Java example source code file (JFormattedTextField.java)
The JFormattedTextField.java Java example source code/* * Copyright (c) 2000, 2013, Oracle and/or its affiliates. All rights reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation. Oracle designates this * particular file as subject to the "Classpath" exception as provided * by Oracle in the LICENSE file that accompanied this code. * * This code 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 * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. */ package javax.swing; import java.awt.*; import java.awt.event.*; import java.awt.im.InputContext; import java.io.*; import java.text.*; import java.util.*; import javax.swing.UIManager; import javax.swing.event.*; import javax.swing.plaf.UIResource; import javax.swing.text.*; /** * <code>JFormattedTextField extends | Value | Description | |
|---|---|---|---|
JFormattedTextField.REVERT
* <td>Revert the display to match that of getValue,
* possibly losing the current edit.
* <tr> | JFormattedTextField.COMMIT * <td>Commits the current value. If the value being edited * isn't considered a legal value by the * <code>AbstractFormatter that is, a * <code>ParseException is thrown, then the value * will not change, and then edited value will persist. * <tr> | JFormattedTextField.COMMIT_OR_REVERT
* <td>Similar to COMMIT, but if the value isn't
* legal, behave like <code>REVERT.
* <tr> | JFormattedTextField.PERSIST
* <td>Do nothing, don't obtain a new
* <code>AbstractFormatter, and don't update the value.
* </table>
* The default is <code>JFormattedTextField.COMMIT_OR_REVERT,
* refer to {@link #setFocusLostBehavior} for more information on this.
* <p>
* <code>JFormattedTextField allows the focus to leave, even if
* the currently edited value is invalid. To lock the focus down while the
* <code>JFormattedTextField is an invalid edit state
* you can attach an <code>InputVerifier. The following code snippet
* shows a potential implementation of such an <code>InputVerifier:
* <pre>
* public class FormattedTextFieldVerifier extends InputVerifier {
* public boolean verify(JComponent input) {
* if (input instanceof JFormattedTextField) {
* JFormattedTextField ftf = (JFormattedTextField)input;
* AbstractFormatter formatter = ftf.getFormatter();
* if (formatter != null) {
* String text = ftf.getText();
* try {
* formatter.stringToValue(text);
* return true;
* } catch (ParseException pe) {
* return false;
* }
* }
* }
* return true;
* }
* public boolean shouldYieldFocus(JComponent input) {
* return verify(input);
* }
* }
* </pre>
* <p>
* Alternatively, you could invoke <code>commitEdit, which would also
* commit the value.
* <p>
* <code>JFormattedTextField does not do the formatting it self,
* rather formatting is done through an instance of
* <code>JFormattedTextField.AbstractFormatter which is obtained from
* an instance of <code>JFormattedTextField.AbstractFormatterFactory.
* Instances of <code>JFormattedTextField.AbstractFormatter are
* notified when they become active by way of the
* <code>install method, at which point the
* <code>JFormattedTextField.AbstractFormatter can install whatever
* it needs to, typically a <code>DocumentFilter. Similarly when
* <code>JFormattedTextField no longer
* needs the <code>AbstractFormatter, it will invoke
* <code>uninstall.
* <p>
* <code>JFormattedTextField typically
* queries the <code>AbstractFormatterFactory for an
* <code>AbstractFormat when it gains or loses focus. Although this
* can change based on the focus lost policy. If the focus lost
* policy is <code>JFormattedTextField.PERSIST
* and the <code>JFormattedTextField has been edited, the
* <code>AbstractFormatterFactory will not be queried until the
* value has been committed. Similarly if the focus lost policy is
* <code>JFormattedTextField.COMMIT and an exception
* is thrown from <code>stringToValue, the
* <code>AbstractFormatterFactory will not be queried when focus is
* lost or gained.
* <p>
* <code>JFormattedTextField.AbstractFormatter
* is also responsible for determining when values are committed to
* the <code>JFormattedTextField. Some
* <code>JFormattedTextField.AbstractFormatters will make new values
* available on every edit, and others will never commit the value. You can
* force the current value to be obtained
* from the current <code>JFormattedTextField.AbstractFormatter
* by way of invoking <code>commitEdit. commitEdit will
* be invoked whenever return is pressed in the
* <code>JFormattedTextField.
