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* 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.
*/
import javax.accessibility.*;
/**
* A <code>JTextArea</code> is a multi-line area that displays plain text.
* It is intended to be a lightweight component that provides source
* compatibility with the <code>java.awt.TextArea</code> class where it can
* reasonably do so.
* You can find information and examples of using all the text components in
* <a href="http://java.sun.com/docs/books/tutorial/uiswing/components/text.html">Using Text Components</a>,
* a section in <em>The Java Tutorial.</em>
*
* <p>
* This component has capabilities not found in the
* <code>java.awt.TextArea</code> class. The superclass should be
* consulted for additional capabilities.
* Alternative multi-line text classes with
* more capabilities are <code>JTextPane</code> and <code>JEditorPane</code>.
* <p>
* The <code>java.awt.TextArea</code> internally handles scrolling.
* <code>JTextArea</code> is different in that it doesn't manage scrolling,
* but implements the swing <code>Scrollable</code> interface. This allows it
* to be placed inside a <code>JScrollPane</code> if scrolling
* behavior is desired, and used directly if scrolling is not desired.
* <p>
* The <code>java.awt.TextArea</code> has the ability to do line wrapping.
* This was controlled by the horizontal scrolling policy. Since
* scrolling is not done by <code>JTextArea</code> directly, backward
* compatibility must be provided another way. <code>JTextArea</code> has
* a bound property for line wrapping that controls whether or
* not it will wrap lines. By default, the line wrapping property
* is set to false (not wrapped).
* <p>
* <code>java.awt.TextArea</code> has two properties <code>rows</code>
* and <code>columns</code> that are used to determine the preferred size.
* <code>JTextArea</code> uses these properties to indicate the
* preferred size of the viewport when placed inside a <code>JScrollPane</code>
* to match the functionality provided by <code>java.awt.TextArea</code>.
* <code>JTextArea</code> has a preferred size of what is needed to
* display all of the text, so that it functions properly inside of
* a <code>JScrollPane</code>. If the value for <code>rows</code>
* or <code>columns</code> is equal to zero,
* the preferred size along that axis is used for
* the viewport preferred size along the same axis.
* <p>
* The <code>java.awt.TextArea</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>
* DocumentListener myListener = ??;
* JTextArea myArea = ??;
* myArea.getDocument().addDocumentListener(myListener);
* </pre>
* <p>
* <dl>
* <dt><b><font size=+1>Newlines</font></b>
* <dd>
* For a discussion on how newlines are handled, see
* <a href="text/DefaultEditorKit.html">DefaultEditorKit</a>.
* </dl>
*
* <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<sup><font size="-2">TM</font></sup>
* has been added to the <code>java.beans</code> package.
* Please see {@link java.beans.XMLEncoder}.
*
* @beaninfo
* attribute: isContainer false
* description: A multi-line area that displays plain text.
*
* @author Timothy Prinzing
* @see JTextPane
* @see JEditorPane
*/
/**
* @see #getUIClassID
* @see #readObject
*/
/**
* Constructs a new TextArea. A default model is set, the initial string
*/
public JTextArea() {
}
/**
* Constructs a new TextArea with the specified text displayed.
*
* @param text the text to be displayed, or null
*/
}
/**
* Constructs a new empty TextArea with the specified number of
* rows and columns. A default model is created, and the initial
* string is null.
*
* @param rows the number of rows >= 0
* @param columns the number of columns >= 0
* @exception IllegalArgumentException if the rows or columns
* arguments are negative.
*/
}
/**
* Constructs a new TextArea with the specified text and number
* of rows and columns. A default model is created.
*
* @param text the text to be displayed, or null
* @param rows the number of rows >= 0
* @param columns the number of columns >= 0
* @exception IllegalArgumentException if the rows or columns
* arguments are negative.
*/
}
/**
* Constructs a new JTextArea with the given document model, and defaults
* for all of the other arguments (null, 0, 0).
*
* @param doc the model to use
*/
}
/**
* Constructs a new JTextArea with the specified number of rows
* and columns, and the given model. All of the constructors
* feed through this constructor.
*
* @param doc the model to use, or create a default one if null
* @param text the text to be displayed, null if none
* @param rows the number of rows >= 0
* @param columns the number of columns >= 0
* @exception IllegalArgumentException if the rows or columns
* arguments are negative.
*/
super();
doc = createDefaultModel();
}
}
if (rows < 0) {
}
if (columns < 0) {
}
LookAndFeel.installProperty(this,
"focusTraversalKeysForward",
LookAndFeel.installProperty(this,
"focusTraversalKeysBackward",
}
/**
* Returns the class ID for the UI.
*
* @return the ID ("TextAreaUI")
* @see JComponent#getUIClassID
* @see UIDefaults#getUI
*/
return uiClassID;
}
/**
* Creates the default implementation of the model
* to be used at construction if one isn't explicitly
* given. A new instance of PlainDocument is returned.
*
* @return the default document model
*/
return new PlainDocument();
}
/**
* Sets the number of characters to expand tabs to.
