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ImageNodeLayoutHandler.ts
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ImageNodeLayoutHandler.ts
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/*******************************************************************************
* Copyright (c) 2023, 2024 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 { NodeData } from '../DiagramRenderer.types';
import { ImageNodeData } from '../node/ImageNode.types';
import { DiagramNodeType } from '../node/NodeTypes.types';
import { ILayoutEngine, INodeLayoutHandler } from './LayoutEngine.types';
import { computePreviousSize } from './bounds';
import { RawDiagram } from './layout.types';
import { getBorderNodeExtent } from './layoutBorderNodes';
import {
applyRatioOnNewNodeSizeValue,
computeNodesBox,
getEastBorderNodeFootprintHeight,
getNodeOrMinHeight,
getNodeOrMinWidth,
getNorthBorderNodeFootprintWidth,
getSouthBorderNodeFootprintWidth,
getWestBorderNodeFootprintHeight,
setBorderNodesPosition,
} from './layoutNode';
import { borderLeftAndRight, borderTopAndBottom, rectangularNodePadding } from './layoutParams';
export class ImageNodeLayoutHandler implements INodeLayoutHandler<ImageNodeData> {
public canHandle(node: Node<NodeData, DiagramNodeType>) {
return node.type === 'imageNode';
}
public handle(
layoutEngine: ILayoutEngine,
previousDiagram: RawDiagram | null,
node: Node<ImageNodeData, 'imageNode'>,
visibleNodes: Node<NodeData, DiagramNodeType>[],
directChildren: Node<NodeData, DiagramNodeType>[],
newlyAddedNode: Node<NodeData, DiagramNodeType> | undefined,
forceWidth?: number
) {
if (directChildren.length > 0) {
this.handleParentNode(layoutEngine, previousDiagram, node, visibleNodes, directChildren, newlyAddedNode);
} else {
this.handleLeafNode(previousDiagram, node, forceWidth);
}
}
private handleParentNode(
layoutEngine: ILayoutEngine,
previousDiagram: RawDiagram | null,
node: Node<ImageNodeData, 'imageNode'>,
visibleNodes: Node<NodeData, DiagramNodeType>[],
directChildren: Node<NodeData, DiagramNodeType>[],
newlyAddedNode: Node<NodeData, DiagramNodeType> | undefined
) {
layoutEngine.layoutNodes(previousDiagram, visibleNodes, directChildren, newlyAddedNode);
const previousNode = (previousDiagram?.nodes ?? []).find((previousNode) => previousNode.id === node.id);
const previousDimensions = computePreviousSize(previousNode, node);
if (previousDimensions) {
node.width = getNodeOrMinWidth(previousDimensions.width, node);
node.height = getNodeOrMinHeight(previousDimensions.height, node);
} else {
node.width = getNodeOrMinWidth(undefined, node);
node.height = getNodeOrMinHeight(undefined, node);
}
const borderNodes = directChildren.filter((node) => node.data.isBorderNode);
const directNodesChildren = directChildren.filter((child) => !child.data.isBorderNode);
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 nodeWidth = Math.max(
directChildrenAwareNodeWidth,
node.width,
northBorderNodeFootprintWidth,
southBorderNodeFootprintWidth
);
// 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,
node.height,
eastBorderNodeFootprintHeight,
westBorderNodeFootprintHeight
);
node.width = getNodeOrMinWidth(nodeWidth + borderLeftAndRight, node);
node.height = getNodeOrMinHeight(nodeHeight + borderTopAndBottom, node);
if (node.data.nodeDescription?.keepAspectRatio) {
applyRatioOnNewNodeSizeValue(node);
}
// Update border nodes positions
borderNodes.forEach((borderNode) => {
borderNode.extent = getBorderNodeExtent(node, borderNode);
});
setBorderNodesPosition(borderNodes, node, previousDiagram);
}
private handleLeafNode(
previousDiagram: RawDiagram | null,
node: Node<ImageNodeData, 'imageNode'>,
forceWidth?: number
) {
const minNodeWith = forceWidth ?? getNodeOrMinWidth(undefined, node);
const minNodeHeight = getNodeOrMinHeight(undefined, node);
const previousNode = (previousDiagram?.nodes ?? []).find((previous) => previous.id === node.id);
const previousDimensions = computePreviousSize(previousNode, node);
if (node.data.resizedByUser) {
if (minNodeWith > previousDimensions.width) {
node.width = minNodeWith;
} else {
node.width = previousDimensions.width;
}
if (minNodeHeight > previousDimensions.height) {
node.height = minNodeHeight;
} else {
node.height = previousDimensions.height;
}
} else {
node.width = minNodeWith;
node.height = minNodeHeight;
}
if (node.data.nodeDescription?.keepAspectRatio) {
applyRatioOnNewNodeSizeValue(node);
}
}
}