MultiSelectableSelectionContainerDelegate class abstract

A delegate that handles events and updates for multiple Selectable children.

Updates are optimized by tracking which Selectables reside on the edges of a selection. Subclasses should implement ensureChildUpdated to describe how a Selectable should behave when added to a selection.

Inheritance
Mixed in types

Constructors

MultiSelectableSelectionContainerDelegate()
Creates an instance of MultiSelectableSelectionContainerDelegate.

Properties

compareOrder → Comparator<Selectable>
The compare function this delegate used for determining the selection order of the selectables.
no setter
containerSize → Size
Gets the size of the SelectionContainer of this delegate.
no setterinherited
currentSelectionEndIndex ↔ int
The current Selectable that contains the selection end edge.
getter/setter pair
currentSelectionStartIndex ↔ int
The current Selectable that contains the selection start edge.
getter/setter pair
hashCode → int
The hash code for this object.
no setterinherited
hasListeners → bool
Whether any listeners are currently registered.
no setterinherited
hasSize → bool
Whether the SelectionContainer has undergone layout and has a size.
no setterinherited
runtimeType → Type
A representation of the runtime type of the object.
no setterinherited
selectables ↔ List<Selectable>
Gets the list of Selectables this delegate is managing.
getter/setter pair
value → SelectionGeometry
The current value of the object. When the value changes, the callbacks registered with addListener will be invoked.
no setteroverride

Methods

add(Selectable selectable) → void
Adds the selectable into the registrar.
override
addListener(VoidCallback listener) → void
Register a closure to be called when the object changes.
inherited
didChangeSelectables() → void
Called when this delegate finishes updating the Selectables.
dispatchSelectionEvent(SelectionEvent event) → SelectionResult
Handles the SelectionEvent sent to this object.
override
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).
override
ensureChildUpdated(Selectable selectable) → void
Ensures the Selectable child has received up to date selection event.
getSelectedContent() → SelectedContent?
Copies the selected contents of all Selectables.
override
getSelectionGeometry() → SelectionGeometry
Gets the combined SelectionGeometry for child Selectables.
getTransformFrom(Selectable child) → Matrix4
Gets the paint transform from the Selectable child to SelectionContainer of this delegate.
inherited
getTransformTo(RenderObject? ancestor) → Matrix4
Gets the paint transform from the SelectionContainer of this delegate to the ancestor.
inherited
handleClearSelection(ClearSelectionEvent event) → SelectionResult
Removes the selection of all Selectables this delegate manages.
handleDirectionallyExtendSelection(DirectionallyExtendSelectionEvent event) → SelectionResult
Extend current selection in a certain TextGranularity.
handleGranularlyExtendSelection(GranularlyExtendSelectionEvent event) → SelectionResult
Extend current selection in a certain TextGranularity.
handleSelectAll(SelectAllSelectionEvent event) → SelectionResult
Selects all contents of all Selectables.
handleSelectionEdgeUpdate(SelectionEdgeUpdateEvent event) → SelectionResult
Updates the selection edges.
handleSelectParagraph(SelectParagraphSelectionEvent event) → SelectionResult
Selects a paragraph in a Selectable at the location SelectParagraphSelectionEvent.globalPosition.
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 nonexistent method or property is accessed.
inherited
notifyListeners() → void
Call all the registered listeners.
inherited
pushHandleLayers(LayerLink? startHandle, LayerLink? endHandle) → void
Marks this handler to be responsible for pushing LeaderLayers for the selection handles.
override
remove(Selectable selectable) → void
Removes the selectable from the registrar.
override
removeListener(VoidCallback listener) → void
Remove a previously registered closure from the list of closures that are notified when the object changes.
inherited
toString() → String
A string representation of this object.
inherited

Operators

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