Revert of Remove remote tree host and some related input and metro_driver code

ui/aura/remote_window_tree_host_win.cc

Index: ui/aura/remote_window_tree_host_win.cc
diff --git a/ui/aura/remote_window_tree_host_win.cc b/ui/aura/remote_window_tree_host_win.cc
new file mode 100644
index 0000000000000000000000000000000000000000..a303d98ec9935e17e8309d018fd8d71c8fdfbeb0
--- /dev/null
+++ b/ui/aura/remote_window_tree_host_win.cc
@@ -0,0 +1,522 @@
+// Copyright (c) 2012 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 "ui/aura/remote_window_tree_host_win.h"
+
+#include <windows.h>
+#include <stddef.h>
+
+#include <algorithm>
+
+#include "base/message_loop/message_loop.h"
+#include "ipc/ipc_message.h"
+#include "ipc/ipc_sender.h"
+#include "ui/aura/client/cursor_client.h"
+#include "ui/aura/window_event_dispatcher.h"
+#include "ui/aura/window_property.h"
+#include "ui/base/cursor/cursor_loader_win.h"
+#include "ui/base/ime/composition_text.h"
+#include "ui/base/ime/input_method.h"
+#include "ui/base/ime/remote_input_method_win.h"
+#include "ui/base/ime/text_input_client.h"
+#include "ui/base/view_prop.h"
+#include "ui/events/event_utils.h"
+#include "ui/events/keycodes/keyboard_code_conversion_win.h"
+#include "ui/gfx/geometry/insets.h"
+#include "ui/gfx/win/dpi.h"
+#include "ui/metro_viewer/metro_viewer_messages.h"
+
+namespace aura {
+
+namespace {
+
+const char* kWindowTreeHostWinKey = "__AURA_REMOTE_WINDOW_TREE_HOST_WIN__";
+
+// Sets the keystate for the virtual key passed in to down or up.
+void SetKeyState(uint8_t* key_states,
+                 bool key_down,
+                 uint32_t virtual_key_code) {
+  DCHECK(key_states);
+
+  if (key_down)
+    key_states[virtual_key_code] |= 0x80;
+  else
+    key_states[virtual_key_code] &= 0x7F;
+}
+
+// Sets the keyboard states for the Shift/Control/Alt/Caps lock keys.
+void SetVirtualKeyStates(uint32_t flags) {
+  uint8_t keyboard_state[256] = {0};
+  ::GetKeyboardState(keyboard_state);
+
+  SetKeyState(keyboard_state, !!(flags & ui::EF_SHIFT_DOWN), VK_SHIFT);
+  SetKeyState(keyboard_state, !!(flags & ui::EF_CONTROL_DOWN), VK_CONTROL);
+  SetKeyState(keyboard_state, !!(flags & ui::EF_ALT_DOWN), VK_MENU);
+  SetKeyState(keyboard_state, !!(flags & ui::EF_CAPS_LOCK_ON), VK_CAPITAL);
+  SetKeyState(keyboard_state, !!(flags & ui::EF_LEFT_MOUSE_BUTTON), VK_LBUTTON);
+  SetKeyState(keyboard_state, !!(flags & ui::EF_RIGHT_MOUSE_BUTTON),
+              VK_RBUTTON);
+  SetKeyState(keyboard_state, !!(flags & ui::EF_MIDDLE_MOUSE_BUTTON),
+              VK_MBUTTON);
+
+  ::SetKeyboardState(keyboard_state);
+}
+
+void FillCompositionText(
+    const base::string16& text,
+    int32_t selection_start,
+    int32_t selection_end,
+    const std::vector<metro_viewer::UnderlineInfo>& underlines,
+    ui::CompositionText* composition_text) {
+  composition_text->Clear();
+  composition_text->text = text;
+  composition_text->selection.set_start(selection_start);
+  composition_text->selection.set_end(selection_end);
+  composition_text->underlines.resize(underlines.size());
+  for (size_t i = 0; i < underlines.size(); ++i) {
