/// Update the information associated with the node with the given `id`.
///
/// The semantics nodes form a tree, with the root of the tree always having
/// an id of zero. The `childrenInTraversalOrder` and `childrenInHitTestOrder`
/// are the ids of the nodes that are immediate children of this node. The
/// former enumerates children in traversal order, and the latter enumerates
/// the same children in the hit test order. The two lists must have the same
/// length and contain the same ids. They may only differ in the order the
/// ids are listed in. For more information about different child orders, see
/// [DebugSemanticsDumpOrder].
///
/// The system retains the nodes that are currently reachable from the root.
/// A given update need not contain information for nodes that do not change
/// in the update. If a node is not reachable from the root after an update,
/// the node will be discarded from the tree.
///
/// The `flags` are a bit field of [SemanticsFlag]s that apply to this node.
///
/// The `actions` are a bit field of [SemanticsAction]s that can be undertaken
/// by this node. If the user wishes to undertake one of these actions on this
/// node, the [Window.onSemanticsAction] will be called with `id` and one of
/// the possible [SemanticsAction]s. Because the semantics tree is maintained
/// asynchronously, the [Window.onSemanticsAction] callback might be called
/// with an action that is no longer possible.
///
/// The `label` is a string that describes this node. The `value` property
/// describes the current value of the node as a string. The `increasedValue`
/// string will become the `value` string after a [SemanticsAction.increase]
/// action is performed. The `decreasedValue` string will become the `value`
/// string after a [SemanticsAction.decrease] action is performed. The `hint`
/// string describes what result an action performed on this node has. The
/// reading direction of all these strings is given by `textDirection`.
///
/// The fields 'textSelectionBase' and 'textSelectionExtent' describe the
/// currently selected text within `value`.
///
/// For scrollable nodes `scrollPosition` describes the current scroll
/// position in logical pixel. `scrollExtentMax` and `scrollExtentMin`
/// describe the maximum and minimum in-rage values that `scrollPosition` can
/// be. Both or either may be infinity to indicate unbound scrolling. The
/// value for `scrollPosition` can (temporarily) be outside this range, for
/// example during an overscroll. `scrollChildren` is the count of the
/// total number of child nodes that contribute semantics and `scrollIndex`
/// is the index of the first visible child node that contributes semantics.
///
/// The `rect` is the region occupied by this node in its own coordinate
/// system.
///
/// The `transform` is a matrix that maps this node's coordinate system into
/// its parent's coordinate system.
public void updateNode(
int id = 0,
SemanticsFlag flags = 0,
SemanticsAction actions = 0,
int textSelectionBase = 0,
int textSelectionExtent = 0,
int scrollChildren = 0,
int scrollIndex = 0,
double scrollPosition = 0.0,
double scrollExtentMax = 0.0,
double scrollExtentMin = 0.0,
Rect rect = null,
String label = null,
String hint = null,
String value = null,
String increasedValue = null,
String decreasedValue = null,
TextDirection textDirection = TextDirection.ltr,
SKMatrix44 transform = null,
List <int> childrenInTraversalOrder = null,
List <int> childrenInHitTestOrder = null,
List <int> additionalActions = null)
{
SemanticsNode node = new SemanticsNode
{
id = id,
flags = flags,
actions = actions,
textSelectionBase = textSelectionBase,
textSelectionExtent = textSelectionExtent,
scrollChildren = scrollChildren,
scrollIndex = scrollIndex,
scrollPosition = scrollPosition,
scrollExtentMax = scrollExtentMax,
scrollExtentMin = scrollExtentMin,
rect = rect.ToSKRect(),
label = label,
hint = hint,
value = value,
increasedValue = increasedValue,
decreasedValue = decreasedValue,
textDirection = textDirection,
transform = transform,
childrenInTraversalOrder = childrenInTraversalOrder,
childrenInHitTestOrder = childrenInHitTestOrder,
customAccessibilityActions = additionalActions
};
nodes_[id] = node;
}
public bool HasAction(SemanticsAction action) => actions.HasFlag(action);