Dispose Image Release For Free

Disposal differs from garbage collection in that disposal is usually explicitly instigated; garbage collection is totally automatic. In other words, the programmer takes care of such things as releasing file handles, locks, and operating system resources while the CLR takes care of releasing memory.

Deactivate is called when the widget is removed from the tree. However the framework may decide to reinsert into another part of the widget tree. For example, when you are reordering a list of items! dispose is called when the widget is removed from the tree permanently!

Flutter ? dispose() Method with Example It is generally overridden and called only when the state object is destroyed. Dispose releases the memory allocated to the existing variables of the state. It is only used in a stateful widget because you cannot change the state of a stateless widget.

The clear() method would empty the entered string text and set its default value is empty. dispose() would discard any resources used by the object.

Release this handle's claim on the underlying Image. This handle is no longer usable after this method is called. Once all outstanding handles have been disposed, the underlying image will be disposed as well.

Dispose method In initState, subscribe to the object. In didUpdateWidget unsubscribe from the old object and subscribe to the new one if the updated widget configuration requires replacing the object. In dispose, unsubscribe from the object.

The Dispose method leaves the Image in an unusable state. After calling Dispose, you must release all references to the Image so the garbage collector can reclaim the memory that the Image was occupying.

Dispose improves performance and optimizes memory by releasing unmanageable objects and scarce resources, like Graphics Device Interface (GDI) handles used in applications with restricted Windows space. The Dispose method, provided by the IDisposable interface, implements Dispose calls.

As you are returning the newly created bitmap, you cannot dispose it within the method (or else it would not be usable any more by the callers of the method). Therefore, it is within the responsibility of the callers to dispose of the bitmap once it is not required any longer.

Calling Dispose allows the resources used by this Graphics to be reallocated for other purposes.