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// Copyright 2017 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "components/exo/seat.h"
#include "ash/shell.h"
#include "base/auto_reset.h"
#include "base/strings/utf_string_conversions.h"
#include "components/exo/data_source.h"
#include "components/exo/keyboard.h"
#include "components/exo/shell_surface.h"
#include "components/exo/surface.h"
#include "components/exo/wm_helper.h"
#include "ui/aura/client/focus_client.h"
#include "ui/base/clipboard/clipboard_monitor.h"
#include "ui/base/clipboard/scoped_clipboard_writer.h"
namespace exo {
namespace {
Surface* GetEffectiveFocus(aura::Window* window) {
if (!window)
return nullptr;
Surface* const surface = Surface::AsSurface(window);
if (surface)
return surface;
// Fallback to main surface.
aura::Window* const top_level_window = window->GetToplevelWindow();
if (!top_level_window)
return nullptr;
return ShellSurface::GetMainSurface(top_level_window);
}
} // namespace
Seat::Seat() : changing_clipboard_data_to_selection_source_(false) {
aura::client::GetFocusClient(ash::Shell::Get()->GetPrimaryRootWindow())
->AddObserver(this);
// Prepend handler as it's critical that we see all events.
WMHelper::GetInstance()->PrependPreTargetHandler(this);
ui::ClipboardMonitor::GetInstance()->AddObserver(this);
}
Seat::~Seat() {
DCHECK(!selection_source_) << "DataSource must be released before Seat";
aura::client::GetFocusClient(ash::Shell::Get()->GetPrimaryRootWindow())
->RemoveObserver(this);
WMHelper::GetInstance()->RemovePreTargetHandler(this);
ui::ClipboardMonitor::GetInstance()->RemoveObserver(this);
}
void Seat::AddObserver(SeatObserver* observer) {
observers_.AddObserver(observer);
}
void Seat::RemoveObserver(SeatObserver* observer) {
observers_.RemoveObserver(observer);
}
Surface* Seat::GetFocusedSurface() {
return GetEffectiveFocus(WMHelper::GetInstance()->GetFocusedWindow());
}
void Seat::SetSelection(DataSource* source) {
if (!source) {
ui::Clipboard::GetForCurrentThread()->Clear(ui::CLIPBOARD_TYPE_COPY_PASTE);
// selection_source_ is Cancelled() and reset() in OnClipboardDataChanged().
return;
}
if (selection_source_) {
if (selection_source_->get() == source)
return;
selection_source_->get()->Cancelled();
}
selection_source_ = std::make_unique<ScopedDataSource>(source, this);
// Unretained is safe as Seat always outlives DataSource.
source->ReadData(base::Bind(&Seat::OnDataRead, base::Unretained(this)));
}
void Seat::OnDataRead(const std::vector<uint8_t>& data) {
base::AutoReset<bool> auto_reset(
&changing_clipboard_data_to_selection_source_, true);
ui::ScopedClipboardWriter writer(ui::CLIPBOARD_TYPE_COPY_PASTE);
writer.WriteText(base::UTF8ToUTF16(base::StringPiece(
reinterpret_cast<const char*>(data.data()), data.size())));
}
////////////////////////////////////////////////////////////////////////////////
// aura::client::FocusChangeObserver overrides:
void Seat::OnWindowFocused(aura::Window* gained_focus,
aura::Window* lost_focus) {
Surface* const surface = GetEffectiveFocus(gained_focus);
for (auto& observer : observers_) {
observer.OnSurfaceFocusing(surface);
}
for (auto& observer : observers_) {
observer.OnSurfaceFocused(surface);
}
}
////////////////////////////////////////////////////////////////////////////////
// ui::EventHandler overrides:
void Seat::OnKeyEvent(ui::KeyEvent* event) {
switch (event->type()) {
case ui::ET_KEY_PRESSED:
pressed_keys_.insert(event->code());
break;
case ui::ET_KEY_RELEASED:
pressed_keys_.erase(event->code());
break;
default:
NOTREACHED();
break;
}
modifier_flags_ = event->flags();
}
////////////////////////////////////////////////////////////////////////////////
// ui::ClipboardObserver overrides:
void Seat::OnClipboardDataChanged() {
if (!selection_source_ || changing_clipboard_data_to_selection_source_)
return;
selection_source_->get()->Cancelled();
selection_source_.reset();
}
////////////////////////////////////////////////////////////////////////////////
// DataSourceObserver overrides:
void Seat::OnDataSourceDestroying(DataSource* source) {
if (selection_source_ && selection_source_->get() == source)
selection_source_.reset();
}
} // namespace exo
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