Add rudimentary mash shelf functionality.

mash/shelf/shelf_view.cc

Index: mash/shelf/shelf_view.cc
diff --git a/mash/shelf/shelf_view.cc b/mash/shelf/shelf_view.cc
new file mode 100644
index 0000000000000000000000000000000000000000..6af2a5ad2173da9189737133bd63610168838046
--- /dev/null
+++ b/mash/shelf/shelf_view.cc
@@ -0,0 +1,98 @@
+// 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 "mash/shelf/shelf_view.h"
+
+#include "base/strings/stringprintf.h"
+#include "base/strings/utf_string_conversions.h"
+#include "mojo/shell/public/cpp/application_impl.h"
+#include "ui/gfx/canvas.h"
+#include "ui/views/controls/button/label_button.h"
+#include "ui/views/layout/box_layout.h"
+
+namespace mash {
+namespace shelf {
+
+enum ShelfButtonID {
+  SHELF_BUTTON_VIEWS_EXAMPLES,
+  SHELF_BUTTON_TASK_VIEWER,
+};
+
+ShelfView::ShelfView(mojo::ApplicationImpl* app) : app_(app), binding_(this) {
+  app->ConnectToService("mojo:desktop_wm", &user_window_controller_);
+
+  mash::wm::mojom::UserWindowObserverPtr observer;
+  mojo::InterfaceRequest<mash::wm::mojom::UserWindowObserver> request =
+      mojo::GetProxy(&observer);
+  user_window_controller_->AddUserWindowObserver(std::move(observer));
+  binding_.Bind(std::move(request));
+
+  SetLayoutManager(
+      new views::BoxLayout(views::BoxLayout::kHorizontal, 0, 0, 0));
+
+  views::LabelButton* views_examples =
+      new views::LabelButton(this, base::ASCIIToUTF16("Views Examples"));
+  views_examples->set_tag(SHELF_BUTTON_VIEWS_EXAMPLES);
+  AddChildView(views_examples);
+
+  views::LabelButton* task_viewer =
+      new views::LabelButton(this, base::ASCIIToUTF16("Task Viewer"));
+  task_viewer->set_tag(SHELF_BUTTON_TASK_VIEWER);
+  AddChildView(task_viewer);
+}
+
+ShelfView::~ShelfView() {}
+
+void ShelfView::OnPaint(gfx::Canvas* canvas) {
+  canvas->FillRect(GetLocalBounds(), SK_ColorYELLOW);
+  views::View::OnPaint(canvas);
+}
+
+gfx::Size ShelfView::GetPreferredSize() const {
+  return gfx::Size(1, 48);
+}
+
+views::View* ShelfView::GetContentsView() {
+  return this;
+}
+
+void ShelfView::ButtonPressed(views::Button* sender, const ui::Event& event) {
+  if (sender->tag() == SHELF_BUTTON_VIEWS_EXAMPLES)
+    app_->ConnectToApplication("mojo:views_examples");
+  else if (sender->tag() == SHELF_BUTTON_TASK_VIEWER)
+    app_->ConnectToApplication("mojo:task_viewer");
+  else
+    user_window_controller_->FocusUserWindow(sender->tag());
+}
+
+void ShelfView::OnUserWindowObserverAdded(mojo::Array<uint32_t> window_ids) {
+  for (size_t i = 0; i < window_ids.size(); ++i)
+    OnUserWindowAdded(window_ids[i]);
+}
+
+void ShelfView::OnUserWindowAdded(uint32_t window_id) {
+  // TODO(msw): Get the actual window title and icon.
+  views::LabelButton* open_window_button = new views::LabelButton(
+      this, base::ASCIIToUTF16(base::StringPrintf("Window %d", window_id)));
+  open_window_button->set_tag(window_id);
+  open_window_buttons_.push_back(open_window_button);
+  AddChildView(open_window_button);
+  Layout();
+  SchedulePaint();
+}
+
+void ShelfView::OnUserWindowRemoved(uint32_t window_id) {
+  for (size_t i = 0; i < open_window_buttons_.size(); ++i) {
+    if (static_cast<uint32_t>(open_window_buttons_[i]->tag()) == window_id) {
+      views::LabelButton* button = open_window_buttons_[i];
+      open_window_buttons_.erase(open_window_buttons_.begin() + i);
+      RemoveChildView(button);
+      delete button;
+      return;
+    }
+  }
+}
+
+}  // namespace shelf
+}  // namespace mash