Java TextComponentPeer类代码示例

import java.awt.peer.TextComponentPeer; //导入依赖的package包/类
/**
 * Sets the position of the text insertion caret.
 * The caret position is constrained to be between 0
 * and the last character of the text, inclusive.
 * If the passed-in value is greater than this range,
 * the value is set to the last character (or 0 if
 * the <code>TextComponent</code> contains no text)
 * and no error is returned.  If the passed-in value is
 * less than 0, an <code>IllegalArgumentException</code>
 * is thrown.
 *
 * @param        position the position of the text insertion caret
 * @exception    IllegalArgumentException if <code>position</code>
 *               is less than zero
 * @since        JDK1.1
 */
public synchronized void setCaretPosition(int position) {
    if (position < 0) {
        throw new IllegalArgumentException("position less than zero.");
    }

    int maxposition = getText().length();
    if (position > maxposition) {
        position = maxposition;
    }

    TextComponentPeer peer = (TextComponentPeer)this.peer;
    if (peer != null) {
        peer.setCaretPosition(position);
    } else {
        select(position, position);
    }
}
 

import java.awt.peer.TextComponentPeer; //导入依赖的package包/类
/**
 * Returns the position of the text insertion caret.
 * The caret position is constrained to be between 0
 * and the last character of the text, inclusive.
 * If the text or caret have not been set, the default
 * caret position is 0.
 *
 * @return       the position of the text insertion caret
 * @see #setCaretPosition(int)
 * @since        JDK1.1
 */
public synchronized int getCaretPosition() {
    TextComponentPeer peer = (TextComponentPeer)this.peer;
    int position = 0;

    if (peer != null) {
        position = peer.getCaretPosition();
    } else {
        position = selectionStart;
    }
    int maxposition = getText().length();
    if (position > maxposition) {
        position = maxposition;
    }
    return position;
}
 

import java.awt.peer.TextComponentPeer; //导入依赖的package包/类
/**
 * Writes default serializable fields to stream.  Writes
 * a list of serializable TextListener(s) as optional data.
 * The non-serializable TextListener(s) are detected and
 * no attempt is made to serialize them.
 *
 * @serialData Null terminated sequence of zero or more pairs.
 *             A pair consists of a String and Object.
 *             The String indicates the type of object and
 *             is one of the following :
 *             textListenerK indicating and TextListener object.
 *
 * @see AWTEventMulticaster#save(ObjectOutputStream, String, EventListener)
 * @see java.awt.Component#textListenerK
 */
private void writeObject(java.io.ObjectOutputStream s)
  throws IOException
{
    // Serialization support.  Since the value of the fields
    // selectionStart, selectionEnd, and text aren't necessarily
    // up to date, we sync them up with the peer before serializing.
    TextComponentPeer peer = (TextComponentPeer)this.peer;
    if (peer != null) {
        text = peer.getText();
        selectionStart = peer.getSelectionStart();
        selectionEnd = peer.getSelectionEnd();
    }

    s.defaultWriteObject();

    AWTEventMulticaster.save(s, textListenerK, textListener);
    s.writeObject(null);
}
 

import java.awt.peer.TextComponentPeer; //导入依赖的package包/类
/**
 * Sets the text that is presented by this
 * text component to be the specified text.
 * @param       t   the new text;
 *                  if this parameter is {@code null} then
 *                  the text is set to the empty string ""
 * @see         java.awt.TextComponent#getText
 */
public synchronized void setText(String t) {
    if (t == null) {
        t = "";
    }
    TextComponentPeer peer = (TextComponentPeer)this.peer;
    if (peer != null) {
        text = peer.getText();
        // Please note that we do not want to post an event
        // if TextArea.setText() or TextField.setText() replaces text
        // by same text, that is, if component's text remains unchanged.
        if (!t.equals(text)) {
            text = t;
            peer.setText(text);
        }
    } else {
        text = t;
    }
}
 

import java.awt.peer.TextComponentPeer; //导入依赖的package包/类
/**
 * Sets the position of the text insertion caret.
 * The caret position is constrained to be between 0
 * and the last character of the text, inclusive.
 * If the passed-in value is greater than this range,
 * the value is set to the last character (or 0 if
 * the {@code TextComponent} contains no text)
 * and no error is returned.  If the passed-in value is
 * less than 0, an {@code IllegalArgumentException}
 * is thrown.
 *
 * @param        position the position of the text insertion caret
 * @exception    IllegalArgumentException if {@code position}
 *               is less than zero
 * @since        1.1
 */
public synchronized void setCaretPosition(int position) {
    if (position < 0) {
        throw new IllegalArgumentException("position less than zero.");
    }

    int maxposition = getText().length();
    if (position > maxposition) {
        position = maxposition;
    }

