Bug 1839316: part 5) Guard the "fetchpriority" attribute behind a pref. r=kershaw...

[gecko.git] / widget / nsIPrintSettings.idl

/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/* 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/. */

#include "nsISupports.idl"

%{ C++
#include "nsMargin.h"
#include "nsTArray.h"

namespace mozilla {
struct PrintSettingsInitializer;
}
%}

/**
 * Native types
 */
native nsNativeIntMargin(nsIntMargin);
[ref] native nsNativeIntMarginRef(nsIntMargin);
native PrintSettingsInitializer(mozilla::PrintSettingsInitializer);

interface nsIOutputStream;

/**
 * Simplified graphics interface for JS rendering.
 */
[scriptable, builtinclass, uuid(ecc5cbad-57fc-4731-b0bd-09e865bd62ad)]
interface nsIPrintSettings : nsISupports
{
  /**
   * PrintSettings to be Saved Navigation Constants
   */
  /* Flag 0x00000001 is unused */
  const unsigned long kInitSaveHeaderLeft     = 0x00000002;
  const unsigned long kInitSaveHeaderCenter   = 0x00000004;
  const unsigned long kInitSaveHeaderRight    = 0x00000008;
  const unsigned long kInitSaveFooterLeft     = 0x00000010;
  const unsigned long kInitSaveFooterCenter   = 0x00000020;
  const unsigned long kInitSaveFooterRight    = 0x00000040;
  const unsigned long kInitSaveBGColors       = 0x00000080;
  const unsigned long kInitSaveBGImages       = 0x00000100;
  const unsigned long kInitSavePaperSize      = 0x00000200;
  /* Flag 0x00000400 is unused */
  const unsigned long kInitSaveDuplex         = 0x00000800;
  /* Flag 0x00001000 is unused */
  /* Flag 0x00002000 is unused */
  const unsigned long kInitSaveUnwriteableMargins = 0x00004000;
  const unsigned long kInitSaveEdges          = 0x00008000;

  const unsigned long kInitSaveReversed       = 0x00010000;
  const unsigned long kInitSaveInColor        = 0x00020000;
  const unsigned long kInitSaveOrientation    = 0x00040000;

  const unsigned long kInitSavePrinterName    = 0x00100000;
  const unsigned long kInitSavePrintToFile    = 0x00200000;
  const unsigned long kInitSaveToFileName     = 0x00400000;
  const unsigned long kInitSavePageDelay      = 0x00800000;
  const unsigned long kInitSaveMargins        = 0x01000000;
  /* Flag 0x02000000 is unused */

  const unsigned long kInitSaveShrinkToFit    = 0x08000000;
  const unsigned long kInitSaveScaling        = 0x10000000;

  const unsigned long kInitSaveAll            = 0xFFFFFFFF;

  // These settings should be read from global prefs. Other settings should be
  // read only from printer-specific prefs.
  const unsigned long kGlobalSettings =
      kInitSaveHeaderLeft | kInitSaveHeaderCenter | kInitSaveHeaderRight |
      kInitSaveFooterLeft | kInitSaveFooterCenter | kInitSaveFooterRight |
      kInitSaveEdges | kInitSaveReversed | kInitSaveInColor |
      kInitSaveBGColors | kInitSaveBGImages | kInitSaveShrinkToFit;

  // These settings may be changed by native print dialog and should be
  // persisted when changed.
  const unsigned long kPrintDialogPersistSettings =
      kGlobalSettings | kInitSavePaperSize | kInitSaveDuplex |
      kInitSaveEdges | kInitSaveReversed | kInitSaveInColor |
      kInitSaveOrientation | kInitSavePageDelay | kInitSaveMargins |
      kInitSaveShrinkToFit | kInitSaveScaling;

  /* Justification Enums */
  const long kJustLeft   = 0;
  const long kJustCenter = 1;
  const long kJustRight  = 2;

  /** Page Size Unit Constants */
  const short kPaperSizeInches      = 0;
  const short kPaperSizeMillimeters = 1;

