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-rw-r--r--layout/generic/nsPageFrame.h172
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diff --git a/layout/generic/nsPageFrame.h b/layout/generic/nsPageFrame.h
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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___ */