I am having a problem with the smoothness of my app animation.
I have 20 buttons on this page. If I press any of the buttons, the click effect is not running smoothly. The frame rate is very low. Is there any problem with the code or it is a bug?
Thanks in advance.
Here is a slightly streamlined version of your button builder method that properly contains the ink effect in the rounded rectangle shape, but that should not impact performance. Performance-wise, there is nothing wrong with your code.
Widget buildMaterialButton() {
return Expanded(
child: RawMaterialButton(
fillColor: Colors.blueGrey,
shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(40.0)),
onPressed: () {},
child: Padding(
padding: const EdgeInsets.all(20.0),
child: Text("1"),
),
),
);
}
Related
I'm trying to center the minimized icon in this Icon Button but can't get it to work:
#override
Widget build(BuildContext context) {
return Row(
mainAxisAlignment: MainAxisAlignment.center,
children: [
SizedBox(
height: 25,
child: TextButton(
onPressed: appWindow.minimize,
style: const ButtonStyle(
alignment: Alignment.center,
padding: MaterialStatePropertyAll(EdgeInsets.all(0))),
child: const Icon(
Icons.minimize,
color: Colors.white,
),
),
),
TextButton(
onPressed: maximizeOrRestore,
child: Icon(
appWindow.isMaximized ? Icons.fullscreen_exit : Icons.fullscreen,
color: Colors.white,
)),
TextButton(
onPressed: appWindow.close,
child: const Icon(
Icons.close,
color: Colors.white,
),
)
],
);
}
I'm expecting the button to be centered and as you can see i've already tried using alignment and padding
When you say "center the minimized icon", do you mean that this icon should be between the other two icons? In that case, you just need to switch the first two widgets in the Row widget's children.
But I think you want the minimize icon to be higher so that it's something like-> - ◾️ X
If this is what you want then you can't use Icons.minimize. If you check out this icon on this page, you will notice that the minimize icon looks like an underscore. This is by design. I think this looks good, but if you insist on having a minus sign kind of symbol then you can use Icons.remove_rounded.
It's not that the icon is not centered, the Material minimize icon has blank space in the upper size, because it is suppose to be down to understand that is a minimize button just like the maximize button has blank space in the bottom size. What you can try is to use a different icon if you really want it to be centered. Try with Icons.horizontal_rule.
You can use CupertinoIcons.minus like
TextButton(
onPressed: appWindow.minimize,
child: const Icon(
CupertinoIcons.minus,
color: Colors.white,
),
),
I have this button in my app to change the language, and the button's icon is a round flag representing whatever language is currently selected. To make the user understand it's a button, I want to give it a little border so I looks more like a button, but I can't find a way to make the border round to match the icon.
So far, the best I can do is add a decoration to the icon with rounded corner, but it doesn't work. Here's the result and the code, any help is appreciated ! (I wonder if there is a solution that would adapt to the form of the image, if I change my mind a decide to use a rectangle image or a flag shaped, emoji type image. Thanks!)
return Padding(
padding: const EdgeInsets.all(10),
child: DropdownButton(
onChanged: (Language? lang) {
lang == null ? print("Null language error") : _changeLanguage(lang.languageCode);
},
underline: SizedBox(),
icon: Container(
decoration: BoxDecoration(
borderRadius: BorderRadius.circular(10),
color: Colors.blueGrey,
),
child: buttonIcon),
items: ...,
),
);
You could increase the radius of your BorderRadius to match the radius of the buttonIcon and give buttonIcon some padding.
Something like this:
return Padding(
padding: const EdgeInsets.all(10),
child: DropdownButton(
onChanged: (Language? lang) {
lang == null ? print("Null language error") : _changeLanguage(lang.languageCode);
},
underline: SizedBox(),
icon: Container(
decoration: BoxDecoration(
borderRadius: BorderRadius.circular(200), // you can adjust this value to your needs
color: Colors.blueGrey,
),
child: Padding(
padding: const EdgeInsets.all(10), // this value will be the width of your border
child: buttonIcon,
),
),
items: ...,
),
);
Solution given by Chirag Bargoojar in the comments.
What I did was create a CircleAvatar and give it another Circle avatar as a child, the first one creates the outer ring that works as the border.
Result:
Code:
icon: CircleAvatar(
radius: 22,
backgroundColor: Colors.blueGrey,
child: CircleAvatar(
backgroundImage: buttonIcon,
radius: 18,
),
),
I'm still going to look for the best possible color, but it does look pretty good this way!
