List.AccessibleAWTList.AccessibleAWTListChild (Java 2 Platform SE 5.0) - JDK 5 Documentation v1.5.0, Java 2 SDK 英文文档

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Java^TM 2 Platform
Standard Ed. 5.0

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java.awt
Class List.AccessibleAWTList.AccessibleAWTListChild

java.lang.Object
  javax.accessibility.AccessibleContext
      java.awt.Component.AccessibleAWTComponent
          java.awt.List.AccessibleAWTList.AccessibleAWTListChild

All Implemented Interfaces:: Serializable, Accessible, AccessibleComponent

Enclosing class:: List.AccessibleAWTList

protected class List.AccessibleAWTList.AccessibleAWTListChild
extends Component.AccessibleAWTComponent
implements Accessible
extends Component.AccessibleAWTComponent
implements Accessible

This class implements accessibility support for List children. It provides an implementation of the Java Accessibility API appropriate to list children user-interface elements.

See Also:: Serialized Form

Nested Class Summary

Nested classes/interfaces inherited from class java.awt.Component.AccessibleAWTComponent

Component.AccessibleAWTComponent.AccessibleAWTComponentHandler, Component.AccessibleAWTComponent.AccessibleAWTFocusHandler

Field Summary

Fields inherited from class java.awt.Component.AccessibleAWTComponent

accessibleAWTComponentHandler, accessibleAWTFocusHandler

Fields inherited from class javax.accessibility.AccessibleContext

ACCESSIBLE_ACTION_PROPERTY, ACCESSIBLE_ACTIVE_DESCENDANT_PROPERTY, ACCESSIBLE_CARET_PROPERTY, ACCESSIBLE_CHILD_PROPERTY, ACCESSIBLE_COMPONENT_BOUNDS_CHANGED, ACCESSIBLE_DESCRIPTION_PROPERTY, ACCESSIBLE_HYPERTEXT_OFFSET, ACCESSIBLE_INVALIDATE_CHILDREN, ACCESSIBLE_NAME_PROPERTY, ACCESSIBLE_SELECTION_PROPERTY, ACCESSIBLE_STATE_PROPERTY, ACCESSIBLE_TABLE_CAPTION_CHANGED, ACCESSIBLE_TABLE_COLUMN_DESCRIPTION_CHANGED, ACCESSIBLE_TABLE_COLUMN_HEADER_CHANGED, ACCESSIBLE_TABLE_MODEL_CHANGED, ACCESSIBLE_TABLE_ROW_DESCRIPTION_CHANGED, ACCESSIBLE_TABLE_ROW_HEADER_CHANGED, ACCESSIBLE_TABLE_SUMMARY_CHANGED, ACCESSIBLE_TEXT_ATTRIBUTES_CHANGED, ACCESSIBLE_TEXT_PROPERTY, ACCESSIBLE_VALUE_PROPERTY, ACCESSIBLE_VISIBLE_DATA_PROPERTY, accessibleDescription, accessibleName, accessibleParent

Constructor Summary

List.AccessibleAWTList.AccessibleAWTListChild(List parent, int indexInParent)


Method Summary

void addFocusListener(FocusListener l)
          Adds the specified focus listener to receive focus events from this component.

boolean contains(Point p)
          Checks whether the specified point is within this object's bounds, where the point's x and y coordinates are defined to be relative to the coordinate system of the object.

Accessible getAccessibleAt(Point p)
          Returns the Accessible child, if one exists, contained at the local coordinate Point.

Accessible getAccessibleChild(int i)
          Return the specified Accessible child of the object.

int getAccessibleChildrenCount()
          Returns the number of accessible children of the object.

AccessibleContext getAccessibleContext()
          Gets the AccessibleContext for this object.

int getAccessibleIndexInParent()
          Get the 0-based index of this object in its accessible parent.

AccessibleRole getAccessibleRole()
          Get the role of this object.

AccessibleStateSet getAccessibleStateSet()
          Get the state set of this object.

Color getBackground()
          Get the background color of this object.

Rectangle getBounds()
          Gets the bounds of this object in the form of a Rectangle object.

