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import * as React from "react";
import { deepEqual } from "fast-equals";
import clsx from "clsx";
import {
bottom,
childrenEqual,
cloneLayout,
cloneLayoutItem,
compact,
compactType,
fastRGLPropsEqual,
getAllCollisions,
getLayoutItem,
moveElement,
noop,
recursivelyMoveItemsUp,
synchronizeLayoutWithChildren,
withLayoutItem
} from "./utils";
import { calcXY } from "./calculateUtils";
import GridItem from "./GridItem";
import ReactGridLayoutPropTypes from "./ReactGridLayoutPropTypes";
import type {
ChildrenArray as ReactChildrenArray,
Element as ReactElement
} from "react";
// Types
import type {
CompactType,
GridResizeEvent,
GridDragEvent,
DragOverEvent,
Layout,
DroppingPosition,
LayoutItem
} from "./utils";
import type { PositionParams } from "./calculateUtils";
type State = {
activeDrag: ?LayoutItem,
layout: Layout,
mounted: boolean,
oldDragItem: ?LayoutItem,
oldLayout: ?Layout,
oldResizeItem: ?LayoutItem,
resizing: boolean,
droppingDOMNode: ?ReactElement<any>,
droppingPosition?: DroppingPosition,
// Mirrored props
children: ReactChildrenArray<ReactElement<any>>,
compactType?: CompactType,
propsLayout?: Layout
};
import type { Props, DefaultProps } from "./ReactGridLayoutPropTypes";
// End Types
const layoutClassName = "react-grid-layout";
let isFirefox = false;
// Try...catch will protect from navigator not existing (e.g. node) or a bad implementation of navigator
try {
isFirefox = /firefox/i.test(navigator.userAgent);
} catch (e) {
/* Ignore */
}
/**
* A reactive, fluid grid layout with draggable, resizable components.
*/
export default class ReactGridLayout extends React.Component<Props, State> {
// TODO publish internal ReactClass displayName transform
static displayName: ?string = "ReactGridLayout";
// Refactored to another module to make way for preval
static propTypes = ReactGridLayoutPropTypes;
static defaultProps: DefaultProps = {
autoSize: true,
cols: 12,
className: "",
style: {},
draggableHandle: "",
draggableCancel: "",
containerPadding: null,
rowHeight: 150,
maxRows: Infinity, // infinite vertical growth
layout: [],
margin: [10, 10],
isBounded: false,
isDraggable: true,
isResizable: true,
allowOverlap: false,
isDroppable: false,
useCSSTransforms: true,
transformScale: 1,
verticalCompact: true,
compactType: "vertical",
preventCollision: false,
droppingItem: {
i: "__dropping-elem__",
h: 1,
w: 1
},
resizeHandles: ["se"],
onLayoutChange: noop,
onDragStart: noop,
onDrag: noop,
onDragStop: noop,
onResizeStart: noop,
onResize: noop,
onResizeStop: noop,
onDrop: noop,
onDropDragOver: noop
};
state: State = {
activeDrag: null,
layout: synchronizeLayoutWithChildren(
this.props.layout,
this.props.children,
this.props.cols,
// Legacy support for verticalCompact: false
compactType(this.props),
this.props.allowOverlap
),
mounted: false,
oldDragItem: null,
oldLayout: null,
oldResizeItem: null,
resizing: false,
droppingDOMNode: null,
children: []
};
dragEnterCounter: number = 0;
componentDidMount() {
this.setState({ mounted: true });
// Possibly call back with layout on mount. This should be done after correcting the layout width
// to ensure we don't rerender with the wrong width.
this.onLayoutMaybeChanged(this.state.layout, this.props.layout);
}
static getDerivedStateFromProps(
nextProps: Props,
prevState: State
): $Shape<State> | null {
let newLayoutBase;
if (prevState.activeDrag) {
return null;
}
// Legacy support for compactType
// Allow parent to set layout directly.
if (
!deepEqual(nextProps.layout, prevState.propsLayout) ||
nextProps.compactType !== prevState.compactType
) {
newLayoutBase = nextProps.layout;
} else Iif (!childrenEqual(nextProps.children, prevState.children)) {
// If children change, also regenerate the layout. Use our state
// as the base in case because it may be more up to date than
// what is in props.
newLayoutBase = prevState.layout;
}
// We need to regenerate the layout.
