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RectangleNodeLayoutHandler.ts
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RectangleNodeLayoutHandler.ts
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/*******************************************************************************
* Copyright (c) 2023 Obeo.
* This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v2.0
* which accompanies this distribution, and is available at
* https://www.eclipse.org/legal/epl-2.0/
*
* SPDX-License-Identifier: EPL-2.0
*
* Contributors:
* Obeo - initial API and implementation
*******************************************************************************/
import { Box, Node, Rect, boxToRect, rectToBox } from 'reactflow';
import { Diagram, NodeData } from '../DiagramRenderer.types';
import { DiagramNodeType } from '../node/NodeTypes.types';
import { RectangularNodeData } from '../node/RectangularNode.types';
import { ILayoutEngine, INodeLayoutHandler } from './LayoutEngine.types';
const gap = 20;
const rectangularNodePadding = 8;
const defaultWidth = 150;
const defaultHeight = 70;
export class RectangleNodeLayoutHandler implements INodeLayoutHandler<RectangularNodeData> {
public canHandle(node: Node<NodeData, DiagramNodeType>) {
return node.type === 'rectangularNode';
}
public handle(
layoutEngine: ILayoutEngine,
previousDiagram: Diagram | null,
node: Node<RectangularNodeData, 'rectangularNode'>,
visibleNodes: Node<NodeData, DiagramNodeType>[],
directChildren: Node<NodeData, DiagramNodeType>[],
forceWidth?: number
) {
const nodeIndex = this.findNodeIndex(visibleNodes, node.id);
const nodeElement = document.getElementById(`${node.id}-rectangularNode-${nodeIndex}`)?.children[0];
const borderWidth = nodeElement ? parseFloat(window.getComputedStyle(nodeElement).borderWidth) : 0;
if (directChildren.length > 0) {
this.handleParentNode(layoutEngine, previousDiagram, node, visibleNodes, directChildren, borderWidth, forceWidth);
} else {
this.handleLeafNode(previousDiagram, node, visibleNodes, borderWidth, forceWidth);
}
}
private handleParentNode(
layoutEngine: ILayoutEngine,
previousDiagram: Diagram | null,
node: Node<RectangularNodeData, 'rectangularNode'>,
visibleNodes: Node<NodeData, DiagramNodeType>[],
directChildren: Node<NodeData, DiagramNodeType>[],
borderWidth: number,
forceWidth?: number
) {
layoutEngine.layoutNodes(previousDiagram, visibleNodes, directChildren);
const nodeIndex = this.findNodeIndex(visibleNodes, node.id);
const labelElement = document.getElementById(`${node.id}-label-${nodeIndex}`);
// Update children position to be under the label and at the right padding.
directChildren.forEach((child, index) => {
child.position = {
x: borderWidth + rectangularNodePadding,
y:
borderWidth +
rectangularNodePadding +
(labelElement?.getBoundingClientRect().height ?? 0) +
rectangularNodePadding,
};
const previousSibling = directChildren[index - 1];
if (previousSibling) {
child.position = { ...child.position, x: previousSibling.position.x + (previousSibling.width ?? 0) + gap };
}
});
// Update node to layout size
// WARN: We suppose label are always on top of children (that wrong)
const childrenFootprint = this.getChildrenFootprint(directChildren);
const labelOnlyWidth = labelElement?.getBoundingClientRect().width ?? 0;
const nodeWidth = Math.max(childrenFootprint.width, labelOnlyWidth) + rectangularNodePadding * 2 + borderWidth * 2;
const nodeHeight =
rectangularNodePadding +
(labelElement?.getBoundingClientRect().height ?? 0) +
rectangularNodePadding +
childrenFootprint.height +
rectangularNodePadding +
borderWidth * 2;
node.width = forceWidth ?? this.getNodeOrMinWidth(nodeWidth);
node.height = this.getNodeOrMinHeight(nodeHeight);
}
private handleLeafNode(
previousDiagram: Diagram | null,
node: Node<RectangularNodeData, 'rectangularNode'>,
visibleNodes: Node<NodeData, DiagramNodeType>[],
borderWidth: number,
forceWidth?: number
) {
const nodeIndex = this.findNodeIndex(visibleNodes, node.id);
const labelElement = document.getElementById(`${node.id}-label-${nodeIndex}`);
const labelWidth =
rectangularNodePadding +
(labelElement?.getBoundingClientRect().width ?? 0) +
rectangularNodePadding +
borderWidth * 2;
const labelHeight =
rectangularNodePadding + (labelElement?.getBoundingClientRect().height ?? 0) + rectangularNodePadding;
node.width = forceWidth ?? this.getNodeOrMinWidth(labelWidth);
node.height = this.getNodeOrMinHeight(labelHeight);
const previousNode = (previousDiagram?.nodes ?? []).find((previousNode) => previousNode.id === node.id);
if (previousNode && previousNode.width && previousNode.height) {
node.width = previousNode.width;
node.height = previousNode.height;
}
}
private getChildrenFootprint(children: Node<NodeData>[]): Rect {
const footPrint: Box = children.reduce(
(currentFootPrint, node) => {
const { x, y } = node.position;
const nodeBox = rectToBox({
x,
y,
width: node.width ?? 0,
height: node.height ?? 0,
});
return this.getBoundsOfBoxes(currentFootPrint, nodeBox);
},
{ x: Infinity, y: Infinity, x2: -Infinity, y2: -Infinity }
);
return boxToRect(footPrint);
}
private getBoundsOfBoxes(box1: Box, box2: Box): Box {
return {
x: Math.min(box1.x, box2.x),
y: Math.min(box1.y, box2.y),
x2: Math.max(box1.x2, box2.x2),
y2: Math.max(box1.y2, box2.y2),
};
}
private findNodeIndex(nodes: Node<NodeData>[], nodeId: string): number {
return nodes.findIndex((node) => node.id === nodeId);
}
private getNodeOrMinWidth(nodeWidth: number | undefined): number {
return Math.max(nodeWidth ?? -Infinity, defaultWidth);
}
private getNodeOrMinHeight(nodeHeight: number | undefined): number {
return Math.max(nodeHeight ?? -Infinity, defaultHeight);
}
}