Unified Desktop: hook up ash to allow unified desktop mode

ash/host/ash_window_tree_host_virtual.cc

Index: ash/host/ash_window_tree_host_virtual.cc
diff --git a/ash/host/ash_window_tree_host_virtual.cc b/ash/host/ash_window_tree_host_virtual.cc
new file mode 100644
index 0000000000000000000000000000000000000000..32a5ce42ba87a0adbeaff608344691dd63f72dee
--- /dev/null
+++ b/ash/host/ash_window_tree_host_virtual.cc
@@ -0,0 +1,176 @@
+// 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_virtual.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 {
+
+bool IsLocatedEvent(const ui::Event& event) {
+  return event.IsMouseEvent() || event.IsTouchEvent() ||
+         event.IsScrollEvent() || event.IsGestureEvent();
+}
+
+class VirtualEventTargeter : public aura::WindowTargeter {
+ public:
+  VirtualEventTargeter(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 (IsLocatedEvent(*event)) {
+        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(VirtualEventTargeter);
+};
+
+struct AshWindowTreeHostVirtual::PerDisplayData {

[Jun Mukai, 2015/04/26 23:45:08]

I am not sure if PerDisplayData is worthwhile. If it's just a scoped_ptr, I
think we can okay to reveal it.

[oshima, 2015/04/27 17:48:38]

Forgot to remove it. thank you for the catch.

+  scoped_ptr<AshWindowTreeHost> ash_host;
+  PerDisplayData(scoped_ptr<AshWindowTreeHost> ash_host)
+      : ash_host(ash_host.Pass()) {}
+  ~PerDisplayData() {}
+};
+
+AshWindowTreeHostVirtual::AshWindowTreeHostVirtual(
+    const gfx::Rect& initial_bounds)
+    : bounds_(gfx::Rect(initial_bounds.size())) {
+  CreateCompositor(GetAcceleratedWidget());
+}
+
+AshWindowTreeHostVirtual::~AshWindowTreeHostVirtual() {
+  DestroyCompositor();
+  DestroyDispatcher();
+}
+
+void AshWindowTreeHostVirtual::PrepareForShutdown() {
+  for (auto host : mirroring_hosts_)
+    host->PrepareForShutdown();
+}
+
+void AshWindowTreeHostVirtual::RegisterMirroringHost(
+    AshWindowTreeHost* mirroring_ash_host) {
+  aura::Window* src_root = mirroring_ash_host->AsWindowTreeHost()->window();
+  src_root->SetEventTargeter(
+      make_scoped_ptr(new VirtualEventTargeter(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 AshWindowTreeHostVirtual::ToggleFullScreen() {
+}
+
+bool AshWindowTreeHostVirtual::ConfineCursorToRootWindow() {
+  return true;
+}
+
+void AshWindowTreeHostVirtual::UnConfineCursor() {
+}
+
+void AshWindowTreeHostVirtual::SetRootWindowTransformer(
+    scoped_ptr<RootWindowTransformer> transformer) {
+  // TODO(oshima): Find out if this is neceessary.
+  NOTIMPLEMENTED();
+}
+
+gfx::Insets AshWindowTreeHostVirtual::GetHostInsets() const {
+  return gfx::Insets();
+}
+
+aura::WindowTreeHost* AshWindowTreeHostVirtual::AsWindowTreeHost() {
+  return this;
+}
+
+ui::EventSource* AshWindowTreeHostVirtual::GetEventSource() {
+  return this;
+}
+
+gfx::AcceleratedWidget AshWindowTreeHostVirtual::GetAcceleratedWidget() {
+  // TODO(oshima): Enable offscreen compositor.
+  return gfx::kNullAcceleratedWidget;
+}
+
+void AshWindowTreeHostVirtual::Show() {
+}
+
+void AshWindowTreeHostVirtual::Hide() {
+}
+
+gfx::Rect AshWindowTreeHostVirtual::GetBounds() const {
+  return bounds_;
+}
+
+void AshWindowTreeHostVirtual::SetBounds(const gfx::Rect& bounds) {
+  if (bounds_.size() == bounds.size())
+    return;
+  bounds_.set_size(bounds.size());
+  OnHostResized(bounds_.size());
+}
+
+void AshWindowTreeHostVirtual::SetCapture() {
+}
+
+void AshWindowTreeHostVirtual::ReleaseCapture() {
+}
+
+gfx::Point AshWindowTreeHostVirtual::GetLocationOnNativeScreen() const {
+  return gfx::Point();
+}
+
+void AshWindowTreeHostVirtual::SetCursorNative(gfx::NativeCursor cursor) {
+  for (auto host : mirroring_hosts_)
+    host->AsWindowTreeHost()->SetCursor(cursor);
+}
+
+void AshWindowTreeHostVirtual::MoveCursorToNative(const gfx::Point& location) {
+  // TODO(oshima): Find out if this is neceessary.
+  NOTIMPLEMENTED();
+}
+
+void AshWindowTreeHostVirtual::OnCursorVisibilityChangedNative(bool show) {
+  for (auto host : mirroring_hosts_)
+    host->AsWindowTreeHost()->OnCursorVisibilityChanged(show);
+}
+
+void AshWindowTreeHostVirtual::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* AshWindowTreeHostVirtual::GetEventProcessor() {
+  return dispatcher();
+}
+
+}  // namespace ash