* <p>
* If an <code>AbstractFormatterFactory has not been explicitly
* set, one will be set based on the <code>Class of the value type after
* <code>setValue has been invoked (assuming value is non-null).
* For example, in the following code an appropriate
* <code>AbstractFormatterFactory and AbstractFormatter
* will be created to handle formatting of numbers:
* <pre>
* JFormattedTextField tf = new JFormattedTextField();
* tf.setValue(new Number(100));
* </pre>
* <p>
* <strong>Warning: As the AbstractFormatter will
* typically install a <code>DocumentFilter on the
* <code>Document, and a NavigationFilter on the
* <code>JFormattedTextField you should not install your own. If you do,
* you are likely to see odd behavior in that the editing policy of the
* <code>AbstractFormatter will not be enforced.
* <p>
* <strong>Warning: Swing is not thread safe. For more
* information see <a
* href="package-summary.html#threading">Swing's Threading
* Policy</a>.
* <p>
* <strong>Warning:
* Serialized objects of this class will not be compatible with
* future Swing releases. The current serialization support is
* appropriate for short term storage or RMI between applications running
* the same version of Swing. As of 1.4, support for long term storage
* of all JavaBeans™
* has been added to the <code>java.beans package.
* Please see {@link java.beans.XMLEncoder}.
*
* @since 1.4
*/
public class JFormattedTextField extends JTextField {
private static final String uiClassID = "FormattedTextFieldUI";
private static final Action[] defaultActions =
{ new CommitAction(), new CancelAction() };
/**
* Constant identifying that when focus is lost,
* <code>commitEdit should be invoked. If in committing the
* new value a <code>ParseException is thrown, the invalid
* value will remain.
*
* @see #setFocusLostBehavior
*/
public static final int COMMIT = 0;
/**
* Constant identifying that when focus is lost,
* <code>commitEdit should be invoked. If in committing the new
* value a <code>ParseException is thrown, the value will be
* reverted.
*
* @see #setFocusLostBehavior
*/
public static final int COMMIT_OR_REVERT = 1;
/**
* Constant identifying that when focus is lost, editing value should
* be reverted to current value set on the
* <code>JFormattedTextField.
*
* @see #setFocusLostBehavior
*/
public static final int REVERT = 2;
/**
* Constant identifying that when focus is lost, the edited value
* should be left.
*
* @see #setFocusLostBehavior
*/
public static final int PERSIST = 3;
/**
* Factory used to obtain an instance of AbstractFormatter.
*/
private AbstractFormatterFactory factory;
/**
* Object responsible for formatting the current value.
*/
private AbstractFormatter format;
/**
* Last valid value.
*/
private Object value;
/**
* True while the value being edited is valid.
*/
private boolean editValid;
/**
* Behavior when focus is lost.
*/
private int focusLostBehavior;
/**
* Indicates the current value has been edited.
*/
private boolean edited;
/**
* Used to set the dirty state.
*/
private DocumentListener documentListener;
/**
* Masked used to set the AbstractFormatterFactory.
*/
private Object mask;
/**
* ActionMap that the TextFormatter Actions are added to.
*/
private ActionMap textFormatterActionMap;
/**
* Indicates the input method composed text is in the document
*/
private boolean composedTextExists = false;
/**
* A handler for FOCUS_LOST event
*/
private FocusLostHandler focusLostHandler;
/**
* Creates a <code>JFormattedTextField with no
* <code>AbstractFormatterFactory. Use setMask or
* <code>setFormatterFactory to configure the
* <code>JFormattedTextField to edit a particular type of
* value.
*/
public JFormattedTextField() {
super();
enableEvents(AWTEvent.FOCUS_EVENT_MASK);
setFocusLostBehavior(COMMIT_OR_REVERT);
}
/**
* Creates a JFormattedTextField with the specified value. This will
* create an <code>AbstractFormatterFactory based on the
* type of <code>value.
