gecko/dom/base/nsHistory.cpp

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is mozilla.org code.
*
* The Initial Developer of the Original Code is
* Netscape Communications Corporation.
* Portions created by the Initial Developer are Copyright (C) 1998
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Travis Bogard <travis@netscape.com>
*
* Alternatively, the contents of this file may be used under the terms of
* either of the GNU General Public License Version 2 or later (the "GPL"),
* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
#include "nsCOMPtr.h"
#include "nscore.h"
#include "nsHistory.h"
#include "nsIDOMWindowInternal.h"
#include "nsPIDOMWindow.h"
#include "nsIScriptGlobalObject.h"
#include "nsIDOMDocument.h"
#include "nsIDocument.h"
#include "nsIPresShell.h"
#include "nsPresContext.h"
#include "nsIDocShell.h"
#include "nsIDocShellTreeItem.h"
#include "nsIWebNavigation.h"
#include "nsIHistoryEntry.h"
#include "nsIURI.h"
#include "nsIServiceManager.h"
#include "nsIInterfaceRequestorUtils.h"
#include "nsXPIDLString.h"
#include "nsReadableUtils.h"
#include "nsDOMClassInfo.h"
#include "nsContentUtils.h"
#include "nsIDOMNSDocument.h"
#include "nsISHistoryInternal.h"
static const char* sAllowPushStatePrefStr =
"browser.history.allowPushState";
static const char* sAllowReplaceStatePrefStr =
"browser.history.allowReplaceState";
//
// History class implementation
//
nsHistory::nsHistory(nsIDocShell* aDocShell) : mDocShell(aDocShell)
{
}
nsHistory::~nsHistory()
{
}
DOMCI_DATA(History, nsHistory)
// QueryInterface implementation for nsHistory
NS_INTERFACE_MAP_BEGIN(nsHistory)
NS_INTERFACE_MAP_ENTRY_AMBIGUOUS(nsISupports, nsIDOMHistory)
NS_INTERFACE_MAP_ENTRY(nsIDOMHistory)
NS_DOM_INTERFACE_MAP_ENTRY_CLASSINFO(History)
NS_INTERFACE_MAP_END
NS_IMPL_ADDREF(nsHistory)
NS_IMPL_RELEASE(nsHistory)
void
nsHistory::SetDocShell(nsIDocShell *aDocShell)
{
mDocShell = aDocShell; // Weak Reference
}
NS_IMETHODIMP
nsHistory::GetLength(PRInt32* aLength)
{
nsCOMPtr<nsISHistory> sHistory;
// Get session History from docshell
GetSessionHistoryFromDocShell(mDocShell, getter_AddRefs(sHistory));
NS_ENSURE_TRUE(sHistory, NS_ERROR_FAILURE);
return sHistory->GetCount(aLength);
}
NS_IMETHODIMP
nsHistory::GetCurrent(nsAString& aCurrent)
{
PRInt32 curIndex=0;
nsCAutoString curURL;
nsCOMPtr<nsISHistory> sHistory;
// Get SessionHistory from docshell
GetSessionHistoryFromDocShell(mDocShell, getter_AddRefs(sHistory));
NS_ENSURE_TRUE(sHistory, NS_ERROR_FAILURE);
// Get the current index at session History
sHistory->GetIndex(&curIndex);
nsCOMPtr<nsIHistoryEntry> curEntry;
nsCOMPtr<nsIURI> uri;
// Get the SH entry for the current index
sHistory->GetEntryAtIndex(curIndex, PR_FALSE, getter_AddRefs(curEntry));
NS_ENSURE_TRUE(curEntry, NS_ERROR_FAILURE);
// Get the URI for the current entry
curEntry->GetURI(getter_AddRefs(uri));
