layout/style/MappedDeclarations.h
author Cosmin Sabou <csabou@mozilla.com>
Thu, 02 Aug 2018 19:59:53 +0300
changeset 484986 f7f4ba3486b5e44b6ccdc3b150f5aa0aab76ffb7
parent 478627 5ba328c141b7b84bb0b6b836740b22d1d84b5380
child 505383 6f3709b3878117466168c40affa7bca0b60cf75b
permissions -rw-r--r--
Backed out changeset 5950c9d63c3b (bug 1090497) for build bustages on several files. CLOSED TREE

/* -*- 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/. */

/* Representation of a declaration block used for attribute mapping */

#ifndef mozilla_MappedDeclarations_h
#define mozilla_MappedDeclarations_h

#include "mozilla/FontPropertyTypes.h"
#include "mozilla/ServoBindingTypes.h"
#include "mozilla/ServoBindings.h"
#include "nsCSSPropertyID.h"
#include "nsCSSValue.h"
#include "nsColor.h"

class nsAttrValue;

namespace mozilla {

// This provides a convenient interface for attribute mappers
// (MapAttributesIntoRule) to modify the presentation attribute declaration
// block for a given element.
class MappedDeclarations final
{
public:
  explicit MappedDeclarations(nsIDocument* aDoc,
                              already_AddRefed<RawServoDeclarationBlock> aDecls)
    : mDocument(aDoc)
    , mDecl(aDecls)
  {
    MOZ_ASSERT(mDecl);
  }

  ~MappedDeclarations()
  {
    MOZ_ASSERT(!mDecl, "Forgot to take the block?");
  }

  nsIDocument* Document()
  {
    return mDocument;
  }

  already_AddRefed<RawServoDeclarationBlock> TakeDeclarationBlock()
  {
    MOZ_ASSERT(mDecl);
    return mDecl.forget();
  }

  // Check if we already contain a certain longhand
  bool PropertyIsSet(nsCSSPropertyID aId) const
  {
    return Servo_DeclarationBlock_PropertyIsSet(mDecl, aId);
  }

  // Set a property to an identifier (string)
  void SetIdentStringValue(nsCSSPropertyID aId, const nsString& aValue)
  {
    RefPtr<nsAtom> atom = NS_AtomizeMainThread(aValue);
    SetIdentAtomValue(aId, atom);
  }

  void SetIdentStringValueIfUnset(nsCSSPropertyID aId, const nsString& aValue)
  {
    if (!PropertyIsSet(aId)) {
      SetIdentStringValue(aId, aValue);
    }
  }

  void SetIdentAtomValue(nsCSSPropertyID aId, nsAtom* aValue);

  void SetIdentAtomValueIfUnset(nsCSSPropertyID aId, nsAtom* aValue)
  {
    if (!PropertyIsSet(aId)) {
      SetIdentAtomValue(aId, aValue);
    }
  }

  // Set a property to a keyword (usually NS_STYLE_* or StyleFoo::*)
  void SetKeywordValue(nsCSSPropertyID aId, int32_t aValue)
  {
    Servo_DeclarationBlock_SetKeywordValue(mDecl, aId, aValue);
  }

  void SetKeywordValueIfUnset(nsCSSPropertyID aId, int32_t aValue)
  {
    if (!PropertyIsSet(aId)) {
      SetKeywordValue(aId, aValue);
    }
  }

  template<typename T,
           typename = typename std::enable_if<std::is_enum<T>::value>::type>
  void SetKeywordValue(nsCSSPropertyID aId, T aValue)
  {
    static_assert(mozilla::EnumTypeFitsWithin<T, int32_t>::value,
                  "aValue must be an enum that fits within 32 bits");
    SetKeywordValue(aId, static_cast<int32_t>(aValue));
  }
  template<typename T,
           typename = typename std::enable_if<std::is_enum<T>::value>::type>
  void SetKeywordValueIfUnset(nsCSSPropertyID aId, T aValue)
  {
    static_assert(mozilla::EnumTypeFitsWithin<T, int32_t>::value,
                  "aValue must be an enum that fits within 32 bits");
    SetKeywordValueIfUnset(aId, static_cast<int32_t>(aValue));
  }

  // Set a property to an integer value
  void SetIntValue(nsCSSPropertyID aId, int32_t aValue)
  {
    Servo_DeclarationBlock_SetIntValue(mDecl, aId, aValue);
  }

  // Set a property to a pixel value
  void SetPixelValue(nsCSSPropertyID aId, float aValue)
  {
    Servo_DeclarationBlock_SetPixelValue(mDecl, aId, aValue);
  }

  void SetPixelValueIfUnset(nsCSSPropertyID aId, float aValue)
  {
    if (!PropertyIsSet(aId)) {
      SetPixelValue(aId, aValue);
    }
  }

  void SetLengthValue(nsCSSPropertyID aId, const nsCSSValue& aValue)
  {
    MOZ_ASSERT(aValue.IsLengthUnit());
    Servo_DeclarationBlock_SetLengthValue(
      mDecl, aId, aValue.GetFloatValue(), aValue.GetUnit());
  }

  // Set a property to a number value
  void SetNumberValue(nsCSSPropertyID aId, float aValue)
  {
    Servo_DeclarationBlock_SetNumberValue(mDecl, aId, aValue);
  }

  // Set a property to a percent value
  void SetPercentValue(nsCSSPropertyID aId, float aValue)
  {
    Servo_DeclarationBlock_SetPercentValue(mDecl, aId, aValue);
  }

  void SetPercentValueIfUnset(nsCSSPropertyID aId, float aValue)
  {
    if (!PropertyIsSet(aId)) {
      SetPercentValue(aId, aValue);
    }
  }

  // Set a property to `auto`
  void SetAutoValue(nsCSSPropertyID aId)
  {
    Servo_DeclarationBlock_SetAutoValue(mDecl, aId);
  }

  void SetAutoValueIfUnset(nsCSSPropertyID aId)
  {
    if (!PropertyIsSet(aId)) {
      SetAutoValue(aId);
    }
  }

  // Set a property to `currentcolor`
  void SetCurrentColor(nsCSSPropertyID aId)
  {
    Servo_DeclarationBlock_SetCurrentColor(mDecl, aId);
  }

  void SetCurrentColorIfUnset(nsCSSPropertyID aId)
  {
    if (!PropertyIsSet(aId)) {
      SetCurrentColor(aId);
    }
  }

  // Set a property to an RGBA nscolor value
  void SetColorValue(nsCSSPropertyID aId, nscolor aValue)
  {
    Servo_DeclarationBlock_SetColorValue(mDecl, aId, aValue);
  }

  void SetColorValueIfUnset(nsCSSPropertyID aId, nscolor aValue)
  {
    if (!PropertyIsSet(aId)) {
      SetColorValue(aId, aValue);
    }
  }

  // Set font-family to a string
  void SetFontFamily(const nsString& aValue)
  {
    Servo_DeclarationBlock_SetFontFamily(mDecl, aValue);
  }

  // Add a quirks-mode override to the decoration color of elements nested in <a>
  void SetTextDecorationColorOverride()
  {
    Servo_DeclarationBlock_SetTextDecorationColorOverride(mDecl);
  }

  void SetBackgroundImage(const nsAttrValue& value);

private:
  nsIDocument* const mDocument;
  RefPtr<RawServoDeclarationBlock> mDecl;
};

} // namespace mozilla

#endif // mozilla_MappedDeclarations_h