*
* @param value Initial value for the JFormattedTextField
*/
public JFormattedTextField(Object value) {
this();
setValue(value);
}
/**
* Creates a <code>JFormattedTextField. format is
* wrapped in an appropriate <code>AbstractFormatter which is
* then wrapped in an <code>AbstractFormatterFactory.
*
* @param format Format used to look up an AbstractFormatter
*/
public JFormattedTextField(java.text.Format format) {
this();
setFormatterFactory(getDefaultFormatterFactory(format));
}
/**
* Creates a <code>JFormattedTextField with the specified
* <code>AbstractFormatter. The AbstractFormatter
* is placed in an <code>AbstractFormatterFactory.
*
* @param formatter AbstractFormatter to use for formatting.
*/
public JFormattedTextField(AbstractFormatter formatter) {
this(new DefaultFormatterFactory(formatter));
}
/**
* Creates a <code>JFormattedTextField with the specified
* <code>AbstractFormatterFactory.
*
* @param factory AbstractFormatterFactory used for formatting.
*/
public JFormattedTextField(AbstractFormatterFactory factory) {
this();
setFormatterFactory(factory);
}
/**
* Creates a <code>JFormattedTextField with the specified
* <code>AbstractFormatterFactory and initial value.
*
* @param factory <code>AbstractFormatterFactory used for
* formatting.
* @param currentValue Initial value to use
*/
public JFormattedTextField(AbstractFormatterFactory factory,
Object currentValue) {
this(currentValue);
setFormatterFactory(factory);
}
/**
* Sets the behavior when focus is lost. This will be one of
* <code>JFormattedTextField.COMMIT_OR_REVERT,
* <code>JFormattedTextField.REVERT,
* <code>JFormattedTextField.COMMIT or
* <code>JFormattedTextField.PERSIST
* Note that some <code>AbstractFormatters may push changes as
* they occur, so that the value of this will have no effect.
* <p>
* This will throw an <code>IllegalArgumentException if the object
* passed in is not one of the afore mentioned values.
* <p>
* The default value of this property is
* <code>JFormattedTextField.COMMIT_OR_REVERT.
*
* @param behavior Identifies behavior when focus is lost
* @throws IllegalArgumentException if behavior is not one of the known
* values
* @beaninfo
* enum: COMMIT JFormattedTextField.COMMIT
* COMMIT_OR_REVERT JFormattedTextField.COMMIT_OR_REVERT
* REVERT JFormattedTextField.REVERT
* PERSIST JFormattedTextField.PERSIST
* description: Behavior when component loses focus
*/
public void setFocusLostBehavior(int behavior) {
if (behavior != COMMIT && behavior != COMMIT_OR_REVERT &&
behavior != PERSIST && behavior != REVERT) {
throw new IllegalArgumentException("setFocusLostBehavior must be one of: JFormattedTextField.COMMIT, JFormattedTextField.COMMIT_OR_REVERT, JFormattedTextField.PERSIST or JFormattedTextField.REVERT");
}
focusLostBehavior = behavior;
}
/**
* Returns the behavior when focus is lost. This will be one of
* <code>COMMIT_OR_REVERT,
* <code>COMMIT,
* <code>REVERT or
* <code>PERSIST
* Note that some <code>AbstractFormatters may push changes as
* they occur, so that the value of this will have no effect.
*
* @return returns behavior when focus is lost
*/
public int getFocusLostBehavior() {
return focusLostBehavior;
}
/**
* Sets the <code>AbstractFormatterFactory.
* <code>AbstractFormatterFactory is
* able to return an instance of <code>AbstractFormatter that is
* used to format a value for display, as well an enforcing an editing
* policy.
* <p>
* If you have not explicitly set an <code>AbstractFormatterFactory
* by way of this method (or a constructor) an
* <code>AbstractFormatterFactory and consequently an
* <code>AbstractFormatter will be used based on the
* <code>Class of the value. NumberFormatter will
* be used for <code>Numbers, DateFormatter will
* be used for <code>Dates, otherwise DefaultFormatter
* will be used.
* <p>
* This is a JavaBeans bound property.
*
* @param tf <code>AbstractFormatterFactory used to lookup
* instances of <code>AbstractFormatter
* @beaninfo
* bound: true
* attribute: visualUpdate true
* description: AbstractFormatterFactory, responsible for returning an
* AbstractFormatter that can format the current value.