  /** Orientation Constants */
  const short kPortraitOrientation  = 0;
  const short kLandscapeOrientation = 1;

  /** Output file format */
  const short kOutputFormatNative = 0;
  const short kOutputFormatPDF    = 2;

  /** Output destination */
  cenum OutputDestinationType : 8 {
    kOutputDestinationPrinter = 0,
    kOutputDestinationFile = 1,
    kOutputDestinationStream = 2,
  };

  /**
   * Duplex printing options.
   *
   * Note that other libraries refer to equivalent duplex settings using
   * various sets of terminology. This can be confusing and inconsistent both
   * with other libraries, and with the behavior that these terms intend to describe.
   *
   * kDuplexNone is equivalent to Simplex. Thankfully, both of these terms are
   * consistent with the behavior that they describe, which is to have single-sided
   * printing per sheet.
   *
   * kDuplexFlipOnLongEdge is equivalent to the following platform-specific constants:
   *   CUPS/macOS: NoTumble
   *      Windows: DMDUP_VERTICAL
   *          GTK: GTK_PRINT_DUPLEX_HORIZONTAL
   *
   * kDuplexFlipOnShortEdge is equivalent to the following platform-specific constants:
   *   CUPS/macOS: Tumble
   *      Windows: DMDUP_HORIZONTAL
   *          GTK: GTK_PRINT_DUPLEX_VERTICAL
   *
   *
   * Notice that the GTK and Windows constants have opposite meanings for
   * VERTICAL and HORIZONTAL.
   *
   * To make matters more confusing, these platform-specific terms describe different
   * behavior (from the user's perspective) depending on whether the sheet is in
   * portrait vs. landscape orientation.
   *
   * For example, the generic term "tumble" describes behavior where a sheet flips over
   * a binding on the top edge (like a calendar). This requires that the back side of
   * the sheet is printed upside down with respect to the front side of the sheet,
   * so that its content appears upright to the reader when they tumble-flip the
   * sheet over the top-edge binding.
   *
   * However, the CUPS/macOS Tumble setting only inverts the back side of the
   * sheet in portrait orientation. When you switch to landscape orientation, the
   * Tumble setting behaves like a book-like sheet flip, where the front and back
   * sides of the sheet are both printed upright with respect to each other.
   *
   * This is why it is more consistent and more clear to think of these terms
   * with regard to sheets being bound on the long edge or the short edge.
   *
   * kDuplexFlipOnLongEdge  + Portrait  =     book-like flip (front/back same direction)
   * kDuplexFlipOnLongEdge  + Landscape = calendar-like flip (front/back inverted)
   *
   * kDuplexFlipOnShortEdge + Portrait  = calendar-like flip (front/back inverted)
   * kDuplexFlipOnShortEdge + Landscape =     book-like flip (front/back same direction)
   *
   * The long-edge and short-edge terminology unfortunately breaks down when printing
   * with square sheet dimensions. Thankfully this edge case (hah) is quite uncommon,
   * since most standard printing paper dimensions are not square. Such a paper size
   * would even break the uniformly used portrait and landscape terminology.
   */
  const short kDuplexNone = 0;
  const short kDuplexFlipOnLongEdge = 1;
  const short kDuplexFlipOnShortEdge = 2;

  /**
   * Get the page size in twips, considering the
   * orientation (portrait or landscape).
   */
  void GetEffectivePageSize(out double aWidth, out double aHeight);

  /**
   * Get the printed sheet size in twips, considering both the user-specified
   * orientation (portrait or landscape) *as well as* the fact that we might be
   * inverting the orientation to account for 2 or 6 pages-per-sheet.
   *
   * This API will usually behave the same (& return the same thing) as
   * GetEffectivePageSize, *except for* when we are printing with 2 or 6
   * pages-per-sheet, in which case the return values (aWidth & aHeight) will
   * be swapped with respect to what GetEffectivePageSize would return.
   *
   * Callers should use this method rather than GetEffectivePageSize when they
   * really do want the size of the sheet of paper to be printed, rather than
   * the possibly-"virtualized"-via-pages-per-sheet page size.
   */
  [noscript, notxpcom, nostdcall] void GetEffectiveSheetSize(out double aWidth,
                                                             out double aHeight);

