Vibration API: plumbing from Blink to Java.

content/browser/vibration/vibration_message_filter.cc

Index: content/browser/vibration/vibration_message_filter.cc
diff --git a/content/browser/vibration/vibration_message_filter.cc b/content/browser/vibration/vibration_message_filter.cc
new file mode 100644
index 0000000000000000000000000000000000000000..7b327a0b4a1126ae8d5c78101df62f4e17f835c5
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+++ b/content/browser/vibration/vibration_message_filter.cc
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+// 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 int32 kMaximumVibrationDurationMs = 10000;
+
+VibrationMessageFilter::VibrationMessageFilter() {
+}
+
+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(int32 milliseconds) {
+  if (!vibration_service_.get()) {
+    vibration_service_.reset(VibrationService::Create().release());
+  }
+  if (vibration_service_.get()) {
+    // Though the Blink implementation already sanitizes vibration times, don't
+    // trust any values passed from the renderer.
+    milliseconds =
+        std::max(1, std::min(milliseconds, kMaximumVibrationDurationMs));
+    vibration_service_->Vibrate(milliseconds);
+  }
+}
+
+void VibrationMessageFilter::OnCancelVibration() {
+  if (!vibration_service_.get()) {
+    vibration_service_.reset(VibrationService::Create().release());
+  }
+  if (vibration_service_.get())
+    vibration_service_->CancelVibration();
+}
+
+}  // namespace content