forked from mirrors/gecko-dev
92 lines
3.7 KiB
C++
92 lines
3.7 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef nsPrinterListBase_h__
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#define nsPrinterListBase_h__
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#include "nsIPrinterList.h"
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#include "nsCycleCollectionParticipant.h"
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#include "nsISupportsImpl.h"
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#include "nsPaper.h"
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#include "nsString.h"
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class nsPrinterListBase : public nsIPrinterList {
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public:
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using Promise = mozilla::dom::Promise;
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NS_DECL_CYCLE_COLLECTING_ISUPPORTS
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NS_DECL_CYCLE_COLLECTION_CLASS(nsPrinterListBase)
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NS_IMETHOD GetSystemDefaultPrinterName(nsAString& aName) final {
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return SystemDefaultPrinterName(aName);
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}
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NS_IMETHOD GetPrinters(JSContext*, Promise**) final;
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NS_IMETHOD GetPrinterByName(const nsAString& aPrinterName, JSContext* aCx,
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Promise** aResult) final;
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NS_IMETHOD GetPrinterBySystemName(const nsAString& aPrinterName,
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JSContext* aCx, Promise** aResult) final;
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NS_IMETHOD GetNamedOrDefaultPrinter(const nsAString& aPrinterName,
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JSContext* aCx, Promise** aResult) final;
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NS_IMETHOD GetFallbackPaperList(JSContext*, Promise**) final;
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struct PrinterInfo {
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// Both windows and CUPS: The name of the printer.
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nsString mName;
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// CUPS only: Handle to owned cups_dest_t.
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void* mCupsHandle = nullptr;
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};
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// Called off the main thread, collect information to create an appropriate
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// list of printers.
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virtual nsTArray<PrinterInfo> Printers() const = 0;
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// Create an nsIPrinter object given the information we obtained from the
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// background thread.
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virtual RefPtr<nsIPrinter> CreatePrinter(PrinterInfo) const = 0;
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mozilla::Maybe<PrinterInfo> NamedOrDefaultPrinter(nsString aName) const;
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// No copy or move, we're an identity.
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nsPrinterListBase(const nsPrinterListBase&) = delete;
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nsPrinterListBase(nsPrinterListBase&&) = delete;
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protected:
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nsPrinterListBase();
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virtual ~nsPrinterListBase();
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// This could be implemented in terms of Printers() and then searching the
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// returned printer info for a printer of the given name, but we expect
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// backends to have more efficient methods of implementing this.
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virtual mozilla::Maybe<PrinterInfo> PrinterByName(nsString aName) const = 0;
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// Same as NamedPrinter, but uses the system name.
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// Depending on whether or not there is a more efficient way to address the
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// printer for a given backend, this may or may not be equivalent to
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// NamedPrinter.
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virtual mozilla::Maybe<PrinterInfo> PrinterBySystemName(
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nsString aName) const = 0;
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// This is implemented separately from the IDL interface version so that it
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// can be made const, which allows it to be used while resolving promises.
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virtual nsresult SystemDefaultPrinterName(nsAString&) const = 0;
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// Return "paper" sizes to be supported by the Save to PDF destination;
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// for actual printer drivers the list is retrieved from nsIPrinter.
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nsTArray<RefPtr<nsPaper>> FallbackPaperList() const;
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// Constructs mCommonPaperInfo by localizing the sizes in
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// nsPaper::kCommonPaperSizes and creating corresponding PaperInfo.
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void EnsureCommonPaperInfo(JSContext* aCx);
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RefPtr<Promise> mPrintersPromise;
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// PaperInfo for our fallback sizes and common size localization.
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// This field contains the same data for every instance of this class.
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// It's unfortunate that this needs to be a member rather than static data
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// like nsPaper::kCommonPaperSizes, but that's because PaperInfo contains
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// localized data, and we need a JSContext to do the localization.
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RefPtr<const mozilla::CommonPaperInfoArray> mCommonPaperInfo;
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};
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#endif
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