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Flutter widgets are built using a modern framework that takesinspiration from React. The central idea is that you buildyour UI out of widgets. Widgets describe what their viewshould look like given their current configuration and state.When a widget’s state changes, the widget rebuilds its description,which the framework diffs against the previous description in orderto determine the minimal changes needed in the underlying rendertree to transition from one state to the next.
Note: If you would like to become better acquainted with Flutter by diving into some code, check out basic layout codelab, building layouts, and adding interactivity to your Flutter app.
Hello world
The minimal Flutter app simply calls the
runApp()
function with a widget:The
runApp()
function takes the givenWidget
and makes it the root of the widget tree.In this example, the widget tree consists of two widgets,the Center
widget and its child, the Text
widget.The framework forces the root widget to cover the screen,which means the text “Hello, world” ends up centered on screen.The text direction needs to be specified in this instance;when the MaterialApp
widget is used,this is taken care of for you, as demonstrated later.When writing an app, you’ll commonly author new widgets thatare subclasses of either
StatelessWidget
or StatefulWidget
,depending on whether your widget manages any state.A widget’s main job is to implement a build()
function,which describes the widget in terms of other, lower-level widgets.The framework builds those widgets in turn until the processbottoms out in widgets that represent the underlying RenderObject
,which computes and describes the geometry of the widget.Basic widgets
Flutter comes with a suite of powerful basic widgets,of which the following are commonly used:
Text
- The
Text
widget lets you create a run of styled textwithin your application. Row
,Column
- These flex widgets let you create flexible layouts inboth the horizontal (
Row
) and vertical (Column
) directions.The design of these objects is based on the web’sflexbox layout model. Stack
- Instead of being linearly oriented (either horizontally or vertically),a
Stack
widget lets you place widgets on top of each other in paint order.You can then use thePositioned
widget on children of aStack
to position them relative to the top, right, bottom,or left edge of the stack. Stacks are based on the web’sabsolute positioning layout model. Container
- The
Container
widget lets you create a rectangular visual element.A container can be decorated with aBoxDecoration
, such as abackground, a border, or a shadow. AContainer
can also have margins,padding, and constraints applied to its size. In addition, aContainer
can be transformed in three dimensional space using a matrix.
Below are some simple widgets that combine these and other widgets:
Be sure to have a
uses-material-design: true
entry in the flutter
section of your pubspec.yaml
file. It allows you to use the predefinedset of Material icons. It’s generally a good idea to include this lineif you are using the Materials library.Many Material Design widgets need to be inside of a
MaterialApp
to display properly, in order to inherit theme data.Therefore, run the application with a MaterialApp
.The
MyAppBar
widget creates a Container
with a height of 56device-independent pixels with an internal padding of 8 pixels,both on the left and the right. Inside the container,MyAppBar
uses a Row
layout to organize its children.The middle child, the title
widget, is marked as Expanded
,which means it expands to fill any remaining available spacethat hasn’t been consumed by the other children.You can have multiple Expanded
children and determine theratio in which they consume the available space using theflex
argument to Expanded
.The
MyScaffold
widget organizes its children in a vertical column.At the top of the column it places an instance of MyAppBar
,passing the app bar a Text
widget to use as its title.Passing widgets as arguments to other widgets is a powerful techniquethat lets you create generic widgets that can be reused in a widevariety of ways. Finally, MyScaffold
uses anExpanded
to fill the remaining space with its body,which consists of a centered message.For more information, see Layouts.
