I'd like to use slidable_button found here to set a bar happy hour on or off in my app. It doesn't have an initial position so I need to use two buttons, one to set happy hour on and another to turn it off. Ideally I'd like to have it initialize in either the left position or the right position depending on the current state. Unfortunately the package is very new and the author is not contactable.
Is there a way I could modify this code to set an initial button position left or right?
Here is the code I have so far. I have two buttons in separate rows in a column but have only shown the code for one as they are similar.
Center(
child: SlidableButton(
width: MediaQuery.of(context).size.width / 3,
buttonWidth: 60.0,
color: Colors.green,
buttonColor: Colors.blue,
dismissible: true,
label: Center(child: Text(_user.turnOnString!)),
child: Padding(
padding: const EdgeInsets.all(8.0),
child: Row(
mainAxisAlignment: MainAxisAlignment.spaceBetween,
children: [
Text(''),
Text('Start'),
],
),
),
onChanged: (position) {
if (position == SlidableButtonPosition.right) {_startHappyHour(context, _user);}
},
),
),
switch button would be more suitable for your situation, like lite_rolling_switch, you can set initial value(on/off):
LiteRollingSwitch(
//initial value
value: true,
textOn: 'disponible',
textOff: 'ocupado',
colorOn: Colors.greenAccent[700],
colorOff: Colors.redAccent[700],
iconOn: Icons.done,
iconOff: Icons.remove_circle_outline,
textSize: 16.0,
onChanged: (bool state) {
//Use it to manage the different states
print('Current State of SWITCH IS: $state');
},
),
Related
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.
This might be just a simple problem but I can't figure it out somehow right now. I am using the Flutter xslider https://pub.dev/packages/flutter_xlider vertically with values from 0 to 90. When I am dragging the slider it repaints a line depending on the value of the slider and simultaneously it changes the numeric value in a TextField. This once worked but after adding the TextField and updating all the components (Flutter. Dart. Packages. AndroidStudio) I have the following problem:
because of the line setState(() { }); in onDragging the value of the slider always remains 0 and snaps back after the dragging is finished. if I leave out the setState method the slider works however my line gets of course not painted. what am I doing wrong? does it has something to do with the surrounding components while building? or is there another reason?
UPDATE: i found the solution. I now update the values property by myself such as values: [sliderValue] whereas sliderValue is a double initialized once and then updated within the onDragging. its strange that this is never suggested inside the documentation
body: Column(
children: [
new Padding(
padding: new EdgeInsets.all(15.0),
),
angleTextQuestion,
new Padding(
child: Column(children:[ TextField( controller: txtAngleC,
keyboardType: TextInputType.number,
onChanged: (text) {
double angle = double.parse(text);
if(angle >= 0 && angle <= 90) {
_angleAirplane = double.parse(text);
setState(() {});
}
},),
Text("(type in a value between 0 - 90)")
]),
padding: new EdgeInsets.all(15.0),
),
Expanded( child: new Row( children: [
new Padding(
padding: new EdgeInsets.all(20.0),
),
Expanded( child: new SizedBox(
height: 250,
width: 50,
child: FlutterSlider(
values: [0],
rangeSlider: false,
max: 90,
min: 0,
rtl: true,
step: FlutterSliderStep(step: 1.0),
axis: Axis.vertical,
tooltip: FlutterSliderTooltip(
textStyle: TextStyle(fontSize: 14, color: Colors.lightBlue),
),
onDragging: (handlerIndex, lowerValue, upperValue) {
_angleAirplane = lowerValue;
txtAngleC.text = _angleAirplane.toString();
setState(() { });
},
))),
Text(_angleAirplane.toString()),
new Padding(
padding: new EdgeInsets.all(10.0),
),
Expanded( child: new CustomPaint(
foregroundPainter: new AnglePainter(
angle: _angleAirplane
)))
]
)),
]
),
```
change values:[0] to this
values: [_angleAirplane]
this happens because there is a setState inside your onDragging method and redraw the slider with 0 value.
We have a list with 20+ elements that we have to show in a dropdown. The problem is that when we deploy the dropdown, the list covers all the screen. We want to reduce the number of shown elements to about 5 or 6 and be able to scroll down the rest of the list.
We would also like to know if it's possible that the dropDownMenuItems deploy under the dropDownButton.
We have tryed doing ".toList().sublist(0,5)," but this way didn´t allow us to scroll.
