JToolTip (Java 2 Platform SE v1.4.1) - JDK 5 Documentation v1.4.1, Java 2 SDK 英文文档

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Java^TM 2 Platform
Std. Ed. v1.4.1

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javax.swing
Class JToolTip

java.lang.Object
  |
  +--java.awt.Component
        |
        +--java.awt.Container
              |
              +--javax.swing.JComponent
                    |
                    +--javax.swing.JToolTip

All Implemented Interfaces:: Accessible, ImageObserver, MenuContainer, Serializable

public class JToolTip
extends JComponent
implements Accessible

Used to display a "Tip" for a Component. Typically components provide api to automate the process of using ToolTips. For example, any Swing component can use the JComponent setToolTipText method to specify the text for a standard tooltip. A component that wants to create a custom ToolTip display can override JComponent's createToolTip method and use a subclass of this class.

For the keyboard keys used by this component in the standard Look and Feel (L&F) renditions, see the JToolTip key assignments.

See How to Use Tool Tips in The Java Tutorial for further documentation.

Warning: 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^TM has been added to the java.beans package. Please see XMLEncoder.

See Also:: JComponent.setToolTipText(java.lang.String), JComponent.createToolTip()

Constructor Detail

JToolTip

public JToolTip()

Creates a tool tip.

Method Detail

getUI

public ToolTipUI getUI()

Returns the L&F object that renders this component.

Returns:: the ToolTipUI object that renders this component

updateUI

public void updateUI()

Resets the UI property to a value from the current look and feel.

Overrides:: updateUI in class JComponent

See Also:: JComponent.updateUI()

getUIClassID

public String getUIClassID()

Returns the name of the L&F class that renders this component.

Overrides:: getUIClassID in class JComponent

Returns:: the string "ToolTipUI"
See Also:: JComponent.getUIClassID(), UIDefaults.getUI(javax.swing.JComponent)

setTipText

public void setTipText(String tipText)

Sets the text to show when the tool tip is displayed. The string tipText may be null.

Parameters:: tipText - the String to display

getTipText

public String getTipText()

Returns the text that is shown when the tool tip is displayed. The returned value may be null.

Returns:: the String that is displayed

setComponent

public void setComponent(JComponent c)

Specifies the component that the tooltip describes. The component c may be null and will have no effect.

This is a bound property.

Parameters:: c - the JComponent being described
See Also:: JComponent.createToolTip()

getComponent

public JComponent getComponent()

Returns the component the tooltip applies to. The returned value may be null.

Returns:: the component that the tooltip describes
See Also:: JComponent.createToolTip()

paramString

protected String paramString()

Returns a string representation of this JToolTip. 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 null.

Overrides:: paramString in class JComponent

Returns:: a string representation of this JToolTip

getAccessibleContext

public AccessibleContext getAccessibleContext()

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.

Specified by:: getAccessibleContext in interface Accessible
Overrides:: getAccessibleContext in class JComponent

Returns:: an AccessibleJToolTip that serves as the AccessibleContext of this JToolTip