alexandrusoare commented on code in PR #45090: URL: https://github.com/apache/superset/pull/45090#discussion_r4359138959
########## superset-frontend/src/features/canvas/CanvasGridSurface.tsx: ########## @@ -0,0 +1,792 @@ +/** + * Licensed to the Apache Software Foundation (ASF) under one + * or more contributor license agreements. See the NOTICE file + * distributed with this work for additional information + * regarding copyright ownership. The ASF licenses this file + * to you under the Apache License, Version 2.0 (the + * "License"); you may not use this file except in compliance + * with the License. You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, + * software distributed under the License is distributed on an + * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY + * KIND, either express or implied. See the License for the + * specific language governing permissions and limitations + * under the License. + */ + +/** + * @fileoverview One grid of a canvas, with drag and resize built in. + * + * There is no edit mode: a user who may edit gets a drag grip and a resize + * corner on each widget, on the canvas as they view it. A user who may not + * gets the same grid with no handles. Dragging never covers the widget's own + * surface, so a filter or chart underneath stays clickable. + * + * While a gesture is live the widget follows the pointer and a dashed outline + * marks the cells it would take; releasing persists exactly those cells. + */ + +import { + PointerEvent as ReactPointerEvent, + KeyboardEvent as ReactKeyboardEvent, + ReactNode, + useCallback, + useEffect, + useRef, + useState, +} from 'react'; +import { css, styled } from '@apache-superset/core/theme'; +import { t } from '@apache-superset/core/translation'; +import { Icons } from '@superset-ui/core/components'; +import { + GridMetrics, + gridDelta, + movedPlacement, + NO_DELTA, + RESIZE_CORNERS, + type ResizeCorner, + resizedPlacement, + samePlacement, +} from './gridGeometry'; +import { previewGrid, type GridLayout } from './resolveGrid'; +import type { GridPlacement, SpanConstraints } from './types'; + +type GestureKind = 'move' | 'resize'; + +interface Gesture { + nodeId: string; + kind: GestureKind; + pointerId: number; + startX: number; + startY: number; + /** + * Page scroll when the widget was grabbed. Pointer coordinates are relative + * to the viewport, so scrolling mid-gesture moves the content under a still + * pointer; without this the drag would report no movement at all. + */ + startScrollX: number; + startScrollY: number; + dx: number; + dy: number; + /** + * Where the widget sat when it was grabbed. The gesture resolves against + * this, not against the current placement: a write landing mid-gesture (a + * sibling's drop pushing this one down, or a draft poll) would otherwise + * move the ground under the pointer and persist the drop relative to a row + * the user never aimed at. + */ + origin: GridPlacement; + /** + * Whether this gesture is actually dragging yet. One begun on a handle is + * armed at once; one begun on the widget body waits until the pointer has + * travelled `DRAG_THRESHOLD`, so a press that turns out to be a click + * reaches the widget underneath instead of nudging it. + */ + armed: boolean; + /** + * The element the press landed on, so a gesture that arms later can take + * the pointer from it. Held rather than looked up when it arms: by then the + * pointer may be over something else entirely. + */ + capture: HTMLElement; + /** For a resize, the corner being dragged; the opposite one stays put. */ + corner: ResizeCorner; +} + +/** Pixels of travel before a press on a widget body becomes a drag. */ +const DRAG_THRESHOLD = 4; + +/** + * Presses already claimed by a grid, so one that bubbles through nested grids + * starts exactly one gesture: the innermost grid's. + */ +const claimedPresses = new WeakSet<Event>(); + +/** + * Controls that handle press-and-drag themselves, so a press on one must not + * also move the widget: a filter's slider, a form control, a link, a handle + * for reordering something inside a widget. `data-canvas-no-drag` lets a + * widget opt anything else out. + */ +const OWN_GESTURE = [ + 'input', + 'textarea', + 'select', + 'button', + 'a[href]', + '[role="slider"]', + '[role="button"]', + '[role="scrollbar"]', + '[contenteditable=""]', + '[contenteditable="true"]', + '[draggable="true"]', + '[data-canvas-no-drag]', +].join(','); + +/** + * Whether a press landed on a scrollbar rather than inside the content. + * + * A scrollbar belongs to the element it scrolls and dragging it scrolls, so a + * widget tall enough to scroll -- a table, usually -- would otherwise be + * impossible to scroll by hand in a plan. `clientWidth`/`clientHeight` stop + * short of the scrollbar, so a press past either is on it; the comparison is + * skipped for an element that isn't overflowing, which has no scrollbar to + * press. A left-hand scrollbar (RTL) is not detected. + */ +const onScrollbar = ( + target: Element, + clientX: number, + clientY: number, +): boolean => { + const box = target.getBoundingClientRect(); + return ( + (target.scrollHeight > target.clientHeight && + clientX > box.left + target.clientWidth) || + (target.scrollWidth > target.clientWidth && + clientY > box.top + target.clientHeight) + ); +}; + +/** Whether something inside the widget owns this press, so the grid doesn't. */ +const ownsPress = (event: ReactPointerEvent<HTMLElement>): boolean => { + const { target } = event; + if (!(target instanceof Element)) return false; + const owner = target.closest(OWN_GESTURE); + // Bounded to this widget: a control that happens to sit above the grid in + // the page isn't what the press landed on. + return ( + (owner !== null && event.currentTarget.contains(owner)) || + onScrollbar(target, event.clientX, event.clientY) + ); +}; + +/** A gesture's movement over the page content, scrolling included. */ +const travelled = (gesture: Gesture, clientX: number, clientY: number) => ({ + dx: clientX - gesture.startX + (window.scrollX - gesture.startScrollX), + dy: clientY - gesture.startY + (window.scrollY - gesture.startScrollY), +}); + +const Grid = styled.div<GridMetrics>` + display: grid; + grid-template-columns: repeat(${({ columns }) => columns}, minmax(0, 1fr)); + grid-auto-rows: ${({ rowUnit }) => rowUnit}px; + gap: ${({ gap }) => gap}px; +`; + +const GridItem = styled.div<{ + placement?: GridPlacement; + dragging?: boolean; + offset?: { x: number; y: number }; +}>` + ${({ placement, dragging, offset }) => css` + min-width: 0; + min-height: 0; + position: relative; + ${ + placement && + css` + grid-column: ${placement.col} / span ${placement.colSpan}; + grid-row: ${placement.row} / span ${placement.rowSpan}; + ` + } + ${ + dragging && + offset && + css` + /* Follow the pointer without reflowing the grid under it. */ + transform: translate(${offset.x}px, ${offset.y}px); + z-index: 2; + opacity: 0.85; Review Comment: Thank you, used your suggestion -- This is an automated message from the Apache Git Service. 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