Cursor getCursor()
          Get the Cursor of this object.

Font getFont()
          Get the Font of this object.

FontMetrics getFontMetrics(Font f)
          Get the FontMetrics of this object.

Color getForeground()
          Get the foreground color of this object.

Locale getLocale()
          Gets the locale of the component.

Point getLocation()
          Gets the location of the object relative to the parent in the form of a point specifying the object's top-left corner in the screen's coordinate space.

Point getLocationOnScreen()
          Returns the location of the object on the screen.

Dimension getSize()
          Returns the size of this object in the form of a Dimension object.

boolean isEnabled()
          Determine if the object is enabled.

boolean isFocusTraversable()
          Returns whether this object can accept focus or not.

boolean isShowing()
          Determine if the object is showing.

boolean isVisible()
          Determine if the object is visible.

void removeFocusListener(FocusListener l)
          Removes the specified focus listener so it no longer receives focus events from this component.

void requestFocus()
          Requests focus for this object.

void setBackground(Color c)
          Set the background color of this object.

void setBounds(Rectangle r)
          Sets the bounds of this object in the form of a Rectangle object.

void setCursor(Cursor cursor)
          Set the Cursor of this object.

void setEnabled(boolean b)
          Set the enabled state of the object.

void setFont(Font f)
          Set the Font of this object.

void setForeground(Color c)
          Set the foreground color of this object.

void setLocation(Point p)
          Sets the location of the object relative to the parent.

void setSize(Dimension d)
          Resizes this object so that it has width and height.

void setVisible(boolean b)
          Set the visible state of the object.

Methods inherited from class java.awt.Component.AccessibleAWTComponent

addPropertyChangeListener, getAccessibleComponent, getAccessibleDescription, getAccessibleName, getAccessibleParent, removePropertyChangeListener

Methods inherited from class javax.accessibility.AccessibleContext

firePropertyChange, getAccessibleAction, getAccessibleEditableText, getAccessibleIcon, getAccessibleRelationSet, getAccessibleSelection, getAccessibleTable, getAccessibleText, getAccessibleValue, setAccessibleDescription, setAccessibleName, setAccessibleParent

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Nested classes/interfaces inherited from class java.awt.Component.AccessibleAWTComponent
`Component.AccessibleAWTComponent.AccessibleAWTComponentHandler, Component.AccessibleAWTComponent.AccessibleAWTFocusHandler`

Fields inherited from class java.awt.Component.AccessibleAWTComponent
`accessibleAWTComponentHandler, accessibleAWTFocusHandler`

Fields inherited from class javax.accessibility.AccessibleContext
ACCESSIBLE_ACTION_PROPERTY, ACCESSIBLE_ACTIVE_DESCENDANT_PROPERTY, ACCESSIBLE_CARET_PROPERTY, ACCESSIBLE_CHILD_PROPERTY, ACCESSIBLE_COMPONENT_BOUNDS_CHANGED, ACCESSIBLE_DESCRIPTION_PROPERTY, ACCESSIBLE_HYPERTEXT_OFFSET, ACCESSIBLE_INVALIDATE_CHILDREN, ACCESSIBLE_NAME_PROPERTY, ACCESSIBLE_SELECTION_PROPERTY, ACCESSIBLE_STATE_PROPERTY, ACCESSIBLE_TABLE_CAPTION_CHANGED, ACCESSIBLE_TABLE_COLUMN_DESCRIPTION_CHANGED, ACCESSIBLE_TABLE_COLUMN_HEADER_CHANGED, ACCESSIBLE_TABLE_MODEL_CHANGED, ACCESSIBLE_TABLE_ROW_DESCRIPTION_CHANGED, ACCESSIBLE_TABLE_ROW_HEADER_CHANGED, ACCESSIBLE_TABLE_SUMMARY_CHANGED, ACCESSIBLE_TEXT_ATTRIBUTES_CHANGED, ACCESSIBLE_TEXT_PROPERTY, ACCESSIBLE_VALUE_PROPERTY, ACCESSIBLE_VISIBLE_DATA_PROPERTY, accessibleDescription, accessibleName, accessibleParent

