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6a75c30a0e
We only need to fall back if an area element has focus currently, which is rather uncommon. Differential Revision: https://phabricator.services.mozilla.com/D241209
114 lines
3.2 KiB
C++
114 lines
3.2 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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/* code for HTML client-side image maps */
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#ifndef nsImageMap_h
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#define nsImageMap_h
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#include "mozilla/gfx/2D.h"
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#include "nsCOMPtr.h"
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#include "nsCoord.h"
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#include "nsTArray.h"
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#include "nsStubMutationObserver.h"
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#include "nsIDOMEventListener.h"
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#include "Units.h"
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class Area;
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class nsImageFrame;
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class nsIFrame;
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class nsIContent;
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struct nsRect;
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namespace mozilla {
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namespace dom {
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class HTMLAreaElement;
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}
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} // namespace mozilla
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class nsImageMap final : public nsStubMutationObserver,
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public nsIDOMEventListener {
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typedef mozilla::gfx::DrawTarget DrawTarget;
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typedef mozilla::gfx::ColorPattern ColorPattern;
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typedef mozilla::gfx::StrokeOptions StrokeOptions;
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public:
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nsImageMap();
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void Init(nsImageFrame* aImageFrame, nsIContent* aMap);
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/**
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* Return the first area element (in content order) for the given point in
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* CSS pixel coordinate or nullptr if the coordinate is outside all areas.
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*/
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mozilla::dom::HTMLAreaElement* GetArea(const mozilla::CSSIntPoint& aPt) const;
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// Return area elements count associated with the image map.
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uint32_t AreaCount() const { return mAreas.Length(); }
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// Returns whether any of our area elements have focus, currently.
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bool HasFocus() const { return mHasFocus; }
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// Return area element at the given index.
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mozilla::dom::HTMLAreaElement* GetAreaAt(uint32_t aIndex) const;
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void DrawFocus(nsIFrame* aFrame, DrawTarget& aDrawTarget,
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const ColorPattern& aColor,
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const StrokeOptions& aStrokeOptions = StrokeOptions());
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/**
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* Called just before the nsImageFrame releases us.
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* Used to break the cycle caused by the DOM listener.
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*/
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void Destroy();
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// nsISupports
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NS_DECL_ISUPPORTS
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// nsIMutationObserver
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NS_DECL_NSIMUTATIONOBSERVER_ATTRIBUTECHANGED
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NS_DECL_NSIMUTATIONOBSERVER_CONTENTAPPENDED
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NS_DECL_NSIMUTATIONOBSERVER_CONTENTINSERTED
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NS_DECL_NSIMUTATIONOBSERVER_CONTENTREMOVED
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NS_DECL_NSIMUTATIONOBSERVER_PARENTCHAINCHANGED
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// nsIDOMEventListener
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NS_DECL_NSIDOMEVENTLISTENER
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nsresult GetBoundsForAreaContent(nsIContent* aContent, nsRect& aBounds);
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using AreaList = AutoTArray<mozilla::UniquePtr<Area>, 8>;
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protected:
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virtual ~nsImageMap();
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void FreeAreas();
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void UpdateAreas();
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void SearchForAreas(nsIContent* aParent);
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void AddArea(mozilla::dom::HTMLAreaElement* aArea);
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void AreaRemoved(mozilla::dom::HTMLAreaElement* aArea);
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void MaybeUpdateAreas(nsIContent* aContent);
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nsImageFrame* mImageFrame = nullptr; // the frame that owns us
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nsCOMPtr<nsIContent> mMap;
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// almost always has some entries
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AreaList mAreas;
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// This is set when we search for all area children and tells us whether we
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// should consider the whole subtree or just direct children when we get
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// content notifications about changes inside the map subtree.
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bool mConsiderWholeSubtree = false;
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// Whether any of our areas has focus.
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bool mHasFocus = false;
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};
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#endif /* nsImageMap_h */
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