1 files changed, 79 insertions, 0 deletions
diff --git a/java/com/google/gwtexpui/user/client/Tooltip.java b/java/com/google/gwtexpui/user/client/Tooltip.java
new file mode 100644
index 0000000000..b5ce046f58
--- /dev/null
+++ b/java/com/google/gwtexpui/user/client/Tooltip.java
@@ -0,0 +1,79 @@
+// Copyright (C) 2015 The Android Open Source Project
+//
+// 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.google.gwtexpui.user.client;
+
+import com.google.gwt.core.client.GWT;
+import com.google.gwt.dom.client.Element;
+import com.google.gwt.resources.client.ClientBundle;
+import com.google.gwt.resources.client.CssResource;
+import com.google.gwt.user.client.ui.UIObject;
+
+/** Displays custom tooltip message below an element. */
+public class Tooltip {
+  interface Resources extends ClientBundle {
+    Resources I = GWT.create(Resources.class);
+
+    @Source("tooltip.css")
+    Css css();
+  }
+
+  interface Css extends CssResource {
+    String tooltip();
+  }
+
+  static {
+    Resources.I.css().ensureInjected();
+  }
+
+  /**
+   * Add required supporting style to enable custom tooltip rendering.
+   *
+   * @param o widget whose element should display a tooltip on hover.
+   */
+  public static void addStyle(UIObject o) {
+    addStyle(o.getElement());
+  }
+
+  /**
+   * Add required supporting style to enable custom tooltip rendering.
+   *
+   * @param e element that should display a tooltip on hover.
+   */
+  public static void addStyle(Element e) {
+    e.addClassName(Resources.I.css().tooltip());
+  }
+
+  /**
+   * Set the text displayed on hover.
+   *
+   * @param o widget whose hover text is being set.
+   * @param text message to display on hover.
+   */
+  public static void setLabel(UIObject o, String text) {
+    setLabel(o.getElement(), text);
+  }
+
+  /**
+   * Set the text displayed on hover.
+   *
+   * @param e element whose hover text is being set.
+   * @param text message to display on hover.
+   */
+  public static void setLabel(Element e, String text) {
+    e.setAttribute("aria-label", text != null ? text : "");
+  }
+
+  private Tooltip() {}
+}