Widget _dropdown() {
return new Container(
width: MediaQuery.of(context).size.width * 35 / 100,
height: MediaQuery.of(context).size.height * 6 / 100,
decoration: BoxDecoration(
backgroundBlendMode: BlendMode.darken,
),
child: Theme(
child: DropdownButtonHideUnderline(
child: ButtonTheme(
alignedDropdown: true,
child: new DropdownButton(
hint: Text(
'HINT TEXT',
),
value: selected_item,
onChanged: (newValue) {
setState(
() {
selected_item = newValue;
},
);
},
isDense: false,
isExpanded: true,
items: data.map((location) {
return new DropdownMenuItem<String>(
child: new Container(
child: Align(
alignment: Alignment.centerLeft,
child: new Text(
location.toUpperCase(),
),
),
),
value: location,
);
}).toList(),
),
),
),
),
);
}
Look into this custom DropDown Button. It is the normal Dropdown Button with the possibility to give height to the widget. If you set height = 5* 48.0 (which is the _menuItemHeight) you should only see 5 elements.
I am a beginner in Flutter and I can not get the result I want because I have a "layout problem". I tried several things for hours...
Technical problem:
When I click on "add player button" to add a new TextField to set more play name, I have an error: "BoxConstraints forces an infinite width". So, the TextField isn't displayed.
Other features that I do not know how to realize:
- I have a "dropdownmenu' to choose difficulty game. Why the default text isn't displayed (Difficulty: normal)?
- How to do this: When the user clicks on the icon "remove" (see suffixIcon on TextField), then the corresponding fieldText is deleted?
- How to do this: When user click to add player the default HintText is incremented (Player 2, Player 3, Player 4, ....)?
- Why my background gradient doesn't fix when user scroll page? (like in HTML/CSS 'background-attachment: fixed') ?
import 'package:flutter/material.dart';
/// Styles
///
class Homepage extends StatefulWidget {
#override
State<StatefulWidget> createState() {
return _MyHomePageState();
}
}
class _MyHomePageState extends State<Homepage> {
String dropdownValue = 'Normal';
List<TextField> _playerList = new List(); //_playerList is my List name
int playerListIndex = 0; //Count the number of times "Add" button clicked
#override
Widget build(BuildContext context) {
return Scaffold(
body: Stack(children: <Widget>[
// To have a gradient background
new Container(
height: MediaQuery.of(context).size.height,
width: MediaQuery.of(context).size.width,
decoration: new BoxDecoration(
gradient: new LinearGradient(
begin: Alignment.topCenter,
end: Alignment.bottomCenter,
stops: [0.1, 1],
colors: [
Colors.redAccent[200],
Colors.red[300],
],
tileMode:
TileMode.repeated,
),
),
//I need SingleChildScrollView to haven't "Overflow yellow bar on bottom screen"
child: SingleChildScrollView(
child: Container(
padding: EdgeInsets.fromLTRB(20, 0, 20, 0),
child: Center(
child: Column(
mainAxisAlignment: MainAxisAlignment.spaceEvenly,
mainAxisSize: MainAxisSize.min,
children: <Widget>[
// Box to add big image
SizedBox(
height: 450,
),
// DROP DOWN MENU to choose difficulty modes
InputDecorator(
decoration: InputDecoration(
prefixIcon: const Icon(Icons.games),
filled: true,
),
child: DropdownButtonHideUnderline(
child: new DropdownButton<String>(
value: dropdownValue,
hint: Text('Difficulty normal'),
isDense: true,
items: <String>['Normal', 'Easy', 'Hard']
.map<DropdownMenuItem<String>>((String value) {
return DropdownMenuItem<String>(
value: value,
child: Text(value),
);
}).toList(),
onChanged: (String newValue) {
setState(() {
dropdownValue = newValue;
});
},
),
),
),
//Field player name 1. At least I need 1 player
new TextField(
maxLength: 20,
decoration: InputDecoration(
prefixIcon: const Icon(Icons.person),
filled: true,
hintText:"Player 1",
counterText: "",
),
),
//Field for other player name 2, 3, 4, ...
new ListView.builder(
padding: EdgeInsets.all(0),
shrinkWrap: true,
physics: NeverScrollableScrollPhysics(),
itemCount: _playerList.length,
itemBuilder: (context, index) {
TextField widget = _playerList.elementAt(index);
return widget;
}),
//Button to add other field text to set player name. The user can delete a player on click on "clear icon button"
new Align(
alignment: Alignment.centerRight,
child: FlatButton.icon(
color: Colors.black,
icon: Icon(
Icons.add,
color: Colors.white,
size: 18,
),
label: Text('Add player',
style:
TextStyle(fontSize: 12, color: Colors.white)),
onPressed: () {
setState(() {
playerListIndex++;
_playerList.add(
new TextField(
maxLength: 20,
decoration: InputDecoration(
prefixIcon: const Icon(Icons.person),
suffixIcon: new IconButton(
icon: Icon(Icons.clear),
onPressed: () {
_playerList.removeAt(playerListIndex); //Doesn't work
}),
filled: true,
hintText: "Player $playerListIndex", //Doesn't work i would like Player 2, Player 3, ...