*/
public void setFormatterFactory(AbstractFormatterFactory tf) {
AbstractFormatterFactory oldFactory = factory;
factory = tf;
firePropertyChange("formatterFactory", oldFactory, tf);
setValue(getValue(), true, false);
}
/**
* Returns the current <code>AbstractFormatterFactory.
*
* @see #setFormatterFactory
* @return <code>AbstractFormatterFactory used to determine
* <code>AbstractFormatters
*/
public AbstractFormatterFactory getFormatterFactory() {
return factory;
}
/**
* Sets the current <code>AbstractFormatter.
* <p>
* You should not normally invoke this, instead set the
* <code>AbstractFormatterFactory or set the value.
* <code>JFormattedTextField will
* invoke this as the state of the <code>JFormattedTextField
* changes and requires the value to be reset.
* <code>JFormattedTextField passes in the
* <code>AbstractFormatter obtained from the
* <code>AbstractFormatterFactory.
* <p>
* This is a JavaBeans bound property.
*
* @see #setFormatterFactory
* @param format AbstractFormatter to use for formatting
* @beaninfo
* bound: true
* attribute: visualUpdate true
* description: TextFormatter, responsible for formatting the current value
*/
protected void setFormatter(AbstractFormatter format) {
AbstractFormatter oldFormat = this.format;
if (oldFormat != null) {
oldFormat.uninstall();
}
setEditValid(true);
this.format = format;
if (format != null) {
format.install(this);
}
setEdited(false);
firePropertyChange("textFormatter", oldFormat, format);
}
/**
* Returns the <code>AbstractFormatter that is used to format and
* parse the current value.
*
* @return AbstractFormatter used for formatting
*/
public AbstractFormatter getFormatter() {
return format;
}
/**
* Sets the value that will be formatted by an
* <code>AbstractFormatter obtained from the current
* <code>AbstractFormatterFactory. If no
* <code>AbstractFormatterFactory has been specified, this will
* attempt to create one based on the type of <code>value.
* <p>
* The default value of this property is null.
* <p>
* This is a JavaBeans bound property.
*
* @param value Current value to display
* @beaninfo
* bound: true
* attribute: visualUpdate true
* description: The value to be formatted.
*/
public void setValue(Object value) {
if (value != null && getFormatterFactory() == null) {
setFormatterFactory(getDefaultFormatterFactory(value));
}
setValue(value, true, true);
}
/**
* Returns the last valid value. Based on the editing policy of
* the <code>AbstractFormatter this may not return the current
* value. The currently edited value can be obtained by invoking
* <code>commitEdit followed by getValue.
*
* @return Last valid value
*/
public Object getValue() {
return value;
}
/**
* Forces the current value to be taken from the
* <code>AbstractFormatter and set as the current value.
* This has no effect if there is no current
* <code>AbstractFormatter installed.
*
* @throws ParseException if the <code>AbstractFormatter is not able
* to format the current value
*/
public void commitEdit() throws ParseException {
AbstractFormatter format = getFormatter();
if (format != null) {
setValue(format.stringToValue(getText()), false, true);
}
}
/**
* Sets the validity of the edit on the receiver. You should not normally
* invoke this. This will be invoked by the
* <code>AbstractFormatter as the user edits the value.
* <p>
* Not all formatters will allow the component to get into an invalid
* state, and thus this may never be invoked.
* <p>
* Based on the look and feel this may visually change the state of
* the receiver.
*
* @param isValid boolean indicating if the currently edited value is
* valid.
* @beaninfo
* bound: true
* attribute: visualUpdate true
* description: True indicates the edited value is valid
*/
private void setEditValid(boolean isValid) {
if (isValid != editValid) {
editValid = isValid;
firePropertyChange("editValid", Boolean.valueOf(!isValid),
Boolean.valueOf(isValid));
}
}
/**
* Returns true if the current value being edited is valid. The value of
* this is managed by the current <code>AbstractFormatter, as such
* there is no public setter for it.
*
* @return true if the current value being edited is valid.