+    composition_text->underlines[i].start_offset = underlines[i].start_offset;
+    composition_text->underlines[i].end_offset = underlines[i].end_offset;
+    composition_text->underlines[i].color = SK_ColorBLACK;
+    composition_text->underlines[i].thick = underlines[i].thick;
+    composition_text->underlines[i].background_color = SK_ColorTRANSPARENT;
+  }
+}
+
+}  // namespace
+
+RemoteWindowTreeHostWin* g_instance = NULL;
+
+// static
+RemoteWindowTreeHostWin* RemoteWindowTreeHostWin::Instance() {
+  return g_instance;
+}
+
+RemoteWindowTreeHostWin::RemoteWindowTreeHostWin()
+    : remote_window_(NULL),
+      host_(NULL),
+      ignore_mouse_moves_until_set_cursor_ack_(0),
+      event_flags_(0),
+      window_size_(GetSystemMetrics(SM_CXSCREEN),
+                   GetSystemMetrics(SM_CYSCREEN)) {
+  CHECK(!g_instance);
+  g_instance = this;
+  prop_.reset(new ui::ViewProp(NULL, kWindowTreeHostWinKey, this));
+  CreateCompositor();
+  OnAcceleratedWidgetAvailable();
+}
+
+RemoteWindowTreeHostWin::~RemoteWindowTreeHostWin() {
+  DestroyCompositor();
+  DestroyDispatcher();
+  DCHECK_EQ(g_instance, this);
+  g_instance = NULL;
+}
+
+// static
+bool RemoteWindowTreeHostWin::IsValid() {
+  return Instance()->remote_window_ != NULL;
+}
+
+void RemoteWindowTreeHostWin::SetRemoteWindowHandle(HWND remote_window) {
+  remote_window_ = remote_window;
+}
+
+void RemoteWindowTreeHostWin::Connected(IPC::Sender* host) {
+  CHECK(host_ == NULL);
+  DCHECK(remote_window_);
+  host_ = host;
+  // Recreate the compositor for the target surface represented by the
+  // remote_window HWND.
+  CreateCompositor();
+  OnAcceleratedWidgetAvailable();
+  InitCompositor();
+}
+
+void RemoteWindowTreeHostWin::Disconnected() {
+  // Don't CHECK here, Disconnected is called on a channel error which can
+  // happen before we're successfully Connected.
+  if (!host_)
+    return;
+  ui::RemoteInputMethodPrivateWin* remote_input_method_private =
+      GetRemoteInputMethodPrivate();
+  if (remote_input_method_private)
+    remote_input_method_private->SetRemoteDelegate(NULL);
+  host_ = NULL;
+  remote_window_ = NULL;
+}
+
+bool RemoteWindowTreeHostWin::OnMessageReceived(const IPC::Message& message) {
+  bool handled = true;
+  IPC_BEGIN_MESSAGE_MAP(RemoteWindowTreeHostWin, message)
+    IPC_MESSAGE_HANDLER(MetroViewerHostMsg_MouseMoved, OnMouseMoved)
+    IPC_MESSAGE_HANDLER(MetroViewerHostMsg_MouseButton, OnMouseButton)
+    IPC_MESSAGE_HANDLER(MetroViewerHostMsg_KeyDown, OnKeyDown)
+    IPC_MESSAGE_HANDLER(MetroViewerHostMsg_KeyUp, OnKeyUp)
+    IPC_MESSAGE_HANDLER(MetroViewerHostMsg_Character, OnChar)
+    IPC_MESSAGE_HANDLER(MetroViewerHostMsg_WindowActivated,
+                        OnWindowActivated)
+    IPC_MESSAGE_HANDLER(MetroViewerHostMsg_EdgeGesture, OnEdgeGesture)
+    IPC_MESSAGE_HANDLER(MetroViewerHostMsg_TouchDown,
+                        OnTouchDown)
+    IPC_MESSAGE_HANDLER(MetroViewerHostMsg_TouchUp,
+                        OnTouchUp)
+    IPC_MESSAGE_HANDLER(MetroViewerHostMsg_TouchMoved,
+                        OnTouchMoved)
