detect which handle is being held

static/javascript/resize_photo_dialouge.js

@@ -57,8 +57,21 @@ document.body.addEventListener("mouseup", () => {
 
 // handle anchors
 resize_anchors = document.getElementsByClassName("resize_anchor");
+var handleBeingHeld = [false, false, false, false];
 for (var i = 0; i < resize_anchors.length; i++) {
-  resize_anchors[i].addEventListener("mousedown", (e) => {
+  const index = i;
+  resize_anchors[index].addEventListener("mousedown", (e) => {
     e.stopPropagation();
+    handleBeingHeld[index] = true;
+  });
+
+  document.body.addEventListener("mouseup", () => {
+    handleBeingHeld[index] = false;
   });
 }
+
+document.body.addEventListener("mousemove", () => {
+  for (var i = 0; i < handleBeingHeld.length; i++) {
+    if (!handleBeingHeld[i]) continue;
+  }
+});