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Eclipse Platform
Release 3.5
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org.eclipse.jface.bindings.keys
Class KeyStroke


java.lang.Object
  extended by 

org.eclipse.jface.bindings.Trigger
      extended by 
org.eclipse.jface.bindings.keys.KeyStroke
All Implemented Interfaces:
Comparable 
public final class KeyStroke

extends 
Trigger

implements 
Comparable

A KeyStroke is defined as an optional set of modifier keys followed optionally by a natural key. A KeyStroke is said to be complete if it contains a natural key. A natural key is any Unicode character (e.g., "backspace", etc.), any character belonging to a natural language (e.g., "A", "1", "[", etc.), or any special control character specific to computers (e.g., "F10", "PageUp", etc.).

All KeyStroke objects have a formal string representation available via the toString() method. There are a number of methods to get instances of KeyStroke objects, including one which can parse this formal string representation.

All KeyStroke objects, via the format() method, provide a version of their formal string representation translated by platform and locale, suitable for display to a user.

KeyStroke objects are immutable. Clients are not permitted to extend this class.

Since:
3.1

Field Summary
static  String KEY_DELIMITER
          The delimiter between multiple keys in a single key strokes -- expressed in the formal key stroke grammar.
static  String KEY_DELIMITERS
          The set of delimiters for Key objects allowed during parsing of the formal string representation.
static int NO_KEY
          The representation for no key.
 
Method Summary
 int compareTo ( Object object)
           
 boolean equals ( Object object)
          Tests whether this object is equal to another object.
  String format ()
          Formats this key stroke into the current default look.
static  KeyStroke getInstance (int naturalKey)
          Creates an instance of KeyStroke given a natural key.
static  KeyStroke getInstance (int modifierKeys, int naturalKey)
          Creates an instance of KeyStroke given a set of modifier keys and a natural key.
static  KeyStroke getInstance ( String string)
          Creates an instance of KeyStroke by parsing a given a formal string representation.
 int getModifierKeys ()
          Returns the modifier keys for this key stroke.
 int getNaturalKey ()
          Returns the natural key for this key stroke.
 int hashCode ()
          Computes the hash code for this object.
 boolean isComplete ()
          Returns whether or not this key stroke is complete.
  String toString ()
          Returns the formal string representation for this key stroke.
 
Methods inherited from class java.lang. Object
clone, finalize, getClass, notify, notifyAll, wait, wait, wait
 

Field Detail

KEY_DELIMITER

public static final 
String KEY_DELIMITER
The delimiter between multiple keys in a single key strokes -- expressed in the formal key stroke grammar. This is not to be displayed to the user. It is only intended as an internal representation.

See Also:
Constant Field Values

KEY_DELIMITERS

public static final 
String KEY_DELIMITERS
The set of delimiters for Key objects allowed during parsing of the formal string representation.

See Also:
Constant Field Values

NO_KEY

public static final int NO_KEY
The representation for no key.

See Also:
Constant Field Values
Method Detail

getInstance

public static final 
KeyStroke getInstance(int naturalKey)
Creates an instance of KeyStroke given a natural key.

Parameters:
naturalKey - the natural key. The format of this integer is defined by whichever widget toolkit you are using; NO_KEY always means no natural key.
Returns:
a key stroke. This key stroke will have no modifier keys. Guaranteed not to be null.
See Also:
SWTKeySupport

getInstance

public static final 
KeyStroke getInstance(int modifierKeys,
                                          int naturalKey)
Creates an instance of KeyStroke given a set of modifier keys and a natural key.

Parameters:
modifierKeys - the modifier keys. The format of this integer is defined by whichever widget toolkit you are using; NO_KEY always means no modifier keys.
naturalKey - the natural key. The format of this integer is defined by whichever widget toolkit you are using; NO_KEY always means no natural key.
Returns:
a key stroke. Guaranteed not to be null.
See Also:
SWTKeySupport

getInstance

public static final 
KeyStroke getInstance(
String string)
                                   throws 
ParseException
Creates an instance of KeyStroke by parsing a given a formal string representation.

Parameters:
string - the formal string representation to parse.
Returns:
a key stroke. Guaranteed not to be null.
Throws:
ParseException - if the given formal string representation could not be parsed to a valid key stroke.

compareTo

public final int compareTo(
Object object)
Specified by:
compareTo in interface Comparable

equals

public final boolean equals(
Object object)
Description copied from class: Trigger
Tests whether this object is equal to another object. A handle object is only equal to another trigger with the same properties.

Specified by:
equals in class Trigger
Parameters:
object - The object with which to compare; may be null.
Returns:
true if the objects are equal; false otherwise.

format

public final 
String format()
Formats this key stroke into the current default look.

Returns:
A string representation for this key stroke using the default look; never null.

getModifierKeys

public final int getModifierKeys()
Returns the modifier keys for this key stroke.

Returns:
the bit mask of modifier keys; NO_KEY means that there is no modifier key.

getNaturalKey

public final int getNaturalKey()
Returns the natural key for this key stroke.

Returns:
The natural key for this key stroke. This value is NO_KEY if the key stroke is incomplete (i.e., has no natural key).

hashCode

public final int hashCode()
Description copied from class: Trigger
Computes the hash code for this object.

Specified by:
hashCode in class Trigger
Returns:
The hash code for this object.

isComplete

public final boolean isComplete()
Returns whether or not this key stroke is complete. Key strokes are complete iff they have a natural key which is not NO_KEY.

Returns:
true, iff the key stroke is complete.

toString

public final 
String toString()
Returns the formal string representation for this key stroke.

Overrides:
toString in class Object
Returns:
The formal string representation for this key stroke. Guaranteed not to be null.
See Also:
Object.toString()
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