Interface ComponentPeer

public boolean canDetermineObscurity()

Returns true if this component peer can determine if the component has been obscured, false otherwise.

Returns:

true if this component peer can determine if the component has been obscured, false otherwise

public int checkImage(Image img,
                      int width,
                      int height,
                      ImageObserver ob)

Returns the construction status of the specified image. This is called by Component.checkImage(Image,int,int,ImageObserver).

Parameters:

img - the image

width - the width of the image

height - the height of the image

ob - the image observer to be notified of updates of the status

Returns:

a bitwise ORed set of ImageObserver flags

public void coalescePaintEvent(PaintEvent e)

Coalesces the specified paint event.

Parameters:

e - the paint event

public void createBuffers(int numBuffers,
                          BufferCapabilities caps)
            throws AWTException

Create a number of image buffers that implement a buffering strategy according to the given capabilities.

Parameters:

numBuffers - the number of buffers

caps - the buffering capabilities

Throws:

AWTException - if the specified buffering strategy is not implemented

Since:

1.2

public Image createImage(int width,
                         int height)

Creates an empty image with the specified width and height.

Parameters:

width - the width of the image to be created

height - the height of the image to be created

Returns:

the created image

public Image createImage(ImageProducer prod)

Creates an image by starting the specified image producer. This is called by Component.createImage(ImageProducer).

Parameters:

prod - the image producer to be used to create the image

Returns:

the created image

public VolatileImage createVolatileImage(int width,
                                         int height)

A convenience method that creates a volatile image. The volatile image is created on the screen device on which this component is displayed, in the device's current graphics configuration.

Parameters:

width - width of the image

height - height of the image

Since:

1.2

See Also:

VolatileImage

public void destroyBuffers()

Destroy the resources created by createBuffers.

Since:

1.2

public void disable()

Disables the component. This is called by Component.disable().

public void dispose()

Disposes the component peer. This should release all resources held by the peer. This is called when the component is no longer in use.

public void enable()

Enables the component. This is called by Component.enable().

public void flip(BufferCapabilities.FlipContents contents)

Perform a page flip, leaving the contents of the back buffer in the specified state.

Parameters:

contents - the state in which to leave the back buffer

Since:

1.2

public Image getBackBuffer()

Return the back buffer of this component.

Returns:

the back buffer of this component.

Since:

1.2

public Rectangle getBounds()

Get the bounds of this component peer.

Returns:

component peer bounds

Since:

1.5

public ColorModel getColorModel()

Returns the color model of the component. This is currently not used.

Returns:

the color model of the component

public FontMetrics getFontMetrics(Font f)

Returns the font metrics for the specified font. This is called by Component.getFontMetrics(Font).

Parameters:

f - the font for which to query the font metrics

Returns:

the font metrics for the specified font

public Graphics getGraphics()

Returns a Graphics object suitable for drawing on this component. This is called by Component.getGraphics().

Returns:

a graphics object suitable for drawing on this component

public GraphicsConfiguration getGraphicsConfiguration()

Get the graphics configuration of the component. The color model of the component can be derived from the configuration.

Returns:

the graphics configuration of the component

public Point getLocationOnScreen()

Returns the location of this component in screen coordinates. This is called by Component.getLocationOnScreen().

Returns:

the location of this component in screen coordinates

public Dimension getMinimumSize()

Returns the minimum size for the component. This is called by Component.getMinimumSize().

Returns:

the minimum size for the component

public Dimension getPreferredSize()

Returns the preferred size for the component. This is called by Component.getPreferredSize().

Returns:

the preferred size for the component

public Toolkit getToolkit()

Returns the toolkit that created this peer.

Returns:

the toolkit that created this peer

public void handleEvent(AWTEvent e)

Handles the given event. This is called from Component.dispatchEvent(AWTEvent) to give the peer a chance to react to events for the component.

Parameters:

e - the event

public boolean handlesWheelScrolling()

Returns true, if this component can handle wheel scrolling, false otherwise.

Returns:

true, if this component can handle wheel scrolling, false otherwise

public void hide()

Makes the component invisible. This is called from Component.hide().

public boolean isFocusTraversable()

Returns true if the component can receive keyboard input focus. This is called from Component.isFocusTraversable().

public boolean isFocusable()

Returns true if the component can receive keyboard input focus. This is called from Component.isFocusable().

public boolean isObscured()

Returns true if this component has been obscured, false otherwise. This will only work if canDetermineObscurity() also returns true.

