/* TextAction.java --
Copyright (C) 2002, 2004 Free Software Foundation, Inc.
This file is part of GNU Classpath.
GNU Classpath is free software; you can redistribute it and/or modify
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02110-1301 USA.
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making a combined work based on this library. Thus, the terms and
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permission to link this library with independent modules to produce an
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package javax.swing.text;
import java.awt.Component;
import java.awt.KeyboardFocusManager;
import java.awt.Point;
import java.awt.event.ActionEvent;
import java.util.HashMap;
import java.util.Iterator;
import javax.swing.AbstractAction;
import javax.swing.Action;
/**
* TextAction
* @author Andrew Selkirk
*/
public abstract class TextAction extends AbstractAction
{
/**
* Constructor TextAction
* @param name TODO
*/
public TextAction(String name)
{
super(name);
}
/**
* Returns the <code>JTextComponent</code> object associated with the given
* <code>ActionEvent</code>. If the source of the event is not a
* <code>JTextComponent</code> the currently focused text component is returned.
*
* @param event the action event
*
* @return the <code>JTextComponent</code>
*/
protected final JTextComponent getTextComponent(ActionEvent event)
{
JTextComponent target = null;
if (event != null)
{
Object source = event.getSource();
if (source instanceof JTextComponent)
target = (JTextComponent) source;
}
if (target == null)
target = getFocusedComponent();
return target;
}
/**
* Creates a new array of <code>Action</code> containing both given arrays.
*
* @param list1 the first action array
* @param list2 the second action array
*
* @return the augmented array of actions
*/
public static final Action[] augmentList(Action[] list1, Action[] list2)
{
HashMap<Object,Action> actions = new HashMap<Object,Action>();
for (int i = 0; i < list1.length; ++i)
{
Action a = list1[i];
Object name = a.getValue(Action.NAME);
actions.put(name != null ? name : "", a);
}
for (int i = 0; i < list2.length; ++i)
{
Action a = list2[i];
Object name = a.getValue(Action.NAME);
actions.put(name != null ? name : "", a);
}
Action[] augmented = new Action[actions.size()];
int i = 0;
for (Iterator<Action> it = actions.values().iterator(); it.hasNext(); i++)
augmented[i] = it.next();
return augmented;
}
/**
* Returns the current focused <code>JTextComponent</code> object.
*
* @return the <code>JTextComponent</code>
*/
protected final JTextComponent getFocusedComponent()
{
KeyboardFocusManager kfm =
KeyboardFocusManager.getCurrentKeyboardFocusManager();
Component focused = kfm.getPermanentFocusOwner();
JTextComponent textComp = null;
if (focused instanceof JTextComponent)
textComp = (JTextComponent) focused;
return textComp;
}
/** Abstract helper class which implements everything needed for an
* Action implementation in <code>DefaultEditorKit</code> which
* does horizontal movement (and selection).
*/
abstract static class HorizontalMovementAction extends TextAction
{
int dir;
HorizontalMovementAction(String name, int direction)
{
super(name);
dir = direction;
}
public void actionPerformed(ActionEvent event)
{
JTextComponent t = getTextComponent(event);
try
{
if (t != null)
{
int offs
= Utilities.getNextVisualPositionFrom(t,
t.getCaretPosition(),
dir);
Caret c = t.getCaret();
actionPerformedImpl(c, offs);
c.setMagicCaretPosition(t.modelToView(offs).getLocation());
}
}
catch(BadLocationException ble)
{
throw
(InternalError) new InternalError("Illegal offset").initCause(ble);
}
}
protected abstract void actionPerformedImpl(Caret c, int offs)
throws BadLocationException;
}
/** Abstract helper class which implements everything needed for an
* Action implementation in <code>DefaultEditorKit</code> which
* does vertical movement (and selection).
*/
abstract static class VerticalMovementAction extends TextAction
{
int dir;
VerticalMovementAction(String name, int direction)
{
super(name);
dir = direction;
}
public void actionPerformed(ActionEvent event)
{
JTextComponent t = getTextComponent(event);
try
{
if (t != null)
{
Caret c = t.getCaret();
// The magic caret position may be null when the caret
// has not moved yet.
Point mcp = c.getMagicCaretPosition();
int pos;
if (mcp != null)
{
mcp.y = t.modelToView(c.getDot()).y;
pos = t.viewToModel(mcp);
}
else
pos = c.getDot();
pos = Utilities.getNextVisualPositionFrom(t,
t.getCaretPosition(),
dir);
if (pos > -1)
actionPerformedImpl(c, pos);
}
}
catch(BadLocationException ble)
{
throw
(InternalError) new InternalError("Illegal offset").initCause(ble);
}
}
protected abstract void actionPerformedImpl(Caret c, int offs)
throws BadLocationException;
}
}