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// Copyright (c) 2013 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_BROWSER_ITERATOR_H_
#define CHROME_BROWSER_UI_BROWSER_ITERATOR_H_
#include "chrome/browser/ui/browser_list.h"
#include "chrome/browser/ui/host_desktop.h"
class Browser;
namespace chrome {
// Iterates over all existing browsers (potentially across multiple desktops).
// Note: to iterate only over the browsers of a specific desktop, use the
// const_iterator of a given BrowserList instead.
//
// Example:
// for (BrowserIterator iterator; !iterator.done(); iterator.Next()) {
// Browser* cur = *iterator;
// -or-
// iterator->OperationOnBrowser();
// ...
// }
class BrowserIterator {
public:
BrowserIterator();
~BrowserIterator();
// Returns true if this iterator is past the last Browser.
bool done() const {
// |current_iterator_| is never at the end of a list unless it is done (it
// immediately moves to the next browser list upon hitting the end of the
// current list unless there are no remaining empty browser lists).
return current_iterator_ == current_browser_list_->end();
}
// Returns the current Browser, valid as long as !done().
Browser* operator->() const {
return *current_iterator_;
}
Browser* operator*() const {
return *current_iterator_;
}
// Advances |current_iterator_| to the next browser.
void Next();
private:
// If |current_iterator_| is at |current_browser_list_->end()|, advance to the
// next non-empty browser list. After a call to this method: either
// |current_iterator_| is valid or done().
void NextBrowserListIfAtEnd();
// The BrowserList currently being iterated over. Instances of this class do
// not own this pointer.
BrowserList* current_browser_list_;
// The underlying iterator over browsers in |current_browser_list_|.
BrowserList::const_iterator current_iterator_;
// The next HostDesktopType to iterate over when |current_iterator_| reaches
// |current_browser_list_->end()|.
HostDesktopType next_desktop_type_;
DISALLOW_COPY_AND_ASSIGN(BrowserIterator);
};
} // namespace chrome
#endif // CHROME_BROWSER_UI_BROWSER_ITERATOR_H_
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