if (newLayoutBase) {
const newLayout = synchronizeLayoutWithChildren(
newLayoutBase,
nextProps.children,
nextProps.cols,
compactType(nextProps),
nextProps.allowOverlap
);
return {
layout: newLayout,
// We need to save these props to state for using
// getDerivedStateFromProps instead of componentDidMount (in which we would get extra rerender)
compactType: nextProps.compactType,
children: nextProps.children,
propsLayout: nextProps.layout
};
}
return null;
}
shouldComponentUpdate(nextProps: Props, nextState: State): boolean {
return (
// NOTE: this is almost always unequal. Therefore the only way to get better performance
// from SCU is if the user intentionally memoizes children. If they do, and they can
// handle changes properly, performance will increase.
this.props.children !== nextProps.children ||
!fastRGLPropsEqual(this.props, nextProps, deepEqual) ||
this.state.activeDrag !== nextState.activeDrag ||
this.state.mounted !== nextState.mounted ||
this.state.droppingPosition !== nextState.droppingPosition
);
}
componentDidUpdate(prevProps: Props, prevState: State) {
if (!this.state.activeDrag) {
const newLayout = this.state.layout;
const oldLayout = prevState.layout;
this.onLayoutMaybeChanged(newLayout, oldLayout);
}
}
/**
* Calculates a pixel value for the container.
* @return {String} Container height in pixels.
*/
containerHeight(): ?string {
Iif (!this.props.autoSize) return;
const nbRow = bottom(this.state.layout);
const containerPaddingY = this.props.containerPadding
? this.props.containerPadding[1]
: this.props.margin[1];
return (
nbRow * this.props.rowHeight +
(nbRow - 1) * this.props.margin[1] +
containerPaddingY * 2 +
"px"
);
}
/**
* When dragging starts
* @param {String} i Id of the child
* @param {Number} x X position of the move
* @param {Number} y Y position of the move
* @param {Event} e The mousedown event
* @param {Element} node The current dragging DOM element
*/
onDragStart: (i: string, x: number, y: number, GridDragEvent) => void = (
i: string,
x: number,
y: number,
{ e, node }: GridDragEvent
) => {
const { layout } = this.state;
const l = getLayoutItem(layout, i);
Iif (!l) return;
// Create placeholder (display only)
const placeholder = {
w: l.w,
h: l.h,
x: l.x,
y: l.y,
placeholder: true,
i: i
};
this.setState({
oldDragItem: cloneLayoutItem(l),
oldLayout: layout,
activeDrag: placeholder
});
return this.props.onDragStart(layout, l, l, null, e, node);
};
/**
* Each drag movement create a new dragelement and move the element to the dragged location
* @param {String} i Id of the child
* @param {Number} x X position of the move
* @param {Number} y Y position of the move
* @param {Event} e The mousedown event
* @param {Element} node The current dragging DOM element
*/
onDrag: (i: string, x: number, y: number, GridDragEvent) => void = (
i,
x,
y,
{ e, node }
) => {
const { oldDragItem } = this.state;
let { layout } = this.state;
const { cols, allowOverlap, preventCollision } = this.props;
const l = getLayoutItem(layout, i);
Iif (!l) return;
// Create placeholder (display only)
const placeholder = {
w: l.w,
h: l.h,
x: l.x,
y: l.y,
placeholder: true,
i: i
};
// Move the element to the dragged location.
const isUserAction = true;
layout = moveElement(
layout,
l,
x,
y,
isUserAction,
preventCollision,
compactType(this.props),
cols,
allowOverlap
);
this.props.onDrag(layout, oldDragItem, l, placeholder, e, node);
this.setState({
layout: allowOverlap
? layout
: compact(layout, compactType(this.props), cols),
activeDrag: placeholder
});
};
/**
* When dragging stops, figure out which position the element is closest to and update its x and y.
* @param {String} i Index of the child.
