package com.example.firstapp.view
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import android.content.Context
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import android.graphics.Canvas
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import android.graphics.Paint
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import android.util.AttributeSet
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import androidx.appcompat.widget.AppCompatTextView
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import androidx.core.content.ContextCompat
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class UnderlineTextView @JvmOverloads constructor(
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context: Context,
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attrs: AttributeSet? = null,
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defStyleAttr: Int = 0
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) : AppCompatTextView(context, attrs, defStyleAttr) {
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private val underlinePaint = Paint().apply {
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color = ContextCompat.getColor(context, android.R.color.black)
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strokeWidth = context.resources.displayMetrics.density * 2 // 2dp
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}
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private var showUnderline = false
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fun setUnderlineVisible(visible: Boolean) {
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showUnderline = visible
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invalidate()
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}
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override fun onDraw(canvas: Canvas) {
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super.onDraw(canvas)
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if (showUnderline) {
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val textWidth = paint.measureText(text.toString())
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val startX = (width - textWidth) / 2
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canvas.drawLine(
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startX,
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height - underlinePaint.strokeWidth,
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startX + textWidth,
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height - underlinePaint.strokeWidth,
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underlinePaint
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)
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}
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}
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}
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