tor-browser

The Tor Browser
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nsCanvasFrame.h (3769B)

      1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
      2 /* vim: set ts=8 sts=2 et sw=2 tw=80: */
      3 /* This Source Code Form is subject to the terms of the Mozilla Public
      4 * License, v. 2.0. If a copy of the MPL was not distributed with this
      5 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
      6 
      7 /* rendering object that goes directly inside the document's scrollbars */
      8 
      9 #ifndef nsCanvasFrame_h___
     10 #define nsCanvasFrame_h___
     11 
     12 #include "mozilla/EventForwards.h"
     13 #include "nsContainerFrame.h"
     14 #include "nsDisplayList.h"
     15 #include "nsIAnonymousContentCreator.h"
     16 #include "nsIPopupContainer.h"
     17 
     18 class nsPresContext;
     19 class gfxContext;
     20 
     21 /**
     22 * Root frame class.
     23 *
     24 * The root frame is the parent frame for the document element's frame.
     25 * It only supports having a single child frame which must be an area
     26 * frame.
     27 * @note nsCanvasFrame keeps overflow container continuations of its child
     28 * frame in the main child list.
     29 */
     30 class nsCanvasFrame final : public nsContainerFrame,
     31                            public nsIAnonymousContentCreator,
     32                            public nsIPopupContainer {
     33  using Element = mozilla::dom::Element;
     34 
     35 public:
     36  explicit nsCanvasFrame(ComputedStyle* aStyle, nsPresContext* aPresContext)
     37      : nsContainerFrame(aStyle, aPresContext, kClassID) {}
     38 
     39  NS_DECL_QUERYFRAME
     40  NS_DECL_FRAMEARENA_HELPERS(nsCanvasFrame)
     41 
     42  Element* GetDefaultTooltip() override;
     43 
     44  void Destroy(DestroyContext&) override;
     45 
     46  void SetInitialChildList(ChildListID aListID,
     47                           nsFrameList&& aChildList) override;
     48  void AppendFrames(ChildListID aListID, nsFrameList&& aFrameList) override;
     49  void InsertFrames(ChildListID aListID, nsIFrame* aPrevFrame,
     50                    const nsLineList::iterator* aPrevFrameLine,
     51                    nsFrameList&& aFrameList) override;
     52 #ifdef DEBUG
     53  void RemoveFrame(DestroyContext&, ChildListID, nsIFrame*) override;
     54 #endif
     55 
     56  nscoord IntrinsicISize(const mozilla::IntrinsicSizeInput& aInput,
     57                         mozilla::IntrinsicISizeType aType) override;
     58 
     59  void Reflow(nsPresContext* aPresContext, ReflowOutput& aDesiredSize,
     60              const ReflowInput& aReflowInput,
     61              nsReflowStatus& aStatus) override;
     62 
     63  // nsIAnonymousContentCreator
     64  nsresult CreateAnonymousContent(nsTArray<ContentInfo>& aElements) override;
     65  void AppendAnonymousContentTo(nsTArray<nsIContent*>& aElements,
     66                                uint32_t aFilter) override;
     67 
     68  void BuildDisplayList(nsDisplayListBuilder* aBuilder,
     69                        const nsDisplayListSet& aLists) override;
     70 #ifdef DEBUG_FRAME_DUMP
     71  nsresult GetFrameName(nsAString& aResult) const override;
     72 #endif
     73  nsIContent* GetContentForEvent(const mozilla::WidgetEvent*) const override;
     74  nsRect CanvasArea() const;
     75 
     76 protected:
     77  nsCOMPtr<Element> mTooltipContent;
     78 };
     79 
     80 namespace mozilla {
     81 
     82 class nsDisplayCanvasBackgroundImage final : public nsDisplayBackgroundImage {
     83 public:
     84  explicit nsDisplayCanvasBackgroundImage(nsDisplayListBuilder* aBuilder,
     85                                          nsIFrame* aFrame,
     86                                          const InitData& aInitData)
     87      : nsDisplayBackgroundImage(aBuilder, aFrame, aInitData) {}
     88 
     89  void Paint(nsDisplayListBuilder* aBuilder, gfxContext* aCtx) override;
     90 
     91  // We still need to paint a background color as well as an image for this
     92  // item, so we can't support this yet.
     93  bool SupportsOptimizingToImage() const override { return false; }
     94 
     95  bool IsSingleFixedPositionImage(nsDisplayListBuilder* aBuilder,
     96                                  const nsRect& aClipRect, gfxRect* aDestRect);
     97 
     98  NS_DISPLAY_DECL_NAME("CanvasBackgroundImage", TYPE_CANVAS_BACKGROUND_IMAGE)
     99 };
    100 
    101 }  // namespace mozilla
    102 
    103 #endif /* nsCanvasFrame_h___ */