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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/android/tab_model/tab_collection_tab_model_impl.h"
#include <algorithm>
#include <optional>
#include <utility>
#include "base/android/jni_android.h"
#include "base/android/token_android.h"
#include "base/numerics/safe_conversions.h"
#include "chrome/browser/android/tab_android.h"
#include "chrome/browser/android/tab_interface_android.h"
#include "chrome/browser/profiles/profile.h"
#include "components/tabs/public/tab_group.h"
#include "components/tabs/public/tab_group_tab_collection.h"
#include "components/tabs/public/tab_interface.h"
#include "components/tabs/public/tab_strip_collection.h"
#include "tab_collection_tab_model_impl.h"
#include "ui/gfx/range/range.h"
// Must come after all headers that specialize FromJniType() / ToJniType().
// This JNI header is generated from TabCollectionTabModelImpl.java.
#include "chrome/android/chrome_jni_headers/TabCollectionTabModelImpl_jni.h"
using base::android::JavaParamRef;
using base::android::ScopedJavaLocalRef;
using base::android::TokenAndroid;
using tab_groups::TabGroupId;
namespace tabs {
namespace {
constexpr int kInvalidTabIndex = -1;
// Converts the `tab_android` to a `unique_ptr<TabInterface>`. Under the hood we
// use a wrapper class `TabInterfaceAndroid` which takes a weak ptr to
// `TabAndroid` to avoid memory management issues.
std::unique_ptr<TabInterface> ToTabInterface(TabAndroid* tab_android) {
return std::make_unique<TabInterfaceAndroid>(tab_android);
}
// Converts the wrapper class TabInterfaceAndroid* to a TabAndroid*. This will
// crash if the `tab_interface` has outlived the TabAndroid*.
TabAndroid* ToTabAndroid(TabInterface* tab_interface) {
auto weak_tab_android =
static_cast<TabInterfaceAndroid*>(tab_interface)->GetWeakPtr();
CHECK(weak_tab_android);
return static_cast<TabAndroid*>(weak_tab_android.get());
}
} // namespace
TabCollectionTabModelImpl::TabCollectionTabModelImpl(
JNIEnv* env,
const jni_zero::JavaRef<jobject>& java_object,
Profile* profile)
: java_object_(env, java_object),
profile_(profile),
tab_strip_collection_(std::make_unique<TabStripCollection>()) {}
TabCollectionTabModelImpl::~TabCollectionTabModelImpl() = default;
void TabCollectionTabModelImpl::Destroy(JNIEnv* env) {
delete this;
}
int TabCollectionTabModelImpl::GetTabCountRecursive(JNIEnv* env) const {
return base::checked_cast<int>(tab_strip_collection_->TabCountRecursive());
}
int TabCollectionTabModelImpl::GetIndexOfTabRecursive(
JNIEnv* env,
const JavaParamRef<jobject>& j_tab_android) const {
TabAndroid* target_tab = TabAndroid::GetNativeTab(env, j_tab_android);
if (!target_tab) {
return kInvalidTabIndex;
}
int current_index = 0;
for (TabInterface* tab_in_collection : *tab_strip_collection_) {
if (ToTabAndroid(tab_in_collection) == target_tab) {
return current_index;
}
current_index++;
}
return kInvalidTabIndex;
}
ScopedJavaLocalRef<jobject> TabCollectionTabModelImpl::GetTabAtIndexRecursive(
JNIEnv* env,
size_t index) const {
if (index >= tab_strip_collection_->TabCountRecursive()) {
return ScopedJavaLocalRef<jobject>();
}
TabInterface* tab = tab_strip_collection_->GetTabAtIndexRecursive(index);
TabAndroid* tab_android = ToTabAndroid(tab);
return tab_android->GetJavaObject();
}
void TabCollectionTabModelImpl::AddTabRecursive(
JNIEnv* env,
const JavaParamRef<jobject>& j_tab_android,
size_t index,
const JavaParamRef<jobject>& j_tab_group_id,
bool is_pinned) {
TabAndroid* tab_android = TabAndroid::GetNativeTab(env, j_tab_android);
CHECK(tab_android);
std::optional<TabGroupId> tab_group_id;
if (j_tab_group_id) {
tab_group_id = TabGroupId::FromRawToken(
TokenAndroid::FromJavaToken(env, j_tab_group_id));
}
index = GetSafeIndex(index, tab_group_id, is_pinned);
auto tab_interface_android = ToTabInterface(tab_android);
tab_strip_collection_->AddTabRecursive(std::move(tab_interface_android),
index, tab_group_id, is_pinned);
}
size_t TabCollectionTabModelImpl::GetSafeIndex(
size_t proposed_index,
const std::optional<TabGroupId>& tab_group_id,
bool is_pinned) const {
size_t first_non_pinned_index =
tab_strip_collection_->IndexOfFirstNonPinnedTab();
if (is_pinned) {
return std::min(proposed_index, first_non_pinned_index);
}
size_t tab_count = tab_strip_collection_->TabCountRecursive();
size_t clamped_index =
std::clamp(proposed_index, first_non_pinned_index, tab_count);
if (tab_group_id) {
TabGroupTabCollection* group_collection =
tab_strip_collection_->GetTabGroupCollection(*tab_group_id);
if (group_collection) {
gfx::Range range = group_collection->GetTabGroup()->ListTabs();
if (!range.is_empty()) {
return std::clamp(proposed_index, range.start(), range.end());
}
}
}
// Always safe since these are the edges.
if (clamped_index == first_non_pinned_index || clamped_index == tab_count) {
return clamped_index;
}
std::optional<TabGroupId> group_at_index = GetGroupIdAt(clamped_index);
if (group_at_index && group_at_index == GetGroupIdAt(clamped_index - 1)) {
// Insertion will happen inside a tab group we need to push it out.
TabGroupTabCollection* group_collection =
tab_strip_collection_->GetTabGroupCollection(*group_at_index);
gfx::Range range = group_collection->GetTabGroup()->ListTabs();
// Push to the nearest boundary.
if (clamped_index - range.start() < range.end() - clamped_index) {
return range.start();
} else {
return range.end();
}
}
return clamped_index;
}
std::optional<TabGroupId> TabCollectionTabModelImpl::GetGroupIdAt(
size_t index) const {
if (index < tab_strip_collection_->TabCountRecursive()) {
return tab_strip_collection_->GetTabAtIndexRecursive(index)->GetGroup();
} else {
return std::nullopt;
}
}
static jlong JNI_TabCollectionTabModelImpl_Init(
JNIEnv* env,
const JavaParamRef<jobject>& j_java_object,
const JavaParamRef<jobject>& j_profile) {
Profile* profile = Profile::FromJavaObject(j_profile);
TabCollectionTabModelImpl* tab_collection_tab_model_impl =
new TabCollectionTabModelImpl(env, j_java_object, profile);
return reinterpret_cast<intptr_t>(tab_collection_tab_model_impl);
}
} // namespace tabs
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