Is it possible we can add onPressed action on the logo and start another activity?
I am creating a simple flutter app where I have used AppBar and in leading icon I have used a custom logo. I am not sure how to perform onPressed method so that it starts another activity. Anyone please help me here. Below is my app bar code.
class SecondScreen extends StatelessWidget {
#override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
leading: Padding(
padding: const EdgeInsets.all(8.0),
child: Image.asset(
"assets/images/logo.png",
),
),
title: Text('Safe Outs Business'),
),
body: Center(
child: Text('Admin HomePage'),
),
);
}
}
Click here to see a sample Image of the layout I am trying to build in flutter
You can embed your logo inside a GestureDetector:
return Scaffold(
appBar: AppBar(
leading: Padding(
padding: const EdgeInsets.all(8.0),
child: GestureDetector(
onTap: () => print('TAPPED!'),
child: Image.asset(
"assets/images/logo.png",
),
),
),
title: Text('Safe Outs Business'),
),
body: Center(
child: Text('Admin HomePage'),
),
);
Related
Working on a flutter web project. I have a row which has 3 widgets:
From left to right:
Sidebar
Sidebar content
body
Widget _buildBody() {
final screenwidth = MediaQuery.of(context).size.width;
editpanel = screenwidth * 0.3;
final editor = ViewProvider.of(context).isEditPanelOpen
? (screenwidth - sidebar - editpanel)
: (screenwidth - sidebar);
final ViewProvider viewProvider = Provider.of<ViewProvider>(context);
return Row(
Sidebar()
_loadSidebarContent(bloc.editPanelIndex),
_sidebarHandler(viewProvider),
Center(
child: SizedBox(
width: editor * 0.8,
child: Center(
child: MyWidget(),
),
),
),
],
);
}
I need to register tap if user taps on anything except the Appbar, Sidebar, Sidebarcontent, on MyWidget.
So I wrapped the entire scaffold with gesture detector and tried using IgnorePointer for the specific widgets.
Widget build(BuildContext context) {
return GestureDetector(
onTap: () {
.. call some specific function
},
child: Scaffold(
backgroundColor: Colors.white,
appBar: PreferredSize(
preferredSize: Size(
MediaQuery.of(context).size.width,
height + 80,
),
child: IgnorePointer(
child: Appbar(),
ignoring: true,
),
),
body: _buildBody(),
),
);
}
Issue is: MyWidget is getting ignored all the time. I don't want to fire the specificFunc() when user taps on any of the: Appbar, Sidebar, Sidebarcontent, or MyWidget.
Basically if user taps the white space around MyWidget specificFunction will be called
Wrap the whole Scaffold widget with GestureDector is not a good idea.
Instead wrap the container (white space around your button) with the detector and supply the button as a child.
In the following sample, the amber area is your white one. Tapping the amber area, and the button produces a separate log.
class _MyHomePageState extends State<MyHomePage> {
#override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text(widget.title),
),
body: Center(
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
Expanded(
child: GestureDetector(
onTap: () {
if (kDebugMode) {
print('Amber area tapped!');
}
},
child: Container(
color: Colors.amber,
width: 400,
height: 400,
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
TextButton(
style: ButtonStyle(
foregroundColor:
MaterialStateProperty.all<Color>(Colors.blue),
backgroundColor: MaterialStateProperty.all<Color>(
Colors.white)),
onPressed: () {
if (kDebugMode) {
print('Button clicked.');
}
},
child: const Text('A Button'),
),
],
)),
),
)
],
),
),
);
}
}
You could use a stack (https://api.flutter.dev/flutter/widgets/Stack-class.html) and wrap the widget at the very bottom of the stack with a gesture detector.
To position the other widgets correctly, you could use the Positioned widget.
Instead of ignorePointer you should be using AbsorbPointer which will absorb the pointer and not pass it to the content below it
There are plenty Bottom Navigator Bar tutorial in internet but almost all of them suggesting to put the Navigate method into Scaffold's body.
