gecko-dev/dom/src/base/nsScreen.cpp

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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 * for the specific language governing rights and limitations under the
 * License.
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 * The Original Code is mozilla.org code.
 *
 * The Initial Developer of the Original Code is 
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 * Portions created by the Initial Developer are Copyright (C) 1998
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 *
 * Contributor(s):
 *    Travis Bogard <travis@netscape.com> 
 *
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#include "nscore.h"
#include "nsScreen.h"
#include "nsIDOMWindow.h"
#include "nsIScriptGlobalObject.h"
#include "nsIDocShell.h"
#include "nsIDeviceContext.h"
#include "nsIPresContext.h"
#include "nsCOMPtr.h"
#include "nsIDocumentViewer.h"
#include "nsIDocumentLoader.h"
#include "nsDOMClassInfo.h"


//
//  Screen class implementation
//
ScreenImpl::ScreenImpl(nsIDocShell* aDocShell) : mDocShell(aDocShell)
{
}

ScreenImpl::~ScreenImpl()
{
}


// QueryInterface implementation for ScreenImpl
NS_INTERFACE_MAP_BEGIN(ScreenImpl)
  NS_INTERFACE_MAP_ENTRY(nsISupports)
  NS_INTERFACE_MAP_ENTRY(nsIDOMScreen)
  NS_DOM_INTERFACE_MAP_ENTRY_CLASSINFO(Screen)
NS_INTERFACE_MAP_END


NS_IMPL_ADDREF(ScreenImpl)
NS_IMPL_RELEASE(ScreenImpl)


NS_IMETHODIMP ScreenImpl::SetDocShell(nsIDocShell* aDocShell)
{
   mDocShell = aDocShell; // Weak Reference
   return NS_OK;
}

NS_IMETHODIMP
ScreenImpl::GetTop(PRInt32* aTop)
{
  nsCOMPtr<nsIDeviceContext> context(GetDeviceContext());

  if (context) {
    nsRect rect;
    context->GetRect(rect);

    float devUnits;
    context->GetDevUnitsToAppUnits(devUnits);

    *aTop = NSToIntRound(float(rect.y) / devUnits);

    return NS_OK;
  }

  *aTop = -1;

  return NS_ERROR_FAILURE;
}


NS_IMETHODIMP
ScreenImpl::GetLeft(PRInt32* aLeft)
{
  nsCOMPtr<nsIDeviceContext> context(GetDeviceContext());

  if (context) {
    nsRect rect;
    context->GetRect(rect);

    float devUnits;
    context->GetDevUnitsToAppUnits(devUnits);

    *aLeft = NSToIntRound(float(rect.x) / devUnits);

    return NS_OK;
  }

  *aLeft = -1;

  return NS_ERROR_FAILURE;
}


NS_IMETHODIMP
ScreenImpl::GetWidth(PRInt32* aWidth)
{
  nsCOMPtr<nsIDeviceContext> context(GetDeviceContext());

  if (context) {
    PRInt32 height;
    context->GetDeviceSurfaceDimensions(*aWidth, height);

    float devUnits;
    context->GetDevUnitsToAppUnits(devUnits);

    *aWidth = NSToIntRound(float(*aWidth) / devUnits);

    return NS_OK;
  }

  *aWidth = -1;

  return NS_ERROR_FAILURE;
}

NS_IMETHODIMP
ScreenImpl::GetHeight(PRInt32* aHeight)
{
  nsCOMPtr<nsIDeviceContext> context(GetDeviceContext());

  if (context) {
    PRInt32 width;
    context->GetDeviceSurfaceDimensions(width, *aHeight);

    float devUnits;
    context->GetDevUnitsToAppUnits(devUnits);

    *aHeight = NSToIntRound(float(*aHeight) / devUnits);

    return NS_OK;
  }

  *aHeight = -1;

  return NS_ERROR_FAILURE;
}

NS_IMETHODIMP
ScreenImpl::GetPixelDepth(PRInt32* aPixelDepth)
{
  nsCOMPtr<nsIDeviceContext> context(GetDeviceContext());

  if (context) {
    PRUint32 depth;
    context->GetDepth(depth);

    *aPixelDepth = depth;

    return NS_OK;
  }

  *aPixelDepth = -1;

  return NS_ERROR_FAILURE;
}

NS_IMETHODIMP
ScreenImpl::GetColorDepth(PRInt32* aColorDepth)
{
  nsCOMPtr<nsIDeviceContext> context(GetDeviceContext());

  if (context) {
    PRUint32 depth;
    context->GetDepth(depth);

    *aColorDepth = depth;

    return NS_OK;
  }

  *aColorDepth = -1;

  return NS_ERROR_FAILURE;
}

NS_IMETHODIMP
ScreenImpl::GetAvailWidth(PRInt32* aAvailWidth)
{
  nsCOMPtr<nsIDeviceContext> context(GetDeviceContext());

  if (context) {
    nsRect rect;
    context->GetClientRect(rect);

    float devUnits;
    context->GetDevUnitsToAppUnits(devUnits);

    *aAvailWidth = NSToIntRound(float(rect.width) / devUnits);

    return NS_OK;
  }

  *aAvailWidth = -1;

  return NS_ERROR_FAILURE;
}

NS_IMETHODIMP
ScreenImpl::GetAvailHeight(PRInt32* aAvailHeight)
{
  nsCOMPtr<nsIDeviceContext> context(GetDeviceContext());

  if (context) {
    nsRect rect;
    context->GetClientRect(rect);

    float devUnits;
    context->GetDevUnitsToAppUnits(devUnits);

    *aAvailHeight = NSToIntRound(float(rect.height) / devUnits);

    return NS_OK;
  }

  *aAvailHeight = -1;

  return NS_ERROR_FAILURE;
}

NS_IMETHODIMP
ScreenImpl::GetAvailLeft(PRInt32* aAvailLeft)
{
  nsCOMPtr<nsIDeviceContext> context(GetDeviceContext());

  if (context) {
    nsRect rect;
    context->GetClientRect(rect);

    float devUnits;
    context->GetDevUnitsToAppUnits(devUnits);

    *aAvailLeft = NSToIntRound(float(rect.x) / devUnits);

    return NS_OK;
  }

  *aAvailLeft = -1;

  return NS_ERROR_FAILURE;
}

NS_IMETHODIMP
ScreenImpl::GetAvailTop(PRInt32* aAvailTop)
{
  nsCOMPtr<nsIDeviceContext> context(GetDeviceContext());

  if (context) {
    nsRect rect;
    context->GetClientRect(rect);

    float devUnits;
    context->GetDevUnitsToAppUnits(devUnits);

    *aAvailTop = NSToIntRound(float(rect.y) / devUnits);

    return NS_OK;
  }

  *aAvailTop = -1;

  return NS_ERROR_FAILURE;
}

already_AddRefed<nsIDeviceContext> ScreenImpl::GetDeviceContext()
{
  if(!mDocShell)
    return nsnull;

  nsCOMPtr<nsIContentViewer> contentViewer;
  mDocShell->GetContentViewer(getter_AddRefs(contentViewer));

  nsCOMPtr<nsIDocumentViewer> docViewer(do_QueryInterface(contentViewer));
  if(!docViewer)
    return nsnull;

  nsCOMPtr<nsIPresContext> presContext;
  docViewer->GetPresContext(getter_AddRefs(presContext));

  nsIDeviceContext* context = nsnull;
  if(presContext)
    presContext->GetDeviceContext(&context);

  return context;
}