Trigger update after iadd

Author: laffra

examples/reactive.py

@@ -27,6 +27,9 @@ def changed(self, name, value):
 product1 = Product(name="Wrench", delivery=0)
 product2 = Product(name="Drill", count=6, price=500, service=False)
 
+def increment_count(event):
+    product1.count += 10
+
 def order_hammers(event):
     product2.name = "Hammer"
     product2.count = 10
@@ -36,7 +39,6 @@ def order_hammers(event):
     product2.service = False
 
 def create_form(name, product):
-    print("Create form for", product)
     return ltk.VBox(
         ltk.Label(name),
         row(
@@ -86,7 +88,7 @@ def create():
                 .css("padding", 12)
                 .css("margin-bottom", 12)
                 .css("font-size", 24),
-            create_form("Product 1", product2)
+            create_form("Product 2", product2)
                 .css("border", "2px solid green")
                 .css("padding", 12)
                 .css("font-size", 24)
@@ -95,6 +97,10 @@ def create():
                 .css("margin-top", 24)
                 .css("border-radius", 8)
                 .css("padding", 12),
+            ltk.Button("Increment Product 1 count", increment_count)
+                .css("margin-top", 24)
+                .css("border-radius", 8)
+                .css("padding", 12),
         )
         .attr("id", "reactive")
         .attr("name", "Reactive")

ltk/widgets.py

@@ -645,6 +645,7 @@ def set_value(self, value):
         self.model.changed(self.name, self.value)
         for listener in self.listeners:
             listener(self)
+        return self.value
 
     def __int__(self): return int(self.value)         # pylint: disable=multiple-statements
     def __bool__(self): return bool(self.value)        # pylint: disable=multiple-statements
@@ -685,19 +686,19 @@ def __rxor__(self, value):       return value ^ self.value       # pylint: disab
     def __rrshift__(self, value):    return value >> self.value      # pylint: disable=multiple-statements
     def __rlshift__(self, value):    return value << self.value      # pylint: disable=multiple-statements
 
-    def __iadd__(self, value):       self.value += value        # pylint: disable=multiple-statements
-    def __isub__(self, value):       self.value -= value        # pylint: disable=multiple-statements
-    def __imul__(self, value):       self.value *= value        # pylint: disable=multiple-statements
-    def __itruediv__(self, value):   self.value /= value        # pylint: disable=multiple-statements
-    def __imod__(self, value):       self.value %= value        # pylint: disable=multiple-statements
-    def __ifloordiv__(self, value):  self.value //= value       # pylint: disable=multiple-statements
-    def __ipow__(self, value):       self.value **= value       # pylint: disable=multiple-statements
-    def __imatmul__(self, value):    self.value @= value        # pylint: disable=multiple-statements
-    def __iand__(self, value):       self.value &= value        # pylint: disable=multiple-statements
-    def __ior__(self, value):        self.value |= value        # pylint: disable=multiple-statements
-    def __ixor__(self, value):       self.value ^= value        # pylint: disable=multiple-statements
-    def __irshift__(self, value):    self.value >>= value       # pylint: disable=multiple-statements
-    def __ilshift__(self, value):    self.value <<= value       # pylint: disable=multiple-statements
+    def __iadd__(self, value):       return self.set_value(self.value + value)        # pylint: disable=multiple-statements
+    def __isub__(self, value):       return self.set_value(self.value - value)        # pylint: disable=multiple-statements
+    def __imul__(self, value):       return self.set_value(self.value * value)        # pylint: disable=multiple-statements
+    def __itruediv__(self, value):   return self.set_value(self.value / value)        # pylint: disable=multiple-statements
+    def __imod__(self, value):       return self.set_value(self.value % value)        # pylint: disable=multiple-statements
+    def __ifloordiv__(self, value):  return self.set_value(self.value // value)       # pylint: disable=multiple-statements
+    def __ipow__(self, value):       return self.set_value(self.value ** value)       # pylint: disable=multiple-statements
+    def __imatmul__(self, value):    return self.set_value(self.value @ value)        # pylint: disable=multiple-statements
+    def __iand__(self, value):       return self.set_value(self.value & value)        # pylint: disable=multiple-statements
+    def __ior__(self, value):        return self.set_value(self.value | value)        # pylint: disable=multiple-statements
+    def __ixor__(self, value):       return self.set_value(self.value ^ value)        # pylint: disable=multiple-statements
+    def __irshift__(self, value):    return self.set_value(self.value >> value)       # pylint: disable=multiple-statements
+    def __ilshift__(self, value):    return self.set_value(self.value << value)       # pylint: disable=multiple-statements
 
     def __divmod__(self, value):    return divmod(self.value, value)    # pylint: disable=multiple-statements
     def __rdivmod__(self, value):   return divmod(value, self.value)    # pylint: disable=multiple-statements