app/javascript/components/PageTree/Draggable.tsx
/*
Based on react-ui-tree
https://github.com/pqx/react-ui-tree
The MIT License (MIT)
Copyright (c) 2015 pqx Limited
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.
*/
import React, { Component } from "react";
import Tree, { TreeId, TreeIndex } from "../../lib/Tree";
import { Attributes, PageNode } from "./types";
import Node from "./Node";
interface DragState {
id: number | null;
x: number | null;
y: number | null;
w: number | null;
h: number | null;
scrollTop: number | null;
scrollLeft: number | null;
}
interface DraggableProps {
addChild: (index: TreeIndex) => void;
dir: string;
locale: string;
movedPage: (id: TreeId) => void;
paddingLeft: number;
toggleCollapsed: (id: TreeId) => void;
tree: Tree<PageNode>;
updatePage: (id: TreeId, attributes: Attributes) => void;
updateTree: (Tree) => void;
}
interface DraggableState {
dragging: DragState;
}
export default class Draggable extends Component<
DraggableProps,
DraggableState
> {
_dragListener: (evt: MouseEvent) => void;
_dragEndListener: () => void;
_startX: number;
_startY: number;
_offsetX: number;
_offsetY: number;
dragging: DragState;
constructor(props: DraggableProps) {
super(props);
this.state = {
dragging: this.initDragging()
};
}
initDragging(): DragState {
return {
id: null,
x: null,
y: null,
w: null,
h: null,
scrollTop: null,
scrollLeft: null
};
}
getDraggingDom() {
const tree = this.props.tree;
const dragging = this.state.dragging;
if (dragging && dragging.id) {
const draggingIndex = tree.getIndex(dragging.id);
const draggingStyles = {
top: dragging.y,
left: dragging.x,
width: dragging.w
};
return (
<div className="draggable" style={draggingStyles}>
<Node
tree={tree}
index={draggingIndex}
paddingLeft={this.props.paddingLeft}
/>
</div>
);
}
return null;
}
render() {
const { tree, dir, locale } = this.props;
const dragging = this.state.dragging;
if (!tree) {
return <div className="page-tree">{this.getDraggingDom()}</div>;
} else {
const root = tree.getIndex(1);
return (
<div className="page-tree">
{this.getDraggingDom()}
<Node
tree={tree}
index={root}
key={root.id}
paddingLeft={this.props.paddingLeft}
addChild={(id) => this.addChild(id)}
onDragStart={(id, dom, e) => this.dragStart(id, dom, e)}
onCollapse={(nodeId) => this.toggleCollapse(nodeId)}
updatePage={(idx, attrs) => this.updatePage(idx, attrs)}
dragging={dragging && dragging.id}
dir={dir}
locale={locale}
/>
</div>
);
}
}
addChild(parent: TreeIndex<PageNode>) {
const newNode = {
name: "",
status: 0,
editing: true,
children: [],
published_at: new Date(),
pinned: false,
locale: parent.node.locale,
parent_page_id: parent.node.id
};
this.props.addChild(parent.id, newNode);
}
prevAddButtonCount(tree: Tree, index: TreeIndex) {
let count = 0;
const parentNodes = [];
let pointer = tree.getIndex(index.parent);
while (pointer) {
parentNodes.push(pointer);
pointer = tree.getIndex(pointer.parent);
}
pointer = index;
pointer = tree.getNodeByTop(index.top - 1);
while (pointer) {
if (
parentNodes.indexOf(pointer) == -1 &&
!pointer.node.collapsed &&
pointer.node.children.filter((p) => p.status != 4).length > 0
) {
count += 1;
}
pointer = tree.getNodeByTop(pointer.top - 1);
}
return count;
}
scrollOffset() {
const dragging = this.state.dragging;
return {
top: document.body.scrollTop - dragging.scrollTop,
left: document.body.scrollLeft - dragging.scrollLeft
};
}
drag(e: MouseEvent) {
if (this._start) {
const distance =
Math.abs(e.clientX - this._offsetX) +
Math.abs(e.clientY - this._offsetY);
if (distance >= 15) {
this.setState({
dragging: this.dragging
});
this._start = false;
} else {
return null;
}
}
const tree = this.props.tree;
const dragging = this.state.dragging;
const paddingLeft = this.props.paddingLeft;
let newIndex: TreeIndex = null;
let index = tree.getIndex(dragging.id);
const collapsed = index.node.collapsed;
const _startX = this._startX;
const _startY = this._startY;
const _offsetX = this._offsetX;
const _offsetY = this._offsetY;
const pos = {
x: _startX + e.clientX - _offsetX + this.scrollOffset().left,
y: _startY + e.clientY - _offsetY + this.scrollOffset().top
};
dragging.x = pos.x;
dragging.y = pos.y;
const diffX = dragging.x - paddingLeft / 2 - (index.left - 2) * paddingLeft;
const diffY =
dragging.y -
dragging.h / 2 -
(index.top - 2 + this.prevAddButtonCount(tree, index)) * dragging.h;
if (diffX < 0) {
// left
if (index.parent && !index.next) {
newIndex = tree.move(index.id, index.parent, "after");
}
} else if (diffX > paddingLeft) {
// right
if ("prev" in index) {
const prev = tree.getIndex(index.prev);
if (!prev.node.leaf && !prev.node.collapsed) {
newIndex = tree.move(index.id, index.prev, "append");
}
}
}
if (newIndex) {
index = newIndex;
newIndex.node.collapsed = collapsed;
dragging.id = newIndex.id;
}
if (diffY < 0 - dragging.h * 0.5) {
// up
const above = tree.getNodeByTop(index.top - 1);
newIndex = tree.move(index.id, above.id, "before");
} else if (diffY > dragging.h * 1.5) {
// down
const below = index.next
? tree.getIndex(index.next)
: tree.getNodeByTop(index.top + index.height);
if (below && below.parent !== index.id) {
if (below.children && below.children.length && !below.node.collapsed) {
newIndex = tree.move(index.id, below.id, "prepend");
} else {
newIndex = tree.move(index.id, below.id, "after");
}
}
}
if (newIndex) {
newIndex.node.collapsed = collapsed;
dragging.id = newIndex.id;
}
this.setState({ dragging: dragging });
}
dragStart(id: TreeId, dom: HTMLDivElement, e: MouseEvent) {
// Only drag on left click
if (e.button !== 0) {
return;
}
this.dragging = {
id: id,
w: dom.offsetWidth,
h: dom.offsetHeight,
x: dom.offsetLeft,
y: dom.offsetTop,
scrollTop: document.body.scrollTop,
scrollLeft: document.body.scrollLeft
};
this._startX = dom.offsetLeft;
this._startY = dom.offsetTop;
this._offsetX = e.clientX;
this._offsetY = e.clientY;
this._start = true;
this._dragListener = (e: Event) => {
this.drag(e);
};
this._dragEndListener = () => this.dragEnd();
window.addEventListener("mousemove", this._dragListener);
window.addEventListener("mouseup", this._dragEndListener);
}
dragEnd() {
if (!this._start) {
this.props.updateTree(this.props.tree);
this.props.movedPage(this.state.dragging.id);
}
this.setState({
dragging: this.initDragging()
});
window.removeEventListener("mousemove", this._dragListener);
window.removeEventListener("mouseup", this._dragEndListener);
}
toggleCollapse(nodeId: TreeId) {
this.props.toggleCollapsed(nodeId);
}
updatePage(index: TreeIndex, attributes: Attributes) {
this.props.updatePage(index.id, attributes);
}
}
Draggable.defaultProps = {
paddingLeft: 15
};