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/* -*- 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/. */
#ifndef nsPageFrame_h___
#define nsPageFrame_h___
#include "mozilla/Attributes.h"
#include "nsContainerFrame.h"
#include "nsLeafFrame.h"
class nsFontMetrics;
class nsPageContentFrame;
class nsSharedPageData;
namespace mozilla {
class PresShell;
} // namespace mozilla
// Page frame class. Represents an individual page, in paginated mode.
class nsPageFrame final : public nsContainerFrame {
public:
NS_DECL_QUERYFRAME
NS_DECL_FRAMEARENA_HELPERS(nsPageFrame)
friend nsPageFrame* NS_NewPageFrame(mozilla::PresShell* aPresShell,
ComputedStyle* aStyle);
void Reflow(nsPresContext* aPresContext, ReflowOutput& aReflowOutput,
const ReflowInput& aReflowInput,
nsReflowStatus& aStatus) override;
void BuildDisplayList(nsDisplayListBuilder* aBuilder,
const nsDisplayListSet& aLists) override;
#ifdef DEBUG_FRAME_DUMP
nsresult GetFrameName(nsAString& aResult) const override;
#endif
//////////////////
// For Printing
//////////////////
// Determine this page's page-number, based on its previous continuation
// (whose page number is presumed to already be known).
void DeterminePageNum();
int32_t GetPageNum() const { return mPageNum; }
void SetSharedPageData(nsSharedPageData* aPD);
nsSharedPageData* GetSharedPageData() const { return mPD; }
void PaintHeaderFooter(gfxContext& aRenderingContext, nsPoint aPt,
bool aSubpixelAA);
const nsMargin& GetUsedPageContentMargin() const {
return mPageContentMargin;
}
uint32_t IndexOnSheet() const { return mIndexOnSheet; }
void SetIndexOnSheet(uint32_t aIndexOnSheet) {
mIndexOnSheet = aIndexOnSheet;
}
ComputeTransformFunction GetTransformGetter() const override;
nsPageContentFrame* PageContentFrame() const;
nsSize ComputePageSize() const;
// Computes the scaling factor to fit the page to the sheet in the single
// page-per-sheet case. (The multiple pages-per-sheet case is currently
// different - see the comment for
// PrintedSheetFrame::ComputePagesPerSheetGridMetrics and code in
// ComputePagesPerSheetAndPageSizeTransform.) The page and sheet dimensions
// may be different due to a CSS page-size that gives the page a size that is
// too large to fit on the sheet that we are printing to.
float ComputeSinglePPSPageSizeScale(const nsSize aContentPageSize) const;
// The default implementation of FirstContinuation in nsSplittableFrame is
// implemented in linear time, walking back through the linked list of
// continuations via mPrevContinuation.
// For nsPageFrames, we can find the first continuation through the frame
// tree structure in constant time.
nsIFrame* FirstContinuation() const final;
protected:
explicit nsPageFrame(ComputedStyle* aStyle, nsPresContext* aPresContext);
virtual ~nsPageFrame();
typedef enum { eHeader, eFooter } nsHeaderFooterEnum;
nscoord GetXPosition(gfxContext& aRenderingContext,
nsFontMetrics& aFontMetrics, const nsRect& aRect,
int32_t aJust, const nsString& aStr);
nsReflowStatus ReflowPageContent(nsPresContext*,
const ReflowInput& aPageReflowInput);
void DrawHeaderFooter(gfxContext& aRenderingContext,
nsFontMetrics& aFontMetrics,
nsHeaderFooterEnum aHeaderFooter, int32_t aJust,
const nsString& sStr, const nsRect& aRect,
nscoord aHeight, nscoord aAscent, nscoord aWidth);
void DrawHeaderFooter(gfxContext& aRenderingContext,
nsFontMetrics& aFontMetrics,
nsHeaderFooterEnum aHeaderFooter,
const nsString& aStrLeft, const nsString& aStrRight,
const nsString& aStrCenter, const nsRect& aRect,
nscoord aAscent, nscoord aHeight);
void ProcessSpecialCodes(const nsString& aStr, nsString& aNewStr);
static constexpr int32_t kPageNumUnset = -1;
// 1-based page-num
int32_t mPageNum = kPageNumUnset;
// 0-based index on the sheet that we belong to. Unused/meaningless if this
// page has frame state bit NS_PAGE_SKIPPED_BY_CUSTOM_RANGE.
uint32_t mIndexOnSheet = 0;
// Note: this will be set before reflow, and it's strongly owned by our
// nsPageSequenceFrame, which outlives us.
nsSharedPageData* mPD = nullptr;
// Computed page content margins.
//
// This is the amount of space from the edges of the content to the edges,
// measured in the content coordinate space. This is as opposed to the
// coordinate space of the physical paper. This might be different due to
// a CSS page-size that is too large to fit on the paper, causing content to
// be scaled to fit.
//
// These margins take into account:
// * CSS-defined margins (content units)
// * User-supplied margins (physical units)
// * Unwriteable-supplied margins (physical units)
//
// When computing these margins, all physical units have the inverse of the
// scaling factor caused by CSS page-size downscaling applied. This ensures
// that even if the content will be downscaled, it will respect the (now
// upscaled) physical unwriteable margins required by the printer.
// For user-supplied margins, it isn't immediately obvious to the user what
// the intended page-size of the document is, so we consider these margins to
// be in the physical space of the paper.
nsMargin mPageContentMargin;
};
class nsPageBreakFrame final : public nsLeafFrame {
NS_DECL_FRAMEARENA_HELPERS(nsPageBreakFrame)
explicit nsPageBreakFrame(ComputedStyle* aStyle, nsPresContext* aPresContext);
~nsPageBreakFrame();
void Reflow(nsPresContext* aPresContext, ReflowOutput& aReflowOutput,
const ReflowInput& aReflowInput,
nsReflowStatus& aStatus) override;
#ifdef DEBUG_FRAME_DUMP
nsresult GetFrameName(nsAString& aResult) const override;
#endif
protected:
nscoord GetIntrinsicISize() override;
nscoord GetIntrinsicBSize() override;
friend nsIFrame* NS_NewPageBreakFrame(mozilla::PresShell* aPresShell,
ComputedStyle* aStyle);
};
#endif /* nsPageFrame_h___ */
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