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::dom {
  21
  22 /**
  23  * CSSValue - a DOM object representing values in DOM computed style.
  24  */
  25 class CSSValue : public RefCounted<CSSValue> {
  26  public:
  27   MOZ_DECLARE_REFCOUNTED_TYPENAME(CSSValue);
  28   enum : uint16_t {
  29     CSS_INHERIT,
  30     CSS_PRIMITIVE_VALUE,
  31     CSS_VALUE_LIST,
  32     CSS_CUSTOM,
  33   };
  34
  35   // CSSValue
  36   virtual void GetCssText(nsAString&) = 0;
  37   virtual uint16_t CssValueType() const = 0;
  38
  39   virtual ~CSSValue() = default;
  40
  41   // Downcasting
  42
  43   /**
  44    * Return this as a nsROCSSPrimitiveValue* if its a primitive value, and null
  45    * otherwise.
  46    *
  47    * Defined in nsROCSSPrimitiveValue.h.
  48    */
  49   inline nsROCSSPrimitiveValue* AsPrimitiveValue();
  50 };
  51
  52 }  // namespace mozilla::dom
  53
  54 #endif