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// Copyright 2018 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 "content/browser/renderer_host/input/fling_scheduler.h"
#include "build/build_config.h"
#include "content/browser/renderer_host/render_widget_host_impl.h"
#include "ui/compositor/compositor.h"
#if defined(USE_AURA)
#include "ui/aura/window.h"
#include "ui/aura/window_tree_host.h"
#endif
namespace content {
FlingScheduler::FlingScheduler(RenderWidgetHostImpl* host) : host_(host) {
DCHECK(host);
}
FlingScheduler::~FlingScheduler() {
if (observed_compositor_)
observed_compositor_->RemoveAnimationObserver(this);
}
void FlingScheduler::ScheduleFlingProgress(
base::WeakPtr<FlingController> fling_controller) {
DCHECK(fling_controller);
fling_controller_ = fling_controller;
// Don't do anything if a ui::Compositor is already being observed.
if (observed_compositor_)
return;
ui::Compositor* compositor = GetCompositor();
// If a ui::Compositor can't be obtained, ask the host for BeginFrames.
if (!compositor) {
host_->SetNeedsBeginFrameForFlingProgress();
return;
}
compositor->AddAnimationObserver(this);
observed_compositor_ = compositor;
}
void FlingScheduler::DidStopFlingingOnBrowser(
base::WeakPtr<FlingController> fling_controller) {
DCHECK(fling_controller);
if (observed_compositor_) {
observed_compositor_->RemoveAnimationObserver(this);
observed_compositor_ = nullptr;
}
fling_controller_ = nullptr;
host_->DidStopFlinging();
}
void FlingScheduler::ProgressFlingOnBeginFrameIfneeded(
base::TimeTicks current_time) {
// No fling is active.
if (!fling_controller_)
return;
// FlingProgress will be called within FlingController::OnAnimationStep.
if (observed_compositor_)
return;
fling_controller_->ProgressFling(current_time);
}
ui::Compositor* FlingScheduler::GetCompositor() {
#if defined(USE_AURA)
if (host_->GetView() && host_->GetView()->GetNativeView() &&
host_->GetView()->GetNativeView()->GetHost() &&
host_->GetView()->GetNativeView()->GetHost()->compositor()) {
return host_->GetView()->GetNativeView()->GetHost()->compositor();
}
#endif
return nullptr;
}
void FlingScheduler::OnAnimationStep(base::TimeTicks timestamp) {
if (fling_controller_)
fling_controller_->ProgressFling(timestamp);
}
void FlingScheduler::OnCompositingShuttingDown(ui::Compositor* compositor) {
DCHECK_EQ(observed_compositor_, compositor);
observed_compositor_->RemoveAnimationObserver(this);
observed_compositor_ = nullptr;
}
} // namespace content
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