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// Copyright (c) 2012 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.
#ifndef CHROME_BROWSER_UI_UNLOAD_CONTROLLER_H_
#define CHROME_BROWSER_UI_UNLOAD_CONTROLLER_H_
#include <set>
#include "base/callback.h"
#include "base/memory/weak_ptr.h"
#include "chrome/browser/ui/tabs/tab_strip_model_observer.h"
#include "content/public/browser/notification_observer.h"
#include "content/public/browser/notification_registrar.h"
class Browser;
class TabStripModel;
namespace content {
class NotificationSource;
class NotifictaionDetails;
class WebContents;
}
namespace chrome {
class UnloadController : public content::NotificationObserver,
public TabStripModelObserver {
public:
explicit UnloadController(Browser* browser);
virtual ~UnloadController();
// Returns true if |contents| can be cleanly closed. When |browser_| is being
// closed, this function will return false to indicate |contents| should not
// be cleanly closed, since the fast shutdown path will just kill its
// renderer.
bool CanCloseContents(content::WebContents* contents);
// Returns true if we need to run unload events for the |contents|.
static bool ShouldRunUnloadEventsHelper(content::WebContents* contents);
// Helper function to run beforeunload listeners on a WebContents.
// Returns true if |contents| beforeunload listeners were invoked.
static bool RunUnloadEventsHelper(content::WebContents* contents);
// Called when a BeforeUnload handler is fired for |contents|. |proceed|
// indicates the user's response to the Y/N BeforeUnload handler dialog. If
// this parameter is false, any pending attempt to close the whole browser
// will be canceled. Returns true if Unload handlers should be fired. When the
// |browser_| is being closed, Unload handlers for any particular WebContents
// will not be run until every WebContents being closed has a chance to run
// its BeforeUnloadHandler.
bool BeforeUnloadFired(content::WebContents* contents, bool proceed);
bool is_attempting_to_close_browser() const {
return is_attempting_to_close_browser_;
}
// Called in response to a request to close |browser_|'s window. Returns true
// when there are no remaining beforeunload handlers to be run.
bool ShouldCloseWindow();
// Begins the process of confirming whether the associated browser can be
// closed.
bool CallBeforeUnloadHandlers(
const base::Callback<void(bool)>& on_close_confirmed);
// Clears the results of any beforeunload confirmation dialogs triggered by a
// CallBeforeUnloadHandlers call.
void ResetBeforeUnloadHandlers();
// Returns true if |browser_| has any tabs that have BeforeUnload handlers
// that have not been fired. This method is non-const because it builds a list
// of tabs that need their BeforeUnloadHandlers fired.
// TODO(beng): This seems like it could be private but it is used by
// AreAllBrowsersCloseable() in application_lifetime.cc. It seems
// very similar to ShouldCloseWindow() and some consolidation
// could be pursued.
bool TabsNeedBeforeUnloadFired();
private:
typedef std::set<content::WebContents*> UnloadListenerSet;
// Overridden from content::NotificationObserver:
virtual void Observe(int type,
const content::NotificationSource& source,
const content::NotificationDetails& details) OVERRIDE;
// Overridden from TabStripModelObserver:
virtual void TabInsertedAt(content::WebContents* contents,
int index,
bool foreground) OVERRIDE;
virtual void TabDetachedAt(content::WebContents* contents,
int index) OVERRIDE;
virtual void TabReplacedAt(TabStripModel* tab_strip_model,
content::WebContents* old_contents,
content::WebContents* new_contents,
int index) OVERRIDE;
virtual void TabStripEmpty() OVERRIDE;
void TabAttachedImpl(content::WebContents* contents);
void TabDetachedImpl(content::WebContents* contents);
// Processes the next tab that needs it's beforeunload/unload event fired.
void ProcessPendingTabs();
// Whether we've completed firing all the tabs' beforeunload/unload events.
bool HasCompletedUnloadProcessing() const;
// Clears all the state associated with processing tabs' beforeunload/unload
// events since the user cancelled closing the window.
void CancelWindowClose();
// Removes |web_contents| from the passed |set|.
// Returns whether the tab was in the set in the first place.
bool RemoveFromSet(UnloadListenerSet* set,
content::WebContents* web_contents);
// Cleans up state appropriately when we are trying to close the browser and
// the tab has finished firing its unload handler. We also use this in the
// cases where a tab crashes or hangs even if the beforeunload/unload haven't
// successfully fired. If |process_now| is true |ProcessPendingTabs| is
// invoked immediately, otherwise it is invoked after a delay (PostTask).
//
// Typically you'll want to pass in true for |process_now|. Passing in true
// may result in deleting |tab|. If you know that shouldn't happen (because of
// the state of the stack), pass in false.
void ClearUnloadState(content::WebContents* web_contents, bool process_now);
bool is_calling_before_unload_handlers() {
return !on_close_confirmed_.is_null();
}
Browser* browser_;
content::NotificationRegistrar registrar_;
// Tracks tabs that need there beforeunload event fired before we can
// close the browser. Only gets populated when we try to close the browser.
UnloadListenerSet tabs_needing_before_unload_fired_;
// Tracks tabs that need there unload event fired before we can
// close the browser. Only gets populated when we try to close the browser.
UnloadListenerSet tabs_needing_unload_fired_;
// Whether we are processing the beforeunload and unload events of each tab
// in preparation for closing the browser. UnloadController owns this state
// rather than Browser because unload handlers are the only reason that a
// Browser window isn't just immediately closed.
bool is_attempting_to_close_browser_;
// A callback to call to report whether the user chose to close all tabs of
// |browser_| that have beforeunload event handlers. This is set only if we
// are currently confirming that the browser is closable.
base::Callback<void(bool)> on_close_confirmed_;
base::WeakPtrFactory<UnloadController> weak_factory_;
DISALLOW_COPY_AND_ASSIGN(UnloadController);
};
} // namespace chrome
#endif // CHROME_BROWSER_UI_UNLOAD_CONTROLLER_H_
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