content/base/src/DOMRect.h

   1 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
   2 /* This Source Code Form is subject to the terms of the Mozilla Public
   3  * License, v. 2.0. If a copy of the MPL was not distributed with this
   4  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   5
   6 #ifndef MOZILLA_DOMRECT_H_
   7 #define MOZILLA_DOMRECT_H_
   8
   9 #include "nsIDOMClientRect.h"
  10 #include "nsIDOMClientRectList.h"
  11 #include "nsTArray.h"
  12 #include "nsCOMPtr.h"
  13 #include "nsAutoPtr.h"
  14 #include "nsWrapperCache.h"
  15 #include "nsCycleCollectionParticipant.h"
  16 #include "mozilla/Attributes.h"
  17
  18 struct nsRect;
  19
  20 namespace mozilla {
  21 namespace dom {
  22
  23 class DOMRect MOZ_FINAL : public nsIDOMClientRect
  24                         , public nsWrapperCache
  25 {
  26 public:
  27   DOMRect(nsISupports* aParent)
  28     : mParent(aParent), mX(0.0), mY(0.0), mWidth(0.0), mHeight(0.0)
  29   {
  30     SetIsDOMBinding();
  31   }
  32   virtual ~DOMRect() {}
  33
  34   void SetRect(float aX, float aY, float aWidth, float aHeight) {
  35     mX = aX; mY = aY; mWidth = aWidth; mHeight = aHeight;
  36   }
  37   void SetLayoutRect(const nsRect& aLayoutRect);
  38
  39
  40   NS_DECL_CYCLE_COLLECTING_ISUPPORTS
  41   NS_DECL_CYCLE_COLLECTION_SCRIPT_HOLDER_CLASS(DOMRect)
  42   NS_DECL_NSIDOMCLIENTRECT
  43
  44
  45   nsISupports* GetParentObject() const
  46   {
  47     MOZ_ASSERT(mParent);
  48     return mParent;
  49   }
  50   virtual JSObject* WrapObject(JSContext* aCx,
  51                                JS::Handle<JSObject*> aScope) MOZ_OVERRIDE;
  52
  53
  54   float Left() const
  55   {
  56     return mX;
  57   }
  58
  59   float Top() const
  60   {
  61     return mY;
  62   }
  63
  64   float Right() const
  65   {
  66     return mX + mWidth;
  67   }
  68
  69   float Bottom() const
  70   {
  71     return mY + mHeight;
  72   }
  73
  74   float Width() const
  75   {
  76     return mWidth;
  77   }
  78
  79   float Height() const
  80   {
  81     return mHeight;
  82   }
  83
  84 protected:
  85   nsCOMPtr<nsISupports> mParent;
  86   float mX, mY, mWidth, mHeight;
  87 };
  88
  89 class DOMRectList MOZ_FINAL : public nsIDOMClientRectList,
  90                               public nsWrapperCache
  91 {
  92 public:
  93   DOMRectList(nsISupports *aParent) : mParent(aParent)
  94   {
  95     SetIsDOMBinding();
  96   }
  97
  98   NS_DECL_CYCLE_COLLECTING_ISUPPORTS
  99   NS_DECL_CYCLE_COLLECTION_SCRIPT_HOLDER_CLASS(DOMRectList)
 100
 101   NS_DECL_NSIDOMCLIENTRECTLIST
 102
 103   virtual JSObject* WrapObject(JSContext *cx,
 104                                JS::Handle<JSObject*> scope) MOZ_OVERRIDE;
 105
 106   nsISupports* GetParentObject()
 107   {
 108     return mParent;
 109   }
 110
 111   void Append(DOMRect* aElement) { mArray.AppendElement(aElement); }
 112
 113   static DOMRectList* FromSupports(nsISupports* aSupports)
 114   {
 115 #ifdef DEBUG
 116     {
 117       nsCOMPtr<nsIDOMClientRectList> list_qi = do_QueryInterface(aSupports);
 118
 119       // If this assertion fires the QI implementation for the object in
 120       // question doesn't use the nsIDOMClientRectList pointer as the nsISupports
 121       // pointer. That must be fixed, or we'll crash...
 122       NS_ASSERTION(list_qi == static_cast<nsIDOMClientRectList*>(aSupports),
 123                    "Uh, fix QI!");
 124     }
 125 #endif
 126
 127     return static_cast<DOMRectList*>(aSupports);
 128   }
 129
 130   uint32_t Length()
 131   {
 132     return mArray.Length();
 133   }
 134   DOMRect* Item(uint32_t aIndex)
 135   {
 136     return mArray.SafeElementAt(aIndex);
 137   }
 138   DOMRect* IndexedGetter(uint32_t aIndex, bool& aFound)
 139   {
 140     aFound = aIndex < mArray.Length();
 141     if (!aFound) {
 142       return nullptr;
 143     }
 144     return mArray[aIndex];
 145   }
 146
 147 protected:
 148   virtual ~DOMRectList() {}
 149
 150   nsTArray< nsRefPtr<DOMRect> > mArray;
 151   nsCOMPtr<nsISupports> mParent;
 152 };
 153
 154 }
 155 }
 156
 157 #endif /*MOZILLA_DOMRECT_H_*/