Add an option to run Chrome in the views desktop.

chrome/browser/renderer_host/render_widget_host_view_views_touch.cc

+// Copyright (c) 2011 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 "chrome/browser/renderer_host/render_widget_host_view_views.h"
+
+#include "base/logging.h"
+#include "content/browser/renderer_host/render_widget_host.h"
+#include "third_party/WebKit/Source/WebKit/chromium/public/gtk/WebInputEventFactory.h"
+
+static const char kRenderWidgetHostViewKey[] = "__RENDER_WIDGET_HOST_VIEW__";
+
+using WebKit::WebInputEventFactory;
+using WebKit::WebTouchEvent;
+
+namespace {
+
+WebKit::WebTouchPoint::State TouchPointStateFromEvent(
+    const views::TouchEvent* event) {
+  switch (event->type()) {
+    case ui::ET_TOUCH_PRESSED:
+      return WebKit::WebTouchPoint::StatePressed;
+    case ui::ET_TOUCH_RELEASED:
+      return WebKit::WebTouchPoint::StateReleased;
+    case ui::ET_TOUCH_MOVED:
+      return WebKit::WebTouchPoint::StateMoved;
+    case ui::ET_TOUCH_CANCELLED:
+      return WebKit::WebTouchPoint::StateCancelled;
+    default:
+      return WebKit::WebTouchPoint::StateUndefined;
+  }
+}
+
+WebKit::WebInputEvent::Type TouchEventTypeFromEvent(
+    const views::TouchEvent* event) {
+  switch (event->type()) {
+    case ui::ET_TOUCH_PRESSED:
+      return WebKit::WebInputEvent::TouchStart;
+    case ui::ET_TOUCH_RELEASED:
+      return WebKit::WebInputEvent::TouchEnd;
+    case ui::ET_TOUCH_MOVED:
+      return WebKit::WebInputEvent::TouchMove;
+    case ui::ET_TOUCH_CANCELLED:
+      return WebKit::WebInputEvent::TouchCancel;
+    default:
+      return WebKit::WebInputEvent::Undefined;
+  }
+}
+
+inline void UpdateTouchParams(const views::TouchEvent& event,
+                              WebKit::WebTouchPoint* tpoint) {
+  tpoint->radiusX = event.radius_x();
+  tpoint->radiusY = event.radius_y();
+  tpoint->rotationAngle = event.rotation_angle();
+  tpoint->force = event.force();
+}
+
+void UpdateTouchPointPosition(const views::TouchEvent* event,
+                              const gfx::Point& origin,
+                              WebKit::WebTouchPoint* tpoint) {
+  tpoint->position.x = event->x();
+  tpoint->position.y = event->y();
+
+  tpoint->screenPosition.x = tpoint->position.x + origin.x();
+  tpoint->screenPosition.y = tpoint->position.y + origin.y();
+}
+
+}  // namespace
+
+// static
+RenderWidgetHostView* RenderWidgetHostView::CreateViewForWidget(
+    RenderWidgetHost* widget) {
+  return new RenderWidgetHostViewViews(widget);
+}
+
+ui::TouchStatus RenderWidgetHostViewViews::OnTouchEvent(
+    const views::TouchEvent& event) {
+  if (!host_)
+    return ui::TOUCH_STATUS_UNKNOWN;
+
+  // Update the list of touch points first.
+  WebKit::WebTouchPoint* point = NULL;
+  ui::TouchStatus status = ui::TOUCH_STATUS_UNKNOWN;
+
+  switch (event.type()) {
+    case ui::ET_TOUCH_PRESSED:
+      // Add a new touch point.
+      if (touch_event_.touchPointsLength <
+          WebTouchEvent::touchPointsLengthCap) {
+        point = &touch_event_.touchPoints[touch_event_.touchPointsLength++];
+        point->id = event.identity();
+
+        if (touch_event_.touchPointsLength == 1) {
+          // A new touch sequence has started.
+          status = ui::TOUCH_STATUS_START;
+
+          // We also want the focus.
+          RequestFocus();
+
+          // Confirm existing composition text on touch press events, to make
+          // sure the input caret won't be moved with an ongoing composition
+          // text.
+          FinishImeCompositionSession();
+        }
+      }
+      break;
+    case ui::ET_TOUCH_RELEASED:
+    case ui::ET_TOUCH_CANCELLED:
+    case ui::ET_TOUCH_MOVED: {
+      // The touch point should have been added to the event from an earlier
+      // _PRESSED event. So find that.
+      // At the moment, only a maximum of 4 touch-points are allowed. So a
+      // simple loop should be sufficient.
+      for (int i = 0; i < touch_event_.touchPointsLength; ++i) {
+        point = touch_event_.touchPoints + i;
+        if (point->id == event.identity()) {
+          break;
+        }
+        point = NULL;
+      }
+      break;
+    }
+    default:
+      DLOG(WARNING) << "Unknown touch event " << event.type();
+      break;
+  }
+
+  if (!point)
+    return ui::TOUCH_STATUS_UNKNOWN;
+
+  if (status != ui::TOUCH_STATUS_START)
+    status = ui::TOUCH_STATUS_CONTINUE;
+
+  UpdateTouchParams(event, point);
+
+  // Update the location and state of the point.
+  point->state = TouchPointStateFromEvent(&event);
+  if (point->state == WebKit::WebTouchPoint::StateMoved) {
+    // It is possible for badly written touch drivers to emit Move events even
+    // when the touch location hasn't changed. In such cases, consume the event
+    // and pretend nothing happened.
+    if (point->position.x == event.x() && point->position.y == event.y()) {
+      return status;
+    }
+  }
+  UpdateTouchPointPosition(&event, GetMirroredPosition(), point);
+
+  // Mark the rest of the points as stationary.
+  for (int i = 0; i < touch_event_.touchPointsLength; ++i) {
+    WebKit::WebTouchPoint* iter = touch_event_.touchPoints + i;
+    if (iter != point) {
+      iter->state = WebKit::WebTouchPoint::StateStationary;
+    }
+  }
+
+  // Update the type of the touch event.
+  touch_event_.type = TouchEventTypeFromEvent(&event);
+  touch_event_.timeStampSeconds = base::Time::Now().ToDoubleT();
+
+  // The event and all the touches have been updated. Dispatch.
+  host_->ForwardTouchEvent(touch_event_);
+
+  // If the touch was released, then remove it from the list of touch points.
+  if (event.type() == ui::ET_TOUCH_RELEASED) {
+    --touch_event_.touchPointsLength;
+    for (int i = point - touch_event_.touchPoints;
+         i < touch_event_.touchPointsLength;
+         ++i) {
+      touch_event_.touchPoints[i] = touch_event_.touchPoints[i + 1];
+    }
+    if (touch_event_.touchPointsLength == 0)
+      status = ui::TOUCH_STATUS_END;
+  } else if (event.type() == ui::ET_TOUCH_CANCELLED) {
+    status = ui::TOUCH_STATUS_CANCEL;
+  }
+
+  return status;
+}
+
+// static
+RenderWidgetHostView*
+    RenderWidgetHostView::GetRenderWidgetHostViewFromNativeView(
+        gfx::NativeView widget) {
+  // TODO(beng): Figure out what to do here for Windows/v.o.v.
+  gpointer user_data = g_object_get_data(G_OBJECT(widget),
+                                         kRenderWidgetHostViewKey);
+  return reinterpret_cast<RenderWidgetHostView*>(user_data);
+}
+