layout/style/CSSValue.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
   7 /* DOM object representing values in DOM computed style */
   8
   9 #ifndef mozilla_dom_CSSValue_h_
  10 #define mozilla_dom_CSSValue_h_
  11
  12 #include "nsStringFwd.h"
  13 #include "mozilla/RefCounted.h"
  14
  15 class nsROCSSPrimitiveValue;
  16 namespace mozilla {
  17 class ErrorResult;
  18 }  // namespace mozilla
  19
  20 namespace mozilla {
  21 namespace dom {
  22
  23 /**
  24  * CSSValue - a DOM object representing values in DOM computed style.
  25  */
  26 class CSSValue : public RefCounted<CSSValue> {
  27  public:
  28   MOZ_DECLARE_REFCOUNTED_TYPENAME(CSSValue);
  29   enum : uint16_t {
  30     CSS_INHERIT,
  31     CSS_PRIMITIVE_VALUE,
  32     CSS_VALUE_LIST,
  33     CSS_CUSTOM,
  34   };
  35
  36   // CSSValue
  37   virtual void GetCssText(nsString& aText, ErrorResult& aRv) = 0;
  38   virtual uint16_t CssValueType() const = 0;
  39
  40   virtual ~CSSValue() = default;
  41
  42   // Downcasting
  43
  44   /**
  45    * Return this as a nsROCSSPrimitiveValue* if its a primitive value, and null
  46    * otherwise.
  47    *
  48    * Defined in nsROCSSPrimitiveValue.h.
  49    */
  50   inline nsROCSSPrimitiveValue* AsPrimitiveValue();
  51 };
  52
  53 }  // namespace dom
  54 }  // namespace mozilla
  55
  56 #endif