Constructor Summary
`List.AccessibleAWTList.AccessibleAWTListChild(List parent, int indexInParent)`

Method Summary
`void`	`addFocusListener(FocusListener l)` Adds the specified focus listener to receive focus events from this component.
`boolean`	`contains(Point p)` Checks whether the specified point is within this object's bounds, where the point's x and y coordinates are defined to be relative to the coordinate system of the object.
`Accessible`	`getAccessibleAt(Point p)` Returns the `Accessible` child, if one exists, contained at the local coordinate `Point`.
`Accessible`	`getAccessibleChild(int i)` Return the specified Accessible child of the object.
`int`	`getAccessibleChildrenCount()` Returns the number of accessible children of the object.
`AccessibleContext`	`getAccessibleContext()` Gets the AccessibleContext for this object.
`int`	`getAccessibleIndexInParent()` Get the 0-based index of this object in its accessible parent.
`AccessibleRole`	`getAccessibleRole()` Get the role of this object.
`AccessibleStateSet`	`getAccessibleStateSet()` Get the state set of this object.
`Color`	`getBackground()` Get the background color of this object.
`Rectangle`	`getBounds()` Gets the bounds of this object in the form of a Rectangle object.
`Cursor`	`getCursor()` Get the Cursor of this object.
`Font`	`getFont()` Get the Font of this object.
`FontMetrics`	`getFontMetrics(Font f)` Get the FontMetrics of this object.
`Color`	`getForeground()` Get the foreground color of this object.
`Locale`	`getLocale()` Gets the locale of the component.
`Point`	`getLocation()` Gets the location of the object relative to the parent in the form of a point specifying the object's top-left corner in the screen's coordinate space.
`Point`	`getLocationOnScreen()` Returns the location of the object on the screen.
`Dimension`	`getSize()` Returns the size of this object in the form of a Dimension object.
`boolean`	`isEnabled()` Determine if the object is enabled.
`boolean`	`isFocusTraversable()` Returns whether this object can accept focus or not.
`boolean`	`isShowing()` Determine if the object is showing.
`boolean`	`isVisible()` Determine if the object is visible.
`void`	`removeFocusListener(FocusListener l)` Removes the specified focus listener so it no longer receives focus events from this component.
`void`	`requestFocus()` Requests focus for this object.
`void`	`setBackground(Color c)` Set the background color of this object.
`void`	`setBounds(Rectangle r)` Sets the bounds of this object in the form of a Rectangle object.
`void`	`setCursor(Cursor cursor)` Set the Cursor of this object.
`void`	`setEnabled(boolean b)` Set the enabled state of the object.
`void`	`setFont(Font f)` Set the Font of this object.
`void`	`setForeground(Color c)` Set the foreground color of this object.
`void`	`setLocation(Point p)` Sets the location of the object relative to the parent.
`void`	`setSize(Dimension d)` Resizes this object so that it has width and height.
`void`	`setVisible(boolean b)` Set the visible state of the object.

Methods inherited from class java.awt.Component.AccessibleAWTComponent
`addPropertyChangeListener, getAccessibleComponent, getAccessibleDescription, getAccessibleName, getAccessibleParent, removePropertyChangeListener`

Methods inherited from class javax.accessibility.AccessibleContext
`firePropertyChange, getAccessibleAction, getAccessibleEditableText, getAccessibleIcon, getAccessibleRelationSet, getAccessibleSelection, getAccessibleTable, getAccessibleText, getAccessibleValue, setAccessibleDescription, setAccessibleName, setAccessibleParent`

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Constructor Detail

List.AccessibleAWTList.AccessibleAWTListChild

public List.AccessibleAWTList.AccessibleAWTListChild(List parent,
                                                     int indexInParent)

Method Detail

getAccessibleContext

public AccessibleContext getAccessibleContext()

Gets the AccessibleContext for this object. In the implementation of the Java Accessibility API for this class, return this object, which acts as its own AccessibleContext.