+    IPC_MESSAGE_HANDLER(MetroViewerHostMsg_SetCursorPosAck,
+                        OnSetCursorPosAck)
+    IPC_MESSAGE_HANDLER(MetroViewerHostMsg_ImeCandidatePopupChanged,
+                        OnImeCandidatePopupChanged)
+    IPC_MESSAGE_HANDLER(MetroViewerHostMsg_ImeCompositionChanged,
+                        OnImeCompositionChanged)
+    IPC_MESSAGE_HANDLER(MetroViewerHostMsg_ImeTextCommitted,
+                        OnImeTextCommitted)
+    IPC_MESSAGE_HANDLER(MetroViewerHostMsg_ImeInputSourceChanged,
+                        OnImeInputSourceChanged)
+    IPC_MESSAGE_UNHANDLED(handled = false)
+  IPC_END_MESSAGE_MAP()
+  return handled;
+}
+
+void RemoteWindowTreeHostWin::HandleOpenURLOnDesktop(
+    const base::FilePath& shortcut,
+    const base::string16& url) {
+  if (!host_)
+    return;
+  host_->Send(new MetroViewerHostMsg_OpenURLOnDesktop(shortcut, url));
+}
+
+void RemoteWindowTreeHostWin::HandleWindowSizeChanged(uint32_t width,
+                                                      uint32_t height) {
+  SetBounds(gfx::Rect(0, 0, width, height));
+}
+
+bool RemoteWindowTreeHostWin::IsForegroundWindow() {
+  return ::GetForegroundWindow() == remote_window_;
+}
+
+Window* RemoteWindowTreeHostWin::GetAshWindow() {
+  return window();
+}
+
+ui::EventSource* RemoteWindowTreeHostWin::GetEventSource() {
+  return this;
+}
+
+gfx::AcceleratedWidget RemoteWindowTreeHostWin::GetAcceleratedWidget() {
+  if (remote_window_)
+    return remote_window_;
+  // Getting here should only happen for ash_unittests.exe and related code.
+  return ::GetDesktopWindow();
+}
+
+void RemoteWindowTreeHostWin::ShowImpl() {
+  ui::RemoteInputMethodPrivateWin* remote_input_method_private =
+      GetRemoteInputMethodPrivate();
+  if (remote_input_method_private)
+    remote_input_method_private->SetRemoteDelegate(this);
+}
+
+void RemoteWindowTreeHostWin::HideImpl() {
+  NOTIMPLEMENTED();
+}
+
+gfx::Rect RemoteWindowTreeHostWin::GetBounds() const {
+  return gfx::Rect(window_size_);
+}
+
+void RemoteWindowTreeHostWin::SetBounds(const gfx::Rect& bounds) {
+  window_size_ = bounds.size();
+  OnHostResized(bounds.size());
+}
+
+gfx::Point RemoteWindowTreeHostWin::GetLocationOnNativeScreen() const {
+  return gfx::Point(0, 0);
+}
+
+void RemoteWindowTreeHostWin::SetCapture() {
+}
+
+void RemoteWindowTreeHostWin::ReleaseCapture() {
+}
+
+void RemoteWindowTreeHostWin::SetCursorNative(gfx::NativeCursor native_cursor) {
+  if (!host_)
+    return;
+  host_->Send(
+      new MetroViewerHostMsg_SetCursor(uint64_t(native_cursor.platform())));
+}
+
+void RemoteWindowTreeHostWin::MoveCursorToNative(const gfx::Point& location) {
+  VLOG(1) << "In MoveCursorTo: " << location.x() << ", " << location.y();
+  if (!host_)
+    return;
+
+  // This function can be called in cases like when the mouse cursor is
+  // restricted within a viewport (For e.g. LockCursor) which assumes that
+  // subsequent mouse moves would be received starting with the new cursor
+  // coordinates. This is a challenge for Windows ASH for the reasons
+  // outlined below.
