[Feature request] newFirst for notification popups?

[SergeyKasmy]

The notification center itself is already able to show the newest notifications on the top, top to bottom. It would be awesome if the popups themselves also had a similar setting, so that the oldest popups where at the bottom and disappeared first, i.e. bottom to top

Example from Plasma

[MyriaCore]

Did a bit of recon to figure out a bit about how things are done currently.

Screen offsets for new notifications are calculated here. The vertical position is calculated here, by adding up the heights of the notifications that are currently being displayed, which is why new notifications appear at the bottom of the stack. This sum is used here to set the position of the new notification, and also here, to be stored and used to sum up for the next notification that appears.

[MyriaCore]

To implement newFirst for popups, there are a few changes we'd have to make, but they all fall into two categories: Insertion and deletion:

On Insertion:

• The vertical position for new notifs should always be the (fromIntegral distanceTop) + screenY

• The vertical position for all existing notifs should be 'pushed down' by adding height + distanceBetween to them. If we're willing to do a refactor for notification popups, and replace dNotiTop with dPos :: Int32 * Int32 (length by height), you could do something like the following:

  updatePos 
  :: MonadIO m 
  => DisplayingNotificationPopup   -- ^ notification to update
  -> (Int32 -> Int32)              -- ^ update function for horizontal position
  -> (Int32 -> Int32)              -- ^ update function for vertical position
  -> m DisplayingNotificationPopup -- ^ updated notification
  updatePos noti f g = do
    let (posX, posY) = update $ dPos noti
      where update (x, y) = (f x, g y)
    windowMove (dMainWindow noti) posX posY
    return noti { _dPos = (posX, posY) }
  
  -- To move a notif 3 pixels down:
  updatePos notif id (+3)

On Deletion:

• When a notif is deleted, all the notifs below it should have their vertical position updated: \

  let deletedHeight = snd $ dPos deletedNotif
      notisBelow = filter (\n -> (snd $ dPos n) > deletedHeight) dispNotis
      pushDown noti = updatePos noti id (+ deletedHeight)
  in mapM pushDown notisBelow