NS_ENSURE_TRUE(uri, NS_ERROR_FAILURE);
uri->GetSpec(curURL);
CopyUTF8toUTF16(curURL, aCurrent);
return NS_OK;
}
NS_IMETHODIMP
nsHistory::GetPrevious(nsAString& aPrevious)
{
PRInt32 curIndex;
nsCAutoString prevURL;
nsCOMPtr<nsISHistory> sHistory;
// Get session History from docshell
GetSessionHistoryFromDocShell(mDocShell, getter_AddRefs(sHistory));
NS_ENSURE_TRUE(sHistory, NS_ERROR_FAILURE);
// Get the current index at session History
sHistory->GetIndex(&curIndex);
nsCOMPtr<nsIHistoryEntry> prevEntry;
nsCOMPtr<nsIURI> uri;
// Get the previous SH entry
sHistory->GetEntryAtIndex((curIndex-1), PR_FALSE, getter_AddRefs(prevEntry));
NS_ENSURE_TRUE(prevEntry, NS_ERROR_FAILURE);
// Get the URI for the previous entry
prevEntry->GetURI(getter_AddRefs(uri));
NS_ENSURE_TRUE(uri, NS_ERROR_FAILURE);
uri->GetSpec(prevURL);
CopyUTF8toUTF16(prevURL, aPrevious);
return NS_OK;
}
NS_IMETHODIMP
nsHistory::GetNext(nsAString& aNext)
{
PRInt32 curIndex;
nsCAutoString nextURL;
nsCOMPtr<nsISHistory> sHistory;
// Get session History from docshell
GetSessionHistoryFromDocShell(mDocShell, getter_AddRefs(sHistory));
NS_ENSURE_TRUE(sHistory, NS_ERROR_FAILURE);
// Get the current index at session History
sHistory->GetIndex(&curIndex);
nsCOMPtr<nsIHistoryEntry> nextEntry;
nsCOMPtr<nsIURI> uri;
// Get the next SH entry
sHistory->GetEntryAtIndex((curIndex+1), PR_FALSE, getter_AddRefs(nextEntry));
NS_ENSURE_TRUE(nextEntry, NS_ERROR_FAILURE);
// Get the URI for the next entry
nextEntry->GetURI(getter_AddRefs(uri));
NS_ENSURE_TRUE(uri, NS_ERROR_FAILURE);
uri->GetSpec(nextURL);
CopyUTF8toUTF16(nextURL, aNext);
return NS_OK;
}
NS_IMETHODIMP
nsHistory::Back()
{
nsCOMPtr<nsISHistory> sHistory;
GetSessionHistoryFromDocShell(mDocShell, getter_AddRefs(sHistory));
NS_ENSURE_TRUE(sHistory, NS_ERROR_FAILURE);
//QI SHistory to WebNavigation
nsCOMPtr<nsIWebNavigation> webNav(do_QueryInterface(sHistory));
NS_ENSURE_TRUE(webNav, NS_ERROR_FAILURE);
webNav->GoBack();
return NS_OK;
}
NS_IMETHODIMP
nsHistory::Forward()
{
nsCOMPtr<nsISHistory> sHistory;
GetSessionHistoryFromDocShell(mDocShell, getter_AddRefs(sHistory));
NS_ENSURE_TRUE(sHistory, NS_ERROR_FAILURE);
//QI SHistory to WebNavigation
nsCOMPtr<nsIWebNavigation> webNav(do_QueryInterface(sHistory));
NS_ENSURE_TRUE(webNav, NS_ERROR_FAILURE);
webNav->GoForward();
return NS_OK;
}
NS_IMETHODIMP
nsHistory::Go(PRInt32 aDelta)
{
if (aDelta == 0) {
nsCOMPtr<nsPIDOMWindow> window(do_GetInterface(mDocShell));
if (window && window->IsHandlingResizeEvent()) {
// history.go(0) (aka location.reload()) was called on a window
// that is handling a resize event. Sites do this since Netscape
// 4.x needed it, but we don't, and it's a horrible experience
// for nothing. In stead of reloading the page, just clear
// style data and reflow the page since some sites may use this
// trick to work around gecko reflow bugs, and this should have
// the same effect.
