JDK8/Java8源码在线阅读
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* accompanied this code).
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package javax.swing;
import sun.swing.SwingUtilities2;
import java.awt.*;
import java.awt.event.*;
import java.beans.*;
import javax.swing.text.*;
import javax.swing.plaf.*;
import javax.swing.event.*;
import javax.accessibility.*;
import java.io.ObjectOutputStream;
import java.io.ObjectInputStream;
import java.io.IOException;
import java.io.Serializable;
/**
* <code>JTextField</code> is a lightweight component that allows the editing
* of a single line of text.
* For information on and examples of using text fields,
* see
* <a href="https://docs.oracle.com/javase/tutorial/uiswing/components/textfield.html">How to Use Text Fields</a>
* in <em>The Java Tutorial.</em>
*
* <p>
* <code>JTextField</code> is intended to be source-compatible
* with <code>java.awt.TextField</code> where it is reasonable to do so. This
* component has capabilities not found in the <code>java.awt.TextField</code>
* class. The superclass should be consulted for additional capabilities.
* <p>
* <code>JTextField</code> has a method to establish the string used as the
* command string for the action event that gets fired. The
* <code>java.awt.TextField</code> used the text of the field as the command
* string for the <code>ActionEvent</code>.
* <code>JTextField</code> will use the command
* string set with the <code>setActionCommand</code> method if not <code>null</code>,
* otherwise it will use the text of the field as a compatibility with
* <code>java.awt.TextField</code>.
* <p>
* The method <code>setEchoChar</code> and <code>getEchoChar</code>
* are not provided directly to avoid a new implementation of a
* pluggable look-and-feel inadvertently exposing password characters.
* To provide password-like services a separate class <code>JPasswordField</code>
* extends <code>JTextField</code> to provide this service with an independently
* pluggable look-and-feel.
* <p>
* The <code>java.awt.TextField</code> could be monitored for changes by adding
* a <code>TextListener</code> for <code>TextEvent</code>'s.
* In the <code>JTextComponent</code> based
* components, changes are broadcasted from the model via a
* <code>DocumentEvent</code> to <code>DocumentListeners</code>.
* The <code>DocumentEvent</code> gives
* the location of the change and the kind of change if desired.
* The code fragment might look something like:
* <pre><code>
* DocumentListener myListener = ??;
* JTextField myArea = ??;
* myArea.getDocument().addDocumentListener(myListener);
* </code></pre>
* <p>
* The horizontal alignment of <code>JTextField</code> can be set to be left
* justified, leading justified, centered, right justified or trailing justified.
* Right/trailing justification is useful if the required size
* of the field text is smaller than the size allocated to it.
* This is determined by the <code>setHorizontalAlignment</code>
* and <code>getHorizontalAlignment</code> methods. The default
* is to be leading justified.
* <p>
* How the text field consumes VK_ENTER events depends
* on whether the text field has any action listeners.
* If so, then VK_ENTER results in the listeners
* getting an ActionEvent,
* and the VK_ENTER event is consumed.
* This is compatible with how AWT text fields handle VK_ENTER events.
* If the text field has no action listeners, then as of v 1.3 the VK_ENTER
* event is not consumed. Instead, the bindings of ancestor components
* are processed, which enables the default button feature of
* JFC/Swing to work.
* <p>
* Customized fields can easily be created by extending the model and
* changing the default model provided. For example, the following piece
* of code will create a field that holds only upper case characters. It
* will work even if text is pasted into from the clipboard or it is altered via
* programmatic changes.
* <pre><code>
public class UpperCaseField extends JTextField {
public UpperCaseField(int cols) {
super(cols);
}
protected Document createDefaultModel() {
return new UpperCaseDocument();
}
static class UpperCaseDocument extends PlainDocument {
public void insertString(int offs, String str, AttributeSet a)
throws BadLocationException {
if (str == null) {
return;
}
char[] upper = str.toCharArray();
for (int i = 0; i < upper.length; i++) {
upper[i] = Character.toUpperCase(upper[i]);
}
super.insertString(offs, new String(upper), a);
}
}
}
* </code></pre>
* <p>
* <strong>Warning:</strong> Swing is not thread safe. For more
* information see <a
* href="package-summary.html#threading">Swing's Threading
* Policy</a>.
