Add a basic browser to mash that uses the navigation service.

mash/browser/browser.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/browser/browser.h"
+
+#include "base/macros.h"
+#include "base/memory/weak_ptr.h"
+#include "base/message_loop/message_loop.h"
+#include "base/strings/string16.h"
+#include "base/strings/string_util.h"
+#include "base/strings/utf_string_conversions.h"
+#include "base/timer/timer.h"
+#include "components/mus/public/cpp/window.h"
+#include "components/mus/public/cpp/window_tree_connection.h"
+#include "mash/public/interfaces/launchable.mojom.h"
+#include "mojo/converters/geometry/geometry_type_converters.h"
+#include "mojo/public/c/system/main.h"
+#include "services/navigation/public/interfaces/view.mojom.h"
+#include "services/shell/public/cpp/application_runner.h"
+#include "services/shell/public/cpp/connector.h"
+#include "services/shell/public/cpp/shell_client.h"
+#include "services/tracing/public/cpp/tracing_impl.h"
+#include "ui/aura/mus/mus_util.h"
+#include "ui/gfx/canvas.h"
+#include "ui/gfx/paint_throbber.h"
+#include "ui/gfx/text_constants.h"
+#include "ui/native_theme/native_theme.h"
+#include "ui/views/background.h"
+#include "ui/views/controls/button/label_button.h"
+#include "ui/views/controls/textfield/textfield.h"
+#include "ui/views/controls/textfield/textfield_controller.h"
+#include "ui/views/mus/aura_init.h"
+#include "ui/views/mus/window_manager_connection.h"
+#include "ui/views/widget/widget_delegate.h"
+#include "url/gurl.h"
+
+namespace views {
+class AuraInit;

[sky, 2016/05/16 15:31:58]

You shouldn't need to forward declare this as you have the include on line 33.

+}
+
+namespace mash {
+namespace browser {
+
+void EnableButton(views::CustomButton* button, bool enabled) {
+  button->SetState(enabled ? views::Button::STATE_NORMAL
+                           : views::Button::STATE_DISABLED);
+}
+
+class ProgressBar : public views::View {

[sky, 2016/05/16 15:31:58]

Did you try using the ProgressBar in views?

+ public:
+  ProgressBar() {}
+  ~ProgressBar() override {}
+
+  void SetProgress(double progress) {
+    progress_ = progress;
+    SchedulePaint();
+  }
+
+ private:
+  void OnPaint(gfx::Canvas* canvas) override {
+    if (progress_ == 0.f) {
+      gfx::Rect progress_rect = GetLocalBounds();
+      progress_rect.set_y(progress_rect.bottom() - 1);
+      progress_rect.set_height(1);
+      canvas->FillRect(progress_rect, SK_ColorGRAY);
+    } else {
+      gfx::Rect progress_rect = GetLocalBounds();
+      progress_rect.set_width(progress_rect.width() * progress_);
+      canvas->FillRect(progress_rect, SK_ColorRED);
+    }
+  }
+
+  double progress_ = 0.f;
+
+  DISALLOW_COPY_AND_ASSIGN(ProgressBar);
+};
+
+class Throbber : public views::View {
+ public:
+  Throbber() : timer_(false, true), weak_factory_(this) {}
+  ~Throbber() override {}
+
+  void Throb() {

[sky, 2016/05/16 15:31:58]

nit: you have a Stop(), I would be inclined to call this Start().

+    throbbing_ = true;

[sky, 2016/05/16 15:31:58]

DCHECK(!throbbing_), or perhaps early out if already throbbing.

+    start_time_ = base::TimeTicks();

[sky, 2016/05/16 15:31:58]

base::TimeTicks::Now()?

+    SchedulePaint();
+    timer_.Start(
+        FROM_HERE, base::TimeDelta::FromMilliseconds(16),

[sky, 2016/05/16 15:31:58]

You sure you want 16? We changed chrome to 30 a while back.

