fix: resize only on direction of drag move

packages/dashboard/src/widget-resize-controller.js

@@ -89,10 +89,10 @@ export class WidgetResizeController {
 
     const currentElementHeight = itemWrapper.firstElementChild.offsetHeight;
     const rowMinHeight = Math.min(...gridStyle.gridTemplateRows.split(' ').map((height) => parseFloat(height)));
-    if (this.__resizeHeight > currentElementHeight + gapSize + rowMinHeight / 2) {
+    if (e.detail.ddy > 0 && this.__resizeHeight > currentElementHeight + gapSize + rowMinHeight / 2) {
       // Resized vertically above the half of the next row, increase rowspan
       this.__updateResizedItem(0, 1);
-    } else if (this.__resizeHeight < currentElementHeight - rowMinHeight / 2) {
+    } else if (e.detail.ddy < 0 && this.__resizeHeight < currentElementHeight - rowMinHeight / 2) {
       // Resized vertically below the half of the current row, decrease rowspan
       this.__updateResizedItem(0, -1);
     }

packages/dashboard/test/dashboard-widget-resizing.test.ts

@@ -1,5 +1,5 @@
 import { expect } from '@vaadin/chai-plugins';
-import { fixtureSync, nextFrame } from '@vaadin/testing-helpers';
+import { fire, fixtureSync, nextFrame } from '@vaadin/testing-helpers';
 import sinon from 'sinon';
 import '../vaadin-dashboard.js';
 import { isSafari } from '@vaadin/component-base/src/browser-utils.js';
@@ -11,6 +11,8 @@ import {
   fireResizeOver,
   fireResizeStart,
   getElementFromCell,
+  getEventCoordinates,
+  getResizeHandle,
   onceResized,
   setMaximumColumnWidth,
   setMinimumColumnWidth,
@@ -201,10 +203,34 @@ describe('dashboard - widget resizing', () => {
         [0, 2],
       ]);
 
+      const resizeHandle = getResizeHandle(getElementFromCell(dashboard, 1, 0)!);
+      const { x: initialX, y: initialY } = getEventCoordinates(resizeHandle, 'bottom');
+
       fireResizeStart(getElementFromCell(dashboard, 1, 0)!);
       await nextFrame();
 
-      fireResizeOver(getElementFromCell(dashboard, 0, 0)!, 'top');
+      const targetElement = getElementFromCell(dashboard, 0, 0)!;
+      fireResizeOver(targetElement, 'top');
+      await nextFrame();
+
+      const { x: targetX, y: targetY } = getEventCoordinates(targetElement, 'top');
+      const event = new MouseEvent('mousemove', {
+        bubbles: true,
+        composed: true,
+        clientX: targetX,
+        clientY: targetY,
+        buttons: 1,
+      });
+      targetElement.dispatchEvent(event);
+      fire(resizeHandle, 'track', {
+        state: 'track',
+        x: targetX,
+        y: targetY - 1,
+        dx: targetX - initialX,
+        dy: targetY - initialY - 1,
+        ddx: 0,
+        ddy: -1,
+      });
       await nextFrame();
 
       fireResizeEnd(dashboard);
@@ -323,6 +349,99 @@ describe('dashboard - widget resizing', () => {
       ]);
     });
 
+    (isSafari ? it.skip : it)('should resize only when dragged in the same direction (top -> bottom)', async () => {
+      setMinimumRowHeight(dashboard, 50);
+      dashboard.items = [{ id: 0, rowspan: 2 }, { id: 1 }, { id: 2 }];
+      await nextFrame();
+
+      // prettier-ignore
+      expectLayout(dashboard, [
+        [0, 1],
+        [0, 2],
+      ]);
+
+      const widget = getElementFromCell(dashboard, 0, 1)!;
+      const initialHeight = widget.offsetHeight;
+      fireResizeStart(widget);
+      await nextFrame();
+
+      const targetElement = getElementFromCell(dashboard, 1, 1)!;
+      const { x, y } = getEventCoordinates(targetElement, 'top');
+      const minSizeIncreaseDelta = initialHeight / 2 + 1;
+      const minSizeIncreaseY = y + minSizeIncreaseDelta;
+      const event = new MouseEvent('mousemove', {
+        bubbles: true,
+        composed: true,
+        clientX: x,
+        clientY: minSizeIncreaseY,
+        buttons: 1,
+      });
+      targetElement.dispatchEvent(event);
+      await nextFrame();
+
+      let previousHeight = initialHeight;
+      const resizeHandle = getResizeHandle(widget);
+      for (let i = 1; i < 5; i++) {
+        fire(resizeHandle, 'track', {
+          state: 'track',
+          x,
+          y: minSizeIncreaseY + i,
+          dx: 0,
+          dy: minSizeIncreaseDelta + i,
+          ddx: 0,
+          ddy: 1,
+        });
+        await nextFrame();
+        const newHeight = getElementFromCell(dashboard, 0, 1)!.offsetHeight;
+        expect(newHeight >= previousHeight).to.be.true;
+        previousHeight = newHeight;
+      }
+    });
+
+    it('should resize only when dragged in the same direction (bottom -> top)', async () => {
+      setMinimumRowHeight(dashboard, 50);
+      dashboard.items = [{ id: 0, rowspan: 2 }, { id: 1 }, { id: 2, rowspan: 3 }];
+      await nextFrame();
+
+      const widget = getElementFromCell(dashboard, 2, 1)!;
+      const initialHeight = widget.offsetHeight;
+      fireResizeStart(widget);
+      await nextFrame();
+
+      const targetElement = getElementFromCell(dashboard, 1, 1)!;
+      const { x, y } = getEventCoordinates(targetElement, 'top');
+      const minSizeDecreaseDelta = initialHeight / 3 + 1;
+      const minSizeDecreaseY = y - minSizeDecreaseDelta;
+      const event = new MouseEvent('mousemove', {
+        bubbles: true,
+        composed: true,
+        clientX: x,
+        clientY: minSizeDecreaseY,
+        buttons: 1,
+      });
+      targetElement.dispatchEvent(event);
+      await nextFrame();
+
+      let previousHeight = initialHeight;
+      const resizeHandle = getResizeHandle(widget);
+
+      for (let i = 1; i < 5; i++) {
+        fire(resizeHandle, 'track', {
+          state: 'track',
+          x,
+          y: minSizeDecreaseY - i,
+          dx: 0,
+          dy: minSizeDecreaseDelta - i,
+          ddx: 0,
+          ddy: -1,
+        });
+        await nextFrame();
+        const newHeight = getElementFromCell(dashboard, 1, 1)!.offsetHeight;
+        expect(newHeight <= previousHeight).to.be.true;
+        previousHeight = newHeight;
+      }
+    });
+
     it('should dispatch an item resized event', async () => {
       const resizeEndSpy = sinon.spy();
       dashboard.addEventListener('dashboard-item-resized', resizeEndSpy);

packages/dashboard/test/helpers.ts

@@ -229,7 +229,10 @@ export function createDragEvent(type: string, { x, y }: { x: number; y: number }
   return event;
 }
 
-function getEventCoordinates(relativeElement: Element, location: 'top' | 'bottom' | 'start' | 'end') {
+export function getEventCoordinates(
+  relativeElement: Element,
+  location: 'top' | 'bottom' | 'start' | 'end',
+): { x: number; y: number } {
   const { top, bottom, left, right } = relativeElement.getBoundingClientRect();
   const y = location === 'top' ? top : bottom;
   const dir = document.dir;