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// Copyright 2025 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef CHROME_BROWSER_UI_TABS_TAB_LIST_BRIDGE_H_
#define CHROME_BROWSER_UI_TABS_TAB_LIST_BRIDGE_H_
#include "base/memory/raw_ref.h"
#include "base/observer_list.h"
#include "chrome/browser/ui/tabs/tab_list_interface.h"
#include "chrome/browser/ui/tabs/tab_list_interface_observer.h"
#include "chrome/browser/ui/tabs/tab_strip_model.h"
#include "chrome/browser/ui/tabs/tab_strip_model_observer.h"
#include "ui/base/unowned_user_data/scoped_unowned_user_data.h"
// This class is a bridge between the TabListInterface, a cross-platform
// abstract class representing a collection of tabs, and the implementations
// that exist on classic desktop platforms -- specifically, TabStripModel.
// TabListInterface is designed to be used on code that is shared between
// classic desktop platforms and the experimental desktop android platform;
// this allows us to use a single interface for code that runs on both.
//
// When possible, the behavior of this class should closely match the behavior
// Android's implementation (in TabModel), and, ideally, the existing analogous
// methods in TabStripModel. This makes migration easier and allows for similar
// behaviors between platforms.
//
// One exception to the above is that this class assumes (and CHECK()s) that
// tab operations are valid. This is different from Android's implementation,
// which is more forgiving. The stricter approach is used because it matches
// the classic desktop implementation and also because it leads to more
// deterministic behavior. Callers should validate the presence of a tab before
// trying to perform operations on it, and callers can gracefully handle the
// case of a tab being missing (if it's expected).
class TabListBridge : public TabListInterface, public TabStripModelObserver {
public:
DECLARE_USER_DATA(TabListBridge);
TabListBridge(TabStripModel& tab_strip_model,
ui::UnownedUserDataHost& unowned_data_host);
TabListBridge(const TabListBridge&) = delete;
TabListBridge& operator=(const TabListBridge&) = delete;
~TabListBridge() override;
// TabListInterface:
void AddTabListInterfaceObserver(TabListInterfaceObserver* observer) override;
void RemoveTabListInterfaceObserver(
TabListInterfaceObserver* observer) override;
int GetTabCount() const override;
int GetActiveIndex() const override;
tabs::TabInterface* GetActiveTab() override;
void OpenTab(const GURL& url, int index) override;
void DiscardTab(tabs::TabHandle tab) override;
void DuplicateTab(tabs::TabHandle tab) override;
tabs::TabInterface* GetTab(int index) override;
int GetIndexOfTab(tabs::TabHandle tab) override;
void HighlightTabs(tabs::TabHandle tab_to_activate,
const std::set<tabs::TabHandle>& tabs) override;
void MoveTab(tabs::TabHandle tab, int index) override;
void CloseTab(tabs::TabHandle tab) override;
std::vector<tabs::TabInterface*> GetAllTabs() override;
void PinTab(tabs::TabHandle tab) override;
void UnpinTab(tabs::TabHandle tab) override;
std::optional<tab_groups::TabGroupId> AddTabsToGroup(
std::optional<tab_groups::TabGroupId> group_id,
const std::set<tabs::TabHandle>& tabs) override;
void Ungroup(const std::set<tabs::TabHandle>& tabs) override;
void MoveGroupTo(tab_groups::TabGroupId group_id, int index) override;
private:
// TabStripModelObserver:
void OnTabStripModelChanged(
TabStripModel* tab_strip_model,
const TabStripModelChange& change,
const TabStripSelectionChange& selection) override;
// The underlying TabStripModel that this serves as a bridge for.
// Must outlive this object.
raw_ref<TabStripModel> tab_strip_;
base::ObserverList<TabListInterfaceObserver> observers_;
ui::ScopedUnownedUserData<TabListBridge> scoped_data_holder_;
};
#endif // CHROME_BROWSER_UI_TABS_TAB_LIST_BRIDGE_H_
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