Feature/customizable inkwell

[WieFel]

Makes the InkWell in BackdropNavigationBackLayer customizable:

• itemPadding: set padding for list items.
• itemCustomBorder: set custom border for items.
• itemSplashColor: set custom splash color.

Closes #59.

[daadu]

@WieFel Should we add customBorder as Shape around the item of the list as well?

[WieFel]

@daadu what do you mean exactly?
I think that is what itemCustomBorder already does...

[daadu]

Something like this. So that the itemCustomBorder is added to item itself along with InkWell, and we can rename itemCustomBorder to itemShape

[daadu]

Rest looks fine to me.

[WieFel]

There is one problem left:
When I use the following code:

        backLayer: BackdropNavigationBackLayer(
          items: [
            ListTile(title: Text("Widget 1")),
            ListTile(title: Text("Widget 2"), tileColor: Colors.orange,),
          ],
          onTap: (int position) => {setState(() => _currentIndex = position)},
          separatorBuilder: (context, index) => Divider(),
          itemCustomBorder:
          RoundedRectangleBorder(borderRadius: BorderRadius.circular(16)),
        ),

The border is not actually applied to the list item:

Adding clipBehavior: Clip.antiAlias to the Container solves the problem and borders are applied. The question now is if we want to hardcode clipBehavior or if we should expose it as property as well @daadu ?

[daadu]

Oops! @WieFel This is getting complicated. I would suggest going back to only modifying the customBorder of InkWell. Rename itemCustomBorder to itemSplashBorder.

@WieFel What do you think?

[daadu]

User can anyways modify item as he wants, the issue only was with InkWell.

[daadu]

I only suggested setting shape of item because the name (itemCustomBorder) suggested that this parameter is for item. A better name should be itemSplashBorder.

[WieFel]

@daadu ok no problem.
Reverted the commits. I'll modify the property name and then this is ready for merge...

[daadu]

LGTM

[daadu]

This feature has landed with v0.4.7 on pub.dev.