howl.ui.BufferPopup

(sizing)

fits a buffer filled after creating the popup once shown

buf = ActionBuffer!
popup = BufferPopup buf
buf\append 'a somewhat longer popup message'
popup\show widget, pointing_to: {x: 1, y: 1, height: 1}
assert.is_true popup.width >= width_of(popup, 'a somewhat longer popup message')
popup\release!

grows as the buffer changes while showing

buf = ActionBuffer!
buf\append 'short'
popup = BufferPopup buf
popup\show widget, pointing_to: {x: 1, y: 1, height: 1}
height = popup.height
buf\append '\na somewhat longer second line'
assert.is_true popup.width >= width_of(popup, 'a somewhat longer second line')
assert.is_true popup.height > height
popup\release!

resizes a centered popup as the buffer changes

buf = ActionBuffer!
buf\append 'short'
popup = BufferPopup buf
popup\show widget
buf\append ' and then some more'
assert.is_true popup.width >= width_of(popup, 'short and then some more')
popup\release!

follows the buffer when the buffer is switched

popup = BufferPopup ActionBuffer!
buf = ActionBuffer!
buf\append 'a somewhat longer popup message'
popup.buffer = buf
assert.is_true popup.width >= width_of(popup, 'a somewhat longer popup message')
popup\release!

(resource management)

popups are collected as they should

buf = ActionBuffer!
o = BufferPopup buf
list = setmetatable {o}, __mode: 'v'
o\release!
o = nil
collectgarbage!
assert.is_nil list[1]

stops listening to the buffer when released

buf = ActionBuffer!
popup = BufferPopup buf
listener = popup._listener
popup\release!
listeners = [l for l in *buf._buffer.listeners when l == listener]
assert.same {}, listeners