PaintEvent (Java Platform SE 6) - JDK 5 Documentation v6.0, Java 2 SDK 英文文档

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Java™ Platform
Standard Ed. 6

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java.awt.event
Class PaintEvent

java.lang.Object
  java.util.EventObject
      java.awt.AWTEvent
          java.awt.event.ComponentEvent
              java.awt.event.PaintEvent

All Implemented Interfaces:: Serializable

public class PaintEvent
extends ComponentEvent
extends ComponentEvent

The component-level paint event. This event is a special type which is used to ensure that paint/update method calls are serialized along with the other events delivered from the event queue. This event is not designed to be used with the Event Listener model; programs should continue to override paint/update methods in order render themselves properly.

Since:: 1.1
See Also:: Serialized Form

Field Summary

static int PAINT
          The paint event type.

static int PAINT_FIRST
          Marks the first integer id for the range of paint event ids.

static int PAINT_LAST
          Marks the last integer id for the range of paint event ids.

static int UPDATE
          The update event type.

Fields inherited from class java.awt.event.ComponentEvent

COMPONENT_FIRST, COMPONENT_HIDDEN, COMPONENT_LAST, COMPONENT_MOVED, COMPONENT_RESIZED, COMPONENT_SHOWN

Fields inherited from class java.awt.AWTEvent

ACTION_EVENT_MASK, ADJUSTMENT_EVENT_MASK, COMPONENT_EVENT_MASK, consumed, CONTAINER_EVENT_MASK, FOCUS_EVENT_MASK, HIERARCHY_BOUNDS_EVENT_MASK, HIERARCHY_EVENT_MASK, id, INPUT_METHOD_EVENT_MASK, INVOCATION_EVENT_MASK, ITEM_EVENT_MASK, KEY_EVENT_MASK, MOUSE_EVENT_MASK, MOUSE_MOTION_EVENT_MASK, MOUSE_WHEEL_EVENT_MASK, PAINT_EVENT_MASK, RESERVED_ID_MAX, TEXT_EVENT_MASK, WINDOW_EVENT_MASK, WINDOW_FOCUS_EVENT_MASK, WINDOW_STATE_EVENT_MASK

Fields inherited from class java.util.EventObject

source

Constructor Summary

PaintEvent(Component source, int id, Rectangle updateRect)
          Constructs a PaintEvent object with the specified source component and type.

Method Summary

Rectangle getUpdateRect()
          Returns the rectangle representing the area which needs to be repainted in response to this event.

String paramString()
          Returns a parameter string identifying this event.

void setUpdateRect(Rectangle updateRect)
          Sets the rectangle representing the area which needs to be repainted in response to this event.

Methods inherited from class java.awt.event.ComponentEvent

getComponent

Methods inherited from class java.awt.AWTEvent

consume, getID, isConsumed, setSource, toString

Methods inherited from class java.util.EventObject

getSource

Methods inherited from class java.lang.Object

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

Field Summary
`static int`	`PAINT` The paint event type.
`static int`	`PAINT_FIRST` Marks the first integer id for the range of paint event ids.
`static int`	`PAINT_LAST` Marks the last integer id for the range of paint event ids.
`static int`	`UPDATE` The update event type.

Fields inherited from class java.awt.event.ComponentEvent
`COMPONENT_FIRST, COMPONENT_HIDDEN, COMPONENT_LAST, COMPONENT_MOVED, COMPONENT_RESIZED, COMPONENT_SHOWN`

Fields inherited from class java.awt.AWTEvent
`ACTION_EVENT_MASK, ADJUSTMENT_EVENT_MASK, COMPONENT_EVENT_MASK, consumed, CONTAINER_EVENT_MASK, FOCUS_EVENT_MASK, HIERARCHY_BOUNDS_EVENT_MASK, HIERARCHY_EVENT_MASK, id, INPUT_METHOD_EVENT_MASK, INVOCATION_EVENT_MASK, ITEM_EVENT_MASK, KEY_EVENT_MASK, MOUSE_EVENT_MASK, MOUSE_MOTION_EVENT_MASK, MOUSE_WHEEL_EVENT_MASK, PAINT_EVENT_MASK, RESERVED_ID_MAX, TEXT_EVENT_MASK, WINDOW_EVENT_MASK, WINDOW_FOCUS_EVENT_MASK, WINDOW_STATE_EVENT_MASK`

Fields inherited from class java.util.EventObject
`source`

Constructor Summary
`PaintEvent(Component source, int id, Rectangle updateRect)` Constructs a `PaintEvent` object with the specified source component and type.

Method Summary
`Rectangle`	`getUpdateRect()` Returns the rectangle representing the area which needs to be repainted in response to this event.
`String`	`paramString()` Returns a parameter string identifying this event.
`void`	`setUpdateRect(Rectangle updateRect)` Sets the rectangle representing the area which needs to be repainted in response to this event.

Methods inherited from class java.awt.event.ComponentEvent
`getComponent`

Methods inherited from class java.awt.AWTEvent
`consume, getID, isConsumed, setSource, toString`

Methods inherited from class java.util.EventObject
`getSource`

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

Field Detail

PAINT_FIRST

public static final int PAINT_FIRST

Marks the first integer id for the range of paint event ids.

See Also:: Constant Field Values

PAINT_LAST

public static final int PAINT_LAST

Marks the last integer id for the range of paint event ids.

See Also:: Constant Field Values

PAINT

public static final int PAINT

The paint event type.

See Also:: Constant Field Values

UPDATE

public static final int UPDATE

The update event type.

See Also:: Constant Field Values

Constructor Detail

PaintEvent

public PaintEvent(Component source,
                  int id,
                  Rectangle updateRect)

Constructs a PaintEvent object with the specified source component and type.

Note that passing in an invalid id results in unspecified behavior. This method throws an IllegalArgumentException if source is null.

Parameters:: source - the object where the event originated; id - the event type; updateRect - the rectangle area which needs to be repainted
Throws:: IllegalArgumentException - if source is null

Method Detail

getUpdateRect

public Rectangle getUpdateRect()

Returns the rectangle representing the area which needs to be repainted in response to this event.

setUpdateRect

public void setUpdateRect(Rectangle updateRect)

Sets the rectangle representing the area which needs to be repainted in response to this event.

Parameters:: updateRect - the rectangle area which needs to be repainted

paramString

public String paramString()

Description copied from class: ComponentEvent

Returns a parameter string identifying this event. This method is useful for event-logging and for debugging.

Overrides:: paramString in class ComponentEvent

Returns:: a string identifying the event and its attributes