FadeInCircleBitmapDisplayer.kt

package letstwinkle.com.twinkle.widget

import android.graphics.Bitmap
import android.view.View
import android.view.animation.*
import com.nostra13.universalimageloader.core.assist.LoadedFrom
import com.nostra13.universalimageloader.core.display.CircleBitmapDisplayer
import com.nostra13.universalimageloader.core.imageaware.ImageAware

/**
 * Displays image with "fade in" animation
 * Can display bitmap cropped by a circle. This implementation works only with ImageViews wrapped
 * in ImageViewAware.
 * Although this class supports the border from CircleBitmapDisplayer, I don't recommend using border
 * because it draws inside the image, cutting out even more of the image.
 */
open class FadeInCircleBitmapDisplayer(strokeColor: Int?, strokeWidth: Float, val duration: Int)
    : CircleBitmapDisplayer(strokeColor, strokeWidth) {

    constructor(strokeColor: Int?, duration: Int) : this(strokeColor, 0f, duration)
    constructor(duration: Int) : this(null, duration)

    override fun display(bitmap: Bitmap, imageAware: ImageAware, loadedFrom: LoadedFrom) {
        super.display(bitmap, imageAware, loadedFrom)
        animate(imageAware.wrappedView, duration)
    }

    /**
     * Animates [ImageView] with "fade-in" effect
     * @param imageView      [ImageView] which display image in
     * *
     * @param durationMillis The length of the animation in milliseconds
     */
    private fun animate(imageView: View?, durationMillis: Int) {
        if (imageView != null) {
            val fadeImage = AlphaAnimation(0f, 1f)
            fadeImage.duration = durationMillis.toLong()
            fadeImage.interpolator = LinearInterpolator()
            imageView.startAnimation(fadeImage)
        }
    }
}