nsCOMPtr<nsIDocument> doc =
do_QueryInterface(window->GetExtantDocument());
nsIPresShell *shell;
nsPresContext *pcx;
if (doc && (shell = doc->GetPrimaryShell()) &&
(pcx = shell->GetPresContext())) {
pcx->RebuildAllStyleData(NS_STYLE_HINT_REFLOW);
}
return NS_OK;
}
}
nsCOMPtr<nsISHistory> session_history;
GetSessionHistoryFromDocShell(mDocShell, getter_AddRefs(session_history));
NS_ENSURE_TRUE(session_history, NS_ERROR_FAILURE);
// QI SHistory to nsIWebNavigation
nsCOMPtr<nsIWebNavigation> webnav(do_QueryInterface(session_history));
NS_ENSURE_TRUE(webnav, NS_ERROR_FAILURE);
PRInt32 curIndex=-1;
PRInt32 len = 0;
nsresult rv = session_history->GetIndex(&curIndex);
rv = session_history->GetCount(&len);
PRInt32 index = curIndex + aDelta;
if (index > -1 && index < len)
webnav->GotoIndex(index);
// We always want to return a NS_OK, since returning errors
// from GotoIndex() can lead to exceptions and a possible leak
// of history length
return NS_OK;
}
NS_IMETHODIMP
nsHistory::PushState(nsIVariant *aData, const nsAString& aTitle,
const nsAString& aURL)
{
// Check that PushState hasn't been pref'ed off.
if (!nsContentUtils::GetBoolPref(sAllowPushStatePrefStr, PR_FALSE))
return NS_OK;
NS_ENSURE_TRUE(mDocShell, NS_ERROR_FAILURE);
// AddState might run scripts, so we need to hold a strong reference to the
// docShell here to keep it from going away.
nsCOMPtr<nsIDocShell> docShell = mDocShell;
// PR_FALSE tells the docshell to add a new history entry instead of
// modifying the current one.
nsresult rv = mDocShell->AddState(aData, aTitle, aURL, PR_FALSE);
NS_ENSURE_SUCCESS(rv, rv);
return NS_OK;
}
NS_IMETHODIMP
nsHistory::ReplaceState(nsIVariant *aData, const nsAString& aTitle,
const nsAString& aURL)
{
// Check that ReplaceState hasn't been pref'ed off
if (!nsContentUtils::GetBoolPref(sAllowReplaceStatePrefStr, PR_FALSE))
return NS_OK;
NS_ENSURE_TRUE(mDocShell, NS_ERROR_FAILURE);
// As in PushState(), we need to keep a strong reference to the docShell
// here.
nsCOMPtr<nsIDocShell> docShell = mDocShell;
// PR_TRUE tells the docshell to modify the current SHEntry, rather than
// create a new one.
return mDocShell->AddState(aData, aTitle, aURL, PR_TRUE);
}
NS_IMETHODIMP
nsHistory::Item(PRUint32 aIndex, nsAString& aReturn)
{
aReturn.Truncate();
nsresult rv = NS_OK;
nsCOMPtr<nsISHistory> session_history;
GetSessionHistoryFromDocShell(mDocShell, getter_AddRefs(session_history));
NS_ENSURE_TRUE(session_history, NS_ERROR_FAILURE);
nsCOMPtr<nsIHistoryEntry> sh_entry;
nsCOMPtr<nsIURI> uri;
rv = session_history->GetEntryAtIndex(aIndex, PR_FALSE,
getter_AddRefs(sh_entry));
if (sh_entry) {
rv = sh_entry->GetURI(getter_AddRefs(uri));
}
if (uri) {
nsCAutoString urlCString;
rv = uri->GetSpec(urlCString);
CopyUTF8toUTF16(urlCString, aReturn);
}
return rv;
}
nsresult
nsHistory::GetSessionHistoryFromDocShell(nsIDocShell * aDocShell,
nsISHistory ** aReturn)
{
NS_ENSURE_TRUE(aDocShell, NS_ERROR_FAILURE);
/* The docshell we have may or may not be
* the root docshell. So, get a handle to
* SH from the root docshell
*/
// QI mDocShell to nsIDocShellTreeItem
nsCOMPtr<nsIDocShellTreeItem> dsTreeItem(do_QueryInterface(mDocShell));
NS_ENSURE_TRUE(dsTreeItem, NS_ERROR_FAILURE);
// Get the root DocShell from it
nsCOMPtr<nsIDocShellTreeItem> root;
dsTreeItem->GetSameTypeRootTreeItem(getter_AddRefs(root));
NS_ENSURE_TRUE(root, NS_ERROR_FAILURE);
//QI root to nsIWebNavigation
nsCOMPtr<nsIWebNavigation> webNav(do_QueryInterface(root));
NS_ENSURE_TRUE(webNav, NS_ERROR_FAILURE);
//Get SH from nsIWebNavigation
return webNav->GetSessionHistory(aReturn);
}