JDK 1.1 Source Code Directory
JDK 1.1 source code directory contains Java source code for JDK 1.1 core classes:
"C:\fyicenter\jdk-1.1.8\src".
Here is the list of Java classes of the JDK 1.1 source code:
✍: FYIcenter
⏎ java/awt/Scrollbar.java
/*
* @(#)Scrollbar.java 1.56 01/12/10
*
* Copyright 2002 Sun Microsystems, Inc. All rights reserved.
* SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
*/
package java.awt;
import java.awt.peer.ScrollbarPeer;
import java.awt.event.*;
import java.io.ObjectOutputStream;
import java.io.ObjectInputStream;
import java.io.IOException;
/**
* The <code>Scrollbar</code> class embodies a scroll bar, a
* familiar user-interface object. A scroll bar provides a
* convenient means for allowing a user to select from a
* range of values. The following three vertical
* scroll bars could be used as slider controls to pick
* the red, green, and blue components of a color:
* <p>
* <img src="images-awt/Scrollbar-1.gif"
* ALIGN=center HSPACE=10 VSPACE=7>
* <p>
* Each scroll bar in this example could be created with
* code similar to the following:
* <p>
* <hr><blockquote><pre>
* redSlider=new Scrollbar(Scrollbar.VERTICAL, 0, 1, 0, 255);
* add(redSlider);
* </pre></blockquote><hr>
* <p>
* Alternatively, a scroll bar can represent a range of values. For
* example, if a scroll bar is used for scrolling through text, the
* width of the "bubble" or "thumb" can represent the amount of text
* that is visible. Here is an example of a scroll bar that
* represents a range:
* <p>
* <img src="images-awt/Scrollbar-2.gif"
* ALIGN=center HSPACE=10 VSPACE=7>
* <p>
* The value range represented by the bubble is the <em>visible</em>
* range of the scroll bar. The horizontal scroll bar in this
* example could be created with code like the following:
* <p>
* <hr><blockquote><pre>
* ranger = new Scrollbar(Scrollbar.HORIZONTAL, 0, 64, 0, 255);
* add(ranger);
* </pre></blockquote><hr>
* <p>
* Note that the maximum value above, 255, is the maximum value for
* the scroll bar's bubble. The actual width of the
* scroll bar's track is 255 + 64. When the scroll bar
* is set to its maximum value, the left side of the bubble
* is at 255, and the right side is at 255 + 64.
* <p>
* Normally, the user changes the value of the scroll bar by
* making a gesture with the mouse. For example, the user can
* drag the scroll bar's bubble up and down, or click in the
* scroll bar's unit increment or block increment areas. Keyboard
* gestures can also be mapped to the scroll bar. By convention,
* the <b>Page Up</b> and <b>Page Down</b>
* keys are equivalent to clicking in the scroll bar's block
* increment and block decrement areas.
* <p>
* When the user changes the value of the scroll bar, the scroll bar
* receives an instance of <code>AdjustmentEvent</code>.
* The scroll bar processes this event, passing it along to
* any registered listeners.
* <p>
* Any object that wishes to be notified of changes to the
* scroll bar's value should implement
* <code>AdjustmentListener</code>, an interface defined in
* the package <code>java.awt.event</code>.
* Listeners can be added and removed dynamically by calling
* the methods <code>addAdjustmentListener</code> and
* <code>removeAdjustmentListener</code>.
* <p>
* The <code>AdjustmentEvent</code> class defines five types
* of adjustment event, listed here:
* <p>
* <ul>
* <li><code>AdjustmentEvent.TRACK</code> is sent out when the
* user drags the scroll bar's bubble.
* <li><code>AdjustmentEvent.UNIT_INCREMENT</code> is sent out
* when the user clicks in the left arrow of a horizontal scroll
* bar, or the top arrow of a vertical scroll bar, or makes the
* equivalent gesture from the keyboard.
