From 627adb92b604e117694e26af65afdc19920ac509 Mon Sep 17 00:00:00 2001
From: Bob Zeleznik <zzzman@gmail.com>
Date: Sat, 25 Apr 2020 21:26:28 -0400
Subject: added internalPreDrop to set dropActions.  made linksView turn off
 during dragging.

---
 src/client/util/DragManager.ts | 22 ++++++++++++++++++++--
 1 file changed, 20 insertions(+), 2 deletions(-)

(limited to 'src/client/util')

diff --git a/src/client/util/DragManager.ts b/src/client/util/DragManager.ts
index 6bb44f7d6..6a55f4a00 100644
--- a/src/client/util/DragManager.ts
+++ b/src/client/util/DragManager.ts
@@ -179,7 +179,8 @@ export namespace DragManager {
 
     export function MakeDropTarget(
         element: HTMLElement,
-        dropFunc: (e: Event, de: DropEvent) => void
+        dropFunc: (e: Event, de: DropEvent) => void,
+        preDropFunc?: (e: Event, de: DropEvent) => void
     ): DragDropDisposer {
         if ("canDrop" in element.dataset) {
             throw new Error(
@@ -187,10 +188,13 @@ export namespace DragManager {
             );
         }
         element.dataset.canDrop = "true";
-        const handler = (e: Event) => { dropFunc(e, (e as CustomEvent<DropEvent>).detail); };
+        const handler = (e: Event) => dropFunc(e, (e as CustomEvent<DropEvent>).detail);
+        const preDropHandler = (e: Event) => preDropFunc?.(e, (e as CustomEvent<DropEvent>).detail);
         element.addEventListener("dashOnDrop", handler);
+        preDropFunc && element.addEventListener("dashPreDrop", preDropHandler);
         return () => {
             element.removeEventListener("dashOnDrop", handler);
+            preDropFunc && element.removeEventListener("dashPreDrop", preDropHandler);
             delete element.dataset.canDrop;
         };
     }
@@ -425,6 +429,20 @@ export namespace DragManager {
         });
         if (target) {
             const complete = new DragCompleteEvent(false, dragData);
+            target.dispatchEvent(
+                new CustomEvent<DropEvent>("dashPreDrop", {
+                    bubbles: true,
+                    detail: {
+                        x: e.x,
+                        y: e.y,
+                        complete: complete,
+                        shiftKey: e.shiftKey,
+                        altKey: e.altKey,
+                        metaKey: e.metaKey,
+                        ctrlKey: e.ctrlKey
+                    }
+                })
+            );
             finishDrag?.(complete);
             target.dispatchEvent(
                 new CustomEvent<DropEvent>("dashOnDrop", {
-- 
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