+  // Other cases which don't expect this behavior should continue to work
+  // without issues.
+
+  // The mouse events are received by the viewer process and sent to the
+  // browser. If we invoke the SetCursor API here we continue to receive
+  // mouse messages from the viewer which were posted before the SetCursor
+  // API executes which messes up the state in the browser. To workaround
+  // this we invoke the SetCursor API in the viewer process and ignore
+  // mouse messages until we received an ACK from the viewer indicating that
+  // the SetCursor operation completed.
+  ignore_mouse_moves_until_set_cursor_ack_++;
+  VLOG(1) << "In MoveCursorTo. Sending IPC";
+  host_->Send(new MetroViewerHostMsg_SetCursorPos(location.x(), location.y()));
+}
+
+void RemoteWindowTreeHostWin::OnCursorVisibilityChangedNative(bool show) {
+  NOTIMPLEMENTED();
+}
+
+void RemoteWindowTreeHostWin::CancelComposition() {
+  if (!host_)
+    return;
+  host_->Send(new MetroViewerHostMsg_ImeCancelComposition);
+}
+
+void RemoteWindowTreeHostWin::OnTextInputClientUpdated(
+    const std::vector<int32_t>& input_scopes,
+    const std::vector<gfx::Rect>& composition_character_bounds) {
+  if (!host_)
+    return;
+  std::vector<metro_viewer::CharacterBounds> character_bounds;
+  for (size_t i = 0; i < composition_character_bounds.size(); ++i) {
+    const gfx::Rect& rect = composition_character_bounds[i];
+    metro_viewer::CharacterBounds bounds;
+    bounds.left = rect.x();
+    bounds.top = rect.y();
+    bounds.right = rect.right();
+    bounds.bottom = rect.bottom();
+    character_bounds.push_back(bounds);
+  }
+  host_->Send(new MetroViewerHostMsg_ImeTextInputClientUpdated(
+      input_scopes, character_bounds));
+}
+
+gfx::Point PointFromNativeEvent(int32_t x, int32_t y) {
+  static float scale_factor = gfx::GetDPIScale();
+  gfx::Point result( x * scale_factor, y * scale_factor);
+  return result;
+}
+
+void RemoteWindowTreeHostWin::OnMouseMoved(int32_t x,
+                                           int32_t y,
+                                           int32_t flags) {
+  if (ignore_mouse_moves_until_set_cursor_ack_)
+    return;
+
+  gfx::Point location = PointFromNativeEvent(x, y);
+  ui::MouseEvent event(ui::ET_MOUSE_MOVED, location, location,
+                       ui::EventTimeForNow(), flags, 0);
+  SendEventToProcessor(&event);
+}
+
+void RemoteWindowTreeHostWin::OnMouseButton(
+    const MetroViewerHostMsg_MouseButtonParams& params) {
+  gfx::Point location = PointFromNativeEvent(params.x, params.y);
+  ui::MouseEvent mouse_event(
+      params.event_type, location, location, ui::EventTimeForNow(),
+      static_cast<int>(params.flags), static_cast<int>(params.changed_button));
+
+  SetEventFlags(params.flags | key_event_flags());
+  if (params.event_type == ui::ET_MOUSEWHEEL) {
+    int x_offset = params.is_horizontal_wheel ? params.extra : 0;
+    int y_offset = !params.is_horizontal_wheel ? params.extra : 0;
+    ui::MouseWheelEvent wheel_event(mouse_event, x_offset, y_offset);
+    SendEventToProcessor(&wheel_event);
+  } else if (params.event_type == ui::ET_MOUSE_PRESSED) {
+    // TODO(shrikant): Ideally modify code in event.cc by adding automatic
+    // tracking of double clicks in synthetic MouseEvent constructor code.