Using Material Components
Flutter provides a number of widgets that help you build appsthat follow Material Design. A Material app starts with the
MaterialApp
widget, which builds a number of useful widgetsat the root of your app, including a Navigator
,which manages a stack of widgets identified by strings,also known as “routes”. The Navigator
lets you transition smoothlybetween screens of your application. Using the MaterialApp
widget is entirely optional but a good practice.Now that the code has switched from
MyAppBar
and MyScaffold
to theAppBar
and Scaffold
widgets, and from material.dart
,the app is starting to look a bit more Material.For example, the app bar has a shadow and the title text inherits thecorrect styling automatically. A floating action button is also added.Notice that widgets are passed as arguments to other widgets.The
Scaffold
widget takes a number of different widgets asnamed arguments, each of which are placed in the Scaffold
layout in the appropriate place. Similarly, theAppBar
widget lets you pass in widgets for theleading
widget, and the actions
of the title
widget.This pattern recurs throughout the framework and is something youmight consider when designing your own widgets.For more information, see Material Components widgets.
Note: Material is one of the 2 bundled designs included with Flutter. To create an iOS-centric design, see the Cupertino components package, which has its own versions of
CupertinoApp
, and CupertinoNavigationBar
.Handling gestures
Most applications include some form of user interaction with the system.The first step in building an interactive application is to detectinput gestures. See how that works by creating a simple button:
The
GestureDetector
widget doesn’t have a visualrepresentation but instead detects gestures made by theuser. When the user taps the Container
,the GestureDetector
calls its onTap()
callback, in thiscase printing a message to the console. You can useGestureDetector
to detect a variety of input gestures,including taps, drags, and scales.Many widgets use a
GestureDetector
to provideoptional callbacks for other widgets. For example, theIconButton
, ElevatedButton
, andFloatingActionButton
widgets have onPressed()
callbacks that are triggered when the user taps the widget.For more information, see Gestures in Flutter.
Changing widgets in response to input
Download Menu Butler Widget For Mac 2.0 64
So far, this page has used only stateless widgets.Stateless widgets receive arguments from their parent widget,which they store in
final
member variables.When a widget is asked to build()
, it uses these storedvalues to derive new arguments for the widgets it creates.In order to build more complex experiences—for example,to react in more interesting ways to user input—applicationstypically carry some state. Flutter uses
StatefulWidgets
to capturethis idea. StatefulWidgets
are special widgets that know how to generateState
objects, which are then used to hold state.Consider this basic example, using the ElevatedButton
mentioned earlier:You might wonder why
StatefulWidget
and State
are separate objects.In Flutter, these two types of objects have different life cycles.Widgets
are temporary objects, used to construct a presentation ofthe application in its current state. State
objects, on the otherhand, are persistent between calls tobuild()
, allowing them to remember information.The example above accepts user input and directly usesthe result in its
build()
method. In more complex applications,different parts of the widget hierarchy might beresponsible for different concerns; for example, onewidget might present a complex user interfacewith the goal of gathering specific information,such as a date or location, while another widget mightuse that information to change the overall presentation.In Flutter, change notifications flow “up” the widgethierarchy by way of callbacks, while current state flows“down” to the stateless widgets that do presentation.The common parent that redirects this flow is the
State
.The following slightly more complex example shows howthis works in practice:Notice the creation of two new stateless widgets,cleanly separating the concerns of displaying the counter(
CounterDisplay
) and changing the counter (CounterIncrementor
).Although the net result is the same as the previous example,the separation of responsibility allows greater complexity tobe encapsulated in the individual widgets,while maintaining simplicity in the parent.For more information, see:
Bringing it all together
What follows is a more complete example that brings togetherthese concepts: A hypothetical shopping application displays variousproducts offered for sale, and maintains a shopping cart forintended purchases. Start by defining the presentation class,
ShoppingListItem
:The
ShoppingListItem
widget follows a common patternfor stateless widgets. It stores the values it receivesin its constructor in final
member variables,which it then uses during its build()
function.For example, the inCart
boolean toggles between two visualappearances: one that uses the primary color from the currenttheme, and another that uses gray.When the user taps the list item, the widget doesn’t modifyits
