/* -*- Mode: C++; tab-width: 8; 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 mozilla_StyleSetHandle_h
#define mozilla_StyleSetHandle_h

#include "mozilla/EventStates.h"
#include "mozilla/RefPtr.h"
#include "mozilla/SheetType.h"
#include "mozilla/StyleSheet.h"
#include "nsChangeHint.h"
#include "nsCSSPseudoElements.h"
#include "nsTArray.h"

namespace mozilla {
class CSSStyleSheet;
namespace dom {
class Element;
} // namespace dom
} // namespace mozilla
class nsIAtom;
class nsIContent;
class nsIDocument;
class nsStyleContext;
class nsStyleSet;
class nsPresContext;
struct TreeMatchContext;

namespace mozilla {

/**
 * Smart pointer class that can hold a pointer to an nsStyleSet.
 */
class StyleSetHandle
{
public:
  // We define this Ptr class with a StyleSet API that forwards on to the
  // wrapped pointer, rather than putting these methods on StyleSetHandle
  // itself, so that we can have StyleSetHandle behave like a smart pointer and
  // be dereferenced with operator->.
  class Ptr
  {
  public:
    friend class ::mozilla::StyleSetHandle;

    nsStyleSet* AsGecko()
    {
      return reinterpret_cast<nsStyleSet*>(mValue);
    }

    nsStyleSet* GetAsGecko() { return AsGecko(); }

    const nsStyleSet* AsGecko() const
    {
      return const_cast<Ptr*>(this)->AsGecko();
    }

    const nsStyleSet* GetAsGecko() const { return AsGecko(); }

    // These inline methods are defined in StyleSetHandleInlines.h.
    inline void Delete();

    // Style set interface.  These inline methods are defined in
    // StyleSetHandleInlines.h and just forward to the underlying
    // nsStyleSet.  See corresponding comments in nsStyleSet.h for
    // descriptions of these methods.

    inline void Init(nsPresContext* aPresContext);
    inline void BeginShutdown();
    inline void Shutdown();
    inline bool GetAuthorStyleDisabled() const;
    inline nsresult SetAuthorStyleDisabled(bool aStyleDisabled);
    inline void BeginUpdate();
    inline nsresult EndUpdate();
    inline already_AddRefed<nsStyleContext>
    ResolveStyleFor(dom::Element* aElement,
                    nsStyleContext* aParentContext);
    inline already_AddRefed<nsStyleContext>
    ResolveStyleFor(dom::Element* aElement,
                    nsStyleContext* aParentContext,
                    TreeMatchContext& aTreeMatchContext);
    inline already_AddRefed<nsStyleContext>
    ResolveStyleForText(nsIContent* aTextNode,
                        nsStyleContext* aParentContext);
    inline already_AddRefed<nsStyleContext>
    ResolveStyleForOtherNonElement(nsStyleContext* aParentContext);
    inline already_AddRefed<nsStyleContext>
    ResolvePseudoElementStyle(dom::Element* aParentElement,
                              mozilla::CSSPseudoElementType aType,
                              nsStyleContext* aParentContext,
                              dom::Element* aPseudoElement);
    inline already_AddRefed<nsStyleContext>
    ResolveAnonymousBoxStyle(nsIAtom* aPseudoTag, nsStyleContext* aParentContext,
                             uint32_t aFlags = 0);
    inline nsresult AppendStyleSheet(SheetType aType, StyleSheet* aSheet);
    inline nsresult PrependStyleSheet(SheetType aType, StyleSheet* aSheet);
    inline nsresult RemoveStyleSheet(SheetType aType, StyleSheet* aSheet);
    inline nsresult ReplaceSheets(SheetType aType,
                           const nsTArray<RefPtr<StyleSheet>>& aNewSheets);
    inline nsresult InsertStyleSheetBefore(SheetType aType,
                                    StyleSheet* aNewSheet,
                                    StyleSheet* aReferenceSheet);
    inline int32_t SheetCount(SheetType aType) const;
    inline StyleSheet* StyleSheetAt(SheetType aType, int32_t aIndex) const;
    inline nsresult RemoveDocStyleSheet(StyleSheet* aSheet);
    inline nsresult AddDocStyleSheet(StyleSheet* aSheet, nsIDocument* aDocument);
    inline already_AddRefed<nsStyleContext>
    ProbePseudoElementStyle(dom::Element* aParentElement,
                            mozilla::CSSPseudoElementType aType,
                            nsStyleContext* aParentContext);
    inline already_AddRefed<nsStyleContext>
    ProbePseudoElementStyle(dom::Element* aParentElement,
                            mozilla::CSSPseudoElementType aType,
                            nsStyleContext* aParentContext,
                            TreeMatchContext& aTreeMatchContext,
                            dom::Element* aPseudoElement = nullptr);
    inline nsRestyleHint HasStateDependentStyle(dom::Element* aElement,
                                                EventStates aStateMask);
    inline nsRestyleHint HasStateDependentStyle(
        dom::Element* aElement,
        mozilla::CSSPseudoElementType aPseudoType,
        dom::Element* aPseudoElement,
        EventStates aStateMask);

    inline void RootStyleContextAdded();
    inline void RootStyleContextRemoved();

  private:
    // Stores a pointer to an nsStyleSet.  The least
    // significant bit is 0 for the former, 1 for the latter.  This is
    // valid as the least significant bit will never be used for a pointer
    // value on platforms we care about.
    uintptr_t mValue;
  };

  StyleSetHandle() { mPtr.mValue = 0; }
  StyleSetHandle(const StyleSetHandle& aOth) { mPtr.mValue = aOth.mPtr.mValue; }
  MOZ_IMPLICIT StyleSetHandle(nsStyleSet* aSet) { *this = aSet; }

  StyleSetHandle& operator=(nsStyleSet* aStyleSet)
  {
    mPtr.mValue = reinterpret_cast<uintptr_t>(aStyleSet);
    return *this;
  }

  // Make StyleSetHandle usable in boolean contexts.
  explicit operator bool() const { return !!mPtr.mValue; }
  bool operator!() const { return !mPtr.mValue; }

  // Make StyleSetHandle behave like a smart pointer.
  Ptr* operator->() { return &mPtr; }
  const Ptr* operator->() const { return &mPtr; }

private:
  Ptr mPtr;
};

} // namespace mozilla

#endif // mozilla_StyleSetHandle_h