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authorupstream source tree <ports@midipix.org>2015-03-15 20:14:05 -0400
committerupstream source tree <ports@midipix.org>2015-03-15 20:14:05 -0400
commit554fd8c5195424bdbcabf5de30fdc183aba391bd (patch)
tree976dc5ab7fddf506dadce60ae936f43f58787092 /libjava/classpath/java/awt/TextComponent.java
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+/* TextComponent.java -- Widgets for entering text
+ Copyright (C) 1999, 2002, 2003, 2006, Free Software Foundation, Inc.
+
+This file is part of GNU Classpath.
+
+GNU Classpath 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, or (at your option)
+any later version.
+
+GNU Classpath 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 GNU Classpath; see the file COPYING. If not, write to the
+Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+02110-1301 USA.
+
+Linking this library statically or dynamically with other modules is
+making a combined work based on this library. Thus, the terms and
+conditions of the GNU General Public License cover the whole
+combination.
+
+As a special exception, the copyright holders of this library give you
+permission to link this library with independent modules to produce an
+executable, regardless of the license terms of these independent
+modules, and to copy and distribute the resulting executable under
+terms of your choice, provided that you also meet, for each linked
+independent module, the terms and conditions of the license of that
+module. An independent module is a module which is not derived from
+or based on this library. If you modify this library, you may extend
+this exception to your version of the library, but you are not
+obligated to do so. If you do not wish to do so, delete this
+exception statement from your version. */
+
+
+package java.awt;
+
+import java.awt.event.TextEvent;
+import java.awt.event.TextListener;
+import java.awt.peer.TextComponentPeer;
+import java.io.Serializable;
+import java.text.BreakIterator;
+import java.util.EventListener;
+
+import javax.accessibility.Accessible;
+import javax.accessibility.AccessibleContext;
+import javax.accessibility.AccessibleRole;
+import javax.accessibility.AccessibleState;
+import javax.accessibility.AccessibleStateSet;
+import javax.accessibility.AccessibleText;
+import javax.swing.text.AttributeSet;
+
+/**
+ * This class provides common functionality for widgets than
+ * contain text.
+ *
+ * @author Aaron M. Renn (arenn@urbanophile.com)
+ */
+public class TextComponent extends Component
+ implements Serializable, Accessible
+{
+
+ private static final long serialVersionUID = -2214773872412987419L;
+
+ /**
+ * @serial Indicates whether or not this component is editable.
+ * This is package-private to avoid an accessor method.
+ */
+ boolean editable;
+
+ /**
+ * @serial The starting position of the selected text region.
+ * This is package-private to avoid an accessor method.
+ */
+ int selectionStart;
+
+ /**
+ * @serial The ending position of the selected text region.
+ * This is package-private to avoid an accessor method.
+ */
+ int selectionEnd;
+
+ /**
+ * @serial The text in the component
+ * This is package-private to avoid an accessor method.
+ */
+ String text;
+
+ /**
+ * A list of listeners that will receive events from this object.
+ */
+ protected transient TextListener textListener;
+
+ protected class AccessibleAWTTextComponent
+ extends AccessibleAWTComponent
+ implements AccessibleText, TextListener
+ {
+ private static final long serialVersionUID = 3631432373506317811L;
+
+ // Constructor
+ // Adds a listener for tracking caret changes
+ public AccessibleAWTTextComponent()
+ {
+ TextComponent.this.addTextListener(this);
+ }
+
+ public AccessibleRole getAccessibleRole()
+ {
+ return AccessibleRole.TEXT;
+ }
+
+ public AccessibleStateSet getAccessibleStateSet()
+ {
+ // TODO: Docs say PropertyChangeEvent will fire if this state changes.
+ // That means that the event has to fire when editable changes.
