Updated mini tutorial source code (#9499)

1 files changed, 18 insertions, 3 deletions

diff --git a/uitest/src/com/vaadin/tests/minitutorials/v7b1/Addition.java b/uitest/src/com/vaadin/tests/minitutorials/v7b1/Addition.java
index 7e1c9ecf2a..a91df49508 100644
--- a/uitest/src/com/vaadin/tests/minitutorials/v7b1/Addition.java
+++ b/uitest/src/com/vaadin/tests/minitutorials/v7b1/Addition.java
@@ -22,14 +22,23 @@ import com.vaadin.ui.AbstractComponent;
 public class Addition extends AbstractComponent {
     private int term1;
     private int term2;
+    private boolean needsRecalculation = false;
 
     public void setTerm1(int value1) {
-        this.term1 = value1;
+        term1 = value1;
+        needsRecalculation = true;
+
+        // Mark the component as dirty to ensure beforeClientResponse will be
+        // invoked
         markAsDirty();
     }
 
     public void setTerm2(int value2) {
-        this.term2 = value2;
+        term2 = value2;
+        needsRecalculation = true;
+
+        // Mark the component as dirty to ensure beforeClientResponse will be
+        // invoked
         markAsDirty();
     }
 
@@ -39,7 +48,13 @@ public class Addition extends AbstractComponent {
 
     @Override
     public void beforeClientResponse(boolean initial) {
-        getState().sum = calculateSum();
+        super.beforeClientResponse(initial);
+        if (needsRecalculation) {
+            needsRecalculation = false;
+            // This could be an expensive operation that we don't want to do
+            // every time setTerm1 or setTerm2 is invoked.
+            getState().sum = calculateSum();
+        }
     }
 
     @Override