JDK14/Java14源码在线阅读
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* accompanied this code).
*
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package javax.swing.text;
import sun.reflect.misc.ReflectUtil;
import sun.swing.SwingUtilities2;
import java.io.Serializable;
import java.lang.reflect.*;
import java.text.ParseException;
import javax.swing.*;
/**
* <code>DefaultFormatter</code> formats arbitrary objects. Formatting is done
* by invoking the <code>toString</code> method. In order to convert the
* value back to a String, your class must provide a constructor that
* takes a String argument. If no single argument constructor that takes a
* String is found, the returned value will be the String passed into
* <code>stringToValue</code>.
* <p>
* Instances of <code>DefaultFormatter</code> can not be used in multiple
* instances of <code>JFormattedTextField</code>. To obtain a copy of
* an already configured <code>DefaultFormatter</code>, use the
* <code>clone</code> method.
* <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}.
*
* @see javax.swing.JFormattedTextField.AbstractFormatter
*
* @since 1.4
*/
@SuppressWarnings("serial") // Same-version serialization only
public class DefaultFormatter extends JFormattedTextField.AbstractFormatter
implements Cloneable, Serializable {
/** Indicates if the value being edited must match the mask. */
private boolean allowsInvalid;
/** If true, editing mode is in overwrite (or strikethough). */
private boolean overwriteMode;
/** If true, any time a valid edit happens commitEdit is invoked. */
private boolean commitOnEdit;
/** Class used to create new instances. */
private Class<?> valueClass;
/** NavigationFilter that forwards calls back to DefaultFormatter. */
private NavigationFilter navigationFilter;
/** DocumentFilter that forwards calls back to DefaultFormatter. */
private DocumentFilter documentFilter;
/** Used during replace to track the region to replace. */
transient ReplaceHolder replaceHolder;
/**
* Creates a DefaultFormatter.
*/
public DefaultFormatter() {
overwriteMode = true;
allowsInvalid = true;
}
/**
* Installs the <code>DefaultFormatter</code> onto a particular
* <code>JFormattedTextField</code>.
* This will invoke <code>valueToString</code> to convert the
* current value from the <code>JFormattedTextField</code> to
* a String. This will then install the <code>Action</code>s from
* <code>getActions</code>, the <code>DocumentFilter</code>
* returned from <code>getDocumentFilter</code> and the
* <code>NavigationFilter</code> returned from
* <code>getNavigationFilter</code> onto the
* <code>JFormattedTextField</code>.
* <p>
* Subclasses will typically only need to override this if they
* wish to install additional listeners on the
* <code>JFormattedTextField</code>.
* <p>
* If there is a <code>ParseException</code> in converting the
* current value to a String, this will set the text to an empty
* String, and mark the <code>JFormattedTextField</code> as being
* in an invalid state.
* <p>
* While this is a public method, this is typically only useful
* for subclassers of <code>JFormattedTextField</code>.
* <code>JFormattedTextField</code> will invoke this method at
* the appropriate times when the value changes, or its internal
* state changes.
*
* @param ftf JFormattedTextField to format for, may be null indicating
* uninstall from current JFormattedTextField.
*/
public void install(JFormattedTextField ftf) {
super.install(ftf);
positionCursorAtInitialLocation();
}
/**
* Sets when edits are published back to the
* <code>JFormattedTextField</code>. If true, <code>commitEdit</code>
* is invoked after every valid edit (any time the text is edited). On
* the other hand, if this is false than the <code>DefaultFormatter</code>
* does not publish edits back to the <code>JFormattedTextField</code>.
* As such, the only time the value of the <code>JFormattedTextField</code>
* will change is when <code>commitEdit</code> is invoked on
* <code>JFormattedTextField</code>, typically when enter is pressed
* or focus leaves the <code>JFormattedTextField</code>.
*
* @param commit Used to indicate when edits are committed back to the
* JTextComponent
*/
public void setCommitsOnValidEdit(boolean commit) {
commitOnEdit = commit;
}
/**
* Returns when edits are published back to the
* <code>JFormattedTextField</code>.
*
* @return true if edits are committed after every valid edit
*/
public boolean getCommitsOnValidEdit() {
return commitOnEdit;
}
/**
* Configures the behavior when inserting characters. If
* <code>overwriteMode</code> is true (the default), new characters
* overwrite existing characters in the model.
*
* @param overwriteMode Indicates if overwrite or overstrike mode is used
*/
public void setOverwriteMode(boolean overwriteMode) {
this.overwriteMode = overwriteMode;
}
/**
* Returns the behavior when inserting characters.
