1 files changed, 17 insertions, 10 deletions

diff --git a/src/client/views/nodes/DocumentView.tsx b/src/client/views/nodes/DocumentView.tsx
index b98627c66..98ae7442f 100644
--- a/src/client/views/nodes/DocumentView.tsx
+++ b/src/client/views/nodes/DocumentView.tsx
@@ -103,8 +103,10 @@ export const documentSchema = createSchema({
     backgroundColor: "string",  // background color of document
     opacity: "number",          // opacity of document
     dropAction: "string",       // override specifying what should happen when this document is dropped (can be "alias" or "copy")
-    removeDropProperties: listSpec("string"), // properties that should be removed from the alias/copy/etc of this document when it is dropped (used for dragBox things)
+    removeDropProperties: listSpec("string"), // properties that should be removed from the alias/copy/etc of this document when it is dropped
     onClick: ScriptField,       // script to run when document is clicked (can be overriden by an onClick prop)
+    onDragStart: ScriptField,   // script to run when document is dragged (without being selected).  the script should return an Doc to drag.
+    dragFactory: Doc,           // the document that serves as the "template" for the onDragStart script
     ignoreAspect: "boolean",    // whether aspect ratio should be ignored when laying out or manipulating the document
     autoHeight: "boolean",      // whether the height of the document should be computed automatically based on its contents
     isTemplate: "boolean",      // whether this document acts as a template layout for describing how other documents should be displayed
@@ -165,16 +167,15 @@ export class DocumentView extends DocComponent<DocumentViewProps, Document>(Docu
         if (this._mainCont.current) {
             let dragData = new DragManager.DocumentDragData([this.props.Document]);
             const [left, top] = this.props.ScreenToLocalTransform().scale(this.props.ContentScaling()).inverse().transformPoint(0, 0);
-            dragData.offset = this.props.ScreenToLocalTransform().scale(this.props.ContentScaling()).transformDirection(x - left, y - top);
+            dragData.offset = this.Document.onDragStart ? [0, 0] : this.props.ScreenToLocalTransform().scale(this.props.ContentScaling()).transformDirection(x - left, y - top);
             dragData.dropAction = dropAction;
-            dragData.moveDocument = this.props.moveDocument;
+            dragData.moveDocument = this.Document.onDragStart ? undefined : this.props.moveDocument;
             dragData.applyAsTemplate = applyAsTemplate;
-            dragData.removeDropProperties = this.Document.removeDropProperties || [];
             DragManager.StartDocumentDrag([this._mainCont.current], dragData, x, y, {
                 handlers: {
                     dragComplete: action((emptyFunction))
                 },
-                hideSource: !dropAction
+                hideSource: !dropAction && !this.Document.onDragStart
             });
         }
     }
@@ -246,7 +247,7 @@ export class DocumentView extends DocComponent<DocumentViewProps, Document>(Docu
                 this._hitTemplateDrag = true;
             }
         }
-        if (this.active && e.button === 0 && !this.Document.lockedPosition && !this.Document.inOverlay) e.stopPropagation(); // events stop at the lowest document that is active.  if right dragging, we let it go through though to allow for context menu clicks. PointerMove callbacks should remove themselves if the move event gets stopPropagated by a lower-level handler (e.g, marquee drag);
+        if ((this.active || this.Document.onDragStart) && e.button === 0 && !this.Document.lockedPosition && !this.Document.inOverlay) e.stopPropagation(); // events stop at the lowest document that is active.  if right dragging, we let it go through though to allow for context menu clicks. PointerMove callbacks should remove themselves if the move event gets stopPropagated by a lower-level handler (e.g, marquee drag);
         document.removeEventListener("pointermove", this.onPointerMove);
         document.removeEventListener("pointerup", this.onPointerUp);
         document.addEventListener("pointermove", this.onPointerMove);
@@ -258,9 +259,9 @@ export class DocumentView extends DocComponent<DocumentViewProps, Document>(Docu
         if (e.cancelBubble && this.active) {
             document.removeEventListener("pointermove", this.onPointerMove); // stop listening to pointerMove if something else has stopPropagated it (e.g., the MarqueeView)
         }
-        else if (!e.cancelBubble && (SelectionManager.IsSelected(this) || this.props.parentActive()) && !this.Document.lockedPosition && !this.Document.inOverlay) {
+        else if (!e.cancelBubble && (SelectionManager.IsSelected(this) || this.props.parentActive() || this.Document.onDragStart) && !this.Document.lockedPosition && !this.Document.inOverlay) {
             if (Math.abs(this._downX - e.clientX) > 3 || Math.abs(this._downY - e.clientY) > 3) {
-                if (!e.altKey && !this.topMost && e.buttons === 1) {
+                if (!e.altKey && (!this.topMost || this.Document.onDragStart) && e.buttons === 1) {
                     document.removeEventListener("pointermove", this.onPointerMove);
                     document.removeEventListener("pointerup", this.onPointerUp);
                     this.startDragging(this._downX, this._downY, this.Document.dropAction ? this.Document.dropAction as any : e.ctrlKey || e.altKey ? "alias" : undefined, this._hitTemplateDrag);
@@ -475,6 +476,12 @@ export class DocumentView extends DocComponent<DocumentViewProps, Document>(Docu
         });
         !existingOnClick && cm.addItem({ description: "OnClick...", subitems: onClicks, icon: "hand-point-right" });
 
