[DevTools] Switch from blink-based to content-based touch emulation.

Source/web/WebDevToolsAgentImpl.cpp

 /*
  * Copyright (C) 2010-2011 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 33 matching lines @@
 #include "WebSettings.h"
 #include "WebViewClient.h"
 #include "WebViewImpl.h"
 #include "bindings/v8/PageScriptDebugServer.h"
 #include "bindings/v8/ScriptController.h"
 #include "bindings/v8/V8Binding.h"
 #include "core/dom/ExceptionCode.h"
 #include "core/fetch/MemoryCache.h"
 #include "core/frame/FrameView.h"
 #include "core/frame/LocalFrame.h"
+#include "core/frame/Settings.h"
 #include "core/inspector/InjectedScriptHost.h"
 #include "core/inspector/InspectorController.h"
 #include "core/page/Page.h"
 #include "core/rendering/RenderView.h"
 #include "platform/JSONValues.h"
 #include "platform/graphics/GraphicsContext.h"
 #include "platform/network/ResourceError.h"
 #include "platform/network/ResourceRequest.h"
 #include "platform/network/ResourceResponse.h"
 #include "public/platform/Platform.h"
@@ skipping 134 matching lines @@
     WebDevToolsAgentClient* client)
     : m_hostId(client->hostIdentifier())
     , m_client(client)
     , m_webViewImpl(webViewImpl)
     , m_attached(false)
     , m_generatingEvent(false)
     , m_deviceMetricsEnabled(false)
     , m_emulateViewportEnabled(false)
     , m_originalViewportEnabled(false)
     , m_isOverlayScrollbarsEnabled(false)
+    , m_touchEventEmulationEnabled(false)
+    , m_originalTouchEnabled(false)
+    , m_originalDeviceSupportsMouse(false)
 {
     ASSERT(m_hostId > 0);
     ClientMessageLoopAdapter::ensureClientMessageLoopCreated(m_client);
 }
 
 WebDevToolsAgentImpl::~WebDevToolsAgentImpl()
 {
     ClientMessageLoopAdapter::inspectedViewClosed(m_webViewImpl);
     if (m_attached)
         blink::Platform::current()->currentThread()->removeTaskObserver(this);
@@ skipping 73 matching lines @@
 {
     if (InspectorController* ic = inspectorController())
         ic->webViewResized(IntSize());
 }
 
 bool WebDevToolsAgentImpl::handleInputEvent(WebCore::Page* page, const WebInputEvent& inputEvent)
 {
     if (!m_attached && !m_generatingEvent)
         return false;
 
+    // FIXME: This workaround is required for touch emulation on Mac, where
+    // compositor-side pinch handling is not enabled. See http://crbug.com/138003.
+    bool isPinch = inputEvent.type == WebInputEvent::GesturePinchBegin || inputEvent.type == WebInputEvent::GesturePinchUpdate || inputEvent.type == WebInputEvent::GesturePinchEnd;
+    if (isPinch && m_touchEventEmulationEnabled && m_emulateViewportEnabled) {
+        FrameView* frameView = page->mainFrame()->view();
+        PlatformGestureEventBuilder gestureEvent(frameView, *static_cast<const WebGestureEvent*>(&inputEvent));
+        float pageScaleFactor = page->pageScaleFactor();
+        if (gestureEvent.type() == PlatformEvent::GesturePinchBegin) {
+            m_lastPinchAnchorCss = adoptPtr(new WebCore::IntPoint(frameView->scrollPosition() + gestureEvent.position()));
+            m_lastPinchAnchorDip = adoptPtr(new WebCore::IntPoint(gestureEvent.position()));
+            m_lastPinchAnchorDip->scale(pageScaleFactor, pageScaleFactor);
+        }
+        if (gestureEvent.type() == PlatformEvent::GesturePinchUpdate && m_lastPinchAnchorCss) {
+            float newPageScaleFactor = pageScaleFactor * gestureEvent.scale();
+            WebCore::IntPoint anchorCss(*m_lastPinchAnchorDip.get());
+            anchorCss.scale(1.f / newPageScaleFactor, 1.f / newPageScaleFactor);
+            m_webViewImpl->setPageScaleFactor(newPageScaleFactor);
+            m_webViewImpl->setMainFrameScrollOffset(*m_lastPinchAnchorCss.get() - toIntSize(anchorCss));
+        }
+        if (gestureEvent.type() == PlatformEvent::GesturePinchEnd) {
+            m_lastPinchAnchorCss.clear();
+            m_lastPinchAnchorDip.clear();
+        }
+        return true;
+    }
+
     InspectorController* ic = inspectorController();
     if (!ic)
         return false;
 