*
* @return true if newly inserted characters overwrite existing characters
*/
public boolean getOverwriteMode() {
return overwriteMode;
}
/**
* Sets whether or not the value being edited is allowed to be invalid
* for a length of time (that is, <code>stringToValue</code> throws
* a <code>ParseException</code>).
* It is often convenient to allow the user to temporarily input an
* invalid value.
*
* @param allowsInvalid Used to indicate if the edited value must always
* be valid
*/
public void setAllowsInvalid(boolean allowsInvalid) {
this.allowsInvalid = allowsInvalid;
}
/**
* Returns whether or not the value being edited is allowed to be invalid
* for a length of time.
*
* @return false if the edited value must always be valid
*/
public boolean getAllowsInvalid() {
return allowsInvalid;
}
/**
* Sets that class that is used to create new Objects. If the
* passed in class does not have a single argument constructor that
* takes a String, String values will be used.
*
* @param valueClass Class used to construct return value from
* stringToValue
*/
public void setValueClass(Class<?> valueClass) {
this.valueClass = valueClass;
}
/**
* Returns that class that is used to create new Objects.
*
* @return Class used to construct return value from stringToValue
*/
public Class<?> getValueClass() {
return valueClass;
}
/**
* Converts the passed in String into an instance of
* <code>getValueClass</code> by way of the constructor that
* takes a String argument. If <code>getValueClass</code>
* returns null, the Class of the current value in the
* <code>JFormattedTextField</code> will be used. If this is null, a
* String will be returned. If the constructor throws an exception, a
* <code>ParseException</code> will be thrown. If there is no single
* argument String constructor, <code>string</code> will be returned.
*
* @throws ParseException if there is an error in the conversion
* @param string String to convert
* @return Object representation of text
*/
public Object stringToValue(String string) throws ParseException {
Class<?> vc = getValueClass();
JFormattedTextField ftf = getFormattedTextField();
if (vc == null && ftf != null) {
Object value = ftf.getValue();
if (value != null) {
vc = value.getClass();
}
}
if (vc != null) {
Constructor<?> cons;
try {
ReflectUtil.checkPackageAccess(vc);
SwingUtilities2.checkAccess(vc.getModifiers());
cons = vc.getConstructor(new Class<?>[]{String.class});
} catch (NoSuchMethodException nsme) {
cons = null;
}
if (cons != null) {
try {
SwingUtilities2.checkAccess(cons.getModifiers());
return cons.newInstance(new Object[] { string });
} catch (Throwable ex) {
throw new ParseException("Error creating instance", 0);
}
}
}
return string;
}
/**
* Converts the passed in Object into a String by way of the
* <code>toString</code> method.
*
* @throws ParseException if there is an error in the conversion
* @param value Value to convert
* @return String representation of value
*/
public String valueToString(Object value) throws ParseException {
if (value == null) {
return "";
}
return value.toString();
}
/**
* Returns the <code>DocumentFilter</code> used to restrict the characters
* that can be input into the <code>JFormattedTextField</code>.
*
* @return DocumentFilter to restrict edits
*/
protected DocumentFilter getDocumentFilter() {
if (documentFilter == null) {
documentFilter = new DefaultDocumentFilter();
}
return documentFilter;
}
/**
* Returns the <code>NavigationFilter</code> used to restrict where the
* cursor can be placed.
*
* @return NavigationFilter to restrict navigation
*/
protected NavigationFilter getNavigationFilter() {
if (navigationFilter == null) {
navigationFilter = new DefaultNavigationFilter();
}
return navigationFilter;
}
/**
* Creates a copy of the DefaultFormatter.
*
* @return copy of the DefaultFormatter
*/
public Object clone() throws CloneNotSupportedException {
DefaultFormatter formatter = (DefaultFormatter)super.clone();
formatter.navigationFilter = null;
formatter.documentFilter = null;
formatter.replaceHolder = null;
return formatter;
}
/**
* Positions the cursor at the initial location.
*/
void positionCursorAtInitialLocation() {
JFormattedTextField ftf = getFormattedTextField();
if (ftf != null) {
ftf.setCaretPosition(getInitialVisualPosition());
}
}
/**
* Returns the initial location to position the cursor at. This forwards
* the call to <code>getNextNavigatableChar</code>.
*/
int getInitialVisualPosition() {
return getNextNavigatableChar(0, 1);
}
/**
* Subclasses should override this if they want cursor navigation
* to skip certain characters. A return value of false indicates
* the character at <code>offset</code> should be skipped when
* navigating throught the field.
