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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_WIN_INSTALLER_DOWNLOADER_INSTALLER_DOWNLOADER_ACTIVE_BROWSER_WINDOW_TRACKER_H_
#define CHROME_BROWSER_WIN_INSTALLER_DOWNLOADER_INSTALLER_DOWNLOADER_ACTIVE_BROWSER_WINDOW_TRACKER_H_
#include "base/callback_list.h"
#include "base/functional/callback_forward.h"
#include "base/memory/raw_ptr.h"
#include "chrome/browser/ui/browser_list_observer.h"
class BrowserWindowInterface;
namespace installer_downloader {
// Lightweight helper that always knows which *normal* browser window was last
// activated. Observers can register for change notifications.
// - The tracker **does not** own the window.
// - When the last window closes, `active_window()` returns `nullptr`.
class InstallerDownloaderActiveBrowserWindowTracker final
: public BrowserListObserver {
public:
using WindowChangedCallback =
base::RepeatingCallback<void(BrowserWindowInterface*)>;
InstallerDownloaderActiveBrowserWindowTracker();
InstallerDownloaderActiveBrowserWindowTracker(
const InstallerDownloaderActiveBrowserWindowTracker&) = delete;
InstallerDownloaderActiveBrowserWindowTracker& operator=(
const InstallerDownloaderActiveBrowserWindowTracker&) = delete;
~InstallerDownloaderActiveBrowserWindowTracker() override;
// Register for active window changes. The callback is invoked immediately
// with the current active window, then on every subsequent change.
base::CallbackListSubscription RegisterActiveWindowChangedCallback(
WindowChangedCallback callback);
// Register for window remove changes. The callback is invoked immediately
// when a browser window is removed.
base::CallbackListSubscription RegisterRemovedWindowCallback(
WindowChangedCallback callback);
private:
// BrowserListObserver:
void OnBrowserSetLastActive(Browser* browser) override;
void OnBrowserRemoved(Browser* browser) override;
// Helps to update `last_active_window_` when the active browser changes or
// when a browser removed.
void MaybeUpdateLastActiveWindow(Browser* browser);
// Track the last active window. It can be null if all the browser window type
// are not normal.
raw_ptr<BrowserWindowInterface> last_active_window_;
// Stores the list of callback listening for active browser window change.
base::RepeatingCallbackList<void(BrowserWindowInterface*)>
active_window_change_callbacks_;
// Stores the list of callback listening for browser window remove event.
base::RepeatingCallbackList<void(BrowserWindowInterface*)>
window_remove_callbacks_;
};
} // namespace installer_downloader
#endif // CHROME_BROWSER_WIN_INSTALLER_DOWNLOADER_INSTALLER_DOWNLOADER_ACTIVE_BROWSER_WINDOW_TRACKER_H_
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