Add a skeleton Start Page to the experimental app list.

ui/app_list/views/start_page_view.cc

+// Copyright 2014 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/app_list/views/start_page_view.h"
+
+#include "content/public/browser/web_contents.h"
+#include "ui/app_list/app_list_constants.h"
+#include "ui/app_list/views/app_list_main_view.h"
+#include "ui/app_list/views/search_box_view.h"

[xiyuan, 2014/05/09 07:59:46]

nit: not needed any more.

[calamity, 2014/05/12 03:00:42]

Done.

+#include "ui/gfx/canvas.h"
+#include "ui/views/controls/button/custom_button.h"
+#include "ui/views/controls/webview/webview.h"
+#include "ui/views/layout/box_layout.h"
+
+namespace app_list {
+
+namespace {
+
+const int kTopMargin = 20;
+
+const int kWebViewWidth = 200;
+const int kWebViewHeight = 95;
+
+const int kInstantContainerSpacing = 15;
+const int kBarPlaceholderWidth = 350;
+const int kBarPlaceholderHeight = 30;
+
+// A button that is the placeholder for the search bar in the start page view.
+class BarPlaceholderButton : public views::CustomButton {
+ public:
+  explicit BarPlaceholderButton(views::ButtonListener* listener)
+      : views::CustomButton(listener) {}
+
+  virtual ~BarPlaceholderButton() {}
+
+  // Overridden from views::View:
+  virtual gfx::Size GetPreferredSize() OVERRIDE {
+    return gfx::Size(kBarPlaceholderWidth, kBarPlaceholderHeight);
+  }
+
+  virtual void OnPaint(gfx::Canvas* canvas) OVERRIDE {
+    PaintButton(
+        canvas,
+        state() == STATE_HOVERED ? kPagerHoverColor : kPagerNormalColor);
+  }
+
+ private:
+  // Paints a rectangular button.
+  void PaintButton(gfx::Canvas* canvas, SkColor base_color) {
+    gfx::Rect rect(GetContentsBounds());
+    rect.ClampToCenteredSize(
+        gfx::Size(kBarPlaceholderWidth, kBarPlaceholderHeight));
+
+    SkPaint paint;
+    paint.setAntiAlias(true);
+    paint.setStyle(SkPaint::kFill_Style);
+    paint.setColor(base_color);
+    canvas->DrawRect(rect, paint);
+  }
+
+  DISALLOW_COPY_AND_ASSIGN(BarPlaceholderButton);
+};
+
+}  // namespace
+
+StartPageView::StartPageView(AppListMainView* app_list_main_view,
+                             content::WebContents* start_page_web_contents)
+    : app_list_main_view_(app_list_main_view),
+      instant_container_(new views::View) {
+  AddChildView(instant_container_);
+  SetLayoutManager(new views::BoxLayout(views::BoxLayout::kVertical, 0, 0, 0));

[xiyuan, 2014/05/09 07:59:46]

I assume BoxLayout here is for adding more child views in the future.

[calamity, 2014/05/12 03:00:42]

Yep.

+  instant_container_->SetLayoutManager(new views::BoxLayout(
+      views::BoxLayout::kVertical, 0, kTopMargin, kInstantContainerSpacing));
+
+  views::WebView* web_view =
+      new views::WebView(start_page_web_contents->GetBrowserContext());
+  web_view->SetPreferredSize(gfx::Size(kWebViewWidth, kWebViewHeight));
+  web_view->SetWebContents(start_page_web_contents);
+
+  instant_container_->AddChildView(web_view);
+  instant_container_->AddChildView(new BarPlaceholderButton(this));
+}
+
+StartPageView::~StartPageView() {
+}
+
+void StartPageView::Reset() {
+  instant_container_->SetVisible(true);
+}
+
+void StartPageView::ButtonPressed(views::Button* sender,
+                                  const ui::Event& event) {
+  app_list_main_view_->OnStartPageSearchButtonPressed();
+  instant_container_->SetVisible(false);
+}
+
+}  // namespace app_list