Pepper: Clean up ProgressEvent logic.

components/nacl/renderer/progress_event.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 "components/nacl/renderer/progress_event.h"
+
+#include "base/bind.h"
+#include "base/location.h"
+#include "base/logging.h"
+#include "base/message_loop/message_loop_proxy.h"
+#include "content/public/renderer/pepper_plugin_instance.h"
+#include "ppapi/c/private/ppb_nacl_private.h"
+#include "ppapi/shared_impl/ppapi_globals.h"
+#include "third_party/WebKit/public/platform/WebString.h"
+#include "third_party/WebKit/public/web/WebDOMResourceProgressEvent.h"
+#include "third_party/WebKit/public/web/WebDocument.h"
+#include "third_party/WebKit/public/web/WebElement.h"
+#include "third_party/WebKit/public/web/WebLocalFrame.h"
+#include "third_party/WebKit/public/web/WebPluginContainer.h"
+#include "v8/include/v8.h"
+
+namespace nacl {
+
+namespace {
+blink::WebString EventTypeToString(PP_NaClEventType event_type) {
+  switch (event_type) {
+    case PP_NACL_EVENT_LOADSTART:
+      return blink::WebString::fromUTF8("loadstart");
+    case PP_NACL_EVENT_PROGRESS:
+      return blink::WebString::fromUTF8("progress");
+    case PP_NACL_EVENT_ERROR:
+      return blink::WebString::fromUTF8("error");
+    case PP_NACL_EVENT_ABORT:
+      return blink::WebString::fromUTF8("abort");
+    case PP_NACL_EVENT_LOAD:
+      return blink::WebString::fromUTF8("load");
+    case PP_NACL_EVENT_LOADEND:
+      return blink::WebString::fromUTF8("loadend");
+    case PP_NACL_EVENT_CRASH:
+      return blink::WebString::fromUTF8("crash");
+  }
+  NOTIMPLEMENTED();
+  return blink::WebString();
+}
+
+void DispatchProgressEventOnMainThread(PP_Instance instance,
+                                       const ProgressEvent &event) {
+  content::PepperPluginInstance* plugin_instance =
+      content::PepperPluginInstance::Get(instance);
+  if (!plugin_instance)
+    return;
+
+  blink::WebPluginContainer* container = plugin_instance->GetContainer();
+  // It's possible that container() is NULL if the plugin has been removed from
+  // the DOM (but the PluginInstance is not destroyed yet).
+  if (!container)
+    return;
+  blink::WebLocalFrame* frame = container->element().document().frame();
+  if (!frame)
+    return;
+  v8::HandleScope handle_scope(plugin_instance->GetIsolate());
+  v8::Local<v8::Context> context(
+      plugin_instance->GetIsolate()->GetCurrentContext());
+  if (context.IsEmpty()) {
+    // If there's no JavaScript on the stack, we have to make a new Context.
+    context = v8::Context::New(plugin_instance->GetIsolate());
+  }
+  v8::Context::Scope context_scope(context);
+
+  if (!event.resource_url.empty()) {
+    blink::WebString url_string = blink::WebString::fromUTF8(
+        event.resource_url.data(), event.resource_url.size());
+    blink::WebDOMResourceProgressEvent blink_event(
+        EventTypeToString(event.event_type),
+        event.length_is_computable,
+        event.loaded_bytes,
+        event.total_bytes,
+        url_string);
+    container->element().dispatchEvent(blink_event);
+  } else {
+    blink::WebDOMProgressEvent blink_event(EventTypeToString(event.event_type),
+                                           event.length_is_computable,
+                                           event.loaded_bytes,
+                                           event.total_bytes);
+    container->element().dispatchEvent(blink_event);
+  }
+}
+
+}  // namespace
+
+void DispatchProgressEvent(PP_Instance instance, const ProgressEvent &event) {
+  ppapi::PpapiGlobals::Get()->GetMainThreadMessageLoop()->PostTask(
+      FROM_HERE,
+      base::Bind(&DispatchProgressEventOnMainThread, instance, event));
+}
+
+}  // namespace nacl