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..c7d8698e90317785b184417359948c9ee9655008
--- /dev/null
+++ b/content/browser/vibration/vibration_message_filter.cc
@@ -0,0 +1,56 @@
+// 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 kMaximumVibrationDurationMs = 10000;

[bulach, 2013/06/20 14:21:04]

nit: int

[Michael van Ouwerkerk, 2013/06/20 17:34:09]

Why int? Did you mean 'unsigned int'? The vibration duration is an 'unsigned'
from Blink up to Java.

[bulach, 2013/06/20 18:11:47]

sorry, I should've been clearer: "unsigned int" rather than just "unsigned".. 

[Michael van Ouwerkerk, 2013/06/21 09:53:38]

Done in the whole patch.

+
+VibrationMessageFilter::VibrationMessageFilter(
+    VibrationService* vibration_service) {
+  // TODO(mvanouwerkerk): Consider instantiating this lazily - crbug.com/250810
+  vibration_service_.reset(vibration_service);
+}
+
+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 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