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112 lines
4.5 KiB
C++
112 lines
4.5 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
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*
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* The contents of this file are subject to the Netscape Public
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* License Version 1.1 (the "License"); you may not use this file
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* except in compliance with the License. You may obtain a copy of
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* the License at http://www.mozilla.org/NPL/
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*
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* Software distributed under the License is distributed on an "AS
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* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
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* implied. See the License for the specific language governing
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* rights and limitations under the License.
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*
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* The Original Code is mozilla.org code.
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*
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* The Initial Developer of the Original Code is Netscape
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* Communications Corporation. Portions created by Netscape are
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* Copyright (C) 2001 Netscape Communications Corporation. All
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* Rights Reserved.
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*
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* Contributor(s):
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*/
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/* There are several ways to open a new window in Mozilla: directly, using
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nsAppShellService; indirectly, using the Open method on an extant
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window, the OpenWindow method on the nsWindowWatcher service, and this
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WindowCreator. I think that's all of them, for petessake. But
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the conditions under which each should be used are definite, if
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not clear, and there is no overlap.
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Basically, you should never use nsAppShellService. That's the basic
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method that all others boil down to, and it creates partially initialized
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windows. Trust the other means of opening windows to use nsAppShellService
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and then finish the new window's initialization. nsAppShellService is
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also strictly a Mozilla-only service; it's unavailable (or should be)
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to embedding apps. So it's not merely inadvisable but also illegal
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for any code that may execute in an embedding context to use that service.
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Unless you're writing window opening code yourself, you want to use
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the Open method on an extant window, or lacking one of those, the
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OpenWindow method on the nsWindowWatcher service. (The former calls
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through to the latter.) Both methods are equally at home in Mozilla
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and embedding contexts. They differentiate between which kind of window
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to open in different ways, depending on whether there is an extant
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window.
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Lacking an extant window, it's this object, the nsWindowCreator,
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that allows new window creation and properly distinguishes between
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Mozilla and embedding contexts. This source file contains the
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Mozilla version, which calls through to nsAppShellService.
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*/
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#include "nsCOMPtr.h"
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#include "nsAppShellCIDs.h"
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#include "nsIAppShellService.h"
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#include "nsIInterfaceRequestor.h"
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#include "nsIServiceManager.h"
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#include "nsIXULWindow.h"
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#include "nsIWebBrowserChrome.h"
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#include "nsWindowCreator.h"
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static NS_DEFINE_CID(kAppShellServiceCID, NS_APPSHELL_SERVICE_CID);
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nsWindowCreator::nsWindowCreator() {
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NS_INIT_REFCNT();
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}
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nsWindowCreator::~nsWindowCreator() {
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}
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NS_IMPL_ISUPPORTS1(nsWindowCreator, nsIWindowCreator)
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NS_IMETHODIMP
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nsWindowCreator::CreateChromeWindow(nsIWebBrowserChrome *aParent,
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PRUint32 aChromeFlags,
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nsIWebBrowserChrome **_retval)
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{
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NS_ENSURE_ARG_POINTER(_retval);
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*_retval = 0;
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/* There is no valid way to get from an nsIWebBrowserChrome interface
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to the corresponding nsXULWindow, so we can't really service a request
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to make a window with a parent. This shouldn't be a problem, since
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convention suggests this method only be used when there is no parent
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window (otherwise, just call Open() on the parent). However, we
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should say something, just to be sure: */
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NS_ASSERTION(!aParent, "window creator reached with non-null parent");
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if (aParent)
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return NS_ERROR_INVALID_ARG;
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/* And you really shouldn't be making dependent windows without a parent.
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But unparented modal (and therefore dependent) windows happen
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in our codebase, so we allow it after some bellyaching: */
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if (aChromeFlags & nsIWebBrowserChrome::CHROME_DEPENDENT)
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NS_WARNING("dependent window created without a parent");
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nsCOMPtr<nsIAppShellService> appShell(do_GetService(kAppShellServiceCID));
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if (!appShell)
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return NS_ERROR_FAILURE;
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nsCOMPtr<nsIXULWindow> newWindow;
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appShell->CreateTopLevelWindow(0, 0, PR_FALSE, PR_FALSE,
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aChromeFlags, NS_SIZETOCONTENT, NS_SIZETOCONTENT,
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getter_AddRefs(newWindow));
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nsCOMPtr<nsIInterfaceRequestor> thing(do_QueryInterface(newWindow));
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if (thing)
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thing->GetInterface(NS_GET_IID(nsIWebBrowserChrome), (void **) _retval);
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return *_retval ? NS_OK : NS_ERROR_FAILURE;
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}
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