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// Copyright 2024 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/ash/mahi/media_app/mahi_media_app_client.h"
#include "ash/shell.h"
#include "base/check_deref.h"
#include "base/i18n/break_iterator.h"
#include "base/strings/utf_string_conversions.h"
#include "base/unguessable_token.h"
#include "chromeos/components/mahi/public/cpp/mahi_media_app_content_manager.h"
#include "chromeos/components/mahi/public/cpp/mahi_media_app_events_proxy.h"
#include "chromeos/crosapi/mojom/mahi.mojom.h"
#include "ui/aura/client/focus_client.h"
#include "ui/gfx/geometry/rect_conversions.h"
#include "ui/gfx/image/image_skia.h"
namespace ash {
namespace {
// We truncate PDF files that have thousands of pages and tremendous amount of
// text with this limit, to save timecost of GetPdfContent, and to respect the
// capacity of the server side model.
constexpr int32_t kContentByteSizeLimit = 5 * 1000 * 1000;
constexpr int32_t kContentWordCountThreshold = 50;
using ::base::i18n::BreakIterator;
// Checks the content word count meets the `threshold`.
bool ContentsWordCountSatisfied(std::u16string_view contents,
int32_t threshold) {
int32_t word_count = 0;
BreakIterator break_iter(contents, BreakIterator::BREAK_WORD);
if (!break_iter.Init()) {
return false;
}
while (break_iter.Advance()) {
if (break_iter.IsWord()) {
++word_count;
if (word_count >= threshold) {
return true;
}
}
}
return false;
}
} // namespace
MahiMediaAppClient::MahiMediaAppClient(
mojo::PendingRemote<ash::media_app_ui::mojom::MahiUntrustedPage> page,
const std::string& file_name,
aura::Window* media_app_window)
: client_id_(base::UnguessableToken::Create()),
media_app_pdf_file_(std::move(page)),
file_name_(file_name),
media_app_window_(media_app_window) {
if (!ash::Shell::HasInstance()) {
return;
}
CHECK(media_app_window_);
// Registers self to `MahiMediaAppContentManager` as a client.
chromeos::MahiMediaAppContentManager::Get()->AddClient(client_id_, this);
// Starts to observe media_app_window_ events.
window_observation_.Observe(media_app_window_);
}
MahiMediaAppClient::~MahiMediaAppClient() {
// If `media_app_window_` is null, it means the media app window is closed and
// `OnWindowDestroying` is already called, the following part is done at that
// time.
if (media_app_window_ == nullptr) {
return;
}
// Broadcasts the PDF closed event.
chromeos::MahiMediaAppEventsProxy::Get()->OnPdfClosed(client_id_);
// Manually calls `RemoveClient()` when disconnecting.
chromeos::MahiMediaAppContentManager::Get()->RemoveClient(client_id_);
}
void MahiMediaAppClient::OnPdfLoaded() {
if (!ash::Shell::HasInstance()) {
return;
}
// On PDF loaded, the client starts to observe focus events and notify Mahi
// system when the media app window has focus.
focus_observation_.Reset();
aura::client::FocusClient* focus_client =
aura::client::GetFocusClient(ash::Shell::GetPrimaryRootWindow());
focus_observation_.Observe(focus_client);
// Checks the current focused window.
OnWindowFocused(focus_client->GetFocusedWindow(), nullptr);
}
void MahiMediaAppClient::OnPdfFileNameUpdated(const std::string& new_name) {
if (file_name_ == new_name) {
return;
}
file_name_ = new_name;
CHECK(focus_observation_.IsObserving());
// Notifies this change if the media app window has focus.
OnWindowFocused(focus_observation_.GetSource()->GetFocusedWindow(), nullptr);
}
void MahiMediaAppClient::OnPdfContextMenuShow(
const ::gfx::RectF& anchor,
const std::string& selected_text) {
// The order matters here because some event observers need to inquire the
// latest selected text.
chromeos::MahiMediaAppContentManager::Get()->SetSelectedText(selected_text);
chromeos::MahiMediaAppEventsProxy::Get()->OnPdfContextMenuShown(
client_id_, ::gfx::ToEnclosingRect(anchor));
}
void MahiMediaAppClient::OnPdfContextMenuHide() {
chromeos::MahiMediaAppEventsProxy::Get()->OnPdfContextMenuHide();
}
void MahiMediaAppClient::GetPdfContent(GetContentCallback callback) {
media_app_pdf_file_->GetPdfContent(
kContentByteSizeLimit,
base::BindOnce(
[](GetContentCallback callback, base::UnguessableToken client_id,
const std::optional<std::string>& content) {
if (!content.has_value()) {
// TODO(b/335741382): UMA metric for this case.
std::move(callback).Run(nullptr);
return;
}
const std::u16string u16content =
base::UTF8ToUTF16(content.value());
if (!ContentsWordCountSatisfied(u16content,
kContentWordCountThreshold)) {
// TODO(b/335741382): UMA metric for this case.
std::move(callback).Run(nullptr);
return;
}
std::move(callback).Run(crosapi::mojom::MahiPageContent::New(
client_id,
/*page_id=*/client_id, std::move(u16content)));
},
std::move(callback), client_id_));
}
void MahiMediaAppClient::HideMediaAppContextMenu() {
media_app_pdf_file_->HidePdfContextMenu();
}
void MahiMediaAppClient::OnWindowFocused(aura::Window* gained_focus,
aura::Window* lost_focus) {
if (gained_focus == nullptr || gained_focus == lost_focus) {
return;
}
if (gained_focus == media_app_window_ ||
gained_focus->GetToplevelWindow() == media_app_window_) {
// Observed media app window get focus.
chromeos::MahiMediaAppEventsProxy::Get()->OnPdfGetFocus(client_id_);
}
}
void MahiMediaAppClient::OnWindowBoundsChanged(
aura::Window* window,
const gfx::Rect& old_bounds,
const gfx::Rect& new_bounds,
ui::PropertyChangeReason reason) {
if (window == media_app_window_) {
// Any changes to the window bounds (from moving the window or resizing)
// might affect the context menu position. Instead of updating the Mahi card
// to follow the context menu, make the Media app hide the context menu.
media_app_pdf_file_->HidePdfContextMenu();
}
}
void MahiMediaAppClient::OnWindowDestroying(aura::Window* window) {
if (window == media_app_window_) {
// Broadcasts the PDF closed event.
chromeos::MahiMediaAppEventsProxy::Get()->OnPdfClosed(client_id_);
// Manually calls `RemoveClient()` when window destories.
chromeos::MahiMediaAppContentManager::Get()->RemoveClient(client_id_);
media_app_window_ = nullptr;
window_observation_.Reset();
}
}
} // namespace ash
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