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JavaTM 2 Platform Std. Ed. v1.6.0
java.awt
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Nested Class Summary | |
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protected class |
TextField.AccessibleAWTTextField
This class implements accessibility support for the TextField class. |
Nested classes/interfaces inherited from class java.awt.TextComponent |
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TextComponent.AccessibleAWTTextComponent |
Nested classes/interfaces inherited from class java.awt.Component |
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Component.AccessibleAWTComponent, Component.BaselineResizeBehavior, Component.BltBufferStrategy, Component.FlipBufferStrategy |
Field Summary |
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Fields inherited from class java.awt.TextComponent |
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textListener |
Fields inherited from class java.awt.Component |
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BOTTOM_ALIGNMENT, CENTER_ALIGNMENT, LEFT_ALIGNMENT, RIGHT_ALIGNMENT, TOP_ALIGNMENT |
Fields inherited from interface java.awt.image.ImageObserver |
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ABORT, ALLBITS, ERROR, FRAMEBITS, HEIGHT, PROPERTIES, SOMEBITS, WIDTH |
Constructor Summary | |
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TextField()
Constructs a new text field. |
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TextField(int columns)
Constructs a new empty text field with the specified number of columns. |
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TextField(String text)
Constructs a new text field initialized with the specified text. |
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TextField(String text,
int columns)
Constructs a new text field initialized with the specified text to be displayed, and wide enough to hold the specified number of columns. |
Method Summary | ||
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void |
addActionListener(ActionListener l)
Adds the specified action listener to receive action events from this text field. |
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void |
addNotify()
Creates the TextField's peer. |
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boolean |
echoCharIsSet()
Indicates whether or not this text field has a character set for echoing. |
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AccessibleContext |
getAccessibleContext()
Gets the AccessibleContext associated with this TextField. |
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ActionListener[] |
getActionListeners()
Returns an array of all the action listeners registered on this textfield. |
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int |
getColumns()
Gets the number of columns in this text field. |
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char |
getEchoChar()
Gets the character that is to be used for echoing. |
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getListeners(Class<T> listenerType)
Returns an array of all the objects currently registered as FooListener s
upon this TextField . |
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Dimension |
getMinimumSize()
Gets the minumum dimensions for this text field. |
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Dimension |
getMinimumSize(int columns)
Gets the minumum dimensions for a text field with the specified number of columns. |
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Dimension |
getPreferredSize()
Gets the preferred size of this text field. |
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Dimension |
getPreferredSize(int columns)
Gets the preferred size of this text field with the specified number of columns. |
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Dimension |
minimumSize()
Deprecated. As of JDK version 1.1, replaced by getMinimumSize() . |
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Dimension |
minimumSize(int columns)
Deprecated. As of JDK version 1.1, replaced by getMinimumSize(int) . |
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protected String |
paramString()
Returns a string representing the state of this TextField . |
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Dimension |
preferredSize()
Deprecated. As of JDK version 1.1, replaced by getPreferredSize() . |
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Dimension |
preferredSize(int columns)
Deprecated. As of JDK version 1.1, replaced by getPreferredSize(int) . |
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protected void |
processActionEvent(ActionEvent e)
Processes action events occurring on this text field by dispatching them to any registered ActionListener objects. |
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protected void |
processEvent(AWTEvent e)
Processes events on this text field. |
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void |
removeActionListener(ActionListener l)
Removes the specified action listener so that it no longer receives action events from this text field. |
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void |
setColumns(int columns)
Sets the number of columns in this text field. |
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void |
setEchoChar(char c)
Sets the echo character for this text field. |
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void |
setEchoCharacter(char c)
Deprecated. As of JDK version 1.1, replaced by setEchoChar(char) . |
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void |
setText(String t)
Sets the text that is presented by this text component to be the specified text. |
Methods inherited from class java.awt.TextComponent |
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addTextListener, enableInputMethods, getBackground, getCaretPosition, getInputMethodRequests, getSelectedText, getSelectionEnd, getSelectionStart, getText, getTextListeners, isEditable, processTextEvent, removeNotify, removeTextListener, select, selectAll, setBackground, setCaretPosition, setEditable, setSelectionEnd, setSelectionStart |
Methods inherited from class java.lang.Object |
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clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait |
Constructor Detail |
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public TextField() throws HeadlessException
HeadlessException
- if GraphicsEnvironment.isHeadless()
returns true.GraphicsEnvironment.isHeadless()
public TextField(String text) throws HeadlessException
text
- the text to be displayed. If
text
is null
, the empty
string ""
will be displayed.
HeadlessException
- if GraphicsEnvironment.isHeadless()
returns true.GraphicsEnvironment.isHeadless()
public TextField(int columns) throws HeadlessException
columns
- the number of columns. If
columns
is less than 0
,
columns
is set to 0
.
HeadlessException
- if GraphicsEnvironment.isHeadless()
returns true.GraphicsEnvironment.isHeadless()
public TextField(String text, int columns) throws HeadlessException
text
- the text to be displayed. If
text
is null
, the empty
string ""
will be displayed.columns
- the number of columns. If
columns
is less than 0
,
columns
is set to 0
.
