CallbackShortcuts class Null safety
A widget that provides an uncomplicated mechanism for binding a key combination to a specific callback.
This is similar to the functionality provided by the Shortcuts widget, but instead of requiring a mapping to an Intent, and an Actions widget somewhere in the widget tree to bind the Intent to, it just takes a set of bindings that bind the key combination directly to a VoidCallback.
Because it is a simpler mechanism, it doesn't provide the ability to disable the callbacks, or to separate the definition of the shortcuts from the definition of the code that is triggered by them (the role that actions play in the Shortcuts/Actions system).
However, for some applications the complexity and flexibility of the Shortcuts and Actions mechanism is overkill, and this widget is here for those apps.
Shortcuts and CallbackShortcuts can both be used in the same app. As with any key handling widget, if this widget handles a key event then widgets above it in the focus chain will not receive the event. This means that if this widget handles a key, then an ancestor Shortcuts widget (or any other key handling widget) will not receive that key, and similarly, if a descendant of this widget handles the key, then the key event will not reach this widget for handling.
See also:
- Focus, a widget that defines which widgets can receive keyboard focus.
- Inheritance
-
- Object
- DiagnosticableTree
- Widget
- StatelessWidget
- CallbackShortcuts
Constructors
-
CallbackShortcuts({Key? key, required Map<
ShortcutActivator, VoidCallback> bindings, required Widget child}) -
Creates a const CallbackShortcuts widget.
const
Properties
-
bindings
→ Map<
ShortcutActivator, VoidCallback> -
A map of key combinations to callbacks used to define the shortcut
bindings.
final
- child → Widget
-
The widget below this widget in the tree.
final
- hashCode → int
- The hash code for this object.
- key → Key?
-
Controls how one widget replaces another widget in the tree.
finalinherited
- runtimeType → Type
-
A representation of the runtime type of the object.
read-onlyinherited
Methods
-
build(
BuildContext context) → Widget -
Describes the part of the user interface represented by this widget.
override
-
createElement(
) → StatelessElement -
Creates a StatelessElement 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">@protectedinherited -
debugFillProperties(
DiagnosticPropertiesBuilder properties) → 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 DiagnosticsNode.toStringDeep.
inherited
-
toString(
{DiagnosticLevel minLevel = DiagnosticLevel.info}) → String -
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 ==(
Object other) → bool -
The equality operator.
nonVirtual">@nonVirtualinherited