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// Copyright (c) 2010 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "chrome/browser/chromeos/tab_closeable_state_watcher.h"
#include "chrome/browser/defaults.h"
#include "chrome/browser/profile.h"
#include "chrome/browser/tab_contents/tab_contents.h"
#include "chrome/browser/tab_contents/tab_contents_view.h"
#include "chrome/common/notification_service.h"
#include "chrome/common/url_constants.h"
namespace chromeos {
////////////////////////////////////////////////////////////////////////////////
// TabCloseableStateWatcher::TabStripWatcher, public:
TabCloseableStateWatcher::TabStripWatcher::TabStripWatcher(
TabCloseableStateWatcher* main_watcher, const Browser* browser)
: main_watcher_(main_watcher),
browser_(browser) {
browser_->tabstrip_model()->AddObserver(this);
}
TabCloseableStateWatcher::TabStripWatcher::~TabStripWatcher() {
browser_->tabstrip_model()->RemoveObserver(this);
}
////////////////////////////////////////////////////////////////////////////////
// TabCloseableStateWatcher::TabStripWatcher,
// TabStripModelObserver implementation:
void TabCloseableStateWatcher::TabStripWatcher::TabInsertedAt(
TabContents* tab_contents, int index, bool foreground) {
main_watcher_->OnTabStripChanged(browser_, false);
}
void TabCloseableStateWatcher::TabStripWatcher::TabClosingAt(
TabContents* tab_contents, int index) {
TabStripModel* tabstrip = browser_->tabstrip_model();
if ((!browser_defaults::kPhantomTabsEnabled && tabstrip->count() == 1) ||
(browser_defaults::kPhantomTabsEnabled &&
tabstrip->GetNonPhantomTabCount() == 1 &&
!tabstrip->IsTabPinned(index))) {
// Closing last tab.
main_watcher_->OnTabStripChanged(browser_, true);
}
}
void TabCloseableStateWatcher::TabStripWatcher::TabDetachedAt(
TabContents* tab_contents, int index) {
main_watcher_->OnTabStripChanged(browser_, false);
}
void TabCloseableStateWatcher::TabStripWatcher::TabChangedAt(
TabContents* tab_contents, int index, TabChangeType change_type) {
main_watcher_->OnTabStripChanged(browser_, false);
}
////////////////////////////////////////////////////////////////////////////////
// TabCloseableStateWatcher, public:
TabCloseableStateWatcher::TabCloseableStateWatcher()
: can_close_tab_(true),
signing_off_(false) {
BrowserList::AddObserver(this);
notification_registrar_.Add(this, NotificationType::APP_EXITING,
NotificationService::AllSources());
}
TabCloseableStateWatcher::~TabCloseableStateWatcher() {
BrowserList::RemoveObserver(this);
DCHECK(tabstrip_watchers_.empty());
}
bool TabCloseableStateWatcher::CanCloseTab(const Browser* browser) const {
return browser->type() != Browser::TYPE_NORMAL ? true : can_close_tab_;
}
bool TabCloseableStateWatcher::CanCloseBrowser(Browser* browser) {
BrowserActionType action_type;
bool can_close = CanCloseBrowserImpl(browser, &action_type);
if (action_type == OPEN_WINDOW) {
browser->NewWindow();
} else if (action_type == OPEN_NTP) {
// NTP will be opened before closing last tab (via TabStripModelObserver::
// TabClosingAt), close all tabs now.
browser->CloseAllTabs();
}
return can_close;
}
void TabCloseableStateWatcher::OnWindowCloseCanceled(Browser* browser) {
// This could be a call to cancel APP_EXITING if user doesn't proceed with
// unloading handler.
if (signing_off_) {
signing_off_ = false;
CheckAndUpdateState(browser);
}
}
////////////////////////////////////////////////////////////////////////////////
// TabCloseableStateWatcher, BrowserList::Observer implementation:
void TabCloseableStateWatcher::OnBrowserAdded(const Browser* browser) {
// Only normal browsers may affect closeable state.
if (browser->type() != Browser::TYPE_NORMAL)
return;
// Create TabStripWatcher to observe tabstrip of new browser.
tabstrip_watchers_.push_back(new TabStripWatcher(this, browser));
// When a normal browser is just added, there's no tabs yet, so we wait till
// TabInsertedAt notification to check for change in state.