counterText: "",
),
),
);
print(playerListIndex);
print(_playerList);
print(_playerList[0]);
});
}),
),
new ButtonTheme(
minWidth: 350,
height: 45,
child: FlatButton(
color: Colors.black,
child: Text('Play',
style:
TextStyle(fontSize: 18, color: Colors.white)),
onPressed: () {
// Perform some action
},
),
),
],
),
),
),
),
),
]),
);
}
}
I think that I understood what's going on. Let's begin:
First. Your TextField is not showing up and you're getting an error because you didn't set a width and a height for it, so, it's trying to get the maximum size as it can get. Solution for this? Wrap it in a Container widget (or SizedBox) and give it a width and a height. That should fix the first problem.
Second. Your DropDownMenu's hint text (Difficulty Normal) is not showing because you're not passing the parameter "hint" in the DropDown widget, See the hint propierty below.
Third. You want to clear the TextField string when click on a suffix, right? To achieve this, pass a GestureDetector or an IconButton as your suffix component, create a TextEditingController and pass it in the TextField, in the controller section, then, on the onPressed/onTap method (depending on which Widget you'll set) set this: _textController.text.clear() method, inside the setState function. This should fix the problem.
Forth. You want the list of player's string to increase as you add more players right? You have many ways to achieve this, one of them is creating an empty list, you can mock to test it, and then, everytime you click the "Add player" button, you'll add a String corresponding to the value inside a for loop passing the for's index as int value in the "Player $index". Again, the for method will receive a setState method, and inside the setState, your logic to add one more Player.
And finally, your gradient does not keep fixed? Hmm, I think you can pass a proprierty in the Scaffold widget called resizeToAvoidBottomInset and set it to false.
If something did not work as you expected, reply it and I'll help you out.
I was trying to clone WhatsApp(iOS version) with flutter using Cupertino Widgets.
while trying to make the header with CupertinoSliverNavigationBar i noticed that the height of CupertinoSliverNavigationBar cannot be increased.
My Code
return CupertinoPageScaffold(
child: NotificationListener<ScrollNotification>(
onNotification: (scrollNotification) {
if (scrollNotification is ScrollStartNotification) {
_onStartScroll(scrollNotification.metrics);
} else if (scrollNotification is ScrollUpdateNotification) {
_onUpdateScroll(scrollNotification.metrics);
} else if (scrollNotification is ScrollEndNotification) {
_onEndScroll(scrollNotification.metrics);
}
},
child: CustomScrollView(
slivers: <Widget>[
CupertinoSliverNavigationBar(
leading: GestureDetector(
child: Padding(
padding: EdgeInsets.only(top: 10.0),
child: Text(
"Edit",
style: TextStyle(
color: Constants.primaryColor,
fontSize: 18.0,
),
),
),
onTap: ()=>print("Tapped"),
),
trailing: GestureDetector(
child: Icon(
CupertinoIcons.create_solid,
size: 25.0,
),
onTap: ()=>print("Tapped"),
),
automaticallyImplyLeading: false,
largeTitle: Column(
children: <Widget>[
Container(
child: Text(
"Chats",
textAlign: TextAlign.left,
),
),
GestureDetector(
child: SearchBar(),
),
],
),
),
],
),
),
);
Screenshots below:
What i want to achieve
What i got
Is there any work around or anyway to increase the height? Thanks!
Flutter purists and advocates will kill me, but those sizes are part of the constants values (like MaterialDesign guidelines values), 2 quick options:
Option 1:
Modify the SDK directly:
Ctrl (or Cmd) + click in CustomScrollView, will open flutter/lib/src/cupertino/nav_bar.dart
Modify line 22 or 26:
/// This height is constant and independent of accessibility as it is in iOS.
const double _kNavBarPersistentHeight = 44.0;
/// Size increase from expanding the navigation bar into an iOS-11-style large title
/// form in a [CustomScrollView].
const double _kNavBarLargeTitleHeightExtension = 52.0; // change this one!
Option 2:
copy nav_bar.dart directly in your project, and modify it, or better yet, grab all the dependencies of CustomScrollView(), and put ur own name, and ur own values there... I guess that beyond being a standard design guideline from Apple, the ability to change those values are required for several devs. We should open a Github request maybe.
Hope you find my "hacky" solution useful!
Result:
You don't need to modify the SDK or something like that.
I have found a simple solution.
add this to CustomScrollView, adjust the anchor until you get a good UI.
CustomScrollView(
anchor: 0.07,
See the image here