* This will be multiplied by the maximum advance for
* variable width fonts. A PropertyChange event ("tabSize") is fired
* when the tab size changes.
*
* @param size number of characters to expand to
* @see #getTabSize
* @beaninfo
* preferred: true
* bound: true
* description: the number of characters to expand tabs to
*/
int old = getTabSize();
}
}
/**
* Gets the number of characters used to expand tabs. If the document is
* null or doesn't have a tab setting, return a default of 8.
*
* @return the number of characters
*/
public int getTabSize() {
int size = 8;
if (i != null) {
}
}
return size;
}
/**
* Sets the line-wrapping policy of the text area. If set
* to true the lines will be wrapped if they are too long
* to fit within the allocated width. If set to false,
* the lines will always be unwrapped. A <code>PropertyChange</code>
* event ("lineWrap") is fired when the policy is changed.
* By default this property is false.
*
* @param wrap indicates if lines should be wrapped
* @see #getLineWrap
* @beaninfo
* preferred: true
* bound: true
* description: should lines be wrapped
*/
}
/**
* Gets the line-wrapping policy of the text area. If set
* to true the lines will be wrapped if they are too long
* to fit within the allocated width. If set to false,
* the lines will always be unwrapped.
*
* @return if lines will be wrapped
*/
public boolean getLineWrap() {
return wrap;
}
/**
* Sets the style of wrapping used if the text area is wrapping
* lines. If set to true the lines will be wrapped at word
* boundaries (whitespace) if they are too long
* to fit within the allocated width. If set to false,
* the lines will be wrapped at character boundaries.
* By default this property is false.
*
* @param word indicates if word boundaries should be used
* for line wrapping
* @see #getWrapStyleWord
* @beaninfo
* preferred: false
* bound: true
* description: should wrapping occur at word boundaries
*/
}
/**
* Gets the style of wrapping used if the text area is wrapping
* lines. If set to true the lines will be wrapped at word
* boundaries (ie whitespace) if they are too long
* to fit within the allocated width. If set to false,
* the lines will be wrapped at character boundaries.
*
* @return if the wrap style should be word boundaries
* instead of character boundaries
* @see #setWrapStyleWord
*/
public boolean getWrapStyleWord() {
return word;
}
/**
* Translates an offset into the components text to a
* line number.
*
* @param offset the offset >= 0
* @return the line number >= 0
* @exception BadLocationException thrown if the offset is
* less than zero or greater than the document length.
*/
if (offset < 0) {
} else {
}
}
/**
* Determines the number of lines contained in the area.
*
* @return the number of lines > 0
*/
public int getLineCount() {
return map.getElementCount();
}
/**
* Determines the offset of the start of the given line.
*
* @param line the line number to translate >= 0
* @return the offset >= 0
* @exception BadLocationException thrown if the line is
* less than zero or greater or equal to the number of
* lines contained in the document (as reported by
* getLineCount).
*/
int lineCount = getLineCount();
if (line < 0) {
} else {
return lineElem.getStartOffset();
}
}
/**
* Determines the offset of the end of the given line.
*
* @param line the line >= 0
* @return the offset >= 0
* @exception BadLocationException Thrown if the line is
* less than zero or greater or equal to the number of
* lines contained in the document (as reported by
* getLineCount).
*/
int lineCount = getLineCount();
if (line < 0) {
} else {
// hide the implicit break at the end of the document
}
}
// --- java.awt.TextArea methods ---------------------------------
/**
* Inserts the specified text at the specified position. Does nothing
* if the model is null or if the text is null or empty.
*
* @param str the text to insert
* @param pos the position at which to insert >= 0
* @exception IllegalArgumentException if pos is an
* invalid position in the model
* @see TextComponent#setText
* @see #replaceRange
*/
try {
} catch (BadLocationException e) {
throw new IllegalArgumentException(e.getMessage());
}
}
}
/**
* Appends the given text to the end of the document. Does nothing if
* the model is null or the string is null or empty.
*
* @param str the text to insert
* @see #insert
*/
try {
} catch (BadLocationException e) {
}
}
}
/**
* Replaces text from the indicated start to end position with the
* new text specified. Does nothing if the model is null. Simply
* does a delete if the new string is null or empty.
*
* @param str the text to use as the replacement
* @param start the start position >= 0
* @param end the end position >= start
* @exception IllegalArgumentException if part of the range is an
* invalid position in the model
* @see #insert
* @see #replaceRange
*/
throw new IllegalArgumentException("end before start");
}
try {
if (doc instanceof AbstractDocument) {
null);
}
else {
}
} catch (BadLocationException e) {
throw new IllegalArgumentException(e.getMessage());
}
}
}
/**
* Returns the number of rows in the TextArea.
*
* @return the number of rows >= 0
*/
public int getRows() {
return rows;
}
/**
* Sets the number of rows for this TextArea. Calls invalidate() after
* setting the new value.