}
void TabCloseableStateWatcher::OnBrowserRemoving(const Browser* browser) {
// Only normal browsers may affect closeable state.
if (browser->type() != Browser::TYPE_NORMAL)
return;
// Remove TabStripWatcher for browser that is being removed.
for (std::vector<TabStripWatcher*>::iterator it = tabstrip_watchers_.begin();
it != tabstrip_watchers_.end(); ++it) {
if ((*it)->browser() == browser) {
delete (*it);
tabstrip_watchers_.erase(it);
break;
}
}
CheckAndUpdateState(NULL);
}
////////////////////////////////////////////////////////////////////////////////
// TabCloseableStateWatcher, NotificationObserver implementation:
void TabCloseableStateWatcher::Observe(NotificationType type,
const NotificationSource& source, const NotificationDetails& details) {
if (type.value != NotificationType::APP_EXITING)
NOTREACHED();
if (!signing_off_) {
signing_off_ = true;
SetCloseableState(true);
}
}
////////////////////////////////////////////////////////////////////////////////
// TabCloseableStateWatcher, private
void TabCloseableStateWatcher::OnTabStripChanged(const Browser* browser,
bool closing_last_tab) {
if (!closing_last_tab) {
CheckAndUpdateState(browser);
return;
}
// Before closing last tab, open new window or NTP if necessary.
BrowserActionType action_type;
CanCloseBrowserImpl(browser, &action_type);
if (action_type != NONE) {
Browser* mutable_browser = const_cast<Browser*>(browser);
if (action_type == OPEN_WINDOW)
mutable_browser->NewWindow();
else if (action_type == OPEN_NTP)
mutable_browser->NewTab();
}
}
void TabCloseableStateWatcher::CheckAndUpdateState(
const Browser* browser_to_check) {
// We shouldn't update state if we're signing off, or there's no normal
// browser, or browser is always closeable.
if (signing_off_ || tabstrip_watchers_.empty() ||
(browser_to_check && browser_to_check->type() != Browser::TYPE_NORMAL))
return;
bool new_can_close;
if (tabstrip_watchers_.size() > 1) {
new_can_close = true;
} else { // There's only 1 normal browser.
if (!browser_to_check)
browser_to_check = tabstrip_watchers_[0]->browser();
if (browser_to_check->profile()->IsOffTheRecord()) {
new_can_close = true;
} else {
TabStripModel* tabstrip_model = browser_to_check->tabstrip_model();
// If NTP is the only non-phantom tab, it's not closeable.
if (tabstrip_model->GetNonPhantomTabCount() == 1) {
int first_non_phantom_tab = tabstrip_model->IndexOfFirstNonPhantomTab();
new_can_close =
tabstrip_model->GetTabContentsAt(first_non_phantom_tab)->GetURL() !=
GURL(chrome::kChromeUINewTabURL); // Tab is not NewTabPage.
} else {
new_can_close = true;
}
}
}
SetCloseableState(new_can_close);
}
void TabCloseableStateWatcher::SetCloseableState(bool closeable) {
if (can_close_tab_ == closeable) // No change in state.
return;
can_close_tab_ = closeable;
// Notify of change in tab closeable state.
NotificationService::current()->Notify(
NotificationType::TAB_CLOSEABLE_STATE_CHANGED,
NotificationService::AllSources(),
Details<bool>(&can_close_tab_));
}
bool TabCloseableStateWatcher::CanCloseBrowserImpl(const Browser* browser,
BrowserActionType* action_type) const {
*action_type = NONE;
// Browser is always closeable when signing off.
if (signing_off_)
return true;
// Non-normal browsers are always closeable.
if (browser->type() != Browser::TYPE_NORMAL)
return true;
// If this is not the last normal browser, it's always closeable.
if (tabstrip_watchers_.size() > 1)
return true;
// If last normal browser is incognito, open a non-incognito window,
// and allow closing of incognito one.
if (browser->profile()->IsOffTheRecord()) {
*action_type = OPEN_WINDOW;
return true;
}
// If tab is not closeable, browser is not closeable.
if (!can_close_tab_)
return false;
// Otherwise, close existing tabs, and deny closing of browser.
// TabClosingAt will open NTP when the last tab is being closed.
*action_type = OPEN_NTP;
return false;
}
} // namespace chromeos
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