DOMRect.h - mozsearch

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/* -*- 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 MOZILLA_DOMRECT_H_

#define MOZILLA_DOMRECT_H_

#include <algorithm>

#include <cstdint>

#include <new>

#include <utility>

#include "js/TypeDecls.h"

#include "mozilla/AlreadyAddRefed.h"

#include "mozilla/Assertions.h"

#include "mozilla/FloatingPoint.h"

#include "mozilla/RefPtr.h"

#include "nsCOMPtr.h"

#include "nsCycleCollectionParticipant.h"

#include "nsISupports.h"

#include "nsTArray.h"

#include "nsWrapperCache.h"

class JSObject;

class nsIGlobalObject;

struct JSContext;

struct JSStructuredCloneReader;

struct JSStructuredCloneWriter;

struct nsRect;

namespace mozilla::dom {

class GlobalObject;

struct DOMRectInit;

class DOMRectReadOnly : public nsISupports, public nsWrapperCache {

 protected:

  virtual ~DOMRectReadOnly() = default;

 public:

  NS_DECL_CYCLE_COLLECTING_ISUPPORTS

  NS_DECL_CYCLE_COLLECTION_WRAPPERCACHE_CLASS(DOMRectReadOnly)

  explicit DOMRectReadOnly(nsISupports* aParent, double aX = 0, double aY = 0,

                           double aWidth = 0, double aHeight = 0)

      : mParent(aParent), mX(aX), mY(aY), mWidth(aWidth), mHeight(aHeight) {}

  nsISupports* GetParentObject() const {

    MOZ_ASSERT(mParent);

    return mParent;

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

  static already_AddRefed<DOMRectReadOnly> FromRect(const GlobalObject& aGlobal,

                                                    const DOMRectInit& aInit);

  static already_AddRefed<DOMRectReadOnly> Constructor(

      const GlobalObject& aGlobal, double aX, double aY, double aWidth,

      double aHeight);

  double X() const { return mX; }

  double Y() const { return mY; }

  double Width() const { return mWidth; }

  double Height() const { return mHeight; }

  double Left() const {

    double x = X(), w = Width();

    return NaNSafeMin(x, x + w);

  double Top() const {

    double y = Y(), h = Height();

    return NaNSafeMin(y, y + h);

  double Right() const {

    double x = X(), w = Width();

    return NaNSafeMax(x, x + w);

  double Bottom() const {

    double y = Y(), h = Height();

    return NaNSafeMax(y, y + h);

  bool WriteStructuredClone(JSContext* aCx,

                            JSStructuredCloneWriter* aWriter) const;

  static already_AddRefed<DOMRectReadOnly> ReadStructuredClone(

      JSContext* aCx, nsIGlobalObject* aGlobal,

      JSStructuredCloneReader* aReader);

 protected:

  // Shared implementation of ReadStructuredClone for DOMRect and

  // DOMRectReadOnly.

  bool ReadStructuredClone(JSStructuredCloneReader* aReader);

  nsCOMPtr<nsISupports> mParent;

  double mX, mY, mWidth, mHeight;

};

class DOMRect final : public DOMRectReadOnly {

 public:

  explicit DOMRect(nsISupports* aParent, double aX = 0, double aY = 0,

                   double aWidth = 0, double aHeight = 0)

      : DOMRectReadOnly(aParent, aX, aY, aWidth, aHeight) {}

  NS_INLINE_DECL_REFCOUNTING_INHERITED(DOMRect, DOMRectReadOnly)

  static already_AddRefed<DOMRect> FromRect(const GlobalObject& aGlobal,

                                            const DOMRectInit& aInit);

  static already_AddRefed<DOMRect> Constructor(const GlobalObject& aGlobal,

                                               double aX, double aY,

                                               double aWidth, double aHeight);

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

  static already_AddRefed<DOMRect> ReadStructuredClone(

      JSContext* aCx, nsIGlobalObject* aGlobal,

      JSStructuredCloneReader* aReader);

  using DOMRectReadOnly::ReadStructuredClone;

  void SetRect(float aX, float aY, float aWidth, float aHeight) {

    mX = aX;

    mY = aY;

    mWidth = aWidth;

    mHeight = aHeight;

  void SetLayoutRect(const nsRect& aLayoutRect);

  void SetX(double aX) { mX = aX; }

  void SetY(double aY) { mY = aY; }

  void SetWidth(double aWidth) { mWidth = aWidth; }

  void SetHeight(double aHeight) { mHeight = aHeight; }

  static DOMRect* FromSupports(nsISupports* aSupports) {

    return static_cast<DOMRect*>(aSupports);

 private:

  ~DOMRect() = default;

};

class DOMRectList final : public nsISupports, public nsWrapperCache {

  ~DOMRectList() = default;

 public:

  explicit DOMRectList(nsISupports* aParent) : mParent(aParent) {}

  NS_DECL_CYCLE_COLLECTING_ISUPPORTS

  NS_DECL_CYCLE_COLLECTION_WRAPPERCACHE_CLASS(DOMRectList)

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

  nsISupports* GetParentObject() { return mParent; }

  void Append(RefPtr<DOMRect>&& aElement) {

    mArray.AppendElement(std::move(aElement));

  uint32_t Length() { return mArray.Length(); }

  DOMRect* Item(uint32_t aIndex) { return mArray.SafeElementAt(aIndex); }

  DOMRect* IndexedGetter(uint32_t aIndex, bool& aFound) {

    aFound = aIndex < mArray.Length();

    if (!aFound) {

      return nullptr;

    return mArray[aIndex];

 protected:

  nsTArray<RefPtr<DOMRect> > mArray;

  nsCOMPtr<nsISupports> mParent;

};

}  // namespace mozilla::dom

#endif /*MOZILLA_DOMRECT_H_*/