Flutter: disable sliverAppBar padding animation

Question

I want to attach custom menu bar (full width) to the sliverAppBar widget so that it will stick to the bottom of sliverAppBar background and will be always visible.

To solve this I've put Row widget into FlexibleSpaceBar.title parameter but now I have one unexpected problem.

When I wrap anything inside FlexibleSpaceBar.title parameter into a Row widget it starts to animate overflowed padding. Also it expands Row widget outside screen bounds. That was unexpected behavior.

I don't want to shrink title padding or resize title on SliverList scroll.

SliverAppBar(
  expandedHeight: 200.0,
  floating: false,
  pinned: true,
  elevation: 0.0,
  flexibleSpace: SafeArea(child: // <-- SafeArea doesn't work for FlexibleSpaceBar.title in this case
    FlexibleSpaceBar(
      background: Row(
        mainAxisAlignment: MainAxisAlignment.center,
        crossAxisAlignment: CrossAxisAlignment.start,
        children: [
          Image.asset(
            'assets/images/store.png',
            fit: BoxFit.cover,
            width: 120,
            height: 120,
          ),
        ],
      ),
      collapseMode: CollapseMode.none,
      titlePadding: EdgeInsetsDirectional.only(start: 100, bottom: 0), // <-- have to add 100 to padding to keep in safe area on the screen
      title: Row( // <-- animation enables by default if wrapped in a Row widget
        children: [
          Icon(Icons.menu, size: 40, color: Colors.white,),
        ]
      )
    )
  )
),

How to disable this shrink, size and animation in sliverAppBar for FlexibleSpaceBar title?

mr.incredible · Accepted Answer · 2019-10-15 15:56:27Z

1

I've just solved this problem by adding one more sliverAppBar instead of using FlexibleSpaceBar.title for this purpose.

SliverAppBar( // <-- just hiding logo
  expandedHeight: 200.0,
  floating: false,
  pinned: true,
  elevation: 0.0,
  flexibleSpace: SafeArea(child:
    FlexibleSpaceBar(
      background: Row(
        mainAxisAlignment: MainAxisAlignment.center,
        crossAxisAlignment: CrossAxisAlignment.start,
        children: [
          Image.asset(
            'assets/images/store.png',
            fit: BoxFit.cover,
            width: 120,
            height: 120,
          ),
        ],
      ),
    )
  )
),
SliverAppBar( // <-- custom sticky menu bar
  floating: false,
  pinned: true,
  elevation: 0.0,
  flexibleSpace: SafeArea(child:
    FlexibleSpaceBar(
      ...
    )
  )
),

answered Oct 15, 2019 at 15:56

mr.incredible

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