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// Copyright (c) 2012 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 "ui/wm/core/capture_controller.h"
#include "ui/aura/window.h"
#include "ui/aura/window_event_dispatcher.h"
#include "ui/aura/window_tree_host.h"
namespace wm {
////////////////////////////////////////////////////////////////////////////////
// CaptureController, public:
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);
}
////////////////////////////////////////////////////////////////////////////////
// CaptureController, aura::client::CaptureClient implementation:
void CaptureController::SetCapture(aura::Window* new_capture_window) {
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*, aura::client::CaptureDelegate*> delegates =
delegates_;
// If we're actually starting capture, then cancel any touches/gestures
// that aren't already locked to the new window, and transfer any on the
// old capture window to the new one. When capture is released we have no
// distinction between the touches/gestures that were in the window all
// along (and so shouldn't be canceled) and those that got moved, so
// just leave them all where they are.
if (new_capture_window) {
ui::GestureRecognizer::Get()->TransferEventsTo(old_capture_window,
new_capture_window);
}
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];
for (const auto& it : delegates)
it.second->UpdateCapture(old_capture_window, new_capture_window);
if (capture_delegate_ != old_capture_delegate) {
if (old_capture_delegate)
old_capture_delegate->ReleaseNativeCapture();
if (capture_delegate_)
capture_delegate_->SetNativeCapture();
}
}
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_;
}
////////////////////////////////////////////////////////////////////////////////
// CaptureController, private:
CaptureController::CaptureController()
: capture_window_(nullptr),
capture_delegate_(nullptr) {
}
CaptureController::~CaptureController() {
}
////////////////////////////////////////////////////////////////////////////////
// ScopedCaptureClient:
// static
CaptureController* ScopedCaptureClient::capture_controller_ = nullptr;
ScopedCaptureClient::ScopedCaptureClient(aura::Window* root)
: root_window_(root) {
root->AddObserver(this);
if (!capture_controller_)
capture_controller_ = new CaptureController;
capture_controller_->Attach(root);
}
ScopedCaptureClient::~ScopedCaptureClient() {
Shutdown();
}
// static
bool ScopedCaptureClient::IsActive() {
return capture_controller_ && capture_controller_->is_active();
}
void ScopedCaptureClient::OnWindowDestroyed(aura::Window* window) {
DCHECK_EQ(window, root_window_);
Shutdown();
}
void ScopedCaptureClient::Shutdown() {
if (!root_window_)
return;
root_window_->RemoveObserver(this);
capture_controller_->Detach(root_window_);
if (!capture_controller_->is_active()) {
delete capture_controller_;
capture_controller_ = nullptr;
}
root_window_ = nullptr;
}
///////////////////////////////////////////////////////////////////////////////
// CaptureController::TestApi
void ScopedCaptureClient::TestApi::SetDelegate(
aura::client::CaptureDelegate* delegate) {
client_->capture_controller_->delegates_[client_->root_window_] = delegate;
}
} // namespace wm
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