widget/src/shared/WidgetUtils.cpp
author David Anderson <danderson@mozilla.com>
Wed, 05 Oct 2011 18:37:11 -0700
changeset 112094 cad26d2fb5af799dfe030fd2a8948d617eac2f52
parent 59570 d488f09f6f8d7652107ec264d51f7b04816afffa
permissions -rw-r--r--
Backout merge.

/* -*- 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
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 * The Initial Developer of the Original Code is
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 *   Stuart Parmenter <pavlov@netscape.com>
 *   Mike Pinkerton   <pinkerton@netscape.com>
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#include "WidgetUtils.h"

#include "nsIBaseWindow.h"
#include "nsIDocShellTreeItem.h"
#include "nsIDocShell.h"
#include "nsIInterfaceRequestorUtils.h"

namespace mozilla {
namespace widget {

//static
already_AddRefed<nsIWidget>
WidgetUtils::DOMWindowToWidget(nsIDOMWindow *aDOMWindow)
{
  nsCOMPtr<nsIWidget> widget;

  nsCOMPtr<nsPIDOMWindow> window = do_QueryInterface(aDOMWindow);
  if (window) {
    nsCOMPtr<nsIBaseWindow> baseWin(do_QueryInterface(window->GetDocShell()));

    while (!widget && baseWin) {
      baseWin->GetParentWidget(getter_AddRefs(widget));
      if (!widget) {
        nsCOMPtr<nsIDocShellTreeItem> docShellAsItem(do_QueryInterface(baseWin));
        if (!docShellAsItem)
          return nsnull;

        nsCOMPtr<nsIDocShellTreeItem> parent;
        docShellAsItem->GetParent(getter_AddRefs(parent));

        window = do_GetInterface(parent);
        if (!window)
          return nsnull;

        baseWin = do_QueryInterface(window->GetDocShell());
      }
    }
  }

  return widget.forget();
}

// class BrightnessLockingWidget

BrightnessLockingWidget::BrightnessLockingWidget()
{
  for (PRUint32 i = 0; i < nsIScreen_MOZILLA_2_0_BRANCH::BRIGHTNESS_LEVELS; i++)
    mBrightnessLocks[i] = 0;
}

NS_IMETHODIMP
BrightnessLockingWidget::LockMinimumBrightness(PRUint32 aBrightness)
{
  NS_ABORT_IF_FALSE(
    aBrightness < nsIScreen_MOZILLA_2_0_BRANCH::BRIGHTNESS_LEVELS,
    "Invalid brightness level to lock");
  mBrightnessLocks[aBrightness]++;
  NS_ABORT_IF_FALSE(mBrightnessLocks[aBrightness] > 0,
    "Overflow after locking brightness level");

  CheckMinimumBrightness();

  return NS_OK;
}

NS_IMETHODIMP
BrightnessLockingWidget::UnlockMinimumBrightness(PRUint32 aBrightness)
{
  NS_ABORT_IF_FALSE(
    aBrightness < nsIScreen_MOZILLA_2_0_BRANCH::BRIGHTNESS_LEVELS,
    "Invalid brightness level to lock");
  NS_ABORT_IF_FALSE(mBrightnessLocks[aBrightness] > 0,
    "Unlocking a brightness level with no corresponding lock");
  mBrightnessLocks[aBrightness]--;

  CheckMinimumBrightness();

  return NS_OK;
}

void
BrightnessLockingWidget::CheckMinimumBrightness()
{
  PRUint32 brightness = nsIScreen_MOZILLA_2_0_BRANCH::BRIGHTNESS_LEVELS;
  for (PRUint32 i = 0; i < nsIScreen_MOZILLA_2_0_BRANCH::BRIGHTNESS_LEVELS; i++)
    if (mBrightnessLocks[i] > 0)
      brightness = i;

  ApplyMinimumBrightness(brightness);
}

} // namespace widget
} // namespace mozilla