How can the cursor appearance be changed within Flutter? I know that with the Listener() Widget we can listen for Mouse-Events, but I haven't found any information regarding hovering events for flutter web.
Has someone found a soulution yet?
-
SO is Q&A site, we don not include answers in question posts. If you wish, then post an answerVega– Vega2024年02月21日 13:00:46 +00:00Commented Feb 21, 2024 at 13:00
9 Answers 9
I had difficulties finding documentation on the now built-in support. Here is what helped me: https://github.com/flutter/flutter/issues/58260
And this did the trick for me, without changing index.html etc.
MouseRegion(
cursor: SystemMouseCursors.click,
child: GestureDetector(
child: Icon(
Icons.add_comment,
size: 20,
),
onTap: () {},
),
),
Also see the official documentation: https://api.flutter.dev/flutter/rendering/MouseCursor-class.html
Widget build(BuildContext context) {
return Center(
child: MouseRegion(
cursor: SystemMouseCursors.text,
child: Container(
width: 200,
height: 100,
decoration: BoxDecoration(
color: Colors.blue,
border: Border.all(color: Colors.yellow),
),
),
),
);
}
And here https://api.flutter.dev/flutter/material/MaterialStateMouseCursor-class.html yet another wonderful example from the official docs that "...defines a mouse cursor that resolves to SystemMouseCursors.forbidden when its widget is disabled."
5 Comments
import 'package:flutter/rendering.dart';DropdownButton its not work for this .Starting with dev channel build version 1.19.0–3.0.pre there is built-in support for the pointer cursor. The same method as bellow is used with the difference that is applied to the Flutter app container element flt-glass-pane. Using the bellow method will just duplicate the behavior.
In order to override the pointer cursor, you can use the bellow method but applied on the flt-glass-pane element.
A workaround for this is the following:
- You have to set an id (for example app-container on the entire body of the app's index.html template).
This is how your index.html will look like:
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>My awesome app</title>
</head>
<body id="app-container">
<script src="main.dart.js" type="application/javascript"></script>
</body>
</html>
- Next, you have to create a wrapper dart class. I called it hand_cursor.dart:
import 'package:flutter_web/gestures.dart';
import 'package:flutter_web/widgets.dart';
import 'package:universal_html/html.dart' as html;
// see https://pub.dev/packages/universal_html
class HandCursor extends MouseRegion {
// get a reference to the body element that we previously altered
static final appContainer = html.window.document.getElementById('app-container');
HandCursor({Widget child}) : super(
onHover: (PointerHoverEvent evt) {
appContainer.style.cursor='pointer';
// you can use any of these:
// 'help', 'wait', 'move', 'crosshair', 'text' or 'pointer'
// more options/details here: http://www.javascripter.net/faq/stylesc.htm
},
onExit: (PointerExitEvent evt) {
// set cursor's style 'default' to return it to the original state
appContainer.style.cursor='default';
},
child: child
);
}
- After that, wherever you want to have the hand cursor shown, you have to wrap your element in this HandCursor wrapper. See the class awesome_button.dart bellow:
import 'package:awesome_app/widgets/containers/hand_cursor.dart';
import 'package:flutter_web/material.dart';
import 'package:flutter_web/widgets.dart';
class AwesomeButton extends StatelessWidget {
@override
Widget build(BuildContext context) {
return Stack(
children: <Widget>[
HandCursor(
child: IconButton(
onPressed: () {
// do some magic
},
icon: Icon(Icons.star)
),
)
],
);
}
}
A short explanation can be found here.
A more versatile update, that works on the new web projects created with the master channel of Flutter, can be found here.
I hope it helps.