+ AccessibleStateSet ss = super.getAccessibleStateSet();
+ if (editable)
+ ss.add(AccessibleState.EDITABLE);
+ return ss;
+ }
+
+ public AccessibleText getAccessibleText()
+ {
+ return this;
+ }
+
+ /* (non-Javadoc)
+ * @see javax.accessibility.AccessibleText#getIndexAtPoint(java.awt.Point)
+ */
+ public int getIndexAtPoint(Point point)
+ {
+ return TextComponent.this.getIndexAtPoint(point);
+ }
+
+ /* (non-Javadoc)
+ * @see javax.accessibility.AccessibleText#getCharacterBounds(int)
+ */
+ public Rectangle getCharacterBounds(int index)
+ {
+ return TextComponent.this.getCharacterBounds(index);
+ }
+
+ /* (non-Javadoc)
+ * @see javax.accessibility.AccessibleText#getCharCount()
+ */
+ public int getCharCount()
+ {
+ return text.length();
+ }
+
+ /* (non-Javadoc)
+ * @see javax.accessibility.AccessibleText#getCaretPosition()
+ */
+ public int getCaretPosition()
+ {
+ return TextComponent.this.getCaretPosition();
+ }
+
+ /* (non-Javadoc)
+ * @see javax.accessibility.AccessibleText#getAtIndex(int, int)
+ */
+ public String getAtIndex(int part, int index)
+ {
+ if (index < 0 || index >= text.length())
+ return null;
+ BreakIterator it = null;
+ switch (part)
+ {
+ case CHARACTER:
+ return text.substring(index, index + 1);
+ case WORD:
+ it = BreakIterator.getWordInstance();
+ break;
+ case SENTENCE:
+ it = BreakIterator.getSentenceInstance();
+ break;
+ default:
+ return null;
+ }
+ it.setText(text);
+ int start = index;
+ if (!it.isBoundary(index))
+ start = it.preceding(index);
+ int end = it.following(index);
+ if (end == -1)
+ return text.substring(index);
+ else
+ return text.substring(index, end);
+ }
+
+ /* (non-Javadoc)
+ * @see javax.accessibility.AccessibleText#getAfterIndex(int, int)
+ */
+ public String getAfterIndex(int part, int index) {
+ if (index < 0 || index >= text.length())
+ return null;
+ BreakIterator it = null;
+ switch (part)
+ {
+ case CHARACTER:
+ return text.substring(index, index + 1);
+ case WORD:
+ it = BreakIterator.getWordInstance();
+ break;
+ case SENTENCE:
+ it = BreakIterator.getSentenceInstance();
+ break;
+ default:
+ return null;
+ }
+ it.setText(text);
+ int start = index;
+ if (!it.isBoundary(index))
+ start = it.following(index);
+ // Make sure there was a complete unit. I.e. if index is in the middle
+ // of a word, return null if there is no word after the that one.
+ if (start == -1)
+ return null;
+ int end = it.following(start);
+ if (end == -1)
+ return text.substring(index);
+ else
+ return text.substring(index, end);
+ }
+
+ /* (non-Javadoc)
+ * @see javax.accessibility.AccessibleText#getBeforeIndex(int, int)
+ */
+ public String getBeforeIndex(int part, int index)
+ {
+ if (index < 1 || index >= text.length())
+ return null;
+ BreakIterator it = null;
+ switch (part)
+ {
+ case CHARACTER:
+ return text.substring(index - 1, index);
+ case WORD:
+ it = BreakIterator.getWordInstance();
+ break;
+ case SENTENCE:
+ it = BreakIterator.getSentenceInstance();
+ break;
+ default:
+ return null;
+ }
+ it.setText(text);
+ int end = index;
+ if (!it.isBoundary(index))
+ end = it.preceding(index);
+ // Make sure there was a complete unit. I.e. if index is in the middle
+ // of a word, return null if there is no word before that one.
+ if (end == -1)
+ return null;
+ int start = it.preceding(end);
+ if (start == -1)
+ return text.substring(0, end);
+ else
+ return text.substring(start, end);
+ }
+
+ /* (non-Javadoc)
+ * @see javax.accessibility.AccessibleText#getCharacterAttribute(int)
+ */
+ public AttributeSet getCharacterAttribute(int index)
+ {
+ // FIXME: I suspect this really gets filled in by subclasses.
+ return null;
+ }
+
+ /* (non-Javadoc)
+ * @see javax.accessibility.AccessibleText#getSelectionStart()
+ */
+ public int getSelectionStart() {
+ // TODO Auto-generated method stub
+ return selectionStart;
+ }
+
+ /* (non-Javadoc)
+ * @see javax.accessibility.AccessibleText#getSelectionEnd()
+ */
+ public int getSelectionEnd()
+ {
+ return selectionEnd;
+ }
+
+ /* (non-Javadoc)
+ * @see javax.accessibility.AccessibleText#getSelectedText()
+ */
+ public String getSelectedText()
+ {
+ if (selectionEnd - selectionStart > 0)
+ return text.substring(selectionStart, selectionEnd);
+ else
+ return null;
+ }
+
+ /* (non-Javadoc)
+ * @see java.awt.event.TextListener#textValueChanged(java.awt.event.TextEvent)
+ */
+ public void textValueChanged(TextEvent event)
+ {
+ // TODO Auto-generated method stub
+
+ }
+
+ }
+
+
+ TextComponent(String text)
+ {
+ if (text == null)
+ this.text = "";
+ else
+ this.text = text;
+
+ this.editable = true;
+ }
+
+
+ /**
+ * Returns the text in this component
+ *
+ * @return The text in this component.
+ */
+ public synchronized String getText()
+ {
+ TextComponentPeer tcp = (TextComponentPeer) getPeer();
+ if (tcp != null)
+ text = tcp.getText();
+
+ return(text);
+ }
+
+ /**
+ * Sets the text in this component to the specified string.
