iota.Themes.scala Maven / Gradle / Ivy

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package iota

import android.content.Context
import android.content.res.TypedArray
import android.util.{AttributeSet, TypedValue}

/**
  * @author pfnguyen
  */
private[iota] trait Themes {
  // XXX return Option[A] instead?
  /** resolve a single theme attribute */
  def resolveAttr[A](attr: Int, f: TypedValue => A)(implicit ctx: Context): A = {
    val tv = new TypedValue
    val r = ctx.getTheme.resolveAttribute(attr, tv, true)
    if (r) {
      f(tv)
    } else throw new IllegalStateException("attribute not found: " + attr)
  }
  /** retrieve a set of styled theme attributes */
  def styleableAttrs[A](styleable: Array[Int], f: TypedArray => A)(implicit context: Context): A = {
    val themeAttrs = context.getTheme.obtainStyledAttributes(styleable)
    try {
      f(themeAttrs)
    } finally {
      themeAttrs.recycle()
    }
  }
  /** retrieve a styled attributeset */
  def styledAttrs[A](attrs: AttributeSet, styleable: Array[Int], f: TypedArray => A)(implicit context: Context): A = {
    val themeAttrs = context.obtainStyledAttributes(attrs, styleable)
    try {
      f(themeAttrs)
    } finally {
      themeAttrs.recycle()
    }
  }
}