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// Copyright 2020 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/aura/scoped_window_capture_request.h"
#include "ui/aura/window.h"
namespace aura {
ScopedWindowCaptureRequest::ScopedWindowCaptureRequest(
ScopedWindowCaptureRequest&& other)
// Do not decrement requests on |other| nor increment them on |this| since
// we are moving the same request into here.
: window_(other.DetachFromCurrentWindow(/*decrement_requests=*/false)) {
if (window_)
AttachToCurrentWindow(/*increment_requests=*/false);
}
ScopedWindowCaptureRequest& ScopedWindowCaptureRequest::operator=(
ScopedWindowCaptureRequest&& rhs) {
// Note that |this| might have been attached to a different window than that
// of |rhs|, so we need to detach from while decrementing the requests.
DetachFromCurrentWindow(/*decrement_requests=*/true);
// However, |rhs| is moving into |this|, so it's essentially the same request,
// therefore, no need to either increment or decrement the requests.
window_ = rhs.DetachFromCurrentWindow(/*decrement_requests=*/false);
if (window_)
AttachToCurrentWindow(/*increment_requests=*/false);
return *this;
}
ScopedWindowCaptureRequest::~ScopedWindowCaptureRequest() {
DetachFromCurrentWindow(/*decrement_requests=*/true);
}
viz::SubtreeCaptureId ScopedWindowCaptureRequest::GetCaptureId() const {
return window_ ? window_->subtree_capture_id() : viz::SubtreeCaptureId();
}
void ScopedWindowCaptureRequest::OnWindowDestroying(Window* window) {
// No need to call OnScopedWindowCaptureRequestRemoved() since the window is
// being destroyed.
DetachFromCurrentWindow(/*decrement_requests=*/false);
}
ScopedWindowCaptureRequest::ScopedWindowCaptureRequest(Window* window)
: window_(window) {
AttachToCurrentWindow(/*increment_requests=*/true);
}
void ScopedWindowCaptureRequest::AttachToCurrentWindow(
bool increment_requests) {
DCHECK(window_);
DCHECK(!window_->IsRootWindow());
if (increment_requests)
window_->OnScopedWindowCaptureRequestAdded();
window_->AddObserver(this);
}
Window* ScopedWindowCaptureRequest::DetachFromCurrentWindow(
bool decrement_requests) {
Window* result = window_;
if (window_) {
window_->RemoveObserver(this);
if (decrement_requests)
window_->OnScopedWindowCaptureRequestRemoved();
window_ = nullptr;
}
return result;
}
} // namespace aura
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