[Chromecast] Reuse the Aura window manager across receiver apps.

chromecast/graphics/cast_window_manager_aura.cc

+// 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 "chromecast/graphics/cast_window_manager_aura.h"
+
+#include "base/memory/ptr_util.h"
+#include "ui/aura/client/default_capture_client.h"
+#include "ui/aura/env.h"
+#include "ui/aura/layout_manager.h"
+#include "ui/aura/window.h"
+#include "ui/aura/window_tree_host_platform.h"
+#include "ui/base/ime/input_method.h"
+#include "ui/base/ime/input_method_factory.h"
+#include "ui/display/display.h"
+#include "ui/display/screen.h"
+
+namespace chromecast {
+
+// An aura::WindowTreeHost that correctly converts input events.
+class CastWindowTreeHost : public aura::WindowTreeHostPlatform {
+ public:
+  CastWindowTreeHost(bool enable_input, const gfx::Rect& bounds);
+  ~CastWindowTreeHost() override;
+
+  // aura::WindowTreeHostPlatform implementation:
+  void DispatchEvent(ui::Event* event) override;
+
+ private:
+  const bool enable_input_;
+
+  DISALLOW_COPY_AND_ASSIGN(CastWindowTreeHost);
+};
+
+CastWindowTreeHost::CastWindowTreeHost(bool enable_input,
+                                       const gfx::Rect& bounds)
+    : WindowTreeHostPlatform(bounds), enable_input_(enable_input) {}
+
+CastWindowTreeHost::~CastWindowTreeHost() {}
+
+void CastWindowTreeHost::DispatchEvent(ui::Event* event) {
+  if (!enable_input_) {
+    return;
+  }
+
+  if (event->IsKeyEvent()) {
+    // Convert a RawKeyDown into a character insertion; otherwise
+    // the WebContents will ignore most keyboard input.
+    GetInputMethod()->DispatchKeyEvent(event->AsKeyEvent());
+  } else {
+    WindowTreeHostPlatform::DispatchEvent(event);
+  }
+}
+
+// A layout manager owned by the root window.
+class CastLayoutManager : public aura::LayoutManager {
+ public:
+  CastLayoutManager();
+  ~CastLayoutManager() override;
+
+ private:
+  // aura::LayoutManager implementation:
+  void OnWindowResized() override;
+  void OnWindowAddedToLayout(aura::Window* child) override;
+  void OnWillRemoveWindowFromLayout(aura::Window* child) override;
+  void OnWindowRemovedFromLayout(aura::Window* child) override;
+  void OnChildWindowVisibilityChanged(aura::Window* child,
+                                      bool visible) override;
+  void SetChildBounds(aura::Window* child,
+                      const gfx::Rect& requested_bounds) override;
+
+  DISALLOW_COPY_AND_ASSIGN(CastLayoutManager);
+};
+
+CastLayoutManager::CastLayoutManager() {}
+CastLayoutManager::~CastLayoutManager() {}
+
+void CastLayoutManager::OnWindowResized() {
+  // Invoked when the root window of the window tree host has been resized.
+}
+
+void CastLayoutManager::OnWindowAddedToLayout(aura::Window* child) {
+  // Invoked when a window is added to the window tree host.
+}
+
+void CastLayoutManager::OnWillRemoveWindowFromLayout(aura::Window* child) {
+  // Invoked when the root window of the window tree host will be removed.
+}
+
+void CastLayoutManager::OnWindowRemovedFromLayout(aura::Window* child) {
+  // Invoked when the root window of the window tree host has been removed.
+}
+
+void CastLayoutManager::OnChildWindowVisibilityChanged(aura::Window* child,
+                                                       bool visible) {
+  // Note: this is invoked for child windows of the root window.
+}
+
+void CastLayoutManager::SetChildBounds(aura::Window* child,
+                                       const gfx::Rect& requested_bounds) {
+  SetChildBoundsDirect(child, requested_bounds);
+}
+
+// static
+std::unique_ptr<CastWindowManager> CastWindowManager::Create(
+    bool enable_input) {
+  return base::WrapUnique(new CastWindowManagerAura(enable_input));
+}
+
+CastWindowManagerAura::CastWindowManagerAura(bool enable_input)
+    : enable_input_(enable_input) {}
+
+CastWindowManagerAura::~CastWindowManagerAura() {
+  TearDown();
+}
+
+void CastWindowManagerAura::Setup() {
+  if (window_tree_host_) {
+    return;
+  }
+  DCHECK(display::Screen::GetScreen());
+
+  ui::InitializeInputMethodForTesting();
+
+  gfx::Size display_size =
+      display::Screen::GetScreen()->GetPrimaryDisplay().GetSizeInPixel();
+  LOG(INFO) << "Starting window manager, screen size: " << display_size.width()
+            << "x" << display_size.height();
+  CHECK(aura::Env::GetInstance());
+  window_tree_host_.reset(
+      new CastWindowTreeHost(enable_input_, gfx::Rect(display_size)));
+  window_tree_host_->InitHost();
+  window_tree_host_->window()->SetLayoutManager(new CastLayoutManager());
+
+  // Allow seeing through to the hardware video plane:
+  window_tree_host_->compositor()->SetHostHasTransparentBackground(true);
+  window_tree_host_->compositor()->SetBackgroundColor(SK_ColorTRANSPARENT);
+
+  capture_client_.reset(
+      new aura::client::DefaultCaptureClient(window_tree_host_->window()));
+
+  CastVSyncSettings::GetInstance()->AddObserver(this);
+  window_tree_host_->compositor()->SetAuthoritativeVSyncInterval(
+      CastVSyncSettings::GetInstance()->GetVSyncInterval());
+
+  window_tree_host_->Show();
+}
+
+void CastWindowManagerAura::TearDown() {
+  if (!window_tree_host_) {
+    return;
+  }
+  CastVSyncSettings::GetInstance()->RemoveObserver(this);
+  capture_client_.reset();
+  window_tree_host_.reset();
+}
+
+void CastWindowManagerAura::AddWindow(gfx::NativeView child) {
+  LOG(INFO) << "Adding window: " << child->id() << ": " << child->GetName();
+  Setup();
+
+  DCHECK(child);
+  aura::Window* parent = window_tree_host_->window();
+  if (!parent->Contains(child)) {
+    parent->AddChild(child);
+  }
+
+  parent->StackChildAtTop(child);
+  child->SetBounds(window_tree_host_->window()->bounds());
+}
+
+void CastWindowManagerAura::OnVSyncIntervalChanged(base::TimeDelta interval) {
+  DCHECK(window_tree_host_.get());
+  window_tree_host_->compositor()->SetAuthoritativeVSyncInterval(interval);
+}
+
+}  // namespace chromecast