*/
public boolean isEditValid() {
return editValid;
}
/**
* Invoked when the user inputs an invalid value. This gives the
* component a chance to provide feedback. The default
* implementation beeps.
*/
protected void invalidEdit() {
UIManager.getLookAndFeel().provideErrorFeedback(JFormattedTextField.this);
}
/**
* Processes any input method events, such as
* <code>InputMethodEvent.INPUT_METHOD_TEXT_CHANGED or
* <code>InputMethodEvent.CARET_POSITION_CHANGED.
*
* @param e the <code>InputMethodEvent
* @see InputMethodEvent
*/
protected void processInputMethodEvent(InputMethodEvent e) {
AttributedCharacterIterator text = e.getText();
int commitCount = e.getCommittedCharacterCount();
// Keep track of the composed text
if (text != null) {
int begin = text.getBeginIndex();
int end = text.getEndIndex();
composedTextExists = ((end - begin) > commitCount);
} else {
composedTextExists = false;
}
super.processInputMethodEvent(e);
}
/**
* Processes any focus events, such as
* <code>FocusEvent.FOCUS_GAINED or
* <code>FocusEvent.FOCUS_LOST.
*
* @param e the <code>FocusEvent
* @see FocusEvent
*/
protected void processFocusEvent(FocusEvent e) {
super.processFocusEvent(e);
// ignore temporary focus event
if (e.isTemporary()) {
return;
}
if (isEdited() && e.getID() == FocusEvent.FOCUS_LOST) {
InputContext ic = getInputContext();
if (focusLostHandler == null) {
focusLostHandler = new FocusLostHandler();
}
// if there is a composed text, process it first
if ((ic != null) && composedTextExists) {
ic.endComposition();
EventQueue.invokeLater(focusLostHandler);
} else {
focusLostHandler.run();
}
}
else if (!isEdited()) {
// reformat
setValue(getValue(), true, true);
}
}
/**
* FOCUS_LOST behavior implementation
*/
private class FocusLostHandler implements Runnable, Serializable {
public void run() {
int fb = JFormattedTextField.this.getFocusLostBehavior();
if (fb == JFormattedTextField.COMMIT ||
fb == JFormattedTextField.COMMIT_OR_REVERT) {
try {
JFormattedTextField.this.commitEdit();
// Give it a chance to reformat.
JFormattedTextField.this.setValue(
JFormattedTextField.this.getValue(), true, true);
} catch (ParseException pe) {
if (fb == JFormattedTextField.this.COMMIT_OR_REVERT) {
JFormattedTextField.this.setValue(
JFormattedTextField.this.getValue(), true, true);
}
}
}
else if (fb == JFormattedTextField.REVERT) {
JFormattedTextField.this.setValue(
JFormattedTextField.this.getValue(), true, true);
}
}
}
/**
* Fetches the command list for the editor. This is
* the list of commands supported by the plugged-in UI
* augmented by the collection of commands that the
* editor itself supports. These are useful for binding
* to events, such as in a keymap.
*
* @return the command list
*/
public Action[] getActions() {
return TextAction.augmentList(super.getActions(), defaultActions);
}
/**
* Gets the class ID for a UI.
*
* @return the string "FormattedTextFieldUI"
* @see JComponent#getUIClassID
*/
public String getUIClassID() {
return uiClassID;
}
/**
* Associates the editor with a text document.
* The currently registered factory is used to build a view for
* the document, which gets displayed by the editor after revalidation.
* A PropertyChange event ("document") is propagated to each listener.
*
* @param doc the document to display/edit
* @see #getDocument
* @beaninfo
* description: the text document model
* bound: true
* expert: true
*/
public void setDocument(Document doc) {
if (documentListener != null && getDocument() != null) {
getDocument().removeDocumentListener(documentListener);
}
super.setDocument(doc);
if (documentListener == null) {
documentListener = new DocumentHandler();
}
doc.addDocumentListener(documentListener);
}
/*
* See readObject and writeObject in JComponent for more
* information about serialization in Swing.
*
* @param s Stream to write to
*/
private void writeObject(ObjectOutputStream s) throws IOException {
s.defaultWriteObject();
if (getUIClassID().equals(uiClassID)) {
byte count = JComponent.getWriteObjCounter(this);
JComponent.setWriteObjCounter(this, --count);
if (count == 0 && ui != null) {
ui.installUI(this);
}
}
}
/**
* Resets the Actions that come from the TextFormatter to
* <code>actions.
