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gecko-dev/xpfe/appshell/nsWindowMediator.cpp

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "nsCOMPtr.h"
#include "nsString.h"
#include "nsReadableUtils.h"
#include "nsUnicharUtils.h"
#include "nsTArray.h"
#include "nsIBaseWindow.h"
#include "nsIWidget.h"
#include "nsIDOMWindow.h"
#include "nsIObserverService.h"
#include "nsIServiceManager.h"
#include "nsISimpleEnumerator.h"
#include "nsAppShellWindowEnumerator.h"
#include "nsWindowMediator.h"
#include "nsIWindowMediatorListener.h"
#include "nsXPIDLString.h"
#include "nsGlobalWindow.h"
#include "nsIDocShell.h"
#include "nsIInterfaceRequestor.h"
#include "nsIInterfaceRequestorUtils.h"
#include "nsIXULWindow.h"
using namespace mozilla;
nsresult
nsWindowMediator::GetDOMWindow(nsIXULWindow* inWindow,
nsCOMPtr<nsPIDOMWindowOuter>& outDOMWindow)
{
nsCOMPtr<nsIDocShell> docShell;
outDOMWindow = nullptr;
inWindow->GetDocShell(getter_AddRefs(docShell));
NS_ENSURE_TRUE(docShell, NS_ERROR_FAILURE);
outDOMWindow = docShell->GetWindow();
return outDOMWindow ? NS_OK : NS_ERROR_FAILURE;
}
nsWindowMediator::nsWindowMediator() :
mEnumeratorList(), mOldestWindow(nullptr), mTopmostWindow(nullptr),
mTimeStamp(0), mSortingZOrder(false), mReady(false)
{
}
nsWindowMediator::~nsWindowMediator()
{
while (mOldestWindow)
UnregisterWindow(mOldestWindow);
}
nsresult nsWindowMediator::Init()
{
nsresult rv;
nsCOMPtr<nsIObserverService> obsSvc =
do_GetService("@mozilla.org/observer-service;1", &rv);
NS_ENSURE_SUCCESS(rv, rv);
rv = obsSvc->AddObserver(this, "xpcom-shutdown", true);
NS_ENSURE_SUCCESS(rv, rv);
mReady = true;
return NS_OK;
}
NS_IMETHODIMP nsWindowMediator::RegisterWindow(nsIXULWindow* inWindow)
{
MOZ_RELEASE_ASSERT(NS_IsMainThread());
NS_ENSURE_STATE(mReady);
if (GetInfoFor(inWindow)) {
NS_ERROR("multiple window registration");
return NS_ERROR_FAILURE;
}
mTimeStamp++;
// Create window info struct and add to list of windows
nsWindowInfo* windowInfo = new nsWindowInfo(inWindow, mTimeStamp);
ListenerArray::ForwardIterator iter(mListeners);
while (iter.HasMore()) {
iter.GetNext()->OnOpenWindow(inWindow);
}
if (mOldestWindow)
windowInfo->InsertAfter(mOldestWindow->mOlder, nullptr);
else
mOldestWindow = windowInfo;
return NS_OK;
}
NS_IMETHODIMP
nsWindowMediator::UnregisterWindow(nsIXULWindow* inWindow)
{
MOZ_RELEASE_ASSERT(NS_IsMainThread());
NS_ENSURE_STATE(mReady);
nsWindowInfo *info = GetInfoFor(inWindow);
if (info)
return UnregisterWindow(info);
return NS_ERROR_INVALID_ARG;
}
nsresult
nsWindowMediator::UnregisterWindow(nsWindowInfo *inInfo)
{
// Inform the iterators
uint32_t index = 0;
while (index < mEnumeratorList.Length()) {
mEnumeratorList[index]->WindowRemoved(inInfo);
index++;
}
nsIXULWindow* window = inInfo->mWindow.get();
ListenerArray::ForwardIterator iter(mListeners);
while (iter.HasMore()) {
iter.GetNext()->OnCloseWindow(window);
}
// Remove from the lists and free up
if (inInfo == mOldestWindow)
mOldestWindow = inInfo->mYounger;
if (inInfo == mTopmostWindow)
mTopmostWindow = inInfo->mLower;
inInfo->Unlink(true, true);
if (inInfo == mOldestWindow)
mOldestWindow = nullptr;
if (inInfo == mTopmostWindow)
mTopmostWindow = nullptr;
delete inInfo;
return NS_OK;
}
nsWindowInfo*
nsWindowMediator::GetInfoFor(nsIXULWindow *aWindow)
{
nsWindowInfo *info,
*listEnd;
