Dismissible class

A widget that can be dismissed by dragging in the indicated direction.

Dragging or flinging this widget in the DismissDirection causes the child to slide out of view. Following the slide animation, if resizeDuration is non-null, the Dismissible widget animates its height (or width, whichever is perpendicular to the dismiss direction) to zero over the resizeDuration.

Backgrounds can be used to implement the "leave-behind" idiom. If a background is specified it is stacked behind the Dismissible's child and is exposed when the child moves.

The widget calls the onDismissed callback either after its size has collapsed to zero (if resizeDuration is non-null) or immediately after the slide animation (if resizeDuration is null). If the Dismissible is a list item, it must have a key that distinguishes it from the other items and its onDismissed callback must remove the item from the list.



Dismissible({@required Key key, @required Widget child, Widget background, Widget secondaryBackground, ConfirmDismissCallback confirmDismiss, VoidCallback onResize, DismissDirectionCallback onDismissed, DismissDirection direction: DismissDirection.horizontal, Duration resizeDuration: const Duration(milliseconds: 300), Map<DismissDirection, double> dismissThresholds: const {}, Duration movementDuration: const Duration(milliseconds: 200), double crossAxisEndOffset: 0.0, DragStartBehavior dragStartBehavior: DragStartBehavior.start})
Creates a widget that can be dismissed. [...]


background Widget
A widget that is stacked behind the child. If secondaryBackground is also specified then this widget only appears when the child has been dragged down or to the right.
child Widget
The widget below this widget in the tree. [...]
confirmDismiss ConfirmDismissCallback
Gives the app an opportunity to confirm or veto a pending dismissal. [...]
crossAxisEndOffset double
Defines the end offset across the main axis after the card is dismissed. [...]
direction DismissDirection
The direction in which the widget can be dismissed.
dismissThresholds Map<DismissDirection, double>
The offset threshold the item has to be dragged in order to be considered dismissed. [...]
dragStartBehavior DragStartBehavior
Determines the way that drag start behavior is handled. [...]
movementDuration Duration
Defines the duration for card to dismiss or to come back to original position if not dismissed.
onDismissed DismissDirectionCallback
Called when the widget has been dismissed, after finishing resizing.
onResize VoidCallback
Called when the widget changes size (i.e., when contracting before being dismissed).
resizeDuration Duration
The amount of time the widget will spend contracting before onDismissed is called. [...]
secondaryBackground Widget
A widget that is stacked behind the child and is exposed when the child has been dragged up or to the left. It may only be specified when background has also been specified.
hashCode int
The hash code for this object. [...]
@nonVirtual, 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


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


operator ==(Object other) bool
The equality operator. [...]
@nonVirtual, inherited