  /**
   * Get the orientation of a printed sheet. This is usually the same as the
   * 'orientation' attribute (which is the orientation of individual pages),
   * except when we're printing with 2 or 6 pages-per-sheet, in which case
   * it'll be the opposite value.
   *
   * Note that this value is not independently settable. Its value is fully
   * determined by the 'orientation' and 'numPagesPerSheet' attributes.
   */
  [noscript, notxpcom, nostdcall] long GetSheetOrientation();

  /**
   * Convenience getter, which returns true IFF the sheet orientation and the
   * page orientation are orthogonal. (In other words, returns true IFF we
   * are printing with 2 or 6 pages-per-sheet.)
   */
  [noscript, notxpcom, nostdcall] bool HasOrthogonalSheetsAndPages();

  /**
   * Makes a new copy
   */
  nsIPrintSettings clone();

  /**
   * Assigns the internal values from the "in" arg to the current object
   */
  void assign(in nsIPrintSettings aPS);

  /**
   * Returns true if the settings will result in an equivalent preview and
   * therefore print. The printer name is ignored and it allows for a small
   * delta in sizes to allow for rounding differences.
   */
  bool equivalentTo(in nsIPrintSettings aPrintSettings);

  /**
   * The edge measurements define the positioning of the headers
   * and footers on the page. They're treated as an offset from the edges of
   * the page, but are forced to be at least the "unwriteable margin"
   * (described below).
   */
  attribute double  edgeTop;     /*  these are in inches */
  attribute double  edgeLeft;
  attribute double  edgeBottom;
  attribute double  edgeRight;

  /**
   * The margins define the positioning of the content on the page.
   * and footers on the page. They're treated as an offset from the edges of
   * the page, but are forced to be at least the "unwriteable margin," unless
   * set to be ignored (described below).
   */
  attribute double  marginTop;     /*  these are in inches */
  attribute double  marginLeft;
  attribute double  marginBottom;
  attribute double  marginRight;
  /**
   * The unwriteable margin defines the printable region of the paper.
   */
  attribute double  unwriteableMarginTop;     /*  these are in inches */
  attribute double  unwriteableMarginLeft;
  attribute double  unwriteableMarginBottom;
  attribute double  unwriteableMarginRight;

  attribute double  scaling;      /* values 0.0 - 1.0 */
  [infallible] attribute boolean printBGColors; /* Print Background Colors */
  [infallible] attribute boolean printBGImages; /* Print Background Images */

  /**
   * Whether @page rule margins should be honored or not. If the @page
   * rule sets its margins to zero, we automatically ignore unwriteable
   * margins, but nonzero values will be clamped to unwriteable margins.
   */
  [infallible] attribute boolean honorPageRuleMargins;

  /**
   * Whether @page rule size should be used for the output paper size.
   */
  [infallible] attribute boolean usePageRuleSizeAsPaperSize;

  /**
   * Whether unwritable margins should be ignored. This should be set when
   * when the user explicitly requests "Margins: None", e.g. for documents
   * where accurate scaling matters. Note: While `honorPageRuleMargins` and
   * this flag can't be set at the same time through the UI, doing so will
   * cause even the nonzero @page rule margins to ignore unwriteable margins.
   */
  [infallible] attribute boolean ignoreUnwriteableMargins;

  /** Whether to draw guidelines showing the margin settings */
  [infallible] attribute boolean showMarginGuides;

  /** Whether to only print the selected nodes */
  [infallible] attribute boolean printSelectionOnly;

  attribute AString title;
  attribute AString docURL;

  attribute AString headerStrLeft;
  attribute AString headerStrCenter;
  attribute AString headerStrRight;

  attribute AString footerStrLeft;
  attribute AString footerStrCenter;
  attribute AString footerStrRight;

  attribute boolean printSilent;         /* print without putting up the dialog */
  [infallible] attribute boolean shrinkToFit; /* shrinks content to fit on page */