* <li><code>AdjustmentEvent.UNIT_DECREMENT</code> is sent out
* when the user clicks in the right arrow of a horizontal scroll
* bar, or the bottom arrow of a vertical scroll bar, or makes the
* equivalent gesture from the keyboard.
* <li><code>AdjustmentEvent.BLOCK_INCREMENT</code> is sent out
* when the user clicks in the track, to the left of the bubble
* on a horizontal scroll bar, or above the bubble on a vertical
* scroll bar. By convention, the <b>Page Up</b>
* key is equivalent, if the user is using a keyboard that
* defines a <b>Page Up</b> key.
* <li><code>AdjustmentEvent.BLOCK_DECREMENT</code> is sent out
* when the user clicks in the track, to the right of the bubble
* on a horizontal scroll bar, or below the bubble on a vertical
* scroll bar. By convention, the <b>Page Down</b>
* key is equivalent, if the user is using a keyboard that
* defines a <b>Page Down</b> key.
* </ul>
* <p>
* The JDK 1.0 event system is supported for backwards
* compatibility, but its use with newer versions of JDK is
* discouraged. The fives types of adjustment event introduced
* with JDK 1.1 correspond to the five event types
* that are associated with scroll bars in previous JDK versions.
* The following list gives the adjustment event type,
* and the corresponding JDK 1.0 event type it replaces.
* <p>
* <ul>
* <li><code>AdjustmentEvent.TRACK</code> replaces
* <code>Event.SCROLL_ABSOLUTE</code>
* <li><code>AdjustmentEvent.UNIT_INCREMENT</code> replaces
* <code>Event.SCROLL_LINE_UP</code>
* <li><code>AdjustmentEvent.UNIT_DECREMENT</code> replaces
* <code>Event.SCROLL_LINE_DOWN</code>
* <li><code>AdjustmentEvent.BLOCK_INCREMENT</code> replaces
* <code>Event.SCROLL_PAGE_UP</code>
* <li><code>AdjustmentEvent.BLOCK_DECREMENT</code> replaces
* <code>Event.SCROLL_PAGE_DOWN</code>
* </ul>
* <p>
*
* @version 1.56 12/10/01
* @author Sami Shaio
* @see java.awt.event.AdjustmentEvent
* @see java.awt.event.AdjustmentListener
* @since JDK1.0
*/
public class Scrollbar extends Component implements Adjustable {
/**
* A constant that indicates a horizontal scroll bar.
* @since JDK1.0
*/
public static final int HORIZONTAL = 0;
/**
* A constant that indicates a vertical scroll bar.
* @since JDK1.0
*/
public static final int VERTICAL = 1;
/**
* The value of the Scrollbar.
*/
int value;
/**
* The maximum value of the Scrollbar.
*/
int maximum;
/**
* The minimum value of the Scrollbar.
*/
int minimum;
/**
* The size of the visible portion of the Scrollbar.
*/
int visibleAmount;
/**
* The Scrollbar's orientation--being either horizontal or vertical.
*/
int orientation;
/**
* The amount by which the scrollbar value will change when going
* up or down by a line.
*/
int lineIncrement = 1;
/**
* The amount by which the scrollbar value will change when going
* up or down by a page.
*/
int pageIncrement = 10;
transient AdjustmentListener adjustmentListener;
private static final String base = "scrollbar";
private static int nameCounter = 0;
/*
* JDK 1.1 serialVersionUID
*/
private static final long serialVersionUID = 8451667562882310543L;
/**
* Constructs a new vertical scroll bar.
* @since JDK1.0
*/
public Scrollbar() {
this(VERTICAL, 0, 10, 0, 100);
}
/**
* Constructs a new scroll bar with the specified orientation.
* <p>
* The <code>orientation</code> argument must take one of the two
* values <code>Scrollbar.HORIZONTAL</code>,
* or <code>Scrollbar.VERTICAL</code>,
* indicating a horizontal or vertical scroll bar, respectively.
* @param orientation indicates the orientation of the scroll bar.
