Fixed #961

Author: kevzlou7979

gwt-material/src/main/java/gwt/material/design/client/base/mixin/RequiredFieldMixin.java

@@ -32,7 +32,7 @@
 public class RequiredFieldMixin <T extends AbstractValueWidget & HasRequiredField, H extends UIObject>
         extends AbstractMixin<T> implements HasRequiredField {
 
-    private String REQUIRED = "required";
+    private final String REQUIRED = "required";
     private H targetLabel;
     private boolean required;
     private ToggleStyleMixin<UIObject> toggleStyleMixin;
@@ -51,8 +51,8 @@ public RequiredFieldMixin(T uiObject, H targetLabel) {
     public void setRequired(boolean required) {
         this.required = required;
 
-        uiObject.setValidateOnBlur(true);
-        uiObject.setAllowBlank(false);
+        uiObject.setValidateOnBlur(required);
+        uiObject.setAllowBlank(!required);
 
         if (targetLabel != null) {
             getToggleStyleMixin().setOn(required);

gwt-material/src/test/java/gwt/material/design/client/ui/MaterialValueBoxTest.java

@@ -112,10 +112,14 @@ protected <W extends MaterialValueBox> void checkMandatoryField(W widget) {
         widget.setRequired(true);
         assertTrue(widget.isRequired());
         assertTrue(widget.getStatusTextMixin().getPlaceholder().getElement().hasClassName(REQUIRED));
+        assertTrue(widget.isValidateOnBlur());
+        assertFalse(widget.isAllowBlank());
 
         widget.setRequired(false);
         assertFalse(widget.isRequired());
         assertFalse(widget.getStatusTextMixin().getPlaceholder().getElement().hasClassName(REQUIRED));
+        assertFalse(widget.isValidateOnBlur());
+        assertTrue(widget.isAllowBlank());
     }
 
     protected <W extends MaterialValueBox> void checkAutocomplete(W widget) {