* @param {Number} x X position of the move
* @param {Number} y Y position of the move
* @param {Event} e The mousedown event
* @param {Element} node The current dragging DOM element
*/
onDragStop: (i: string, x: number, y: number, GridDragEvent) => void = (
i,
x,
y,
{ e, node }
) => {
Iif (!this.state.activeDrag) return;
const { oldDragItem } = this.state;
let { layout } = this.state;
const { cols, preventCollision, allowOverlap } = this.props;
const l = getLayoutItem(layout, i);
Iif (!l) return;
// Move the element here
let savedLayout = cloneLayout(layout);
const isUserAction = true;
let layoutNew = moveElement(
layout,
l,
x,
y,
isUserAction,
preventCollision,
compactType(this.props),
cols,
allowOverlap
);
// Set state
let newLayout = allowOverlap
? layoutNew
: compact(layoutNew, compactType(this.props), cols);
// Custom collision handling logic for smart positioning
const currentCompactType = compactType(this.props);
Iif (!allowOverlap && !['horizontal', 'vertical'].includes(currentCompactType)) {
let foundEntry = null;
let newEntry = newLayout.filter(el => el.i == l.i)[0];
// Look for elements that are directly below the dropped element
for (let idx = 0; idx < newLayout.length; idx++) {
let curEntry = newLayout[idx];
if (((curEntry.x < (newEntry.x + newEntry.w) && curEntry.x >= newEntry.x) ||
(newEntry.x < (curEntry.x + curEntry.w) && newEntry.x >= curEntry.x)) &&
(curEntry.y + curEntry.h) == newEntry.y) {
foundEntry = curEntry;
}
}
if (foundEntry) {
let oldEntry = savedLayout.filter(el => el.i == foundEntry.i)[0];
// If the element was pushed down by exactly 1 unit, try to move it back up
if (oldEntry && (oldEntry.y + 1 == foundEntry.y)) {
foundEntry.y = foundEntry.y - 1;
recursivelyMoveItemsUp(foundEntry, newLayout);
}
}
}
this.props.onDragStop(newLayout, oldDragItem, l, null, e, node);
const { oldLayout } = this.state;
this.setState({
activeDrag: null,
layout: newLayout,
oldDragItem: null,
oldLayout: null
});
this.onLayoutMaybeChanged(newLayout, oldLayout);
};
onLayoutMaybeChanged(newLayout: Layout, oldLayout: ?Layout) {
Iif (!oldLayout) oldLayout = this.state.layout;
if (!deepEqual(oldLayout, newLayout)) {
this.props.onLayoutChange(newLayout);
}
}
onResizeStart: (i: string, w: number, h: number, GridResizeEvent) => void = (
i,
w,
h,
{ e, node }
) => {
const { layout } = this.state;
const l = getLayoutItem(layout, i);
Iif (!l) return;
this.setState({
oldResizeItem: cloneLayoutItem(l),
oldLayout: this.state.layout,
resizing: true
});
this.props.onResizeStart(layout, l, l, null, e, node);
};
onResize: (i: string, w: number, h: number, GridResizeEvent) => void = (
i,
w,
h,
{ e, node, size, handle }
) => {
const { oldResizeItem } = this.state;
const { layout } = this.state;
const { cols, preventCollision, allowOverlap } = this.props;
let shouldMoveItem = false;
let finalLayout;
let x;
let y;
const [newLayout, l] = withLayoutItem(layout, i, l => {
let hasCollisions;
x = l.x;
y = l.y;
if (["sw", "w", "nw", "n", "ne"].indexOf(handle) !== -1) {
if (["sw", "nw", "w"].indexOf(handle) !== -1) {
x = l.x + (l.w - w);
w = l.x !== x && x < 0 ? l.w : w;
x = x < 0 ? 0 : x;
}
if (["ne", "n", "nw"].indexOf(handle) !== -1) {
y = l.y + (l.h - h);
h = l.y !== y && y < 0 ? l.h : h;
y = y < 0 ? 0 : y;
}
shouldMoveItem = true;
}
// Something like quad tree should be used
// to find collisions faster
if (preventCollision && !allowOverlap) {
const collisions = getAllCollisions(layout, {
...l,
w,
h,
x,
y
}).filter(layoutItem => layoutItem.i !== l.i);
hasCollisions = collisions.length > 0;
// If we're colliding, we need adjust the placeholder.
if (hasCollisions) {
// Reset layoutItem dimensions if there were collisions
y = l.y;
h = l.h;
x = l.x;
w = l.w;
shouldMoveItem = false;
}
}
l.w = w;
l.h = h;
return l;
});
// Shouldn't ever happen, but typechecking makes it necessary
Iif (!l) return;
finalLayout = newLayout;
if (shouldMoveItem) {
// Move the element to the new position.
const isUserAction = true;
finalLayout = moveElement(
newLayout,
l,
x,
y,
isUserAction,
this.props.preventCollision,
compactType(this.props),
cols,
allowOverlap
);
}
// Create placeholder element (display only)
const placeholder = {
w: l.w,
h: l.h,
x: l.x,
y: l.y,
static: true,
i: i
};
this.props.onResize(finalLayout, oldResizeItem, l, placeholder, e, node);
// Re-compact the newLayout and set the drag placeholder.
