/jEdit/tags/jedit-4-0-pre5/org/gjt/sp/jedit/gui/DefaultInputHandler.java
Java | 414 lines | 272 code | 33 blank | 109 comment | 66 complexity | 1a1f3d771f86efd62bd89e354d385c8a MD5 | raw file
Possible License(s): BSD-3-Clause, AGPL-1.0, Apache-2.0, LGPL-2.0, LGPL-3.0, GPL-2.0, CC-BY-SA-3.0, LGPL-2.1, GPL-3.0, MPL-2.0-no-copyleft-exception, IPL-1.0
- /*
- * DefaultInputHandler.java - Default implementation of an input handler
- * :tabSize=8:indentSize=8:noTabs=false:
- * :folding=explicit:collapseFolds=1:
- *
- * Copyright (C) 1999, 2000, 2001 Slava Pestov
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation; either version 2
- * of the License, or any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
- */
- package org.gjt.sp.jedit.gui;
- //{{{ Imports
- import javax.swing.KeyStroke;
- import java.awt.event.*;
- import java.awt.Toolkit;
- import java.util.Hashtable;
- import java.util.StringTokenizer;
- import org.gjt.sp.jedit.*;
- import org.gjt.sp.util.Log;
- //}}}
- /**
- * The default input handler. It maps sequences of keystrokes into actions
- * and inserts key typed events into the text area.
- * @author Slava Pestov
- * @version $Id: DefaultInputHandler.java 4012 2002-02-05 06:28:10Z spestov $
- */
- public class DefaultInputHandler extends InputHandler
- {
- //{{{ DefaultInputHandler constructor
- /**
- * Creates a new input handler with no key bindings defined.
- * @param view The view
- */
- public DefaultInputHandler(View view)
- {
- super(view);
- bindings = currentBindings = new Hashtable();
- } //}}}
- //{{{ DefaultInputHandler constructor
- /**
- * Creates a new input handler with the same set of key bindings
- * as the one specified. Note that both input handlers share
- * a pointer to exactly the same key binding table; so adding
- * a key binding in one will also add it to the other.
- * @param copy The input handler to copy key bindings from
- * @param view The view
- */
- public DefaultInputHandler(View view, DefaultInputHandler copy)
- {
- super(view);
- bindings = currentBindings = copy.bindings;
- } //}}}
- //{{{ addKeyBinding() method
- /**
- * Adds a key binding to this input handler. The key binding is
- * a list of white space separated key strokes of the form
- * <i>[modifiers+]key</i> where modifier is C for Control, A for Alt,
- * or S for Shift, and key is either a character (a-z) or a field
- * name in the KeyEvent class prefixed with VK_ (e.g., BACK_SPACE)
- * @param keyBinding The key binding
- * @param action The action
- */
- public void addKeyBinding(String keyBinding, EditAction action)
- {
- Hashtable current = bindings;
- StringTokenizer st = new StringTokenizer(keyBinding);
- while(st.hasMoreTokens())
- {
- KeyStroke keyStroke = parseKeyStroke(st.nextToken());
- if(keyStroke == null)
- return;
- if(st.hasMoreTokens())
- {
- Object o = current.get(keyStroke);
- if(o instanceof Hashtable)
- current = (Hashtable)o;
- else
- {
- o = new Hashtable();
- current.put(keyStroke,o);
- current = (Hashtable)o;
- }
- }
- else
- current.put(keyStroke,action);
- }
- } //}}}
- //{{{ removeKeyBinding() method
- /**
- * Removes a key binding from this input handler. This is not yet
- * implemented.
- * @param keyBinding The key binding
- */
- public void removeKeyBinding(String keyBinding)
- {
- throw new InternalError("Not yet implemented");
- } //}}}
- //{{{ removeAllKeyBindings() method
- /**
- * Removes all key bindings from this input handler.
- */
- public void removeAllKeyBindings()
- {
- bindings.clear();
- } //}}}
- //{{{ getKeyBinding() method
- /**
- * Returns either an edit action, or a hashtable if the specified key
- * is a prefix.
- * @param keyBinding The key binding
- * @since jEdit 3.2pre5
- */
- public Object getKeyBinding(String keyBinding)
- {
- Hashtable current = bindings;
- StringTokenizer st = new StringTokenizer(keyBinding);
- while(st.hasMoreTokens())
- {
- KeyStroke keyStroke = parseKeyStroke(st.nextToken());
- if(keyStroke == null)
- return null;
- if(st.hasMoreTokens())
- {
- Object o = current.get(keyStroke);
- if(o instanceof Hashtable)
- current = (Hashtable)o;
- else
- return o;
- }
- else
- {
- return current.get(keyStroke);
- }
- }
- return null;
- } //}}}
- //{{{ isPrefixActive() method
- /**
- * Returns if a prefix key has been pressed.
- */
- public boolean isPrefixActive()
- {
- return bindings != currentBindings;
- } //}}}
- //{{{ keyPressed() method
- /**
- * Handle a key pressed event. This will look up the binding for
- * the key stroke and execute it.