Specified by:: getAccessibleContext in interface Accessible

Returns:: this object

getAccessibleRole

public AccessibleRole getAccessibleRole()

Get the role of this object.

Overrides:: getAccessibleRole in class Component.AccessibleAWTComponent

Returns:: an instance of AccessibleRole describing the role of the object
See Also:: AccessibleRole

getAccessibleStateSet

public AccessibleStateSet getAccessibleStateSet()

Get the state set of this object. The AccessibleStateSet of an object is composed of a set of unique AccessibleState's. A change in the AccessibleStateSet of an object will cause a PropertyChangeEvent to be fired for the ACCESSIBLE_STATE_PROPERTY property.

Overrides:: getAccessibleStateSet in class Component.AccessibleAWTComponent

Returns:: an instance of AccessibleStateSet containing the current state set of the object
See Also:: AccessibleStateSet, AccessibleState, Component.AccessibleAWTComponent.addPropertyChangeListener(java.beans.PropertyChangeListener)

getLocale

public Locale getLocale()

Gets the locale of the component. If the component does not have a locale, then the locale of its parent is returned.

Overrides:: getLocale in class Component.AccessibleAWTComponent

Returns:: This component's locale. If this component does not have a locale, the locale of its parent is returned.
Throws:: IllegalComponentStateException - If the Component does not have its own locale and has not yet been added to a containment hierarchy such that the locale can be determined from the containing parent.

getAccessibleIndexInParent

public int getAccessibleIndexInParent()

Get the 0-based index of this object in its accessible parent.

Overrides:: getAccessibleIndexInParent in class Component.AccessibleAWTComponent

Returns:: the 0-based index of this object in its parent; -1 if this object does not have an accessible parent.
See Also:: Component.AccessibleAWTComponent.getAccessibleParent(), getAccessibleChildrenCount(), getAccessibleChild(int)

getAccessibleChildrenCount

public int getAccessibleChildrenCount()

Returns the number of accessible children of the object.

Overrides:: getAccessibleChildrenCount in class Component.AccessibleAWTComponent

Returns:: the number of accessible children of the object.

getAccessibleChild

public Accessible getAccessibleChild(int i)

Return the specified Accessible child of the object. The Accessible children of an Accessible object are zero-based, so the first child of an Accessible child is at index 0, the second child is at index 1, and so on.

Overrides:: getAccessibleChild in class Component.AccessibleAWTComponent

Parameters:: i - zero-based index of child
Returns:: the Accessible child of the object
See Also:: getAccessibleChildrenCount()

getBackground

public Color getBackground()

Get the background color of this object.

Specified by:: getBackground in interface AccessibleComponent
Overrides:: getBackground in class Component.AccessibleAWTComponent

Returns:: the background color, if supported, of the object; otherwise, null
See Also:: setBackground(java.awt.Color)

setBackground

public void setBackground(Color c)

Set the background color of this object.

Specified by:: setBackground in interface AccessibleComponent
Overrides:: setBackground in class Component.AccessibleAWTComponent

Parameters:: c - the new Color for the background
See Also:: setBackground(java.awt.Color)

getForeground

public Color getForeground()

Get the foreground color of this object.

Specified by:: getForeground in interface AccessibleComponent
Overrides:: getForeground in class Component.AccessibleAWTComponent

Returns:: the foreground color, if supported, of the object; otherwise, null
See Also:: setForeground(java.awt.Color)

setForeground

public void setForeground(Color c)

Set the foreground color of this object.

Specified by:: setForeground in interface AccessibleComponent
Overrides:: setForeground in class Component.AccessibleAWTComponent

Parameters:: c - the new Color for the foreground
See Also:: getForeground()

getCursor

public Cursor getCursor()

Get the Cursor of this object.

Specified by:: getCursor in interface AccessibleComponent
Overrides:: getCursor in class Component.AccessibleAWTComponent

Returns:: the Cursor, if supported, of the object; otherwise, null
See Also:: setCursor(java.awt.Cursor)

setCursor

public void setCursor(Cursor cursor)

Set the Cursor of this object.