+        base::Bind(&Throbber::SchedulePaint,
+                   weak_factory_.GetWeakPtr()));
+  }
+
+  void Stop() {
+    throbbing_ = false;
+    if (timer_.IsRunning())
+      timer_.Stop();
+    SchedulePaint();
+  }
+
+ private:
+  void OnPaint(gfx::Canvas* canvas) override {
+    if (!throbbing_)
+      return;
+
+    if (start_time_ == base::TimeTicks())

[sky, 2016/05/16 15:31:58]

How come you set this here and not in Throb?

+      start_time_ = base::TimeTicks::Now();
+
+    gfx::PaintThrobberSpinning(
+        canvas, GetLocalBounds(),
+        GetNativeTheme()->GetSystemColor(
+            ui::NativeTheme::kColorId_ThrobberSpinningColor),
+        base::TimeTicks::Now() - start_time_);
+  }
+
+  bool throbbing_ = false;
+  base::TimeTicks start_time_;
+  base::Timer timer_;
+  base::WeakPtrFactory<Throbber> weak_factory_;
+
+  DISALLOW_COPY_AND_ASSIGN(Throbber);
+};
+
+class UI : public views::WidgetDelegateView,
+           public views::ButtonListener,
+           public views::TextfieldController,
+           public navigation::mojom::ViewClient {
+ public:
+  enum class Type {
+    WINDOW,
+    POPUP
+  };
+
+  UI(Browser* browser,
+     Type type,
+     navigation::mojom::ViewPtr view,
+     navigation::mojom::ViewClientRequest request)
+      : browser_(browser),
+        type_(type),
+        back_button_(new views::LabelButton(this, L"Back")),
+        forward_button_(new views::LabelButton(this, L"Forward")),
+        reload_button_(new views::LabelButton(this, L"Reload")),
+        prompt_(new views::Textfield),
+        throbber_(new Throbber),
+        progress_bar_(new ProgressBar),
+        view_(std::move(view)),
+        view_client_binding_(this, std::move(request)) {
+    set_background(views::Background::CreateStandardPanelBackground());
+    prompt_->set_controller(this);
+    back_button_->set_request_focus_on_press(false);
+    forward_button_->set_request_focus_on_press(false);
+    reload_button_->set_request_focus_on_press(false);
+    AddChildView(back_button_);
+    AddChildView(forward_button_);
+    AddChildView(reload_button_);
+    AddChildView(prompt_);
+    AddChildView(throbber_);
+    AddChildView(progress_bar_);
+  }
+  ~UI() override {
+    browser_->RemoveWindow(GetWidget());
+  }
+
+  void NavigateTo(const GURL& url) {
+    view_->NavigateTo(url);
+  }
+
+ private:
+  // Overridden from views::WidgetDelegate:
+  views::View* GetContentsView() override { return this; }
+  base::string16 GetWindowTitle() const override {
+    // TODO(beng): use resources.
+    if (current_title_.empty())
+      return base::ASCIIToUTF16("Browser");
+    base::string16 format = base::ASCIIToUTF16("%s - Browser");
+    base::ReplaceFirstSubstringAfterOffset(
+        &format, 0, base::ASCIIToUTF16("%s"), current_title_);
+    return format;
+  }
+  bool CanResize() const override { return true; }
+  bool CanMaximize() const override { return true; }
+  bool CanMinimize() const override { return true; }
+
+  // views::ButtonListener:
+  void ButtonPressed(views::Button* sender,
+                     const ui::Event& event) override {
+    if (sender == back_button_) {
+      view_->GoBack();
+    } else if (sender == forward_button_) {
+      view_->GoForward();
+    } else if (sender == reload_button_) {
+      if (is_loading_)
+        view_->Stop();
+      else
+        view_->Reload(false);
+    }
+  }
+
+  // Overridden from views::View:
+  void Layout() override {
+    gfx::Rect local_bounds = GetLocalBounds();
+    gfx::Rect bounds = local_bounds;
+    bounds.Inset(5, 5);
+
+    gfx::Size ps = back_button_->GetPreferredSize();
+    back_button_->SetBoundsRect(
+      gfx::Rect(bounds.x(), bounds.y(), ps.width(), ps.height()));