+        let funcs: ContextMenuProps[] = [];
+        funcs.push({ description: "Drag an Alias", icon: "edit", event: () => this.Document.dragFactory && (this.Document.onDragStart = ScriptField.MakeFunction('getAlias(this.dragFactory)')) });
+        funcs.push({ description: "Drag a Copy", icon: "edit", event: () => this.Document.dragFactory && (this.Document.onDragStart = ScriptField.MakeFunction('getCopy(this.dragFactory, true)')) });
+        funcs.push({ description: "Drag Document", icon: "edit", event: () => this.Document.onDragStart = undefined });
+        ContextMenu.Instance.addItem({ description: "OnDrag...", subitems: funcs, icon: "asterisk" });
+
         let existing = ContextMenu.Instance.findByDescription("Layout...");
         let layoutItems: ContextMenuProps[] = existing && "subitems" in existing ? existing.subitems : [];
         layoutItems.push({ description: this.Document.isBackground ? "As Foreground" : "As Background", event: this.makeBackground, icon: this.Document.lockedPosition ? "unlock" : "lock" });
@@ -627,8 +634,8 @@ export class DocumentView extends DocComponent<DocumentViewProps, Document>(Docu
             this.props.backgroundColor(this.Document) || StrCast(this.layoutDoc.backgroundColor) :
             ruleColor && !colorSet ? ruleColor : StrCast(this.layoutDoc.backgroundColor) || this.props.backgroundColor(this.Document);
 
-        const nativeWidth = this.props.Document.fitWidth ? this.props.PanelWidth() : this.nativeWidth > 0 && !this.Document.ignoreAspect ? `${this.nativeWidth}px` : "100%";
-        const nativeHeight = this.props.Document.fitWidth ? this.props.PanelHeight() : this.Document.ignoreAspect ? this.props.PanelHeight() / this.props.ContentScaling() : this.nativeHeight > 0 ? `${this.nativeHeight}px` : "100%";
+        const nativeWidth = this.props.Document.fitWidth ? this.props.PanelWidth() - 2 : this.nativeWidth > 0 && !this.Document.ignoreAspect ? `${this.nativeWidth}px` : "100%";
+        const nativeHeight = this.props.Document.fitWidth ? this.props.PanelHeight() - 2 : this.Document.ignoreAspect ? this.props.PanelHeight() / this.props.ContentScaling() : this.nativeHeight > 0 ? `${this.nativeHeight}px` : "100%";
         const showOverlays = this.props.showOverlays ? this.props.showOverlays(this.Document) : undefined;
         const showTitle = showOverlays && "title" in showOverlays ? showOverlays.title : this.getLayoutPropStr("showTitle");
         const showCaption = showOverlays && "caption" in showOverlays ? showOverlays.caption : this.getLayoutPropStr("showCaption");