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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.
#include "chrome/browser/ui/tabs/split_tab_scrim_controller.h"
#include <memory>
#include "base/callback_list.h"
#include "base/check.h"
#include "base/functional/bind.h"
#include "chrome/browser/ui/browser_window/public/browser_window_interface.h"
#include "chrome/browser/ui/tabs/split_tab_scrim_delegate.h"
#include "components/omnibox/common/omnibox_focus_state.h"
#include "components/tabs/public/tab_interface.h"
namespace split_tabs {
SplitTabScrimController::SplitTabScrimController(
std::unique_ptr<SplitTabScrimDelegate> split_tab_scrim_delegate,
BrowserWindowInterface* browser_window_interface)
: split_tab_scrim_delegate_(std::move(split_tab_scrim_delegate)),
browser_window_interface_(browser_window_interface) {
active_tab_change_subscription_ =
browser_window_interface_->RegisterActiveTabDidChange(base::BindRepeating(
&SplitTabScrimController::OnActiveTabChange, base::Unretained(this)));
}
SplitTabScrimController::~SplitTabScrimController() = default;
void SplitTabScrimController::OnOmniboxFocusChanged(
OmniboxFocusState state,
OmniboxFocusChangeReason reason) {
UpdateScrimVisibility();
}
void SplitTabScrimController::OnActiveTabChange(
BrowserWindowInterface* browser_window_interface) {
omnibox_tab_helper_observation_.Reset();
tabs::TabInterface* const active_tab =
browser_window_interface->GetActiveTabInterface();
if (active_tab) {
tab_will_detach_subscription_ =
active_tab->RegisterWillDetach(base::BindRepeating(
&SplitTabScrimController::OnTabWillDetach, base::Unretained(this)));
OmniboxTabHelper* const tab_helper =
OmniboxTabHelper::FromWebContents(active_tab->GetContents());
CHECK(tab_helper);
omnibox_tab_helper_observation_.Observe(tab_helper);
}
// Need to update the scrim visibility because the omnibox focus state
// event might have already been triggered before the active tab change.
UpdateScrimVisibility();
}
void SplitTabScrimController::OnTabWillDetach(
tabs::TabInterface* tab_interface,
tabs::TabInterface::DetachReason reason) {
// Reset the omnibox tab helper observation to ensure that it doesn't live
// longer than the web contents it is observing.
omnibox_tab_helper_observation_.Reset();
tab_will_detach_subscription_ = base::CallbackListSubscription();
}
void SplitTabScrimController::UpdateScrimVisibility() {
tabs::TabInterface* const active_tab =
browser_window_interface_->GetActiveTabInterface();
if (active_tab &&
(OmniboxTabHelper::FromWebContents(active_tab->GetContents())
->focus_state() != OmniboxFocusState::OMNIBOX_FOCUS_NONE)) {
split_tab_scrim_delegate_->ShowScrim();
} else {
split_tab_scrim_delegate_->HideScrim();
}
}
} // namespace split_tabs
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