Enhancement/coroutines (#180)

* Add coroutine dependency

* Add coroutines to kprefactivity

* Change base job to supervisor

* Update coroutines for faq

* Update changelog

* Use preloading in media picker core

* Make test logging internal

* Remove anko

1 files changed, 26 insertions, 1 deletions

diff --git a/core/src/main/kotlin/ca/allanwang/kau/utils/ContextUtils.kt b/core/src/main/kotlin/ca/allanwang/kau/utils/ContextUtils.kt
index 134126d..60ef236 100644
--- a/core/src/main/kotlin/ca/allanwang/kau/utils/ContextUtils.kt
+++ b/core/src/main/kotlin/ca/allanwang/kau/utils/ContextUtils.kt
@@ -1,5 +1,5 @@
 /*
- * Copyright 2018 Allan Wang
+ * Copyright 2017 Allan Wang
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -26,6 +26,8 @@ import android.content.pm.PackageManager
 import android.graphics.drawable.Drawable
 import android.net.Uri
 import android.os.Bundle
+import android.os.Handler
+import android.os.Looper
 import android.util.TypedValue
 import android.view.View
 import android.view.animation.AnimationUtils
@@ -45,10 +47,33 @@ import androidx.core.content.ContextCompat
 import ca.allanwang.kau.R
 import ca.allanwang.kau.logging.KL
 import com.afollestad.materialdialogs.MaterialDialog
+import kotlinx.coroutines.CoroutineScope
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.GlobalScope
+import kotlin.coroutines.CoroutineContext
 
 /**
  * Created by Allan Wang on 2017-06-03.
  */
+private object ContextHelper: CoroutineScope {
+
+    val handler = Handler(Looper.getMainLooper())
+
+    override val coroutineContext: CoroutineContext
+        get() = Dispatchers.Main
+}
+
+/**
+ * Most context items implement [CoroutineScope] by default.
+ * We will add a fallback just in case.
+ * It is expected that the scope returned always has the Android main dispatcher as part of the context.
+ */
+internal inline val Context.ctxCoroutine: CoroutineScope
+    get() = this as? CoroutineScope ?: ContextHelper
+
+fun Context.runOnUiThread(f: Context.() -> Unit) {
+    if (Looper.getMainLooper() === Looper.myLooper()) f() else ContextHelper.handler.post { f() }
+}
 
 /**
  * Helper class to launch an activity from a context