Specified by:: setCursor in interface AccessibleComponent
Overrides:: setCursor in class Component.AccessibleAWTComponent

Parameters:: cursor - the new Cursor for the object
See Also:: getCursor()

getFont

public Font getFont()

Get the Font of this object.

Specified by:: getFont in interface AccessibleComponent
Overrides:: getFont in class Component.AccessibleAWTComponent

Returns:: the Font,if supported, for the object; otherwise, null
See Also:: setFont(java.awt.Font)

setFont

public void setFont(Font f)

Set the Font of this object.

Specified by:: setFont in interface AccessibleComponent
Overrides:: setFont in class Component.AccessibleAWTComponent

Parameters:: f - the new Font for the object
See Also:: getFont()

getFontMetrics

public FontMetrics getFontMetrics(Font f)

Get the FontMetrics of this object.

Specified by:: getFontMetrics in interface AccessibleComponent
Overrides:: getFontMetrics in class Component.AccessibleAWTComponent

Parameters:: f - the Font
Returns:: the FontMetrics, if supported, the object; otherwise, null
See Also:: getFont()

isEnabled

public boolean isEnabled()

Determine if the object is enabled. Objects that are enabled will also have the AccessibleState.ENABLED state set in their AccessibleStateSet.

Specified by:: isEnabled in interface AccessibleComponent
Overrides:: isEnabled in class Component.AccessibleAWTComponent

Returns:: true if object is enabled; otherwise, false
See Also:: setEnabled(boolean), AccessibleContext.getAccessibleStateSet(), AccessibleState.ENABLED, AccessibleStateSet

setEnabled

public void setEnabled(boolean b)

Set the enabled state of the object.

Specified by:: setEnabled in interface AccessibleComponent
Overrides:: setEnabled in class Component.AccessibleAWTComponent

Parameters:: b - if true, enables this object; otherwise, disables it
See Also:: isEnabled()

isVisible

public boolean isVisible()

Determine if the object is visible. Note: this means that the object intends to be visible; however, it may not be showing on the screen because one of the objects that this object is contained by is currently not visible. To determine if an object is showing on the screen, use isShowing().

Objects that are visible will also have the AccessibleState.VISIBLE state set in their AccessibleStateSet.

Specified by:: isVisible in interface AccessibleComponent
Overrides:: isVisible in class Component.AccessibleAWTComponent

Returns:: true if object is visible; otherwise, false
See Also:: setVisible(boolean), AccessibleContext.getAccessibleStateSet(), AccessibleState.VISIBLE, AccessibleStateSet

setVisible

public void setVisible(boolean b)

Set the visible state of the object.

Specified by:: setVisible in interface AccessibleComponent
Overrides:: setVisible in class Component.AccessibleAWTComponent

Parameters:: b - if true, shows this object; otherwise, hides it
See Also:: isVisible()

isShowing

public boolean isShowing()

Determine if the object is showing. This is determined by checking the visibility of the object and visibility of the object ancestors. Note: this will return true even if the object is obscured by another (for example, it to object is underneath a menu that was pulled down).

Specified by:: isShowing in interface AccessibleComponent
Overrides:: isShowing in class Component.AccessibleAWTComponent

Returns:: true if object is showing; otherwise, false

contains

public boolean contains(Point p)

Checks whether the specified point is within this object's bounds, where the point's x and y coordinates are defined to be relative to the coordinate system of the object.

Specified by:: contains in interface AccessibleComponent
Overrides:: contains in class Component.AccessibleAWTComponent

Parameters:: p - the Point relative to the coordinate system of the object
Returns:: true if object contains Point; otherwise false
See Also:: getBounds()

getLocationOnScreen

public Point getLocationOnScreen()

Returns the location of the object on the screen.

Specified by:: getLocationOnScreen in interface AccessibleComponent
Overrides:: getLocationOnScreen in class Component.AccessibleAWTComponent

Returns:: location of object on screen; null if this object is not on the screen
See Also:: getBounds(), getLocation()

getLocation

public Point getLocation()

Gets the location of the object relative to the parent in the form of a point specifying the object's top-left corner in the screen's coordinate space.

