I am new to flutter and curious if we can create a custom back press button, not the one in appbar.
Just like a normal button that takes back to previous screen.
Here's how you so that:
Create a raw material button
Add the on press method to decide which screen it goes to.
In you main.dart, under the routes method, import the screen you want to push the current screen back to and then call it something.
Inside your onPress() method, you can call Navigator.pushNamed(context, routeName).
Now you can customise this raw material button as much as you want. Here are some of the main properties you can set:
textStyle
fillColor
elevation
padding
constraints
shape
child
Now give a name to this custom button you have created by extracting it into a widget.
Call the widget inside your code! If you want it to be aligned at the top left, which is usually where you find it:
Align(
alignment: Alignment.topLeft,
child: CustomButton()
),
Enjoy! PS: If you need any help, feel free to ask me and I will assist you to my best abilities!
Related
I am trying to implement a feature in Flutter in which user will be able to display additional information after clicking on the specific icon or image. I would like to display a small annotation above selected icon. The example of what i would like to achive is in the screen below.
Is there any ready to use widget for this feature?
you can use Tooltip widget for this as bellow
Tooltip(
message: "This is the tool tip",
child: Icon(Icons.add),
),
when you long press on the icon the message will be shown like this.
You can do this by using Stack. Place the Button first where you want the Stack to be.
You can write the information you want to put on top of the button in Positioned() inside the Stack.
Set a variable, show information when this variable is True otherwise hide it.
You can also use GestureDedector if you want it to close when you touch anywhere.
Im working on my first flutter app so i am still learning possible widgets and how they react in certain structures.
So far I was doing well but cant figure out one thing I want to do.
I want to get a floating button inside of my cupertinopopusurface widget like this.
My structure is similar, on the home screen I have a listview builder that builds my cards and when you press on each one it opens a cupertinopopupsurface.
Inside I also built a Single child scroll view structure for all my contant and its scrollable but I would to get a button that overlays it all and is in a fixed placed.
My structure currently is
CupertinoPopupSurface/
Container/
SingleChildScrollView/
Column/
Children/
Row/ (all rows now with content)
I cant get the button fixed somewhere in the structure but then it follows the scrolling its now fixed overlaying the contant.
You can use stack widget inside cupertinopopupsurface like this:
CupertinoPopupSurface(
child: Stack(
children:[
your SingleChildScrollView,
Positioned(left: 16, right: 16, bottom: 16,child: yourbutton),
]
)
)
When I tap on a item on tab bar a circle will appear and disappear, please tell me name of this animation and how could I implement it in a flutter
click for seeing sample
The effect is called a ripple. And you can get it by wrapping a widget in an Inkwell.
See more here about it here: https://docs.flutter.dev/cookbook/gestures/ripples
Hi In Scaffold BottomNavigationBar() has inbuilt properties of circle appear and disappear
You can use a widget called Gesture Detector which also has ripple effect
I want to show my own page on dropdown button tap, then item selected on page should be set as dropdown button value.
So basically, I need DropdownButton without any popup on tap. When I use onTap still default popup will be shown, how to prevent that?
why you don't use a button instead? or you can try to create an Inkwell put a container on its child and make it look like a button and write your code inside Inkwell OnTap(){}
1- Pass null to items parameter to disable the button.
2- You'll notice icon's color will be grey with disabled button, you can change it by setting color of the icon you send to icon parameter or send color directly to iconDisabledColor parameter.
3- You'll not use value parameter, instead you'll just use hint to show both your hint and your value. and update it using your state management after you pick new value from your own page.
4- Wrap your DropdownButton with GestureDetector or InkWell to show your own page when you tap on the button.
5- If you want to customize your DropdownButton shape, size and more. You can try my new package DropdownButton2. It's simple, easy, based on Flutter's core DropdownButton and have lots of features.
I'm asking how to disable Overlays to move when a Scaffold.of(context).showSnackBar is called like on my video below.
The same thing is happening when the keyboard appear. Sometime the blue floattingButton (+) don't come back to it's original position :-(
Thx in advance.
Problem animation
The FloatingActionButton going up when the Scaffold is displayed is something common to all default implementations.
Give a look to the "Bootom app bar" demo in the Gallery app. Press on the search button and you will see it coming up. Or just add a Scaffold to the app that is built with flutter create command.
This happens because of the way the FAB button is placed on the screen and the effect of displaying the Snackbar by the Scaffold.
The FAB button is displayed at the bottom of the content area of the Scaffold content. When the content area is shrinked to include the BottomAppBar, the FAB goes up with it. It has nothing to do with Overlay.
You have two options:
Either you create your own versión of the FAB which is not
controlled by the Scaffold.
Or you hack the Scaffold so the size of the SnackBar is not taken
into account.
For this second option you can try the following:
Go to the file /lib/src/material/scaffold.dart in your flutter installation and look for the line with the code snackBarSize: snackBarSize, inside the _ScaffoldLayout class.
Replace it with snackBarSize: Size(0.0, 0.0),
You will see that the FAB stays in its place.