layout/forms/nsSelectsAreaFrame.h

   1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
   2 /* vim: set ts=8 sts=2 et sw=2 tw=80: */
   3 /* This Source Code Form is subject to the terms of the Mozilla Public
   4  * License, v. 2.0. If a copy of the MPL was not distributed with this
   5  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   6 #ifndef nsSelectsAreaFrame_h___
   7 #define nsSelectsAreaFrame_h___
   8
   9 #include "mozilla/Attributes.h"
  10 #include "nsBlockFrame.h"
  11
  12 namespace mozilla {
  13 class PresShell;
  14 }  // namespace mozilla
  15
  16 class nsSelectsAreaFrame final : public nsBlockFrame {
  17  public:
  18   NS_DECL_FRAMEARENA_HELPERS(nsSelectsAreaFrame)
  19
  20   friend nsContainerFrame* NS_NewSelectsAreaFrame(mozilla::PresShell* aShell,
  21                                                   ComputedStyle* aStyle,
  22                                                   nsFrameState aFlags);
  23
  24   virtual void BuildDisplayList(nsDisplayListBuilder* aBuilder,
  25                                 const nsDisplayListSet& aLists) override;
  26
  27   void BuildDisplayListInternal(nsDisplayListBuilder* aBuilder,
  28                                 const nsDisplayListSet& aLists);
  29
  30   virtual void Reflow(nsPresContext* aCX, ReflowOutput& aDesiredSize,
  31                       const ReflowInput& aReflowInput,
  32                       nsReflowStatus& aStatus) override;
  33
  34   nscoord BSizeOfARow() const { return mBSizeOfARow; }
  35
  36  protected:
  37   explicit nsSelectsAreaFrame(ComputedStyle* aStyle,
  38                               nsPresContext* aPresContext)
  39       : nsBlockFrame(aStyle, aPresContext, kClassID),
  40         // initialize to wacky value so first call of
  41         // nsSelectsAreaFrame::Reflow will always invalidate
  42         mBSizeOfARow(nscoord_MIN) {}
  43
  44   // We cache the block size of a single row so that changes to the
  45   // "size" attribute, padding, etc. can all be handled with only one
  46   // reflow.  We'll have to reflow twice if someone changes our font
  47   // size or something like that, so that the block size of our options
  48   // will change.
  49   nscoord mBSizeOfARow;
  50 };
  51
  52 #endif /* nsSelectsAreaFrame_h___ */