+    // Non-synthetic MouseEvent constructor code does automatically track
+    // this. Need to use some caution while modifying synthetic constructor
+    // as many tests and other code paths depend on it and apparently
+    // specifically depend on non implicit tracking of previous mouse event.
+    if (last_mouse_click_event_ &&
+        ui::MouseEvent::IsRepeatedClickEvent(mouse_event,
+                                             *last_mouse_click_event_)) {
+      mouse_event.SetClickCount(2);
+    } else {
+      mouse_event.SetClickCount(1);
+    }
+    last_mouse_click_event_ .reset(new ui::MouseEvent(mouse_event));
+    SendEventToProcessor(&mouse_event);
+  } else {
+    SendEventToProcessor(&mouse_event);
+  }
+}
+
+void RemoteWindowTreeHostWin::OnKeyDown(uint32_t vkey,
+                                        uint32_t repeat_count,
+                                        uint32_t scan_code,
+                                        uint32_t flags) {
+  DispatchKeyboardMessage(ui::ET_KEY_PRESSED, vkey, repeat_count, scan_code,
+                          flags, false);
+}
+
+void RemoteWindowTreeHostWin::OnKeyUp(uint32_t vkey,
+                                      uint32_t repeat_count,
+                                      uint32_t scan_code,
+                                      uint32_t flags) {
+  DispatchKeyboardMessage(ui::ET_KEY_RELEASED, vkey, repeat_count, scan_code,
+                          flags, false);
+}
+
+void RemoteWindowTreeHostWin::OnChar(uint32_t key_code,
+                                     uint32_t repeat_count,
+                                     uint32_t scan_code,
+                                     uint32_t flags) {
+  DispatchKeyboardMessage(ui::ET_KEY_PRESSED, key_code, repeat_count,
+                          scan_code, flags, true);
+}
+
+void RemoteWindowTreeHostWin::OnWindowActivated(bool repaint) {
+  OnHostActivated();
+  if (repaint && compositor())
+    compositor()->ScheduleFullRedraw();
+}
+
+void RemoteWindowTreeHostWin::OnEdgeGesture() {
+  ui::GestureEvent event(
+      0,
+      0,
+      0,
+      ui::EventTimeForNow(),
+      ui::GestureEventDetails(ui::ET_GESTURE_WIN8_EDGE_SWIPE));
+  SendEventToProcessor(&event);
+}
+
+void RemoteWindowTreeHostWin::OnTouchDown(int32_t x,
+                                          int32_t y,
+                                          uint64_t timestamp,
+                                          uint32_t pointer_id) {
+  gfx::Point location = PointFromNativeEvent(x, y);
+  ui::TouchEvent event(ui::ET_TOUCH_PRESSED,
+                       location,
+                       pointer_id,
+                       base::TimeDelta::FromMicroseconds(timestamp));
+  SendEventToProcessor(&event);
+}
+
+void RemoteWindowTreeHostWin::OnTouchUp(int32_t x,
+                                        int32_t y,
+                                        uint64_t timestamp,
+                                        uint32_t pointer_id) {
+  gfx::Point location = PointFromNativeEvent(x, y);
+  ui::TouchEvent event(ui::ET_TOUCH_RELEASED,
+                       location,
+                       pointer_id,
+                       base::TimeDelta::FromMicroseconds(timestamp));
+  SendEventToProcessor(&event);
+}
+
+void RemoteWindowTreeHostWin::OnTouchMoved(int32_t x,
+                                           int32_t y,
+                                           uint64_t timestamp,
+                                           uint32_t pointer_id) {
+  gfx::Point location = PointFromNativeEvent(x, y);
+  ui::TouchEvent event(ui::ET_TOUCH_MOVED,
+                       location,
+                       pointer_id,
+                       base::TimeDelta::FromMicroseconds(timestamp));
