events: Make it a separate component from ui.

ui/base/cocoa/events_mac.mm

-// Copyright (c) 2012 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 <Cocoa/Cocoa.h>
-
-#include "ui/events/event_constants.h"
-
-#include "base/event_types.h"
-#include "base/logging.h"
-#include "base/time/time.h"
-#include "ui/events/event_utils.h"
-#import "ui/events/keycodes/keyboard_code_conversion_mac.h"
-#include "ui/gfx/point.h"
-
-namespace ui {
-
-EventType EventTypeFromNative(const base::NativeEvent& native_event) {
-  NSEventType native_type = [native_event type];
-  switch (native_type) {
-    case NSLeftMouseDown:
-    case NSRightMouseDown:
-    case NSOtherMouseDown:
-      return ET_MOUSE_PRESSED;
-
-    case NSLeftMouseUp:
-    case NSRightMouseUp:
-    case NSOtherMouseUp:
-      return ET_MOUSE_RELEASED;
-
-    case NSMouseMoved:
-      return ET_MOUSE_MOVED;
-
-    case NSLeftMouseDragged:
-    case NSRightMouseDragged:
-    case NSOtherMouseDragged:
-      return ET_MOUSE_DRAGGED;
-
-    case NSMouseEntered:
-      return ET_MOUSE_ENTERED;
-
-    case NSMouseExited:
-      return ET_MOUSE_EXITED;
-
-    case NSKeyDown:
-      return ET_KEY_PRESSED;
-
-    case NSKeyUp:
-      return ET_KEY_RELEASED;
-
-    case NSFlagsChanged:
-      return ET_KEY_PRESSED;
-
-    case NSScrollWheel:
-      return ET_MOUSEWHEEL;
-
-    case NSAppKitDefined:
-    case NSSystemDefined:
-    case NSApplicationDefined:
-    case NSPeriodic:
-    case NSCursorUpdate:
-    case NSTabletPoint:
-    case NSTabletProximity:
-    default:
-      return ET_UNKNOWN;
-  }
-}
-
-int EventFlagsFromNative(const base::NativeEvent& native_event) {
-  int event_flags = 0;
-  NSUInteger modifiers = [native_event modifierFlags];
-
-  if (modifiers & NSAlphaShiftKeyMask)
-    event_flags = event_flags | EF_CAPS_LOCK_DOWN;
-
-  if (modifiers & NSShiftKeyMask)
-    event_flags = event_flags | EF_SHIFT_DOWN;
-
-  if (modifiers & NSControlKeyMask)
-    event_flags = event_flags | EF_CONTROL_DOWN;
-
-  if (modifiers & NSAlternateKeyMask)
-    event_flags = event_flags | EF_ALT_DOWN;
-
-  if (modifiers & NSCommandKeyMask)
-    event_flags = event_flags | EF_COMMAND_DOWN;
-
-  NSEventType type = [native_event type];
-
-  if (type == NSLeftMouseDown ||
-      type == NSLeftMouseUp ||
-      type == NSLeftMouseDragged) {
-    event_flags = event_flags | EF_LEFT_MOUSE_BUTTON;
-  }
-
-  if (type == NSRightMouseDown ||
-      type == NSRightMouseUp ||
-      type == NSRightMouseDragged) {
-    event_flags = event_flags | EF_RIGHT_MOUSE_BUTTON;
-  }
-
-  if (type == NSOtherMouseDown ||
-      type == NSOtherMouseUp ||
-      type == NSOtherMouseDragged) {
-    event_flags = event_flags | EF_MIDDLE_MOUSE_BUTTON;
-  }
-
-  return event_flags;
-}
-
-base::TimeDelta EventTimeFromNative(const base::NativeEvent& native_event) {
-  return base::TimeDelta::FromMicroseconds(
-      [native_event timestamp] * 1000000.0f);
-}
-
-gfx::Point EventLocationFromNative(const base::NativeEvent& native_event) {
-  NSWindow* window = [native_event window];
-  NSPoint location = [native_event locationInWindow];
-
-  // Convert |location| to be relative to coordinate system of |contentView|.
-  // Note: this assumes that ui::Event coordinates are rooted in the top-level
-  // view (with flipped coordinates).  A more general (but costly) approach
-  // would be to hit-test the view of the event and use the found view's
-  // coordinate system.  Currently there is no need for this generality, and
-  // speed is preferred.  Flipped views are not suppported.
-  DCHECK([[window contentView] isFlipped] == NO);
-  location = [[window contentView] convertPoint:location fromView:nil];
-  location.y = [[window contentView] bounds].size.height - location.y;
-
-  return gfx::Point(NSPointToCGPoint(location));
-}
-
-gfx::Point EventSystemLocationFromNative(
-    const base::NativeEvent& native_event) {
-  // TODO(port): Needs to always return screen position here. Returning normal
-  // origin for now since that's obviously wrong.
-  return gfx::Point(0, 0);
-}
-
-KeyboardCode KeyboardCodeFromNative(const base::NativeEvent& native_event) {
-  return ui::KeyboardCodeFromNSEvent(native_event);
-}
-
-bool IsMouseEvent(const base::NativeEvent& native_event) {
-  EventType type = EventTypeFromNative(native_event);
-  return type == ET_MOUSE_PRESSED ||
-         type == ET_MOUSE_DRAGGED ||
-         type == ET_MOUSE_RELEASED ||
-         type == ET_MOUSE_MOVED ||
-         type == ET_MOUSE_ENTERED ||
-         type == ET_MOUSE_EXITED;
-}
-
-gfx::Vector2d GetMouseWheelOffset(const base::NativeEvent& native_event) {
-  // TODO(dhollowa): Come back to this once comparisons can be made with other
-  // platforms.
-  return gfx::Vector2d([native_event deltaX], [native_event deltaY]);
-}
-
-void ClearTouchIdIfReleased(const base::NativeEvent& xev) {
-  // Touch is currently unsupported.
-}
-
-int GetTouchId(const base::NativeEvent& native_event) {
-  // Touch is currently unsupported.
-  return 0;
-}
-
-float GetTouchRadiusX(const base::NativeEvent& native_event) {
-  // Touch is currently unsupported.
-  return 1.0;
-}
-
-float GetTouchRadiusY(const base::NativeEvent& native_event) {
-  // Touch is currently unsupported.
-  return 1.0;
-}
-
-float GetTouchAngle(const base::NativeEvent& native_event) {
-  // Touch is currently unsupported.
-  return 0.0;
-}
-
-float GetTouchForce(const base::NativeEvent& native_event) {
-  // Touch is currently unsupported.
-  return 0.0;
-}
-
-bool GetScrollOffsets(const base::NativeEvent& native_event,
-                      float* x_offset,
-                      float* y_offset,
-                      int* finger_count) {
-  return false;
-}
-
-bool IsNoopEvent(const base::NativeEvent& event) {
-  return ([event type] == NSApplicationDefined && [event subtype] == 0);
-}
-
-base::NativeEvent CreateNoopEvent() {
-  return [NSEvent otherEventWithType:NSApplicationDefined
-                            location:NSZeroPoint
-                       modifierFlags:0
-                           timestamp:[NSDate timeIntervalSinceReferenceDate]
-                        windowNumber:0
-                             context:nil
-                             subtype:0
-                               data1:0
-                               data2:0];
-}
-
-}  // namespace ui