this.setState({
layout: allowOverlap
? finalLayout
: compact(finalLayout, compactType(this.props), cols),
activeDrag: placeholder
});
};
onResizeStop: (i: string, w: number, h: number, GridResizeEvent) => void = (
i,
w,
h,
{ e, node }
) => {
const { layout, oldResizeItem } = this.state;
const { cols, allowOverlap } = this.props;
const l = getLayoutItem(layout, i);
// Set state
const newLayout = allowOverlap
? layout
: compact(layout, compactType(this.props), cols);
this.props.onResizeStop(newLayout, oldResizeItem, l, null, e, node);
const { oldLayout } = this.state;
this.setState({
activeDrag: null,
layout: newLayout,
oldResizeItem: null,
oldLayout: null,
resizing: false
});
this.onLayoutMaybeChanged(newLayout, oldLayout);
};
/**
* Create a placeholder object.
* @return {Element} Placeholder div.
*/
placeholder(): ?ReactElement<any> {
const { activeDrag } = this.state;
if (!activeDrag) return null;
const {
width,
cols,
margin,
containerPadding,
rowHeight,
maxRows,
useCSSTransforms,
transformScale
} = this.props;
// {...this.state.activeDrag} is pretty slow, actually
return (
<GridItem
w={activeDrag.w}
h={activeDrag.h}
x={activeDrag.x}
y={activeDrag.y}
i={activeDrag.i}
className={`react-grid-placeholder ${
this.state.resizing ? "placeholder-resizing" : ""
}`}
containerWidth={width}
cols={cols}
margin={margin}
containerPadding={containerPadding || margin}
maxRows={maxRows}
rowHeight={rowHeight}
isDraggable={false}
isResizable={false}
isBounded={false}
useCSSTransforms={useCSSTransforms}
transformScale={transformScale}
>
<div />
</GridItem>
);
}
/**
* Given a grid item, set its style attributes & surround in a <Draggable>.
* @param {Element} child React element.
* @return {Element} Element wrapped in draggable and properly placed.
*/
processGridItem(
child: ReactElement<any>,
isDroppingItem?: boolean
): ?ReactElement<any> {
if (!child || !child.key) return;
const l = getLayoutItem(this.state.layout, String(child.key));
Iif (!l) return null;
const {
width,
cols,
margin,
containerPadding,
rowHeight,
maxRows,
isDraggable,
isResizable,
isBounded,
useCSSTransforms,
transformScale,
draggableCancel,
draggableHandle,
resizeHandles,
resizeHandle
} = this.props;
const { mounted, droppingPosition } = this.state;
// Determine user manipulations possible.
// If an item is static, it can't be manipulated by default.
// Any properties defined directly on the grid item will take precedence.
const draggable =
typeof l.isDraggable === "boolean"
? l.isDraggable
: !l.static && isDraggable;
const resizable =
typeof l.isResizable === "boolean"
? l.isResizable
: !l.static && isResizable;
const resizeHandlesOptions = l.resizeHandles || resizeHandles;
// isBounded set on child if set on parent, and child is not explicitly false
const bounded = draggable && isBounded && l.isBounded !== false;
return (
<GridItem
containerWidth={width}
cols={cols}
margin={margin}
containerPadding={containerPadding || margin}
maxRows={maxRows}
rowHeight={rowHeight}
cancel={draggableCancel}
handle={draggableHandle}
onDragStop={this.onDragStop}
onDragStart={this.onDragStart}
onDrag={this.onDrag}
onResizeStart={this.onResizeStart}
onResize={this.onResize}
onResizeStop={this.onResizeStop}
isDraggable={draggable}
isResizable={resizable}
isBounded={bounded}
useCSSTransforms={useCSSTransforms && mounted}
usePercentages={!mounted}
transformScale={transformScale}
w={l.w}
h={l.h}
x={l.x}
y={l.y}
i={l.i}
minH={l.minH}
minW={l.minW}
maxH={l.maxH}
maxW={l.maxW}
static={l.static}
droppingPosition={isDroppingItem ? droppingPosition : undefined}
resizeHandles={resizeHandlesOptions}
resizeHandle={resizeHandle}
>
{child}
</GridItem>
);
}
// Called while dragging an element. Part of browser native drag/drop API.