*/
private void setFormatterActions(Action[] actions) {
if (actions == null) {
if (textFormatterActionMap != null) {
textFormatterActionMap.clear();
}
}
else {
if (textFormatterActionMap == null) {
ActionMap map = getActionMap();
textFormatterActionMap = new ActionMap();
while (map != null) {
ActionMap parent = map.getParent();
if (parent instanceof UIResource || parent == null) {
map.setParent(textFormatterActionMap);
textFormatterActionMap.setParent(parent);
break;
}
map = parent;
}
}
for (int counter = actions.length - 1; counter >= 0;
counter--) {
Object key = actions[counter].getValue(Action.NAME);
if (key != null) {
textFormatterActionMap.put(key, actions[counter]);
}
}
}
}
/**
* Does the setting of the value. If <code>createFormat is true,
* this will also obtain a new <code>AbstractFormatter from the
* current factory. The property change event will be fired if
* <code>firePC is true.
*/
private void setValue(Object value, boolean createFormat, boolean firePC) {
Object oldValue = this.value;
this.value = value;
if (createFormat) {
AbstractFormatterFactory factory = getFormatterFactory();
AbstractFormatter atf;
if (factory != null) {
atf = factory.getFormatter(this);
}
else {
atf = null;
}
setFormatter(atf);
}
else {
// Assumed to be valid
setEditValid(true);
}
setEdited(false);
if (firePC) {
firePropertyChange("value", oldValue, value);
}
}
/**
* Sets the edited state of the receiver.
*/
private void setEdited(boolean edited) {
this.edited = edited;
}
/**
* Returns true if the receiver has been edited.
*/
private boolean isEdited() {
return edited;
}
/**
* Returns an AbstractFormatterFactory suitable for the passed in
* Object type.
*/
private AbstractFormatterFactory getDefaultFormatterFactory(Object type) {
if (type instanceof DateFormat) {
return new DefaultFormatterFactory(new DateFormatter
((DateFormat)type));
}
if (type instanceof NumberFormat) {
return new DefaultFormatterFactory(new NumberFormatter(
(NumberFormat)type));
}
if (type instanceof Format) {
return new DefaultFormatterFactory(new InternationalFormatter(
(Format)type));
}
if (type instanceof Date) {
return new DefaultFormatterFactory(new DateFormatter());
}
if (type instanceof Number) {
AbstractFormatter displayFormatter = new NumberFormatter();
((NumberFormatter)displayFormatter).setValueClass(type.getClass());
AbstractFormatter editFormatter = new NumberFormatter(
new DecimalFormat("#.#"));
((NumberFormatter)editFormatter).setValueClass(type.getClass());
return new DefaultFormatterFactory(displayFormatter,
displayFormatter,editFormatter);
}
return new DefaultFormatterFactory(new DefaultFormatter());
}
/**
* Instances of <code>AbstractFormatterFactory are used by
* <code>JFormattedTextField to obtain instances of
* <code>AbstractFormatter which in turn are used to format values.
* <code>AbstractFormatterFactory can return different
* <code>AbstractFormatters based on the state of the
* <code>JFormattedTextField, perhaps returning different
* <code>AbstractFormatters when the
* <code>JFormattedTextField has focus vs when it
* doesn't have focus.
* @since 1.4
*/
public static abstract class AbstractFormatterFactory {
/**
* Returns an <code>AbstractFormatter that can handle formatting
* of the passed in <code>JFormattedTextField.
*
* @param tf JFormattedTextField requesting AbstractFormatter
* @return AbstractFormatter to handle formatting duties, a null
* return value implies the JFormattedTextField should behave
* like a normal JTextField
*/
public abstract AbstractFormatter getFormatter(JFormattedTextField tf);
}
/**
* Instances of <code>AbstractFormatter are used by
* <code>JFormattedTextField to handle the conversion both
* from an Object to a String, and back from a String to an Object.
