Vibration API: plumbing from Blink to Java.

content/browser/vibration/vibration_message_filter.cc

+// Copyright (c) 2013 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 "content/browser/vibration/vibration_message_filter.h"
+
+#include <algorithm>
+
+#include "content/common/view_messages.h"
+
+namespace content {
+
+// Maximum duration of a vibration is 10 seconds.
+const unsigned int kMaximumVibrationDurationMs = 10000;
+
+VibrationMessageFilter::VibrationMessageFilter(
+    scoped_ptr<VibrationService> vibration_service) {
+  // TODO(mvanouwerkerk): Consider instantiating this lazily - crbug.com/250810
+  vibration_service_.reset(vibration_service.release());

[bulach, 2013/06/21 12:55:54]

sorry, I just realized.. this is _always_ going to be created, and it goes up to
java, etc, for every renderer process host.. :(

since the factory function is at the same level here and takes no arguments, how
about just lazily create in this class?

[Michael van Ouwerkerk, 2013/06/21 15:07:41]

Done.

+}
+
+VibrationMessageFilter::~VibrationMessageFilter() {
+  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
+  if (vibration_service_.get())
+    vibration_service_->CancelVibration();
+}
+
+bool VibrationMessageFilter::OnMessageReceived(
+    const IPC::Message& message,
+    bool* message_was_ok) {
+  bool handled = true;
+  IPC_BEGIN_MESSAGE_MAP_EX(VibrationMessageFilter,
+                           message,
+                           *message_was_ok)
+    IPC_MESSAGE_HANDLER(ViewHostMsg_Vibrate, OnVibrate)
+    IPC_MESSAGE_HANDLER(ViewHostMsg_CancelVibration, OnCancelVibration)
+    IPC_MESSAGE_UNHANDLED(handled = false)
+  IPC_END_MESSAGE_MAP_EX()
+  return handled;
+}
+
+void VibrationMessageFilter::OnVibrate(unsigned int milliseconds) {
+  // Though the Blink implementation rejects vibration times that are too long,
+  // don't trust the values passed from the renderer.
+  if (vibration_service_.get()) {
+    vibration_service_->Vibrate(
+        std::min(milliseconds, kMaximumVibrationDurationMs));
+  }
+}
+
+void VibrationMessageFilter::OnCancelVibration() {
+  if (vibration_service_.get())
+    vibration_service_->CancelVibration();
+}
+
+}  // namespace content