A widget that merges the semantics of its descendants.

Causes all the semantics of the subtree rooted at this node to be merged into one node in the semantics tree. For example, if you have a widget with a Text node next to a checkbox widget, this could be used to merge the label from the Text node with the "checked" semantic state of the checkbox into a single node that had both the label and the checked state. Otherwise, the label would be presented as a separate feature than the checkbox, and the user would not be able to be sure that they were related.

Be aware that if two nodes in the subtree have conflicting semantics, the result may be nonsensical. For example, a subtree with a checked checkbox and an unchecked checkbox will be presented as checked. All the labels will be merged into a single string (with newlines separating each label from the other). If multiple nodes in the merged subtree can handle semantic gestures, the first one in tree order will be the one to receive the callbacks.

Inheritance

Constructors

MergeSemantics({Key key, Widget child })

Creates a widget that merges the semantics of its descendants.

Properties

child → Widget

The widget below this widget in the tree.

read-only, inherited
hashCode → int

Get a hash code for this object.

read-only, inherited
key → Key

Controls how one widget replaces another widget in the tree.

read-only, inherited
runtimeType → Type

A representation of the runtime type of the object.

read-only, inherited

Operators

operator ==(other) → bool

The equality operator.

inherited

Methods

createRenderObject(BuildContext context) → RenderMergeSemantics

Creates an instance of the RenderObject class that this RenderObjectWidget represents, using the configuration described by this RenderObjectWidget.

createElement() → SingleChildRenderObjectElement

RenderObjectWidgets always inflate to a RenderObjectElement subclass.

inherited
debugFillDescription(List<String> description) → void

Add additional information to the given description for use by toString.

inherited
didUnmountRenderObject(RenderObject renderObject) → void

A render object previously associated with this widget has been removed from the tree. The given RenderObject will be of the same type as returned by this object's createRenderObject.

inherited
noSuchMethod(Invocation invocation) → dynamic

Invoked when a non-existent method or property is accessed.

inherited
toString() → String

Returns a string representation of this object.

inherited
toStringShort() → String

A short, textual description of this widget.

inherited
updateRenderObject(BuildContext context, RenderObject renderObject) → void

Copies the configuration described by this RenderObjectWidget to the given RenderObject, which will be of the same type as returned by this object's createRenderObject.

inherited