117 lines
5.4 KiB
C++
117 lines
5.4 KiB
C++
/*
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* Copyright (C) 2007 Alp Toker <alp@atoker.com>
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* Copyright (C) 2007 Apple Inc.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public License
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* along with this library; see the file COPYING.LIB. If not, write to
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* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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*/
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#pragma once
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#include "FrameDestructionObserver.h"
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#include "LengthBox.h"
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#include <wtf/Forward.h>
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#include <wtf/HashMap.h>
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#include <wtf/Vector.h>
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#include <wtf/text/WTFString.h>
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namespace WebCore {
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class Document;
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class Element;
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class Frame;
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class FloatRect;
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class FloatSize;
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class GraphicsContext;
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class IntRect;
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class Node;
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class PrintContext : public FrameDestructionObserver {
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WTF_MAKE_FAST_ALLOCATED;
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public:
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WEBCORE_EXPORT explicit PrintContext(Frame*);
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WEBCORE_EXPORT ~PrintContext();
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// Break up a page into rects without relayout.
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// FIXME: This means that CSS page breaks won't be on page boundary if the size is different than what was passed to begin(). That's probably not always desirable.
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// FIXME: Header and footer height should be applied before layout, not after.
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// FIXME: The printRect argument is only used to determine page aspect ratio, it would be better to pass a FloatSize with page dimensions instead.
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WEBCORE_EXPORT void computePageRects(const FloatRect& printRect, float headerHeight, float footerHeight, float userScaleFactor, float& outPageHeight, bool allowHorizontalTiling = false);
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// Deprecated. Page size computation is already in this class, clients shouldn't be copying it.
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WEBCORE_EXPORT void computePageRectsWithPageSize(const FloatSize& pageSizeInPixels, bool allowHorizontalTiling);
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// These are only valid after page rects are computed.
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size_t pageCount() const { return m_pageRects.size(); }
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const IntRect& pageRect(size_t pageNumber) const { return m_pageRects[pageNumber]; }
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const Vector<IntRect>& pageRects() const { return m_pageRects; }
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WEBCORE_EXPORT FloatBoxExtent computedPageMargin(FloatBoxExtent printMargin);
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WEBCORE_EXPORT FloatSize computedPageSize(FloatSize pageSize, FloatBoxExtent printMargin);
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WEBCORE_EXPORT float computeAutomaticScaleFactor(const FloatSize& availablePaperSize);
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// Enter print mode, updating layout for new page size.
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// This function can be called multiple times to apply new print options without going back to screen mode.
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WEBCORE_EXPORT void begin(float width, float height = 0);
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// FIXME: eliminate width argument.
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WEBCORE_EXPORT void spoolPage(GraphicsContext& ctx, int pageNumber, float width);
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WEBCORE_EXPORT void spoolRect(GraphicsContext& ctx, const IntRect&);
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// Return to screen mode.
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WEBCORE_EXPORT void end();
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// Used by layout tests.
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WEBCORE_EXPORT static int pageNumberForElement(Element*, const FloatSize& pageSizeInPixels); // Returns -1 if page isn't found.
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WEBCORE_EXPORT static String pageProperty(Frame*, const char* propertyName, int pageNumber);
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WEBCORE_EXPORT static bool isPageBoxVisible(Frame*, int pageNumber);
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WEBCORE_EXPORT static String pageSizeAndMarginsInPixels(Frame*, int pageNumber, int width, int height, int marginTop, int marginRight, int marginBottom, int marginLeft);
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WEBCORE_EXPORT static int numberOfPages(Frame&, const FloatSize& pageSizeInPixels);
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// Draw all pages into a graphics context with lines which mean page boundaries.
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// The height of the graphics context should be
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// (pageSizeInPixels.height() + 1) * number-of-pages - 1
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WEBCORE_EXPORT static void spoolAllPagesWithBoundaries(Frame&, GraphicsContext&, const FloatSize& pageSizeInPixels);
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// By imaging to a width a little wider than the available pixels,
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// thin pages will be scaled down a little, matching the way they
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// print in IE and Camino. This lets them use fewer sheets than they
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// would otherwise, which is presumably why other browsers do this.
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// Wide pages will be scaled down more than this.
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static constexpr float minimumShrinkFactor() { return 1.25; }
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// This number determines how small we are willing to reduce the page content
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// in order to accommodate the widest line. If the page would have to be
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// reduced smaller to make the widest line fit, we just clip instead (this
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// behavior matches MacIE and Mozilla, at least)
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static constexpr float maximumShrinkFactor() { return 2; }
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protected:
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Vector<IntRect> m_pageRects;
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private:
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void computePageRectsWithPageSizeInternal(const FloatSize& pageSizeInPixels, bool allowHorizontalTiling);
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bool beginAndComputePageRectsWithPageSize(Frame&, const FloatSize& pageSizeInPixels);
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void collectLinkedDestinations(Document&);
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void outputLinkedDestinations(GraphicsContext&, Document&, const IntRect& pageRect);
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// Used to prevent misuses of begin() and end() (e.g., call end without begin).
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bool m_isPrinting { false };
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std::unique_ptr<HashMap<String, Ref<Element>>> m_linkedDestinations;
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};
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} // namespace WebCore
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