gecko-dev/dom/base/nsHistory.cpp

326 строки
7.9 KiB
C++

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=2 sw=2 et tw=78: */
/* 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 "nsHistory.h"
#include "jsapi.h"
#include "mozilla/dom/HistoryBinding.h"
#include "nsCOMPtr.h"
#include "nsPIDOMWindow.h"
#include "nsIDocument.h"
#include "nsIPresShell.h"
#include "nsPresContext.h"
#include "nsIDocShell.h"
#include "nsIWebNavigation.h"
#include "nsIURI.h"
#include "nsIInterfaceRequestorUtils.h"
#include "nsReadableUtils.h"
#include "nsContentUtils.h"
#include "nsISHistory.h"
#include "nsISHistoryInternal.h"
#include "mozilla/Preferences.h"
using namespace mozilla;
using namespace mozilla::dom;
static const char* sAllowPushStatePrefStr =
"browser.history.allowPushState";
static const char* sAllowReplaceStatePrefStr =
"browser.history.allowReplaceState";
//
// History class implementation
//
NS_IMPL_CYCLE_COLLECTION_WRAPPERCACHE_0(nsHistory)
NS_IMPL_CYCLE_COLLECTING_ADDREF(nsHistory)
NS_IMPL_CYCLE_COLLECTING_RELEASE(nsHistory)
NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(nsHistory)
NS_WRAPPERCACHE_INTERFACE_MAP_ENTRY
NS_INTERFACE_MAP_ENTRY(nsISupports)
NS_INTERFACE_MAP_ENTRY(nsIDOMHistory) // Empty, needed for extension compat
NS_INTERFACE_MAP_END
nsHistory::nsHistory(nsPIDOMWindow* aInnerWindow)
: mInnerWindow(do_GetWeakReference(aInnerWindow))
{
}
nsHistory::~nsHistory()
{
}
nsPIDOMWindow*
nsHistory::GetParentObject() const
{
nsCOMPtr<nsPIDOMWindow> win(do_QueryReferent(mInnerWindow));
return win;
}
JSObject*
nsHistory::WrapObject(JSContext* aCx, JS::Handle<JSObject*> aGivenProto)
{
return HistoryBinding::Wrap(aCx, this, aGivenProto);
}
uint32_t
nsHistory::GetLength(ErrorResult& aRv) const
{
nsCOMPtr<nsPIDOMWindow> win(do_QueryReferent(mInnerWindow));
if (!win || !win->HasActiveDocument()) {
aRv.Throw(NS_ERROR_DOM_SECURITY_ERR);
return 0;
}
// Get session History from docshell
nsCOMPtr<nsISHistory> sHistory = GetSessionHistory();
if (!sHistory) {
aRv.Throw(NS_ERROR_FAILURE);
return 0;
}
int32_t len;
nsresult rv = sHistory->GetCount(&len);
if (NS_FAILED(rv)) {
aRv.Throw(rv);
return 0;
}
return len >= 0 ? len : 0;
}
void
nsHistory::GetState(JSContext* aCx, JS::MutableHandle<JS::Value> aResult,
ErrorResult& aRv) const
{
nsCOMPtr<nsPIDOMWindow> win(do_QueryReferent(mInnerWindow));
if (!win) {
aRv.Throw(NS_ERROR_NOT_AVAILABLE);
return;
}
if (!win->HasActiveDocument()) {
aRv.Throw(NS_ERROR_DOM_SECURITY_ERR);
return;
}
nsCOMPtr<nsIDocument> doc =
do_QueryInterface(win->GetExtantDoc());
if (!doc) {
aRv.Throw(NS_ERROR_NOT_AVAILABLE);
return;
}
nsCOMPtr<nsIVariant> variant;
doc->GetStateObject(getter_AddRefs(variant));
if (variant) {
aRv = variant->GetAsJSVal(aResult);
if (aRv.Failed()) {
return;
}
if (!JS_WrapValue(aCx, aResult)) {
aRv.Throw(NS_ERROR_OUT_OF_MEMORY);
}
return;
}
aResult.setNull();
}
void
nsHistory::Go(int32_t aDelta, ErrorResult& aRv)
{
nsCOMPtr<nsPIDOMWindow> win(do_QueryReferent(mInnerWindow));
if (!win || !win->HasActiveDocument()) {
aRv.Throw(NS_ERROR_DOM_SECURITY_ERR);
return;
}
if (!aDelta) {
nsCOMPtr<nsPIDOMWindow> window;
if (nsIDocShell* docShell = GetDocShell()) {
window = docShell->GetWindow();
}
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 = window->GetExtantDoc();
nsIPresShell *shell;
nsPresContext *pcx;
