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// 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 "ui/views/events/event.h"

#include <gdk/gdk.h>
#include <gdk/gdkx.h>
#include <X11/extensions/XInput2.h>
#include <X11/Xlib.h>

#include "base/logging.h"
#include "base/utf_string_conversions.h"
#include "ui/base/events.h"
#include "ui/base/keycodes/keyboard_code_conversion.h"
#include "ui/base/keycodes/keyboard_code_conversion_x.h"
#include "ui/base/touch/touch_factory.h"
#include "ui/views/widget/root_view.h"

namespace views {

////////////////////////////////////////////////////////////////////////////////
// KeyEvent, public:

uint16 KeyEvent::GetCharacter() const {
  if (character_)
    return character_;

  if (!native_event()) {
    return ui::GetCharacterFromKeyCode(key_code_, flags());
  }

  DCHECK(native_event()->type == KeyPress ||
         native_event()->type == KeyRelease);

  uint16 ch = 0;
  if (!IsControlDown())
    ch = ui::GetCharacterFromXEvent(native_event());
  return ch ? ch : ui::GetCharacterFromKeyCode(key_code_, flags());
}

uint16 KeyEvent::GetUnmodifiedCharacter() const {
  if (unmodified_character_)
    return unmodified_character_;

  if (!native_event()) {
    return ui::GetCharacterFromKeyCode(key_code_, flags() & ui::EF_SHIFT_DOWN);
  }

  DCHECK(native_event()->type == KeyPress ||
         native_event()->type == KeyRelease);

  static const unsigned int kIgnoredModifiers = ControlMask | LockMask |
      Mod1Mask | Mod2Mask | Mod3Mask | Mod4Mask | Mod5Mask;

  XKeyEvent copy = native_event()->xkey;  // bit-wise copy is safe.
  // We can't use things like (native_event()->xkey.state & ShiftMask), as it
  // may mask out bits used by X11 internally.
  copy.state &= ~kIgnoredModifiers;
  uint16 ch = ui::GetCharacterFromXEvent(reinterpret_cast<XEvent*>(&copy));
  return ch ? ch :
      ui::GetCharacterFromKeyCode(key_code_, flags() & ui::EF_SHIFT_DOWN);
}

////////////////////////////////////////////////////////////////////////////////
// TouchEvent, public:

TouchEvent::TouchEvent(const base::NativeEvent& native_event)
    : LocatedEvent(native_event),
      touch_id_(ui::GetTouchId(native_event)),
      radius_x_(ui::GetTouchRadiusX(native_event)),
      radius_y_(ui::GetTouchRadiusY(native_event)),
      rotation_angle_(ui::GetTouchAngle(native_event)),
      force_(ui::GetTouchForce(native_event)) {
#if defined(USE_XI2_MT)
  if (type() == ui::ET_TOUCH_RELEASED) {
    // NOTE: The slot is allocated by TouchFactory for each XI_TouchBegin
    //       event, which carries a new tracking ID to identify a new touch
    //       sequence.
    ui::TouchFactory* factory = ui::TouchFactory::GetInstance();
    float tracking_id;
    if (factory->ExtractTouchParam(*native_event,
                                   ui::TouchFactory::TP_TRACKING_ID,
                                   &tracking_id)) {
      factory->ReleaseSlotForTrackingID(tracking_id);
    }
  }
#else
  if (type() == ui::ET_TOUCH_PRESSED || type() == ui::ET_TOUCH_RELEASED) {
    ui::TouchFactory* factory = ui::TouchFactory::GetInstance();
    float slot;
    if (factory->ExtractTouchParam(*native_event,
                                   ui::TouchFactory::TP_SLOT_ID, &slot)) {
      factory->SetSlotUsed(slot, type() == ui::ET_TOUCH_PRESSED);
    }
  }
#endif
}

}  // namespace views