/*
* Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved.
* ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
*
*
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*
*/
package javax.swing;
import javax.swing.plaf.*;
import javax.accessibility.*;
import java.io.
ObjectOutputStream;
import java.io.
ObjectInputStream;
import java.io.
IOException;
import java.util.
Objects;
/**
* Used to display a "Tip" for a Component. Typically components provide api
* to automate the process of using <code>ToolTip</code>s.
* For example, any Swing component can use the <code>JComponent</code>
* <code>setToolTipText</code> method to specify the text
* for a standard tooltip. A component that wants to create a custom
* <code>ToolTip</code>
* display can override <code>JComponent</code>'s <code>createToolTip</code>
* method and use a subclass of this class.
* <p>
* See <a href="https://docs.oracle.com/javase/tutorial/uiswing/components/tooltip.html">How to Use Tool Tips</a>
* in <em>The Java Tutorial</em>
* for further documentation.
* <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 JComponent#setToolTipText
* @see JComponent#createToolTip
* @author Dave Moore
* @author Rich Shiavi
*/
@
SuppressWarnings("serial")
public class
JToolTip extends
JComponent implements
Accessible {
/**
* @see #getUIClassID
* @see #readObject
*/
private static final
String uiClassID = "ToolTipUI";
String tipText;
JComponent component;
/** Creates a tool tip. */
public
JToolTip() {
setOpaque(true);
updateUI();
}
/**
* Returns the L&F object that renders this component.
*
* @return the <code>ToolTipUI</code> object that renders this component
*/
public
ToolTipUI getUI() {
return (
ToolTipUI)
ui;
}
/**
* Resets the UI property to a value from the current look and feel.
*
* @see JComponent#updateUI
*/
public void
updateUI() {
setUI((
ToolTipUI)
UIManager.
getUI(this));
}
/**
* Returns the name of the L&F class that renders this component.
*
* @return the string "ToolTipUI"
* @see JComponent#getUIClassID
* @see UIDefaults#getUI
*/
public
String getUIClassID() {
return
uiClassID;
}
/**
* Sets the text to show when the tool tip is displayed.
* The string <code>tipText</code> may be <code>null</code>.
*
* @param tipText the <code>String</code> to display
* @beaninfo
* preferred: true
* bound: true
* description: Sets the text of the tooltip
*/
public void
setTipText(
String tipText) {
String oldValue = this.
tipText;
this.
tipText =
tipText;
firePropertyChange("tiptext",
oldValue,
tipText);
if (!
Objects.
equals(
oldValue,
tipText)) {
revalidate();
repaint();
}
}
/**
* Returns the text that is shown when the tool tip is displayed.
* The returned value may be <code>null</code>.
*
* @return the <code>String</code> that is displayed
*/
public
String getTipText() {
return
tipText;
}
/**
* Specifies the component that the tooltip describes.
* The component <code>c</code> may be <code>null</code>
* and will have no effect.
* <p>
* This is a bound property.
*
* @param c the <code>JComponent</code> being described
* @see JComponent#createToolTip
* @beaninfo
* bound: true
* description: Sets the component that the tooltip describes.
*/
public void
setComponent(
JComponent c) {
JComponent oldValue = this.
component;
component =
c;
firePropertyChange("component",
oldValue,
c);
}
/**
* Returns the component the tooltip applies to.
* The returned value may be <code>null</code>.
*
* @return the component that the tooltip describes
*
* @see JComponent#createToolTip
*/
public
JComponent getComponent() {
return
component;
}
/**
* Always returns true since tooltips, by definition,
* should always be on top of all other windows.
*/
// package private
boolean
alwaysOnTop() {
return true;
}
/**
* See <code>readObject</code> and <code>writeObject</code>
* in <code>JComponent</code> 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 <code>JToolTip</code>.
* 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 <code>JToolTip</code>
*/
protected
String paramString() {
String tipTextString = (
tipText != null ?
tipText : "");
return super.paramString() +
",tipText=" +
tipTextString;
}
/////////////////
// Accessibility support
////////////////
/**
* Gets the AccessibleContext associated with this JToolTip.
* For tool tips, the AccessibleContext takes the form of an
* AccessibleJToolTip.
* A new AccessibleJToolTip instance is created if necessary.
*
* @return an AccessibleJToolTip that serves as the
* AccessibleContext of this JToolTip
*/
public
AccessibleContext getAccessibleContext() {
if (
accessibleContext == null) {
accessibleContext = new
AccessibleJToolTip();
}
return
accessibleContext;
}
/**
* This class implements accessibility support for the
* <code>JToolTip</code> class. It provides an implementation of the
* Java Accessibility API appropriate to tool tip 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™
* has been added to the <code>java.beans</code> package.
* Please see {@link java.beans.XMLEncoder}.
*/
@
SuppressWarnings("serial")
protected class
AccessibleJToolTip extends
AccessibleJComponent {
/**
* Get the accessible description of this object.
*
* @return a localized String describing this object.
*/
public
String getAccessibleDescription() {
String description =
accessibleDescription;
// fallback to client property
if (
description == null) {
description = (
String)
getClientProperty(
AccessibleContext.
ACCESSIBLE_DESCRIPTION_PROPERTY);
}
if (
description == null) {
description =
getTipText();
}
return
description;
}
/**
* Get the role of this object.
*
* @return an instance of AccessibleRole describing the role of the
* object
*/
public
AccessibleRole getAccessibleRole() {
return
AccessibleRole.
TOOL_TIP;
}
}
}