if (!aWindow)
return nullptr;
info = mOldestWindow;
listEnd = nullptr;
while (info != listEnd) {
if (info->mWindow.get() == aWindow)
return info;
info = info->mYounger;
listEnd = mOldestWindow;
}
return nullptr;
}
nsWindowInfo*
nsWindowMediator::GetInfoFor(nsIWidget *aWindow)
{
nsWindowInfo *info,
*listEnd;
if (!aWindow)
return nullptr;
info = mOldestWindow;
listEnd = nullptr;
nsCOMPtr<nsIWidget> scanWidget;
while (info != listEnd) {
nsCOMPtr<nsIBaseWindow> base(do_QueryInterface(info->mWindow));
if (base)
base->GetMainWidget(getter_AddRefs(scanWidget));
if (aWindow == scanWidget.get())
return info;
info = info->mYounger;
listEnd = mOldestWindow;
}
return nullptr;
}
NS_IMETHODIMP
nsWindowMediator::GetEnumerator(const char16_t* inType, nsISimpleEnumerator** outEnumerator)
{
MOZ_RELEASE_ASSERT(NS_IsMainThread());
NS_ENSURE_ARG_POINTER(outEnumerator);
NS_ENSURE_STATE(mReady);
RefPtr<nsAppShellWindowEnumerator> enumerator = new nsASDOMWindowEarlyToLateEnumerator(inType, *this);
enumerator.forget(outEnumerator);
return NS_OK;
}
NS_IMETHODIMP
nsWindowMediator::GetXULWindowEnumerator(const char16_t* inType, nsISimpleEnumerator** outEnumerator)
{
MOZ_RELEASE_ASSERT(NS_IsMainThread());
NS_ENSURE_ARG_POINTER(outEnumerator);
NS_ENSURE_STATE(mReady);
RefPtr<nsAppShellWindowEnumerator> enumerator = new nsASXULWindowEarlyToLateEnumerator(inType, *this);
enumerator.forget(outEnumerator);
return NS_OK;
}
NS_IMETHODIMP
nsWindowMediator::GetZOrderDOMWindowEnumerator(
const char16_t *aWindowType, bool aFrontToBack,
nsISimpleEnumerator **_retval)
{
MOZ_RELEASE_ASSERT(NS_IsMainThread());
NS_ENSURE_ARG_POINTER(_retval);
NS_ENSURE_STATE(mReady);
RefPtr<nsAppShellWindowEnumerator> enumerator;
if (aFrontToBack)
enumerator = new nsASDOMWindowFrontToBackEnumerator(aWindowType, *this);
else
enumerator = new nsASDOMWindowBackToFrontEnumerator(aWindowType, *this);
enumerator.forget(_retval);
return NS_OK;
}
NS_IMETHODIMP
nsWindowMediator::GetZOrderXULWindowEnumerator(
const char16_t *aWindowType, bool aFrontToBack,
nsISimpleEnumerator **_retval)
{
MOZ_RELEASE_ASSERT(NS_IsMainThread());
NS_ENSURE_ARG_POINTER(_retval);
NS_ENSURE_STATE(mReady);
RefPtr<nsAppShellWindowEnumerator> enumerator;
if (aFrontToBack)
enumerator = new nsASXULWindowFrontToBackEnumerator(aWindowType, *this);
else
enumerator = new nsASXULWindowBackToFrontEnumerator(aWindowType, *this);
enumerator.forget(_retval);
return NS_OK;
}
int32_t
nsWindowMediator::AddEnumerator(nsAppShellWindowEnumerator * inEnumerator)
{
return mEnumeratorList.AppendElement(inEnumerator) != nullptr;
}
int32_t
nsWindowMediator::RemoveEnumerator(nsAppShellWindowEnumerator * inEnumerator)
{
return mEnumeratorList.RemoveElement(inEnumerator);
}
// Returns the window of type inType ( if null return any window type ) which has the most recent
// time stamp
NS_IMETHODIMP
nsWindowMediator::GetMostRecentWindow(const char16_t* inType,
mozIDOMWindowProxy** outWindow)
{
MOZ_RELEASE_ASSERT(NS_IsMainThread());
NS_ENSURE_ARG_POINTER(outWindow);
*outWindow = nullptr;
if (!mReady)
return NS_OK;
// Find the most window with the highest time stamp that matches
// the requested type
nsWindowInfo* info = MostRecentWindowInfo(inType, false);
if (info && info->mWindow) {
nsCOMPtr<nsPIDOMWindowOuter> DOMWindow;
if (NS_SUCCEEDED(GetDOMWindow(info->mWindow, DOMWindow))) {
