Add option to StretchingSheetPhysics to limit stretchable direction

[fujidaiti]

Hi @habibasseiss,

When the screen gets pulled up, I don't think it's a matter of giving the background a color, instead the physics could "attach" to the bottom to prevent showing the parent screen.

Thanks for the suggestion! I agree with this idea and so I will add an option to StretchingSheetPhysics to limit the directions in which the sheet can stretch.

// Does not work in the current version
DraggableSheet(
  physics: StretchingSheetPhysics(
  // This disables the stretching effect when overdragging upward
    direction: StretchingBehaviorDIrection.downward,
  ),
);

Originally posted by @fujidaiti in #157 (comment)

[appinteractive]

Is there also a way to specify the max stretch distance?

[mark8044]

Would it be a hard stop when pulling up, or still give a Bouncing effect?

[habibasseiss]

I'd love to have max stretch like @appinteractive suggested. In the native sheet, the stretch stops at the reduced parent page limits.

Here's the behavior of a basic sheet in SwiftUI:

swiftui-sheet.mp4

Source code: https://gist.github.com/habibasseiss/d14c375c40b6a543a8043d2aedc00c36

Having that in addition to the sheet attaching the bottom would be amazing!

[fujidaiti]

@appinteractive

Is there also a way to specify the max stretch distance?

StretchingSheetPhysics.stretchingRange could be used for this purpose. It determines how many pixels the sheet can be overdragged. (Sorry for the lack of documentation, I'll try to get it done before the first stable release.)

// Overdragging is disabled.
StretchingSheetPhysics(stretchingRange: const Extent.pixels(0));

// The sheet can be overdragged by ±100 pixels.
StretchingSheetPhysics(stretchingRange: const Extent.pixels(100));

// The sheet can be overdragged by ±10% of the sheet height.
StretchingSheetPhysics(stretchingRange: const Extent.proportional(0.1));

I think it would be nice to allow this property to be set for each direction.

[appinteractive]

I think it would be nice to allow this property to be set for each direction.

That's a great idea!

[fujidaiti]

I'd love to have max stretch like @appinteractive suggested. In the native sheet, the stretch stops at the reduced parent page limits. ... Having that in addition to the sheet attaching the bottom would be amazing!

I think another effort is needed to achieve this behavior...
I have created an issue (#169) to track this topic, so please follow up if interested.