Merge pull request GwtMaterialDesign#342 from vegegoku/master

issue GwtMaterialDesign#317

gwt-material/src/main/java/gwt/material/design/client/ui/MaterialValueBox.java

@@ -1,5 +1,8 @@
 package gwt.material.design.client.ui;
 
+import com.google.gwt.core.client.Scheduler;
+import com.google.gwt.core.client.Scheduler.ScheduledCommand;
+
 /*
  * #%L
  * GwtMaterial
@@ -530,8 +533,32 @@ public void setAccessKey(char key) {
     }
 
     @Override
-    public void setFocus(boolean focused) {
-        valueBoxBase.setFocus(focused);
+    public void setFocus(final boolean focused) {
+	Scheduler.get().scheduleDeferred(new ScheduledCommand() {
+
+	    @Override
+	    public void execute() {
+		valueBoxBase.setFocus(focused);
+		if (focused) {
+		    label.addStyleName("active");
+		} else {
+		    updateLabelActiveStyle();
+		}
+	    }
+	});
+    }
+
+    /**
+     * Updates the style of the field label according to the field value if the
+     * field value is empty - null or "" - removes the label 'active' style else
+     * will add the 'active' style to the field label.
+     */
+    private void updateLabelActiveStyle() {
+	if (this.valueBoxBase.getText() != null && !this.valueBoxBase.getText().isEmpty()) {
+	    label.addStyleName("active");
+	} else {
+	    label.removeStyleName("active");
+	}
     }
 
     @Override