Left Aligned ViewPort in Page View

How it works

PageView widget looks cool but when we set viewportFraction, the view gets center aligned.

If viewportFraction sets

PageView(
   viewportFraction: 0.8
)

Center-Aligned view port

How I expect

But what I need is the view to start with left-aligned like how playstore dashboard works.

There should be some gravity attribute and based on the value,
the view has to start with the respective position.

Left-Aligned view port
The above screenshot has taken from the Google Play Store.

I've also posted a query in StackOverflow
https://stackoverflow.com/questions/60547319/flutter-how-to-left-align-view-port-in-pageview

@vivekkannavenus

Hi @vivekkannavenus
Among similar I found only this https://stackoverflow.com/questions/56871898/align-a-flutter-pageview-to-the-screen-left
There is gist in the solution, where I can change align by editing value in the line final portion = (position.extentInside - itemDimension) / 2;
But this is another case, not about PageController with viewportFraction

@VladyslavBondarenko

@VladyslavBondarenko Thanks for referring the mere same stuff.
It works but has some stability issues like this code doesn't work effectively when page view items dynamically change.

It is helpful to add this feature.

@VladyslavBondarenko

Hi @VladyslavBondarenko , I want to create PR for this issue. I check out the source code and I saw there is a SliverFillViewport widget that maybe we can wrap it with align. do you have any idea about how can I solve this?

@override
  Widget build(BuildContext context) {
    final AxisDirection axisDirection = _getDirection(context);
    final ScrollPhysics physics = _ForceImplicitScrollPhysics(
      allowImplicitScrolling: widget.allowImplicitScrolling,
    ).applyTo(widget.pageSnapping
        ? _kPagePhysics.applyTo(widget.physics)
        : widget.physics);

    return NotificationListener<ScrollNotification>(
      onNotification: (ScrollNotification notification) {
        if (notification.depth == 0 && widget.onPageChanged != null && notification is ScrollUpdateNotification) {
          final PageMetrics metrics = notification.metrics as PageMetrics;
          final int currentPage = metrics.page.round();
          if (currentPage != _lastReportedPage) {
            _lastReportedPage = currentPage;
            widget.onPageChanged(currentPage);
          }
        }
        return false;
      },
      child: Scrollable(
        dragStartBehavior: widget.dragStartBehavior,
        axisDirection: axisDirection,
        controller: widget.controller,
        physics: physics,
        viewportBuilder: (BuildContext context, ViewportOffset position) {
          return Viewport(
            // TODO(dnfield): we should provide a way to set cacheExtent
            // independent of implicit scrolling:
            // https://github.com/flutter/flutter/issues/45632
            cacheExtent: widget.allowImplicitScrolling ? 1.0 : 0.0,
            cacheExtentStyle: CacheExtentStyle.viewport,
            axisDirection: axisDirection,
            offset: position,
            slivers: <Widget>[
              SliverFillViewport(
                viewportFraction: widget.controller.viewportFraction,
                delegate: widget.childrenDelegate,
              ),
            ],
          );
        },
      ),
    );
  }```

Any update on this?

Would love to see this addressed.

I have a solution for this... Would be happy to share... PR

@PaulVinSoft249

I have a solution for this... Would be happy to share... PR

@PaulVinSoft249 Can you share the solution for alignin pageview to the left side?

@Dariel11

@Dariel11
Yes bro,
I will be writing a PR on this. But anyway I can share it.

https://gist.github.com/hello-paulvin/0aa8b6389e3aeb345fa1f3f246d9ab69#file-gistfile1-txt

You can open that and check it out :)

https://gist.github.com/hello-paulvin/0aa8b6389e3aeb345fa1f3f246d9ab69#file-gistfile1-txt

You can open that and check it out :)

Is there option to align to the left last item same as previous?

I've run into this issue when trying to implement a dynamically-sized TabController and TabBarView interface. In other words, an app organised into different tabs, where the user can add and remove tabs at runtime.

Most StackOverflow answers say to use PageController and PageView instead. But in order to implement a TabBar equivalent, you need to use another PageView synchronised with the main content PageView. The viewportFraction then needs to be less than 1.0 to see multiple tabs on the same page. If the PageView cannot be left-aligned, implementing this becomes significantly more difficult.

Any update on this?

padEnds还不能用啊

padEnds on which widget ? I don't see that option on page view.

This thread has been automatically locked since there has not been any recent activity after it was closed. If you are still experiencing a similar issue, please open a new bug, including the output of flutter doctor -v and a minimal reproduction of the issue.

Navigation Menu

Repository navigation

Left Aligned ViewPort in Page View #52014

How it works

How I expect

Metadata

Assignees

Labels

Type

Projects

Milestone

Relationships

Development

Left Aligned ViewPort in Page View #52014

Description

How it works

How I expect

Activity

VladyslavBondarenko commented on Mar 5, 2020

vivekkannavenus commented on Mar 5, 2020

yousifk commented on May 31, 2020

payam-zahedi commented on Aug 8, 2020

spareblock commented on Aug 29, 2020

ScottMacDougall commented on Oct 3, 2020

PaulVinSoft249 commented on Oct 5, 2020

PaulVinSoft249 commented on Oct 9, 2020

Dariel-G commented on Oct 27, 2020

edemekong commented on Oct 30, 2020

edemekong commented on Oct 30, 2020

divid3d commented on Dec 16, 2020

harrisonturton commented on Mar 11, 2021

uzuki-P commented on May 2, 2021

daixianceng commented on May 11, 2021

srikanth-vm commented on Jun 3, 2021

github-actions commented on Jul 31, 2021

Metadata

Metadata

Assignees

Labels

Type

Projects

Milestone

Relationships

Development

Issue actions