I have created the following RaisedButton in Flutter:
The problem is, the button's highlightElevation triggers when you press and hold the button for approximately 1 second when I have the image shown on the left of it, but when I remove the image, it works as intended.
Is there a way to fix this while keeping the image?
here is my code:
Widget systems(String systemName, String systemTitle, Image img) {
return Center(child:
Container( width:width-20,height:110,child:
Column( children: <Widget>[
SizedBox(height: 10),
RaisedButton( elevation: 10,splashColor: Colors.transparent,highlightElevation: 0, shape:
RoundedRectangleBorder(
borderRadius: BorderRadius.circular(18.0),
),
color: Colors.white,
onPressed: () {},
child: Padding(
padding: EdgeInsets.only(left:0,top:15,bottom:15),
child: Row(children: [
img,Container(width:width-120,child:
Align(
alignment: Alignment.center,
child: Column(
children: [
Text(systemName, style: TextStyle(fontSize: 18)),
],
),
),)
])))
])));
}
PS: I have called this widget 9 times within a for loop in another widget, and when I reduce the number of the loop to 5 or lower, the button works as intended as well.
According to Flutter SDK highlightElevation is for the button's Material when the button is enabled and pressed.
Please refer https://api.flutter.dev/flutter/material/RawMaterialButton/highlightElevation.html
highlightElevation property :
The elevation for the button's Material when the button is enabled and pressed.
Inside a Wrap I have an array of StatelessWidget representing tags. Right now, the child widget simply returns a Chip. The build method for my Tag widget looks like:
Widget build(BuildContext context) {
return Chip(
label: Text('#the-tag-name'));
}
The Chips render like so:
I'd like to render smaller chips, so following the advice here, I've updated it to this:
Widget build(BuildContext context) {
return Transform(
transform: Matrix4.identity()..scale(0.8),
child: Chip(
label: Text('#the-tag-name')),
);
}
This is the result:
I'd like to retain the initial spacing between the Chips, but it seems that the transform isn't transforming the original layout size of the Chip:
The debug paint shows additional non-scaled padding to the right and bottom of each chip. Is there any way to remove this?
My advice would be to stay away from using Transform. It can lead to unintended consequences.
The reason your Chip padding won't go any smaller is because it is restricted by Material specifications. A clickable widget has a minimum tapTarget size. You can test this out by looking at the materialTapTargetSize on your chip.
CMD+click on the shringWrap and you will see that it says: "Shrinks the tap target size to the minimum provided by the Material specification."
Chip(
label: Text('#the-tag-name',
style: TextStyle(fontSize: 10.0)),
materialTapTargetSize: MaterialTapTargetSize.shrinkWrap,
),
So if you really need to shrink your widget, your best bet is to go another route. Possibly by using a RawMaterialButton like this: The padding and textSize can be adjusted as needed.
RawMaterialButton(
onPressed: () {},
constraints: BoxConstraints(),
padding: EdgeInsets.fromLTRB(8.0, 4.0, 8.0, 4.0),
child: Text(
'#the-tag-name',
style: new TextStyle(fontSize: 12.0),
),
shape: RoundedRectangleBorder(
borderRadius: new BorderRadius.circular(18.0),
),
fillColor: Colors.grey[300],
),
I want to have a row of IconButtons, all next to each other, but there seems to be pretty big padding between the actual icon, and the IconButton limits. I've already set the padding on the button to 0.
This is my component, pretty straightforward:
class ActionButtons extends StatelessWidget {
#override
Widget build(BuildContext context) {
return Container(
color: Colors.lightBlue,
margin: const EdgeInsets.all(0.0),
padding: const EdgeInsets.all(0.0),
child: Row(
mainAxisAlignment: MainAxisAlignment.start,
children: <Widget>[
IconButton(
icon: new Icon(ScanrIcons.reg),
alignment: Alignment.center,
padding: new EdgeInsets.all(0.0),
onPressed: () {},
),
IconButton(
icon: new Icon(Icons.volume_up),
alignment: Alignment.center,
padding: new EdgeInsets.all(0.0),
onPressed: () {},
)
],
),
);
}
}
I want to get rid of most of the light blue space, have my icons start earlier on the left, and closer to each other, but I can't find the way to resize the IconButton itself.