1 Comment
You can use an InkWell that has an onHover event
InkWell(
onTap: () {},
onHover: (value) {
setState(() {
isHovered = value;
});
},
child: Container(
width: 50,
height: 72,
color: Colors.black
)
);
Make sure to have something onTap, even an empty function, else it is considered to be disabled, and the hover won't work
Comments
The previous method is deprecated. Here is the updated code
import 'package:flutter/gestures.dart';
import 'package:flutter/widgets.dart';
import 'package:universal_html/prefer_sdk/html.dart' as html;
class HandCursor extends MouseRegion {
static final appContainer = html.window.document.getElementById('app-container');
HandCursor({Widget child})
: super(
onHover: (PointerHoverEvent evt) {
appContainer.style.cursor = 'pointer';
},
onExit: (PointerExitEvent evt) {
appContainer.style.cursor = 'default';
},
child: child,
);
}
And in your pubspec.yaml file, add universal_html as a package as a dependency. The version may change.
dependencies:
flutter:
sdk: flutter
universal_html: ^1.1.4
You still want to have an id of app-container attached to the body of your html. Here is my html file.
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Your App Title</title>
</head>
<body id="app-container">
<script src="main.dart.js" type="application/javascript"></script>
</body>
</html>
You want to put the code for the HandCursor widget in its own file. You can call it hand_cursor.dart. And to use it on the widget you want the hand to show up on, import it into the file you're working on and wrap the widget you want in the HandCursor widget.
Comments
The most easy way what I know is to use Inkwell.mouseCursor
InkWell(
onTap: (){},
mouseCursor: WidgetStateMouseCursor.clickable,
...
child: YourWidget()
)
Comments
From Flutter beta version 1.19.0-4.1.pre, add id to body and set cursor of that doesn't work. Because flt-glass-pane is replacing the cursor.
So the solution is that set cursor directly to flt-glass-pane.
Below is the update that is working.
class HandCursor extends MouseRegion {
static final appContainer = html.window.document.querySelectorAll('flt-glass-pane')[0];
HandCursor({Widget child}) : super(
onHover: (PointerHoverEvent evt) {
appContainer.style.cursor='pointer';
},
onExit: (PointerExitEvent evt) {
appContainer.style.cursor='default';
},
child: child
);
}
1 Comment
final appContainer
= html.document.getElementsByTagName('body')[0] as html.Element;
GestureDetector(
child: MouseRegion(
child: Text(
'https://github.com/yumi0629',
style: textStyle,
),
onHover: (_) => appContainer.style.cursor = 'pointer',
onExit: (_) => appContainer.style.cursor = 'default',
),
onTap: () {
print('open');
js.context.callMethod(
'open', ['https://github.com/yumi0629']);
},
)
Comments
I believe that mouse events won't work on the web, Listener Widget was demoed on Google I/O 2019 and worked with mouse, but that was as a ChromeOS app and not a web app.
According to Flutter web on GitHub:
At this time, desktop UI interactions are not fully complete, so a UI built with flutter_web may feel like a mobile app, even when running on a desktop browser.
Comments
Adapted answer by Constantin Stan
For those who want to have the click effect similar to InkWell widget and with border radius option:
Add to your pubspec.yaml file
dependencies:
universal_html: ^1.1.4
Then add to the index.html file the following the tag <body id="app-container"> as below:
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Your App Title</title>
</head>
<body id="app-container">
<script src="main.dart.js" type="application/javascript"></script>
</body>
</html>
Finally create the following widget and use encapsulated all the necessary widgets:
import 'package:flutter/foundation.dart';
import 'package:flutter/gestures.dart';
import 'package:flutter/material.dart';
import 'package:universal_html/prefer_sdk/html.dart' as html;
class InkWellMouseRegion extends InkWell {
InkWellMouseRegion({
Key key,
@required Widget child,
@required GestureTapCallback onTap,
double borderRadius = 0,
}) : super(
key: key,
child: !kIsWeb ? child : HoverAware(child: child),
onTap: onTap,
borderRadius: BorderRadius.circular(borderRadius),
);
}
class HoverAware extends MouseRegion {
// get a reference to the body element that we previously altered
static final appContainer = html.window.document.getElementById('app-container');
HoverAware({Widget child}) : super(
onHover: (PointerHoverEvent evt) {
appContainer.style.cursor='pointer';
// you can use any of these:
// 'help', 'wait', 'move', 'crosshair', 'text' or 'pointer'
// more options/details here: http://www.javascripter.net/faq/stylesc.htm
},
onExit: (PointerExitEvent evt) {
// set cursor's style 'default' to return it to the original state
appContainer.style.cursor='default';
},
child: child
);
}