* @exception IllegalArgumentException when an illegal value for
* the <code>orientation</code> argument is supplied.
* @since JDK1.0
*/
public Scrollbar(int orientation) {
this(orientation, 0, 10, 0, 100);
}
/**
* Constructs a new scroll bar with the specified orientation,
* initial value, page size, and minimum and maximum values.
* <p>
* The <code>orientation</code> argument must take one of the two
* values <code>Scrollbar.HORIZONTAL</code>,
* or <code>Scrollbar.VERTICAL</code>,
* indicating a horizontal or vertical scroll bar, respectively.
* <p>
* If the specified maximum value is less than the minimum value, it
* is changed to be the same as the minimum value. If the initial
* value is lower than the minimum value, it is changed to be the
* minimum value; if it is greater than the maximum value, it is
* changed to be the maximum value.
* @param orientation indicates the orientation of the scroll bar.
* @param value the initial value of the scroll bar.
* @param visible the size of the scroll bar's bubble, representing
* the visible portion; the scroll bar uses this
value when paging up or down by a page.
* @param minimum the minimum value of the scroll bar.
* @param maximum the maximum value of the scroll bar.
* @since JDK1.0
*/
public Scrollbar(int orientation, int value, int visible, int minimum, int maximum) {
switch (orientation) {
case HORIZONTAL:
case VERTICAL:
this.orientation = orientation;
break;
default:
throw new IllegalArgumentException("illegal scrollbar orientation");
}
setValues(value, visible, minimum, maximum);
}
/**
* Construct a name for this component. Called by getName() when the
* name is null.
*/
String constructComponentName() {
return base + nameCounter++;
}
/**
* Creates the Scrollbar's peer. The peer allows you to modify
* the appearance of the Scrollbar without changing any of its
* functionality.
*/
public void addNotify() {
synchronized (getTreeLock()) {
if (peer == null)
peer = getToolkit().createScrollbar(this);
super.addNotify();
}
}
/**
* Determines the orientation of this scroll bar.
* @return the orientation of this scroll bar, either
* <code>Scrollbar.HORIZONTAL</code> or
* <code>Scrollbar.VERTICAL</code>.
* @see java.awt.Scrollbar#setOrientation
* @since JDK1.0
*/
public int getOrientation() {
return orientation;
}
/**
* Sets the orientation for this scroll bar.
* @param the orientation of this scroll bar, either
* <code>Scrollbar.HORIZONTAL</code> or
* <code>Scrollbar.VERTICAL</code>.
* @see java.awt.Scrollbar#getOrientation
* @exception IllegalArgumentException if the value supplied
* for <code>orientation</code> is not a
* legal value.
* @since JDK1.1
*/
public void setOrientation(int orientation) {
synchronized (getTreeLock()) {
if (orientation == this.orientation) {
return;
}
switch (orientation) {
case HORIZONTAL:
case VERTICAL:
this.orientation = orientation;
break;
default:
throw new IllegalArgumentException("illegal scrollbar orientation");
}
/* Create a new peer with the specified orientation. */
if (peer != null) {
removeNotify();
addNotify();
invalidate();
}
}
}
/**
* Gets the current value of this scroll bar.
* @return the current value of this scroll bar.
* @see java.awt.Scrollbar#getMinimum
* @see java.awt.Scrollbar#getMaximum
* @since JDK1.0
*/
public int getValue() {
return value;
}
/**
* Sets the value of this scroll bar to the specified value.
* <p>
* If the value supplied is less than the current minimum or
* greater than the current maximum, then one of those values
* is substituted, as appropriate.
* <p>
* Normally, a program should change a scroll bar's
* value only by calling <code>setValues</code>.
* The <code>setValues</code> method simultaneously
* and synchronously sets the minimum, maximum, visible amount,
* and value properties of a scroll bar, so that they are
* mutually consistent.
* @param newValue the new value of the scroll bar.
