flex_org_chart

Highly customizable, animated org chart widget for Flutter: pan/zoom, a flextree-based compact layout for leaf-heavy teams, expand/collapse, highlighting, and independent connection overlays. Ported from d3-org-chart.

(Screenshot from example/ — see Example below.)

Install

dependencies:
  flex_org_chart: ^0.4.1

Quickstart

OrgChartController is caller-owned — create and keep it (e.g. as a State field) wherever you own the chart's data, and call dispose() on it yourself when you're done, as the example app does; the OrgChart widget below only observes and drives it.

import 'package:flutter/material.dart';
import 'package:flex_org_chart/flex_org_chart.dart';

class Employee {
  const Employee(this.id, this.managerId, this.name);
  final String id;
  final String? managerId;
  final String name;
}

final controller = OrgChartController<Employee>(
  data: const [
    Employee('1', null, 'Ada Lovelace'),
    Employee('2', '1', 'Grace Hopper'),
    Employee('3', '1', 'Katherine Johnson'),
  ],
  idOf: (e) => e.id,
  parentIdOf: (e) => e.managerId,
);

// Anywhere in your widget tree:
OrgChart<Employee>(
  controller: controller,
  nodeBuilder: (context, node) => Card(
    child: Center(child: Text(node.data.name)),
  ),
  onNodeTap: (node) => controller.highlightPathToRoot(node.id),
);

// Imperative navigation, from anywhere that holds the controller:
controller.fit();
controller.centerNode('2');
controller.expandAll();

Drag-and-drop re-parenting is opt-in — provide onReparent, apply the change to your data, and call setData (which preserves expansion state by default, so the moved subtree animates to its new parent):

OrgChart<Employee>(
  controller: controller,
  nodeBuilder: ...,
  onReparent: (node, newParent) {
    myData = reassignManager(myData, node.id, newParent.id);
    controller.setData(myData);
  },
  // Optional: veto targets beyond the built-in cycle rule.
  canReparent: (node, candidate) => candidate.data.role != 'contractor',
);

Long-press (~500ms) lifts a node; a quick drag still pans the canvas. Dropping on the node's own subtree, on empty space, or on a vetoed target snaps back and calls nothing.

Programmatic editing goes through the controller — every op animates and fires onDataChanged for persistence:

final controller = OrgChartController<Employee>(
  data: employees,
  idOf: (e) => e.id,
  parentIdOf: (e) => e.managerId,
  withParent: (e, id) => Employee(e.id, id, e.name), // enables reparent/promotion
  onDataChanged: (data) => api.save(data),
);

controller.addNode(newHire);          // parent must exist
controller.reparent('7', '2');        // cycle-safe; drag-drop can delegate here
controller.removeNode('4');           // children promote to the grandparent
controller.updateNode(renamedPerson); // same id, new payload

Department bounding boxes draw a labeled box behind any subtree — declare groups on the controller, style them on the widget (or per group):

OrgChartController<Employee>(
  data: employees,
  idOf: (e) => e.id,
  parentIdOf: (e) => e.managerId,
  groups: [
    ChartGroup(rootId: '3', label: 'Engineering'),
    ChartGroup(rootId: '7', label: 'Design',
        style: GroupBoxStyle(dash: [8, 6])),
  ],
);

Boxes wrap the root and its currently visible descendants, shrink and grow as you collapse/expand within the department, and animate with every layout change. d3-org-chart has no equivalent.

Features

Feature	flex_org_chart	d3-org-chart
Tree layout (top/bottom/left/right)	done	done
Compact mode (leaf-heavy folding)	done	done
Pan / pinch-zoom / scroll-zoom	done	done
Expand / collapse (single, all, programmatic)	done	done
Fit / center-on-node / zoom in/out	done	done
Highlight + highlight-path-to-root	done	done
Custom node rendering	done (nodeBuilder, any widget)	done (HTML template)
Custom expand/collapse affordance	done (expandButtonBuilder)	done
Animated layout transitions	done	done
Non-hierarchical connections (dashed, labeled)	done	done
Data validation (cycles, missing parents, dup ids)	done (OrgChartDataException)	partial (throws generic errors)
Drag-and-drop re-parenting	done (long-press to lift)	done
Node editing (add/remove/re-parent via API)	done	done
Department bounding boxes (group nodes by subtree)	done	—
Image / PDF export	roadmap	done

Rows marked roadmap are not implemented in this release — there is no partial or hidden support for them — and are listed in planned build order. If your use case depends on one of them, this package isn't ready for it yet. d3-org-chart's pagination for very large trees is not planned.

Example

example/ is a complete demo, not a toy: a 25-person, 4-level org (with one manager whose 6 direct reports show off compact-mode folding), wired to every feature above — layout-direction switching, the compact toggle, fit/expand-all/collapse-all/center/highlight-path actions, tap-to-highlight, and two connection overlays. Run it with:

cd example
flutter run -d macos   # or -d chrome, or a connected device

Third-party licenses

This package ports the layout algorithms and API design of d3-org-chart (MIT) and d3-flextree (WTFPL). See THIRD_PARTY_LICENSES.md for full attribution.

License

BSD 3-Clause.