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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 { Node } 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';
import { getBorderNodeExtent } from './layoutBorderNodes';
import {
computeNodesBox,
findNodeIndex,
getChildNodePosition,
getEastBorderNodeFootprintHeight,
getNodeOrMinHeight,
getNodeOrMinWidth,
getNorthBorderNodeFootprintWidth,
getSouthBorderNodeFootprintWidth,
getWestBorderNodeFootprintHeight,
setBorderNodesPosition,
} from './layoutNode';
import { rectangularNodePadding } from './layoutParams';
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>[],
newlyAddedNode: Node<NodeData, DiagramNodeType> | undefined,
forceWidth?: number
) {
const nodeIndex = 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,
newlyAddedNode,
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>[],
newlyAddedNode: Node<NodeData, DiagramNodeType> | undefined,
borderWidth: number,
forceWidth?: number
) {
layoutEngine.layoutNodes(previousDiagram, visibleNodes, directChildren, newlyAddedNode);
const nodeIndex = findNodeIndex(visibleNodes, node.id);
const labelElement = document.getElementById(`${node.id}-label-${nodeIndex}`);
const withHeader: boolean = node.data.label?.isHeader ?? false;
const displayHeaderSeparator: boolean = node.data.label?.displayHeaderSeparator ?? false;
const borderNodes = directChildren.filter((node) => node.data.isBorderNode);
const directNodesChildren = directChildren.filter((child) => !child.data.isBorderNode);
// Update children position to be under the label and at the right padding.
directNodesChildren.forEach((child, index) => {
const previousNode = (previousDiagram?.nodes ?? []).find((previouseNode) => previouseNode.id === child.id);
const createdNode = newlyAddedNode?.id === child.id ? newlyAddedNode : undefined;
if (!!createdNode) {
child.position = createdNode.position;
} else if (previousNode) {
child.position = previousNode.position;
} else {
child.position = getChildNodePosition(
visibleNodes,
child,
labelElement,
withHeader,
displayHeaderSeparator,
borderWidth
);
const previousSibling = directNodesChildren[index - 1];
if (previousSibling) {
child.position = getChildNodePosition(
visibleNodes,
child,
labelElement,
withHeader,
displayHeaderSeparator,
borderWidth,
previousSibling
);
}
}
});
// Update node to layout size
// WARN: We suppose label are always on top of children (that wrong)
const childrenContentBox = computeNodesBox(visibleNodes, directNodesChildren); // WARN: The current content box algorithm does not take the margin of direct children (it should)
const directChildrenAwareNodeWidth = childrenContentBox.x + childrenContentBox.width + rectangularNodePadding;
const northBorderNodeFootprintWidth = getNorthBorderNodeFootprintWidth(visibleNodes, borderNodes, previousDiagram);
const southBorderNodeFootprintWidth = getSouthBorderNodeFootprintWidth(visibleNodes, borderNodes, previousDiagram);
const labelOnlyWidth =
rectangularNodePadding + (labelElement?.getBoundingClientRect().width ?? 0) + rectangularNodePadding;
const nodeWidth =
Math.max(
directChildrenAwareNodeWidth,
labelOnlyWidth,
northBorderNodeFootprintWidth,
southBorderNodeFootprintWidth
) +
borderWidth * 2;
// WARN: the label is not used for the height because children are already position under the label
const directChildrenAwareNodeHeight = childrenContentBox.y + childrenContentBox.height + rectangularNodePadding;
const eastBorderNodeFootprintHeight = getEastBorderNodeFootprintHeight(visibleNodes, borderNodes, previousDiagram);
const westBorderNodeFootprintHeight = getWestBorderNodeFootprintHeight(visibleNodes, borderNodes, previousDiagram);
const nodeHeight =
Math.max(directChildrenAwareNodeHeight, eastBorderNodeFootprintHeight, westBorderNodeFootprintHeight) +
borderWidth * 2;
node.width = forceWidth ?? getNodeOrMinWidth(nodeWidth);
node.height = getNodeOrMinHeight(nodeHeight);
// Update border nodes positions
borderNodes.forEach((borderNode) => {
borderNode.extent = getBorderNodeExtent(node, borderNode);
});
setBorderNodesPosition(borderNodes, node, previousDiagram);
}
private handleLeafNode(
_previousDiagram: Diagram | null,
node: Node<RectangularNodeData, 'rectangularNode'>,
visibleNodes: Node<NodeData, DiagramNodeType>[],
borderWidth: number,
forceWidth?: number
) {
const nodeIndex = 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 ?? getNodeOrMinWidth(labelWidth);
node.height = getNodeOrMinHeight(labelHeight);
}
}