Mozilla/mozilla/layout/base/src/nsPrintPreviewContext.cpp

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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 * The Original Code is mozilla.org code.
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 * The Initial Developer of the Original Code is 
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 *
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#include "nsPresContext.h"
#include "nsIPrintPreviewContext.h"
#include "nsIDeviceContext.h"
#include "nsUnitConversion.h"
#include "nsIView.h"
#include "nsIWidget.h"
#include "nsGfxCIID.h"
#include "nsLayoutAtoms.h"
#include "prlog.h"

// Print Options
#include "nsIPrintOptions.h"
#include "nsGfxCIID.h"
#include "nsIServiceManager.h"
static NS_DEFINE_CID(kPrintOptionsCID, NS_PRINTOPTIONS_CID);

class PrintPreviewContext : public nsPresContext {
public:
  PrintPreviewContext();
  ~PrintPreviewContext();

//Interfaces for addref and release and queryinterface
//NOTE macro used is for classes that inherit from 
// another class. Only the base class should use NS_DECL_ISUPPORTS
  NS_DECL_ISUPPORTS_INHERITED

  NS_IMETHOD GetMedium(nsIAtom** aMedium);
  NS_IMETHOD IsPaginated(PRBool* aResult);
  NS_IMETHOD SetPaginatedScrolling(PRBool aResult) { mCanPaginatedScroll = aResult; return NS_OK; }
  NS_IMETHOD GetPaginatedScrolling(PRBool* aResult);
  NS_IMETHOD GetPageDim(nsRect* aActualRect, nsRect* aAdjRect);
  NS_IMETHOD SetPageDim(nsRect* aRect);

protected:
  nsRect mPageDim;
  PRBool mCanPaginatedScroll;
};

PrintPreviewContext::PrintPreviewContext() :
  mPageDim(-1,-1,-1,-1),
  mCanPaginatedScroll(PR_TRUE)
{
}

PrintPreviewContext::~PrintPreviewContext()
{
}

NS_IMPL_ADDREF_INHERITED(PrintPreviewContext,nsPresContext)
NS_IMPL_RELEASE_INHERITED(PrintPreviewContext,nsPresContext)

//---------------------------------------------------------
NS_IMETHODIMP
PrintPreviewContext::QueryInterface(REFNSIID aIID, void** aInstancePtr)
{
 
  if (aIID.Equals(NS_GET_IID(nsIPrintPreviewContext))) {
    *aInstancePtr = (void *)((nsIPrintPreviewContext*)this);
    NS_ADDREF_THIS();
    return NS_OK;
  }

  return nsPresContext::QueryInterface(aIID, aInstancePtr);
}

NS_IMETHODIMP
PrintPreviewContext::GetMedium(nsIAtom** aResult)
{
  NS_ENSURE_ARG_POINTER(aResult);
  *aResult = nsLayoutAtoms::print;
  NS_ADDREF(*aResult);
  return NS_OK;
}

NS_IMETHODIMP
PrintPreviewContext::IsPaginated(PRBool* aResult)
{
  NS_ENSURE_ARG_POINTER(aResult);
  *aResult = PR_TRUE;
  return NS_OK;
}

NS_IMETHODIMP
PrintPreviewContext::GetPaginatedScrolling(PRBool* aResult)
{
  NS_ENSURE_ARG_POINTER(aResult);
  *aResult = mCanPaginatedScroll;
  return NS_OK;
}

NS_IMETHODIMP
PrintPreviewContext::GetPageDim(nsRect* aActualRect, nsRect* aAdjRect)
{
  NS_ENSURE_ARG_POINTER(aActualRect);
  NS_ENSURE_ARG_POINTER(aAdjRect);

  PRInt32 width,height;
  if (NS_SUCCEEDED(mDeviceContext->GetDeviceSurfaceDimensions(width, height))) {
    aActualRect->SetRect(0, 0, width, height);
  }
  *aAdjRect = mPageDim;
  return NS_OK;
}

NS_IMETHODIMP
PrintPreviewContext::SetPageDim(nsRect* aPageDim)
{
  NS_ENSURE_ARG_POINTER(aPageDim);
  mPageDim = *aPageDim;
  return NS_OK;
}

NS_EXPORT nsresult
NS_NewPrintPreviewContext(nsIPresContext** aInstancePtrResult)
{
  if (aInstancePtrResult == nsnull) {
    return NS_ERROR_NULL_POINTER;
  }

  PrintPreviewContext *it = new PrintPreviewContext();

  if (it == nsnull) {
    return NS_ERROR_OUT_OF_MEMORY;
  }

  return it->QueryInterface(NS_GET_IID(nsIPresContext), (void **) aInstancePtrResult);
}