Created
April 19, 2022 06:35
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EditText extention to auto-resize fonts (+ in other fields) if the text is too long
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package com.utils.texts | |
import android.graphics.Paint | |
import android.graphics.Rect | |
import android.text.Editable | |
import android.text.TextWatcher | |
import android.util.TypedValue | |
import android.widget.EditText | |
import kotlin.math.max | |
import kotlin.math.min | |
import androidx.core.widget.doAfterTextChanged | |
// usage in onCreate with edit text: | |
// binding.editText.autocorrectSize() { size -> | |
// binding.altText.setTextSize(TypedValue.COMPLEX_UNIT_PX, size) | |
// binding.altOtherText.setTextSize(TypedValue.COMPLEX_UNIT_PX, size) | |
// } | |
fun EditText.autocorrectSize(callback: ((Float) -> Unit)? = null) { | |
val originalTextSize = textSize | |
val bounds = Rect() | |
val paintForSearch = Paint() | |
paintForSearch.typeface = paint.typeface | |
paintForSearch.strokeWidth = paint.strokeWidth | |
paintForSearch.isAntiAlias = true | |
paintForSearch.textSize = paint.textSize | |
doAfterTextChanged { | |
val txt = it.toString() | |
if (width > 0) { | |
val minCorrection = width - originalTextSize / 2 | |
paintForSearch.getTextBounds(txt, 0, txt.length, bounds) | |
if (bounds.width() > minCorrection) { | |
do { | |
paintForSearch.getTextBounds(txt, 0, txt.length, bounds) | |
if (bounds.width() > minCorrection) { | |
paintForSearch.textSize = max(paintForSearch.textSize - 1f, 10f) | |
} | |
} while (bounds.width() > minCorrection) | |
} else if (originalTextSize > paintForSearch.textSize) { | |
do { | |
paintForSearch.getTextBounds(txt, 0, txt.length, bounds) | |
if (bounds.width() < minCorrection) { | |
paintForSearch.textSize = min(paintForSearch.textSize + 1f, originalTextSize) | |
} | |
} while (bounds.width() < minCorrection && paintForSearch.textSize < originalTextSize) | |
} | |
} | |
setTextSize(TypedValue.COMPLEX_UNIT_PX, paintForSearch.textSize) | |
callback?.invoke(paintForSearch.textSize) | |
} | |
} |
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