Add constants for legal DragEffect values

Author: japgolly

src/main/scala/org/scalajs/dom/raw/lib.scala

@@ -3730,6 +3730,46 @@ trait NavigatorGeolocation extends js.Object {
 trait NavigatorContentUtils extends js.Object {
 }
 
+/**
+ * When dragging, there are several operations that may be performed. The copy operation is
+ * used to indicate that the data being dragged will be copied from its present location to
+ * the drop location. The move operation is used to indicate that the data being dragged will
+ * be moved, and the link operation is used to indicate that some form of relationship or
+ * connection will be created between the source and drop locations.
+ *
+ * You can specify which of the three operations are allowed for a drag source by setting the
+ * `effectAllowed` property within a `dragstart` event listener.
+ *
+ * Note that these values must be used exactly as defined below.
+ *
+ * https://developer.mozilla.org/en-US/docs/Web/Guide/HTML/Drag_operations#drageffects
+ */
+object DataEffect {
+
+  /** no operation is permitted */
+  val None = "none"
+
+  /** copy only */
+  val Copy = "copy"
+
+  /** move only */
+  val Move = "move"
+
+  /** link only */
+  val Link = "link"
+
+  /** copy or move only */
+  val CopyMove = "copyMove"
+
+  /** copy or link only */
+  val CopyLink = "copyLink"
+
+  /** link or move only */
+  val LinkMove = "linkMove"
+
+  /** copy, move, or link */
+  val All = "all"
+}
 
 /**
  * The DataTransfer object is used to hold the data that is being dragged during a drag
@@ -3749,6 +3789,8 @@ trait DataTransfer extends js.Object {
    * for other events.
    *
    * MDN
+   *
+   * See [[DataEffect]] for possible values.
    */
   var effectAllowed: String = js.native
 
@@ -3757,6 +3799,8 @@ trait DataTransfer extends js.Object {
    * of effectAllowed.
    *
    * MDN
+   *
+   * See [[DataEffect]] for possible values.
    */
   var dropEffect: String = js.native