* <code>AbstractFormatters can also enforce editing policies,
* or navigation policies, or manipulate the
* <code>JFormattedTextField in any way it sees fit to
* enforce the desired policy.
* <p>
* An <code>AbstractFormatter can only be active in
* one <code>JFormattedTextField at a time.
* <code>JFormattedTextField invokes
* <code>install when it is ready to use it followed
* by <code>uninstall when done. Subclasses
* that wish to install additional state should override
* <code>install and message super appropriately.
* <p>
* Subclasses must override the conversion methods
* <code>stringToValue and valueToString. Optionally
* they can override <code>getActions,
* <code>getNavigationFilter and getDocumentFilter
* to restrict the <code>JFormattedTextField in a particular
* way.
* <p>
* Subclasses that allow the <code>JFormattedTextField to be in
* a temporarily invalid state should invoke <code>setEditValid
* at the appropriate times.
* @since 1.4
*/
public static abstract class AbstractFormatter implements Serializable {
private JFormattedTextField ftf;
/**
* Installs the <code>AbstractFormatter onto a particular
* <code>JFormattedTextField.
* This will invoke <code>valueToString to convert the
* current value from the <code>JFormattedTextField to
* a String. This will then install the <code>Actions from
* <code>getActions, the DocumentFilter
* returned from <code>getDocumentFilter and the
* <code>NavigationFilter returned from
* <code>getNavigationFilter onto the
* <code>JFormattedTextField.
* <p>
* Subclasses will typically only need to override this if they
* wish to install additional listeners on the
* <code>JFormattedTextField.
* <p>
* If there is a <code>ParseException in converting the
* current value to a String, this will set the text to an empty
* String, and mark the <code>JFormattedTextField as being
* in an invalid state.
* <p>
* While this is a public method, this is typically only useful
* for subclassers of <code>JFormattedTextField.
* <code>JFormattedTextField will invoke this method at
* the appropriate times when the value changes, or its internal
* state changes. You will only need to invoke this yourself if
* you are subclassing <code>JFormattedTextField and
* installing/uninstalling <code>AbstractFormatter at a
* different time than <code>JFormattedTextField does.
*
* @param ftf JFormattedTextField to format for, may be null indicating
* uninstall from current JFormattedTextField.
*/
public void install(JFormattedTextField ftf) {
if (this.ftf != null) {
uninstall();
}
this.ftf = ftf;
if (ftf != null) {
try {
ftf.setText(valueToString(ftf.getValue()));
} catch (ParseException pe) {
ftf.setText("");
setEditValid(false);
}
installDocumentFilter(getDocumentFilter());
ftf.setNavigationFilter(getNavigationFilter());
ftf.setFormatterActions(getActions());
}
}
/**
* Uninstalls any state the <code>AbstractFormatter may have
* installed on the <code>JFormattedTextField. This resets the
* <code>DocumentFilter, NavigationFilter
* and additional <code>Actions installed on the
* <code>JFormattedTextField.
*/
public void uninstall() {
if (this.ftf != null) {
installDocumentFilter(null);
this.ftf.setNavigationFilter(null);
this.ftf.setFormatterActions(null);
}
}
/**
* Parses <code>text returning an arbitrary Object. Some
* formatters may return null.
*
* @throws ParseException if there is an error in the conversion
* @param text String to convert
* @return Object representation of text
*/
public abstract Object stringToValue(String text) throws
ParseException;
/**
* Returns the string value to display for <code>value.
*
* @throws ParseException if there is an error in the conversion
* @param value Value to convert
* @return String representation of value
*/
public abstract String valueToString(Object value) throws
ParseException;
/**
* Returns the current <code>JFormattedTextField the
* <code>AbstractFormatter is installed on.
*
* @return JFormattedTextField formatting for.
*/
protected JFormattedTextField getFormattedTextField() {
return ftf;
}
/**
* This should be invoked when the user types an invalid character.
* This forwards the call to the current JFormattedTextField.
*/
protected void invalidEdit() {
JFormattedTextField ftf = getFormattedTextField();
if (ftf != null) {
ftf.invalidEdit();
}
}
/**
* Invoke this to update the <code>editValid property of the
* <code>JFormattedTextField. If you an enforce a policy
* such that the <code>JFormattedTextField is always in a
* valid state, you will never need to invoke this.
