintLayout.LayoutParams> {
+                    // textViewContainer!!.width / 2 so each margin only goes to the center
+                    width = 1.coerceAtLeast(endSeekBar!!.progress * textViewContainer!!.width / 2 / endSeekBar!!.max)
+                }
+            }
+        })
+        bottomSeekBar!!.setOnSeekBarChangeListener(object : OnSeekBarChangeListener {
+            override fun onStopTrackingTouch(seekBar: SeekBar) {}
+
+            override fun onStartTrackingTouch(seekBar: SeekBar) {}
+
+            override fun onProgressChanged(p0: SeekBar?, p1: Int, p2: Boolean) {
+                bottomEndMargin!!.updateLayoutParams<ConstraintLayout.LayoutParams> {
+                    // textViewContainer!!.height / 2 so each margin only goes to the center
+                    height = 1.coerceAtLeast(bottomSeekBar!!.progress * textViewContainer!!.height / 2 / bottomSeekBar!!.max)
+                }
+            }
+        })
+        findViewById<View>(R.id.plusLineCountButton).setOnClickListener {
+            var maxLinesCount = Integer.parseInt(linesCountTextView!!.text.toString())
+            linesCountTextView!!.text = Integer.toString(++maxLinesCount)
+            contentTextView!!.maxLines = maxLinesCount
+        }
+        findViewById<View>(R.id.minusLineCountButton).setOnClickListener(OnClickListener {
+            var maxLinesCount = Integer.parseInt(linesCountTextView!!.text.toString())
+            if (maxLinesCount == 1)
+                return@OnClickListener
+            linesCountTextView!!.text = Integer.toString(--maxLinesCount)
+            contentTextView!!.maxLines = maxLinesCount
+        })
+        // synchronize contentTextView to the controls
+        contentTextView!!.text = contentEditText!!.text.toString()
+        contentTextView!!.maxLines = Integer.parseInt(linesCountTextView!!.text.toString())
+    }
+}

AutoFitTextViewSample/src/com/example/autofittextviewsample/MainActivity.kt

@@ -106,6 +106,10 @@ class MainActivity : AppCompatActivity() {
                 startActivity(Intent(this, Main2Activity::class.java))
                 return true
             }
+            R.id.menuItem_show_dynamicResizeSample -> {
+                startActivity(Intent(this, DynamicResizeActivity::class.java))
+                return true
+            }
         }
         if (url == null)
             return true