* <p>
* <strong>Warning:</strong>
* 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</code> package.
* Please see {@link java.beans.XMLEncoder}.
*
* @beaninfo
* attribute: isContainer false
* description: A component which allows for the editing of a single line of text.
*
* @author Timothy Prinzing
* @see #setActionCommand
* @see JPasswordField
* @see #addActionListener
*/
public class JTextField extends JTextComponent implements SwingConstants {
/**
* Constructs a new <code>TextField</code>. A default model is created,
* the initial string is <code>null</code>,
* and the number of columns is set to 0.
*/
public JTextField() {
this(null, null, 0);
}
/**
* Constructs a new <code>TextField</code> initialized with the
* specified text. A default model is created and the number of
* columns is 0.
*
* @param text the text to be displayed, or <code>null</code>
*/
public JTextField(String text) {
this(null, text, 0);
}
/**
* Constructs a new empty <code>TextField</code> with the specified
* number of columns.
* A default model is created and the initial string is set to
* <code>null</code>.
*
* @param columns the number of columns to use to calculate
* the preferred width; if columns is set to zero, the
* preferred width will be whatever naturally results from
* the component implementation
*/
public JTextField(int columns) {
this(null, null, columns);
}
/**
* Constructs a new <code>TextField</code> initialized with the
* specified text and columns. A default model is created.
*
* @param text the text to be displayed, or <code>null</code>
* @param columns the number of columns to use to calculate
* the preferred width; if columns is set to zero, the
* preferred width will be whatever naturally results from
* the component implementation
*/
public JTextField(String text, int columns) {
this(null, text, columns);
}
/**
* Constructs a new <code>JTextField</code> that uses the given text
* storage model and the given number of columns.
* This is the constructor through which the other constructors feed.
* If the document is <code>null</code>, a default model is created.
*
* @param doc the text storage to use; if this is <code>null</code>,
* a default will be provided by calling the
* <code>createDefaultModel</code> method
* @param text the initial string to display, or <code>null</code>
* @param columns the number of columns to use to calculate
* the preferred width >= 0; if <code>columns</code>
* is set to zero, the preferred width will be whatever
* naturally results from the component implementation
* @exception IllegalArgumentException if <code>columns</code> < 0
*/
public JTextField(Document doc, String text, int columns) {
if (columns < 0) {
throw new IllegalArgumentException("columns less than zero.");
}
visibility = new DefaultBoundedRangeModel();
visibility.addChangeListener(new ScrollRepainter());
this.columns = columns;
if (doc == null) {
doc = createDefaultModel();
}
setDocument(doc);
if (text != null) {
setText(text);
}
}
/**
* Gets the class ID for a UI.
*
* @return the string "TextFieldUI"
* @see JComponent#getUIClassID
* @see UIDefaults#getUI
*/
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 (doc != null) {
doc.putProperty("filterNewlines", Boolean.TRUE);
}
super.setDocument(doc);
}
/**
* Calls to <code>revalidate</code> that come from within the
* textfield itself will
* be handled by validating the textfield, unless the textfield
* is contained within a <code>JViewport</code>,
* in which case this returns false.
*
* @return if the parent of this textfield is a <code>JViewPort</code>
* return false, otherwise return true
*
* @see JComponent#revalidate
* @see JComponent#isValidateRoot
* @see java.awt.Container#isValidateRoot
*/
@Override
public boolean isValidateRoot() {
return !(SwingUtilities.getUnwrappedParent(this) instanceof JViewport);
}
/**
* Returns the horizontal alignment of the text.
