A widget that detects gestures described by the given gesture factories.

For common gestures, use a GestureRecognizer. RawGestureDetector is useful primarily when developing your own gesture recognizers.

Configuring the gesture recognizers requires a carefully constructed map, as described in gestures and as shown in the example below.

Sample code

This example shows how to hook up a TapGestureRecognizer. It assumes that the code is being used inside a State object with a _last field that is then displayed as the child of the gesture detector.

new RawGestureDetector(
  gestures: <Type, GestureRecognizerFactory>{
    TapGestureRecognizer: new GestureRecognizerFactoryWithHandlers<TapGestureRecognizer>(
      () => new TapGestureRecognizer(),
      (TapGestureRecognizer instance) {
        instance
          ..onTapDown = (TapDownDetails details) { setState(() { _last = 'down'; }); }
          ..onTapUp = (TapUpDetails details) { setState(() { _last = 'up'; }); }
          ..onTap = () { setState(() { _last = 'tap'; }); }
          ..onTapCancel = () { setState(() { _last = 'cancel'; }); };
      },
    ),
  },
  child: new Container(width: 300.0, height: 300.0, color: Colors.yellow, child: new Text(_last)),
)

See also:

  • GestureDetector, a less flexible but much simpler widget that does the same thing.
  • Listener, a widget that reports raw pointer events.
  • GestureRecognizer, the class that you extend to create a custom gesture recognizer.
Inheritance

Constructors

RawGestureDetector({Key key, Widget child, Map<Type, GestureRecognizerFactory> gestures: const {}, HitTestBehavior behavior, bool excludeFromSemantics: false })
Creates a widget that detects gestures. [...]
const

Properties

behavior HitTestBehavior
How this gesture detector should behave during hit testing.
final
child Widget
The widget below this widget in the tree.
final
excludeFromSemantics bool
Whether to exclude these gestures from the semantics tree. For example, the long-press gesture for showing a tooltip is excluded because the tooltip itself is included in the semantics tree directly and so having a gesture to show it would result in duplication of information.
final
gestures Map<Type, GestureRecognizerFactory>
The gestures that this widget will attempt to recognize. [...]
final
hashCode int
The hash code for this object. [...]
read-only, inherited
key Key
Controls how one widget replaces another widget in the tree. [...]
final, inherited
runtimeType Type
A representation of the runtime type of the object.
read-only, inherited

Methods

createState() RawGestureDetectorState
Creates the mutable state for this widget at a given location in the tree. [...]
createElement() StatefulElement
Creates a StatefulElement to manage this widget's location in the tree. [...]
inherited
debugDescribeChildren() List<DiagnosticsNode>
Returns a list of DiagnosticsNode objects describing this node's children. [...]
@protected, inherited
debugFillProperties(DiagnosticPropertiesBuilder description) → void
Add additional properties associated with the node. [...]
inherited
noSuchMethod(Invocation invocation) → dynamic
Invoked when a non-existent method or property is accessed. [...]
inherited
toDiagnosticsNode({String name, DiagnosticsTreeStyle style }) DiagnosticsNode
Returns a debug representation of the object that is used by debugging tools and by toStringDeep. [...]
inherited
toString({DiagnosticLevel minLevel: DiagnosticLevel.debug }) String
Returns a string representation of this object.
inherited
toStringDeep({String prefixLineOne: '', String prefixOtherLines, DiagnosticLevel minLevel: DiagnosticLevel.debug }) String
Returns a string representation of this node and its descendants. [...]
inherited
toStringShallow({String joiner: ', ', DiagnosticLevel minLevel: DiagnosticLevel.debug }) String
Returns a one-line detailed description of the object. [...]
inherited
toStringShort() String
A short, textual description of this widget.
inherited

Operators

operator ==(other) bool
The equality operator. [...]
inherited