HeadlessException
- if GraphicsEnvironment.isHeadless()
returns true.GraphicsEnvironment.isHeadless()
Method Detail |
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public void addNotify()
addNotify
in class TextComponent
TextComponent.removeNotify()
public char getEchoChar()
An echo character is useful for text fields where
user input should not be echoed to the screen, as in
the case of a text field for entering a password.
If echoChar
= 0
, user
input is echoed to the screen unchanged.
A Java platform implementation may support only a limited, non-empty set of echo characters. This function returns the echo character originally requested via setEchoChar(). The echo character actually used by the TextField implementation might be different.
echoCharIsSet()
,
setEchoChar(char)
public void setEchoChar(char c)
An echo character is useful for text fields where
user input should not be echoed to the screen, as in
the case of a text field for entering a password.
Setting echoChar
= 0
allows
user input to be echoed to the screen again.
A Java platform implementation may support only a limited, non-empty set of echo characters. Attempts to set an unsupported echo character will cause the default echo character to be used instead. Subsequent calls to getEchoChar() will return the echo character originally requested. This might or might not be identical to the echo character actually used by the TextField implementation.
c
- the echo character for this text field.echoCharIsSet()
,
getEchoChar()
@Deprecated public void setEchoCharacter(char c)
setEchoChar(char)
.
public void setText(String t)
setText
in class TextComponent
t
- the new text.TextComponent.getText()
public boolean echoCharIsSet()
An echo character is useful for text fields where user input should not be echoed to the screen, as in the case of a text field for entering a password.
true
if this text field has
a character set for echoing;
false
otherwise.setEchoChar(char)
,
getEchoChar()
public int getColumns()
setColumns(int)
public void setColumns(int columns)
columns
- the number of columns.
IllegalArgumentException
- if the value
supplied for columns
is less than 0
.getColumns()
public Dimension getPreferredSize(int columns)
columns
- the number of columns
in this text field.
@Deprecated public Dimension preferredSize(int columns)
getPreferredSize(int)
.
public Dimension getPreferredSize()
getPreferredSize
in class Component
Component.getMinimumSize()
,
LayoutManager
@Deprecated public Dimension preferredSize()
getPreferredSize()
.
preferredSize
in class Component
public Dimension getMinimumSize(int columns)
columns
- the number of columns in
this text field.@Deprecated public Dimension minimumSize(int columns)
getMinimumSize(int)
.
public Dimension getMinimumSize()
getMinimumSize
in class Component
Component.getPreferredSize()
,
LayoutManager
@Deprecated public Dimension minimumSize()
getMinimumSize()
.
minimumSize
in class Component
public void addActionListener(ActionListener l)
Refer to AWT Threading Issues for details on AWT's threading model.
l
- the action listener.removeActionListener(java.awt.event.ActionListener)
,
getActionListeners()
,
ActionListener
public void removeActionListener(ActionListener l)
Refer to AWT Threading Issues for details on AWT's threading model.
l
- the action listener.addActionListener(java.awt.event.ActionListener)
,
getActionListeners()
,
ActionListener
public ActionListener[] getActionListeners()
ActionListener
s
or an empty array if no action
listeners are currently registeredaddActionListener(java.awt.event.ActionListener)
,
removeActionListener(java.awt.event.ActionListener)
,
java.awt.event
public <T extends EventListener> T[] getListeners(Class<T> listenerType)
FooListener
s
upon this TextField
.
FooListener
s are registered using the
addFooListener
method.
You can specify the listenerType
argument
with a class literal, such as
FooListener.class
.
For example, you can query a
TextField
t
for its action listeners with the following code:
ActionListener[] als = (ActionListener[])(t.getListeners(ActionListener.class));If no such listeners exist, this method returns an empty array.
getListeners
in class TextComponent
listenerType
- the type of listeners requested; this parameter
should specify an interface that descends from
java.util.EventListener
FooListener
s on this textfield,
or an empty array if no such
listeners have been added
ClassCastException
- if listenerType
doesn't specify a class or interface that implements
java.util.EventListener
getActionListeners()
protected void processEvent(AWTEvent e)
ActionEvent
,
it invokes the processActionEvent
method. Otherwise, it invokes processEvent
on the superclass.
Note that if the event parameter is null
the behavior is unspecified and may result in an
exception.
processEvent
in class TextComponent
e
- the eventActionEvent
,
processActionEvent(java.awt.event.ActionEvent)
protected void processActionEvent(ActionEvent e)
ActionListener
objects.
This method is not called unless action events are enabled for this component. Action events are enabled when one of the following occurs:
ActionListener
object is registered
via addActionListener
.
enableEvents
.
Note that if the event parameter is null
the behavior is unspecified and may result in an
exception.
e
- the action eventActionListener
,
addActionListener(java.awt.event.ActionListener)
,
Component.enableEvents(long)
protected String paramString()
TextField
.
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
.
paramString
in class TextComponent
public AccessibleContext getAccessibleContext()
getAccessibleContext
in interface Accessible
getAccessibleContext
in class TextComponent