DOMWindow.forget(outWindow);
return NS_OK;
}
return NS_ERROR_FAILURE;
}
return NS_OK;
}
NS_IMETHODIMP
nsWindowMediator::GetMostRecentNonPBWindow(const char16_t* aType, mozIDOMWindowProxy** aWindow)
{
MOZ_RELEASE_ASSERT(NS_IsMainThread());
NS_ENSURE_ARG_POINTER(aWindow);
*aWindow = nullptr;
nsWindowInfo *info = MostRecentWindowInfo(aType, true);
nsCOMPtr<nsPIDOMWindowOuter> domWindow;
if (info && info->mWindow) {
GetDOMWindow(info->mWindow, domWindow);
}
if (!domWindow) {
return NS_ERROR_FAILURE;
}
domWindow.forget(aWindow);
return NS_OK;
}
nsWindowInfo*
nsWindowMediator::MostRecentWindowInfo(const char16_t* inType,
bool aSkipPrivateBrowsingOrClosed)
{
int32_t lastTimeStamp = -1;
nsAutoString typeString(inType);
bool allWindows = !inType || typeString.IsEmpty();
// Find the most recent window with the highest time stamp that matches
// the requested type and has the correct browsing mode.
nsWindowInfo* searchInfo = mOldestWindow;
nsWindowInfo* listEnd = nullptr;
nsWindowInfo* foundInfo = nullptr;
for (; searchInfo != listEnd; searchInfo = searchInfo->mYounger) {
listEnd = mOldestWindow;
if (!allWindows && !searchInfo->TypeEquals(typeString)) {
continue;
}
if (searchInfo->mTimeStamp < lastTimeStamp) {
continue;
}
if (!searchInfo->mWindow) {
continue;
}
if (aSkipPrivateBrowsingOrClosed) {
nsCOMPtr<nsIDocShell> docShell;
searchInfo->mWindow->GetDocShell(getter_AddRefs(docShell));
nsCOMPtr<nsILoadContext> loadContext = do_QueryInterface(docShell);
if (!loadContext || loadContext->UsePrivateBrowsing()) {
continue;
}
nsCOMPtr<nsPIDOMWindowOuter> piwindow = docShell->GetWindow();
if (!piwindow || piwindow->Closed()) {
continue;
}
}
foundInfo = searchInfo;
lastTimeStamp = searchInfo->mTimeStamp;
}
return foundInfo;
}
NS_IMETHODIMP
nsWindowMediator::GetOuterWindowWithId(uint64_t aWindowID,
mozIDOMWindowProxy** aWindow)
{
RefPtr<nsGlobalWindow> window = nsGlobalWindow::GetOuterWindowWithId(aWindowID);
nsCOMPtr<nsPIDOMWindowOuter> outer = window ? window->AsOuter() : nullptr;
outer.forget(aWindow);
return NS_OK;
}
NS_IMETHODIMP
nsWindowMediator::GetCurrentInnerWindowWithId(uint64_t aWindowID,
mozIDOMWindow** aWindow)
{
RefPtr<nsGlobalWindow> window = nsGlobalWindow::GetInnerWindowWithId(aWindowID);
// not found
if (!window)
return NS_OK;
nsCOMPtr<nsPIDOMWindowInner> inner = window->AsInner();
nsCOMPtr<nsPIDOMWindowOuter> outer = inner->GetOuterWindow();
NS_ENSURE_TRUE(outer, NS_ERROR_UNEXPECTED);
// outer is already using another inner, so it's same as not found
if (outer->GetCurrentInnerWindow() != inner)
return NS_OK;
inner.forget(aWindow);
return NS_OK;
}
NS_IMETHODIMP
nsWindowMediator::UpdateWindowTimeStamp(nsIXULWindow* inWindow)
{
MOZ_RELEASE_ASSERT(NS_IsMainThread());
NS_ENSURE_STATE(mReady);
nsWindowInfo *info = GetInfoFor(inWindow);
if (info) {
// increment the window's time stamp
info->mTimeStamp = ++mTimeStamp;
return NS_OK;
}
return NS_ERROR_FAILURE;
}
NS_IMETHODIMP
nsWindowMediator::UpdateWindowTitle(nsIXULWindow* inWindow,
const char16_t* inTitle)
{
MOZ_RELEASE_ASSERT(NS_IsMainThread());
NS_ENSURE_STATE(mReady);
if (GetInfoFor(inWindow)) {
ListenerArray::ForwardIterator iter(mListeners);
while (iter.HasMore()) {
iter.GetNext()->OnWindowTitleChange(inWindow, inTitle);
}
}
return NS_OK;
}
/* This method's plan is to intervene only when absolutely necessary.