* @see java.awt.Scrollbar#setValues
* @see java.awt.Scrollbar#getValue
* @see java.awt.Scrollbar#getMinimum
* @see java.awt.Scrollbar#getMaximum
* @since JDK1.0
*/
public void setValue(int newValue) {
/* Use setValues so that a consistent policy
* relating minimum, maximum, and value is enforced.
*/
setValues(newValue, visibleAmount, minimum, maximum);
}
/**
* Gets the minimum value of this scroll bar.
* @return the minimum value of this scroll bar.
* @see java.awt.Scrollbar#getValue
* @see java.awt.Scrollbar#getMaximum
* @since JDK1.0
*/
public int getMinimum() {
return minimum;
}
/**
* Sets the minimum value of this scroll bar.
* <p>
* Normally, a program should change a scroll bar's minimum
* value only by calling <code>setValues</code>.
* The <code>setValues</code> method simultaneously
* and synchronously sets the minimum, maximum, visible amount,
* and value properties of a scroll bar, so that they are
* mutually consistent.
* @param newMinimum the new minimum value
* for this scroll bar.
* @see java.awt.Scrollbar#setValues
* @see java.awt.Scrollbar#setMaximum
* @since JDK1.1
*/
public void setMinimum(int newMinimum) {
/* Use setValues so that a consistent policy
* relating minimum, maximum, and value is enforced.
*/
setValues(value, visibleAmount, newMinimum, maximum);
}
/**
* Gets the maximum value of this scroll bar.
* @return the maximum value of this scroll bar.
* @see java.awt.Scrollbar#getValue
* @see java.awt.Scrollbar#getMinimum
* @since JDK1.0
*/
public int getMaximum() {
return maximum;
}
/**
* Sets the maximum value of this scroll bar.
* <p>
* Normally, a program should change a scroll bar's maximum
* value only by calling <code>setValues</code>.
* The <code>setValues</code> method simultaneously
* and synchronously sets the minimum, maximum, visible amount,
* and value properties of a scroll bar, so that they are
* mutually consistent.
* @param newMaximum the new maximum value
* for this scroll bar.
* @see java.awtScrollbar#setValues
* @see java.awtScrollbar#setMinimum
* @since JDK1.1
*/
public void setMaximum(int newMaximum) {
/* Use setValues so that a consistent policy
* relating minimum, maximum, and value is enforced.
*/
setValues(value, visibleAmount, minimum, newMaximum);
}
/**
* Gets the visible amount of this scroll bar.
* <p>
* The visible amount of a scroll bar is the range of
* values represented by the width of the scroll bar's
* bubble. It is used to determine the scroll bar's
* block increment.
* @return the visible amount of this scroll bar.
* @see java.awt.Scrollbar#setVisibleAmount
* @since JDK1.1
*/
public int getVisibleAmount() {
return getVisible();
}
/**
* @deprecated As of JDK version 1.1,
* replaced by <code>getVisibleAmount()</code>.
*/
public int getVisible() {
return visibleAmount;
}
/**
* Sets the visible amount of this scroll bar.
* <p>
* The visible amount of a scroll bar is the range of
* values represented by the width of the scroll bar's
* bubble. It is used to determine the scroll bar's
* block increment.
* <p>
* Normally, a program should change a scroll bar's
* value only by calling <code>setValues</code>.
* The <code>setValues</code> method simultaneously
* and synchronously sets the minimum, maximum, visible amount,
* and value properties of a scroll bar, so that they are
* mutually consistent.
* @param newAmount the amount visible per page.
* @see java.awt.Scrollbar#getVisibleAmount
* @see java.awt.Scrollbar#setValues
* @since JDK1.1
*/
public void setVisibleAmount(int newAmount) {
setValues(value, newAmount, minimum, maximum);
}
/**
* Sets the unit increment for this scroll bar.
* <p>
* The unit increment is the value that is added (subtracted)
* when the user activates the unit increment area of the
* scroll bar, generally through a mouse or keyboard gesture
* that the scroll bar receives as an adjustment event.
* @param v the amount by which to increment or decrement
* the scroll bar's value.
