Add two-way databinding for lua, and flesh out the lua statusbar

1 files changed, 37 insertions, 0 deletions

diff --git a/lua/backstack.lua b/lua/backstack.lua
new file mode 100644
index 00000000..c54fbac4
--- /dev/null
+++ b/lua/backstack.lua
@@ -0,0 +1,37 @@
+local lvgl = require("lvgl")
+
+local backstack = {
+  root = lvgl.Object(nil, {
+    w = lvgl.HOR_RES(),
+    h = lvgl.VER_RES(),
+  }),
+  stack = {},
+}
+
+function backstack:Top()
+  return self.stack[#self.stack]
+end
+
+function backstack:SetTopParent(parent)
+  local top = self:Top()
+  if top and top.root then
+    top.root:set_parent(parent)
+  end
+end
+
+function backstack:Push(screen)
+  self:SetTopParent(nil)
+  table.insert(self.stack, screen)
+  self:SetTopParent(self.root)
+end
+
+function backstack:Pop(num)
+  num = num or 1
+  for _ = 1, num do
+    local removed = table.remove(self.stack)
+    removed.root:delete()
+  end
+  self:SetTopParent(self.root)
+end
+
+return backstack