CODEWITHSUNDEEP
androidiosflutterdart
Simon B
Simon B

Reputation: 587

Focus the bottom of a ListView ? Flutter

If I add items dynamically to a listView with a listView.builder, how do I keep the bottom of the list focus ? Like if the list is full, and I add an Item, how do I do to make the other go up and focus the last item without deleting anything ?

Upvotes: 2

Views: 9198

Answers (4)

Anthony Aniobi
Anthony Aniobi

Reputation: 327

Efficient Solution:

This solution keeps the ListView focused at the bottom by default, and does not require any scroll controller. So you don't have to worry about where to initialze your scroll controller 😉.

int list_length; // length of your very long list
List long_list; // your long list of items

ListView.builder(
    reverse: true,
    shrinkWrap: true,
    itemCount: item_length,
    itemBuilder: (context, index)=>Text(
        '${long_list[list_length-index-1]}'
    ))
)

Happy Coding !!

Upvotes: 0

ParSa
ParSa

Reputation: 1426

These answers don't make your list Focused at the bottom by default, I used this trick hope it helps : first reverse the list you gave to the ListView.builder an then add this property to your ListView : reverse: true

Upvotes: 1

gsm
gsm

Reputation: 2426

The Accepted answer is correct but also this answer will be useful,

//Controller

ScrollController _scrollController = new ScrollController();

//Add this controller to list

ListView.builder(
      controller: _scrollController, //The Controller
      shrinkWrap: true,
      reverse: false,
      itemCount: snapshot.data.documents.length,
      itemBuilder: (context, index) {
      //Your Widgets
 })

// Add this to everytime you want to scroll to the bottm of list

_scrollController.animateTo(
        _scrollController.position.maxScrollExtent,
        curve: Curves.easeOut,
        duration: const Duration(milliseconds: 300),
);

Upvotes: 3

Dhaval Solanki
Dhaval Solanki

Reputation: 4705

Hi you can take help of ScrollController using method jumpTo() or animateTo() like bellow,

First create instance of 

ScrollController controller = new ScrollController();

Then after registering it with your listview like bellow example

ListView.builder(
              itemBuilder: (context, index) => ListTile(
                title: Text("Item List"),
              ),
              controller: controller,
              itemCount: 50,
            ),

And finally call jumTo() or animateTo() method when new item added or whenever you want to go at bottom like bellow 

controller.jumpTo(controller.position.maxScrollExtent);

Upvotes: 4

Related Questions