if (doc && (shell = doc->GetShell()) && (pcx = shell->GetPresContext())) {
pcx->RebuildAllStyleData(NS_STYLE_HINT_REFLOW, eRestyle_Subtree);
}
return;
}
}
nsCOMPtr<nsISHistory> session_history = GetSessionHistory();
nsCOMPtr<nsIWebNavigation> webnav(do_QueryInterface(session_history));
if (!webnav) {
aRv.Throw(NS_ERROR_FAILURE);
return;
}
int32_t curIndex = -1;
int32_t len = 0;
session_history->GetIndex(&curIndex);
session_history->GetCount(&len);
int32_t index = curIndex + aDelta;
if (index > -1 && index < len)
webnav->GotoIndex(index);
// Ignore the return value from GotoIndex(), since returning errors
// from GotoIndex() can lead to exceptions and a possible leak
// of history length
}
void
nsHistory::Back(ErrorResult& aRv)
{
nsCOMPtr<nsPIDOMWindow> win(do_QueryReferent(mInnerWindow));
if (!win || !win->HasActiveDocument()) {
aRv.Throw(NS_ERROR_DOM_SECURITY_ERR);
return;
}
nsCOMPtr<nsISHistory> sHistory = GetSessionHistory();
nsCOMPtr<nsIWebNavigation> webNav(do_QueryInterface(sHistory));
if (!webNav) {
aRv.Throw(NS_ERROR_FAILURE);
return;
}
webNav->GoBack();
}
void
nsHistory::Forward(ErrorResult& aRv)
{
nsCOMPtr<nsPIDOMWindow> win(do_QueryReferent(mInnerWindow));
if (!win || !win->HasActiveDocument()) {
aRv.Throw(NS_ERROR_DOM_SECURITY_ERR);
return;
}
nsCOMPtr<nsISHistory> sHistory = GetSessionHistory();
nsCOMPtr<nsIWebNavigation> webNav(do_QueryInterface(sHistory));
if (!webNav) {
aRv.Throw(NS_ERROR_FAILURE);
return;
}
webNav->GoForward();
}
void
nsHistory::PushState(JSContext* aCx, JS::Handle<JS::Value> aData,
const nsAString& aTitle, const nsAString& aUrl,
ErrorResult& aRv)
{
PushOrReplaceState(aCx, aData, aTitle, aUrl, aRv, false);
}
void
nsHistory::ReplaceState(JSContext* aCx, JS::Handle<JS::Value> aData,
const nsAString& aTitle, const nsAString& aUrl,
ErrorResult& aRv)
{
PushOrReplaceState(aCx, aData, aTitle, aUrl, aRv, true);
}
void
nsHistory::PushOrReplaceState(JSContext* aCx, JS::Handle<JS::Value> aData,
const nsAString& aTitle, const nsAString& aUrl,
ErrorResult& aRv, bool aReplace)
{
nsCOMPtr<nsPIDOMWindow> win(do_QueryReferent(mInnerWindow));
if (!win) {
aRv.Throw(NS_ERROR_NOT_AVAILABLE);
return;
}
if (!win->HasActiveDocument()) {
aRv.Throw(NS_ERROR_DOM_SECURITY_ERR);
return;
}
// Check that PushState hasn't been pref'ed off.
if (!Preferences::GetBool(aReplace ? sAllowReplaceStatePrefStr :
sAllowPushStatePrefStr, false)) {
return;
}
// 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 = win->GetDocShell();
if (!docShell) {
aRv.Throw(NS_ERROR_FAILURE);
return;
}
// The "replace" argument tells the docshell to whether to add a new
// history entry or modify the current one.
aRv = docShell->AddState(aData, aTitle, aUrl, aReplace, aCx);
}
nsIDocShell*
nsHistory::GetDocShell() const
{
nsCOMPtr<nsPIDOMWindow> win = do_QueryReferent(mInnerWindow);
if (!win) {
return nullptr;
}
return win->GetDocShell();
}
already_AddRefed<nsISHistory>
nsHistory::GetSessionHistory() const
{
nsIDocShell *docShell = GetDocShell();
NS_ENSURE_TRUE(docShell, nullptr);
// Get the root DocShell from it
nsCOMPtr<nsIDocShellTreeItem> root;
docShell->GetSameTypeRootTreeItem(getter_AddRefs(root));
nsCOMPtr<nsIWebNavigation> webNav(do_QueryInterface(root));
NS_ENSURE_TRUE(webNav, nullptr);
nsCOMPtr<nsISHistory> shistory;
// Get SH from nsIWebNavigation
webNav->GetSessionHistory(getter_AddRefs(shistory));
return shistory.forget();
}