components/plugins/renderer/webview_plugin.cc

   1 // Copyright 2013 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "components/plugins/renderer/webview_plugin.h"
   6
   7 #include "base/message_loop/message_loop.h"
   8 #include "base/metrics/histogram_macros.h"
   9 #include "base/numerics/safe_conversions.h"
  10 #include "content/public/common/web_preferences.h"
  11 #include "content/public/renderer/render_view.h"
  12 #include "gin/converter.h"
  13 #include "skia/ext/platform_canvas.h"
  14 #include "third_party/WebKit/public/platform/WebSize.h"
  15 #include "third_party/WebKit/public/platform/WebURL.h"
  16 #include "third_party/WebKit/public/platform/WebURLRequest.h"
  17 #include "third_party/WebKit/public/platform/WebURLResponse.h"
  18 #include "third_party/WebKit/public/web/WebDocument.h"
  19 #include "third_party/WebKit/public/web/WebElement.h"
  20 #include "third_party/WebKit/public/web/WebInputEvent.h"
  21 #include "third_party/WebKit/public/web/WebLocalFrame.h"
  22 #include "third_party/WebKit/public/web/WebPluginContainer.h"
  23 #include "third_party/WebKit/public/web/WebView.h"
  24
  25 using blink::WebCanvas;
  26 using blink::WebCursorInfo;
  27 using blink::WebDragData;
  28 using blink::WebDragOperationsMask;
  29 using blink::WebImage;
  30 using blink::WebInputEvent;
  31 using blink::WebLocalFrame;
  32 using blink::WebMouseEvent;
  33 using blink::WebPlugin;
  34 using blink::WebPluginContainer;
  35 using blink::WebPoint;
  36 using blink::WebRect;
  37 using blink::WebSize;
  38 using blink::WebString;
  39 using blink::WebURLError;
  40 using blink::WebURLRequest;
  41 using blink::WebURLResponse;
  42 using blink::WebVector;
  43 using blink::WebView;
  44 using content::WebPreferences;
  45
  46 WebViewPlugin::WebViewPlugin(WebViewPlugin::Delegate* delegate,
  47                              const WebPreferences& preferences)
  48     : delegate_(delegate),
  49       container_(NULL),
  50       web_view_(WebView::create(this)),
  51       finished_loading_(false),
  52       focused_(false) {
  53   // ApplyWebPreferences before making a WebLocalFrame so that the frame sees a
  54   // consistent view of our preferences.
  55   content::RenderView::ApplyWebPreferences(preferences, web_view_);
  56   web_frame_ = WebLocalFrame::create(blink::WebTreeScopeType::Document, this);
  57   web_view_->setMainFrame(web_frame_);
  58 }
  59
  60 // static
  61 WebViewPlugin* WebViewPlugin::Create(WebViewPlugin::Delegate* delegate,
  62                                      const WebPreferences& preferences,
  63                                      const std::string& html_data,
  64                                      const GURL& url) {
  65   DCHECK(url.is_valid()) << "Blink requires the WebView to have a valid URL.";
  66   WebViewPlugin* plugin = new WebViewPlugin(delegate, preferences);
  67   plugin->web_view()->mainFrame()->loadHTMLString(html_data, url);
  68   return plugin;
  69 }
  70
  71 WebViewPlugin::~WebViewPlugin() {
  72   web_view_->close();
  73   web_frame_->close();
  74 }
  75
  76 void WebViewPlugin::ReplayReceivedData(WebPlugin* plugin) {
  77   if (!response_.isNull()) {
  78     plugin->didReceiveResponse(response_);
  79     size_t total_bytes = 0;
  80     for (std::list<std::string>::iterator it = data_.begin(); it != data_.end();
  81          ++it) {
  82       plugin->didReceiveData(
  83           it->c_str(), base::checked_cast<int, size_t>(it->length()));
  84       total_bytes += it->length();
  85     }
  86     UMA_HISTOGRAM_MEMORY_KB(
  87         "PluginDocument.Memory",
  88         (base::checked_cast<int, size_t>(total_bytes / 1024)));
  89     UMA_HISTOGRAM_COUNTS(
  90         "PluginDocument.NumChunks",
  91         (base::checked_cast<int, size_t>(data_.size())));
  92   }
  93   // We need to transfer the |focused_| to new plugin after it loaded.
