1 files changed, 52 insertions, 0 deletions
diff --git a/layout/forms/nsSelectsAreaFrame.h b/layout/forms/nsSelectsAreaFrame.h
new file mode 100644
index 0000000000..e0e487bad7
--- /dev/null
+++ b/layout/forms/nsSelectsAreaFrame.h
@@ -0,0 +1,52 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* 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 nsSelectsAreaFrame_h___
+#define nsSelectsAreaFrame_h___
+
+#include "mozilla/Attributes.h"
+#include "nsBlockFrame.h"
+
+namespace mozilla {
+class PresShell;
+}  // namespace mozilla
+
+class nsSelectsAreaFrame final : public nsBlockFrame {
+ public:
+  NS_DECL_FRAMEARENA_HELPERS(nsSelectsAreaFrame)
+
+  friend nsContainerFrame* NS_NewSelectsAreaFrame(mozilla::PresShell* aShell,
+                                                  ComputedStyle* aStyle,
+                                                  nsFrameState aFlags);
+
+  virtual void BuildDisplayList(nsDisplayListBuilder* aBuilder,
+                                const nsDisplayListSet& aLists) override;
+
+  void BuildDisplayListInternal(nsDisplayListBuilder* aBuilder,
+                                const nsDisplayListSet& aLists);
+
+  virtual void Reflow(nsPresContext* aCX, ReflowOutput& aDesiredSize,
+                      const ReflowInput& aReflowInput,
+                      nsReflowStatus& aStatus) override;
+
+  nscoord BSizeOfARow() const { return mBSizeOfARow; }
+
+ protected:
+  explicit nsSelectsAreaFrame(ComputedStyle* aStyle,
+                              nsPresContext* aPresContext)
+      : nsBlockFrame(aStyle, aPresContext, kClassID),
+        // initialize to wacky value so first call of
+        // nsSelectsAreaFrame::Reflow will always invalidate
+        mBSizeOfARow(nscoord_MIN) {}
+
+  // We cache the block size of a single row so that changes to the
+  // "size" attribute, padding, etc. can all be handled with only one
+  // reflow.  We'll have to reflow twice if someone changes our font
+  // size or something like that, so that the block size of our options
+  // will change.
+  nscoord mBSizeOfARow;
+};
+
+#endif /* nsSelectsAreaFrame_h___ */