- */
- public void keyPressed(KeyEvent evt)
- {
- int keyCode = evt.getKeyCode();
- int modifiers = evt.getModifiers();
- if(!((evt.isControlDown() ^ evt.isAltDown())
- || evt.isMetaDown()))
- {
- // if modifier active, handle all keys, otherwise
- // only some
- if((keyCode >= KeyEvent.VK_A && keyCode <= KeyEvent.VK_Z)
- || (keyCode >= KeyEvent.VK_0 && keyCode <= KeyEvent.VK_9))
- {
- return;
- }
- else if(keyCode == KeyEvent.VK_SPACE)
- {
- return;
- }
- else if(readNextChar != null)
- {
- if(keyCode == KeyEvent.VK_ESCAPE)
- {
- readNextChar = null;
- view.getStatus().setMessage(null);
- }
- else if(!evt.isActionKey()
- && keyCode != KeyEvent.VK_TAB
- && keyCode != KeyEvent.VK_ENTER)
- {
- return;
- }
- }
- else
- {
- // ok even with no modifiers
- }
- }
- KeyStroke keyStroke = KeyStroke.getKeyStroke(keyCode,
- modifiers);
- Object o = currentBindings.get(keyStroke);
- if(o == null)
- {
- // Don't beep if the user presses some
- // key we don't know about unless a
- // prefix is active. Otherwise it will
- // beep when caps lock is pressed, etc.
- if(currentBindings != bindings)
- {
- Toolkit.getDefaultToolkit().beep();
- // F10 should be passed on, but C+e F10
- // shouldn't
- repeatCount = 0;
- repeat = false;
- evt.consume();
- currentBindings = bindings;
- }
- else if(modifiers == 0 && (keyCode == KeyEvent.VK_ENTER
- || keyCode == KeyEvent.VK_TAB))
- {
- userInput((char)keyCode);
- evt.consume();
- }
- }
- if(readNextChar != null)
- {
- readNextChar = null;
- view.getStatus().setMessage(null);
- }
- if(o instanceof EditAction)
- {
- currentBindings = bindings;
- invokeAction((EditAction)o);
- evt.consume();
- }
- else if(o instanceof Hashtable)
- {
- currentBindings = (Hashtable)o;
- evt.consume();
- }
- } //}}}
- //{{{ keyTyped() method
- /**
- * Handle a key typed event. This inserts the key into the text area.
- */
- public void keyTyped(KeyEvent evt)
- {
- char c = evt.getKeyChar();
- // ignore
- if(c == '\b')
- return;
- KeyStroke keyStroke;
- // this is a hack. a literal space is impossible to
- // insert in a key binding string, but you can write
- // SPACE.
- switch(c)
- {
- case ' ':
- keyStroke = KeyStroke.getKeyStroke(KeyEvent.VK_SPACE,
- evt.getModifiers());
- break;
- case '\t':
- keyStroke = KeyStroke.getKeyStroke(KeyEvent.VK_TAB,
- evt.getModifiers());
- break;
- case '\n':
- keyStroke = KeyStroke.getKeyStroke(KeyEvent.VK_ENTER,
- evt.getModifiers());
- break;
- default:
- keyStroke = KeyStroke.getKeyStroke(c);
- break;
- }
- Object o = currentBindings.get(keyStroke);
- if(o instanceof Hashtable)
- {
- currentBindings = (Hashtable)o;
- }
- else if(o instanceof EditAction)
- {
- currentBindings = bindings;
- invokeAction((EditAction)o);
- }
- else
- {
- // otherwise, reset to default map and do user input
- currentBindings = bindings;
- if(repeat && Character.isDigit(c))
- {
- repeatCount *= 10;
- repeatCount += (c - '0');
- view.getStatus().setMessage(null);
- }
- else
- userInput(c);
- }
- } //}}}
- //{{{ parseKeyStroke() method
- /**
- * Converts a string to a keystroke. The string should be of the
- * form <i>modifiers</i>+<i>shortcut</i> where <i>modifiers</i>
- * is any combination of A for Alt, C for Control, S for Shift
- * or M for Meta, and <i>shortcut</i> is either a single character,
- * or a keycode name from the <code>KeyEvent</code> class, without
- * the <code>VK_</code> prefix.
- * @param keyStroke A string description of the key stroke
- */
- public static KeyStroke parseKeyStroke(String keyStroke)
- {
- if(keyStroke == null)
- return null;
- int modifiers = 0;
- int index = keyStroke.indexOf('+');
- if(index != -1)
- {
- for(int i = 0; i < index; i++)
- {
- switch(Character.toUpperCase(keyStroke
- .charAt(i)))
- {
- case 'A':
- modifiers |= InputEvent.ALT_MASK;
- break;
- case 'C':
- if(OperatingSystem.isMacOS())
- modifiers |= InputEvent.META_MASK;
- else
- modifiers |= InputEvent.CTRL_MASK;
- break;
- case 'M':
- if(OperatingSystem.isMacOS())
- modifiers |= InputEvent.CTRL_MASK;
- else
- modifiers |= InputEvent.META_MASK;
- break;
- case 'S':
- modifiers |= InputEvent.SHIFT_MASK;
- break;
- }
- }
- }
- String key = keyStroke.substring(index + 1);
- if(key.length() == 1)
- {
- char ch = key.charAt(0);
- if(modifiers == 0)
- return KeyStroke.getKeyStroke(ch);
- else
- {
- return KeyStroke.getKeyStroke(Character.toUpperCase(ch),
- modifiers);
- }
- }
- else if(key.length() == 0)
- {
- Log.log(Log.ERROR,DefaultInputHandler.class,
- "Invalid key stroke: " + keyStroke);
- return null;
- }
- else
- {
- int ch;
- try
- {
- ch = KeyEvent.class.getField("VK_".concat(key))
- .getInt(null);
- }
- catch(Exception e)
- {
- Log.log(Log.ERROR,DefaultInputHandler.class,
- "Invalid key stroke: "
- + keyStroke);
- return null;
- }
- return KeyStroke.getKeyStroke(ch,modifiers);
- }
- } //}}}
- //{{{ Private members
- private Hashtable bindings;
- private Hashtable currentBindings;
- //}}}
- }