I'm almost sure this space is taken by the button itself, 'cause if I change their alignments to centerRight and centerLeft they look like this:
Making the actual icons smaller doesn't help either, the button is still big:
thanks for the help
Simply pass an empty BoxConstrains to the constraints property and a padding of zero.
IconButton(
padding: EdgeInsets.zero,
constraints: BoxConstraints(),
)
You have to pass the empty constrains because, by default, the IconButton widget assumes a minimum size of 48px.
Two ways to workaround this issue.
Still Use IconButton
Wrap the IconButton inside a Container which has a width.
For example:
Container(
padding: const EdgeInsets.all(0.0),
width: 30.0, // you can adjust the width as you need
child: IconButton(
),
),
Use GestureDetector instead of IconButton
You can also use GestureDetector instead of IconButton, recommended by Shyju Madathil.
GestureDetector( onTap: () {}, child: Icon(Icons.volume_up) )
It's not so much that there's a padding there. IconButton is a Material Design widget which follows the spec that tappable objects need to be at least 48px on each side. You can click into the IconButton implementation from any IDEs.
You can also semi-trivially take the icon_button.dart source-code and make your own IconButton that doesn't follow the Material Design specs since the whole file is just composing other widgets and is just 200 lines that are mostly comments.
Wrapping the IconButton in a container simply wont work, instead use ClipRRect and add a material Widget with an Inkwell, just make sure to give the ClipRRect widget enough border Radius 😉.
ClipRRect(
borderRadius: BorderRadius.circular(50),
child : Material(
child : InkWell(
child : Padding(
padding : const EdgeInsets.all(5),
child : Icon(
Icons.favorite_border,
),
),
onTap : () {},
),
),
)
Instead of removing a padding around an IconButton you could simply use an Icon and wrap it with a GestureDetector or InkWell as
GestureDetector(
ontap:(){}
child:Icon(...)
);
Incase you want the ripple/Ink splash effect as the IconButton provides on click wrap it with an InkWell
InkWell(
splashColor: Colors.red,
child:Icon(...)
ontap:(){}
)
though the Ink thrown on the Icon in second approach wont be so accurate as for the IconButton, you may need to do some custom implementation for that.
Here's a solution to get rid of any extra padding, using InkWell in place of IconButton:
Widget backButtonContainer = InkWell(
child: Container(
child: const Icon(
Icons.arrow_upward,
color: Colors.white,
size: 35.0,
),
),
onTap: () {
Navigator.of(_context).pop();
});
I was facing a similar issue trying to render an Icon at the location the user touches the screen. Unfortunately, the Icon class wraps your chosen icon in a SizedBox.
Reading a little of the Icon class source it turns out that each Icon can be treated as text:
Widget iconWidget = RichText(
overflow: TextOverflow.visible,
textDirection: textDirection,
text: TextSpan(
text: String.fromCharCode(icon.codePoint),
style: TextStyle(
inherit: false,
color: iconColor,
fontSize: iconSize,
fontFamily: icon.fontFamily,
package: icon.fontPackage,
),
),
);
So, for instance, if I want to render Icons.details to indicate where my user just pointed, without any margin, I can do something like this:
Widget _pointer = Text(
String.fromCharCode(Icons.details.codePoint),
style: TextStyle(
fontFamily: Icons.details.fontFamily,
package: Icons.details.fontPackage,
fontSize: 24.0,
color: Colors.black
),
);
Dart/Flutter source code is remarkably approachable, I highly recommend digging in a little!
A better solution is to use Transform.scale like this:
Transform.scale(
scale: 0.5, // set your value here
child: IconButton(icon: Icon(Icons.smartphone), onPressed: () {}),
)
You can use ListTile it gives you a default space between text and Icons that would fit your needs
ListTile(
leading: Icon(Icons.add), //Here Is The Icon You Want To Use
title: Text('GFG title',textScaleFactor: 1.5,), //Here Is The Text Also
trailing: Icon(Icons.done),
),
I like the following way:
InkWell(
borderRadius: BorderRadius.circular(50),
onTap: () {},
child: Container(
padding: const EdgeInsets.all(8),
child: const Icon(Icons.favorite, color: Colors.red),
),
),
enter image description here
To show splash effect (ripple), use InkResponse:
InkResponse(
Icon(Icons.volume_up),
onTap: ...,
)
If needed, change icons size or add padding:
InkResponse(
child: Padding(
padding: ...,
child: Icon(Icons.volume_up, size: ...),
),
onTap: ...,
)