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import React from 'react';
import type {Node as ReactNode} from 'react';
import {DraggableCore} from 'react-draggable';
import {cloneElement} from './utils';
import {resizableProps} from "./propTypes";
import type {ResizeHandleAxis, Props, ResizableState, DragCallbackData} from './propTypes';
export default class Resizable extends React.Component<Props, ResizableState> {
static propTypes = resizableProps;
static defaultProps = {
handleSize: [20, 20],
lockAspectRatio: false,
axis: 'both',
minConstraints: [20, 20],
maxConstraints: [Infinity, Infinity],
resizeHandles: ['se'],
transformScale: 1
};
state: ResizableState = undefined;
lastHandleRect: ?ClientRect = null;
slack: ?[number, number] = null;
componentWillUnmount() {
this.resetData();
}
lockAspectRatio(width: number, height: number, aspectRatio: number): [number, number] {
height = width / aspectRatio;
width = height * aspectRatio;
return [width, height];
}
resetData() {
this.lastHandleRect = this.slack = null;
}
// Clamp width and height within provided constraints
runConstraints(width: number, height: number): [number, number] {
const [min, max] = [this.props.minConstraints, this.props.maxConstraints];
Iif (!min && !max) return [width, height];
// If constraining to min and max, we need to also fit width and height to aspect ratio.
Iif (this.props.lockAspectRatio) {
const resizingHorizontally = height === this.props.height;
if (resizingHorizontally) {
const ratio = this.props.width / this.props.height;
height = width / ratio;
width = height * ratio;
} else {
// Take into account vertical resize with N/S handles on locked aspect
// ratio. Calculate the change height-first, instead of width-first
const ratio = this.props.height / this.props.width;
width = height / ratio;
height = width * ratio;
}
}
const [oldW, oldH] = [width, height];
// Add slack to the values used to calculate bound position. This will ensure that if
// we start removing slack, the element won't react to it right away until it's been
// completely removed.
let [slackW, slackH] = this.slack || [0, 0];
width += slackW;
height += slackH;
Eif (min) {
width = Math.max(min[0], width);
height = Math.max(min[1], height);
}
Eif (max) {
width = Math.min(max[0], width);
height = Math.min(max[1], height);
}
// If the width or height changed, we must have introduced some slack. Record it for the next iteration.
this.slack = [slackW + (oldW - width), slackH + (oldH - height)];
return [width, height];
}
/**
* Wrapper around drag events to provide more useful data.
*
* @param {String} handlerName Handler name to wrap.
* @return {Function} Handler function.
*/
resizeHandler(handlerName: 'onResize' | 'onResizeStart' | 'onResizeStop', axis: ResizeHandleAxis): Function {
return (e: SyntheticEvent<>, {node, deltaX, deltaY}: DragCallbackData) => {
// Reset data in case it was left over somehow (should not be possible)
Iif (handlerName === 'onResizeStart') this.resetData();
// Axis restrictions
const canDragX = (this.props.axis === 'both' || this.props.axis === 'x') && axis !== 'n' && axis !== 's';
const canDragY = (this.props.axis === 'both' || this.props.axis === 'y') && axis !== 'e' && axis !== 'w';
// No dragging possible.
Iif (!canDragX && !canDragY) return;
// Decompose axis for later use
const axisV = axis[0];
const axisH = axis[axis.length - 1]; // intentionally not axis[1], so that this catches axis === 'w' for example
// Track the element being dragged to account for changes in position.
// If a handle's position is changed between callbacks, we need to factor this in to the next callback.
// Failure to do so will cause the element to "skip" when resized upwards or leftwards.
const handleRect = node.getBoundingClientRect();
if (this.lastHandleRect != null) {
// If the handle has repositioned on either axis since last render,
// we need to increase our callback values by this much.
// Only checking 'n', 'w' since resizing by 's', 'w' won't affect the overall position on page,
if (axisH === 'w') {
const deltaLeftSinceLast = handleRect.left - this.lastHandleRect.left;
deltaX += deltaLeftSinceLast;
}
if (axisV === 'n') {
const deltaTopSinceLast = handleRect.top - this.lastHandleRect.top;
deltaY += deltaTopSinceLast;
}
}
// Storage of last rect so we know how much it has really moved.
this.lastHandleRect = handleRect;
// Reverse delta if using top or left drag handles.
if (axisH === 'w') deltaX = -deltaX;
if (axisV === 'n') deltaY = -deltaY;
// Update w/h by the deltas. Also factor in transformScale.
let width = this.props.width + (canDragX ? deltaX / this.props.transformScale : 0);
let height = this.props.height + (canDragY ? deltaY / this.props.transformScale : 0);
// Run user-provided constraints.
[width, height] = this.runConstraints(width, height);
const dimensionsChanged = width !== this.props.width || height !== this.props.height;
// Call user-supplied callback if present.
const cb = typeof this.props[handlerName] === 'function' ? this.props[handlerName] : null;
// Don't call 'onResize' if dimensions haven't changed.
const shouldSkipCb = handlerName === 'onResize' && !dimensionsChanged;
if (cb && !shouldSkipCb) {
Iif (typeof e.persist === 'function') e.persist();
cb(e, {node, size: {width, height}, handle: axis});
}
// Reset internal data
Iif (handlerName === 'onResizeStop') this.resetData();
};
}
renderResizeHandle(resizeHandleAxis: ResizeHandleAxis): ReactNode {
const {handle} = this.props;
if (handle) {
if (typeof handle === 'function') {
return handle(resizeHandleAxis);
}
return handle;
}
return <span className={`react-resizable-handle react-resizable-handle-${resizeHandleAxis}`} />;
}
render(): ReactNode {
// Pass along only props not meant for the `<Resizable>`.`
// eslint-disable-next-line no-unused-vars
const {children, className, draggableOpts, width, height, handle, handleSize,
lockAspectRatio, axis, minConstraints, maxConstraints, onResize,
onResizeStop, onResizeStart, resizeHandles, transformScale, ...p} = this.props;
// What we're doing here is getting the child of this element, and cloning it with this element's props.
// We are then defining its children as:
// Its original children (resizable's child's children), and
// One or more draggable handles.
return cloneElement(children, {
...p,
className: `${className ? `${className} ` : ''}react-resizable`,
children: [
...children.props.children,
...resizeHandles.map((handleAxis) => (
<DraggableCore
{...draggableOpts}
key={`resizableHandle-${handleAxis}`}
onStop={this.resizeHandler('onResizeStop', handleAxis)}
onStart={this.resizeHandler('onResizeStart', handleAxis)}
onDrag={this.resizeHandler('onResize', handleAxis)}
>
{this.renderResizeHandle(handleAxis)}
</DraggableCore>
))
]
});
}
}
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