Enable accelerators on web activity window

athena/content/web_activity.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 "athena/content/web_activity.h"
 
 #include "athena/activity/public/activity_manager.h"
+#include "athena/input/public/accelerator_manager.h"
+#include "content/public/browser/native_web_keyboard_event.h"
 #include "content/public/browser/web_contents.h"
+#include "ui/views/controls/webview/unhandled_keyboard_event_handler.h"
 #include "ui/views/controls/webview/webview.h"
+#include "ui/views/focus/focus_manager.h"
 
 namespace athena {
+namespace {
+
+class WebActivityController : public AcceleratorHandler {
+ public:
+  enum Command {
+    CMD_BACK,
+    CMD_FORWARD,
+    CMD_RELOAD,
+    CMD_RELOAD_IGNORE_CACHE,
+  };
+
+  explicit WebActivityController(views::WebView* web_view)
+      : web_view_(web_view), reserved_accelerator_enabled_(true) {}
+  virtual ~WebActivityController() {}
+
+  // Installs accelerators for web activity.
+  void InstallAccelerators() {
+    accelerator_manager_ = AcceleratorManager::CreateForFocusManager(
+                               web_view_->GetFocusManager()).Pass();
+    const AcceleratorData accelerator_data[] = {
+        {TRIGGER_ON_PRESS, ui::VKEY_R, ui::EF_CONTROL_DOWN, CMD_RELOAD,
+         AF_NONE},
+        {TRIGGER_ON_PRESS, ui::VKEY_BROWSER_REFRESH, ui::EF_NONE, CMD_RELOAD,
+         AF_NONE},
+        {TRIGGER_ON_PRESS, ui::VKEY_BROWSER_REFRESH, ui::EF_CONTROL_DOWN,
+         CMD_RELOAD_IGNORE_CACHE, AF_NONE},
+        {TRIGGER_ON_PRESS, ui::VKEY_BROWSER_FORWARD, ui::EF_NONE, CMD_FORWARD,
+         AF_NONE},
+        {TRIGGER_ON_PRESS, ui::VKEY_BROWSER_BACK, ui::EF_NONE, CMD_BACK,
+         AF_NONE},
+    };
+    accelerator_manager_->RegisterAccelerators(
+        accelerator_data, arraysize(accelerator_data), this);
+  }
+
+  // Methods that are called before and after key events are consumed by the web
+  // contents.
+  // See the documentation in WebContentsDelegate: for more details.
+  bool PreHandleKeyboardEvent(content::WebContents* source,
+                              const content::NativeWebKeyboardEvent& event,
+                              bool* is_keyboard_shortcut) {
+    ui::Accelerator accelerator(
+        static_cast<ui::KeyboardCode>(event.windowsKeyCode),
+        content::GetModifiersFromNativeWebKeyboardEvent(event));
+    if (event.type == blink::WebInputEvent::KeyUp)
+      accelerator.set_type(ui::ET_KEY_RELEASED);
+
+    if (reserved_accelerator_enabled_ &&
+        accelerator_manager_->IsRegistered(accelerator, AF_RESERVED)) {
+      return web_view_->GetFocusManager()->ProcessAccelerator(accelerator);
+    }
+    *is_keyboard_shortcut =
+        accelerator_manager_->IsRegistered(accelerator, AF_NONE);
+    return false;
+  }
+
+  void HandleKeyboardEvent(content::WebContents* source,
+                           const content::NativeWebKeyboardEvent& event) {
+    unhandled_keyboard_event_handler_.HandleKeyboardEvent(
+        event, web_view_->GetFocusManager());
+  }
+
+ private:
+  // AcceleratorHandler:
+  virtual bool IsCommandEnabled(int command_id) const OVERRIDE {
+    switch (command_id) {
+      case CMD_RELOAD:
+        return true;
+      case CMD_BACK:
+        return web_view_->GetWebContents()->GetController().CanGoBack();
+      case CMD_FORWARD:
+        return web_view_->GetWebContents()->GetController().CanGoForward();
+    }
+    return false;
+  }
+
+  virtual bool OnAcceleratorFired(int command_id,
+                                  const ui::Accelerator& accelerator) OVERRIDE {
+    switch (command_id) {
+      case CMD_RELOAD:
+        web_view_->GetWebContents()->GetController().Reload(false);
+        return true;
+      case CMD_RELOAD_IGNORE_CACHE:
+        web_view_->GetWebContents()->GetController().ReloadIgnoringCache(false);
+        return true;
+      case CMD_BACK:
+        web_view_->GetWebContents()->GetController().GoBack();
+        return true;
+      case CMD_FORWARD:
+        web_view_->GetWebContents()->GetController().GoForward();
+        return true;
+    }
+    return false;
+  }
+
+  views::WebView* web_view_;
+  bool reserved_accelerator_enabled_;
+  scoped_ptr<AcceleratorManager> accelerator_manager_;
+  views::UnhandledKeyboardEventHandler unhandled_keyboard_event_handler_;
+
+  DISALLOW_COPY_AND_ASSIGN(WebActivityController);
+};
+
+// A web view for athena's web activity.
+class AthenaWebView : public views::WebView {
+ public:
+  AthenaWebView(content::BrowserContext* context)
+      : views::WebView(context), controller_(new WebActivityController(this)) {}
+  virtual ~AthenaWebView() {}
+
+  void InstallAccelerators() { controller_->InstallAccelerators(); }
+
+ private:
+  // WebContentsDelegate:
+  virtual bool PreHandleKeyboardEvent(
+      content::WebContents* source,
+      const content::NativeWebKeyboardEvent& event,
+      bool* is_keyboard_shortcut) OVERRIDE {
+    return controller_->PreHandleKeyboardEvent(
+        source, event, is_keyboard_shortcut);
+  }
+
+  virtual void HandleKeyboardEvent(
+      content::WebContents* source,
+      const content::NativeWebKeyboardEvent& event) OVERRIDE {
+    controller_->HandleKeyboardEvent(source, event);
+  }
+
+  scoped_ptr<WebActivityController> controller_;
+
+  DISALLOW_COPY_AND_ASSIGN(AthenaWebView);
+};
+
+}  // namespace
 
 WebActivity::WebActivity(content::BrowserContext* browser_context,
                          const GURL& url)
     : browser_context_(browser_context), url_(url), web_view_(NULL) {
 }
 
 WebActivity::~WebActivity() {
 }
 
 ActivityViewModel* WebActivity::GetActivityViewModel() {
   return this;
 }
 
+void WebActivity::Init() {
+  DCHECK(web_view_);
+  static_cast<AthenaWebView*>(web_view_)->InstallAccelerators();
+}
+
 SkColor WebActivity::GetRepresentativeColor() {
   // TODO(sad): Compute the color from the favicon.
   return SK_ColorGRAY;
 }
 
 base::string16 WebActivity::GetTitle() {
   return web_view_->GetWebContents()->GetTitle();
 }
 
 views::View* WebActivity::GetContentsView() {
   if (!web_view_) {
-    web_view_ = new views::WebView(browser_context_);
+    web_view_ = new AthenaWebView(browser_context_);
     web_view_->LoadInitialURL(url_);
     Observe(web_view_->GetWebContents());
   }
   return web_view_;
 }
 
 void WebActivity::TitleWasSet(content::NavigationEntry* entry,
                               bool explicit_set) {
   ActivityManager::Get()->UpdateActivity(this);
 }
 
 void WebActivity::DidUpdateFaviconURL(
     const std::vector<content::FaviconURL>& candidates) {
   ActivityManager::Get()->UpdateActivity(this);
 }
 
 }  // namespace athena