From 55a760672223a26e6ba3be5523246fbac795bb11 Mon Sep 17 00:00:00 2001
From: Neo Xu <neo.xu1990@gmail.com>
Date: Mon, 5 Aug 2024 18:00:11 +0800
Subject: [PATCH] feat(example): add userdata example

Similar to lvgl user_data, the lua lvgl obj also have user_data for user. It uses userdata's uservalue for this purpose.

Signed-off-by: Neo Xu <neo.xu1990@gmail.com>
---
 examples/examples.lua  |  1 +
 examples/userdata.lua  | 29 +++++++++++++++++++++++++++++
 examples/uservalue.lua | 34 ----------------------------------
 3 files changed, 30 insertions(+), 34 deletions(-)
 create mode 100644 examples/userdata.lua
 delete mode 100644 examples/uservalue.lua

diff --git a/examples/examples.lua b/examples/examples.lua
index bfbc4e6..e64c15c 100644
--- a/examples/examples.lua
+++ b/examples/examples.lua
@@ -43,5 +43,6 @@ createBtn(container, "keyboard")
 createBtn(container, "animation")
 createBtn(container, "pointer")
 createBtn(container, "analogTime")
+createBtn(container, "userdata")
 createBtn(container, "flappyBird/flappyBird")
 createBtn(container, "tests")
diff --git a/examples/userdata.lua b/examples/userdata.lua
new file mode 100644
index 0000000..755b4c8
--- /dev/null
+++ b/examples/userdata.lua
@@ -0,0 +1,29 @@
+-- user_data can store any type of lua value
+local obj1 = lvgl.Label {
+    text_color = "#333",
+    border_color = "#f00",
+    border_width = 1,
+    align = lvgl.ALIGN.TOP_LEFT
+}
+
+obj1.user_data = 123.456
+obj1.text = "user_data:\n" .. obj1.user_data
+
+-- use user_data to store table
+local obj2 = lvgl.Label {
+    text_color = "#333",
+    border_color = "#f00",
+    border_width = 1,
+    align = lvgl.ALIGN.TOP_RIGHT
+}
+
+obj2.user_data = {
+    abc = "hello",
+    def = "world",
+    [1] = 123,
+}
+obj2.text = "user_data:"
+for k, v in pairs(obj2.user_data) do
+    print(k, v)
+    obj2.text = obj2.text .. string.format("%s: %s\n", k, v)
+end
diff --git a/examples/uservalue.lua b/examples/uservalue.lua
deleted file mode 100644
index 414d8f0..0000000
--- a/examples/uservalue.lua
+++ /dev/null
@@ -1,34 +0,0 @@
-collectgarbage("collect")
-print("initial: ", collectgarbage("count"))
-
-local str_t = {}
-for i = 1, 1024 * 1024 do
-    str_t[#str_t + 1] = 'a'
-end
-
-local str = table.concat(str_t)
-str_t = nil
-
-collectgarbage("collect")
-collectgarbage("collect")
-print("after string collect: ", collectgarbage("count"))
-
-for i = 1, 10 do
-    local label = lvgl.Label(nil)
-    label:set_text_static(str)
-    label:delete()
-end
-str = nil
-
-print("after set text: ", collectgarbage("count"))
-collectgarbage("collect")
-print("after collect: ", collectgarbage("count"))
-print("again: ", collectgarbage("count"))
-collectgarbage("collect")
-print("again2: ", collectgarbage("count"))
-collectgarbage("collect")
-print("again3: ", collectgarbage("count"))
-
-local label = lvgl.Label(nil)
-label:set({ text = "Test Done" })
-label:center()