DevTools: Protocol handler generator for content

content/browser/devtools/protocol/input_handler.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 "content/browser/devtools/protocol/input_handler.h"
+
+#include "base/strings/stringprintf.h"
+#include "content/browser/renderer_host/render_view_host_impl.h"
+#include "third_party/WebKit/public/web/WebInputEvent.h"
+
+namespace content {
+namespace devtools {
+namespace input {
+
+typedef DevToolsProtocolClient::Response Response;
+
+InputHandler::InputHandler()
+  : host_(NULL) {
+}
+
+InputHandler::~InputHandler() {
+}
+
+void InputHandler::SetRenderViewHost(RenderViewHostImpl* host) {
+  host_ = host;
+}
+
+Response InputHandler::EmulateTouchFromMouseEvent(const std::string& type,
+                                                  int x,
+                                                  int y,
+                                                  double timestamp,
+                                                  const std::string& button,
+                                                  double* delta_x,
+                                                  double* delta_y,
+                                                  int* modifiers,
+                                                  int* click_count) {
+  blink::WebMouseWheelEvent wheel_event;
+  blink::WebMouseEvent mouse_event;
+  blink::WebMouseEvent* event = &mouse_event;
+
+  if (type == emulate_touch_from_mouse_event::kTypeMousePressed) {
+    event->type = blink::WebInputEvent::MouseDown;
+  } else if (type == emulate_touch_from_mouse_event::kTypeMouseReleased) {
+    event->type = blink::WebInputEvent::MouseUp;
+  } else if (type == emulate_touch_from_mouse_event::kTypeMouseMoved) {
+    event->type = blink::WebInputEvent::MouseMove;
+  } else if (type == emulate_touch_from_mouse_event::kTypeMouseWheel) {
+    if (!delta_x || !delta_y) {
+      return Response::InvalidParams(
+          "'deltaX' and 'deltaY' are expected for mouseWheel event");
+    }
+    wheel_event.deltaX = static_cast<float>(*delta_x);
+    wheel_event.deltaY = static_cast<float>(*delta_y);
+    event = &wheel_event;
+    event->type = blink::WebInputEvent::MouseWheel;
+  } else {
+    return Response::InvalidParams(
+        base::StringPrintf("Unexpected event type '%s'", type.c_str()));
+  }
+
+  if (modifiers) {
+    if (*modifiers & 1)
+      event->modifiers |= blink::WebInputEvent::AltKey;
+    if (*modifiers & 2)
+      event->modifiers |= blink::WebInputEvent::ControlKey;
+    if (*modifiers & 4)
+      event->modifiers |= blink::WebInputEvent::MetaKey;
+    if (*modifiers & 8)
+      event->modifiers |= blink::WebInputEvent::ShiftKey;
+  }
+
+  event->timeStampSeconds = timestamp;
+  event->x = x;
+  event->y = y;
+  event->windowX = x;
+  event->windowY = y;
+  event->globalX = x;
+  event->globalY = y;
+
+  if (click_count)
+    event->clickCount = *click_count;
+
+  if (button == emulate_touch_from_mouse_event::kButtonNone) {
+    event->button = blink::WebMouseEvent::ButtonNone;
+  } else if (button == emulate_touch_from_mouse_event::kButtonLeft) {
+    event->button = blink::WebMouseEvent::ButtonLeft;
+    event->modifiers |= blink::WebInputEvent::LeftButtonDown;
+  } else if (button == emulate_touch_from_mouse_event::kButtonMiddle) {
+    event->button = blink::WebMouseEvent::ButtonMiddle;
+    event->modifiers |= blink::WebInputEvent::MiddleButtonDown;
+  } else if (button == emulate_touch_from_mouse_event::kButtonRight) {
+    event->button = blink::WebMouseEvent::ButtonRight;
+    event->modifiers |= blink::WebInputEvent::RightButtonDown;
+  } else {
+    return Response::InvalidParams(
+        base::StringPrintf("Unexpected mouse button '%s'", button.c_str()));
+  }
+
+  if (!host_)
+    return Response::ServerError("Could not connect to view");
+
+  if (event->type == blink::WebInputEvent::MouseWheel)
+    host_->ForwardWheelEvent(wheel_event);
+  else
+    host_->ForwardMouseEvent(mouse_event);
+  return Response::OK();
+}
+
+}  // namespace input
+}  // namespace devtools
+}  // namespace content