Suggestion - Extend ISwipeable

[MFlisar]

About this issue

I want to distinguish between items the do allow swipe left / swipe right / both. Currently I can only distinguish can swipe / can not swipe.

My suggestion is to extend the ISwipeable interface:

interface ISwipeable {
    /** @return true if swipeable */
    val isSwipeable: Boolean

    /** @return true if the provided direction is supported */
    fun isDirectionSupported(direction: Int) : Boolean = true
}

What do you think about this? It's a very small and backwards compatible change with the default implementation inside the interface. isDirectionSupported will only be called if isSwipeable return true.

Details

•  Used library version: 5.4.1
•  Used support library version: androidx

[mikepenz]

@MFlisar being able to identify the swipeable direction makes sense.

How would the real implementation for isDirectionSupported look like?
Would a different interface not also fullfil this requirement? (As the implementation itself would also fall in the target apps responsibility it looks like?)

[MFlisar]

How would the real implementation for isDirectionSupported look like?

I do have items that do support "starting" them and sections, that do not support this. But both items do support delete. so I would use it like following:

In my case like following:

class ItemSection(val data: Data) : IItem, ISwipeable  {

	val isSwipeable: Boolean = true
	
	fun isDirectionSupported(direction: Int) : Boolean {
		return direction = ItemTouchHelper.RIGHT; // only right swipe is supported, sections can only be deleted and can't be started
	}
	
}

class Item(val data: Data) : IItem, ISwipeable  {
	
	val isSwipeable: Boolean = true
	
	fun isDirectionSupported(direction: Int) : Boolean {
		return true; // items can be started and deleted, so both swipe directions are supported
	}
	
}

Would a different interface not also fullfil this requirement?

Sure, but personally I think an interface with default implementation is more discoverable (especially if the features are so closely)

[MFlisar]

By the way, if backwards compatibility is not required, I would even replace the interface with following for the sake of simplicity:

interface ISwipeable {
    fun isSwipeable(direction: Int) : Boolean
}

Migration guide would simply look like following:

Replace

  override val isSwipeable = true|false

With

 override fun isSwipeable(direction: Int) = true|false

[mikepenz]

I'd opt for the backwards compatible form. Looked over it, and your proposal makes sense.
It will also need to be integrated SimpleSwipeDrawerCallback and SimpleSwipeCallback

Would you like to open a PR for this?

[MFlisar]

Would you like to open a PR for this?

Done

[mikepenz]

Thank you so much. Will be in the next update