* @see java.awt.Scrollbar#getUnitIncrement
* @since JDK1.1
*/
public void setUnitIncrement(int v) {
setLineIncrement(v);
}
/**
* @deprecated As of JDK version 1.1,
* replaced by <code>setUnitIncrement(int)</code>.
*/
public synchronized void setLineIncrement(int v) {
lineIncrement = v;
ScrollbarPeer peer = (ScrollbarPeer)this.peer;
if (peer != null) {
peer.setLineIncrement(v);
}
}
/**
* Gets the unit increment for this scrollbar.
* <p>
* The unit increment is the value that is added (subtracted)
* when the user activates the unit increment area of the
* scroll bar, generally through a mouse or keyboard gesture
* that the scroll bar receives as an adjustment event.
* @return the unit increment of this scroll bar.
* @see java.awt.Scrollbar#setUnitIncrement
* @since JDK1.1
*/
public int getUnitIncrement() {
return getLineIncrement();
}
/**
* @deprecated As of JDK version 1.1,
* replaced by <code>getUnitIncrement()</code>.
*/
public int getLineIncrement() {
return lineIncrement;
}
/**
* Sets the block increment for this scroll bar.
* <p>
* The block increment is the value that is added (subtracted)
* when the user activates the block increment area of the
* scroll bar, generally through a mouse or keyboard gesture
* that the scroll bar receives as an adjustment event.
* @param v the amount by which to increment or decrement
* the scroll bar's value.
* @see java.awt.Scrollbar#getBlockIncrement
* @since JDK1.1
*/
public void setBlockIncrement(int v) {
setPageIncrement(v);
}
/**
* @deprecated As of JDK version 1.1,
* replaced by <code>setBlockIncrement()</code>.
*/
public synchronized void setPageIncrement(int v) {
pageIncrement = v;
ScrollbarPeer peer = (ScrollbarPeer)this.peer;
if (peer != null) {
peer.setPageIncrement(v);
}
}
/**
* Gets the block increment of this scroll bar.
* <p>
* The block increment is the value that is added (subtracted)
* when the user activates the block increment area of the
* scroll bar, generally through a mouse or keyboard gesture
* that the scroll bar receives as an adjustment event.
* @return the block increment of this scroll bar.
* @see java.awt.Scrollbar#setBlockIncrement
* @since JDK1.1
*/
public int getBlockIncrement() {
return getPageIncrement();
}
/**
* @deprecated As of JDK version 1.1,
* replaced by <code>getBlockIncrement()</code>.
*/
public int getPageIncrement() {
return pageIncrement;
}
/**
* Sets the values of four properties for this scroll bar.
* <p>
* This method simultaneously and synchronously sets the values
* of four scroll bar properties, assuring that the values of
* these properties are mutually consistent. It enforces the
* constraints that maximum cannot be less than minimum, and that
* value cannot be less than the minimum or greater than the maximum.
* @param value is the position in the current window.
* @param visible is the amount visible per page.
* @param minimum is the minimum value of the scroll bar.
* @param maximum is the maximum value of the scroll bar.
* @since JDK1.0
*/
public synchronized void setValues(int value, int visible, int minimum, int maximum) {
if (maximum <= minimum) {
maximum = minimum + 1;
}
if (visible > maximum - minimum) {
visible = maximum - minimum;
}
if (visible < 1) {
visible = 1;
}
if (value < minimum) {
value = minimum;
}
if (value > maximum - visible) {
value = maximum - visible;
}
this.value = value;
this.visibleAmount = visible;
this.minimum = minimum;
this.maximum = maximum;
ScrollbarPeer peer = (ScrollbarPeer)this.peer;
if (peer != null) {
peer.setValues(value, visibleAmount, minimum, maximum);
}
}
/**
* Adds the specified adjustment listener to receive instances of
* <code>AdjustmentEvent</code> from this scroll bar.
* @param l the adjustment listener.