*
* @param valid Valid state of the JFormattedTextField
*/
protected void setEditValid(boolean valid) {
JFormattedTextField ftf = getFormattedTextField();
if (ftf != null) {
ftf.setEditValid(valid);
}
}
/**
* Subclass and override if you wish to provide a custom set of
* <code>Actions. install will install these
* on the <code>JFormattedTextField's ActionMap.
*
* @return Array of Actions to install on JFormattedTextField
*/
protected Action[] getActions() {
return null;
}
/**
* Subclass and override if you wish to provide a
* <code>DocumentFilter to restrict what can be input.
* <code>install will install the returned value onto
* the <code>JFormattedTextField.
*
* @return DocumentFilter to restrict edits
*/
protected DocumentFilter getDocumentFilter() {
return null;
}
/**
* Subclass and override if you wish to provide a filter to restrict
* where the user can navigate to.
* <code>install will install the returned value onto
* the <code>JFormattedTextField.
*
* @return NavigationFilter to restrict navigation
*/
protected NavigationFilter getNavigationFilter() {
return null;
}
/**
* Clones the <code>AbstractFormatter. The returned instance
* is not associated with a <code>JFormattedTextField.
*
* @return Copy of the AbstractFormatter
*/
protected Object clone() throws CloneNotSupportedException {
AbstractFormatter formatter = (AbstractFormatter)super.clone();
formatter.ftf = null;
return formatter;
}
/**
* Installs the <code>DocumentFilter filter
* onto the current <code>JFormattedTextField.
*
* @param filter DocumentFilter to install on the Document.
*/
private void installDocumentFilter(DocumentFilter filter) {
JFormattedTextField ftf = getFormattedTextField();
if (ftf != null) {
Document doc = ftf.getDocument();
if (doc instanceof AbstractDocument) {
((AbstractDocument)doc).setDocumentFilter(filter);
}
doc.putProperty(DocumentFilter.class, null);
}
}
}
/**
* Used to commit the edit. This extends JTextField.NotifyAction
* so that <code>isEnabled is true while a JFormattedTextField
* has focus, and extends <code>actionPerformed to invoke
* commitEdit.
*/
static class CommitAction extends JTextField.NotifyAction {
public void actionPerformed(ActionEvent e) {
JTextComponent target = getFocusedComponent();
if (target instanceof JFormattedTextField) {
// Attempt to commit the value
try {
((JFormattedTextField)target).commitEdit();
} catch (ParseException pe) {
((JFormattedTextField)target).invalidEdit();
// value not committed, don't notify ActionListeners
return;
}
}
// Super behavior.
super.actionPerformed(e);
}
public boolean isEnabled() {
JTextComponent target = getFocusedComponent();
if (target instanceof JFormattedTextField) {
JFormattedTextField ftf = (JFormattedTextField)target;
if (!ftf.isEdited()) {
return false;
}
return true;
}
return super.isEnabled();
}
}
/**
* CancelAction will reset the value in the JFormattedTextField when
* <code>actionPerformed is invoked. It will only be
* enabled if the focused component is an instance of
* JFormattedTextField.
*/
private static class CancelAction extends TextAction {
public CancelAction() {
super("reset-field-edit");
}
public void actionPerformed(ActionEvent e) {
JTextComponent target = getFocusedComponent();
if (target instanceof JFormattedTextField) {
JFormattedTextField ftf = (JFormattedTextField)target;
ftf.setValue(ftf.getValue());
}
}
public boolean isEnabled() {
JTextComponent target = getFocusedComponent();
if (target instanceof JFormattedTextField) {
JFormattedTextField ftf = (JFormattedTextField)target;
if (!ftf.isEdited()) {
return false;
}
return true;
}
return super.isEnabled();
}
}
/**
* Sets the dirty state as the document changes.
*/
private class DocumentHandler implements DocumentListener, Serializable {
public void insertUpdate(DocumentEvent e) {
setEdited(true);
}
public void removeUpdate(DocumentEvent e) {
setEdited(true);
}
public void changedUpdate(DocumentEvent e) {}
}
}
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