Update example to show two products

Author: laffra

examples/reactive.py

@@ -5,9 +5,9 @@
 DELIVERY_OPTIONS = ["1-day", "2-day", "pickup"]
 
 class Product(ltk.Model):
-    name: str = "Wrench"
-    price: float = 50.0
     count: int = 10
+    name: str = "Screwdriver"
+    price: float = 50.0
     warranty: bool = False
     service: bool = True
     delivery: int = 1
@@ -24,10 +24,21 @@ def changed(self, name, value):
             - Delivery: {DELIVERY_OPTIONS[self.delivery]}
         """
 
-product = Product(count=60)
+product1 = Product(name="Wrench", delivery=0)
+product2 = Product(name="Drill", count=6, price=500, service=False)
 
-def create():
-    form = ltk.VBox(
+def order_hammers(event):
+    product2.name = "Hammer"
+    product2.count = 10
+    product2.price = 100.0
+    product2.warranty = True
+    product2.delivery = 2
+    product2.service = False
+
+def create_form(name, product):
+    print("Create form for", product)
+    return ltk.VBox(
+        ltk.Label(name),
         row(
             "Name:",
             ltk.Input(product.name).width(300)
@@ -65,31 +76,30 @@ def create():
             ltk.Text(product.summary)
         )
     )
+
+def create():
     return (
         ltk.VBox(
             ltk.Heading2("Reactive LTK Demo"),
-            form
+            create_form("Product 1", product1)
+                .css("border", "2px solid green")
+                .css("padding", 12)
+                .css("margin-bottom", 12)
+                .css("font-size", 24),
+            create_form("Product 1", product2)
                 .css("border", "2px solid green")
                 .css("padding", 12)
                 .css("font-size", 24)
                 .attr("name", "Reactive"),
-            ltk.Button("Buy Hammers", order_hammers)
+            ltk.Button("Set Product 2 to Hammer", order_hammers)
                 .css("margin-top", 24)
                 .css("border-radius", 8)
-            .css("padding", 12)
+                .css("padding", 12),
         )
         .attr("id", "reactive")
         .attr("name", "Reactive")
     )
 
-def order_hammers(event):
-    product.name = "Hammer"
-    product.count = 10
-    product.price = 100.0
-    product.warranty = True
-    product.delivery = 2
-    product.service = False
-
 def row(label, *widgets):
     return ltk.HBox(
         ltk.Text(label)

ltk/widgets.py

@@ -549,15 +549,24 @@ def __init__(self, **kwargs):
             getattr(self, name).set_value(value)
 
     def __setattr__(self, name: str, value):
-        if hasattr(self, name) and isinstance(getattr(self, name), ModelAttribute):
-            attribute = getattr(self, name)
-            attribute.set_value(value)
+        try:
+            if hasattr(self, name) and isinstance(getattr(self, name), ModelAttribute):
+                attribute = getattr(self, name)
+                attribute.set_value(value)
+                try:
+                    self.changed(name, value)
+                except Exception as e: #  pylint: disable=broad-except
+                    print(e)
+            else:
+                object.__setattr__(self, name, value)
+        except Exception as e: # pylint: disable=broad-except
+            print("Cannot set attribute", name, value, self, e)
             try:
-                self.changed(name, value)
-            except Exception as e: #  pylint: disable=broad-except
-                print(e)
-        else:
-            object.__setattr__(self, name, value)
+                import traceback
+                traceback.print_exc()
+            except:
+                pass
+            raise e
 
     def decode(self, json_encoding: str):
         """ Decode the JSON encoding of the model """
@@ -626,7 +635,10 @@ def get_value(self):
 
     def set_value(self, value):
         """ Set the value of the attribute """
-        typed_value = type(self.value)(value)
+        try:
+            typed_value = type(self.value)(value)
+        except:
+            typed_value = value
         if typed_value == self.value:
             return
         self.value = typed_value