#400: Ensure snap follows mouse cursor on resize, fix cursor feedback

packages/client/css/glsp-sprotty.css

@@ -93,8 +93,16 @@
     cursor: crosshair;
 }
 
-.resize-mode {
-    cursor: none;
+.move-mode {
+    cursor: move;
+}
+
+.resize-nesw-mode {
+    cursor: nesw-resize;
+}
+
+.resize-nwse-mode {
+    cursor: nwse-resize;
 }
 
 .element-deletion-mode {
@@ -103,4 +111,4 @@
 
 .marquee-mode {
     cursor: crosshair;
-}
+}

packages/client/src/features/change-bounds/model.ts

@@ -61,6 +61,15 @@ export class SResizeHandle extends SChildElement implements Hoverable {
     hasFeature(feature: symbol): boolean {
         return feature === hoverFeedbackFeature;
     }
+
+    isNwSeResize(): boolean {
+        return this.location === ResizeHandleLocation.TopLeft || this.location === ResizeHandleLocation.BottomRight;
+    }
+
+    isNeSwResize(): boolean {
+        return this.location === ResizeHandleLocation.TopRight || this.location === ResizeHandleLocation.BottomLeft;
+    }
+
 }
 
 export function addResizeHandles(element: SParentElement): void {

packages/client/src/features/tool-feedback/change-bounds-tool-feedback.ts

@@ -31,10 +31,10 @@ import {
     SModelRoot,
     TYPES
 } from 'sprotty';
-
 import { isNotUndefined } from '../../utils/smodel-util';
 import { addResizeHandles, isResizable, removeResizeHandles, SResizeHandle } from '../change-bounds/model';
 import { createMovementRestrictionFeedback, removeMovementRestrictionFeedback } from '../change-bounds/movement-restrictor';
+import { CursorCSS, cursorFeedbackAction } from '../tool-feedback/css-feedback';
 import { ChangeBoundsTool } from '../tools/change-bounds-tool';
 import { FeedbackCommand } from './model';
 
@@ -120,6 +120,7 @@ export class FeedbackMoveMouseListener extends MouseListener {
             const moveAction = this.getElementMoves(target, event, false);
             if (moveAction) {
                 result.push(moveAction);
+                result.push(cursorFeedbackAction(CursorCSS.MOVE));
             }
         }
         return result;
@@ -224,6 +225,7 @@ export class FeedbackMoveMouseListener extends MouseListener {
             if (this.tool.movementRestrictor) {
                 this.tool.deregisterFeedback([removeMovementRestrictionFeedback(target, this.tool.movementRestrictor)], this);
             }
+            result.push(cursorFeedbackAction(CursorCSS.DEFAULT));
         }
         this.hasDragged = false;
         this.startDragPosition = undefined;

packages/client/src/features/tool-feedback/css-feedback.ts

@@ -78,7 +78,9 @@ export enum CursorCSS {
     EDGE_RECONNECT = 'edge-reconnect-select-target-mode',
     OPERATION_NOT_ALLOWED = 'edge-modification-not-allowed-mode',
     ELEMENT_DELETION = 'element-deletion-mode',
-    RESIZE = 'resize-mode',
+    RESIZE_NESW = 'resize-nesw-mode',
+    RESIZE_NWSE = 'resize-nwse-mode',
+    MOVE = 'move-mode',
     MARQUEE = 'marquee-mode'
 }
 

packages/client/src/features/tools/change-bounds-tool.ts

@@ -162,7 +162,7 @@ export class ChangeBoundsListener extends DragAwareMouseListener implements Sele
             // rely on the FeedbackMoveMouseListener to update the element bounds of selected elements
             // consider resize handles ourselves
             const actions: Action[] = [
-                cursorFeedbackAction(CursorCSS.RESIZE),
+                cursorFeedbackAction(this.activeResizeHandle.isNwSeResize() ? CursorCSS.RESIZE_NWSE : CursorCSS.RESIZE_NESW),
                 applyCssClasses(this.activeResizeHandle, ChangeBoundsListener.CSS_CLASS_ACTIVE)
             ];
             const positionUpdate = this.updatePosition(target, event);
@@ -309,14 +309,14 @@ export class ChangeBoundsListener extends DragAwareMouseListener implements Sele
 
             // snap our delta and only send update if the position actually changes
             // otherwise accumulate delta until we do snap to an update
-            const positionUpdate = this.snap(this.positionDelta, target, !event.shiftKey);
+            const positionUpdate = this.snap(this.positionDelta, target, !event.altKey);
             if (positionUpdate.x === 0 && positionUpdate.y === 0) {
                 return undefined;
             }
 
-            // we update our position so we need to reset our delta
-            this.positionDelta.x = 0;
-            this.positionDelta.y = 0;
+            // we update our position so we update our delta by the snapped position
+            this.positionDelta.x -= positionUpdate.x;
+            this.positionDelta.y -= positionUpdate.y;
             return positionUpdate;
         }
         return undefined;