* Valid keys are:
* <ul>
* <li><code>JTextField.LEFT</code>
* <li><code>JTextField.CENTER</code>
* <li><code>JTextField.RIGHT</code>
* <li><code>JTextField.LEADING</code>
* <li><code>JTextField.TRAILING</code>
* </ul>
*
* @return the horizontal alignment
*/
public int getHorizontalAlignment() {
return horizontalAlignment;
}
/**
* Sets the horizontal alignment of the text.
* Valid keys are:
* <ul>
* <li><code>JTextField.LEFT</code>
* <li><code>JTextField.CENTER</code>
* <li><code>JTextField.RIGHT</code>
* <li><code>JTextField.LEADING</code>
* <li><code>JTextField.TRAILING</code>
* </ul>
* <code>invalidate</code> and <code>repaint</code> are called when the
* alignment is set,
* and a <code>PropertyChange</code> event ("horizontalAlignment") is fired.
*
* @param alignment the alignment
* @exception IllegalArgumentException if <code>alignment</code>
* is not a valid key
* @beaninfo
* preferred: true
* bound: true
* description: Set the field alignment to LEFT, CENTER, RIGHT,
* LEADING (the default) or TRAILING
* enum: LEFT JTextField.LEFT CENTER JTextField.CENTER RIGHT JTextField.RIGHT
* LEADING JTextField.LEADING TRAILING JTextField.TRAILING
*/
public void setHorizontalAlignment(int alignment) {
if (alignment == horizontalAlignment) return;
int oldValue = horizontalAlignment;
if ((alignment == LEFT) || (alignment == CENTER) ||
(alignment == RIGHT)|| (alignment == LEADING) ||
(alignment == TRAILING)) {
horizontalAlignment = alignment;
} else {
throw new IllegalArgumentException("horizontalAlignment");
}
firePropertyChange("horizontalAlignment", oldValue, horizontalAlignment);
invalidate();
repaint();
}
/**
* Creates the default implementation of the model
* to be used at construction if one isn't explicitly
* given. An instance of <code>PlainDocument</code> is returned.
*
* @return the default model implementation
*/
protected Document createDefaultModel() {
return new PlainDocument();
}
/**
* Returns the number of columns in this <code>TextField</code>.
*
* @return the number of columns >= 0
*/
public int getColumns() {
return columns;
}
/**
* Sets the number of columns in this <code>TextField</code>,
* and then invalidate the layout.
*
* @param columns the number of columns >= 0
* @exception IllegalArgumentException if <code>columns</code>
* is less than 0
* @beaninfo
* description: the number of columns preferred for display
*/
public void setColumns(int columns) {
int oldVal = this.columns;
if (columns < 0) {
throw new IllegalArgumentException("columns less than zero.");
}
if (columns != oldVal) {
this.columns = columns;
invalidate();
}
}
/**
* Returns the column width.
* The meaning of what a column is can be considered a fairly weak
* notion for some fonts. This method is used to define the width
* of a column. By default this is defined to be the width of the
* character <em>m</em> for the font used. This method can be
* redefined to be some alternative amount
*
* @return the column width >= 1
*/
protected int getColumnWidth() {
if (columnWidth == 0) {
FontMetrics metrics = getFontMetrics(getFont());
columnWidth = metrics.charWidth('m');
}
return columnWidth;
}
/**
* Returns the preferred size <code>Dimensions</code> needed for this
* <code>TextField</code>. If a non-zero number of columns has been
* set, the width is set to the columns multiplied by
* the column width.
*
* @return the dimension of this textfield
*/
public Dimension getPreferredSize() {
Dimension size = super.getPreferredSize();
if (columns != 0) {
Insets insets = getInsets();
size.width = columns * getColumnWidth() +
insets.left + insets.right;
}
return size;
}
/**
* Sets the current font. This removes cached row height and column
* width so the new font will be reflected.
* <code>revalidate</code> is called after setting the font.
