JDK8/Java8源码在线阅读
/*
* Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* 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
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*/
package javax.swing;
import java.awt.*;
import java.awt.event.*;
import java.beans.*;
import javax.swing.plaf.*;
import javax.accessibility.*;
import java.io.ObjectOutputStream;
import java.io.ObjectInputStream;
import java.io.IOException;
/**
* An implementation of a check box -- an item that can be selected or
* deselected, and which displays its state to the user.
* By convention, any number of check boxes in a group can be selected.
* See <a href="https://docs.oracle.com/javase/tutorial/uiswing/components/button.html">How to Use Buttons, Check Boxes, and Radio Buttons</a>
* in <em>The Java Tutorial</em>
* for examples and information on using check boxes.
* <p>
* Buttons can be configured, and to some degree controlled, by
* <code><a href="Action.html">Action</a></code>s. Using an
* <code>Action</code> with a button has many benefits beyond directly
* configuring a button. Refer to <a href="Action.html#buttonActions">
* Swing Components Supporting <code>Action</code></a> for more
* details, and you can find more information in <a
* href="https://docs.oracle.com/javase/tutorial/uiswing/misc/action.html">How
* to Use Actions</a>, a section in <em>The Java Tutorial</em>.
* <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}.
*
* @see JRadioButton
*
* @beaninfo
* attribute: isContainer false
* description: A component which can be selected or deselected.
*
* @author Jeff Dinkins
*/
public class JCheckBox extends JToggleButton implements Accessible {
/** Identifies a change to the flat property. */
public static final String BORDER_PAINTED_FLAT_CHANGED_PROPERTY = "borderPaintedFlat";
private boolean flat = false;
/**
* @see #getUIClassID
* @see #readObject
*/
private static final String uiClassID = "CheckBoxUI";
/**
* Creates an initially unselected check box button with no text, no icon.
*/
public JCheckBox () {
this(null, null, false);
}
/**
* Creates an initially unselected check box with an icon.
*
* @param icon the Icon image to display
*/
public JCheckBox(Icon icon) {
this(null, icon, false);
}
/**
* Creates a check box with an icon and specifies whether
* or not it is initially selected.
*
* @param icon the Icon image to display
* @param selected a boolean value indicating the initial selection
* state. If <code>true</code> the check box is selected
*/
public JCheckBox(Icon icon, boolean selected) {
this(null, icon, selected);
}
/**
* Creates an initially unselected check box with text.
*
* @param text the text of the check box.
*/
public JCheckBox (String text) {
this(text, null, false);
}
/**
* Creates a check box where properties are taken from the
* Action supplied.
*
* @since 1.3
*/
public JCheckBox(Action a) {
this();
setAction(a);
}
/**
* Creates a check box with text and specifies whether
* or not it is initially selected.
*
* @param text the text of the check box.
* @param selected a boolean value indicating the initial selection
* state. If <code>true</code> the check box is selected
*/
public JCheckBox (String text, boolean selected) {
this(text, null, selected);
}
/**
* Creates an initially unselected check box with
* the specified text and icon.
*
* @param text the text of the check box.
* @param icon the Icon image to display
*/
public JCheckBox(String text, Icon icon) {
this(text, icon, false);
}
/**
* Creates a check box with text and icon,
* and specifies whether or not it is initially selected.
*
* @param text the text of the check box.
* @param icon the Icon image to display
* @param selected a boolean value indicating the initial selection
* state. If <code>true</code> the check box is selected
*/
public JCheckBox (String text, Icon icon, boolean selected) {
super(text, icon, selected);
setUIProperty("borderPainted", Boolean.FALSE);
setHorizontalAlignment(LEADING);
}
/**
* Sets the <code>borderPaintedFlat</code> property,
* which gives a hint to the look and feel as to the
* appearance of the check box border.
* This is usually set to <code>true</code> when a
* <code>JCheckBox</code> instance is used as a
* renderer in a component such as a <code>JTable</code> or
* <code>JTree</code>. The default value for the
* <code>borderPaintedFlat</code> property is <code>false</code>.
* This method fires a property changed event.
* Some look and feels might not implement flat borders;
* they will ignore this property.
*
* @param b <code>true</code> requests that the border be painted flat;
* <code>false</code> requests normal borders
* @see #isBorderPaintedFlat
* @beaninfo
* bound: true
* attribute: visualUpdate true
* description: Whether the border is painted flat.
* @since 1.3
*/
public void setBorderPaintedFlat(boolean b) {
boolean oldValue = flat;
flat = b;
firePropertyChange(BORDER_PAINTED_FLAT_CHANGED_PROPERTY, oldValue, flat);
if (b != oldValue) {
revalidate();
repaint();
}
}
/**
* Gets the value of the <code>borderPaintedFlat</code> property.
*
* @return the value of the <code>borderPaintedFlat</code> property
* @see #setBorderPaintedFlat
* @since 1.3
*/
public boolean isBorderPaintedFlat() {
return flat;
}
/**
* Resets the UI property to a value from the current look and feel.
*
* @see JComponent#updateUI
*/
public void updateUI() {
setUI((ButtonUI)UIManager.getUI(this));
}
/**
* Returns a string that specifies the name of the L&F class
* that renders this component.
*
* @return the string "CheckBoxUI"
* @see JComponent#getUIClassID
* @see UIDefaults#getUI
* @beaninfo
* expert: true
* description: A string that specifies the name of the L&F class
*/
public String getUIClassID() {
return uiClassID;
}
/**
* The icon for checkboxs comes from the look and feel,
* not the Action; this is overriden to do nothing.
*/
void setIconFromAction(Action a) {
}
/*
* See readObject and writeObject in JComponent 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);
JComponent.setWriteObjCounter(this, --count);
if (count == 0 && ui != null) {
ui.installUI(this);
}
}
}
/**
* See JComponent.readObject() for information about serialization
* in Swing.
*/
private void readObject(ObjectInputStream s)
throws IOException, ClassNotFoundException
{
s.defaultReadObject();
if (getUIClassID().equals(uiClassID)) {
updateUI();
}
}
/**
* Returns a string representation of this JCheckBox. 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>.
* specific new aspects of the JFC components.
*
* @return a string representation of this JCheckBox.
*/
protected String paramString() {
return super.paramString();
}
/////////////////
// Accessibility support
////////////////
/**
* Gets the AccessibleContext associated with this JCheckBox.
* For JCheckBoxes, the AccessibleContext takes the form of an
* AccessibleJCheckBox.
* A new AccessibleJCheckBox instance is created if necessary.
*
* @return an AccessibleJCheckBox that serves as the
* AccessibleContext of this JCheckBox
* @beaninfo
* expert: true
* description: The AccessibleContext associated with this CheckBox.
*/
public AccessibleContext getAccessibleContext() {
if (accessibleContext == null) {
accessibleContext = new AccessibleJCheckBox();
}
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