зеркало из https://github.com/mozilla/gecko-dev.git
119 строки
4.1 KiB
C++
119 строки
4.1 KiB
C++
/* -*- 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/. */
|
|
|
|
/*
|
|
* rendering object that is the root of the frame tree, which contains
|
|
* the document's scrollbars and contains fixed-positioned elements
|
|
*/
|
|
|
|
#ifndef mozilla_ViewportFrame_h
|
|
#define mozilla_ViewportFrame_h
|
|
|
|
#include "mozilla/Attributes.h"
|
|
#include "nsContainerFrame.h"
|
|
|
|
class nsPresContext;
|
|
|
|
namespace mozilla {
|
|
|
|
class ServoRestyleState;
|
|
|
|
/**
|
|
* ViewportFrame is the parent of a single child - the doc root frame or a
|
|
* scroll frame containing the doc root frame. ViewportFrame stores this child
|
|
* in its primary child list.
|
|
*/
|
|
class ViewportFrame : public nsContainerFrame {
|
|
public:
|
|
NS_DECL_QUERYFRAME
|
|
NS_DECL_FRAMEARENA_HELPERS(ViewportFrame)
|
|
|
|
explicit ViewportFrame(ComputedStyle* aStyle, nsPresContext* aPresContext)
|
|
: ViewportFrame(aStyle, aPresContext, kClassID) {}
|
|
|
|
virtual ~ViewportFrame() = default; // useful for debugging
|
|
|
|
virtual void Init(nsIContent* aContent, nsContainerFrame* aParent,
|
|
nsIFrame* aPrevInFlow) override;
|
|
|
|
#ifdef DEBUG
|
|
virtual void AppendFrames(ChildListID aListID,
|
|
nsFrameList& aFrameList) override;
|
|
virtual void InsertFrames(ChildListID aListID, nsIFrame* aPrevFrame,
|
|
const nsLineList::iterator* aPrevFrameLine,
|
|
nsFrameList& aFrameList) override;
|
|
virtual void RemoveFrame(ChildListID aListID, nsIFrame* aOldFrame) override;
|
|
#endif
|
|
|
|
virtual void BuildDisplayList(nsDisplayListBuilder* aBuilder,
|
|
const nsDisplayListSet& aLists) override;
|
|
|
|
void BuildDisplayListForTopLayer(nsDisplayListBuilder* aBuilder,
|
|
nsDisplayList* aList);
|
|
|
|
virtual nscoord GetMinISize(gfxContext* aRenderingContext) override;
|
|
virtual nscoord GetPrefISize(gfxContext* aRenderingContext) override;
|
|
virtual void Reflow(nsPresContext* aPresContext, ReflowOutput& aDesiredSize,
|
|
const ReflowInput& aReflowInput,
|
|
nsReflowStatus& aStatus) override;
|
|
|
|
bool ComputeCustomOverflow(nsOverflowAreas&) override { return false; }
|
|
|
|
/**
|
|
* Adjust aReflowInput to account for scrollbars and pres shell
|
|
* GetVisualViewportSizeSet and
|
|
* GetContentDocumentFixedPositionMargins adjustments.
|
|
* @return the rect to use as containing block rect
|
|
*/
|
|
nsRect AdjustReflowInputAsContainingBlock(ReflowInput* aReflowInput) const;
|
|
|
|
/**
|
|
* Update our style (and recursively the styles of any anonymous boxes we
|
|
* might own)
|
|
*/
|
|
void UpdateStyle(ServoRestyleState& aStyleSet);
|
|
|
|
/**
|
|
* Return our single anonymous box child.
|
|
*/
|
|
void AppendDirectlyOwnedAnonBoxes(nsTArray<OwnedAnonBox>& aResult) override;
|
|
|
|
// Returns adjusted viewport size to reflect the positions that position:fixed
|
|
// elements are attached.
|
|
nsSize AdjustViewportSizeForFixedPosition(const nsRect& aViewportRect) const;
|
|
|
|
#ifdef DEBUG_FRAME_DUMP
|
|
virtual nsresult GetFrameName(nsAString& aResult) const override;
|
|
#endif
|
|
|
|
protected:
|
|
ViewportFrame(ComputedStyle* aStyle, nsPresContext* aPresContext, ClassID aID)
|
|
: nsContainerFrame(aStyle, aPresContext, aID), mView(nullptr) {}
|
|
|
|
/**
|
|
* Calculate how much room is available for fixed frames. That means
|
|
* determining if the viewport is scrollable and whether the vertical and/or
|
|
* horizontal scrollbars are visible. Adjust the computed width/height and
|
|
* available width for aReflowInput accordingly.
|
|
* @return the current scroll position, or 0,0 if not scrollable
|
|
*/
|
|
nsPoint AdjustReflowInputForScrollbars(ReflowInput* aReflowInput) const;
|
|
|
|
nsView* GetViewInternal() const override { return mView; }
|
|
void SetViewInternal(nsView* aView) override { mView = aView; }
|
|
|
|
private:
|
|
virtual mozilla::layout::FrameChildListID GetAbsoluteListID() const override {
|
|
return kFixedList;
|
|
}
|
|
|
|
nsView* mView;
|
|
};
|
|
|
|
} // namespace mozilla
|
|
|
|
#endif // mozilla_ViewportFrame_h
|