From bbbc2fd341cad3a220a343530e66600e38bd79ca Mon Sep 17 00:00:00 2001
From: Juha Kotiranta <t4jkotir@gmail.com>
Date: Fri, 17 Sep 2010 11:56:53 -0700
Subject: [PATCH] Bug 581916 - Fetching mouse cursor from window trough DOM
 window utils API. r=Olli.Pettay a=approval2.0

---
 content/events/src/nsEventStateManager.cpp |  8 ++++++
 content/events/src/nsEventStateManager.h   |  2 ++
 dom/base/nsDOMWindowUtils.cpp              | 33 ++++++++++++++++++++++
 dom/interfaces/base/nsIDOMWindowUtils.idl  |  8 +++++-
 4 files changed, 50 insertions(+), 1 deletion(-)

diff --git a/content/events/src/nsEventStateManager.cpp b/content/events/src/nsEventStateManager.cpp
index 53fcaf62c87c..4072a300da5e 100644
--- a/content/events/src/nsEventStateManager.cpp
+++ b/content/events/src/nsEventStateManager.cpp
@@ -186,6 +186,7 @@ static PRInt32 sChromeAccessModifier = 0, sContentAccessModifier = 0;
 PRInt32 nsEventStateManager::sUserInputEventDepth = 0;
 PRBool nsEventStateManager::sNormalLMouseEventInProcess = PR_FALSE;
 nsEventStateManager* nsEventStateManager::sActiveESM = nsnull;
+nsIDocument* nsEventStateManager::sMouseOverDocument = nsnull;
 
 static PRUint32 gMouseOrKeyboardEventCounter = 0;
 static nsITimer* gUserInteractionTimer = nsnull;
@@ -860,6 +861,9 @@ nsEventStateManager::~nsEventStateManager()
   if (mClickHoldContextMenu)
     KillClickHoldTimer();
 
+  if (mDocument == sMouseOverDocument)
+    sMouseOverDocument = nsnull;
+
   --sESMInstanceCount;
   if(sESMInstanceCount == 0) {
     nsMouseWheelTransaction::Shutdown();
@@ -3410,6 +3414,10 @@ nsEventStateManager::SetCursor(PRInt32 aCursor, imgIContainer* aContainer,
                                float aHotspotX, float aHotspotY,
                                nsIWidget* aWidget, PRBool aLockCursor)
 {
+  EnsureDocument(mPresContext);
+  NS_ENSURE_TRUE(mDocument, NS_ERROR_FAILURE);
+  sMouseOverDocument = mDocument.get();
+
   nsCursor c;
 
   NS_ENSURE_TRUE(aWidget, NS_ERROR_FAILURE);
diff --git a/content/events/src/nsEventStateManager.h b/content/events/src/nsEventStateManager.h
index a32928f08f30..490b7081d852 100644
--- a/content/events/src/nsEventStateManager.h
+++ b/content/events/src/nsEventStateManager.h
@@ -147,6 +147,8 @@ public:
   NS_DECL_CYCLE_COLLECTION_CLASS_AMBIGUOUS(nsEventStateManager,
                                            nsIEventStateManager)
 
+  static nsIDocument* sMouseOverDocument;
+
 protected:
   void UpdateCursor(nsPresContext* aPresContext, nsEvent* aEvent, nsIFrame* aTargetFrame, nsEventStatus* aStatus);
   /**
diff --git a/dom/base/nsDOMWindowUtils.cpp b/dom/base/nsDOMWindowUtils.cpp
index 369cf2f31f5f..aecc957f2206 100644
--- a/dom/base/nsDOMWindowUtils.cpp
+++ b/dom/base/nsDOMWindowUtils.cpp
@@ -47,6 +47,7 @@
 #include "nsIDocument.h"
 #include "nsFocusManager.h"
 #include "nsIEventStateManager.h"
+#include "nsEventStateManager.h"
 
 #include "nsIScrollableFrame.h"
 
@@ -1575,3 +1576,35 @@ nsDOMWindowUtils::RenderDocument(const nsRect& aRect,
     // Render Document
     return presShell->RenderDocument(aRect, aFlags, aBackgroundColor, aThebesContext);
 }
+
+NS_IMETHODIMP 
+nsDOMWindowUtils::GetCursorType(PRInt16 *aCursor)
+{
+  NS_ENSURE_ARG_POINTER(aCursor);
+
+  PRBool isSameDoc = PR_FALSE;
+  nsCOMPtr<nsIDocument> doc(do_QueryInterface(mWindow->GetExtantDocument()));
+
+  NS_ENSURE_TRUE(doc, NS_ERROR_FAILURE);
+
+  do {
+    if (nsEventStateManager::sMouseOverDocument == doc.get()) {
+      isSameDoc = PR_TRUE;
+      break;
+    }
+  } while ((doc = doc->GetParentDocument()));
+
+  if (!isSameDoc) {
+    *aCursor = eCursor_none;
+    return NS_OK;
+  }
+
+  nsCOMPtr<nsIWidget> widget = GetWidget();
+  if (!widget)
+    return NS_ERROR_FAILURE;
+
+  // fetch cursor value from window's widget
+  *aCursor = widget->GetCursor();
+
+  return NS_OK;
+}
diff --git a/dom/interfaces/base/nsIDOMWindowUtils.idl b/dom/interfaces/base/nsIDOMWindowUtils.idl
index 9ee69b72e580..8e7dc99bdeb3 100644
--- a/dom/interfaces/base/nsIDOMWindowUtils.idl
+++ b/dom/interfaces/base/nsIDOMWindowUtils.idl
@@ -60,7 +60,7 @@ interface nsIDOMEvent;
 interface nsITransferable;
 interface nsIQueryContentEventResult;
 
-[scriptable, uuid(74fdd125-52c7-4345-a086-270df15b829a)]
+[scriptable, uuid(8707ed93-3277-42a5-a235-533aa661a263)]
 interface nsIDOMWindowUtils : nsISupports {
 
   /**
@@ -89,6 +89,12 @@ interface nsIDOMWindowUtils : nsISupports {
    */
   readonly attribute boolean docCharsetIsForced;
 
+  /**
+   * Get current cursor type from this window
+   * @return the current value of nsCursor
+   */
+  short getCursorType();
+
   /**
    * Function to get metadata associated with the window's current document
    * @param aName the name of the metadata.  This should be all lowercase.