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// Copyright 2014 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/cocoa/handoff_observer.h"
#include "base/check.h"
#include "chrome/browser/ui/browser.h"
#include "chrome/browser/ui/browser_finder.h"
#include "chrome/browser/ui/browser_list.h"
#include "chrome/browser/ui/tabs/tab_strip_model.h"
#include "content/public/browser/navigation_handle.h"
#include "content/public/browser/web_contents.h"
HandoffObserver::HandoffObserver(NSObject<HandoffObserverDelegate>* delegate)
: delegate_(delegate) {
DCHECK(delegate_);
BrowserList::AddObserver(this);
SetActiveBrowser(chrome::FindLastActive());
}
HandoffObserver::~HandoffObserver() {
BrowserList::RemoveObserver(this);
SetActiveBrowser(nullptr);
}
void HandoffObserver::OnBrowserSetLastActive(Browser* browser) {
SetActiveBrowser(browser);
[delegate_ handoffContentsChanged:GetActiveWebContents()];
}
void HandoffObserver::OnBrowserRemoved(Browser* removed_browser) {
if (active_browser_ != removed_browser) {
return;
}
SetActiveBrowser(chrome::FindLastActive());
[delegate_ handoffContentsChanged:GetActiveWebContents()];
}
void HandoffObserver::OnTabStripModelChanged(
TabStripModel* tab_strip_model,
const TabStripModelChange& change,
const TabStripSelectionChange& selection) {
if (tab_strip_model->empty() || !selection.active_tab_changed()) {
return;
}
StartObservingWebContents(selection.new_contents);
[delegate_ handoffContentsChanged:GetActiveWebContents()];
}
void HandoffObserver::PrimaryPageChanged(content::Page& page) {
[delegate_ handoffContentsChanged:GetActiveWebContents()];
}
void HandoffObserver::TitleWasSet(content::NavigationEntry* entry) {
[delegate_ handoffContentsChanged:GetActiveWebContents()];
}
void HandoffObserver::SetActiveBrowser(Browser* active_browser) {
if (active_browser == active_browser_) {
return;
}
if (active_browser_) {
active_browser_->tab_strip_model()->RemoveObserver(this);
StopObservingWebContents();
}
active_browser_ = active_browser;
if (active_browser_) {
active_browser_->tab_strip_model()->AddObserver(this);
content::WebContents* web_contents = GetActiveWebContents();
if (web_contents) {
StartObservingWebContents(web_contents);
}
}
}
void HandoffObserver::StartObservingWebContents(
content::WebContents* web_contents) {
DCHECK(web_contents);
Observe(web_contents);
}
void HandoffObserver::StopObservingWebContents() {
Observe(nullptr);
}
content::WebContents* HandoffObserver::GetActiveWebContents() {
if (!active_browser_) {
return nullptr;
}
return active_browser_->tab_strip_model()->GetActiveWebContents();
}
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