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266 lines (223 loc) · 6.87 KB
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package bdv.behaviour;
import java.awt.AWTKeyStroke;
import java.awt.event.InputEvent;
import java.util.Collections;
import java.util.HashMap;
import java.util.Map;
import java.util.StringTokenizer;
import javax.swing.KeyStroke;
import gnu.trove.TIntCollection;
import gnu.trove.iterator.TIntIterator;
import gnu.trove.set.TIntSet;
import gnu.trove.set.hash.TIntHashSet;
/**
* A combination of keys, mouse buttons, and/or mouse scrolling that can trigger a {@link Behaviour}.
*
* <p>
* Parsing String in {@link #getFromString(String)} borrows heavily from {@link AWTKeyStroke}.
*
* @author Tobias Pietzsch <tobias.pietzsch@gmail.com>
*/
public class InputTrigger
{
static final int DOUBLE_CLICK_MASK = 1 << 20;
static final int SCROLL_MASK = 1 << 21;
static final int WIN_DOWN_MASK = 1 << 22;
/**
* Word to use to specify a double-click modifier.
*/
private static final String DOUBLE_CLICK_TEXT = "double-click";
/**
* Word to use to specify scrolling.
*/
private static final String SCROLL_TEXT = "scroll";
/**
* Word used to specify the windows key.
*/
private static final String WINDOWS_TEXT= "win";
private final int mask;
private final TIntSet pressedKeys;
private final KeyStroke keyStroke;
private final int hashcode;
public static InputTrigger getFromString( final String s ) throws IllegalArgumentException
{
if ( s == null || s.length() == 0 )
return null;
final StringTokenizer st = new StringTokenizer(s, " ");
final Map<String, Integer> modifierKeywords = getModifierKeywords();
int mask = 0;
final TIntSet pressedKeys = new TIntHashSet();
final int count = st.countTokens();
for ( int i = 1; i <= count; i++ )
{
final String token = st.nextToken();
if ( token.equals( "released" ) )
{}
else if ( token.equals( "pressed" ) )
{}
else if ( token.equals( "typed" ) )
{}
else
{
final Integer tokenMask = modifierKeywords.get( token );
if ( tokenMask != null )
{
mask |= tokenMask.intValue();
}
else
{
final KeyStroke ks = KeyStroke.getKeyStroke( token );
if ( ks == null || ks.getKeyCode() == 0 )
throw new IllegalArgumentException( "InputTrigger String \"" + s + "\" is formatted incorrectly" );
pressedKeys.add( ks.getKeyCode() );
}
}
}
KeyStroke keyStroke = null;
if ( ( mask & ( DOUBLE_CLICK_MASK | InputEvent.BUTTON1_DOWN_MASK | InputEvent.BUTTON2_DOWN_MASK | InputEvent.BUTTON3_DOWN_MASK ) ) == 0 )
{
// no mouse keys, no double-click -- pure keystroke
keyStroke = KeyStroke.getKeyStroke( s );
}
return getCached( new InputTrigger( mask, pressedKeys, keyStroke ) );
}
private InputTrigger( final int mask, final TIntSet pressedKeys, final KeyStroke keyStroke )
{
this.mask = mask;
this.pressedKeys = pressedKeys;
this.keyStroke = keyStroke;
int value = 17;
value = 31 * value + mask;
value = 31 * value + pressedKeys.hashCode();
hashcode = value;
}
public int getMask()
{
return mask;
}
public TIntCollection getPressedKeys()
{
return pressedKeys;
}
public boolean isKeyTriggered()
{
return ( mask & ( InputEvent.BUTTON1_DOWN_MASK | InputEvent.BUTTON2_DOWN_MASK | InputEvent.BUTTON3_DOWN_MASK | SCROLL_MASK ) ) == 0;
}
public boolean isKeyStroke()
{
return keyStroke != null;
}
public KeyStroke getKeyStroke()
{
return keyStroke;
}
