import FIREFOX_52_6_0esr_RELEASE from mozilla-esr52 hg repo

layout/generic/nsImageMap.h

@@ -0,0 +1,97 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* 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/. */
+
+/* code for HTML client-side image maps */
+
+#ifndef nsImageMap_h
+#define nsImageMap_h
+
+#include "mozilla/gfx/2D.h"
+#include "nsCOMPtr.h"
+#include "nsCoord.h"
+#include "nsTArray.h"
+#include "nsStubMutationObserver.h"
+#include "nsIDOMEventListener.h"
+
+class Area;
+class nsImageFrame;
+class nsIFrame;
+class nsIContent;
+struct nsRect;
+
+class nsImageMap final : public nsStubMutationObserver,
+                         public nsIDOMEventListener
+{
+  typedef mozilla::gfx::DrawTarget DrawTarget;
+  typedef mozilla::gfx::ColorPattern ColorPattern;
+  typedef mozilla::gfx::StrokeOptions StrokeOptions;
+
+public:
+  nsImageMap();
+
+  nsresult Init(nsImageFrame* aImageFrame, nsIContent* aMap);
+
+  /**
+   * Return the first area element (in content order) for the given aX,aY pixel
+   * coordinate or nullptr if the coordinate is outside all areas.
+   */
+  nsIContent* GetArea(nscoord aX, nscoord aY) const;
+
+  /**
+   * Return area elements count associated with the image map.
+   */
+  uint32_t AreaCount() const { return mAreas.Length(); }
+
+  /**
+   * Return area element at the given index.
+   */
+  nsIContent* GetAreaAt(uint32_t aIndex) const;
+
+  void Draw(nsIFrame* aFrame, DrawTarget& aDrawTarget,
+            const ColorPattern& aColor,
+            const StrokeOptions& aStrokeOptions = StrokeOptions());
+  
+  /** 
+   * Called just before the nsImageFrame releases us. 
+   * Used to break the cycle caused by the DOM listener.
+   */
+  void Destroy();
+  
+  // nsISupports
+  NS_DECL_ISUPPORTS
+
+  // nsIMutationObserver
+  NS_DECL_NSIMUTATIONOBSERVER_ATTRIBUTECHANGED
+  NS_DECL_NSIMUTATIONOBSERVER_CONTENTAPPENDED
+  NS_DECL_NSIMUTATIONOBSERVER_CONTENTINSERTED
+  NS_DECL_NSIMUTATIONOBSERVER_CONTENTREMOVED
+  NS_DECL_NSIMUTATIONOBSERVER_PARENTCHAINCHANGED  
+
+  //nsIDOMEventListener
+  NS_DECL_NSIDOMEVENTLISTENER
+
+  nsresult GetBoundsForAreaContent(nsIContent *aContent,
+                                   nsRect& aBounds);
+
+protected:
+  virtual ~nsImageMap();
+
+  void FreeAreas();
+
+  nsresult UpdateAreas();
+  nsresult SearchForAreas(nsIContent* aParent, bool& aFoundArea,
+                          bool& aFoundAnchor);
+
+  nsresult AddArea(nsIContent* aArea);
+ 
+  void MaybeUpdateAreas(nsIContent *aContent);
+
+  nsImageFrame* mImageFrame;  // the frame that owns us
+  nsCOMPtr<nsIContent> mMap;
+  AutoTArray<Area*, 8> mAreas; // almost always has some entries
+  bool mContainsBlockContents;
+};
+
+#endif /* nsImageMap_h */