* @see java.awt.event.AdjustmentEvent
* @see java.awt.event.AdjustmentListener
* @see java.awt.Scrollbar#removeAdjustmentListener
* @since JDK1.1
*/
public synchronized void addAdjustmentListener(AdjustmentListener l) {
adjustmentListener = AWTEventMulticaster.add(adjustmentListener, l);
newEventsOnly = true;
}
/**
* Removes the specified adjustment listener so that it no longer
* receives instances of <code>AdjustmentEvent</code> from this scroll bar.
* @param l the adjustment listener.
* @see java.awt.event.AdjustmentEvent
* @see java.awt.event.AdjustmentListener
* @see java.awt.Scrollbar#addAdjustmentListener
* @since JDK1.1
*/
public synchronized void removeAdjustmentListener(AdjustmentListener l) {
adjustmentListener = AWTEventMulticaster.remove(adjustmentListener, l);
}
// REMIND: remove when filtering is done at lower level
boolean eventEnabled(AWTEvent e) {
if (e.id == AdjustmentEvent.ADJUSTMENT_VALUE_CHANGED) {
if ((eventMask & AWTEvent.ADJUSTMENT_EVENT_MASK) != 0 ||
adjustmentListener != null) {
return true;
}
return false;
}
return super.eventEnabled(e);
}
/**
* Processes events on this scroll bar. If the event is an
* instance of <code>AdjustmentEvent</code>, it invokes the
* <code>processAdjustmentEvent</code> method.
* Otherwise, it invokes its superclass's
* <code>processEvent</code> method.
* @param e the event.
* @see java.awt.event.AdjustmentEvent
* @see java.awt.Scrollbar#processAdjustmentEvent
* @since JDK1.1
*/
protected void processEvent(AWTEvent e) {
if (e instanceof AdjustmentEvent) {
processAdjustmentEvent((AdjustmentEvent)e);
return;
}
super.processEvent(e);
}
/**
* Processes adjustment events occurring on this
* scrollbar by dispatching them to any registered
* <code>AdjustmentListener</code> objects.
* <p>
* This method is not called unless adjustment events are
* enabled for this component. Adjustment events are enabled
* when one of the following occurs:
* <p><ul>
* <li>An <code>AdjustmentListener</code> object is registered
* via <code>addAdjustmentListener</code>.
* <li>Adjustment events are enabled via <code>enableEvents</code>.
* </ul><p>
* @param e the adjustment event.
* @see java.awt.event.AdjustmentEvent
* @see java.awt.event.AdjustmentListener
* @see java.awt.Scrollbar#addAdjustmentListener
* @see java.awt.Component#enableEvents
* @since JDK1.1
*/
protected void processAdjustmentEvent(AdjustmentEvent e) {
if (adjustmentListener != null) {
adjustmentListener.adjustmentValueChanged(e);
}
}
/**
* Returns the parameter string representing the state of
* this scroll bar. This string is useful for debugging.
* @return the parameter string of this scroll bar.
* @since JDK1.0
*/
protected String paramString() {
return super.paramString() +
",val=" + value +
",vis=" + visibleAmount +
",min=" + minimum +
",max=" + maximum +
((orientation == VERTICAL) ? ",vert" : ",horz");
}
/* Serialization support.
*/
private int scrollbarSerializedDataVersion = 1;
private void writeObject(ObjectOutputStream s)
throws IOException
{
s.defaultWriteObject();
AWTEventMulticaster.save(s, adjustmentListenerK, adjustmentListener);
s.writeObject(null);
}
private void readObject(ObjectInputStream s)
throws ClassNotFoundException, IOException
{
s.defaultReadObject();
Object keyOrNull;
while(null != (keyOrNull = s.readObject())) {
String key = ((String)keyOrNull).intern();
if (adjustmentListenerK == key)
addAdjustmentListener((AdjustmentListener)(s.readObject()));
else // skip value for unrecognized key
s.readObject();
}
}
}
⏎ java/awt/Scrollbar.java
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