Add DrawableHelper.kt

app/src/main/java/chat/rocket/android/app/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
+import android.widget.EditText
+
+/**
+ * @author Filipe de Lima Brito (filipedelimabrito@gmail.com)
+ */
+object DrawableHelper {
+
+    /**
+     * Returns a Drawable from its ID.
+     *
+     * @param id The drawable ID.
+     * @param context The context.
+     * @return A drawable.
+     */
+    fun getDrawableFromId(id: Int, context: Context): Drawable = context.resources.getDrawable(id, null)
+
+    /**
+     * Wraps an array of Drawable to be used for example for tinting.
+     *
+     * @param drawables The array of Drawable to wrap.
+     * @see tintDrawables
+     */
+    fun wrapDrawables(drawables: Array<Drawable>) {
+        for (drawable in drawables) {
+            DrawableCompat.wrap(drawable)
+        }
+    }
+
+    /**
+     * Tints an array of Drawable.
+     *
+     * REMARK: you MUST always wrap the array of Drawable before tint it.
+     *
+     * @param drawables The array of Drawable to tint.
+     * @param context The context.
+     * @param resId The resource id color to tint the Drawables.
+     * @see wrapDrawables
+     */
+    fun tintDrawables(drawables: Array<Drawable>, context: Context, resId: Int) {
+        for (drawable in drawables) {
+            DrawableCompat.setTint(drawable, ContextCompat.getColor(context, resId))
+        }
+    }
+
+    /**
+     * Compounds an array of Drawable (to appear to the left of the text) into an array of EditText.
+     *
+     * REMARK: the number of elements in both array of Drawable and EditText MUST be equal.
+     *
+     * @param editTexts The array of EditText.
+     * @param drawables The array of Drawable.
+     */
+    fun compoundDrawables(editTexts: Array<EditText>, drawables: Array<Drawable>) {
+        if (editTexts.size != drawables.size) {
+            return
+        } else {
+            for (i in editTexts.indices) {
+                editTexts[i].setCompoundDrawablesWithIntrinsicBounds(drawables[i], null, null, null)
+            }
+        }
+    }
+}
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