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// Copyright 2012 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "ui/wm/core/capture_controller.h"
#include "base/memory/raw_ptr.h"
#include "base/observer_list.h"
#include "ui/aura/client/capture_client_observer.h"
#include "ui/aura/env.h"
#include "ui/aura/window.h"
#include "ui/aura/window_event_dispatcher.h"
#include "ui/aura/window_tracker.h"
#include "ui/aura/window_tree_host.h"
namespace wm {
// static
CaptureController* CaptureController::instance_ = nullptr;
////////////////////////////////////////////////////////////////////////////////
// CaptureController, public:
CaptureController::CaptureController()
: capture_window_(nullptr), capture_delegate_(nullptr) {
DCHECK(!instance_);
instance_ = this;
}
CaptureController::~CaptureController() {
DCHECK_EQ(instance_, this);
instance_ = nullptr;
}
void CaptureController::Attach(aura::Window* root) {
DCHECK_EQ(0u, delegates_.count(root));
delegates_[root] = root->GetHost()->dispatcher();
aura::client::SetCaptureClient(root, this);
}
void CaptureController::Detach(aura::Window* root) {
delegates_.erase(root);
aura::client::SetCaptureClient(root, nullptr);
}
void CaptureController::PrepareForShutdown() {
DCHECK(!destroying_);
SetCapture(nullptr);
destroying_ = true;
}
////////////////////////////////////////////////////////////////////////////////
// CaptureController, aura::client::CaptureClient implementation:
void CaptureController::SetCapture(aura::Window* new_capture_window) {
if (destroying_) {
return;
}
if (capture_window_ == new_capture_window)
return;
// Make sure window has a root window.
DCHECK(!new_capture_window || new_capture_window->GetRootWindow());
DCHECK(!capture_window_ || capture_window_->GetRootWindow());
aura::Window* old_capture_window = capture_window_;
aura::client::CaptureDelegate* old_capture_delegate = capture_delegate_;
// Copy the map in case it's modified out from under us.
std::map<aura::Window*,
raw_ptr<aura::client::CaptureDelegate, CtnExperimental>>
delegates = delegates_;
aura::WindowTracker tracker;
if (new_capture_window)
tracker.Add(new_capture_window);
if (old_capture_window)
tracker.Add(old_capture_window);
// If we're starting a new capture, cancel all touches that aren't
// targeted to the capturing window.
if (new_capture_window) {
aura::Env::GetInstance()->gesture_recognizer()->CancelActiveTouchesExcept(
new_capture_window);
// Cancelling touches might cause |new_capture_window| to get deleted.
// Track |new_capture_window| and check if it still exists before
// committing |capture_window_|.
if (!tracker.Contains(new_capture_window))
new_capture_window = nullptr;
if (old_capture_window && !tracker.Contains(old_capture_window))
old_capture_window = nullptr;
}
capture_window_ = new_capture_window;
aura::Window* capture_root_window =
capture_window_ ? capture_window_->GetRootWindow() : nullptr;
capture_delegate_ = delegates_.find(capture_root_window) == delegates_.end()
? nullptr
: delegates_[capture_root_window].get();
// With more than one delegate (e.g. multiple displays), an earlier
// UpdateCapture() call could cancel an existing capture and destroy
// |old_capture_window|, causing a later UpdateCapture() call to access
// a dangling pointer, so detect and handle it.
for (const auto& it : delegates) {
it.second->UpdateCapture(old_capture_window, new_capture_window);
if (old_capture_window && !tracker.Contains(old_capture_window))
old_capture_window = nullptr;
}
if (capture_delegate_ != old_capture_delegate) {
if (old_capture_delegate)
old_capture_delegate->ReleaseNativeCapture();
if (capture_delegate_)
capture_delegate_->SetNativeCapture();
}
observers_.Notify(&aura::client::CaptureClientObserver::OnCaptureChanged,
old_capture_window, capture_window_);
}
void CaptureController::ReleaseCapture(aura::Window* window) {
if (capture_window_ != window)
return;
SetCapture(nullptr);
}
aura::Window* CaptureController::GetCaptureWindow() {
return capture_window_;
}
aura::Window* CaptureController::GetGlobalCaptureWindow() {
return capture_window_;
}
void CaptureController::AddObserver(
aura::client::CaptureClientObserver* observer) {
observers_.AddObserver(observer);
}
void CaptureController::RemoveObserver(
aura::client::CaptureClientObserver* observer) {
observers_.RemoveObserver(observer);
}
////////////////////////////////////////////////////////////////////////////////
// ScopedCaptureClient:
ScopedCaptureClient::ScopedCaptureClient(aura::Window* root)
: root_window_(root) {
root->AddObserver(this);
CaptureController::Get()->Attach(root);
}
ScopedCaptureClient::~ScopedCaptureClient() {
Shutdown();
}
void ScopedCaptureClient::OnWindowDestroyed(aura::Window* window) {
DCHECK_EQ(window, root_window_);
Shutdown();
}
void ScopedCaptureClient::Shutdown() {
if (!root_window_)
return;
root_window_->RemoveObserver(this);
CaptureController::Get()->Detach(root_window_);
root_window_ = nullptr;
}
///////////////////////////////////////////////////////////////////////////////
// CaptureController::TestApi
void ScopedCaptureClient::TestApi::SetDelegate(
aura::client::CaptureDelegate* delegate) {
CaptureController::Get()->delegates_[client_->root_window_] = delegate;
}
} // namespace wm
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