widget/src/shared/WidgetUtils.cpp

   1 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
   2  *
   3  * ***** BEGIN LICENSE BLOCK *****
   4  * Version: MPL 1.1/GPL 2.0/LGPL 2.1
   5  *
   6  * The contents of this file are subject to the Mozilla Public License Version
   7  * 1.1 (the "License"); you may not use this file except in compliance with
   8  * the License. You may obtain a copy of the License at
   9  * http://www.mozilla.org/MPL/
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  11  * Software distributed under the License is distributed on an "AS IS" basis,
  12  * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
  13  * for the specific language governing rights and limitations under the
  14  * License.
  15  *
  16  * The Original Code is the Mozilla browser.
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  18  * The Initial Developer of the Original Code is
  19  * Netscape Communications Corporation.
  20  * Portions created by the Initial Developer are Copyright (C) 1999
  21  * the Initial Developer. All Rights Reserved.
  22  *
  23  * Contributor(s):
  24  *   Stuart Parmenter <pavlov@netscape.com>
  25  *   Mike Pinkerton   <pinkerton@netscape.com>
  26  *
  27  * Alternatively, the contents of this file may be used under the terms of
  28  * either the GNU General Public License Version 2 or later (the "GPL"), or
  29  * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
  30  * in which case the provisions of the GPL or the LGPL are applicable instead
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  39  * ***** END LICENSE BLOCK ***** */
  40
  41 #include "WidgetUtils.h"
  42
  43 #include "nsIBaseWindow.h"
  44 #include "nsIDocShellTreeItem.h"
  45 #include "nsIDocShell.h"
  46 #include "nsIInterfaceRequestorUtils.h"
  47
  48 namespace mozilla {
  49 namespace widget {
  50
  51 //static
  52 already_AddRefed<nsIWidget>
  53 WidgetUtils::DOMWindowToWidget(nsIDOMWindow *aDOMWindow)
  54 {
  55   nsCOMPtr<nsIWidget> widget;
  56
  57   nsCOMPtr<nsPIDOMWindow> window = do_QueryInterface(aDOMWindow);
  58   if (window) {
  59     nsCOMPtr<nsIBaseWindow> baseWin(do_QueryInterface(window->GetDocShell()));
  60
  61     while (!widget && baseWin) {
  62       baseWin->GetParentWidget(getter_AddRefs(widget));
  63       if (!widget) {
  64         nsCOMPtr<nsIDocShellTreeItem> docShellAsItem(do_QueryInterface(baseWin));
  65         if (!docShellAsItem)
  66           return nsnull;
  67
  68         nsCOMPtr<nsIDocShellTreeItem> parent;
  69         docShellAsItem->GetParent(getter_AddRefs(parent));
  70
  71         window = do_GetInterface(parent);
  72         if (!window)
  73           return nsnull;
  74
  75         baseWin = do_QueryInterface(window->GetDocShell());
  76       }
  77     }
  78   }
  79
  80   return widget.forget();
  81 }
  82
  83 // class BrightnessLockingWidget
  84
  85 BrightnessLockingWidget::BrightnessLockingWidget()
  86 {
  87   for (PRUint32 i = 0; i < nsIScreen_MOZILLA_2_0_BRANCH::BRIGHTNESS_LEVELS; i++)
  88     mBrightnessLocks[i] = 0;
  89 }
  90
  91 NS_IMETHODIMP
  92 BrightnessLockingWidget::LockMinimumBrightness(PRUint32 aBrightness)
  93 {
  94   NS_ABORT_IF_FALSE(
  95     aBrightness < nsIScreen_MOZILLA_2_0_BRANCH::BRIGHTNESS_LEVELS,
  96     "Invalid brightness level to lock");
  97   mBrightnessLocks[aBrightness]++;
  98   NS_ABORT_IF_FALSE(mBrightnessLocks[aBrightness] > 0,
  99     "Overflow after locking brightness level");
 100
 101   CheckMinimumBrightness();
 102
 103   return NS_OK;
 104 }
 105
 106 NS_IMETHODIMP
 107 BrightnessLockingWidget::UnlockMinimumBrightness(PRUint32 aBrightness)
 108 {
 109   NS_ABORT_IF_FALSE(
 110     aBrightness < nsIScreen_MOZILLA_2_0_BRANCH::BRIGHTNESS_LEVELS,
 111     "Invalid brightness level to lock");
 112   NS_ABORT_IF_FALSE(mBrightnessLocks[aBrightness] > 0,
 113     "Unlocking a brightness level with no corresponding lock");
 114   mBrightnessLocks[aBrightness]--;
 115
 116   CheckMinimumBrightness();
 117
 118   return NS_OK;
 119 }
 120
 121 void
 122 BrightnessLockingWidget::CheckMinimumBrightness()
 123 {
 124   PRUint32 brightness = nsIScreen_MOZILLA_2_0_BRANCH::BRIGHTNESS_LEVELS;
 125   for (PRUint32 i = 0; i < nsIScreen_MOZILLA_2_0_BRANCH::BRIGHTNESS_LEVELS; i++)
 126     if (mBrightnessLocks[i] > 0)
 127       brightness = i;
 128
 129   ApplyMinimumBrightness(brightness);
 130 }
 131
 132 } // namespace widget
 133 } // namespace mozilla