MultiSelectableSelectionContainerDelegate class Null safety

An abstract base class for updating multiple selectable children.

This class provide basic SelectionEvent handling and child Selectable updating. The subclass needs to implement ensureChildUpdated to ensure child Selectable is updated properly.

This class optimize the selection update by keeping track of the Selectables that currently contain the selection edges.

Mixed in types




compareOrder Comparator<Selectable>
The compare function this delegate used for determining the selection order of the selectables.
@protected, read-only
containerSize Size
Gets the size of the SelectionContainer of this delegate.
read-only, inherited
currentSelectionEndIndex int
The current selectable that contains the selection end edge.
@protected, read / write
currentSelectionStartIndex int
The current selectable that contains the selection start edge.
@protected, read / write
hashCode int
The hash code for this object.
read-only, inherited
hasListeners bool
Whether any listeners are currently registered.
@protected, read-only, inherited
runtimeType Type
A representation of the runtime type of the object.
read-only, inherited
selectables List<Selectable>
Gets the list of selectables this delegate is managing.
read / write
value SelectionGeometry
The current value of the object. When the value changes, the callbacks registered with addListener will be invoked.
read-only, override


add(Selectable selectable) → void
Adds the selectable into the registrar.
addListener(VoidCallback listener) → void
Register a closure to be called when the object changes.
didChangeSelectables() → void
Called when this delegate finishes updating the selectables.
dispatchSelectionEvent(SelectionEvent event) SelectionResult
Handles the SelectionEvent sent to this object.
dispatchSelectionEventToChild(Selectable selectable, SelectionEvent event) SelectionResult
Dispatches a selection event to a specific selectable.
dispose() → void
Discards any resources used by the object. After this is called, the object is not in a usable state and should be discarded (calls to addListener will throw after the object is disposed).
ensureChildUpdated(Selectable selectable) → void
Ensures the selectable child has received up to date selection event.
getSelectedContent() SelectedContent?
Copies the selected contents of all selectables.
getSelectionGeometry() SelectionGeometry
Gets the combined selection geometry for child selectables.
getTransformFrom(Selectable child) Matrix4
Gets the paint transform from the Selectable child to SelectionContainer of this delegate.
getTransformTo(RenderObject? ancestor) Matrix4
Gets the paint transform from the SelectionContainer of this delegate to the ancestor.
handleClearSelection(ClearSelectionEvent event) SelectionResult
Removes the selection of all selectables this delegate manages.
handleSelectAll(SelectAllSelectionEvent event) SelectionResult
Selects all contents of all selectables.
handleSelectionEdgeUpdate(SelectionEdgeUpdateEvent event) SelectionResult
Updates the selection edges.
handleSelectWord(SelectWordSelectionEvent event) SelectionResult
Selects a word in a selectable at the location SelectWordSelectionEvent.globalPosition.
layoutDidChange() → void
Notifies this delegate that layout of the container has changed.
noSuchMethod(Invocation invocation) → dynamic
Invoked when a non-existent method or property is accessed.
notifyListeners() → void
Call all the registered listeners.
pushHandleLayers(LayerLink? startHandle, LayerLink? endHandle) → void
Marks this handler to be responsible for pushing LeaderLayers for the selection handles.
remove(Selectable selectable) → void
Removes the selectable from the registrar.
removeListener(VoidCallback listener) → void
Remove a previously registered closure from the list of closures that are notified when the object changes.
toString() String
A string representation of this object.


operator ==(Object other) bool
The equality operator.