gecko-dev/layout/xul/nsSprocketLayout.h

/* -*- 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 nsSprocketLayout_h___
#define nsSprocketLayout_h___

#include "mozilla/Attributes.h"
#include "nsBoxLayout.h"
#include "nsCOMPtr.h"
#include "nsIFrame.h"

class nsBoxSize {
 public:
  nsBoxSize();

  nscoord pref;
  nscoord min;
  nscoord max;
  nscoord flex;
  nscoord left;
  nscoord right;
  bool collapsed;
  bool bogus;

  nsBoxSize* next;

  void* operator new(size_t sz, nsBoxLayoutState& aState) noexcept(true);
  void operator delete(void* aPtr, size_t sz);
};

class nsComputedBoxSize {
 public:
  nsComputedBoxSize();

  nscoord size;
  bool valid;
  bool resized;
  nsComputedBoxSize* next;

  void* operator new(size_t sz, nsBoxLayoutState& aState) noexcept(true);
  void operator delete(void* aPtr, size_t sz);
};

#define GET_WIDTH(size, isHorizontal) (isHorizontal ? size.width : size.height)
#define GET_HEIGHT(size, isHorizontal) (isHorizontal ? size.height : size.width)
#define GET_X(size, isHorizontal) (isHorizontal ? size.x : size.y)
#define GET_Y(size, isHorizontal) (isHorizontal ? size.y : size.x)
#define GET_COORD(aX, aY, isHorizontal) (isHorizontal ? aX : aY)

#define SET_WIDTH(size, coord, isHorizontal) \
  if (isHorizontal) {                        \
    (size).width = (coord);                  \
  } else {                                   \
    (size).height = (coord);                 \
  }
#define SET_HEIGHT(size, coord, isHorizontal) \
  if (isHorizontal) {                         \
    (size).height = (coord);                  \
  } else {                                    \
    (size).width = (coord);                   \
  }
#define SET_X(size, coord, isHorizontal) \
  if (isHorizontal) {                    \
    (size).x = (coord);                  \
  } else {                               \
    (size).y = (coord);                  \
  }
#define SET_Y(size, coord, isHorizontal) \
  if (isHorizontal) {                    \
    (size).y = (coord);                  \
  } else {                               \
    (size).x = (coord);                  \
  }

#define SET_COORD(aX, aY, coord, isHorizontal) \
  if (isHorizontal) {                          \
    aX = (coord);                              \
  } else {                                     \
    aY = (coord);                              \
  }

nsresult NS_NewSprocketLayout(nsCOMPtr<nsBoxLayout>& aNewLayout);

class nsSprocketLayout : public nsBoxLayout {
 public:
  friend nsresult NS_NewSprocketLayout(nsCOMPtr<nsBoxLayout>& aNewLayout);
  static void Shutdown();

  NS_IMETHOD XULLayout(nsIFrame* aBox, nsBoxLayoutState& aState) override;

  virtual nsSize GetXULPrefSize(nsIFrame* aBox,
                                nsBoxLayoutState& aBoxLayoutState) override;
  virtual nsSize GetXULMinSize(nsIFrame* aBox,
                               nsBoxLayoutState& aBoxLayoutState) override;
  virtual nsSize GetXULMaxSize(nsIFrame* aBox,
                               nsBoxLayoutState& aBoxLayoutState) override;
  virtual nscoord GetAscent(nsIFrame* aBox,
                            nsBoxLayoutState& aBoxLayoutState) override;

  nsSprocketLayout();

  static bool IsXULHorizontal(nsIFrame* aBox);

  static void SetLargestSize(nsSize& aSize1, const nsSize& aSize2,
                             bool aIsHorizontal);
  static void SetSmallestSize(nsSize& aSize1, const nsSize& aSize2,
                              bool aIsHorizontal);

  static void AddLargestSize(nsSize& aSize, const nsSize& aSizeToAdd,
                             bool aIsHorizontal);
  static void AddSmallestSize(nsSize& aSize, const nsSize& aSizeToAdd,
                              bool aIsHorizontal);
  static void AddCoord(nscoord& aCoord, nscoord aCoordToAdd);

 protected:
  void ComputeChildsNextPosition(nsIFrame* aBox, const nscoord& aCurX,
                                 const nscoord& aCurY, nscoord& aNextX,
                                 nscoord& aNextY, const nsRect& aChildSize);

  void ChildResized(nsIFrame* aBox, nsBoxLayoutState& aState, nsIFrame* aChild,
                    nsBoxSize* aChildBoxSize,
                    nsComputedBoxSize* aChildComputedBoxSize,
                    nsBoxSize* aBoxSizes, nsComputedBoxSize* aComputedBoxSizes,
                    const nsRect& aChildLayoutRect, nsRect& aChildActualRect,
                    nsRect& aContainingRect, int32_t aFlexes, bool& aFinished);

  void AlignChildren(nsIFrame* aBox, nsBoxLayoutState& aState);

  virtual void ComputeChildSizes(nsIFrame* aBox, nsBoxLayoutState& aState,
                                 nscoord& aGivenSize, nsBoxSize* aBoxSizes,
                                 nsComputedBoxSize*& aComputedBoxSizes);

  virtual void PopulateBoxSizes(nsIFrame* aBox,
                                nsBoxLayoutState& aBoxLayoutState,
                                nsBoxSize*& aBoxSizes, nscoord& aMinSize,
                                nscoord& aMaxSize, int32_t& aFlexes);

  virtual void InvalidateComputedSizes(nsComputedBoxSize* aComputedBoxSizes);

  virtual bool GetDefaultFlex(int32_t& aFlex);

  virtual void GetFrameState(nsIFrame* aBox, nsFrameState& aState);

 private:
  // because the sprocket layout manager has no instance variables. We
  // can make a static one and reuse it everywhere.
  static nsBoxLayout* gInstance;
};

#endif