gecko-dev/layout/forms/nsSelectsAreaFrame.h

/* -*- 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 nsSelectsAreaFrame_h___
#define nsSelectsAreaFrame_h___

#include "mozilla/Attributes.h"
#include "nsBlockFrame.h"

class nsSelectsAreaFrame : public nsBlockFrame
{
public:
  NS_DECL_FRAMEARENA_HELPERS

  friend nsIFrame* NS_NewSelectsAreaFrame(nsIPresShell* aShell, nsStyleContext* aContext, nsFrameState aFlags);

  virtual void BuildDisplayList(nsDisplayListBuilder*   aBuilder,
                                const nsRect&           aDirtyRect,
                                const nsDisplayListSet& aLists) MOZ_OVERRIDE;

  void BuildDisplayListInternal(nsDisplayListBuilder*   aBuilder,
                                const nsRect&           aDirtyRect,
                                const nsDisplayListSet& aLists);

  virtual nsresult Reflow(nsPresContext*           aCX,
                          nsHTMLReflowMetrics&     aDesiredSize,
                          const nsHTMLReflowState& aReflowState,
                          nsReflowStatus&          aStatus) MOZ_OVERRIDE;

  nscoord HeightOfARow() const { return mHeightOfARow; }
  
protected:
  nsSelectsAreaFrame(nsStyleContext* aContext) :
    nsBlockFrame(aContext),
    mHeightOfARow(0)
  {}

  // We cache the height 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 heights of our options will change.
  nscoord mHeightOfARow;
};

#endif /* nsSelectsAreaFrame_h___ */