layout/forms/nsSelectsAreaFrame.h

   1 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
   2 /* This Source Code Form is subject to the terms of the Mozilla Public
   3  * License, v. 2.0. If a copy of the MPL was not distributed with this
   4  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   5 #ifndef nsSelectsAreaFrame_h___
   6 #define nsSelectsAreaFrame_h___
   7
   8 #include "mozilla/Attributes.h"
   9 #include "nsBlockFrame.h"
  10
  11 class nsSelectsAreaFrame : public nsBlockFrame
  12 {
  13 public:
  14   NS_DECL_FRAMEARENA_HELPERS
  15
  16   friend nsIFrame* NS_NewSelectsAreaFrame(nsIPresShell* aShell, nsStyleContext* aContext, uint32_t aFlags);
  17
  18   virtual void BuildDisplayList(nsDisplayListBuilder*   aBuilder,
  19                                 const nsRect&           aDirtyRect,
  20                                 const nsDisplayListSet& aLists) MOZ_OVERRIDE;
  21
  22   void BuildDisplayListInternal(nsDisplayListBuilder*   aBuilder,
  23                                 const nsRect&           aDirtyRect,
  24                                 const nsDisplayListSet& aLists);
  25
  26   NS_IMETHOD Reflow(nsPresContext*          aCX,
  27                     nsHTMLReflowMetrics&     aDesiredSize,
  28                     const nsHTMLReflowState& aReflowState,
  29                     nsReflowStatus&          aStatus) MOZ_OVERRIDE;
  30
  31   nscoord HeightOfARow() const { return mHeightOfARow; }
  32
  33 protected:
  34   nsSelectsAreaFrame(nsStyleContext* aContext) :
  35     nsBlockFrame(aContext),
  36     mHeightOfARow(0)
  37   {}
  38
  39   // We cache the height of a single row so that changes to the "size"
  40   // attribute, padding, etc. can all be handled with only one reflow.  We'll
  41   // have to reflow twice if someone changes our font size or something like
  42   // that, so that the heights of our options will change.
  43   nscoord mHeightOfARow;
  44 };
  45
  46 #endif /* nsSelectsAreaFrame_h___ */