Mojo: HTML Viewer based on Blink.

mojo/examples/html_viewer/html_document_view.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 "mojo/examples/html_viewer/html_document_view.h"
+
+#include "base/bind.h"
+#include "base/location.h"
+#include "base/single_thread_task_runner.h"
+#include "base/thread_task_runner_handle.h"
+#include "mojo/services/public/cpp/view_manager/node.h"
+#include "mojo/services/public/cpp/view_manager/view.h"
+#include "skia/ext/refptr.h"
+#include "third_party/WebKit/public/web/WebConsoleMessage.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/WebScriptSource.h"
+#include "third_party/WebKit/public/web/WebSettings.h"
+#include "third_party/WebKit/public/web/WebView.h"
+#include "third_party/skia/include/core/SkCanvas.h"
+#include "third_party/skia/include/core/SkColor.h"
+#include "third_party/skia/include/core/SkDevice.h"
+
+namespace mojo {
+namespace examples {
+namespace {
+
+blink::WebData CopyToWebData(DataPipeConsumerHandle handle) {
+  std::vector<char> data;
+  for (;;) {
+    char buf[4096];
+    uint32_t num_bytes = sizeof(buf);
+    MojoResult result = ReadDataRaw(
+        handle,
+        buf,
+        &num_bytes,
+        MOJO_READ_DATA_FLAG_NONE);
+    if (result == MOJO_RESULT_SHOULD_WAIT) {
+      Wait(handle,
+           MOJO_HANDLE_SIGNAL_READABLE,
+           MOJO_DEADLINE_INDEFINITE);
+    } else if (result == MOJO_RESULT_OK) {
+      data.insert(data.end(), buf, buf + num_bytes);
+    } else {
+      break;
+    }
+  }
+  return blink::WebData(data);
+}
+
+void ConfigureSettings(blink::WebSettings* settings) {
+  settings->setAcceleratedCompositingEnabled(false);

[abarth-chromium, 2014/06/20 14:44:31]

We're on a path to deleting this mode.  Can we break html_viewer if it's the
last client?  If so, can you add a comment to that effect here?

+  settings->setLoadsImagesAutomatically(true);
+  settings->setJavaScriptEnabled(true);
+}
+
+}  // namespace
+
+HTMLDocumentView::HTMLDocumentView(view_manager::ViewManager* view_manager)
+    : view_manager_(view_manager),
+      view_(view_manager::View::Create(view_manager_)),
+      web_view_(NULL),
+      repaint_pending_(false),
+      weak_factory_(this) {
+}
+
+HTMLDocumentView::~HTMLDocumentView() {
+  if (web_view_)
+    web_view_->close();
+}
+
+void HTMLDocumentView::AttachToNode(view_manager::Node* node) {
+  node->SetActiveView(view_);
+  view_->SetColor(SK_ColorCYAN);  // Dummy background color.
+
+  web_view_ = blink::WebView::create(this);
+  ConfigureSettings(web_view_->settings());
+  web_view_->setMainFrame(blink::WebLocalFrame::create(this));
+
+  // TODO(darin): Track size of view_manager::Node.
+  web_view_->resize(gfx::Size(800, 600));
+}
+
+void HTMLDocumentView::Load(URLResponsePtr response,
+                            ScopedDataPipeConsumerHandle response_body_stream) {
+  DCHECK(web_view_);
+
+  // TODO(darin): A better solution would be to use loadRequest, but intercept
+  // the network request and connect it to the response we already have.
+  blink::WebData data = CopyToWebData(response_body_stream.get());
+  web_view_->mainFrame()->loadHTMLString(
+      data, GURL(response->url), GURL(response->url));
+}
+
+void HTMLDocumentView::didInvalidateRect(const blink::WebRect& rect) {
+  if (!repaint_pending_) {
+    repaint_pending_ = true;
+    base::ThreadTaskRunnerHandle::Get()->PostTask(
+        FROM_HERE,
+        base::Bind(&HTMLDocumentView::Repaint, weak_factory_.GetWeakPtr()));
+  }
+}
+
+bool HTMLDocumentView::allowsBrokenNullLayerTreeView() const {
+  return true;  // TODO(darin): Switch to using compositor.
+}
+
+void HTMLDocumentView::didAddMessageToConsole(
+    const blink::WebConsoleMessage& message,
+    const blink::WebString& source_name,
+    unsigned source_line,
+    const blink::WebString& stack_trace) {
+  printf("### console: %s\n", std::string(message.text.utf8()).c_str());
+}
+
+void HTMLDocumentView::Repaint() {
+  repaint_pending_ = false;
+
+  web_view_->animate(0.0);
+  web_view_->layout();
+
+  int width = web_view_->size().width;
+  int height = web_view_->size().height;
+
+  skia::RefPtr<SkCanvas> canvas = skia::AdoptRef(SkCanvas::NewRaster(
+      SkImageInfo::MakeN32(width, height, kOpaque_SkAlphaType)));
+
+  web_view_->paint(canvas.get(), gfx::Rect(0, 0, width, height));
+
+  view_->SetContents(canvas->getDevice()->accessBitmap(false));
+}
+
+}  // namespace examples
+}  // namespace mojo