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-rw-r--r--layout/base/nsIPercentBSizeObserver.h33
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diff --git a/layout/base/nsIPercentBSizeObserver.h b/layout/base/nsIPercentBSizeObserver.h
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+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef nsIPercentBSizeObserver_h___
+#define nsIPercentBSizeObserver_h___
+
+#include "nsQueryFrame.h"
+
+namespace mozilla {
+struct ReflowInput;
+} // namespace mozilla
+
+/**
+ * This interface is supported by frames that need to provide computed bsize
+ * values to children during reflow which would otherwise not happen. Currently
+ * only table cells support this.
+ */
+class nsIPercentBSizeObserver
+{
+public:
+ NS_DECL_QUERYFRAME_TARGET(nsIPercentBSizeObserver)
+
+ // Notify the observer that aReflowInput has no computed bsize,
+ // but it has a percent bsize
+ virtual void NotifyPercentBSize(const mozilla::ReflowInput& aReflowInput) = 0;
+
+ // Ask the observer if it should observe aReflowInput.frame
+ virtual bool NeedsToObserve(const mozilla::ReflowInput& aReflowInput) = 0;
+};
+
+#endif // nsIPercentBSizeObserver_h___