1 files changed, 32 insertions, 0 deletions
diff --git a/src/main/java/com/google/gerrit/client/ui/LazyTabChild.java b/src/main/java/com/google/gerrit/client/ui/LazyTabChild.java
new file mode 100644
index 0000000000..d5ccfca3d5
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+++ b/src/main/java/com/google/gerrit/client/ui/LazyTabChild.java
@@ -0,0 +1,32 @@
+// Copyright 2008 Google Inc.
+//
+// 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.gerrit.client.ui;
+
+import com.google.gwt.user.client.ui.SimplePanel;
+import com.google.gwt.user.client.ui.Widget;
+
+/** Panel for use within a TabPanel to create the widget only on selection. */
+public abstract class LazyTabChild<T extends Widget> extends SimplePanel {
+  /** @return the widget to display in this panel. */
+  protected abstract T create();
+
+  @Override
+  public void setVisible(final boolean visible) {
+    if (visible && getWidget() == null) {
+      setWidget(create());
+    }
+    super.setVisible(visible);
+  }
+}