[sky, 2016/05/16 15:31:58]

nit: run git cl format

+    ps = forward_button_->GetPreferredSize();
+    forward_button_->SetBoundsRect(
+        gfx::Rect(back_button_->bounds().right() + 5, bounds.y(),
+                  ps.width(), ps.height()));
+    ps = reload_button_->GetPreferredSize();
+    reload_button_->SetBoundsRect(
+        gfx::Rect(forward_button_->bounds().right() + 5, bounds.y(),
+                  ps.width(), ps.height()));
+
+    ps = prompt_->GetPreferredSize();
+    int prompt_y =
+        bounds.y() + (reload_button_->bounds().height() - ps.height()) / 2;
+    int width =
+        bounds.width() - reload_button_->bounds().right() - ps.height() - 10;
+    prompt_->SetBoundsRect(
+        gfx::Rect(reload_button_->bounds().right() + 5, prompt_y, width,
+                  ps.height()));
+    throbber_->SetBoundsRect(
+        gfx::Rect(prompt_->bounds().right() + 5, prompt_->bounds().y(),
+                  ps.height(), ps.height()));
+
+    gfx::Rect progress_bar_rect(
+        local_bounds.x(), back_button_->bounds().bottom() + 5,
+        local_bounds.width(), 2);
+    progress_bar_->SetBoundsRect(progress_bar_rect);
+
+    if (content_area_) {
+      int x = local_bounds.x();
+      int y = type_ == Type::POPUP ? 0 : progress_bar_->bounds().bottom();
+      gfx::Point offset(x, y);
+      ConvertPointToWidget(this, &offset);
+      int width = local_bounds.width();
+      int height = local_bounds.height() - y;
+      content_area_->SetBounds(
+          gfx::Rect(offset.x(), offset.y(), width, height));
+    }
+  }
+  void ViewHierarchyChanged(
+      const views::View::ViewHierarchyChangedDetails& details) override {
+    if (details.is_add && GetWidget() && !content_area_) {
+      mus::Window* window = aura::GetMusWindow(GetWidget()->GetNativeWindow());
+      content_area_ = window->connection()->NewWindow(nullptr);
+      window->AddChild(content_area_);
+
+      mus::mojom::WindowTreeClientPtr client;
+      view_->GetWindowTreeClient(GetProxy(&client));
+      content_area_->Embed(std::move(client));
+    }
+  }
+
+  // Overridden from views::TextFieldController:
+  bool HandleKeyEvent(views::Textfield* sender,
+                      const ui::KeyEvent& key_event) override {
+    switch (key_event.key_code()) {
+      case ui::VKEY_RETURN: {
+        view_->NavigateTo(GURL(prompt_->text()));
+      } break;
+      default:
+        break;
+    }
+    return false;
+  }
+
+  // navigation::mojom::ViewClient:
+  void LoadingStateChanged(bool is_loading) override {
+    is_loading_ = is_loading;
+    if (is_loading_) {
+      //reload_button_->SetText(L"Stop");

[sky, 2016/05/16 15:31:58]

?