  94   if (focused_) {
  95     plugin->updateFocus(true, blink::WebFocusTypeNone);
  96   }
  97   if (finished_loading_) {
  98     plugin->didFinishLoading();
  99   }
 100   if (error_) {
 101     plugin->didFailLoading(*error_);
 102   }
 103 }
 104
 105 void WebViewPlugin::RestoreTitleText() {
 106   if (container_)
 107     container_->element().setAttribute("title", old_title_);
 108 }
 109
 110 WebPluginContainer* WebViewPlugin::container() const { return container_; }
 111
 112 bool WebViewPlugin::initialize(WebPluginContainer* container) {
 113   container_ = container;
 114   if (container_) {
 115     old_title_ = container_->element().getAttribute("title");
 116
 117     // Propagate device scale to inner webview to load the correct resource
 118     // when images have a "srcset" attribute.
 119     web_view_->setDeviceScaleFactor(container_->deviceScaleFactor());
 120   }
 121   return true;
 122 }
 123
 124 void WebViewPlugin::destroy() {
 125   if (delegate_) {
 126     delegate_->PluginDestroyed();
 127     delegate_ = NULL;
 128   }
 129   container_ = NULL;
 130   base::MessageLoop::current()->DeleteSoon(FROM_HERE, this);
 131 }
 132
 133 v8::Local<v8::Object> WebViewPlugin::v8ScriptableObject(v8::Isolate* isolate) {
 134   if (!delegate_)
 135     return v8::Local<v8::Object>();
 136
 137   return delegate_->GetV8ScriptableObject(isolate);
 138 }
 139
 140 void WebViewPlugin::layoutIfNeeded() {
 141   web_view_->layout();
 142 }
 143
 144 void WebViewPlugin::paint(WebCanvas* canvas, const WebRect& rect) {
 145   gfx::Rect paint_rect = gfx::IntersectRects(rect_, rect);
 146   if (paint_rect.IsEmpty())
 147     return;
 148
 149   paint_rect.Offset(-rect_.x(), -rect_.y());
 150
 151   canvas->save();
 152   canvas->translate(SkIntToScalar(rect_.x()), SkIntToScalar(rect_.y()));
 153
 154   // Apply inverse device scale factor, as the outer webview has already
 155   // applied it, and the inner webview will apply it again.
 156   SkScalar inverse_scale =
 157       SkFloatToScalar(1.0 / container_->deviceScaleFactor());
 158   canvas->scale(inverse_scale, inverse_scale);
 159
 160   web_view_->paint(canvas, paint_rect);
 161
 162   canvas->restore();
 163 }
 164
 165 // Coordinates are relative to the containing window.
 166 void WebViewPlugin::updateGeometry(const WebRect& window_rect,
 167                                    const WebRect& clip_rect,
 168                                    const WebRect& unobscured_rect,
 169                                    const WebVector<WebRect>& cut_outs_rects,
 170                                    bool is_visible) {
 171   if (static_cast<gfx::Rect>(window_rect) != rect_) {
 172     rect_ = window_rect;
 173     WebSize newSize(window_rect.width, window_rect.height);
 174     web_view_->resize(newSize);
 175   }
 176
 177   if (delegate_)
 178     delegate_->OnUnobscuredSizeUpdate(gfx::Rect(unobscured_rect).size());
 179 }
 180
 181 void WebViewPlugin::updateFocus(bool focused, blink::WebFocusType focus_type) {
 182   focused_ = focused;
 183 }
 184
 185 bool WebViewPlugin::acceptsInputEvents() { return true; }
 186
 187 bool WebViewPlugin::handleInputEvent(const WebInputEvent& event,
 188                                      WebCursorInfo& cursor) {
 189   // For tap events, don't handle them. They will be converted to
 190   // mouse events later and passed to here.
