TextDrawable.kt

package com.vinted.drawables

import android.content.res.ColorStateList
import android.graphics.*
import android.graphics.drawable.Drawable
import android.text.DynamicLayout
import android.text.Editable
import android.text.Layout
import android.text.TextPaint

/**
 * @author Andrius Semionovas
 * @since 2015-07-15
 */
class TextDrawable : Drawable() {
    private val paint = TextPaint(Paint.ANTI_ALIAS_FLAG)
    private val editable = Editable.Factory().newEditable("")
    private val layout = DynamicLayout(editable, paint, Integer.MAX_VALUE, Layout.Alignment.ALIGN_NORMAL, 1f, 0f, false)

    private val textBounds = Rect()

    override fun draw(canvas: Canvas) {
        layout.draw(canvas)
    }

    override fun setAlpha(alpha: Int) {
        paint.alpha = alpha

        invalidateSelf()
    }

    override fun setColorFilter(cf: ColorFilter?) {
        paint.colorFilter = cf

        invalidateSelf()
    }

    override fun setTintList(tint: ColorStateList) {
        setTint(tint.defaultColor)
    }

    override fun setTint(tintColor: Int) {
        setTextColor(tintColor)

        invalidateSelf()
    }

    fun setTextSize(size: Float) {
        paint.textSize = size

        invalidateSelf()
    }

    fun setText(text: CharSequence) {
        editable.clear()
        editable.append(text)

        paint.getTextBounds(text.toString(), 0, text.length, textBounds)

        invalidateSelf()
    }

    fun setTextColor(color: Int) {
        paint.color = color
    }

    override fun getIntrinsicWidth() = DynamicLayout.getDesiredWidth(editable, paint).toInt()

    override fun getIntrinsicHeight() = -textBounds.top + textBounds.bottom

    override fun getOpacity() = PixelFormat.TRANSLUCENT
}