ViewportController class

Manages the viewer's zoom/pan state. The widget layer binds gestures (InteractiveViewer, scroll wheel, trackpad) to these setters.

Inheritance

Constructors

ViewportController({double initialScale = 1.0, Offset initialOffset = Offset.zero, double minScale = 0.1, double maxScale = 5.0})

Properties

hashCode → int
The hash code for this object.
no setterinherited
hasListeners → bool
Whether any listeners are currently registered.
no setterinherited
maxScale → double
final
minScale → double
final
runtimeType → Type
A representation of the runtime type of the object.
no setterinherited
state → ViewportState
no setter

Methods

addListener(VoidCallback listener) → void
Register a closure to be called when the object changes.
inherited
dispose() → void
Discards any resources used by the object.
inherited
fit(Size contentSize, Size viewportSize) → void
Fit contentSize inside viewportSize (contain), centered.
noSuchMethod(Invocation invocation) → dynamic
Invoked when a nonexistent method or property is accessed.
inherited
notifyListeners() → void
Call all the registered listeners.
inherited
pan(Offset delta) → void
removeListener(VoidCallback listener) → void
Remove a previously registered closure from the list of closures that are notified when the object changes.
inherited
reset() → void
setOffset(Offset offset) → void
setScale(double value) → void
toString() → String
A string representation of this object.
inherited
zoomAt(Offset center, double factor) → void
Zoom while keeping center (in viewport-local coordinates) stable.

Operators

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