// Native event target might be the layout itself, or an element within the layout.
onDragOver: DragOverEvent => void | false = e => {
e.preventDefault(); // Prevent any browser native action
e.stopPropagation();
// we should ignore events from layout's children in Firefox
// to avoid unpredictable jumping of a dropping placeholder
// FIXME remove this hack
Iif (
isFirefox &&
// $FlowIgnore can't figure this out
!e.nativeEvent.target?.classList.contains(layoutClassName)
) {
return false;
}
const {
droppingItem,
onDropDragOver,
margin,
cols,
rowHeight,
maxRows,
width,
containerPadding,
transformScale
} = this.props;
// Allow user to customize the dropping item or short-circuit the drop based on the results
// of the `onDragOver(e: Event)` callback.
const onDragOverResult = onDropDragOver?.(e);
if (onDragOverResult === false) {
Iif (this.state.droppingDOMNode) {
this.removeDroppingPlaceholder();
}
return false;
}
const finalDroppingItem = { ...droppingItem, ...onDragOverResult };
const { layout } = this.state;
// $FlowIgnore missing def
const gridRect = e.currentTarget.getBoundingClientRect(); // The grid's position in the viewport
// Calculate the mouse position relative to the grid
const layerX = e.clientX - gridRect.left;
const layerY = e.clientY - gridRect.top;
const droppingPosition = {
left: layerX / transformScale,
top: layerY / transformScale,
e
};
if (!this.state.droppingDOMNode) {
const positionParams: PositionParams = {
cols,
margin,
maxRows,
rowHeight,
containerWidth: width,
containerPadding: containerPadding || margin
};
const calculatedPosition = calcXY(
positionParams,
layerY,
layerX,
finalDroppingItem.w,
finalDroppingItem.h
);
this.setState({
droppingDOMNode: <div key={finalDroppingItem.i} />,
droppingPosition,
layout: [
...layout,
{
...finalDroppingItem,
x: calculatedPosition.x,
y: calculatedPosition.y,
static: false,
isDraggable: true
}
]
});
} else Eif (this.state.droppingPosition) {
const { left, top } = this.state.droppingPosition;
const shouldUpdatePosition = left != layerX || top != layerY;
Eif (shouldUpdatePosition) {
this.setState({ droppingPosition });
}
}
};
removeDroppingPlaceholder: () => void = () => {
const { droppingItem, cols } = this.props;
const { layout } = this.state;
const newLayout = compact(
layout.filter(l => l.i !== droppingItem.i),
compactType(this.props),
cols,
this.props.allowOverlap
);
this.setState({
layout: newLayout,
droppingDOMNode: null,
activeDrag: null,
droppingPosition: undefined
});
};
onDragLeave: EventHandler = e => {
e.preventDefault(); // Prevent any browser native action
e.stopPropagation();
this.dragEnterCounter--;
// onDragLeave can be triggered on each layout's child.
// But we know that count of dragEnter and dragLeave events
// will be balanced after leaving the layout's container
// so we can increase and decrease count of dragEnter and
// when it'll be equal to 0 we'll remove the placeholder
if (this.dragEnterCounter === 0) {
this.removeDroppingPlaceholder();
}
};
onDragEnter: EventHandler = e => {
e.preventDefault(); // Prevent any browser native action
e.stopPropagation();
this.dragEnterCounter++;
};
onDrop: EventHandler = (e: Event) => {
e.preventDefault(); // Prevent any browser native action
e.stopPropagation();
const { droppingItem } = this.props;
const { layout } = this.state;
const item = layout.find(l => l.i === droppingItem.i);
// reset dragEnter counter on drop
this.dragEnterCounter = 0;
this.removeDroppingPlaceholder();
this.props.onDrop(layout, item, e);
};
render(): React.Element<"div"> {
const { className, style, isDroppable, innerRef } = this.props;
const mergedClassName = clsx(layoutClassName, className);
const mergedStyle = {
height: this.containerHeight(),
...style
};
return (
<div
ref={innerRef}
className={mergedClassName}
style={mergedStyle}
onDrop={isDroppable ? this.onDrop : noop}
onDragLeave={isDroppable ? this.onDragLeave : noop}
onDragEnter={isDroppable ? this.onDragEnter : noop}
onDragOver={isDroppable ? this.onDragOver : noop}
>
{React.Children.map(this.props.children, child =>
this.processGridItem(child)
)}
{isDroppable &&
this.state.droppingDOMNode &&
this.processGridItem(this.state.droppingDOMNode, true)}
{this.placeholder()}
</div>
);
}
}
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