+      throbber_->Throb();
+    } else {
+      reload_button_->SetText(L"Reload");
+      throbber_->Stop();
+      progress_bar_->SetProgress(0.f);
+    }
+  }
+  void NavigationStateChanged(const GURL& url,
+                              const mojo::String& title,
+                              bool can_go_back,
+                              bool can_go_forward) override {
+    EnableButton(back_button_, can_go_back);
+    EnableButton(forward_button_, can_go_forward);
+    prompt_->SetText(base::UTF8ToUTF16(url.spec()));
+    current_title_ = base::UTF8ToUTF16(title.get());
+    GetWidget()->UpdateWindowTitle();
+  }
+  void LoadProgressChanged(double progress) override {
+    progress_bar_->SetProgress(progress);
+  }
+  void ViewCreated(navigation::mojom::ViewPtr view,
+                   navigation::mojom::ViewClientRequest request,
+                   bool is_popup,
+                   mojo::RectPtr initial_rect,
+                   bool user_gesture) override {
+    views::Widget* window = views::Widget::CreateWindowWithContextAndBounds(
+        new UI(browser_, is_popup ? UI::Type::POPUP : UI::Type::WINDOW,
+               std::move(view), std::move(request)), nullptr,
+               initial_rect.To<gfx::Rect>());
+    window->Show();
+    browser_->AddWindow(window);
+  }
+  void Close() override {
+    GetWidget()->Close();
+  }
+
+  Browser* browser_;
+
+  Type type_;
+
+  views::LabelButton* back_button_;
+  views::LabelButton* forward_button_;
+  views::LabelButton* reload_button_;
+  views::Textfield* prompt_;
+  Throbber* throbber_;
+  ProgressBar* progress_bar_;
+
+  mus::Window* content_area_ = nullptr;
+
+  navigation::mojom::ViewPtr view_;
+  mojo::Binding<navigation::mojom::ViewClient> view_client_binding_;
+
+  bool is_loading_ = false;
+  base::string16 current_title_;
+
+  DISALLOW_COPY_AND_ASSIGN(UI);
+};
+
+Browser::Browser() {}
+Browser::~Browser() {}
+
+void Browser::AddWindow(views::Widget* window) {
+  windows_.push_back(window);
+}
+
+void Browser::RemoveWindow(views::Widget* window) {
+  auto it = std::find(windows_.begin(), windows_.end(), window);
+  DCHECK(it != windows_.end());
+  windows_.erase(it);
+  if (windows_.empty())
+    base::MessageLoop::current()->QuitWhenIdle();
+}
+
+void Browser::Initialize(shell::Connector* connector,
+                         const shell::Identity& identity,
+                         uint32_t id) {
+  connector_ = connector;
+  tracing_.Initialize(connector, identity.name());
+
+  aura_init_.reset(new views::AuraInit(connector, "views_mus_resources.pak"));
+  views::WindowManagerConnection::Create(connector, identity);
+}
+
+bool Browser::AcceptConnection(shell::Connection* connection) {
+  connection->AddInterface<mojom::Launchable>(this);
+  return true;
+}
+
+void Browser::Launch(uint32_t what, mojom::LaunchMode how) {
+  bool reuse = how == mojom::LaunchMode::REUSE ||
+               how == mojom::LaunchMode::DEFAULT;
+  if (reuse && !windows_.empty()) {
+    windows_.back()->Activate();
+    return;
+  }
+
+  navigation::mojom::ViewFactoryPtr view_factory;
+  connector_->ConnectToInterface("exe:navigation", &view_factory);
+  navigation::mojom::ViewPtr view;
+  navigation::mojom::ViewClientPtr view_client;
+  navigation::mojom::ViewClientRequest view_client_request =
+      GetProxy(&view_client);
+  view_factory->CreateView(std::move(view_client), GetProxy(&view));
+  UI* ui = new UI(this, UI::Type::WINDOW, std::move(view),
+                  std::move(view_client_request));
+  views::Widget* window = views::Widget::CreateWindowWithContextAndBounds(
+      ui, nullptr, gfx::Rect(10, 10, 1024, 600));
+  ui->NavigateTo(GURL("http://www.google.com/"));
+  window->Show();
+  AddWindow(window);
+}
+
+void Browser::Create(shell::Connection* connection,
+                     mojom::LaunchableRequest request) {
+  bindings_.AddBinding(this, std::move(request));
+}
+
+}  // namespace browser
+}  // namespace mash