We will get requests to place our windows behind unknown windows.
For the most part, we need to leave those alone (turning them into
explicit requests to be on top breaks Windows.) So generally we
calculate a change as seldom as possible.
*/
NS_IMETHODIMP
nsWindowMediator::CalculateZPosition(
nsIXULWindow *inWindow,
uint32_t inPosition,
nsIWidget *inBelow,
uint32_t *outPosition,
nsIWidget **outBelow,
bool *outAltered)
{
MOZ_RELEASE_ASSERT(NS_IsMainThread());
NS_ENSURE_ARG_POINTER(outBelow);
NS_ENSURE_STATE(mReady);
*outBelow = nullptr;
if (!inWindow || !outPosition || !outAltered)
return NS_ERROR_NULL_POINTER;
if (inPosition != nsIWindowMediator::zLevelTop &&
inPosition != nsIWindowMediator::zLevelBottom &&
inPosition != nsIWindowMediator::zLevelBelow)
return NS_ERROR_INVALID_ARG;
nsWindowInfo *info = mTopmostWindow;
nsIXULWindow *belowWindow = nullptr;
bool found = false;
nsresult result = NS_OK;
*outPosition = inPosition;
*outAltered = false;
if (mSortingZOrder) { // don't fight SortZOrder()
*outBelow = inBelow;
NS_IF_ADDREF(*outBelow);
return NS_OK;
}
uint32_t inZ;
GetZLevel(inWindow, &inZ);
if (inPosition == nsIWindowMediator::zLevelBelow) {
// locate inBelow. use topmost if it can't be found or isn't in the
// z-order list
info = GetInfoFor(inBelow);
if (!info || (info->mYounger != info && info->mLower == info))
info = mTopmostWindow;
else
found = true;
if (!found) {
/* Treat unknown windows as a request to be on top.
Not as it should be, but that's what Windows gives us.
Note we change inPosition, but not *outPosition. This forces
us to go through the "on top" calculation just below, without
necessarily changing the output parameters. */
inPosition = nsIWindowMediator::zLevelTop;
}
}
if (inPosition == nsIWindowMediator::zLevelTop) {
if (mTopmostWindow && mTopmostWindow->mZLevel > inZ) {
// asked for topmost, can't have it. locate highest allowed position.
do {
if (info->mZLevel <= inZ)
break;
info = info->mLower;
} while (info != mTopmostWindow);
*outPosition = nsIWindowMediator::zLevelBelow;
belowWindow = info->mHigher->mWindow;
*outAltered = true;
}
} else if (inPosition == nsIWindowMediator::zLevelBottom) {
if (mTopmostWindow && mTopmostWindow->mHigher->mZLevel < inZ) {
// asked for bottommost, can't have it. locate lowest allowed position.
do {
info = info->mHigher;
if (info->mZLevel >= inZ)
break;
} while (info != mTopmostWindow);
*outPosition = nsIWindowMediator::zLevelBelow;
belowWindow = info->mWindow;
*outAltered = true;
}
} else {
unsigned long relativeZ;
// check that we're in the right z-plane
if (found) {
belowWindow = info->mWindow;
relativeZ = info->mZLevel;
if (relativeZ > inZ) {
// might be OK. is lower window, if any, lower?
if (info->mLower != info && info->mLower->mZLevel > inZ) {
do {
if (info->mZLevel <= inZ)
break;
info = info->mLower;
} while (info != mTopmostWindow);
belowWindow = info->mHigher->mWindow;
*outAltered = true;
}
} else if (relativeZ < inZ) {
// nope. look for a higher window to be behind.