+ *
+ * @param text The new text for this component.
+ */
+ public synchronized void setText(String text)
+ {
+ if (text == null)
+ text = "";
+
+ this.text = text;
+
+ TextComponentPeer tcp = (TextComponentPeer) getPeer();
+ if (tcp != null)
+ tcp.setText(text);
+ setCaretPosition(0);
+ }
+
+ /**
+ * Returns a string that contains the text that is currently selected.
+ *
+ * @return The currently selected text region.
+ */
+ public synchronized String getSelectedText()
+ {
+ String alltext = getText();
+ int start = getSelectionStart();
+ int end = getSelectionEnd();
+
+ return(alltext.substring(start, end));
+ }
+
+ /**
+ * Returns the starting position of the selected text region.
+ * If the text is not selected then caret position is returned.
+ *
+ * @return The starting position of the selected text region.
+ */
+ public synchronized int getSelectionStart()
+ {
+ TextComponentPeer tcp = (TextComponentPeer) getPeer();
+ if (tcp != null)
+ selectionStart = tcp.getSelectionStart();
+
+ return(selectionStart);
+ }
+
+ /**
+ * Sets the starting position of the selected region to the
+ * specified value. If the specified value is out of range, then it
+ * will be silently changed to the nearest legal value.
+ *
+ * @param selectionStart The new start position for selected text.
+ */
+ public synchronized void setSelectionStart(int selectionStart)
+ {
+ select(selectionStart,
+ (getSelectionEnd() < selectionStart)
+ ? selectionStart : getSelectionEnd());
+ }
+
+ /**
+ * Returns the ending position of the selected text region.
+ * If the text is not selected, then caret position is returned
+ *
+ * @return The ending position of the selected text region.
+ */
+ public synchronized int getSelectionEnd()
+ {
+ TextComponentPeer tcp = (TextComponentPeer) getPeer();
+ if (tcp != null)
+ selectionEnd = tcp.getSelectionEnd();
+
+ return(selectionEnd);
+ }
+
+ /**
+ * Sets the ending position of the selected region to the
+ * specified value. If the specified value is out of range, then it
+ * will be silently changed to the nearest legal value.
+ *
+ * @param selectionEnd The new start position for selected text.
+ */
+ public synchronized void setSelectionEnd(int selectionEnd)
+ {
+ select(getSelectionStart(), selectionEnd);
+ }
+
+ /**
+ * This method sets the selected text range to the text between the
+ * specified start and end positions. Illegal values for these
+ * positions are silently fixed.
+ *
+ * @param selectionStart The new start position for the selected text.
+ * @param selectionEnd The new end position for the selected text.
+ */
+ public synchronized void select(int selectionStart, int selectionEnd)
+ {
+ if (selectionStart < 0)
+ selectionStart = 0;
+
+ if (selectionStart > getText().length())
+ selectionStart = text.length();
+
+ if (selectionEnd > text.length())
+ selectionEnd = text.length();
+
+ if (selectionStart > selectionEnd)
+ selectionStart = selectionEnd;
+
+ this.selectionStart = selectionStart;
+ this.selectionEnd = selectionEnd;
+
+ TextComponentPeer tcp = (TextComponentPeer) getPeer();
+ if (tcp != null)
+ tcp.select(selectionStart, selectionEnd);
+ }
+
+ /**
+ * Selects all of the text in the component.
+ */
+ public synchronized void selectAll()
+ {
+ select(0, getText().length());
+ }
+
+ /**
+ * Returns the current caret position in the text.
+ *
+ * @return The caret position in the text.
+ */
+ public synchronized int getCaretPosition()
+ {
+ TextComponentPeer tcp = (TextComponentPeer) getPeer();
+ if (tcp != null)
+ return(tcp.getCaretPosition());
+ else
+ return(0);
+ }
+
+ /**
+ * Sets the caret position to the specified value.
+ *
+ * @param caretPosition The new caret position.
+ *
+ * @exception IllegalArgumentException If the value supplied for position
+ * is less than zero.
+ *
+ * @since 1.1
+ */
+ public synchronized void setCaretPosition(int caretPosition)
+ {
+ if (caretPosition < 0)
+ throw new IllegalArgumentException();
+
+ TextComponentPeer tcp = (TextComponentPeer) getPeer();
+ if (tcp != null)
+ tcp.setCaretPosition(caretPosition);
+ }
+
+ /**
+ * Tests whether or not this component's text can be edited.
+ *
+ * @return <code>true</code> if the text can be edited, <code>false</code>
+ * otherwise.
+ */
+ public boolean isEditable()
+ {
+ return(editable);
+ }
+
+ /**
+ * Sets whether or not this component's text can be edited.