Returns:

true if this component has been obscured, false otherwise.

public boolean isReparentSupported()

Check if this component supports being reparented.

Returns:

true if this component can be reparented, false otherwise.

Since:

1.5

public void layout()

Layout this component peer.

Since:

1.5

public Dimension minimumSize()

Returns the minimum size for the component. This is called by Component.minimumSize().

Returns:

the minimum size for the component

public void paint(Graphics graphics)

public Dimension preferredSize()

Returns the preferred size for the component. This is called by Component.getPreferredSize().

Returns:

the preferred size for the component

public boolean prepareImage(Image img,
                            int width,
                            int height,
                            ImageObserver ob)

Prepares an image for rendering on this component. This is called by Component.prepareImage(Image,int,int,ImageObserver).

Parameters:

img - the image to prepare

width - the desired width of the rendered image

height - the desired height of the rendered image

ob - the image observer to be notified of updates in the preparation process

Returns:

true if the image has been fully prepared, false otherwise (in which case the image observer receives updates)

public void print(Graphics graphics)

public void repaint(long tm,
                    int x,
                    int y,
                    int width,
                    int height)

Repaints the specified rectangle of this component. This is called from Component.repaint(long,int,int,int,int).

Parameters:

tm - number of milliseconds to wait with repainting

x - the X coordinate of the upper left corner of the damaged rectangle

y - the Y coordinate of the upper left corner of the damaged rectangle

width - the width of the damaged rectangle

height - the height of the damaged rectangle

public void reparent(ContainerPeer parent)

Reparent this component under another container.

Parameters:

parent -

Since:

1.5

public void requestFocus()

Requests that this component receives the focus. This is called from Component.requestFocus().

public boolean requestFocus(Component request,
                            boolean temporary,
                            boolean allowWindowFocus,
                            long time)

Requests that this component receives the focus. This is called from Component.requestFocus(). This method is only called for heavyweight component's peers. Lightweight components ask their nearest heavyweight component to request focus. It's up to the heavyweight peer to decide if any of it's lightweight descendants are allowed to receive keyboard input focus or not. If the focus request is finally approved, then the peer must post a FOCUS_GAINED event for the requested component.

Parameters:

request - the component for which the focus is requested

temporary - indicates if the focus change is temporary (true) or permanent (false)

allowWindowFocus - indicates if it's allowed to change window focus

time - the timestamp

public boolean requestFocus(Component lightweightChild,
                            boolean temporary,
                            boolean focusedWindowChangeAllowed,
                            long time,
                            CausedFocusEvent.Cause cause)

Requests the focus on the component.

public void reshape(int x,
                    int y,
                    int width,
                    int height)

Notifies the peer that the bounds of this component have changed. This is called by Component.reshape(int,int,int,int).

Parameters:

x - the X coordinate of the upper left corner of the component

y - the Y coordinate of the upper left corner of the component

width - the width of the component

height - the height of the component

public void setBackground(Color color)

Sets the background color of the component. This is called by Component.setBackground(Color).

Parameters:

color - the background color to set

public void setBounds(int x,
                      int y,
                      int width,
                      int height)

Notifies the peer that the bounds of this component have changed. This is called by Component.setBounds(int,int,int,int).

Parameters:

x - the X coordinate of the upper left corner of the component

y - the Y coordinate of the upper left corner of the component

width - the width of the component

height - the height of the component

public void setBounds(int x,
                      int y,
                      int width,
                      int height,
                      int z)

Set the bounds of this component peer.

Parameters:

x - the new x co-ordinate

y - the new y co-ordinate

width - the new width

height - the new height

z - the new stacking level

Since:

1.5

public void setCursor(Cursor cursor)

Sets the cursor of the component. This is called by Component.setCursor(Cursor).

public void setEnabled(boolean enabled)

Sets the enabled/disabled state of this component. This is called by Component.setEnabled(boolean).

Parameters:

enabled - true to enable the component, false to disable it

public void setEventMask(long mask)

Part of an older API, no longer needed.

public void setFont(Font font)

Sets the font of the component. This is called by Component.setFont(Font).

Parameters:

font - the font to set

public void setForeground(Color color)

Sets the foreground color of the component. This is called by Component.setForeground(Color).

Parameters:

color - the foreground color to set

public void setVisible(boolean visible)

Sets the visibility state of the component. This is called by Component.setVisible(boolean).

Parameters:

visible - true to make the component visible, false to make it invisible

public void show()

Makes the component visible. This is called by Component.show().

public void updateCursorImmediately()

Updates the cursor.