1 files changed, 114 insertions, 0 deletions
diff --git a/widget/nsPrinterBase.h b/widget/nsPrinterBase.h
new file mode 100644
index 0000000000..abd4f82705
--- /dev/null
+++ b/widget/nsPrinterBase.h
@@ -0,0 +1,114 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* 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 nsPrinterBase_h__
+#define nsPrinterBase_h__
+
+#include "mozilla/gfx/Rect.h"
+#include "nsIPrinter.h"
+#include "nsTArray.h"
+#include "nsCycleCollectionParticipant.h"
+#include "nsISupportsImpl.h"
+#include "nsPrintSettingsImpl.h"
+#include "mozilla/EnumeratedArray.h"
+#include "mozilla/Result.h"
+
+namespace mozilla {
+
+struct PaperInfo;
+
+namespace dom {
+class Promise;
+}
+
+}  // namespace mozilla
+
+class nsPrinterBase : public nsIPrinter {
+ public:
+  using Promise = mozilla::dom::Promise;
+  using MarginDouble = mozilla::gfx::MarginDouble;
+  using PrintSettingsInitializer = mozilla::PrintSettingsInitializer;
+
+  NS_IMETHOD CopyFromWithValidation(nsIPrintSettings*, JSContext*,
+                                    Promise**) override;
+  NS_IMETHOD GetSupportsDuplex(JSContext*, Promise**) final;
+  NS_IMETHOD GetSupportsColor(JSContext*, Promise**) final;
+  NS_IMETHOD GetSupportsMonochrome(JSContext*, Promise**) final;
+  NS_IMETHOD GetSupportsCollation(JSContext*, Promise**) final;
+  NS_IMETHOD GetPrinterInfo(JSContext*, Promise**) final;
+
+  NS_DECL_CYCLE_COLLECTING_ISUPPORTS
+  NS_DECL_CYCLE_COLLECTION_CLASS(nsPrinterBase)
+
+  // We require the paper info array
+  nsPrinterBase() = delete;
+
+  // No copy or move, we're an identity.
+  nsPrinterBase(const nsPrinterBase&) = delete;
+  nsPrinterBase(nsPrinterBase&&) = delete;
+
+  void QueryMarginsForPaper(Promise&, const nsString& aPaperId);
+
+  /**
+   * Caches the argument by copying it into mPrintSettingsInitializer.
+   * If mPrintSettingsInitializer is already populated this is a no-op.
+   */
+  void CachePrintSettingsInitializer(
+      const PrintSettingsInitializer& aInitializer);
+
+  // Data to pass through to create the nsPrinterInfo
+  struct PrinterInfo {
+    nsTArray<mozilla::PaperInfo> mPaperList;
+    PrintSettingsInitializer mDefaultSettings;
+  };
+
+ private:
+  enum class AsyncAttribute {
+    // If you change this list you must update attributeKeys in
+    // nsPrinterBase::AsyncPromiseAttributeGetter.
+    SupportsDuplex = 0,
+    SupportsColor,
+    SupportsMonochrome,
+    SupportsCollation,
+    PrinterInfo,
+    // Just a guard.
+    Last,
+  };
+
+  template <typename Result, typename... Args>
+  using BackgroundTask = Result (nsPrinterBase::*)(Args...) const;
+
+  // Resolves an async attribute via a background task.
+  template <typename T, typename... Args>
+  nsresult AsyncPromiseAttributeGetter(JSContext*, Promise**, AsyncAttribute,
+                                       BackgroundTask<T, Args...>,
+                                       Args... aArgs);
+
+ protected:
+  nsPrinterBase(const mozilla::CommonPaperInfoArray* aPaperInfoArray);
+  virtual ~nsPrinterBase();
+
+  // Implementation-specific methods. These must not make assumptions about
+  // which thread they run on.
+  virtual bool SupportsDuplex() const = 0;
+  virtual bool SupportsColor() const = 0;
+  virtual bool SupportsMonochrome() const = 0;
+  virtual bool SupportsCollation() const = 0;
+  virtual MarginDouble GetMarginsForPaper(nsString aPaperId) const = 0;
+  virtual PrinterInfo CreatePrinterInfo() const = 0;
+  // Searches our built-in list of commonly used PWG paper sizes for a matching,
+  // localized PaperInfo. Returns null if there is no matching size.
+  const mozilla::PaperInfo* FindCommonPaperSize(
+      const mozilla::gfx::SizeDouble& aSize) const;
+
+ private:
+  mozilla::EnumeratedArray<AsyncAttribute, AsyncAttribute::Last,
+                           RefPtr<Promise>>
+      mAsyncAttributePromises;
+  // List of built-in, commonly used paper sizes.
+  const RefPtr<const mozilla::CommonPaperInfoArray> mCommonPaperInfo;
+};
+
+#endif