syncfusion-maui-treeview

Implementing Syncfusion® .NET MAUI TreeView

The Syncfusion .NET MAUI TreeView (SfTreeView) is a powerful data-oriented control for displaying hierarchical data structures such as organizational charts, file systems, nested connections, and multi-level data. It provides intuitive expand/collapse functionality, multiple selection modes, drag-and-drop support, and extensive customization options.

When to Use This Skill

Use this skill when implementing:

• Hierarchical Data Display: Organizational structures, file explorers, category trees, nested menus
• Interactive Tree Navigation: Expandable/collapsible nodes, multi-level browsing
• Data Binding Scenarios: Bound mode with ItemsSource or unbound mode with manual nodes
• Selection Requirements: Single, multiple, or extended selection in tree structures
• Custom Tree UI: Templated nodes, custom expanders, styled tree items
• Advanced Tree Features: Drag-drop reordering, filtering, sorting, load on demand
• MVVM Applications: TreeView with commands, data binding, and ViewModel patterns

Component Overview

Key Capabilities:

• Enhanced performance with optimized view-reusing strategy
• Bound and unbound data modes
• Multiple selection modes with keyboard navigation
• Item and expander templating
• Expand/collapse with animations
• Drag-and-drop node reordering
• Filtering and sorting support
• Load on demand for large datasets
• MVVM pattern support
• RTL (right-to-left) support
• Customizable appearance and styling

Documentation and Navigation Guide

Getting Started

📄 Read: references/getting-started.md

When to read: Setting up TreeView for the first time, initial configuration, basic implementation

Covers:

• Installing Syncfusion.Maui.TreeView NuGet package
• Registering Syncfusion handler in MauiProgram.cs
• Creating a basic TreeView control
• First working example

Data Binding and Population

📄 Read: references/data-binding.md

When to read: Populating TreeView with data, choosing between bound/unbound modes, hierarchical data structures

Covers:

• Bound vs unbound modes comparison
• Creating nodes without data source (unbound mode with TreeViewNode)
• Data binding with ItemsSource (bound mode)
• Using HierarchyPropertyDescriptors for complex hierarchies
• ChildPropertyName configuration

Selection

📄 Read: references/selection.md

When to read: Implementing node selection, handling selection events, customizing selection appearance

Covers:

• Selection modes: Single, SingleDeselect, Multiple, Extended, None
• SelectedItem, CurrentItem, and SelectedItems properties
• SelectionChanging and SelectionChanged events
• SelectionBackground and SelectionForeground customization
• Keyboard navigation (WinUI, MacCatalyst)

Node Expansion and Collapse

📄 Read: references/expand-collapse.md

When to read: Configuring expand/collapse behavior, handling expansion events, initial node states

Covers:

• AutoExpandMode options (None, AllNodes, RootNodes, specific levels)
• ExpandActionTarget (Expander, Node)
• NodeExpanding and NodeCollapsing events
• IsExpanded property for individual nodes
• Expand/collapse animations

Data Operation

📄 Read: references/filtering.md

When to read: Filtering tree nodes, implementing search functionality, showing/hiding nodes based on criteria, Sorting tree nodes, custom sort logic, multi-level sorting

Covers:

• FilterMode (None, Contains, StartsWith, Equals, Custom)
• Filtering API (FilterText, FilterPath, FilterPaths, AutoExpandOnFilter, FilteredItems)
• SortComparer configuration
• Sorting hierarchical data at each level

Styling and Appearance

📄 Read: references/styling-appearance.md

When to read: Customizing visual appearance, adjusting spacing and indentation, applying themes, Customizing node appearance, creating custom expanders, designing tree item UI

Covers:

• Item height customization (ItemHeight property)
• Indentation settings for nested levels
• Liquid glass effect styling
• Background and foreground colors
• Border and padding customization
• Theme integration
• ItemTemplate, ExpanderTemplate customization and Template selectors for conditional templates
• ItemTemplateContextType (Node vs Data binding context)

Checkbox

📄 Read: references/styling-appearance.md

When to read: Adding checkbox functionality to tree nodes, tracking checked items, customizing checkbox behavior and appearance

Covers:

• Checkbox enablement and state management
• CheckBoxMode configuration:
  • None
  • Individual
  • Recursive
• TreeViewNode.IsChecked property
• CheckedItems collection binding
• GetCheckedNodes API
• CheckBoxPosition and CheckBoxWidth customization
• CheckActionTarget configuration
• Parent-child recursive checkbox synchronization
• Bound mode and unbound mode checkbox handling
• Custom checkbox templates with SfCheckBox
• Programmatic checkbox

MVVM Support

📄 Read: references/mvvm-support.md

When to read: Implementing TreeView with MVVM pattern, using commands and data binding

Covers:

• ViewModel setup for TreeView
• INotifyPropertyChanged implementation
• Command binding for node actions
• Data-bound ItemsSource
• Selection binding in MVVM
• Event-to-command patterns

Scrolling and Navigation

📄 Read: references/scrolling-navigation.md

When to read: Programmatic scrolling, bringing items into view, keyboard navigation

Covers:

• BringIntoView method with all overloads
• Scroll position options (Start, Center, End, MakeVisible)
• Scroll animation control
• Horizontal scrolling configuration
• Scrollbar visibility control
• Keyboard navigation (arrow keys, Tab)
• Events (Loaded, ItemTapped, ItemDoubleTapped, ItemRightTapped)

Item Height Customization

📄 Read: references/item-height-customization.md

When to read: Customizing node heights, dynamic sizing, content-based measurements

Covers:

• Static ItemHeight property
• QueryNodeSize event for per-item heights
• NodeSizeMode property (Dynamic vs None)
• GetActualNodeHeight method
• Dynamic height calculation

Advanced Features

📄 Read: references/advanced-features.md

When to read: Implementing advanced TreeView operations, events, Right-to-left, Enabling node reordering, implementing drag-drop functionality, customizing drag behavior, mplementing lazy loading of child nodes, handling large datasets, API-based hierarchies, Adding checkboxes to nodes, handling checked/unchecked states, recursive checkbox modes, Displaying empty states, customizing no-data UI, template-based empty views

Covers:

• Working with TreeViewNode programmatically
• Right-to-Left (RTL)
• Events
• Drag and Drop
• Load on Demand
• Checkbox, CheckBoxMode (Recursive, Cascade, None), Working with checked items collection
• Display view when empty item state
• EmptyViewTemplate for templated empty views

Troubleshooting

📄 Read: references/troubleshooting.md

When to read: Debugging issues, resolving errors, optimization problems

Covers:

• Common TreeView issues and solutions
• Performance troubleshooting
• Data binding problems
• Selection not working
• Template rendering issues