public boolean matches( final int mask, final TIntSet keys )
{
if ( this.mask != mask )
return false;
else
return keys.equals( pressedKeys );
}
@Override
public int hashCode()
{
return hashcode;
}
@Override
public boolean equals( final Object obj )
{
if ( obj == this )
return true;
if ( ! InputTrigger.class.isInstance( obj ) )
return false;
final InputTrigger o = ( InputTrigger ) obj;
return mask == o.mask && pressedKeys.equals( o.pressedKeys );
}
@Override
public String toString()
{
final StringBuilder buf = new StringBuilder();
addModifierText( InputEvent.SHIFT_DOWN_MASK, "shift", buf );
addModifierText( InputEvent.CTRL_DOWN_MASK, "ctrl", buf );
addModifierText( InputEvent.META_DOWN_MASK, "meta", buf );
addModifierText( InputEvent.ALT_DOWN_MASK, "alt", buf );
addModifierText( InputEvent.ALT_GRAPH_DOWN_MASK, "altGraph", buf );
addModifierText( InputEvent.BUTTON1_DOWN_MASK, "button1", buf );
addModifierText( InputEvent.BUTTON2_DOWN_MASK, "button2", buf );
addModifierText( InputEvent.BUTTON3_DOWN_MASK, "button3", buf );
addModifierText( DOUBLE_CLICK_MASK, DOUBLE_CLICK_TEXT, buf );
addModifierText( SCROLL_MASK, SCROLL_TEXT, buf );
addModifierText( WIN_DOWN_MASK, WINDOWS_TEXT, buf );
final TIntIterator iter = pressedKeys.iterator();
while ( iter.hasNext() )
{
final int key = iter.next();
if ( buf.length() > 0 )
buf.append( " " );
final String vkName = KeyStroke.getKeyStroke( key, 0 ).toString();
buf.append( vkName.replace( "pressed ", "" ) );
}
return buf.toString();
}
private void addModifierText( final int flag, final String name, final StringBuilder buf )
{
if ( ( mask & flag ) != 0 )
{
if ( buf.length() > 0 )
buf.append( " " );
buf.append( name );
}
}
/*
* Caching
*/
private static Map< String, Integer > modifierKeywords;
private synchronized static Map<String, Integer> getModifierKeywords()
{
if ( modifierKeywords == null )
{
final Map< String, Integer > uninitializedMap = new HashMap<>( 8, 1.0f );
uninitializedMap.put( "shift",
Integer.valueOf( InputEvent.SHIFT_DOWN_MASK ) );
uninitializedMap.put( "control",
Integer.valueOf( InputEvent.CTRL_DOWN_MASK ) );
uninitializedMap.put( "ctrl",
Integer.valueOf( InputEvent.CTRL_DOWN_MASK ) );
uninitializedMap.put( "meta",
Integer.valueOf( InputEvent.META_DOWN_MASK ) );
uninitializedMap.put( "alt",
Integer.valueOf( InputEvent.ALT_DOWN_MASK ) );
uninitializedMap.put( "altGraph",
Integer.valueOf( InputEvent.ALT_GRAPH_DOWN_MASK ) );
uninitializedMap.put( "button1",
Integer.valueOf( InputEvent.BUTTON1_DOWN_MASK ) );
uninitializedMap.put( "button2",
Integer.valueOf( InputEvent.BUTTON2_DOWN_MASK ) );
uninitializedMap.put( "button3",
Integer.valueOf( InputEvent.BUTTON3_DOWN_MASK ) );
uninitializedMap.put( DOUBLE_CLICK_TEXT,
Integer.valueOf( DOUBLE_CLICK_MASK ) );
uninitializedMap.put( SCROLL_TEXT,
Integer.valueOf( SCROLL_MASK ) );
uninitializedMap.put( WINDOWS_TEXT,
Integer.valueOf( WIN_DOWN_MASK ) );
modifierKeywords =
Collections.synchronizedMap( uninitializedMap );
}
return modifierKeywords;
}
private static Map< InputTrigger, InputTrigger > cache;
private synchronized static InputTrigger getCached( final InputTrigger buttonsAndKeys )
{
if ( cache == null )
cache = new HashMap<>();
final InputTrigger b = cache.get( buttonsAndKeys );
if ( b == null )
{
cache.put( buttonsAndKeys, buttonsAndKeys );
return buttonsAndKeys;
}
else
return b;
}
}