KeyCodes class
Contains the native key codes previously defined in {@link com.google.gwt.user.client.ui.KeyboardListener}. When converting keyboard listener instances, developers can use the following static import to access these constants:
import static com.google.gwt.event.dom.client.KeyCodes.*;
These constants are defined with an int data type in order to be compatible with the constants defined in {@link com.google.gwt.user.client.ui.KeyboardListener}.
class KeyCodes {
 /**
  * Alt key code.
  */
 static const int KEY_ALT = 18;
 /**
  * Backspace key code.
  */
 static const int KEY_BACKSPACE = 8;
 /**
  * Control key code.
  */
 static const int KEY_CTRL = 17;
 /**
  * Delete key code.
  */
 static const int KEY_DELETE = 46;
 /**
  * Down arrow code.
  */
 static const int KEY_DOWN = 40;
 /**
  * End key code.
  */
 static const int KEY_END = 35;
 /**
  * Enter key code.
  */
 static const int KEY_ENTER = 13;
 /**
  * Escape key code.
  */
 static const int KEY_ESCAPE = 27;
 /**
  * Home key code.
  */
 static const int KEY_HOME = 36;
 /**
  * Left key code.
  */
 static const int KEY_LEFT = 37;
 /**
  * Page down key code.
  */
 static const int KEY_PAGEDOWN = 34;
 /**
  * Page up key code.
  */
 static const int KEY_PAGEUP = 33;
 /**
  * Right arrow key code.
  */
 static const int KEY_RIGHT = 39;
 /**
  * Shift key code.
  */
 static const int KEY_SHIFT = 16;
 /**
  * Tab key code.
  */
 static const int KEY_TAB = 9;
 /**
  * Up Arrow key code.
  */
 static const int KEY_UP = 38;
}
Static Properties
const int KEY_ALT #
Alt key code.
static const int KEY_ALT = 18
const int KEY_BACKSPACE #
Backspace key code.
static const int KEY_BACKSPACE = 8
const int KEY_CTRL #
Control key code.
static const int KEY_CTRL = 17
const int KEY_DELETE #
Delete key code.
static const int KEY_DELETE = 46
const int KEY_DOWN #
Down arrow code.
static const int KEY_DOWN = 40
const int KEY_END #
End key code.
static const int KEY_END = 35
const int KEY_ENTER #
Enter key code.
static const int KEY_ENTER = 13
const int KEY_ESCAPE #
Escape key code.
static const int KEY_ESCAPE = 27
const int KEY_HOME #
Home key code.
static const int KEY_HOME = 36
const int KEY_LEFT #
Left key code.
static const int KEY_LEFT = 37
const int KEY_PAGEDOWN #
Page down key code.
static const int KEY_PAGEDOWN = 34
const int KEY_PAGEUP #
Page up key code.
static const int KEY_PAGEUP = 33
const int KEY_RIGHT #
Right arrow key code.
static const int KEY_RIGHT = 39
const int KEY_SHIFT #
Shift key code.
static const int KEY_SHIFT = 16
const int KEY_TAB #
Tab key code.
static const int KEY_TAB = 9
const int KEY_UP #
Up Arrow key code.
static const int KEY_UP = 38