+  SendEventToProcessor(&event);
+}
+
+void RemoteWindowTreeHostWin::OnSetCursorPosAck() {
+  DCHECK_GT(ignore_mouse_moves_until_set_cursor_ack_, 0);
+  ignore_mouse_moves_until_set_cursor_ack_--;
+}
+
+ui::RemoteInputMethodPrivateWin*
+RemoteWindowTreeHostWin::GetRemoteInputMethodPrivate() {
+  return ui::RemoteInputMethodPrivateWin::Get(GetInputMethod());
+}
+
+void RemoteWindowTreeHostWin::OnImeCandidatePopupChanged(bool visible) {
+  ui::RemoteInputMethodPrivateWin* remote_input_method_private =
+      GetRemoteInputMethodPrivate();
+  if (!remote_input_method_private)
+    return;
+  remote_input_method_private->OnCandidatePopupChanged(visible);
+}
+
+void RemoteWindowTreeHostWin::OnImeCompositionChanged(
+    const base::string16& text,
+    int32_t selection_start,
+    int32_t selection_end,
+    const std::vector<metro_viewer::UnderlineInfo>& underlines) {
+  ui::RemoteInputMethodPrivateWin* remote_input_method_private =
+      GetRemoteInputMethodPrivate();
+  if (!remote_input_method_private)
+    return;
+  ui::CompositionText composition_text;
+  FillCompositionText(
+      text, selection_start, selection_end, underlines, &composition_text);
+  remote_input_method_private->OnCompositionChanged(composition_text);
+}
+
+void RemoteWindowTreeHostWin::OnImeTextCommitted(const base::string16& text) {
+  ui::RemoteInputMethodPrivateWin* remote_input_method_private =
+      GetRemoteInputMethodPrivate();
+  if (!remote_input_method_private)
+    return;
+  remote_input_method_private->OnTextCommitted(text);
+}
+
+void RemoteWindowTreeHostWin::OnImeInputSourceChanged(uint16_t language_id,
+                                                      bool is_ime) {
+  ui::RemoteInputMethodPrivateWin* remote_input_method_private =
+      GetRemoteInputMethodPrivate();
+  if (!remote_input_method_private)
+    return;
+  remote_input_method_private->OnInputSourceChanged(language_id, is_ime);
+}
+
+void RemoteWindowTreeHostWin::DispatchKeyboardMessage(ui::EventType type,
+                                                      uint32_t vkey,
+                                                      uint32_t repeat_count,
+                                                      uint32_t scan_code,
+                                                      uint32_t flags,
+                                                      bool is_character) {
+  SetEventFlags(flags | mouse_event_flags());
+  if (base::MessageLoop::current()->IsNested()) {
+    int index = (flags & ui::EF_ALT_DOWN) ? 1 : 0;
+    const int char_message[] = {WM_CHAR, WM_SYSCHAR};
+    const int keydown_message[] = {WM_KEYDOWN, WM_SYSKEYDOWN};
+    const int keyup_message[] = {WM_KEYUP, WM_SYSKEYUP};
+    uint32_t message =
+        is_character ? char_message[index]
+                     : (type == ui::ET_KEY_PRESSED ? keydown_message[index]
+                                                   : keyup_message[index]);
+    ::PostThreadMessage(::GetCurrentThreadId(),
+                        message,
+                        vkey,
+                        repeat_count | scan_code >> 15);
+  } else if (is_character) {
+    ui::KeyEvent event(static_cast<base::char16>(vkey),
+                       ui::KeyboardCodeForWindowsKeyCode(vkey),
+                       flags);
+    SendEventToProcessor(&event);
+  } else {
+    ui::KeyEvent event(type,
+                       ui::KeyboardCodeForWindowsKeyCode(vkey),
+                       flags);
+    SendEventToProcessor(&event);
+  }
+}
+
+void RemoteWindowTreeHostWin::SetEventFlags(uint32_t flags) {
+  if (flags == event_flags_)
+    return;
+  event_flags_ = flags;
+  SetVirtualKeyStates(event_flags_);
+}
+
+}  // namespace aura