gecko-dev/dom/html/HTMLFrameSetElement.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 HTMLFrameSetElement_h
#define HTMLFrameSetElement_h

#include "mozilla/Attributes.h"
#include "mozilla/UniquePtr.h"
#include "nsGenericHTMLElement.h"

/**
 * The nsFramesetUnit enum is used to denote the type of each entry
 * in the row or column spec.
 */
enum nsFramesetUnit {
  eFramesetUnit_Fixed = 0,
  eFramesetUnit_Percent,
  eFramesetUnit_Relative
};

/**
 * The nsFramesetSpec struct is used to hold a single entry in the
 * row or column spec.
 */
struct nsFramesetSpec {
  nsFramesetUnit mUnit;
  nscoord mValue;
};

/**
 * The maximum number of entries allowed in the frame set element row
 * or column spec.
 */
#define NS_MAX_FRAMESET_SPEC_COUNT 16000

//----------------------------------------------------------------------

namespace mozilla::dom {

class OnBeforeUnloadEventHandlerNonNull;

class HTMLFrameSetElement final : public nsGenericHTMLElement {
 public:
  explicit HTMLFrameSetElement(
      already_AddRefed<mozilla::dom::NodeInfo>&& aNodeInfo)
      : nsGenericHTMLElement(std::move(aNodeInfo)),
        mNumRows(0),
        mNumCols(0),
        mCurrentRowColHint(NS_STYLE_HINT_REFLOW) {
    SetHasWeirdParserInsertionMode();
  }

  NS_IMPL_FROMNODE_HTML_WITH_TAG(HTMLFrameSetElement, frameset)

  // nsISupports
  NS_INLINE_DECL_REFCOUNTING_INHERITED(HTMLFrameSetElement,
                                       nsGenericHTMLElement)

  void GetCols(DOMString& aCols) { GetHTMLAttr(nsGkAtoms::cols, aCols); }
  void SetCols(const nsAString& aCols, ErrorResult& aError) {
    SetHTMLAttr(nsGkAtoms::cols, aCols, aError);
  }
  void GetRows(DOMString& aRows) { GetHTMLAttr(nsGkAtoms::rows, aRows); }
  void SetRows(const nsAString& aRows, ErrorResult& aError) {
    SetHTMLAttr(nsGkAtoms::rows, aRows, aError);
  }

  bool IsEventAttributeNameInternal(nsAtom* aName) override;

  // Event listener stuff; we need to declare only the ones we need to
  // forward to window that don't come from nsIDOMHTMLFrameSetElement.
#define EVENT(name_, id_, type_, \
              struct_) /* nothing; handled by the superclass */
#define WINDOW_EVENT_HELPER(name_, type_) \
  type_* GetOn##name_();                  \
  void SetOn##name_(type_* handler);
#define WINDOW_EVENT(name_, id_, type_, struct_) \
  WINDOW_EVENT_HELPER(name_, EventHandlerNonNull)
#define BEFOREUNLOAD_EVENT(name_, id_, type_, struct_) \
  WINDOW_EVENT_HELPER(name_, OnBeforeUnloadEventHandlerNonNull)
#include "mozilla/EventNameList.h"  // IWYU pragma: keep
#undef BEFOREUNLOAD_EVENT
#undef WINDOW_EVENT
#undef WINDOW_EVENT_HELPER
#undef EVENT

  /**
   * GetRowSpec is used to get the "rows" spec.
   * @param out int32_t aNumValues The number of row sizes specified.
   * @param out nsFramesetSpec* aSpecs The array of size specifications.
            This is _not_ owned by the caller, but by the nsFrameSetElement
            implementation.  DO NOT DELETE IT.
   */
  nsresult GetRowSpec(int32_t* aNumValues, const nsFramesetSpec** aSpecs);
  /**
   * GetColSpec is used to get the "cols" spec
   * @param out int32_t aNumValues The number of row sizes specified.
   * @param out nsFramesetSpec* aSpecs The array of size specifications.
            This is _not_ owned by the caller, but by the nsFrameSetElement
            implementation.  DO NOT DELETE IT.
   */
  nsresult GetColSpec(int32_t* aNumValues, const nsFramesetSpec** aSpecs);

  bool ParseAttribute(int32_t aNamespaceID, nsAtom* aAttribute,
                      const nsAString& aValue,
                      nsIPrincipal* aMaybeScriptedPrincipal,
                      nsAttrValue& aResult) override;
  nsChangeHint GetAttributeChangeHint(const nsAtom* aAttribute,
                                      int32_t aModType) const override;

  nsresult Clone(dom::NodeInfo*, nsINode** aResult) const override;

 protected:
  virtual ~HTMLFrameSetElement();

  JSObject* WrapNode(JSContext*, JS::Handle<JSObject*> aGivenProto) override;

  void BeforeSetAttr(int32_t aNamespaceID, nsAtom* aName,
                     const nsAttrValue* aValue, bool aNotify) override;

 private:
  nsresult ParseRowCol(const nsAttrValue& aValue, int32_t& aNumSpecs,
                       UniquePtr<nsFramesetSpec[]>* aSpecs);

  /**
   * The number of size specs in our "rows" attr
   */
  int32_t mNumRows;
  /**
   * The number of size specs in our "cols" attr
   */
  int32_t mNumCols;
  /**
   * The style hint to return for the rows/cols attrs in
   * GetAttributeChangeHint
   */
  nsChangeHint mCurrentRowColHint;
  /**
   * The parsed representation of the "rows" attribute
   */
  UniquePtr<nsFramesetSpec[]> mRowSpecs;  // parsed, non-computed dimensions
  /**
   * The parsed representation of the "cols" attribute
   */
  UniquePtr<nsFramesetSpec[]> mColSpecs;  // parsed, non-computed dimensions
};

}  // namespace mozilla::dom

#endif  // HTMLFrameSetElement_h