*
* @param f the new font
*/
public void setFont(Font f) {
super.setFont(f);
columnWidth = 0;
}
/**
* Adds the specified action listener to receive
* action events from this textfield.
*
* @param l the action listener to be added
*/
public synchronized void addActionListener(ActionListener l) {
listenerList.add(ActionListener.class, l);
}
/**
* Removes the specified action listener so that it no longer
* receives action events from this textfield.
*
* @param l the action listener to be removed
*/
public synchronized void removeActionListener(ActionListener l) {
if ((l != null) && (getAction() == l)) {
setAction(null);
} else {
listenerList.remove(ActionListener.class, l);
}
}
/**
* Returns an array of all the <code>ActionListener</code>s added
* to this JTextField with addActionListener().
*
* @return all of the <code>ActionListener</code>s added or an empty
* array if no listeners have been added
* @since 1.4
*/
public synchronized ActionListener[] getActionListeners() {
return listenerList.getListeners(ActionListener.class);
}
/**
* Notifies all listeners that have registered interest for
* notification on this event type. The event instance
* is lazily created.
* The listener list is processed in last to
* first order.
* @see EventListenerList
*/
protected void fireActionPerformed() {
// Guaranteed to return a non-null array
Object[] listeners = listenerList.getListenerList();
int modifiers = 0;
AWTEvent currentEvent = EventQueue.getCurrentEvent();
if (currentEvent instanceof InputEvent) {
modifiers = ((InputEvent)currentEvent).getModifiers();
} else if (currentEvent instanceof ActionEvent) {
modifiers = ((ActionEvent)currentEvent).getModifiers();
}
ActionEvent e =
new ActionEvent(this, ActionEvent.ACTION_PERFORMED,
(command != null) ? command : getText(),
EventQueue.getMostRecentEventTime(), modifiers);
// Process the listeners last to first, notifying
// those that are interested in this event
for (int i = listeners.length-2; i>=0; i-=2) {
if (listeners[i]==ActionListener.class) {
((ActionListener)listeners[i+1]).actionPerformed(e);
}
}
}
/**
* Sets the command string used for action events.
*
* @param command the command string
*/
public void setActionCommand(String command) {
this.command = command;
}
private Action action;
private PropertyChangeListener actionPropertyChangeListener;
/**
* Sets the <code>Action</code> for the <code>ActionEvent</code> source.
* The new <code>Action</code> replaces
* any previously set <code>Action</code> but does not affect
* <code>ActionListeners</code> independently
* added with <code>addActionListener</code>.
* If the <code>Action</code> is already a registered
* <code>ActionListener</code>
* for the <code>ActionEvent</code> source, it is not re-registered.
* <p>
* Setting the <code>Action</code> results in immediately changing
* all the properties described in <a href="Action.html#buttonActions">
* Swing Components Supporting <code>Action</code></a>.
* Subsequently, the textfield's properties are automatically updated
* as the <code>Action</code>'s properties change.
* <p>
* This method uses three other methods to set
* and help track the <code>Action</code>'s property values.
* It uses the <code>configurePropertiesFromAction</code> method
* to immediately change the textfield's properties.
* To track changes in the <code>Action</code>'s property values,
* this method registers the <code>PropertyChangeListener</code>
* returned by <code>createActionPropertyChangeListener</code>. The
* default {@code PropertyChangeListener} invokes the
* {@code actionPropertyChanged} method when a property in the
* {@code Action} changes.
