如何检测 TabBarView 刚刚被拖动？

Question

The TabBar widget has an onTap() callback that allows to detect when the user has just pressed a tab. This is useful so that we we can prepare the new tabView to show some dynamic data.

The TabBar widget has also a drag functionality that allows to change the tabView displayed ( similar result as tapping on another tab). But in this case there seems to be no way to prepare the new TabView because there's no an onDrag() callback.

So the question is : is there a way to detect that a TabBarView has just been dragged?

Answer 1

The TabBar widget has an onTap() callback that allows to detect when the user has just pressed a tab. This is useful so that we we can prepare the new tabView to show some dynamic data.

The TabBar widget has also a drag functionality that allows to change the tabView displayed ( similar result as tapping on another tab). But in this case there seems to be no way to prepare the new TabView because there's no an onDrag() callback.

So the question is : is there a way to detect that a TabBarView has just been dragged?

Answer 2

The TabBar widget has an onTap() callback that allows to detect when the user has just pressed a tab. This is useful so that we we can prepare the new tabView to show some dynamic data.

The TabBar widget has also a drag functionality that allows to change the tabView displayed ( similar result as tapping on another tab). But in this case there seems to be no way to prepare the new TabView because there's no an onDrag() callback.

So the question is : is there a way to detect that a TabBarView has just been dragged?

Answer 3

The TabBar widget has an onTap() callback that allows to detect when the user has just pressed a tab. This is useful so that we we can prepare the new tabView to show some dynamic data.

The TabBar widget has also a drag functionality that allows to change the tabView displayed ( similar result as tapping on another tab). But in this case there seems to be no way to prepare the new TabView because there's no an onDrag() callback.

So the question is : is there a way to detect that a TabBarView has just been dragged?

Answer 4

The TabBar widget has an onTap() callback that allows to detect when the user has just pressed a tab. This is useful so that we we can prepare the new tabView to show some dynamic data.

The TabBar widget has also a drag functionality that allows to change the tabView displayed ( similar result as tapping on another tab). But in this case there seems to be no way to prepare the new TabView because there's no an onDrag() callback.

So the question is : is there a way to detect that a TabBarView has just been dragged?

Answer 5

The TabBar widget has an onTap() callback that allows to detect when the user has just pressed a tab. This is useful so that we we can prepare the new tabView to show some dynamic data.

The TabBar widget has also a drag functionality that allows to change the tabView displayed ( similar result as tapping on another tab). But in this case there seems to be no way to prepare the new TabView because there's no an onDrag() callback.

So the question is : is there a way to detect that a TabBarView has just been dragged?

Answer 6

This works for me:

int _tab = 0;

@override
void initState() {
 super.initState();

 _tabController = TabController(
  length: _tabs.length, 
  vsync: this
 );

 _tabController.animation!.addListener(_tabListener);
}

void _tabListener(){
 if(_tab != _tabController.animation!.value.round()){
  setState(() {
   _tab = _tabController.animation!.value.round();
  });
 }
}