Specified by:: getLocation in interface AccessibleComponent
Overrides:: getLocation in class Component.AccessibleAWTComponent

Returns:: An instance of Point representing the top-left corner of the objects's bounds in the coordinate space of the screen; null if this object or its parent are not on the screen
See Also:: getBounds(), getLocationOnScreen()

setLocation

public void setLocation(Point p)

Sets the location of the object relative to the parent.

Specified by:: setLocation in interface AccessibleComponent
Overrides:: setLocation in class Component.AccessibleAWTComponent

Parameters:: p - the new position for the top-left corner
See Also:: getLocation()

getBounds

public Rectangle getBounds()

Gets the bounds of this object in the form of a Rectangle object. The bounds specify this object's width, height, and location relative to its parent.

Specified by:: getBounds in interface AccessibleComponent
Overrides:: getBounds in class Component.AccessibleAWTComponent

Returns:: A rectangle indicating this component's bounds; null if this object is not on the screen.
See Also:: contains(java.awt.Point)

setBounds

public void setBounds(Rectangle r)

Sets the bounds of this object in the form of a Rectangle object. The bounds specify this object's width, height, and location relative to its parent.

Specified by:: setBounds in interface AccessibleComponent
Overrides:: setBounds in class Component.AccessibleAWTComponent

Parameters:: r - rectangle indicating this component's bounds
See Also:: getBounds()

getSize

public Dimension getSize()

Returns the size of this object in the form of a Dimension object. The height field of the Dimension object contains this objects's height, and the width field of the Dimension object contains this object's width.

Specified by:: getSize in interface AccessibleComponent
Overrides:: getSize in class Component.AccessibleAWTComponent

Returns:: A Dimension object that indicates the size of this component; null if this object is not on the screen
See Also:: setSize(java.awt.Dimension)

setSize

public void setSize(Dimension d)

Resizes this object so that it has width and height.

Specified by:: setSize in interface AccessibleComponent
Overrides:: setSize in class Component.AccessibleAWTComponent

Parameters:: d - - The dimension specifying the new size of the object.
See Also:: getSize()

getAccessibleAt

public Accessible getAccessibleAt(Point p)

Returns the Accessible child, if one exists, contained at the local coordinate Point.

Specified by:: getAccessibleAt in interface AccessibleComponent
Overrides:: getAccessibleAt in class Component.AccessibleAWTComponent

Parameters:: p - the point relative to the coordinate system of this object
Returns:: the Accessible, if it exists, at the specified location; otherwise null

isFocusTraversable

public boolean isFocusTraversable()

Returns whether this object can accept focus or not. Objects that can accept focus will also have the AccessibleState.FOCUSABLE state set in their AccessibleStateSet.

Specified by:: isFocusTraversable in interface AccessibleComponent
Overrides:: isFocusTraversable in class Component.AccessibleAWTComponent

Returns:: true if object can accept focus; otherwise false
See Also:: AccessibleContext.getAccessibleStateSet(), AccessibleState.FOCUSABLE, AccessibleState.FOCUSED, AccessibleStateSet

requestFocus

public void requestFocus()

Requests focus for this object. If this object cannot accept focus, nothing will happen. Otherwise, the object will attempt to take focus.

Specified by:: requestFocus in interface AccessibleComponent
Overrides:: requestFocus in class Component.AccessibleAWTComponent

See Also:: isFocusTraversable()

addFocusListener

public void addFocusListener(FocusListener l)

Adds the specified focus listener to receive focus events from this component.

Specified by:: addFocusListener in interface AccessibleComponent
Overrides:: addFocusListener in class Component.AccessibleAWTComponent

Parameters:: l - the focus listener
See Also:: removeFocusListener(java.awt.event.FocusListener)

removeFocusListener

public void removeFocusListener(FocusListener l)

Removes the specified focus listener so it no longer receives focus events from this component.

Specified by:: removeFocusListener in interface AccessibleComponent
Overrides:: removeFocusListener in class Component.AccessibleAWTComponent

Parameters:: l - the focus listener
See Also:: addFocusListener(java.awt.event.FocusListener)