JDK14/Java14源码在线阅读
/*
* Copyright (c) 1997, 2015, 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.
*
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package javax.swing;
import java.awt.*;
import java.awt.event.*;
import java.beans.JavaBean;
import java.beans.BeanProperty;
import javax.swing.plaf.*;
import javax.accessibility.*;
import java.io.ObjectOutputStream;
import java.io.IOException;
import java.util.Iterator;
/**
* An implementation of a two-state button.
* The <code>JRadioButton</code> and <code>JCheckBox</code> classes
* are subclasses of this class.
* For information on using them see
* <a
href="https://docs.oracle.com/javase/tutorial/uiswing/components/button.html">How to Use Buttons, Check Boxes, and Radio Buttons</a>,
* a section in <em>The Java Tutorial</em>.
* <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
* @see JCheckBox
* @author Jeff Dinkins
* @since 1.2
*/
@JavaBean(defaultProperty = "UIClassID", description = "An implementation of a two-state button.")
@SwingContainer(false)
@SuppressWarnings("serial") // Same-version serialization only
public class JToggleButton extends AbstractButton implements Accessible {
/**
* @see #getUIClassID
* @see #readObject
*/
private static final String uiClassID = "ToggleButtonUI";
/**
* Creates an initially unselected toggle button
* without setting the text or image.
*/
public JToggleButton () {
this(null, null, false);
}
/**
* Creates an initially unselected toggle button
* with the specified image but no text.
*
* @param icon the image that the button should display
*/
public JToggleButton(Icon icon) {
this(null, icon, false);
}
/**
* Creates a toggle button with the specified image
* and selection state, but no text.
*
* @param icon the image that the button should display
* @param selected if true, the button is initially selected;
* otherwise, the button is initially unselected
*/
public JToggleButton(Icon icon, boolean selected) {
this(null, icon, selected);
}
/**
* Creates an unselected toggle button with the specified text.
*
* @param text the string displayed on the toggle button
*/
public JToggleButton (String text) {
this(text, null, false);
}
/**
* Creates a toggle button with the specified text
* and selection state.
*
* @param text the string displayed on the toggle button
* @param selected if true, the button is initially selected;
* otherwise, the button is initially unselected
*/
public JToggleButton (String text, boolean selected) {
this(text, null, selected);
}
/**
* Creates a toggle button where properties are taken from the
* Action supplied.
*
* @param a an instance of an {@code Action}
* @since 1.3
*/
public JToggleButton(Action a) {
this();
setAction(a);
}
/**
* Creates a toggle button that has the specified text and image,
* and that is initially unselected.
*
* @param text the string displayed on the button
* @param icon the image that the button should display
*/
public JToggleButton(String text, Icon icon) {
this(text, icon, false);
}
/**
* Creates a toggle button with the specified text, image, and
* selection state.
*
* @param text the text of the toggle button
* @param icon the image that the button should display
* @param selected if true, the button is initially selected;
* otherwise, the button is initially unselected
*/
public JToggleButton (String text, Icon icon, boolean selected) {
// Create the model
setModel(new ToggleButtonModel());
model.setSelected(selected);
// initialize
init(text, icon);
}
/**
* 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 "ToggleButtonUI"
* @see JComponent#getUIClassID
* @see UIDefaults#getUI
*/
@BeanProperty(bound = false, description
= "A string that specifies the name of the L&F class")
public String getUIClassID() {
return uiClassID;
}
/**
* Overriden to return true, JToggleButton supports
* the selected state.
*/
boolean shouldUpdateSelectedStateFromAction() {
return true;
}
private JToggleButton getGroupSelection(FocusEvent.Cause cause) {
switch (cause) {
case ACTIVATION:
case TRAVERSAL:
case TRAVERSAL_UP:
case TRAVERSAL_DOWN:
case TRAVERSAL_FORWARD:
case TRAVERSAL_BACKWARD:
ButtonModel model = getModel();
JToggleButton selection = this;
if (model != null) {
ButtonGroup group = model.getGroup();
if (group != null && group.getSelection() != null
&& !group.isSelected(model)) {
Iterator<AbstractButton> iterator =
group.getElements().asIterator();
while (iterator.hasNext()) {
AbstractButton member = iterator.next();
if (group.isSelected(member.getModel())) {
if (member instanceof JToggleButton &&
member.isVisible() && member.isDisplayable() &&
member.isEnabled() && member.isFocusable()) {
selection = (JToggleButton) member;
}
break;
}
}
}
}
return selection;
default:
return this;
}
}
/**
* If this toggle button is a member of the {@link ButtonGroup} which has
* another toggle button which is selected and can be the focus owner,
* and the focus cause argument denotes window activation or focus
* traversal action of any direction the result of the method execution
* is the same as calling
* {@link Component#requestFocus(FocusEvent.Cause)} on the toggle button
* selected in the group.