 191   if (event.type == WebInputEvent::GestureTap)
 192     return false;
 193
 194   // For LongPress events we return false, since otherwise the context menu will
 195   // be suppressed. https://crbug.com/482842
 196   if (event.type == WebInputEvent::GestureLongPress)
 197     return false;
 198
 199   if (event.type == WebInputEvent::ContextMenu) {
 200     if (delegate_) {
 201       const WebMouseEvent& mouse_event =
 202           reinterpret_cast<const WebMouseEvent&>(event);
 203       delegate_->ShowContextMenu(mouse_event);
 204     }
 205     return true;
 206   }
 207   current_cursor_ = cursor;
 208   bool handled = web_view_->handleInputEvent(event);
 209   cursor = current_cursor_;
 210
 211   return handled;
 212 }
 213
 214 void WebViewPlugin::didReceiveResponse(const WebURLResponse& response) {
 215   DCHECK(response_.isNull());
 216   response_ = response;
 217 }
 218
 219 void WebViewPlugin::didReceiveData(const char* data, int data_length) {
 220   data_.push_back(std::string(data, data_length));
 221 }
 222
 223 void WebViewPlugin::didFinishLoading() {
 224   DCHECK(!finished_loading_);
 225   finished_loading_ = true;
 226 }
 227
 228 void WebViewPlugin::didFailLoading(const WebURLError& error) {
 229   DCHECK(!error_.get());
 230   error_.reset(new WebURLError(error));
 231 }
 232
 233 bool WebViewPlugin::acceptsLoadDrops() { return false; }
 234
 235 void WebViewPlugin::setToolTipText(const WebString& text,
 236                                    blink::WebTextDirection hint) {
 237   if (container_)
 238     container_->element().setAttribute("title", text);
 239 }
 240
 241 void WebViewPlugin::startDragging(WebLocalFrame*,
 242                                   const WebDragData&,
 243                                   WebDragOperationsMask,
 244                                   const WebImage&,
 245                                   const WebPoint&) {
 246   // Immediately stop dragging.
 247   web_view_->dragSourceSystemDragEnded();
 248 }
 249
 250 bool WebViewPlugin::allowsBrokenNullLayerTreeView() const {
 251   return true;
 252 }
 253
 254 void WebViewPlugin::didInvalidateRect(const WebRect& rect) {
 255   if (container_)
 256     container_->invalidateRect(rect);
 257 }
 258
 259 void WebViewPlugin::didChangeCursor(const WebCursorInfo& cursor) {
 260   current_cursor_ = cursor;
 261 }
 262
 263 void WebViewPlugin::scheduleAnimation() {
 264   if (container_)
 265     container_->setNeedsLayout();
 266 }
 267
 268 void WebViewPlugin::didClearWindowObject(WebLocalFrame* frame) {
 269   if (!delegate_)
 270     return;
 271
 272   v8::Isolate* isolate = blink::mainThreadIsolate();
 273   v8::HandleScope handle_scope(isolate);
 274   v8::Local<v8::Context> context = frame->mainWorldScriptContext();
 275   DCHECK(!context.IsEmpty());
 276
 277   v8::Context::Scope context_scope(context);
 278   v8::Local<v8::Object> global = context->Global();
 279
 280   global->Set(gin::StringToV8(isolate, "plugin"),
 281               delegate_->GetV8Handle(isolate));
 282 }
 283
 284 void WebViewPlugin::didReceiveResponse(WebLocalFrame* frame,
 285                                        unsigned identifier,
 286                                        const WebURLResponse& response) {
 287   WebFrameClient::didReceiveResponse(frame, identifier, response);
 288 }