Merge pull request #20 from Omega-R/feature/image_preload

Added image preload methods

Author: anton-knyazev

glide/src/main/java/com/omega_r/libs/omegatypes/glide/GlideImage.kt

@@ -21,6 +21,12 @@ import java.io.InputStream
 
 class GlideImage(override val url: String) : Image(), UrlImage {
 
+    override fun preload(context: Context) {
+        Glide.with(context)
+                .load(url)
+                .preload()
+    }
+
     override fun applyImage(imageView: ImageView, placeholderResId: Int) {
         Glide.with(imageView)
                 .load(url)

omegatypes/src/main/java/com/omega_r/libs/omegatypes/Image.kt

@@ -15,6 +15,10 @@ import java.io.*
 
 open class Image : Serializable {
 
+    open fun preload(context: Context) {
+        // nothing
+    }
+
     open fun applyImage(imageView: ImageView, placeholderResId: Int = 0) {
         if (placeholderResId == 0) {
             imageView.setImageDrawable(null)

picasso/src/main/java/com/omega_r/libs/omegatypes/picasso/PicassoImage.kt

@@ -22,6 +22,12 @@ import java.io.InputStream
 
 class PicassoImage(override val url: String) : Image(), UrlImage {
 
+    override fun preload(context: Context) {
+        Picasso.get()
+                .load(url)
+                .fetch()
+    }
+
     override fun applyImage(imageView: ImageView, placeholderResId: Int) {
         Picasso.get()
                 .load(url)