Initial cut of ash/wm/common classes for mus

mash/wm/bridge/mus_layout_manager_adapter.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/bridge/mus_layout_manager_adapter.h"
+
+#include "ash/wm/common/wm_layout_manager.h"
+#include "components/mus/public/cpp/window.h"
+#include "mash/wm/bridge/wm_window_mus.h"
+
+namespace mash {
+namespace wm {
+
+MusLayoutManagerAdapter::ChildWindowObserver::ChildWindowObserver(
+    MusLayoutManagerAdapter* adapter)
+    : adapter_(adapter) {}
+
+MusLayoutManagerAdapter::ChildWindowObserver::~ChildWindowObserver() {}
+
+void MusLayoutManagerAdapter::ChildWindowObserver::OnWindowVisibilityChanged(
+    mus::Window* window) {
+  adapter_->layout_manager_->OnChildWindowVisibilityChanged(
+      WmWindowMus::Get(window), window->visible());
+}
+
+MusLayoutManagerAdapter::MusLayoutManagerAdapter(
+    mus::Window* window,
+    std::unique_ptr<ash::wm::WmLayoutManager> layout_manager)
+    : window_(window),
+      child_window_observer_(this),
+      layout_manager_(std::move(layout_manager)) {
+  window_->AddObserver(this);
+  for (mus::Window* child : window_->children())
+    child->AddObserver(&child_window_observer_);
+}
+
+MusLayoutManagerAdapter::~MusLayoutManagerAdapter() {
+  for (mus::Window* child : window_->children())
+    child->RemoveObserver(&child_window_observer_);
+
+  window_->RemoveObserver(this);
+}
+
+void MusLayoutManagerAdapter::OnTreeChanging(const TreeChangeParams& params) {
+  if (params.old_parent == window_) {
+    layout_manager_->OnWillRemoveWindowFromLayout(
+        WmWindowMus::Get(params.target));
+  }
+}
+
+void MusLayoutManagerAdapter::OnTreeChanged(const TreeChangeParams& params) {
+  if (params.new_parent == window_) {
+    layout_manager_->OnWindowAddedToLayout(WmWindowMus::Get(params.target));
+  } else if (params.old_parent == window_) {
+    params.target->RemoveObserver(&child_window_observer_);
+    layout_manager_->OnWindowRemovedFromLayout(WmWindowMus::Get(params.target));
+  }
+}
+
+void MusLayoutManagerAdapter::OnWindowBoundsChanged(
+    mus::Window* window,
+    const gfx::Rect& old_bounds,
+    const gfx::Rect& new_bounds) {
+  layout_manager_->OnWindowResized();

[James Cook, 2016/05/06 19:46:46]

Is this the place where the SetChildBounds() call mentioned in the class comment
happens? If so, maybe worth mentioning that?

[sky, 2016/05/06 22:12:57]

This call is different. This call is to tell the layoutmanager the window the
layoutmanager is associated with has been resized. In other words, |window|
isn't a child.

+}
+
+}  // namespace wm
+}  // namespace mash