Unified Desktop: hook up ash to allow unified desktop mode

ash/host/ash_window_tree_host_unified.cc

Index: ash/host/ash_window_tree_host_unified.cc
diff --git a/ash/host/ash_window_tree_host_unified.cc b/ash/host/ash_window_tree_host_unified.cc
new file mode 100644
index 0000000000000000000000000000000000000000..4317365fc15e466a752030b5303cc9be6389662c
--- /dev/null
+++ b/ash/host/ash_window_tree_host_unified.cc
@@ -0,0 +1,164 @@
+// Copyright 2015 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 "ash/host/ash_window_tree_host_unified.h"
+#include "ash/host/root_window_transformer.h"
+#include "base/logging.h"
+#include "ui/aura/window.h"
+#include "ui/aura/window_event_dispatcher.h"
+#include "ui/aura/window_targeter.h"
+#include "ui/compositor/compositor.h"
+#include "ui/events/event_processor.h"
+#include "ui/gfx/geometry/insets.h"
+
+namespace ash {
+
+class UnifiedEventTargeter : public aura::WindowTargeter {
+ public:
+  UnifiedEventTargeter(aura::Window* src_root, aura::Window* dst_root)
+      : src_root_(src_root), dst_root_(dst_root) {}
+
+  ui::EventTarget* FindTargetForEvent(ui::EventTarget* root,
+                                      ui::Event* event) override {
+    if (root == src_root_ && !event->target()) {
+      if (event->IsLocatedEvent()) {
+        ui::LocatedEvent* located_event = static_cast<ui::LocatedEvent*>(event);
+        located_event->ConvertLocationToTarget(
+            static_cast<aura::Window*>(nullptr), dst_root_);
+        located_event->UpdateForRootTransform(
+            dst_root_->GetHost()->GetRootTransform());
+      }
+      ignore_result(
+          dst_root_->GetHost()->event_processor()->OnEventFromSource(event));
+      return nullptr;
+    } else {
+      LOG(ERROR) << "Handling Event:" << event->type();
+      return aura::WindowTargeter::FindTargetForEvent(root, event);
+    }
+  }
+
+  aura::Window* src_root_;
+  aura::Window* dst_root_;
+
+  DISALLOW_COPY_AND_ASSIGN(UnifiedEventTargeter);
+};
+
+AshWindowTreeHostUnified::AshWindowTreeHostUnified(
+    const gfx::Rect& initial_bounds)
+    : bounds_(gfx::Rect(initial_bounds.size())) {
+  CreateCompositor(GetAcceleratedWidget());
+}
+
+AshWindowTreeHostUnified::~AshWindowTreeHostUnified() {
+  DestroyCompositor();
+  DestroyDispatcher();
+}
+
+void AshWindowTreeHostUnified::PrepareForShutdown() {
+  for (auto host : mirroring_hosts_)
+    host->PrepareForShutdown();
+}
+
+void AshWindowTreeHostUnified::RegisterMirroringHost(
+    AshWindowTreeHost* mirroring_ash_host) {
+  aura::Window* src_root = mirroring_ash_host->AsWindowTreeHost()->window();
+  src_root->SetEventTargeter(
+      make_scoped_ptr(new UnifiedEventTargeter(src_root, window())));
+  DCHECK(std::find(mirroring_hosts_.begin(), mirroring_hosts_.end(),
+                   mirroring_ash_host) == mirroring_hosts_.end());
+  mirroring_hosts_.push_back(mirroring_ash_host);
+  mirroring_ash_host->AsWindowTreeHost()->window()->AddObserver(this);
+}
+
+void AshWindowTreeHostUnified::ToggleFullScreen() {
+}
+
+bool AshWindowTreeHostUnified::ConfineCursorToRootWindow() {
+  return true;
+}
+
+void AshWindowTreeHostUnified::UnConfineCursor() {
+}
+
+void AshWindowTreeHostUnified::SetRootWindowTransformer(
+    scoped_ptr<RootWindowTransformer> transformer) {
+  // TODO(oshima): Find out if this is neceessary.
+  NOTIMPLEMENTED();
+}
+
+gfx::Insets AshWindowTreeHostUnified::GetHostInsets() const {
+  return gfx::Insets();
+}
+
+aura::WindowTreeHost* AshWindowTreeHostUnified::AsWindowTreeHost() {
+  return this;
+}
+
+ui::EventSource* AshWindowTreeHostUnified::GetEventSource() {
+  return this;
+}
+
+gfx::AcceleratedWidget AshWindowTreeHostUnified::GetAcceleratedWidget() {
+  // TODO(oshima): Enable offscreen compositor.
+  return gfx::kNullAcceleratedWidget;
+}
+
+void AshWindowTreeHostUnified::Show() {
+}
+
+void AshWindowTreeHostUnified::Hide() {
+}
+
+gfx::Rect AshWindowTreeHostUnified::GetBounds() const {
+  return bounds_;
+}
+
+void AshWindowTreeHostUnified::SetBounds(const gfx::Rect& bounds) {
+  if (bounds_.size() == bounds.size())
+    return;
+  bounds_.set_size(bounds.size());
+  OnHostResized(bounds_.size());
+}
+
+void AshWindowTreeHostUnified::SetCapture() {
+}
+
+void AshWindowTreeHostUnified::ReleaseCapture() {
+}
+
+gfx::Point AshWindowTreeHostUnified::GetLocationOnNativeScreen() const {
+  return gfx::Point();
+}
+
+void AshWindowTreeHostUnified::SetCursorNative(gfx::NativeCursor cursor) {
+  for (auto host : mirroring_hosts_)
+    host->AsWindowTreeHost()->SetCursor(cursor);
+}
+
+void AshWindowTreeHostUnified::MoveCursorToNative(const gfx::Point& location) {
+  // TODO(oshima): Find out if this is neceessary.
+  NOTIMPLEMENTED();
+}
+
+void AshWindowTreeHostUnified::OnCursorVisibilityChangedNative(bool show) {
+  for (auto host : mirroring_hosts_)
+    host->AsWindowTreeHost()->OnCursorVisibilityChanged(show);
+}
+
+void AshWindowTreeHostUnified::OnWindowDestroying(aura::Window* window) {
+  auto iter =
+      std::find_if(mirroring_hosts_.begin(), mirroring_hosts_.end(),
+                   [window](AshWindowTreeHost* ash_host) {
+                     return ash_host->AsWindowTreeHost()->window() == window;
+                   });
+  DCHECK(iter != mirroring_hosts_.end());
+  window->RemoveObserver(this);
+  mirroring_hosts_.erase(iter);
+}
+
+ui::EventProcessor* AshWindowTreeHostUnified::GetEventProcessor() {
+  return dispatcher();
+}
+
+}  // namespace ash