*/
boolean isNavigatable(int offset) {
return true;
}
/**
* Returns true if the text in <code>text</code> can be inserted. This
* does not mean the text will ultimately be inserted, it is used if
* text can trivially reject certain characters.
*/
boolean isLegalInsertText(String text) {
return true;
}
/**
* Returns the next editable character starting at offset incrementing
* the offset by <code>direction</code>.
*/
private int getNextNavigatableChar(int offset, int direction) {
int max = getFormattedTextField().getDocument().getLength();
while (offset >= 0 && offset < max) {
if (isNavigatable(offset)) {
return offset;
}
offset += direction;
}
return offset;
}
/**
* A convenience methods to return the result of deleting
* <code>deleteLength</code> characters at <code>offset</code>
* and inserting <code>replaceString</code> at <code>offset</code>
* in the current text field.
*/
String getReplaceString(int offset, int deleteLength,
String replaceString) {
String string = getFormattedTextField().getText();
String result;
result = string.substring(0, offset);
if (replaceString != null) {
result += replaceString;
}
if (offset + deleteLength < string.length()) {
result += string.substring(offset + deleteLength);
}
return result;
}
/*
* Returns true if the operation described by <code>rh</code> will
* result in a legal edit. This may set the <code>value</code>
* field of <code>rh</code>.
*/
boolean isValidEdit(ReplaceHolder rh) {
if (!getAllowsInvalid()) {
String newString = getReplaceString(rh.offset, rh.length, rh.text);
try {
rh.value = stringToValue(newString);
return true;
} catch (ParseException pe) {
return false;
}
}
return true;
}
/**
* Invokes <code>commitEdit</code> on the JFormattedTextField.
*/
void commitEdit() throws ParseException {
JFormattedTextField ftf = getFormattedTextField();
if (ftf != null) {
ftf.commitEdit();
}
}
/**
* Pushes the value to the JFormattedTextField if the current value
* is valid and invokes <code>setEditValid</code> based on the
* validity of the value.
*/
void updateValue() {
updateValue(null);
}
/**
* Pushes the <code>value</code> to the editor if we are to
* commit on edits. If <code>value</code> is null, the current value
* will be obtained from the text component.
*/
void updateValue(Object value) {
try {
if (value == null) {
String string = getFormattedTextField().getText();
value = stringToValue(string);
}
if (getCommitsOnValidEdit()) {
commitEdit();
}
setEditValid(true);
} catch (ParseException pe) {
setEditValid(false);
}
}
/**
* Returns the next cursor position from offset by incrementing
* <code>direction</code>. This uses
* <code>getNextNavigatableChar</code>
* as well as constraining the location to the max position.
*/
int getNextCursorPosition(int offset, int direction) {
int newOffset = getNextNavigatableChar(offset, direction);
int max = getFormattedTextField().getDocument().getLength();
if (!getAllowsInvalid()) {
if (direction == -1 && offset == newOffset) {
// Case where hit backspace and only characters before
// offset are fixed.
newOffset = getNextNavigatableChar(newOffset, 1);
if (newOffset >= max) {
newOffset = offset;
}
}
else if (direction == 1 && newOffset >= max) {
// Don't go beyond last editable character.
newOffset = getNextNavigatableChar(max - 1, -1);
if (newOffset < max) {
newOffset++;
}
}
}
return newOffset;
}
/**
* Resets the cursor by using getNextCursorPosition.
*/
void repositionCursor(int offset, int direction) {
getFormattedTextField().getCaret().setDot(getNextCursorPosition
(offset, direction));
}
/**
* Finds the next navigable character.
*/
int getNextVisualPositionFrom(JTextComponent text, int pos,
Position.Bias bias, int direction,
Position.Bias[] biasRet)
throws BadLocationException {
int value = text.getUI().getNextVisualPositionFrom(text, pos, bias,
direction, biasRet);
if (value == -1) {
return -1;
}
if (!getAllowsInvalid() && (direction == SwingConstants.EAST ||
direction == SwingConstants.WEST)) {
int last = -1;
while (!isNavigatable(value) && value != last) {
last = value;
value = text.getUI().getNextVisualPositionFrom(
text, value, bias, direction,biasRet);
}
int max = getFormattedTextField().getDocument().getLength();
if (last == value || value == max) {
if (value == 0) {
biasRet[0] = Position.Bias.Forward;
value = getInitialVisualPosition();
}
if (value >= max && max > 0) {
// Pending: should not assume forward!
biasRet[0] = Position.Bias.Forward;
value = getNextNavigatableChar(max - 1, -1) + 1;
}
}
}
return value;
}
/**
* Returns true if the edit described by <code>rh</code> will result
* in a legal value.