* In all other cases the result of the method is the same as calling
* {@link Component#requestFocus(FocusEvent.Cause)} on this toggle button.
*
* @param cause the cause why the focus is requested
* @see ButtonGroup
* @see Component#requestFocus(FocusEvent.Cause)
* @see FocusEvent.Cause
*
* @since 9
*/
@Override
public void requestFocus(FocusEvent.Cause cause) {
getGroupSelection(cause).requestFocusUnconditionally(cause);
}
private void requestFocusUnconditionally(FocusEvent.Cause cause) {
super.requestFocus(cause);
}
/**
* If this toggle button is a member of the {@link ButtonGroup} which has
* another toggle button which is selected and can be the focus owner,
* and the focus cause argument denotes window activation or focus
* traversal action of any direction the result of the method execution
* is the same as calling
* {@link Component#requestFocusInWindow(FocusEvent.Cause)} on the toggle
* button selected in the group.
* In all other cases the result of the method is the same as calling
* {@link Component#requestFocusInWindow(FocusEvent.Cause)} on this toggle
* button.
*
* @param cause the cause why the focus is requested
* @see ButtonGroup
* @see Component#requestFocusInWindow(FocusEvent.Cause)
* @see FocusEvent.Cause
*
* @since 9
*/
public boolean requestFocusInWindow(FocusEvent.Cause cause) {
return getGroupSelection(cause)
.requestFocusInWindowUnconditionally(cause);
}
private boolean requestFocusInWindowUnconditionally(FocusEvent.Cause cause) {
return super.requestFocusInWindow(cause);
}
// *********************************************************************
/**
* The ToggleButton model
* <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}.
*/
@SuppressWarnings("serial") // Same-version serialization only
public static class ToggleButtonModel extends DefaultButtonModel {
/**
* Creates a new ToggleButton Model
*/
public ToggleButtonModel () {
}
/**
* Checks if the button is selected.
*/
public boolean isSelected() {
// if(getGroup() != null) {
// return getGroup().isSelected(this);
// } else {
return (stateMask & SELECTED) != 0;
// }
}
/**
* Sets the selected state of the button.
* @param b true selects the toggle button,
* false deselects the toggle button.
*/
public void setSelected(boolean b) {
ButtonGroup group = getGroup();
if (group != null) {
// use the group model instead
group.setSelected(this, b);
b = group.isSelected(this);
}
if (isSelected() == b) {
return;
}
if (b) {
stateMask |= SELECTED;
} else {
stateMask &= ~SELECTED;
}
// Send ChangeEvent
fireStateChanged();
// Send ItemEvent
fireItemStateChanged(
new ItemEvent(this,
ItemEvent.ITEM_STATE_CHANGED,
this,
this.isSelected() ? ItemEvent.SELECTED : ItemEvent.DESELECTED));
}
/**
* Sets the pressed state of the toggle button.
*/
@SuppressWarnings("deprecation")
public void setPressed(boolean b) {
if ((isPressed() == b) || !isEnabled()) {
return;
}
if (b == false && isArmed()) {
setSelected(!this.isSelected());
}
if (b) {
stateMask |= PRESSED;
} else {
stateMask &= ~PRESSED;
}
fireStateChanged();
if(!isPressed() && isArmed()) {
int modifiers = 0;
AWTEvent currentEvent = EventQueue.getCurrentEvent();
if (currentEvent instanceof InputEvent) {
modifiers = ((InputEvent)currentEvent).getModifiers();
} else if (currentEvent instanceof ActionEvent) {
modifiers = ((ActionEvent)currentEvent).getModifiers();
}
fireActionPerformed(
new ActionEvent(this, ActionEvent.ACTION_PERFORMED,
getActionCommand(),
EventQueue.getMostRecentEventTime(),
modifiers));
}
}
}
/**
* 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);
}
}
}
/**
* Returns a string representation of this JToggleButton. 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 JToggleButton.
*/
protected String paramString() {
return super.paramString();
}
/////////////////
// Accessibility support
////////////////
/**
* Gets the AccessibleContext associated with this JToggleButton.
* For toggle buttons, the AccessibleContext takes the form of an
* AccessibleJToggleButton.
* A new AccessibleJToggleButton instance is created if necessary.
*
* @return an AccessibleJToggleButton that serves as the
* AccessibleContext of this JToggleButton
*/
@BeanProperty(bound = false, expert = true, description
= "The AccessibleContext associated with this ToggleButton.")
public AccessibleContext getAccessibleContext() {
if (accessibleContext == null) {
accessibleContext = new AccessibleJToggleButton();
}
return accessibleContext;
}
/**
* This class implements accessibility support for the
* <code>JToggleButton</code> class. It provides an implementation of the
* Java Accessibility API appropriate to toggle button 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
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