*
* @param a the <code>Action</code> for the <code>JTextField</code>,
* or <code>null</code>
* @since 1.3
* @see Action
* @see #getAction
* @see #configurePropertiesFromAction
* @see #createActionPropertyChangeListener
* @see #actionPropertyChanged
* @beaninfo
* bound: true
* attribute: visualUpdate true
* description: the Action instance connected with this ActionEvent source
*/
public void setAction(Action a) {
Action oldValue = getAction();
if (action==null || !action.equals(a)) {
action = a;
if (oldValue!=null) {
removeActionListener(oldValue);
oldValue.removePropertyChangeListener(actionPropertyChangeListener);
actionPropertyChangeListener = null;
}
configurePropertiesFromAction(action);
if (action!=null) {
// Don't add if it is already a listener
if (!isListener(ActionListener.class, action)) {
addActionListener(action);
}
// Reverse linkage:
actionPropertyChangeListener = createActionPropertyChangeListener(action);
action.addPropertyChangeListener(actionPropertyChangeListener);
}
firePropertyChange("action", oldValue, action);
}
}
private boolean isListener(Class c, ActionListener a) {
boolean isListener = false;
Object[] listeners = listenerList.getListenerList();
for (int i = listeners.length-2; i>=0; i-=2) {
if (listeners[i]==c && listeners[i+1]==a) {
isListener=true;
}
}
return isListener;
}
/**
* Returns the currently set <code>Action</code> for this
* <code>ActionEvent</code> source, or <code>null</code>
* if no <code>Action</code> is set.
*
* @return the <code>Action</code> for this <code>ActionEvent</code> source,
* or <code>null</code>
* @since 1.3
* @see Action
* @see #setAction
*/
public Action getAction() {
return action;
}
/**
* Sets the properties on this textfield to match those in the specified
* <code>Action</code>. Refer to <a href="Action.html#buttonActions">
* Swing Components Supporting <code>Action</code></a> for more
* details as to which properties this sets.
*
* @param a the <code>Action</code> from which to get the properties,
* or <code>null</code>
* @since 1.3
* @see Action
* @see #setAction
*/
protected void configurePropertiesFromAction(Action a) {
AbstractAction.setEnabledFromAction(this, a);
AbstractAction.setToolTipTextFromAction(this, a);
setActionCommandFromAction(a);
}
/**
* Updates the textfield's state in response to property changes in
* associated action. This method is invoked from the
* {@code PropertyChangeListener} returned from
* {@code createActionPropertyChangeListener}. Subclasses do not normally
* need to invoke this. Subclasses that support additional {@code Action}
* properties should override this and
* {@code configurePropertiesFromAction}.
* <p>
* Refer to the table at <a href="Action.html#buttonActions">
* Swing Components Supporting <code>Action</code></a> for a list of
* the properties this method sets.
*
* @param action the <code>Action</code> associated with this textfield
* @param propertyName the name of the property that changed
* @since 1.6
* @see Action
* @see #configurePropertiesFromAction
*/
protected void actionPropertyChanged(Action action, String propertyName) {
if (propertyName == Action.ACTION_COMMAND_KEY) {
setActionCommandFromAction(action);
} else if (propertyName == "enabled") {
AbstractAction.setEnabledFromAction(this, action);
} else if (propertyName == Action.SHORT_DESCRIPTION) {
AbstractAction.setToolTipTextFromAction(this, action);
}
}
private void setActionCommandFromAction(Action action) {
setActionCommand((action == null) ? null :
(String)action.getValue(Action.ACTION_COMMAND_KEY));
}
/**
* Creates and returns a <code>PropertyChangeListener</code> that is
* responsible for listening for changes from the specified
* <code>Action</code> and updating the appropriate properties.
* <p>
* <b>Warning:</b> If you subclass this do not create an anonymous
* inner class. If you do the lifetime of the textfield will be tied to
* that of the <code>Action</code>.
*
* @param a the textfield's action
* @since 1.3
* @see Action
* @see #setAction
*/
protected PropertyChangeListener createActionPropertyChangeListener(Action a) {
return new TextFieldActionPropertyChangeListener(this, a);
}
private static class TextFieldActionPropertyChangeListener extends
ActionPropertyChangeListener<JTextField> {
TextFieldActionPropertyChangeListener(JTextField tf, Action a) {
super(tf, a);
}
protected void actionPropertyChanged(JTextField textField,
Action action,
PropertyChangeEvent e) {
if (AbstractAction.shouldReconfigure(e)) {
textField.configurePropertiesFromAction(action);
} else {
textField.actionPropertyChanged(action, e.getPropertyName());
}
}
}
/**
* 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);
}
/**
* Processes action events occurring on this textfield by
* dispatching them to any registered <code>ActionListener</code> objects.