*/
boolean canReplace(ReplaceHolder rh) {
return isValidEdit(rh);
}
/**
* DocumentFilter method, funnels into <code>replace</code>.
*/
void replace(DocumentFilter.FilterBypass fb, int offset,
int length, String text,
AttributeSet attrs) throws BadLocationException {
ReplaceHolder rh = getReplaceHolder(fb, offset, length, text, attrs);
replace(rh);
}
/**
* If the edit described by <code>rh</code> is legal, this will
* return true, commit the edit (if necessary) and update the cursor
* position. This forwards to <code>canReplace</code> and
* <code>isLegalInsertText</code> as necessary to determine if
* the edit is in fact legal.
* <p>
* All of the DocumentFilter methods funnel into here, you should
* generally only have to override this.
*/
boolean replace(ReplaceHolder rh) throws BadLocationException {
boolean valid = true;
int direction = 1;
if (rh.length > 0 && (rh.text == null || rh.text.length() == 0) &&
(getFormattedTextField().getSelectionStart() != rh.offset ||
rh.length > 1)) {
direction = -1;
}
if (getOverwriteMode() && rh.text != null &&
getFormattedTextField().getSelectedText() == null)
{
rh.length = Math.min(Math.max(rh.length, rh.text.length()),
rh.fb.getDocument().getLength() - rh.offset);
}
if ((rh.text != null && !isLegalInsertText(rh.text)) ||
!canReplace(rh) ||
(rh.length == 0 && (rh.text == null || rh.text.length() == 0))) {
valid = false;
}
if (valid) {
int cursor = rh.cursorPosition;
rh.fb.replace(rh.offset, rh.length, rh.text, rh.attrs);
if (cursor == -1) {
cursor = rh.offset;
if (direction == 1 && rh.text != null) {
cursor = rh.offset + rh.text.length();
}
}
updateValue(rh.value);
repositionCursor(cursor, direction);
return true;
}
else {
invalidEdit();
}
return false;
}
/**
* NavigationFilter method, subclasses that wish finer control should
* override this.
*/
void setDot(NavigationFilter.FilterBypass fb, int dot, Position.Bias bias){
fb.setDot(dot, bias);
}
/**
* NavigationFilter method, subclasses that wish finer control should
* override this.
*/
void moveDot(NavigationFilter.FilterBypass fb, int dot,
Position.Bias bias) {
fb.moveDot(dot, bias);
}
/**
* Returns the ReplaceHolder to track the replace of the specified
* text.
*/
ReplaceHolder getReplaceHolder(DocumentFilter.FilterBypass fb, int offset,
int length, String text,
AttributeSet attrs) {
if (replaceHolder == null) {
replaceHolder = new ReplaceHolder();
}
replaceHolder.reset(fb, offset, length, text, attrs);
return replaceHolder;
}
/**
* ReplaceHolder is used to track where insert/remove/replace is
* going to happen.
*/
static class ReplaceHolder {
/** The FilterBypass that was passed to the DocumentFilter method. */
DocumentFilter.FilterBypass fb;
/** Offset where the remove/insert is going to occur. */
int offset;
/** Length of text to remove. */
int length;
/** The text to insert, may be null. */
String text;
/** AttributeSet to attach to text, may be null. */
AttributeSet attrs;
/** The resulting value, this may never be set. */
Object value;
/** Position the cursor should be adjusted from. If this is -1
* the cursor position will be adjusted based on the direction of
* the replace (-1: offset, 1: offset + text.length()), otherwise
* the cursor position is adusted from this position.
*/
int cursorPosition;
void reset(DocumentFilter.FilterBypass fb, int offset, int length,
String text, AttributeSet attrs) {
this.fb = fb;
this.offset = offset;
this.length = length;
this.text = text;
this.attrs = attrs;
this.value = null;
cursorPosition = -1;
}
}
/**
* NavigationFilter implementation that calls back to methods with
* same name in DefaultFormatter.
*/
private class DefaultNavigationFilter extends NavigationFilter
implements Serializable {
public void setDot(FilterBypass fb, int dot, Position.Bias bias) {
JTextComponent tc = DefaultFormatter.this.getFormattedTextField();
if (tc.composedTextExists()) {
// bypass the filter
fb.setDot(dot, bias);
} else {
DefaultFormatter.this.setDot(fb, dot, bias);
}
}
public void moveDot(FilterBypass fb, int dot, Position.Bias bias) {
JTextComponent tc = DefaultFormatter.this.getFormattedTextField();
if (tc.composedTextExists()) {
// bypass the filter
fb.moveDot(dot, bias);
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