    TextComponentPeer peer = (TextComponentPeer)this.peer;
    if (peer != null) {
        peer.setCaretPosition(position);
    } else {
        select(position, position);
    }
}
 

import java.awt.peer.TextComponentPeer; //导入依赖的package包/类
/**
 * Returns the position of the text insertion caret.
 * The caret position is constrained to be between 0
 * and the last character of the text, inclusive.
 * If the text or caret have not been set, the default
 * caret position is 0.
 *
 * @return       the position of the text insertion caret
 * @see #setCaretPosition(int)
 * @since        1.1
 */
public synchronized int getCaretPosition() {
    TextComponentPeer peer = (TextComponentPeer)this.peer;
    int position = 0;

    if (peer != null) {
        position = peer.getCaretPosition();
    } else {
        position = selectionStart;
    }
    int maxposition = getText().length();
    if (position > maxposition) {
        position = maxposition;
    }
    return position;
}
 

import java.awt.peer.TextComponentPeer; //导入依赖的package包/类
/**
 * This method sets the selected text range to the text between the
 * specified start and end positions.  Illegal values for these
 * positions are silently fixed.
 *
 * @param selectionStart The new start position for the selected text.
 * @param selectionEnd The new end position for the selected text.
 */
public synchronized void select(int selectionStart, int selectionEnd)
{
  if (selectionStart < 0)
    selectionStart = 0;

  if (selectionStart > getText().length())
    selectionStart = text.length();

  if (selectionEnd > text.length())
    selectionEnd = text.length();

  if (selectionStart > selectionEnd)
    selectionStart = selectionEnd;

  this.selectionStart = selectionStart;
  this.selectionEnd = selectionEnd;

  TextComponentPeer tcp = (TextComponentPeer) getPeer();
  if (tcp != null)
    tcp.select(selectionStart, selectionEnd);
}
 

import java.awt.peer.TextComponentPeer; //导入依赖的package包/类
/**
 * This method sets the selected text range to the text between the
 * specified start and end positions.  Illegal values for these
 * positions are silently fixed.
 *
 * @param selectionStart The new start position for the selected text.
 * @param selectionEnd The new end position for the selected text.
 */
public synchronized void select(int selectionStart, int selectionEnd)
{
  if (selectionStart < 0)
    selectionStart = 0;

  if (selectionStart > getText().length())
    selectionStart = text.length();

  if (selectionEnd > text.length())
    selectionEnd = text.length();

  if (selectionStart > selectionEnd)
    selectionStart = selectionEnd;

  this.selectionStart = selectionStart;
  this.selectionEnd = selectionEnd;
  
  TextComponentPeer tcp = (TextComponentPeer) getPeer();
  if (tcp != null)
    tcp.select(selectionStart, selectionEnd);
}
 

import java.awt.peer.TextComponentPeer; //导入依赖的package包/类
/**
    * Sets the position of the text insertion caret.
    * The caret position is constrained to be between 0
    * and the last character of the text, inclusive.
    * If the passed-in value is greater than this range,
    * the value is set to the last character (or 0 if
    * the <code>TextComponent</code> contains no text)
    * and no error is returned.  If the passed-in value is
    * less than 0, an <code>IllegalArgumentException</code>
    * is thrown.
    * 
    * @param        position the position of the text insertion caret
    * @exception    IllegalArgumentException if <code>position</code>
    *               is less than zero
    * @since        JDK1.1
    */
   public synchronized void setCaretPosition(int position) {
if (position < 0) {
    throw new IllegalArgumentException("position less than zero.");
}

int maxposition = getText().length();
if (position > maxposition) {
    position = maxposition;
}

TextComponentPeer peer = (TextComponentPeer)this.peer;
if (peer != null) {
    peer.setCaretPosition(position);
} else {
    select(position, position);
}
   }
 

import java.awt.peer.TextComponentPeer; //导入依赖的package包/类
/**
    * Returns the position of the text insertion caret.
    * The caret position is constrained to be between 0
    * and the last character of the text, inclusive.
    * If the text or caret have not been set, the default
    * caret position is 0.
    *
    * @return       the position of the text insertion caret
    * @see #setCaretPosition(int)
    * @since        JDK1.1
    */
   public synchronized int getCaretPosition() {
       TextComponentPeer peer = (TextComponentPeer)this.peer;
int position = 0;

if (peer != null) {
    position = peer.getCaretPosition();
} else {
    position = selectionStart;
}
       int maxposition = getText().length();
       if (position > maxposition) {
           position = maxposition;
       }
       return position;
   }
 

import java.awt.peer.TextComponentPeer; //导入依赖的package包/类
/**
 * Writes default serializable fields to stream.  Writes
 * a list of serializable TextListener(s) as optional data.
 * The non-serializable TextListener(s) are detected and
 * no attempt is made to serialize them.
 *
 * @serialData Null terminated sequence of zero or more pairs.
 *             A pair consists of a String and Object.
 *             The String indicates the type of object and
 *             is one of the following :
 *             textListenerK indicating and TextListener object.
 *
 * @see AWTEventMulticaster#save(ObjectOutputStream, String, EventListener)
 * @see java.awt.Component#textListenerK
 */
private void writeObject(java.io.ObjectOutputStream s)
  throws IOException 
{
    // Serialization support.  Since the value of the fields
    // selectionStart, selectionEnd, and text aren't necessarily
    // up to date, we sync them up with the peer before serializing.
    TextComponentPeer peer = (TextComponentPeer)this.peer;
    if (peer != null) {
        text = peer.getText();
        selectionStart = peer.getSelectionStart();
        selectionEnd = peer.getSelectionEnd();
    }

    s.defaultWriteObject();

    AWTEventMulticaster.save(s, textListenerK, textListener);
    s.writeObject(null);
}