do {
info = info->mHigher;
if (info->mZLevel >= inZ)
break;
} while (info != mTopmostWindow);
if (info->mZLevel >= inZ)
belowWindow = info->mWindow;
else
*outPosition = nsIWindowMediator::zLevelTop;
*outAltered = true;
} // else they're equal, so it's OK
}
}
if (NS_SUCCEEDED(result) && belowWindow) {
nsCOMPtr<nsIBaseWindow> base(do_QueryInterface(belowWindow));
if (base)
base->GetMainWidget(outBelow);
else
result = NS_ERROR_NO_INTERFACE;
}
return result;
}
NS_IMETHODIMP
nsWindowMediator::SetZPosition(
nsIXULWindow *inWindow,
uint32_t inPosition,
nsIXULWindow *inBelow)
{
MOZ_RELEASE_ASSERT(NS_IsMainThread());
nsWindowInfo *inInfo,
*belowInfo;
if ((inPosition != nsIWindowMediator::zLevelTop &&
inPosition != nsIWindowMediator::zLevelBottom &&
inPosition != nsIWindowMediator::zLevelBelow) ||
!inWindow) {
return NS_ERROR_INVALID_ARG;
}
if (mSortingZOrder) // don't fight SortZOrder()
return NS_OK;
NS_ENSURE_STATE(mReady);
/* Locate inWindow and unlink it from the z-order list.
It's important we look for it in the age list, not the z-order list.
This is because the former is guaranteed complete, while
now may be this window's first exposure to the latter. */
inInfo = GetInfoFor(inWindow);
if (!inInfo)
return NS_ERROR_INVALID_ARG;
// locate inBelow, place inWindow behind it
if (inPosition == nsIWindowMediator::zLevelBelow) {
belowInfo = GetInfoFor(inBelow);
// it had better also be in the z-order list
if (belowInfo &&
belowInfo->mYounger != belowInfo && belowInfo->mLower == belowInfo) {
belowInfo = nullptr;
}
if (!belowInfo) {
if (inBelow)
return NS_ERROR_INVALID_ARG;
else
inPosition = nsIWindowMediator::zLevelTop;
}
}
if (inPosition == nsIWindowMediator::zLevelTop ||
inPosition == nsIWindowMediator::zLevelBottom)
belowInfo = mTopmostWindow ? mTopmostWindow->mHigher : nullptr;
if (inInfo != belowInfo) {
inInfo->Unlink(false, true);
inInfo->InsertAfter(nullptr, belowInfo);
}
if (inPosition == nsIWindowMediator::zLevelTop)
mTopmostWindow = inInfo;
return NS_OK;
}
NS_IMETHODIMP
nsWindowMediator::GetZLevel(nsIXULWindow *aWindow, uint32_t *_retval)
{
NS_ENSURE_ARG_POINTER(_retval);
*_retval = nsIXULWindow::normalZ;
nsWindowInfo *info = GetInfoFor(aWindow);
if (info) {
*_retval = info->mZLevel;
} else {
NS_WARNING("getting z level of unregistered window");
// this goes off during window destruction
}
return NS_OK;
}
NS_IMETHODIMP
nsWindowMediator::SetZLevel(nsIXULWindow *aWindow, uint32_t aZLevel)
{
MOZ_RELEASE_ASSERT(NS_IsMainThread());
NS_ENSURE_STATE(mReady);
nsWindowInfo *info = GetInfoFor(aWindow);
NS_ASSERTION(info, "setting z level of unregistered window");
if (!info)
return NS_ERROR_FAILURE;
if (info->mZLevel != aZLevel) {
bool lowered = info->mZLevel > aZLevel;
info->mZLevel = aZLevel;
if (lowered)
SortZOrderFrontToBack();
else
SortZOrderBackToFront();
}
return NS_OK;
}
/* Fix potentially out-of-order windows by performing an insertion sort
on the z-order list. The method will work no matter how broken the
list, but its assumed usage is immediately after one window's z level
has been changed, so one window is potentially out of place. Such a sort
is most efficiently done in a particular direction. Use this one
if a window's z level has just been reduced, so the sort is most efficiently
done front to back.
Note it's hardly worth going to all the trouble to write two versions
of this method except that if we choose the inefficient sorting direction,
on slow systems windows could visibly bubble around the window that
was moved.
