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// Copyright 2015 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "chrome/browser/ui/browser_tab_strip_tracker.h"
#include "base/auto_reset.h"
#include "chrome/browser/ui/browser.h"
#include "chrome/browser/ui/browser_list.h"
#include "chrome/browser/ui/browser_tab_strip_tracker_delegate.h"
#include "chrome/browser/ui/tabs/tab_strip_model.h"
BrowserTabStripTracker::BrowserTabStripTracker(
TabStripModelObserver* tab_strip_model_observer,
BrowserTabStripTrackerDelegate* delegate)
: tab_strip_model_observer_(tab_strip_model_observer),
delegate_(delegate),
is_processing_initial_browsers_(false) {
DCHECK(tab_strip_model_observer_);
}
BrowserTabStripTracker::~BrowserTabStripTracker() {
// Per ObserverList::RemoveObserver() documentation, this does nothing if the
// observer is not in the ObserverList (i.e. if |browser| is not tracked).
for (auto* browser : *BrowserList::GetInstance())
browser->tab_strip_model()->RemoveObserver(tab_strip_model_observer_);
BrowserList::RemoveObserver(this);
}
void BrowserTabStripTracker::Init() {
BrowserList::AddObserver(this);
base::AutoReset<bool> resetter(&is_processing_initial_browsers_, true);
for (auto* browser : *BrowserList::GetInstance())
MaybeTrackBrowser(browser);
}
bool BrowserTabStripTracker::ShouldTrackBrowser(Browser* browser) {
return !delegate_ || delegate_->ShouldTrackBrowser(browser);
}
void BrowserTabStripTracker::MaybeTrackBrowser(Browser* browser) {
if (!ShouldTrackBrowser(browser))
return;
TabStripModel* tab_strip_model = browser->tab_strip_model();
tab_strip_model->AddObserver(tab_strip_model_observer_);
TabStripModelChange::Insert insert;
for (int i = 0; i < tab_strip_model->count(); ++i) {
insert.contents.push_back({tab_strip_model->GetWebContentsAt(i), i});
}
TabStripModelChange change(std::move(insert));
TabStripSelectionChange selection(tab_strip_model->GetActiveWebContents(),
tab_strip_model->selection_model());
tab_strip_model_observer_->OnTabStripModelChanged(tab_strip_model, change,
selection);
}
void BrowserTabStripTracker::OnBrowserAdded(Browser* browser) {
// No Browser should be added when iterating on Browsers in Init(), as that
// may invalidate the iterator.
DCHECK(!is_processing_initial_browsers_);
MaybeTrackBrowser(browser);
}
void BrowserTabStripTracker::OnBrowserRemoved(Browser* browser) {
// No Browser should be removed when iterating on Browsers in Init(), as that
// invalidates any iterator that is past the removed Browser.
DCHECK(!is_processing_initial_browsers_);
// Per ObserverList::RemoveObserver() documentation, this does nothing if the
// observer is not in the ObserverList (i.e. if |browser| is not tracked).
browser->tab_strip_model()->RemoveObserver(tab_strip_model_observer_);
}
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