  /* Additional XP Related */
  attribute AString paperId;       /* identifier of paper (not display name) */
  attribute double  paperWidth;    /* width of the paper in inches or mm */
  attribute double  paperHeight;   /* height of the paper in inches or mm */
  attribute short   paperSizeUnit; /* paper is in inches or mm */

  attribute boolean printReversed;
  [infallible] attribute boolean printInColor;  /* a false means grayscale */
  attribute long    orientation;   /*  see orientation consts */
  attribute long    numCopies;

  /**
   * For numPagesPerSheet, we support these values: 1, 2, 4, 6, 9, 16.
   *
   * Unsupported values will be treated internally as 1 page per sheet, and
   * will trigger assertion failures in debug builds.
   */
  attribute long    numPagesPerSheet;

  /** Output device information */
  [infallible] attribute nsIPrintSettings_OutputDestinationType outputDestination;
  [infallible] attribute short outputFormat;

  /**
   * If outputDestination==kOutputDestinationPrinter, this is set to the name
   * of the printer that the print output should be saved to, but only in the
   * parent process (we don't want to leak printer names to potentially
   * compromised content processes).
   */
  attribute AString printerName;

  /**
   * If outputDestination==kOutputDestinationFile, this is set to the path
   * of the file that the print output should be saved to, but only in the
   * parent process (we don't want to leak system paths to potentially
   * compromised content processes).
   */
  attribute AString toFileName;

  attribute nsIOutputStream outputStream; /* for kOutputDestinationPrinter */

  [infallible] attribute long printPageDelay; /* in milliseconds */

  [infallible] attribute long resolution;     /* print resolution (dpi) */

  [infallible] attribute long duplex;         /* duplex mode */

  /* initialize helpers */
  /**
   * This attribute tracks whether the PS has been initialized
   * from a printer specified by the "printerName" attr.
   * If a different name is set into the "printerName"
   * attribute than the one it was initialized with the PS
   * will then get initialized from that printer.
   */
  attribute boolean isInitializedFromPrinter;

  /**
   * This attribute tracks whether the PS has been initialized
   * from prefs. If a different name is set into the "printerName"
   * attribute than the one it was initialized with the PS
   * will then get initialized from prefs again.
   */
  attribute boolean isInitializedFromPrefs;

  /* C++ Helper Functions */
  [noscript] void SetMarginInTwips(in nsNativeIntMarginRef aMargin);
  [noscript] void SetEdgeInTwips(in nsNativeIntMarginRef aEdge);
  [noscript, notxpcom, nostdcall] nsNativeIntMargin GetMarginInTwips();
  [noscript, notxpcom, nostdcall] nsNativeIntMargin GetEdgeInTwips();

  /**
   * Sets/Gets the "unwriteable margin" for the page format.  This defines
   * the boundary from which we'll measure the EdgeInTwips and MarginInTwips
   * attributes, to place the headers and content, respectively.
   *
   * Note: Implementations of SetUnwriteableMarginInTwips should handle
   * negative margin values by falling back on the system default for
   * that margin.
   */
  [noscript] void SetUnwriteableMarginInTwips(in nsNativeIntMarginRef aEdge);
  [noscript, notxpcom, nostdcall] nsNativeIntMargin GetUnwriteableMarginInTwips();

  /**
   * Get more accurate print ranges from the superior interval
   * (startPageRange, endPageRange). The aPages array is populated with a
   * list of pairs (start, end), where the endpoints are included. The print
   * ranges (start, end), must not overlap and must be in the
   * (startPageRange, endPageRange) scope.
   *
   * If there are no print ranges the aPages array is empty.
   */
  attribute Array<long> pageRanges;

  /**
   * Get a PrintSettingsInitializer populated with the relevant current settings.
   */
  [notxpcom, nostdcall] PrintSettingsInitializer getSettingsInitializer();

%{C++
  static bool IsPageSkipped(int32_t aPageNum, const nsTArray<int32_t>& aRanges);
%}
};

%{ C++
already_AddRefed<nsIPrintSettings> CreatePlatformPrintSettings(const mozilla::PrintSettingsInitializer&);
%}