gecko-dev/widget/nsIDeviceContextSpec.h

/* -*- Mode: C++; tab-width: 2; 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 nsIDeviceContextSpec_h___
#define nsIDeviceContextSpec_h___

#include "nsISupports.h"

class nsIWidget;
class nsIPrintSettings;
class gfxASurface;

namespace mozilla {
namespace gfx{
class DrawEventRecorder;
}
}

#define NS_IDEVICE_CONTEXT_SPEC_IID   \
{ 0xf407cfba, 0xbe28, 0x46c9, \
  { 0x8a, 0xba, 0x04, 0x2d, 0xae, 0xbb, 0x4f, 0x23 } }

class nsIDeviceContextSpec : public nsISupports
{
public:
   NS_DECLARE_STATIC_IID_ACCESSOR(NS_IDEVICE_CONTEXT_SPEC_IID)

   /**
    * Initialize the device context spec.
    * @param aWidget         A widget a dialog can be hosted in
    * @param aPrintSettings  Print settings for the print operation
    * @param aIsPrintPreview True if creating Spec for PrintPreview
    * @return NS_OK or a suitable error code.
    */
   NS_IMETHOD Init(nsIWidget *aWidget,
                   nsIPrintSettings* aPrintSettings,
                   bool aIsPrintPreview) = 0;

   NS_IMETHOD GetSurfaceForPrinter(gfxASurface **nativeSurface) = 0;

   /**
    * If required override to return a recorder to record the print.
    *
    * @param aDrawEventRecorder out param for the recorder to use
    * @return NS_OK or a suitable error code
    */
   NS_IMETHOD GetDrawEventRecorder(mozilla::gfx::DrawEventRecorder** aDrawEventRecorder)
   {
     MOZ_ASSERT(aDrawEventRecorder);
     *aDrawEventRecorder = nullptr;
     return NS_OK;
   }

   /**
    * Override to return something other than the default.
    *
    * @return DPI for printing.
    */
   virtual float GetDPI() { return 72.0f; }

   /**
    * Override to return something other than the default.
    *
    * @return the printing scale to be applied to the context for printing.
    */
   virtual float GetPrintingScale() { return 1.0f;  }

   NS_IMETHOD BeginDocument(const nsAString& aTitle,
                            const nsAString& aPrintToFileName,
                            int32_t          aStartPage,
                            int32_t          aEndPage) = 0;

   NS_IMETHOD EndDocument() = 0;
   NS_IMETHOD AbortDocument() { return EndDocument(); }
   NS_IMETHOD BeginPage() = 0;
   NS_IMETHOD EndPage() = 0;
};

NS_DEFINE_STATIC_IID_ACCESSOR(nsIDeviceContextSpec,
                              NS_IDEVICE_CONTEXT_SPEC_IID)
#endif