Here is my final Navigate and it works if I put into Scaffold's body:
showPage(_selectedIndex)
but the problem is I am using on same page Tabbar and BottomNavigatorBar together. Here is the current situation (Scaffold's body)
body: TabBarView(
children: [
for (final tab in filteredList)
NewsView(
id: tab.id!,
),
],
),
unfortunately I could not find a way to put or integrate showPage(_selectedIndex)
P.S. the tabs generating dynamically from JSON.
The Scaffold Widget has a ButtonNavigationBar property besides de body. If it’s about navigation you can definitely add a button and pass the reference to the Class or Page you want to navigate to in its ‘onPressed () {}’ property. This is an example from the official documentation:
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: const Text('Sample Code'),
),
body: Center(
child: Text('You have pressed the button $_count times.'),
),
bottomNavigationBar: BottomAppBar(
shape: const CircularNotchedRectangle(),
child: Container(height: 50.0),
),
floatingActionButton: FloatingActionButton(
onPressed: () => setState(() {
_count++;
}),
tooltip: 'Increment Counter',
child: const Icon(Icons.add),
),
floatingActionButtonLocation: FloatingActionButtonLocation.centerDocked,
);
}
Here’s the link https://api.flutter.dev/flutter/material/Scaffold-class.html
the final solution:
body: Center(
child: _selectedIndex != 0
? showPage(_selectedIndex)
: TabBarView(
children: [
for (final tab in filteredList)
NewsView(
id: tab.id!,
),
],
),
),
I want to open a drawer after pushing on the custom button in BottomMenu I have trouble with Scaffold.of(context).openDrawer(), it doesn't work. My BottomMenu is a separate widget class. As I understand, it doesn't work because it's a separate context. How can I get the right context? Or perhaps someone knows another solution.
Here my code reproducer:
import 'package:flutter/material.dart';
void main() => runApp(MyApp());
class MyApp extends StatelessWidget {
// This widget is the root of your application.
#override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Flutter Demo',
home: MyHomePage(title: 'Flutter Drawer'),
);
}
}
class MyHomePage extends StatefulWidget {
MyHomePage({Key key, this.title}) : super(key: key);
final String title;
#override
_MyHomePageState createState() => _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> {
#override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text(widget.title),
),
bottomNavigationBar: BottomMenu(),
endDrawer: SizedBox(
width: double.infinity,
child: Drawer(
elevation: 16,
child: Container(
color: Colors.black,
child: ListView(
padding: EdgeInsets.zero,
children: <Widget>[
ListTile(
title: Text('Some context here',
style: TextStyle(color: Colors.white))),
ListTile(
title: Text('Some context here',
style: TextStyle(color: Colors.white))),
],
),
),
),
),
body: Center(
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
Text(
'Call Drawer form menu reproducer',
)
],
),
),
);
}
}
class BottomMenu extends StatelessWidget {
#override
Widget build(BuildContext context) {
return Padding(
padding: const EdgeInsets.symmetric(horizontal: 15),
child: Wrap(
alignment: WrapAlignment.center,
children: <Widget>[
Divider(color: Colors.black, height: 1),
Padding(
padding: const EdgeInsets.symmetric(vertical: 2),
child: Row(
mainAxisSize: MainAxisSize.max,
mainAxisAlignment: MainAxisAlignment.end,
children: <Widget>[
InkWell(
borderRadius: new BorderRadius.circular(20.0),
customBorder: Border.all(color: Colors.black),
child: Container(
padding: EdgeInsets.only(
left: 3, right: 6, bottom: 15, top: 11),
child: Row(
children: <Widget>[
Icon(Icons.menu),
Text('Show menu', style: TextStyle(fontSize: 15, fontWeight: FontWeight.bold)),
],
),
),
onTap: () {
Scaffold.of(context).openDrawer();
},
),
],
),
),
],
),
);
}
}
In my case, this worked.
return Scaffold(
key: _scaffoldKey,
endDrawerEnableOpenDragGesture: false, // This!
appBar: AppBar(
iconTheme: IconThemeData(color: Colors.white),
leading: IconButton(
icon: Icon(Icons.menu, size: 36),
onPressed: () => _scaffoldKey.currentState.openDrawer(), // And this!
