devtools: Adds Page.getLayoutMetrics.

third_party/WebKit/Source/core/inspector/InspectorPageAgent.cpp

 /*
  * Copyright (C) 2011 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 26 matching lines @@
 #include "core/dom/DOMImplementation.h"
 #include "core/dom/Document.h"
 #include "core/fetch/CSSStyleSheetResource.h"
 #include "core/fetch/FontResource.h"
 #include "core/fetch/ImageResource.h"
 #include "core/fetch/MemoryCache.h"
 #include "core/fetch/Resource.h"
 #include "core/fetch/ResourceFetcher.h"
 #include "core/fetch/ScriptResource.h"
 #include "core/frame/FrameHost.h"
+#include "core/frame/FrameView.h"
 #include "core/frame/LocalFrame.h"
 #include "core/frame/Settings.h"
+#include "core/frame/VisualViewport.h"
 #include "core/html/HTMLFrameOwnerElement.h"
 #include "core/html/VoidCallback.h"
 #include "core/html/imports/HTMLImportLoader.h"
 #include "core/html/imports/HTMLImportsController.h"
 #include "core/html/parser/TextResourceDecoder.h"
 #include "core/inspector/DOMPatchSupport.h"
 #include "core/inspector/IdentifiersFactory.h"
 #include "core/inspector/InspectedFrames.h"
 #include "core/inspector/InspectorCSSAgent.h"
 #include "core/inspector/InspectorInstrumentation.h"
@@ skipping 792 matching lines @@
 
 void InspectorPageAgent::setBlockedEventsWarningThreshold(ErrorString*,
                                                           double threshold) {
   m_state->setDouble(PageAgentState::blockedEventsWarningThreshold, threshold);
   FrameHost* host = m_inspectedFrames->root()->host();
   if (!host)
     return;
   host->settings().setBlockedMainThreadEventsWarningThreshold(threshold);
 }
 
+void InspectorPageAgent::getLayoutMetrics(
+    ErrorString*,
+    std::unique_ptr<protocol::Page::LayoutViewport>* outLayoutViewport,
+    std::unique_ptr<protocol::Page::VisualViewport>* outVisualViewport) {
+  LocalFrame* mainFrame = m_inspectedFrames->root();
+  VisualViewport& visualViewport = mainFrame->host()->visualViewport();
+
+  mainFrame->document()->updateStyleAndLayoutIgnorePendingStylesheets();
+
+  IntRect visibleContents = mainFrame->view()->visibleContentRect();
+  *outLayoutViewport = protocol::Page::LayoutViewport::create()
+                           .setPageX(visibleContents.x())
+                           .setPageY(visibleContents.y())
+                           .setClientWidth(visibleContents.width())
+                           .setClientHeight(visibleContents.height())
+                           .build();
+
+  FrameView* frameView = mainFrame->view();
+  ScrollOffset pageOffset = frameView->getScrollableArea()->scrollOffset();
+  float pageZoom = mainFrame->pageZoomFactor();
+  FloatRect visibleRect = visualViewport.visibleRect();
+  float scale = visualViewport.scale();
+  float scrollbarWidth = frameView->verticalScrollbarWidth() / scale;
+  float scrollbarHeight = frameView->horizontalScrollbarHeight() / scale;
+
+  *outVisualViewport =
+      protocol::Page::VisualViewport::create()
+          .setOffsetX(adjustScrollForAbsoluteZoom(visibleRect.x(), pageZoom))
+          .setOffsetY(adjustScrollForAbsoluteZoom(visibleRect.y(), pageZoom))
+          .setPageX(adjustScrollForAbsoluteZoom(pageOffset.width(), pageZoom))
+          .setPageY(adjustScrollForAbsoluteZoom(pageOffset.height(), pageZoom))
+          .setClientWidth(visibleRect.width() - scrollbarWidth)
+          .setClientHeight(visibleRect.height() - scrollbarHeight)
+          .setScale(scale)
+          .build();
+}
+
 DEFINE_TRACE(InspectorPageAgent) {
   visitor->trace(m_inspectedFrames);
   visitor->trace(m_inspectorResourceContentLoader);
   InspectorBaseAgent::trace(visitor);
 }
 
 }  // namespace blink