inCart
value directly. Instead, the widget calls theonCartChanged
function it received from its parent widget.This pattern lets you store state higher in the widgethierarchy, which causes the state to persist for longer periods of time.In the extreme, the state stored on the widget passed torunApp()
persists for the lifetime of theapplication.When the parent receives the
onCartChanged
callback,the parent updates its internal state, which triggersthe parent to rebuild and create a new instanceof ShoppingListItem
with the new inCart
value.Although the parent creates a new instance ofShoppingListItem
when it rebuilds, that operation is cheapbecause the framework compares the newly built widgets with the previouslybuilt widgets and applies only the differences to the underlyingRenderObject
.Here’s an example parent widget that stores mutable state:
The
ShoppingList
class extends StatefulWidget
,which means this widget stores mutable state.When the ShoppingList
widget is first insertedinto the tree, the framework calls the createState()
functionto create a fresh instance of _ShoppingListState
to associate with thatlocation in the tree. (Notice that subclasses ofState
are typically named with leading underscores toindicate that they are private implementation details.)When this widget’s parent rebuilds, the parent creates a new instanceof ShoppingList
, but the framework reuses the _ShoppingListState
instance that is already in the tree rather than callingcreateState
again.To access properties of the current
ShoppingList
,the _ShoppingListState
can use its widget
property.If the parent rebuilds and creates a new ShoppingList
,the _ShoppingListState
rebuilds with the new widget value.If you wish to be notified when the widget
property changes,override the didUpdateWidget()
function, which is passedan oldWidget
to let you compare the old widget withthe current widget.When handling the
onCartChanged
callback, the _ShoppingListState
mutates its internal state by either adding or removing a product from_shoppingCart
. To signal to the framework that it changed its internalstate, it wraps those calls in a setState()
call.Calling setState
marks this widget as dirty and schedules it to be rebuiltthe next time your app needs to update the screen.If you forget to call setState
when modifying the internalstate of a widget, the framework won’t know your widget isdirty and might not call the widget’s build()
function,which means the user interface might not update to reflectthe changed state. By managing state in this way,you don’t need to write separate code for creating andupdating child widgets. Instead, you simply implement the build
function, which handles both situations.Responding to widget lifecycle events
After calling
createState()
on the StatefulWidget
,the framework inserts the new state object into the tree andthen calls initState()
on the state object.A subclass of State
can override initState
to do workthat needs to happen just once. For example, override initState
to configure animations or to subscribe to platform services.Implementations of initState
are required to startby calling super.initState
.When a state object is no longer needed,the framework calls
dispose()
on the state object.Override the dispose
function to do cleanup work.For example, override dispose
to cancel timers or tounsubscribe from platform services. Implementations ofdispose
typically end by calling super.dispose
.For more information, see
State
.Keys
Use keys to control which widgets the framework matches upwith other widgets when a widget rebuilds. By default, theframework matches widgets in the current and previous buildaccording to their
runtimeType
and the order in which they appear.With keys, the framework requires that the two widgets havethe same key
as well as the same runtimeType
.Keys are most useful in widgets that build many instances ofthe same type of widget. For example, the
ShoppingList
widget,which builds just enough ShoppingListItem
instances tofill its visible region:- Without keys, the first entry in the current buildwould always sync with the first entry in the previous build,even if, semantically, the first entry in the list justscrolled off screen and is no longer visible in the viewport.
- By assigning each entry in the list a “semantic” key,the infinite list can be more efficient because theframework syncs entries with matching semantic keysand therefore similar (or identical) visual appearances.Moreover, syncing the entries semantically means thatstate retained in stateful child widgets remains attachedto the same semantic entry rather than the entry in thesame numerical position in the viewport.
For more information, see the
Key
API.Global keys
Use global keys to uniquely identify child widgets.Global keys must be globally unique across the entirewidget hierarchy, unlike local keys which needonly be unique among siblings. Because they areglobally unique, a global key can be used toretrieve the state associated with a widget.
For more information, see the
GlobalKey
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