),
),
drawer: DrawerHome(),
....
and _scaffoldKey must be initialized as,
final GlobalKey<ScaffoldState> _scaffoldKey = GlobalKey<ScaffoldState>();
under the class.
The problem is that you specified endDrawer on Scaffold yet you're calling Scaffold.of(context).openDrawer().
openDrawer() documentation states:
If the scaffold has a non-null Scaffold.drawer, this function will cause the drawer to begin its entrance animation.
Since your drawer is null, nothing happens.
In contrast, openEndDrawer() informs us:
If the scaffold has a non-null Scaffold.endDrawer, this function will cause the end side drawer to begin its entrance animation.
Since your endDrawer is not null you should use openEndDrawer() method. Alternatively, if you don't care which side the drawer slides in from, you can use drawer instead of endDrawer when building Scaffold.
My problem solved that instead of
Scaffold.of(context).openEndDrawer()
I give key to Scaffold and then I call by state like below
_scaffoldkey.currentState.openEndDrawer()
It solved my problem I hope It also works for you
Scaffold.of(context).openEndDrawer()
The Problem
This issue can occur when you do not use the correct BuildContext when calling Scaffold.of(context).openDrawer() (or openEndDrawer()).
Easiest Solution
Simply wrap whatever calls openDrawer() (or openEndDrawer()) with a Builder widget. This will give it a working context.
Minimal Working Example
// your build method
#override
Widget build(BuildContext context) {
return Scaffold(
floatingActionButton: Builder(builder: (context) { // this uses the new context to open the drawer properly provided by the Builder
return FloatingActionButton(onPressed: (() => Scaffold.of(context).openDrawer()));
}),
drawer: const Drawer(
child: Text("MY DRAWER"),
),
);
}
Similar problem here. Clicked on button and nothing happened. The problem is I was using the context of the widget that instantiated Scaffold. Not the context of a child of Scaffold.
Here is how I solved it:
// body: Column(
// children: <Widget>[
// Row(
// children: <Widget>[
// IconButton(
// icon: Icon(Icons.filter_list),
// onPressed: () => Scaffold.of(context).openEndDrawer(), (wrong context)
// ),
// ],
// ),
// ],
// )
To:
body: Builder(
builder: (context) => Column(
children: <Widget>[
Row(
children: <Widget>[
IconButton(
icon: Icon(Icons.filter_list),
onPressed: () => Scaffold.of(context).openEndDrawer(),
),
],
),
],
)),
),
Assign Drawer to drawer property in scaffold. Wrap your specific Widget/Button(where you want to open drawer on its click method) with Builder. Use below method on click property:
enter image description here
Scaffold.of(context).openDrawer();
If you have the appbar widget with an action button to launch the drawer and the drawer is never pushed please remember that you need to define after appbar: ... the endDrawer: YOURAppDrawerWIDGET(), or else using the Scaffold.of(context).openEndDrawer() will not work.
Scaffold(
appBar: AppBar(title: Text(_title)),
endDrawer: AppDrawer(), // <-- this is required or else it will not know what is opening
body: SingleChildScrollView(
///...
I get this curious error for following simple code:
The named parameter children isnt defined.
import 'package:flutter/material.dart';
class Test extends StatelessWidget {
#override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text('Welcome to Flutter'),
),
body: Center(
children: <Widget>[
Text('Hello World'),
RaisedButton(
onPressed: null,
child: const Text('Disabled Button'),
)
]),
);
}
}
Can anyone spot the mistake? I think I am blind...
Best Regards.
Center doesn't accept children, only child (one widget), you can add a Column inside your Center
Center(
child: Column(children: <Widget>[
Text('Hello World'),
RaisedButton(
onPressed: null,
child: const Text('Disabled Button'),
)
])
),
I've implemented a Drawer in my Flutter app.
