Support multi-button press for synthetic mouse events

content/browser/renderer_host/input/synthetic_mouse_driver.cc

 // Copyright 2015 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/renderer_host/input/synthetic_mouse_driver.h"
 
 #include "content/browser/renderer_host/input/synthetic_gesture_target.h"
 
 namespace content {
 
-SyntheticMouseDriver::SyntheticMouseDriver() {}
+namespace {
+
+unsigned GetWebMouseEventModifier(int button) {
+  switch (button) {
+    case 0:
+      return blink::WebMouseEvent::LeftButtonDown;
+    case 1:
+      return blink::WebMouseEvent::MiddleButtonDown;
+    case 2:
+      return blink::WebMouseEvent::RightButtonDown;
+  }
+  NOTREACHED();
+  return blink::WebMouseEvent::NoModifiers;
+}
+
+blink::WebMouseEvent::Button GetWebMouseEventButton(int button) {
+  switch (button) {
+    case 0:
+      return blink::WebMouseEvent::Button::Left;
+    case 1:
+      return blink::WebMouseEvent::Button::Middle;
+    case 2:
+      return blink::WebMouseEvent::Button::Right;
+  }
+  NOTREACHED();
+  return blink::WebMouseEvent::Button::NoButton;
+}
+}
+
+SyntheticMouseDriver::SyntheticMouseDriver() : last_modifiers_(0) {}
 
 SyntheticMouseDriver::~SyntheticMouseDriver() {}
 
 void SyntheticMouseDriver::DispatchEvent(SyntheticGestureTarget* target,
                                          const base::TimeTicks& timestamp) {
   mouse_event_.setTimeStampSeconds(ConvertTimestampToSeconds(timestamp));
   target->DispatchInputEventToPlatform(mouse_event_);
 }
 
-void SyntheticMouseDriver::Press(float x, float y, int index) {
+void SyntheticMouseDriver::Press(float x, float y, int index, int button) {
   DCHECK_EQ(index, 0);
+  int modifiers = GetWebMouseEventModifier(button);
   mouse_event_ = SyntheticWebMouseEventBuilder::Build(
-      blink::WebInputEvent::MouseDown, x, y, 0);
+      blink::WebInputEvent::MouseDown, x, y, modifiers | last_modifiers_);
   mouse_event_.clickCount = 1;
+  mouse_event_.button = GetWebMouseEventButton(button);
+  last_modifiers_ = modifiers | last_modifiers_;
 }
 
 void SyntheticMouseDriver::Move(float x, float y, int index) {
   DCHECK_EQ(index, 0);
   blink::WebMouseEvent::Button button = mouse_event_.button;
   int click_count = mouse_event_.clickCount;
   mouse_event_ = SyntheticWebMouseEventBuilder::Build(
-      blink::WebInputEvent::MouseMove, x, y, 0);
+      blink::WebInputEvent::MouseMove, x, y, last_modifiers_);
   mouse_event_.button = button;
   mouse_event_.clickCount = click_count;
 }
 
-void SyntheticMouseDriver::Release(int index) {
+void SyntheticMouseDriver::Release(int index, int button) {
   DCHECK_EQ(index, 0);
   mouse_event_ = SyntheticWebMouseEventBuilder::Build(
-      blink::WebInputEvent::MouseUp, mouse_event_.x, mouse_event_.y, 0);
+      blink::WebInputEvent::MouseUp, mouse_event_.x, mouse_event_.y,
+      last_modifiers_);
   mouse_event_.clickCount = 1;
+  mouse_event_.button = GetWebMouseEventButton(button);
+  last_modifiers_ = last_modifiers_ & (~GetWebMouseEventModifier(button));
 }
 
 bool SyntheticMouseDriver::UserInputCheck(
     const SyntheticPointerActionParams& params) const {
   if (params.index() != 0)
     return false;
 
   if (params.pointer_action_type() ==
       SyntheticPointerActionParams::PointerActionType::NOT_INITIALIZED) {
     return false;
   }
 
   if (params.pointer_action_type() ==
-          SyntheticPointerActionParams::PointerActionType::PRESS &&
-      mouse_event_.clickCount > 0) {
-    return false;
+      SyntheticPointerActionParams::PointerActionType::PRESS) {
+    int modifiers = GetWebMouseEventModifier(params.button());
+    if (last_modifiers_ & modifiers)
+      return false;
   }
 
   if (params.pointer_action_type() ==
           SyntheticPointerActionParams::PointerActionType::RELEASE &&
       mouse_event_.clickCount <= 0) {
     return false;
   }
 
   return true;
 }
 
 }  // namespace content