*
* @param rows the number of rows >= 0
* @exception IllegalArgumentException if rows is less than 0
* @see #getRows
* @beaninfo
* description: the number of rows preferred for display
*/
if (rows < 0) {
throw new IllegalArgumentException("rows less than zero.");
}
invalidate();
}
}
/**
* Defines the meaning of the height of a row. This defaults to
* the height of the font.
*
* @return the height >= 1
*/
protected int getRowHeight() {
if (rowHeight == 0) {
}
return rowHeight;
}
/**
* Returns the number of columns in the TextArea.
*
* @return number of columns >= 0
*/
public int getColumns() {
return columns;
}
/**
* Sets the number of columns for this TextArea. Does an invalidate()
* after setting the new value.
*
* @param columns the number of columns >= 0
* @exception IllegalArgumentException if columns is less than 0
* @see #getColumns
* @beaninfo
* description: the number of columns preferred for display
*/
if (columns < 0) {
throw new IllegalArgumentException("columns less than zero.");
}
invalidate();
}
}
/**
* Gets 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) {
}
return columnWidth;
}
// --- Component methods -----------------------------------------
/**
* Returns the preferred size of the TextArea. This is the
* maximum of the size needed to display the text and the
* size requested for the viewport.
*
* @return the size
*/
Dimension d = super.getPreferredSize();
if (columns != 0) {
}
if (rows != 0) {
}
return d;
}
/**
* Sets the current font. This removes cached row height and column
* width so the new font will be reflected, and calls revalidate().
*
* @param f the font to use as the current font
*/
super.setFont(f);
rowHeight = 0;
columnWidth = 0;
}
/**
* Returns a string representation of this JTextArea. This method
* is intended to be used only for debugging purposes, and the
* content and format of the returned string may vary between
* implementations. The returned string may be empty but may not
* be <code>null</code>.
*
* @return a string representation of this JTextArea.
*/
"true" : "false");
"true" : "false");
return super.paramString() +
",colums=" + columns +
",columWidth=" + columnWidth +
",rows=" + rows +
",rowHeight=" + rowHeight +
",word=" + wordString +
",wrap=" + wrapString;
}
// --- Scrollable methods ----------------------------------------
/**
* Returns true if a viewport should always force the width of this
* Scrollable to match the width of the viewport. This is implemented
* to return true if the line wrapping policy is true, and false
* if lines are not being wrapped.
*
* @return true if a viewport should force the Scrollables width
* to match its own.
*/
public boolean getScrollableTracksViewportWidth() {
return (wrap) ? true : super.getScrollableTracksViewportWidth();
}
/**
* Returns the preferred size of the viewport if this component
* is embedded in a JScrollPane. This uses the desired column
* and row settings if they have been set, otherwise the superclass
* behavior is used.
*
* @return The preferredSize of a JViewport whose view is this Scrollable.
* @see JViewport#getPreferredSize
*/
return size;
}
/**
* Components that display logical rows or columns should compute
* the scroll increment that will completely expose one new row
* or column, depending on the value of orientation. This is implemented
* to use the values returned by the <code>getRowHeight</code> and
* <code>getColumnWidth</code> methods.
* <p>
* Scrolling containers, like JScrollPane, will use this method
* each time the user requests a unit scroll.
*
* @param visibleRect the view area visible within the viewport
* @param orientation Either SwingConstants.VERTICAL or
* SwingConstants.HORIZONTAL.
* @return The "unit" increment for scrolling in the specified direction
* @exception IllegalArgumentException for an invalid orientation
* @see JScrollBar#setUnitIncrement
* @see #getRowHeight
* @see #getColumnWidth
*/
switch (orientation) {
case SwingConstants.VERTICAL:
return getRowHeight();
case SwingConstants.HORIZONTAL:
return getColumnWidth();
default:
}
}
/**
* See readObject() and writeObject() in JComponent for more
* information about serialization in Swing.
*/
s.defaultWriteObject();
}
}
}
/////////////////
// Accessibility support
////////////////
/**
* Gets the AccessibleContext associated with this JTextArea.
* For JTextAreas, the AccessibleContext takes the form of an
* AccessibleJTextArea.
* A new AccessibleJTextArea instance is created if necessary.
*
* @return an AccessibleJTextArea that serves as the
* AccessibleContext of this JTextArea
*/
if (accessibleContext == null) {
accessibleContext = new AccessibleJTextArea();
}
return accessibleContext;
}
/**
* This class implements accessibility support for the
* <code>JTextArea</code> class. It provides an implementation of the
* Java Accessibility API appropriate to text area user-interface
* elements.
* <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<sup><font size="-2">TM</font></sup>
* has been added to the <code>java.beans</code> package.
* Please see {@link java.beans.XMLEncoder}.
*/
/**
* Gets the state set of this object.
*
* @return an instance of AccessibleStateSet describing the states
* of the object
* @see AccessibleStateSet
*/
return states;
}
}
// --- variables -------------------------------------------------
private int rows;
private int columns;
private int columnWidth;
private int rowHeight;
private boolean wrap;
private boolean word;
}