TListControllerExpansion<T, K> extension

Extension providing expansion functionality for hierarchical lists.

Enables single and multiple item expansion with methods to:

  • Expand/collapse individual items
  • Expand/collapse all items
  • Toggle expansion states
  • Query expansion status

Example:

// Expand an item
controller.expandItem(category);

// Expand multiple items
controller.expandItems([category1, category2]);

// Check expansion
if (controller.hasExpansion) {
  print('Expanded: ${controller.expandedCount}');
}

// Collapse all
controller.collapseAll();
on

Properties

expandable → bool

Available on TListController<T, K>, provided by the TListControllerExpansion extension

Whether expansion is enabled.
no setter
expandedCount → int

Available on TListController<T, K>, provided by the TListControllerExpansion extension

The number of expanded items.
no setter
expandedItems → List<T>

Available on TListController<T, K>, provided by the TListControllerExpansion extension

The list of expanded items.
no setter
expandedKeys → LinkedHashSet<K>

Available on TListController<T, K>, provided by the TListControllerExpansion extension

The set of expanded item keys.
no setter
expansionInfo → String

Available on TListController<T, K>, provided by the TListControllerExpansion extension

Human-readable expansion information.
no setter
hasExpansion → bool

Available on TListController<T, K>, provided by the TListControllerExpansion extension

Whether any items are expanded.
no setter
hasMultipleExpansion → bool

Available on TListController<T, K>, provided by the TListControllerExpansion extension

Whether multiple items are expanded.
no setter
isAllExpanded → bool

Available on TListController<T, K>, provided by the TListControllerExpansion extension

Whether all items are expanded.
no setter
isSomeExpanded → bool

Available on TListController<T, K>, provided by the TListControllerExpansion extension

Whether some (but not all) items are expanded.
no setter

Methods

collapseAll() → void

Available on TListController<T, K>, provided by the TListControllerExpansion extension

collapseItem(T item) → void

Available on TListController<T, K>, provided by the TListControllerExpansion extension

collapseItemKey(K key) → void

Available on TListController<T, K>, provided by the TListControllerExpansion extension

expandAll() → void

Available on TListController<T, K>, provided by the TListControllerExpansion extension

expandItem(T item) → void

Available on TListController<T, K>, provided by the TListControllerExpansion extension

expandItemKey(K key) → void

Available on TListController<T, K>, provided by the TListControllerExpansion extension

expandItemKeys(Iterable<K> keys) → void

Available on TListController<T, K>, provided by the TListControllerExpansion extension

expandItems(Iterable<T> items) → void

Available on TListController<T, K>, provided by the TListControllerExpansion extension

isItemExpanded(T item) → void

Available on TListController<T, K>, provided by the TListControllerExpansion extension

isItemKeyExpanded(K key) → bool

Available on TListController<T, K>, provided by the TListControllerExpansion extension

toggleExpandAll() → void

Available on TListController<T, K>, provided by the TListControllerExpansion extension

toggleExpansion(T item) → void

Available on TListController<T, K>, provided by the TListControllerExpansion extension

toggleExpansionByKey(K key) → void

Available on TListController<T, K>, provided by the TListControllerExpansion extension

updateExpansionState(LinkedHashSet<K> expandedKeys) → void

Available on TListController<T, K>, provided by the TListControllerExpansion extension