widget/nsIPrintSettingsService.idl
author Nicholas Nethercote <nnethercote@mozilla.com>
Wed, 25 Oct 2017 10:22:38 +1100
changeset 387909 3d0093f961eec929caa370444cd0f7fcbfbc82bc
parent 385663 396ff2a152d77a0c28f09fefc8b0a96659f2d4ba
child 475057 919893dc7365431d63b09f1603a961e6e5285f20
child 475219 020c8c871c0d3b3920fe95935cfef06501976c0f
permissions -rw-r--r--
Bug 1410794 - Change some |string| occurrences in nsIPrefBranch.idl to |ACString|. r=erahm. This makes the code nicer. In particular, it removes many getter_Copies() calls. The patch also converts a lot of nsCStrings to nsAutoCString, which will avoid heap allocation in the common case. The patch also renames PREF_CopyCharPref() as PREF_GetCStringPref(), because it's actually getting a string, not a char, and that matches the existing GetCString() and GetDefaultCString() methods. Correspondingly, it also renames PREF_SetCharPref() as PREF_SetCStringPref(). The |aPrefName| arguments in nsIPrefBranch.idl remain as |string| because they almost always involve passing in C string literals, and passing "foo" is much nicer than passing NS_LITERAL_CSTRING("foo"). It's worth noting that early versions of this patch used |AUTF8String| instead of |ACString|. But it turns out that libpref stores prefs internally as Latin1. And |ACString| is compatible with Latin1 but |AUTF8String| isn't, because non-ASCII Latin1 strings are not valid UTF-8!

/* -*- Mode: C++; tab-width: 2; 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/. */

/* Interface to the Service for gwetting the Global PrintSettings object
   or a unique PrintSettings object
*/

#include "nsISupports.idl"

interface nsIPrintSettings;
interface nsIWebBrowserPrint;

%{ C++
namespace mozilla {
namespace embedding {
  class PrintData;
}
}
%}

/**
 * Native types
 */
[ref] native PrintDataRef(const mozilla::embedding::PrintData);
[ptr] native PrintDataPtr(mozilla::embedding::PrintData);

[scriptable, uuid(841387C8-72E6-484b-9296-BF6EEA80D58A)]
interface nsIPrintSettingsService : nsISupports
{
  /**
   * Returns a "global" PrintSettings object 
   * Creates a new the first time, if one doesn't exist.
   *
   * Then returns the same object each time after that.
   *
   * Initializes the globalPrintSettings from the default printer
   */
  readonly attribute nsIPrintSettings globalPrintSettings;

  /**
   * Returns a new, unique PrintSettings object each time.
   *
   * For example, if each browser was to have its own unique
   * PrintSettings, then each browser window would call this to
   * create its own unique PrintSettings object.
   *
   * If each browse window was to use the same PrintSettings object
   * then it should use "globalPrintSettings"
   *
   * Initializes the newPrintSettings from the unprefixed printer
   * (Note: this may not happen if there is an OS specific implementation.)
   *
   */
  readonly attribute nsIPrintSettings newPrintSettings;

  /**
   * The name of the last printer used, or else the system default printer.
   */
  readonly attribute AString defaultPrinterName;

  /**
   * Initializes certain settings from the native printer into the PrintSettings
   * if aPrinterName is null then it uses the default printer name if it can
   * These settings include, but are not limited to:
   *   Page Orientation
   *   Page Size
   *   Number of Copies
   */
  void initPrintSettingsFromPrinter(in AString aPrinterName,
                                    in nsIPrintSettings aPrintSettings);

  /**
   * Reads PrintSettings values from Prefs,
   * the values to be read are indicated by the "flags" arg.
   *
   * aPrintSettings should be initialized with the name of a printer. First
   * it reads in the PrintSettings from the last print job. Then it uses the
   * PrinterName in the PrinterSettings to read any settings that were saved
   * just for that printer.
   *
   * aPS - PrintSettings to have its settings read
   * aUsePrinterNamePrefix - indicates whether to use the printer name as a prefix
   * aFlags - indicates which prefs to read, see nsIPrintSettings.idl for the
   *          const values.
   *
   * Items not read:
   *   startPageRange, endPageRange, scaling, printRange, title
   *   docURL, howToEnableFrameUI, isCancelled, printFrameTypeUsage
   *   printFrameType, printSilent, shrinkToFit, numCopies,
   *   printerName
   *
   */
  void initPrintSettingsFromPrefs(in nsIPrintSettings aPrintSettings, in boolean aUsePrinterNamePrefix, in unsigned long aFlags);

  /**
   * Writes PrintSettings values to Prefs, 
   * the values to be written are indicated by the "flags" arg.
   *
   * If there is no PrinterName in the PrinterSettings 
   * the values are saved as the "generic" values not associated with any printer.
   * If a PrinterName is there, then it saves the items qualified for that Printer
   *
   * aPS - PrintSettings to have its settings saved
   * aUsePrinterNamePrefix - indicates whether to use the printer name as a prefix
   * aFlags - indicates which prefs to save, see nsIPrintSettings.idl for the const values.
   *
   * Items not written:
   *   startPageRange, endPageRange, scaling, printRange, title
   *   docURL, howToEnableFrameUI, isCancelled, printFrameTypeUsage
   *   printFrameType, printSilent, shrinkToFit, numCopies
   *
   */
  void savePrintSettingsToPrefs(in nsIPrintSettings aPrintSettings, in boolean aUsePrinterNamePrefix, in unsigned long aFlags);

  /**
   * Given some nsIPrintSettings and (optionally) an nsIWebBrowserPrint,
   * populates a PrintData representing them which can be sent over IPC. Values
   * are only ever read from aSettings and aWBP.
   *
   * @param aSettings
   *        An nsIPrintSettings for a print job.
   * @param aWBP (optional)
   *        The nsIWebBrowserPrint for the print job.
   * @param data
   *        Pointer to a pre-existing PrintData to populate.
   *
   * @return nsresult
   */
  [noscript]
  void SerializeToPrintData(in nsIPrintSettings aPrintSettings,
                            in nsIWebBrowserPrint aWebBrowserPrint,
                            in PrintDataPtr data);

  /**
   * This function is the opposite of SerializeToPrintData, in that it takes
   * a PrintData, and populates a pre-existing nsIPrintSettings with the data
   * from PrintData.
   *
   * @param PrintData
   *        Printing information sent through IPC.
   * @param settings
   *        A pre-existing nsIPrintSettings to populate with the PrintData.
   *
   * @return nsresult
   */
  [noscript]
  void DeserializeToPrintSettings(in PrintDataRef data,
                                  in nsIPrintSettings aPrintSettings);

};

%{C++
// {841387C8-72E6-484b-9296-BF6EEA80D58A}
#define NS_PRINTSETTINGSSERVICE_IID \
 {0x841387c8, 0x72e6, 0x484b, { 0x92, 0x96, 0xbf, 0x6e, 0xea, 0x80, 0xd5, 0x8a}}
%}