addListener method Null safety Adds a listener callback that is called whenever a new concrete ImageInfo object is available or an error is reported . If a concrete image is already available, or if an error has been already reported, this object will notify the listener synchronously.
Read moreWhat is the use of add listener in Flutter?
addListener method Null safety Adds a listener callback that is called whenever a new concrete ImageInfo object is available or an error is reported . If a concrete image is already available, or if an error has been already reported, this object will notify the listener synchronously.
Read moreWhat is ValueListenableBuilder?
ValueListenableBuilder will listen for changes to a value notifier and automatically rebuild its children when the value changes . If you have more complex data, create a custom notifier for your data classes by extending ValueNotifier.
Read moreWhat is value notifier flutter?
ValueNotifier is a special type of class that extends Changenotifier , which can hold a single value and notifies the widgets which are listening to it whenever its holding value gets change.
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