book: Use generated wrapper method

Author: Hofer-Julian

book/listings/g_object_properties/3/custom_button/imp.rs

@@ -58,7 +58,7 @@ impl WidgetImpl for CustomButton {}
 // Trait shared by all buttons
 impl ButtonImpl for CustomButton {
     fn clicked(&self) {
-        let incremented_number = self.number.get() + 1;
+        let incremented_number = self.obj().number() + 1;
         self.obj().set_number(incremented_number);
     }
 }

book/listings/g_object_signals/2/custom_button/imp.rs

@@ -69,7 +69,7 @@ static MAX_NUMBER: i32 = 8;
 // Trait shared by all buttons
 impl ButtonImpl for CustomButton {
     fn clicked(&self) {
-        let incremented_number = self.number.get() + 1;
+        let incremented_number = self.obj().number() + 1;
         let obj = self.obj();
         // If `number` reached `MAX_NUMBER`,
         // emit "max-number-reached" signal and set `number` back to 0

book/src/g_object_properties.md

@@ -67,7 +67,7 @@ Filename: <a class=file-link href="https://github.com/gtk-rs/gtk4-rs/blob/master
 ```
 
 We also have to adapt the `clicked` method.
-Before we modified `number` directly, now we can use the generated wrapper method `set_number`.
+Before we modified `number` directly, now we can use the generated wrapper methods `number` and `set_number`.
 This way the "notify" signal will be emitted, which is necessary for the bindings to work as expected.
 
 ```rust ,no_run,noplayground