Add the beginning of a simple window manager that we'll support on Windows.

mash/wm/wm.cc

+// Copyright 2016 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 "mash/wm/wm.h"
+
+#include <utility>
+
+#include "services/service_manager/public/cpp/connector.h"
+#include "services/service_manager/public/cpp/service_context.h"
+#include "services/service_manager/public/cpp/service_runner.h"
+#include "services/ui/public/cpp/window.h"
+#include "services/ui/public/cpp/window_tree_client.h"
+
+namespace mash {
+namespace wm {
+
+////////////////////////////////////////////////////////////////////////////////
+// Service, public:
+
+WM::WM() {}
+WM::~WM() {}
+
+////////////////////////////////////////////////////////////////////////////////
+// Service, service_manager::Service implementation:
+
+void WM::OnStart() {
+  window_tree_client_.reset(new ui::WindowTreeClient(this, this));
+  window_tree_client_->ConnectAsWindowManager(context()->connector());
+}
+
+bool WM::OnConnect(const service_manager::ServiceInfo& remote_info,
+                   service_manager::InterfaceRegistry* registry) {
+  return true;
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// Service, ui::WindowTreeClientDelegate implementation:
+void WM::OnEmbed(ui::Window* root) {
+  // WindowTreeClients configured as the window manager should never get
+  // OnEmbed().
+  NOTREACHED();
+}
+void WM::OnLostConnection(ui::WindowTreeClient* client) {
+  window_tree_client_.reset();
+}
+void WM::OnEmbedRootDestroyed(ui::Window* root) {
+  // WindowTreeClients configured as the window manager should never get
+  // OnEmbedRootDestroyed().
+  NOTREACHED();
+}
+void WM::OnPointerEventObserved(const ui::PointerEvent& event,
+                                ui::Window* target) {
+  // Don't care.
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// Service, ui::WindowManagerDelegate implementation:
+
+void WM::SetWindowManagerClient(ui::WindowManagerClient* client) {
+  window_manager_client_ = client;
+}
+bool WM::OnWmSetBounds(ui::Window* window, gfx::Rect* bounds) {
+  return true;
+}
+bool WM::OnWmSetProperty(
+    ui::Window* window,
+    const std::string& name,
+    std::unique_ptr<std::vector<uint8_t>>* new_data) {
+  return true;
+}
+ui::Window* WM::OnWmCreateTopLevelWindow(
+    std::map<std::string, std::vector<uint8_t>>* properties) {
+  ui::Window* window = root_->window_tree()->NewWindow(properties);
+  window->SetBounds(gfx::Rect(10, 10, 500, 500));
+  root_->AddChild(window);
+  return window;
+}
+void WM::OnWmClientJankinessChanged(
+    const std::set<ui::Window*>& client_windows, bool janky) {
+  // Don't care.
+}
+void WM::OnWmNewDisplay(ui::Window* window,
+                        const display::Display& display) {
+  // Only handles a single root.
+  DCHECK(!root_);
+  root_ = window;
+  DCHECK(window_manager_client_);
+  window_manager_client_->AddActivationParent(root_);
+  ui::mojom::FrameDecorationValuesPtr frame_decoration_values =
+      ui::mojom::FrameDecorationValues::New();
+  frame_decoration_values->max_title_bar_button_width = 0;
+  window_manager_client_->SetFrameDecorationValues(
+      std::move(frame_decoration_values));
+}
+void WM::OnWmDisplayRemoved(ui::Window* window) {
+  window->Destroy();
+}
+void WM::OnWmDisplayModified(const display::Display& display) {}
+void WM::OnWmPerformMoveLoop(ui::Window* window,
+                             ui::mojom::MoveLoopSource source,
+                             const gfx::Point& cursor_location,
+                             const base::Callback<void(bool)>& on_done) {
+  // Don't care.
+}
+void WM::OnWmCancelMoveLoop(ui::Window* window) {}
+
+}  // namespace wm
+}  // namespace mash