* This is normally called by the controller registered with
* textfield.
*/
public void postActionEvent() {
fireActionPerformed();
}
// --- Scrolling support -----------------------------------
/**
* Gets the visibility of the text field. This can
* be adjusted to change the location of the visible
* area if the size of the field is greater than
* the area that was allocated to the field.
*
* <p>
* The fields look-and-feel implementation manages
* the values of the minimum, maximum, and extent
* properties on the <code>BoundedRangeModel</code>.
*
* @return the visibility
* @see BoundedRangeModel
*/
public BoundedRangeModel getHorizontalVisibility() {
return visibility;
}
/**
* Gets the scroll offset, in pixels.
*
* @return the offset >= 0
*/
public int getScrollOffset() {
return visibility.getValue();
}
/**
* Sets the scroll offset, in pixels.
*
* @param scrollOffset the offset >= 0
*/
public void setScrollOffset(int scrollOffset) {
visibility.setValue(scrollOffset);
}
/**
* Scrolls the field left or right.
*
* @param r the region to scroll
*/
public void scrollRectToVisible(Rectangle r) {
// convert to coordinate system of the bounded range
Insets i = getInsets();
int x0 = r.x + visibility.getValue() - i.left;
int x1 = x0 + r.width;
if (x0 < visibility.getValue()) {
// Scroll to the left
visibility.setValue(x0);
} else if(x1 > visibility.getValue() + visibility.getExtent()) {
// Scroll to the right
visibility.setValue(x1 - visibility.getExtent());
}
}
/**
* Returns true if the receiver has an <code>ActionListener</code>
* installed.
*/
boolean hasActionListener() {
// Guaranteed to return a non-null array
Object[] listeners = listenerList.getListenerList();
// Process the listeners last to first, notifying
// those that are interested in this event
for (int i = listeners.length-2; i>=0; i-=2) {
if (listeners[i]==ActionListener.class) {
return true;
}
}
return false;
}
// --- variables -------------------------------------------
/**
* Name of the action to send notification that the
* contents of the field have been accepted. Typically
* this is bound to a carriage-return.
*/
public static final String notifyAction = "notify-field-accept";
private BoundedRangeModel visibility;
private int horizontalAlignment = LEADING;
private int columns;
private int columnWidth;
private String command;
private static final Action[] defaultActions = {
new NotifyAction()
};
/**
* @see #getUIClassID
* @see #readObject
*/
private static final String uiClassID = "TextFieldUI";
// --- Action implementations -----------------------------------
// Note that JFormattedTextField.CommitAction extends this
static class NotifyAction extends TextAction {
NotifyAction() {
super(notifyAction);
}
public void actionPerformed(ActionEvent e) {
JTextComponent target = getFocusedComponent();
if (target instanceof JTextField) {
JTextField field = (JTextField) target;
field.postActionEvent();
}
}
public boolean isEnabled() {
JTextComponent target = getFocusedComponent();
if (target instanceof JTextField) {
return ((JTextField)target).hasActionListener();
}
return false;
}
}
class ScrollRepainter implements ChangeListener, Serializable {
public void stateChanged(ChangeEvent e) {
repaint();
}
}
/**
* See <code>readObject</code> and <code>writeObject</code> in
* <code>JComponent</code> for more
* information about serialization in Swing.
*/
private void writeObject(ObjectOutputStream s) throws IOException {
s.defaultWriteObject();
if (getUIClassID().equals(uiClassID)) {
byte count = JComponent.getWriteObjCounter(this);
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