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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_util.h"
#include <algorithm>
#include "base/check_op.h"
#include "chrome/browser/resource_coordinator/tab_lifecycle_unit_external.h"
#include "chrome/browser/resource_coordinator/tab_lifecycle_unit_source.h"
#include "chrome/browser/ui/tabs/tab_strip_model.h"
#include "components/tabs/public/split_tab_data.h"
#include "components/tabs/public/split_tab_id.h"
namespace split_tabs {
int GetIndexOfLastActiveTab(TabStripModel* tab_strip_model,
split_tabs::SplitTabId split_id) {
const std::vector<tabs::TabInterface*> split_tabs =
tab_strip_model->GetSplitData(split_id)->ListTabs();
// Check if a tab is activated first before comparing the WebContent's last
// focused time because the activation happens before focus time updates and
// wouldn't be accurate for tabs that just had its activation state changed.
for (tabs::TabInterface* tab : split_tabs) {
if (tab->IsActivated()) {
return tab_strip_model->GetIndexOfTab(tab);
}
}
tabs::TabInterface* const recently_active = *std::max_element(
split_tabs.begin(), split_tabs.end(),
[](tabs::TabInterface* a, tabs::TabInterface* b) {
auto get_last_focused_time_for_tab = [](const tabs::TabInterface* tab) {
return resource_coordinator::TabLifecycleUnitSource::
GetTabLifecycleUnitExternal(tab->GetContents())
->GetLastFocusedTime();
};
return get_last_focused_time_for_tab(b) >
get_last_focused_time_for_tab(a);
});
return tab_strip_model->GetIndexOfTab(recently_active);
}
SplitTabActiveLocation GetLastActiveTabLocation(
TabStripModel* tab_strip_model,
split_tabs::SplitTabId split_id) {
split_tabs::SplitTabData* const split_tab_data =
tab_strip_model->GetSplitData(split_id);
std::vector<tabs::TabInterface*> tabs_in_split = split_tab_data->ListTabs();
CHECK_EQ(tabs_in_split.size(), 2U);
const int last_active_index =
GetIndexOfLastActiveTab(tab_strip_model, split_id);
CHECK_NE(last_active_index, TabStripModel::kNoTab);
const int first_tab_index = tab_strip_model->GetIndexOfTab(tabs_in_split[0]);
const bool first_tab_activated = last_active_index == first_tab_index;
if (split_tab_data->visual_data()->split_layout() ==
SplitTabLayout::kVertical) {
return first_tab_activated ? SplitTabActiveLocation::kStart
: SplitTabActiveLocation::kEnd;
} else {
return first_tab_activated ? SplitTabActiveLocation::kTop
: SplitTabActiveLocation::kBottom;
}
}
} // namespace split_tabs
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