MacViews: Implement basic NSEvent -> ui::Event conversion for Mac

ui/events/cocoa/events_mac.mm

-// Copyright (c) 2013 The Chromium Authors. All rights reserved.
+// 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 "ui/events/event_utils.h"
+
+#include <Cocoa/Cocoa.h>
+
 #include "base/logging.h"
 #include "base/time/time.h"
 #include "build/build_config.h"
+#include "ui/events/cocoa/cocoa_event_utils.h"
 #include "ui/events/event_utils.h"
+#import "ui/events/keycodes/keyboard_code_conversion_mac.h"
 #include "ui/gfx/point.h"
 #include "ui/gfx/vector2d.h"
 
 namespace ui {
 
-// Stub implementations of platform-specific methods in events_util.h, built
-// on platform sthat currently do not have a complete implementation of events.
-
 void UpdateDeviceList() {
   NOTIMPLEMENTED();
 }
 
 EventType EventTypeFromNative(const base::NativeEvent& native_event) {
-  NOTIMPLEMENTED();
+  NSEventType type = [native_event type];
+  switch (type) {
+    case NSKeyDown:
+      return ET_KEY_PRESSED;
+    case NSKeyUp:
+      return ET_KEY_RELEASED;
+    case NSLeftMouseDown:
+    case NSRightMouseDown:
+    case NSOtherMouseDown:
+      return ET_MOUSE_PRESSED;
+    case NSLeftMouseUp:
+    case NSRightMouseUp:
+    case NSOtherMouseUp:
+      return ET_MOUSE_RELEASED;
+    case NSLeftMouseDragged:
+    case NSRightMouseDragged:
+    case NSOtherMouseDragged:
+      return ET_MOUSE_DRAGGED;
+    case NSMouseMoved:
+    case NSScrollWheel:
+      return ET_MOUSEWHEEL;
+    case NSMouseEntered:
+      return ET_MOUSE_ENTERED;
+    case NSMouseExited:
+      return ET_MOUSE_EXITED;
+    case NSEventTypeSwipe:
+      return ET_SCROLL_FLING_START;
+    case NSFlagsChanged:
+    case NSAppKitDefined:
+    case NSSystemDefined:
+    case NSApplicationDefined:
+    case NSPeriodic:
+    case NSCursorUpdate:
+    case NSTabletPoint:
+    case NSTabletProximity:
+    case NSEventTypeGesture:
+    case NSEventTypeMagnify:
+    case NSEventTypeRotate:
+    case NSEventTypeBeginGesture:
+    case NSEventTypeEndGesture:
+      NOTIMPLEMENTED() << type;
+      break;
+    default:
+      NOTIMPLEMENTED() << type;
+      break;
+  }
   return ET_UNKNOWN;
 }
 
-#if !defined(OS_MACOSX)
-int EventFlagsFromNative(const base::NativeEvent& native_event) {
-  NOTIMPLEMENTED();
-  return 0;
+int EventFlagsFromNative(const base::NativeEvent& event) {
+  NSUInteger modifiers = [event modifierFlags];
+  return EventFlagsFromNSEventWithModifiers(event, modifiers);
 }
-#endif
 
 base::TimeDelta EventTimeFromNative(const base::NativeEvent& native_event) {
-  NOTIMPLEMENTED();
-  return base::TimeDelta();
+  NSTimeInterval since_system_startup = [native_event timestamp];
+  // Truncate to extract seconds before doing floating point arithmetic.
+  int64_t seconds = since_system_startup;
+  since_system_startup -= seconds;
+  int64_t microseconds = since_system_startup * 1000000;
+  return base::TimeDelta::FromSeconds(seconds) +
+      base::TimeDelta::FromMicroseconds(microseconds);
 }
 
 gfx::Point EventLocationFromNative(const base::NativeEvent& native_event) {
-  NOTIMPLEMENTED();
-  return gfx::Point();
+  if (![native_event window]) {
+    NOTIMPLEMENTED();  // Point will be in screen coordinates.
+    return gfx::Point();
+  }
+  NSPoint location = [native_event locationInWindow];
+  return gfx::Point(location.x,
+                    NSHeight([[native_event window] frame]) - location.y);
 }
 
 gfx::Point EventSystemLocationFromNative(
     const base::NativeEvent& native_event) {
   NOTIMPLEMENTED();
   return gfx::Point();
 }
 
 int EventButtonFromNative(const base::NativeEvent& native_event) {
   NOTIMPLEMENTED();
   return 0;
 }
 
 int GetChangedMouseButtonFlagsFromNative(
     const base::NativeEvent& native_event) {
-  NOTIMPLEMENTED();
+  NSEventType type = [native_event type];
+  switch (type) {
+    case NSLeftMouseDown:
+    case NSLeftMouseUp:
+    case NSLeftMouseDragged:
+      return EF_LEFT_MOUSE_BUTTON;
+    case NSRightMouseDown:
+    case NSRightMouseUp:
+    case NSRightMouseDragged:
+      return EF_RIGHT_MOUSE_BUTTON;
+    case NSOtherMouseDown:
+    case NSOtherMouseUp:
+    case NSOtherMouseDragged:
+      return EF_MIDDLE_MOUSE_BUTTON;
+  }
   return 0;
 }
 
-gfx::Vector2d GetMouseWheelOffset(const base::NativeEvent& native_event) {
-  NOTIMPLEMENTED();
-  return gfx::Vector2d();
+gfx::Vector2d GetMouseWheelOffset(const base::NativeEvent& event) {
+  // Empirically, a value of 0.1 is typical for one mousewheel click. Positive
+  // values when scrolling up or to the left. Scrolling quickly results in a
+  // higher delta per click, up to about 15.0. (Quartz documentation suggests
+  // +/-10).
+  // Multiply by 1000 to vaguely approximate WHEEL_DELTA on Windows (120).
+  const CGFloat kWheelDeltaMultiplier = 1000;
+  return gfx::Vector2d(kWheelDeltaMultiplier * [event deltaX],
+                       kWheelDeltaMultiplier * [event deltaY]);
+}
+
+base::NativeEvent CopyNativeEvent(const base::NativeEvent& event) {
+  return [event copy];
+}
+
+void ReleaseCopiedNativeEvent(const base::NativeEvent& event) {
+  [event release];
 }
 
 void ClearTouchIdIfReleased(const base::NativeEvent& native_event) {
   NOTIMPLEMENTED();
 }
 
 int GetTouchId(const base::NativeEvent& native_event) {
   NOTIMPLEMENTED();
   return 0;
 }
@@ skipping 53 matching lines @@
   NOTIMPLEMENTED();
   return false;
 }
 
 bool IsTouchpadEvent(const base::NativeEvent& native_event) {
   NOTIMPLEMENTED();
   return false;
 }
 
 KeyboardCode KeyboardCodeFromNative(const base::NativeEvent& native_event) {
-  NOTIMPLEMENTED();
-  return static_cast<KeyboardCode>(0);
+  return KeyboardCodeFromNSEvent(native_event);
 }
 
 const char* CodeFromNative(const base::NativeEvent& native_event) {
-  NOTIMPLEMENTED();
-  return "";
+  return CodeFromNSEvent(native_event);
 }
 
 }  // namespace ui