Add DrawableHelper.kt

rocket-chat-android-widgets/src/main/java/chat/rocket/android/widget/helper/DrawableHelper.kt

+package chat.rocket.android.widget.helper
+
+import android.content.Context
+import android.graphics.drawable.Drawable
+import android.support.v4.content.ContextCompat
+import android.support.v4.graphics.drawable.DrawableCompat
+
+object DrawableHelper {
+
+    /**
+     * Wraps a drawable to be used for example for tinting.
+     *
+     * @param drawable The drawable to wrap.
+     * @see tintDrawable
+     */
+    fun wrapDrawable(drawable: Drawable) {
+        DrawableCompat.wrap(drawable)
+    }
+
+    /**
+     * REMARK: You MUST always wrap the drawable before tint it.
+     *
+     * @param drawable The drawable to tint.
+     * @param context The context.
+     * @param resId The resource id color to tint the drawable.
+     * @see wrapDrawable
+     */
+    fun tintDrawable(drawable: Drawable, context: Context, resId: Int) {
+        DrawableCompat.setTint(drawable, ContextCompat.getColor(context, resId))
+    }
+}
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