     if (WebInputEvent::isGestureEventType(inputEvent.type) && inputEvent.type == WebInputEvent::GestureTap) {
         // Only let GestureTab in (we only need it and we know PlatformGestureEventBuilder supports it).
         PlatformGestureEvent gestureEvent = PlatformGestureEventBuilder(page->mainFrame()->view(), *static_cast<const WebGestureEvent*>(&inputEvent));
         return ic->handleGestureEvent(page->mainFrame(), gestureEvent);
     }
     if (WebInputEvent::isMouseEventType(inputEvent.type) && inputEvent.type != WebInputEvent::MouseEnter) {
@@ skipping 34 matching lines @@
         WebDeviceEmulationParams params;
         params.screenPosition = emulateViewport ? WebDeviceEmulationParams::Mobile : WebDeviceEmulationParams::Desktop;
         params.deviceScaleFactor = deviceScaleFactor;
         params.viewSize = WebSize(width, height);
         params.fitToView = fitWindow;
         params.viewInsets = WebSize(10, 10);
         m_client->enableDeviceEmulation(params);
     }
 }
 
+void WebDevToolsAgentImpl::setTouchEventEmulationEnabled(bool enabled)
+{
+    if (m_touchEventEmulationEnabled == enabled)
+        return;
+
+    if (!m_touchEventEmulationEnabled) {
+        m_originalTouchEnabled = RuntimeEnabledFeatures::touchEnabled();
+        if (m_webViewImpl->page())
+            m_originalDeviceSupportsMouse = m_webViewImpl->page()->settings().deviceSupportsMouse();
+    }
+    RuntimeEnabledFeatures::setTouchEnabled(enabled ? true : m_originalTouchEnabled);
+    if (m_webViewImpl->page())
+        m_webViewImpl->page()->settings().setDeviceSupportsMouse(enabled ? false : m_originalDeviceSupportsMouse);
+    m_client->setTouchEventEmulationEnabled(enabled, m_emulateViewportEnabled);
+    m_touchEventEmulationEnabled = enabled;
+    m_webViewImpl->mainFrameImpl()->frame()->view()->layout();
+}
+
 void WebDevToolsAgentImpl::enableViewportEmulation()
 {
     if (m_emulateViewportEnabled)
         return;
     m_emulateViewportEnabled = true;
     m_isOverlayScrollbarsEnabled = RuntimeEnabledFeatures::overlayScrollbarsEnabled();
     RuntimeEnabledFeatures::setOverlayScrollbarsEnabled(true);
     m_originalViewportEnabled = RuntimeEnabledFeatures::cssViewportEnabled();
     RuntimeEnabledFeatures::setCSSViewportEnabled(true);
     m_webViewImpl->settings()->setViewportEnabled(true);
     m_webViewImpl->settings()->setViewportMetaEnabled(true);
     m_webViewImpl->settings()->setShrinksViewportContentToFit(true);
     m_webViewImpl->setIgnoreViewportTagScaleLimits(true);
     m_webViewImpl->setPageScaleFactorLimits(-1, -1);
     m_webViewImpl->setZoomFactorOverride(1);
+    // FIXME: with touch and viewport emulation enabled, we may want to disable overscroll navigation.
+    if (m_touchEventEmulationEnabled)
+        m_client->setTouchEventEmulationEnabled(m_touchEventEmulationEnabled, m_emulateViewportEnabled);
 }
 
 void WebDevToolsAgentImpl::disableViewportEmulation()
 {
     if (!m_emulateViewportEnabled)
         return;
     RuntimeEnabledFeatures::setOverlayScrollbarsEnabled(m_isOverlayScrollbarsEnabled);
     RuntimeEnabledFeatures::setCSSViewportEnabled(m_originalViewportEnabled);
     m_webViewImpl->settings()->setViewportEnabled(false);
     m_webViewImpl->settings()->setViewportMetaEnabled(false);
     m_webViewImpl->settings()->setShrinksViewportContentToFit(false);
     m_webViewImpl->setIgnoreViewportTagScaleLimits(false);
     m_webViewImpl->setPageScaleFactorLimits(1, 1);
     m_webViewImpl->setZoomFactorOverride(0);
     m_emulateViewportEnabled = false;
+    if (m_touchEventEmulationEnabled)
+        m_client->setTouchEventEmulationEnabled(m_touchEventEmulationEnabled, m_emulateViewportEnabled);
 }
 
 void WebDevToolsAgentImpl::getAllocatedObjects(HashSet<const void*>& set)
 {
     class CountingVisitor : public WebDevToolsAgentClient::AllocatedObjectVisitor {
     public:
         CountingVisitor() : m_totalObjectsCount(0)
         {
         }
 
@@ skipping 273 matching lines @@
         || commandName == InspectorBackendDispatcher::commandName(InspectorBackendDispatcher::kProfiler_startCmd)
         || commandName == InspectorBackendDispatcher::commandName(InspectorBackendDispatcher::kProfiler_stopCmd);
 }
 
 void WebDevToolsAgent::processPendingMessages()
 {
     PageScriptDebugServer::shared().runPendingTasks();
 }
 
 } // namespace blink