*/
void
nsWindowMediator::SortZOrderFrontToBack()
{
nsWindowInfo *scan, // scans list looking for problems
*search, // searches for correct placement for scan window
*prev, // previous search element
*lowest; // bottom-most window in list
bool finished;
if (!mTopmostWindow) // early during program execution there's no z list yet
return; // there's also only one window, so this is not dangerous
mSortingZOrder = true;
/* Step through the list from top to bottom. If we find a window which
should be moved down in the list, move it to its highest legal position. */
do {
finished = true;
lowest = mTopmostWindow->mHigher;
scan = mTopmostWindow;
while (scan != lowest) {
uint32_t scanZ = scan->mZLevel;
if (scanZ < scan->mLower->mZLevel) { // out of order
search = scan->mLower;
do {
prev = search;
search = search->mLower;
} while (prev != lowest && scanZ < search->mZLevel);
// reposition |scan| within the list
if (scan == mTopmostWindow)
mTopmostWindow = scan->mLower;
scan->Unlink(false, true);
scan->InsertAfter(nullptr, prev);
// fix actual window order
nsCOMPtr<nsIBaseWindow> base;
nsCOMPtr<nsIWidget> scanWidget;
nsCOMPtr<nsIWidget> prevWidget;
base = do_QueryInterface(scan->mWindow);
if (base)
base->GetMainWidget(getter_AddRefs(scanWidget));
base = do_QueryInterface(prev->mWindow);
if (base)
base->GetMainWidget(getter_AddRefs(prevWidget));
if (scanWidget)
scanWidget->PlaceBehind(eZPlacementBelow, prevWidget, false);
finished = false;
break;
}
scan = scan->mLower;
}
} while (!finished);
mSortingZOrder = false;
}
// see comment for SortZOrderFrontToBack
void
nsWindowMediator::SortZOrderBackToFront()
{
nsWindowInfo *scan, // scans list looking for problems
*search, // searches for correct placement for scan window
*lowest; // bottom-most window in list
bool finished;
if (!mTopmostWindow) // early during program execution there's no z list yet
return; // there's also only one window, so this is not dangerous
mSortingZOrder = true;
/* Step through the list from bottom to top. If we find a window which
should be moved up in the list, move it to its lowest legal position. */
do {
finished = true;
lowest = mTopmostWindow->mHigher;
scan = lowest;
while (scan != mTopmostWindow) {
uint32_t scanZ = scan->mZLevel;
if (scanZ > scan->mHigher->mZLevel) { // out of order
search = scan;
do {
search = search->mHigher;
} while (search != lowest && scanZ > search->mZLevel);
// reposition |scan| within the list
if (scan != search && scan != search->mLower) {
scan->Unlink(false, true);
scan->InsertAfter(nullptr, search);
}
if (search == lowest)
mTopmostWindow = scan;
// fix actual window order
nsCOMPtr<nsIBaseWindow> base;
nsCOMPtr<nsIWidget> scanWidget;
nsCOMPtr<nsIWidget> searchWidget;
base = do_QueryInterface(scan->mWindow);
if (base)
base->GetMainWidget(getter_AddRefs(scanWidget));
if (mTopmostWindow != scan) {
base = do_QueryInterface(search->mWindow);
if (base)
base->GetMainWidget(getter_AddRefs(searchWidget));
}
if (scanWidget)
scanWidget->PlaceBehind(eZPlacementBelow, searchWidget, false);
finished = false;
break;
}
scan = scan->mHigher;
}
} while (!finished);
mSortingZOrder = false;
}
NS_IMPL_ISUPPORTS(nsWindowMediator,
nsIWindowMediator_44,
nsIWindowMediator,
nsIObserver,
nsISupportsWeakReference)
NS_IMETHODIMP
nsWindowMediator::AddListener(nsIWindowMediatorListener* aListener)
{
NS_ENSURE_ARG_POINTER(aListener);
mListeners.AppendElement(aListener);
return NS_OK;
}
NS_IMETHODIMP
nsWindowMediator::RemoveListener(nsIWindowMediatorListener* aListener)
{
NS_ENSURE_ARG_POINTER(aListener);
mListeners.RemoveElement(aListener);
return NS_OK;
}
NS_IMETHODIMP
nsWindowMediator::Observe(nsISupports* aSubject,
const char* aTopic,
const char16_t* aData)
{
if (!strcmp(aTopic, "xpcom-shutdown") && mReady) {
MOZ_RELEASE_ASSERT(NS_IsMainThread());
while (mOldestWindow)
UnregisterWindow(mOldestWindow);
mReady = false;
}
return NS_OK;
}
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