Closed Drawer:
Opened Drawer:
As you can see, the Drawer is on top of the Appbar. Before I started the app on Flutter, we had a native Android app with a Drawer that used to look like this:
Closed Drawer:
Opened Drawer:
Here is my code:
class MyDrawer extends StatelessWidget {
#override
Widget build(BuildContext context) {
return _buildDrawer(context);
}
}
Widget _buildDrawer(BuildContext context) {
return new Drawer(
child: new ListView(
children: <Widget>[
_buildDrawerItem(context, EnumDrawerItem.PROJECT_SELECTION, Icons.home, Colors.transparent),
new Divider(height: 20.0),
_buildDrawerItem(context, EnumDrawerItem.TASK_LIST, Icons.home, Colors.transparent),
new Divider(),
_buildDrawerItem(context, EnumDrawerItem.GUIDED_TASKS, Icons.home, Colors.transparent),
new Divider(),
_buildDrawerItem(context, EnumDrawerItem.PHOTOS, Icons.home, Colors.transparent),
new Divider(),
_buildDrawerItem(context, EnumDrawerItem.DOCUMENTS, Icons.home, Colors.transparent),
new Divider(),
_buildDrawerItem(context, EnumDrawerItem.LOG_OUT, Icons.home, const Color(0x85bf0202)),
new Divider(),
],
),
);
}
Widget _buildDrawerItem(BuildContext context, EnumDrawerItem drawerItem, IconData iconData, Color color) {
return Container(
color: color,
child: new Padding(
padding: new EdgeInsets.all(7.0),
child: new Row(
children: <Widget>[
new Icon(iconData),
new Container(
margin: new EdgeInsets.fromLTRB(10.0, 0.0, 0.0, 0.0),
child: new Text(
drawerItem.toString(),
style: styleDrawerItem,
),
),
],
),
),
);
}
I know this is the standard Material Design style, but the client wants it as it was before.
Would it be possible to implemented it as in the 2 last screenshots? Do you have any idea?
Wrap your main Scaffold in another Scaffold and use the drawer of child Scaffold also make sure to set automaticallyImplyLeading to false so you don't get back icon in the AppBar
UPDATE :
i don't recommend this way because of this issue
return Scaffold(
primary: true,
appBar: AppBar(
title: Text("Parent Scaffold"),
automaticallyImplyLeading: false,
),
body: Scaffold(
drawer: Drawer(),
),
);
Final Result :
I use the key in scaffold and references in leading in scaffold principal how in the example
GlobalKey<ScaffoldState> _scaffoldKey = new GlobalKey();
return Scaffold(
appBar: AppBar(
title: Text('Draw'),
leading: IconButton(
icon: Icon(Icons.dehaze),
onPressed: () {
if (_scaffoldKey.currentState.isDrawerOpen == false) {
_scaffoldKey.currentState.openDrawer();
} else {
_scaffoldKey.currentState.openEndDrawer();
}
})),
body: Scaffold(
key: _scaffoldKey,
drawer: Drawer(),
body: Center(
child: Text('Drawer'),
),
),
);
Try this one:
class HomePage extends StatelessWidget {
#override
Widget build(BuildContext context) {
var statusBarHeight = MediaQuery.of(context).padding.top;
var appBarHeight = kToolbarHeight; //this value comes from constants.dart and equals to 56.0
return Scaffold(
drawerScrimColor: Colors.transparent,
appBar: AppBar(),
drawer: Container(
padding: EdgeInsets.only(top: statusBarHeight+ appBarHeight + 1),//adding one pixel for appbar shadow
width: MediaQuery.of(context).size.width,
child: Drawer(),//write your drawer code
),
body: AnyBody(), //add your body
bottomNavigationBar: AnyNavigationBar(), //add your navigation bar
);
}
}
Simple and to the point:
drawer: Padding(
padding: const EdgeInsets.fromLTRB(0, 80, 0, 0),
child: Drawer(),