+ *
+ * @param editable <code>true</code> to enable editing of the text,
+ * <code>false</code> to disable it.
+ */
+ public synchronized void setEditable(boolean editable)
+ {
+ this.editable = editable;
+
+ TextComponentPeer tcp = (TextComponentPeer) getPeer();
+ if (tcp != null)
+ tcp.setEditable(editable);
+ }
+
+ /**
+ * Notifies the component that it should destroy its native peer.
+ */
+ public void removeNotify()
+ {
+ super.removeNotify();
+ }
+
+ /**
+ * Adds a new listener to the list of text listeners for this
+ * component.
+ *
+ * @param listener The listener to be added.
+ */
+ public synchronized void addTextListener(TextListener listener)
+ {
+ textListener = AWTEventMulticaster.add(textListener, listener);
+
+ enableEvents(AWTEvent.TEXT_EVENT_MASK);
+ }
+
+ /**
+ * Removes the specified listener from the list of listeners
+ * for this component.
+ *
+ * @param listener The listener to remove.
+ */
+ public synchronized void removeTextListener(TextListener listener)
+ {
+ textListener = AWTEventMulticaster.remove(textListener, listener);
+ }
+
+ /**
+ * Processes the specified event for this component. Text events are
+ * processed by calling the <code>processTextEvent()</code> method.
+ * All other events are passed to the superclass method.
+ *
+ * @param event The event to process.
+ */
+ protected void processEvent(AWTEvent event)
+ {
+ if (event instanceof TextEvent)
+ processTextEvent((TextEvent)event);
+ else
+ super.processEvent(event);
+ }
+
+ /**
+ * Processes the specified text event by dispatching it to any listeners
+ * that are registered. Note that this method will only be called
+ * if text event's are enabled. This will be true if there are any
+ * registered listeners, or if the event has been specifically
+ * enabled using <code>enableEvents()</code>.
+ *
+ * @param event The text event to process.
+ */
+ protected void processTextEvent(TextEvent event)
+ {
+ if (textListener != null)
+ textListener.textValueChanged(event);
+ }
+
+ void dispatchEventImpl(AWTEvent e)
+ {
+ if (e.id <= TextEvent.TEXT_LAST
+ && e.id >= TextEvent.TEXT_FIRST
+ && (textListener != null
+ || (eventMask & AWTEvent.TEXT_EVENT_MASK) != 0))
+ processEvent(e);
+ else
+ super.dispatchEventImpl(e);
+ }
+
+ /**
+ * Returns a debugging string.
+ *
+ * @return A debugging string.
+ */
+ protected String paramString()
+ {
+ return(getClass().getName() + "(text=" + getText() + ")");
+ }
+
+ /**
+ * Returns an array of all the objects currently registered as FooListeners
+ * upon this <code>TextComponent</code>. FooListeners are registered using
+ * the addFooListener method.
+ *
+ * @exception ClassCastException If listenerType doesn't specify a class or
+ * interface that implements java.util.EventListener.
+ */
+ public <T extends EventListener> T[] getListeners(Class<T> listenerType)
+ {
+ if (listenerType == TextListener.class)
+ return AWTEventMulticaster.getListeners(textListener, listenerType);
+
+ return super.getListeners(listenerType);
+ }
+
+ /**
+ * Returns all text listeners registered to this object.
+ */
+ public TextListener[] getTextListeners()
+ {
+ return (TextListener[]) getListeners(TextListener.class);
+ }
+
+ /**
+ * Gets the AccessibleContext associated with this <code>TextComponent</code>.
+ * The context is created, if necessary.
+ *
+ * @return the associated context
+ */
+ public AccessibleContext getAccessibleContext()
+ {
+ /* Create the context if this is the first request */
+ if (accessibleContext == null)
+ accessibleContext = new AccessibleAWTTextComponent();
+ return accessibleContext;
+ }
+
+
+ // Provide AccessibleAWTTextComponent access to several peer functions that
+ // aren't publicly exposed. This is package-private to avoid an accessor
+ // method.
+ synchronized int getIndexAtPoint(Point p)
+ {
+ TextComponentPeer tcp = (TextComponentPeer) getPeer();
+ if (tcp != null)
+ return tcp.getIndexAtPoint(p.x, p.y);
+ return -1;
+ }
+
+ synchronized Rectangle getCharacterBounds(int i)
+ {
+ TextComponentPeer tcp = (TextComponentPeer) getPeer();
+ if (tcp != null)
+ return tcp.getCharacterBounds(i);
+ return null;
+ }
+
+ /**
+ * All old mouse events for this component should
+ * be ignored.
+ *
+ * @return true to ignore all old mouse events.
+ */
+ static boolean ignoreOldMouseEvents()
+ {
+ return true;
+ }
+
+} // class TextComponent