u/VenniCidi

I'm working on Flowy.Blazor v2

v1 shipped as a hierarchical tree visualizer (drag & drop, auto-layout, zoom/pan, JSON import/export, custom node templates). v2 turns it into a proper visual editor — way bigger scope than I expected.

New in v2 (not in v1):

Canvas & navigation

• Free canvas mode alongside tree mode (multi-root, manual positioning)
• Programmatic viewport — FitViewAsync, SetViewportAsync (animated), GetViewportAsync
• Fit to subset — fit the view to a specific set of item IDs
• Pan boundaries (translateExtent) and min/max zoom clamps
• Auto-pan when dragging near canvas edges (configurable speed + threshold)
• Coordinate helpers — ScreenToFlowPositionAsync / FlowToScreenPositionAsync

Selection & editing

• Marquee selection — shift-drag to box-select
• Ctrl-click multi-select
• Programmatic selection API — SelectItemAsync, SelectItemsAsync, ClearSelectionAsync, RemoveSelectedAsync
• Undo / Redo with configurable history depth
• Bulk mutations — DeleteItemsAsync, read-only queries (AllItems, Roots, GetChildren, etc.)
• Promote / demote items in the tree, with OnTreeRestructured event
• Manual layout — drop items at custom positions, OnItemRepositioned event
• Snap to grid (configurable X/Y)

Edges

• Edge markers — arrow heads on start/end with multiple variants
• Edge styling — stroke width, dash patterns, animated dashes
• Edge labels with animation support

Drag & drop

• Configurable drag threshold
• Drop position bands (left/right/under)
• Drop validation — reject by depth, position, custom rules, with ValidationMessage
• Cross-canvas dragging via a drag registry — move items between separate canvases
• NoDrag class to opt subtrees out of dragging

Events

• Pane events: OnPaneClick, OnPaneContextMenu, OnItemContextMenu
• Hover events: OnItemMouseEnter / Leave / Move
• Drag event log, drop events, tree restructure, error events

Other

• Configurable keyboard bindings — every key (delete, undo, redo, pan/zoom activation, selection modifiers) is overridable; full disable supported
• SVG export with options
• Light/dark theming with token overrides
• Background variants (slot + overlay) you can switch live
• Minimap
• Customizable toolbox palette

Small UX wins too: toolbar hides while dragging, smoother layout animations (JS-driven transforms), order map preserved across JSON round-trips.