components_dialogs_JRListDialogRow.bs

import "pkg:/source/utils/dialogLayout.bs"
import "pkg:/source/utils/misc.bs"

' See JRListDialogRow.xml for why the check is a tinted Poster rather than a
' RadioButtonList.

' The gutter and padding live in dialogLayout.bs (LIST_ROW_CHECK_GUTTER /
' LIST_ROW_PADDING) so the spacing gate covers them.
'
' CHECK_ICON_SIZE stays HERE and stays off the 6px scale on purpose: it is the
' source bitmap's size, not a spacing choice. The $$RES$$ pipeline substitutes a
' 23x23 _hd asset decoded at physical output size, so 35 design units is 1:1 on
' both tiers; rounding it to 36 would break that and soften the glyph.
const CHECK_ICON_SIZE = 35

sub init()
  m.selectedBackground = m.top.findNode("selectedBackground")
  m.checkIcon = m.top.findNode("checkIcon")
  m.rowIcon = m.top.findNode("rowIcon")
  m.rowLabel = m.top.findNode("rowLabel")

  constants = m.global.constants

  ' The leading icon fills the gutter's slot. colorTextPrimary, not the check's
  ' colorSecondary: it labels the row, it does not mark a state.
  m.rowIcon.width = LIST_ROW_ICON_SIZE
  m.rowIcon.height = LIST_ROW_ICON_SIZE
  m.rowIcon.loadWidth = LIST_ROW_ICON_SIZE
  m.rowIcon.loadHeight = LIST_ROW_ICON_SIZE
  m.rowIcon.loadDisplayMode = "limitSize"
  m.rowIcon.blendColor = constants.colorTextPrimary
  m.selectedBackground.blendColor = constants.colorBackgroundSecondary
  ' Sized 1:1 with the source bitmap so it renders crisp at native resolution,
  ' the same way the app's other inline icons are declared.
  m.checkIcon.uri = constants.iconCheckWhite
  m.checkIcon.width = CHECK_ICON_SIZE
  m.checkIcon.height = CHECK_ICON_SIZE

  ' colorSecondary, not colorPrimary. The theme table reserves colorPrimary for
  ' things the user can focus or act on (it is the focus ring around this very
  ' row) and defines colorSecondary as non-focusable emphasis, which is exactly
  ' what "this is your current pick" is. JRDropdownItem marks its selected item
  ' the same way.
  m.checkIcon.blendColor = constants.colorSecondary
end sub

sub onItemContentChanged()
  content = m.top.itemContent
  if not isValid(content) then return

  m.rowLabel.text = content.title

  ' isSelected is added to the ContentNode by JRListDialog. Absent (a row built
  ' by anything else) reads as not selected rather than faulting.
  '
  ' Two signals for one state, covering each other's blind spot: the check is a
  ' SHAPE (survives any palette and colour-blindness), and the surface gives the
  ' row weight in a long single-colour list.
  isSelected = isValid(content.isSelected) and content.isSelected
  m.checkIcon.visible = isSelected
  m.selectedBackground.visible = isSelected

  ' One gutter, two possible occupants, and the check always wins. They cannot
  ' co-occur in practice (a picker marks a current option and carries no icons,
  ' an action list carries icons and marks nothing, selectedIndex = -1), but
  ' "cannot happen" is not a layout rule, so this states which one draws rather
  ' than letting two posters stack in the same 36px slot.
  iconUri = isValid(content.icon) ? content.icon : ""
  m.rowIcon.uri = iconUri
  m.rowIcon.visible = iconUri <> "" and not isSelected

  ' The LABEL stays colorTextPrimary either way. Recolouring it to match the
  ' check was tried and read as too much contrast on device once the surface
  ' landed: three simultaneous treatments on one row is louder than the state
  ' warrants, and the row's job is to be readable first.
  '
  ' The accessibility argument that motivated the hue is carried by the CHECK,
  ' which is a SHAPE: it survives color-blindness and a dim or badly
  ' calibrated panel, which is more than a hue swap ever did. The surface adds
  ' weight for everyone else.

  layoutRow()
end sub

sub onSizeChanged()
  layoutRow()
end sub

sub layoutRow()
  rowWidth = m.top.width
  rowHeight = m.top.height
  if rowWidth <= 0 or rowHeight <= 0 then return

  m.selectedBackground.width = rowWidth
  m.selectedBackground.height = rowHeight

  m.checkIcon.translation = [LIST_ROW_PADDING, int((rowHeight - CHECK_ICON_SIZE) / 2)]
  m.rowIcon.translation = [LIST_ROW_PADDING, int((rowHeight - LIST_ROW_ICON_SIZE) / 2)]

  m.rowLabel.translation = [LIST_ROW_CHECK_GUTTER, 0]
  m.rowLabel.width = rowWidth - LIST_ROW_CHECK_GUTTER - LIST_ROW_PADDING
  m.rowLabel.height = rowHeight
end sub