Implement error level on client side (#9817)

Add additional class names and style to components and error indicators to distinguish different error levels.

Vaadin 8 implementation of #9816. Cherry picked changes and added compatibility package component changes and tests.

Resolves #3139

3 files changed, 77 insertions, 3 deletions

diff --git a/shared/src/main/java/com/vaadin/shared/AbstractComponentState.java b/shared/src/main/java/com/vaadin/shared/AbstractComponentState.java
index 81f808f676..9b949111a7 100644
--- a/shared/src/main/java/com/vaadin/shared/AbstractComponentState.java
+++ b/shared/src/main/java/com/vaadin/shared/AbstractComponentState.java
@@ -21,6 +21,7 @@ import java.util.List;
 import com.vaadin.shared.annotations.NoLayout;
 import com.vaadin.shared.communication.SharedState;
 import com.vaadin.shared.ui.ContentMode;
+import com.vaadin.shared.ui.ErrorLevel;
 
 /**
  * Default shared state implementation for AbstractComponent.
@@ -43,9 +44,15 @@ public class AbstractComponentState extends SharedState {
     public String id = null;
     public String primaryStyleName = null;
 
-    // HTML formatted error message for the component
-    // TODO this could be an object with more information, but currently the UI
-    // only uses the message
+    /** HTML formatted error message for the component */
     public String errorMessage = null;
+
+    /**
+     * Level of error
+     *
+     * @since 8.2
+     */
+    public ErrorLevel errorLevel = null;
+
     public boolean captionAsHtml = false;
 }
diff --git a/shared/src/main/java/com/vaadin/shared/ui/ErrorLevel.java b/shared/src/main/java/com/vaadin/shared/ui/ErrorLevel.java
new file mode 100644
index 0000000000..fe216fb878
--- /dev/null
+++ b/shared/src/main/java/com/vaadin/shared/ui/ErrorLevel.java
@@ -0,0 +1,58 @@
+/*
+ * Copyright 2000-2016 Vaadin Ltd.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License"); you may not
+ * use this file except in compliance with the License. You may obtain a copy of
+ * the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations under
+ * the License.
+ */
+package com.vaadin.shared.ui;
+
+/**
+ * Represents the error levels displayed on components.
+ * @author Vaadin Ltd
+ * @since
+ */
+public enum ErrorLevel {
+
+    /**
+     * Error level for informational messages.
+     */
+    INFO,
+
+    /**
+     * Error level for warning messages.
+     */
+    WARNING,
+
+    /**
+     * Error level for regular messages.
+     */
+    ERROR,
+
+    /**
+     * Error level for critical messages.
+     */
+    CRITICAL,
+
+    /**
+     * Error level for system errors and bugs.
+     */
+    SYSTEM;
+
+    /**
+     * Integer representation of error severity for comparison
+     *
+     * @return integer for error severity
+     */
+    public int intValue() {
+        return ordinal();
+    }
+}
diff --git a/shared/src/main/java/com/vaadin/shared/ui/tabsheet/TabState.java b/shared/src/main/java/com/vaadin/shared/ui/tabsheet/TabState.java
index 763f2cf20f..b337d4f063 100644
--- a/shared/src/main/java/com/vaadin/shared/ui/tabsheet/TabState.java
+++ b/shared/src/main/java/com/vaadin/shared/ui/tabsheet/TabState.java
@@ -19,6 +19,8 @@ import java.io.Serializable;
 
 import com.vaadin.shared.ui.ContentMode;
 
+import com.vaadin.shared.ui.ErrorLevel;
+
 /**
  * Shared state of a single tab in a Tabsheet or an Accordion.
  *
@@ -36,6 +38,13 @@ public class TabState implements Serializable {
     public String styleName;
     public String key;
     public String componentError;
+
+    /**
+     * Represents the level of error on a tab.
+     *
+     * @since 8.2
+     */
+    public ErrorLevel componentErrorLevel;
     public String id;
     public String iconAltText;