Class GLightweightPeer

public GLightweightPeer()

The basic constructor. Object is special, because it has no superclass, so there is no call to super().

public void beginLayout()

Specified by:

beginLayout in interface ContainerPeer

public void beginValidate()

Specified by:

beginValidate in interface ContainerPeer

public boolean canDetermineObscurity()

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

Specified by:

canDetermineObscurity in interface ComponentPeer

Returns:

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

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

Cancel a pending paint event on a region of this container.

Specified by:

cancelPendingPaint in interface ContainerPeer

Parameters:

x - the x co-ordinate of the region

y - the y co-ordinate of the region

width - the width of the region

height - the height of the region

Since:

1.5

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

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

Specified by:

checkImage in interface ComponentPeer

Parameters:

img - the image

width - the width of the image

height - the height of the image

Returns:

a bitwise ORed set of ImageObserver flags

public void coalescePaintEvent(PaintEvent e)

Coalesces the specified paint event.

Specified by:

coalescePaintEvent in interface ComponentPeer

Parameters:

e - the paint event

public void createBuffers(int x,
                          BufferCapabilities capabilities)
            throws AWTException

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

Specified by:

createBuffers in interface ComponentPeer

Parameters:

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.

Specified by:

createImage in interface ComponentPeer

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).

Specified by:

createImage in interface ComponentPeer

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.

Specified by:

createVolatileImage in interface ComponentPeer

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.

Specified by:

destroyBuffers in interface ComponentPeer

Since:

1.2

public void disable()

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

Specified by:

disable in interface ComponentPeer

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.

Specified by:

dispose in interface ComponentPeer

public void enable()

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

Specified by:

enable in interface ComponentPeer

public void endLayout()

Specified by:

endLayout in interface ContainerPeer

public void endValidate()

Specified by:

endValidate in interface ContainerPeer

public void flip(BufferCapabilities.FlipContents contents)

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

Specified by:

flip in interface ComponentPeer

Parameters:

contents - the state in which to leave the back buffer

Since:

1.2

public Image getBackBuffer()

Return the back buffer of this component.

Specified by:

getBackBuffer in interface ComponentPeer

Returns:

the back buffer of this component.

Since:

1.2

public Rectangle getBounds()

Get the bounds of this component peer.

Specified by:

getBounds in interface ComponentPeer

Returns:

component peer bounds

Since:

1.5

public ColorModel getColorModel()

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

Specified by:

getColorModel in interface ComponentPeer

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).

Specified by:

getFontMetrics in interface ComponentPeer

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().

Specified by:

getGraphics in interface ComponentPeer

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.

Specified by:

getGraphicsConfiguration in interface ComponentPeer

Returns:

the graphics configuration of the component

public Insets getInsets()

Specified by:

getInsets in interface ContainerPeer

public Point getLocationOnScreen()

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

Specified by:

getLocationOnScreen in interface ComponentPeer

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().

Specified by:

getMinimumSize in interface ComponentPeer

Returns:

the minimum size for the component

public Dimension getPreferredSize()

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

Specified by:

getPreferredSize in interface ComponentPeer

Returns:

the preferred size for the component

public Toolkit getToolkit()

Returns the toolkit that created this peer.

Specified by:

getToolkit in interface ComponentPeer

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.

Specified by:

handleEvent in interface ComponentPeer

Parameters:

e - the event

public boolean handlesWheelScrolling()

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

Specified by:

handlesWheelScrolling in interface ComponentPeer

Returns:

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

public void hide()

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

Specified by:

hide in interface ComponentPeer

public Insets insets()

Specified by:

insets in interface ContainerPeer

public boolean isFocusTraversable()

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

Specified by:

isFocusTraversable in interface ComponentPeer

public boolean isFocusable()

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

Specified by:

isFocusable in interface ComponentPeer

public boolean isObscured()

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

Specified by:

isObscured in interface ComponentPeer

Returns:

true if this component has been obscured, false otherwise.

public boolean isPaintPending()

Specified by:

isPaintPending in interface ContainerPeer

public boolean isReparentSupported()

Check if this component supports being reparented.

Specified by:

isReparentSupported in interface ComponentPeer

Returns:

true if this component can be reparented, false otherwise.

Since:

1.5

public boolean isRestackSupported()

Check if this container peer can be restacked.

Specified by:

isRestackSupported in interface ContainerPeer

Returns:

true if this container peer supports being restacked, false otherwise

Since:

1.5

public void layout()

Layout this component peer.

Specified by:

layout in interface ComponentPeer

Since:

1.5

public Dimension minimumSize()

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

Specified by:

minimumSize in interface ComponentPeer

Returns:

the minimum size for the component

public void paint(Graphics graphics)

Specified by:

paint in interface ComponentPeer

public Dimension preferredSize()

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

Specified by:

preferredSize in interface ComponentPeer

Returns:

the preferred size for the component

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

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

Specified by:

prepareImage in interface ComponentPeer

Parameters:

img - the image to prepare

width - the desired width of the rendered image

height - the desired height of the rendered image

Returns:

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

public void print(Graphics graphics)

Specified by:

print in interface ComponentPeer

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).

Specified by:

repaint in interface ComponentPeer

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.

Specified by:

reparent in interface ComponentPeer

Parameters:

parent -

Since:

1.5

public void requestFocus()

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

Specified by:

requestFocus in interface ComponentPeer

public boolean requestFocus(Component source,
                            boolean bool1,
                            boolean bool2,
                            long x)

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.

Specified by:

requestFocus in interface ComponentPeer

Parameters:

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

Requests the focus on the component.

Specified by:

requestFocus in interface ComponentPeer

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).

Specified by:

reshape in interface ComponentPeer

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 restack()

Restack the component peers in this container peer.

Specified by:

restack in interface ContainerPeer

Since:

1.5

public void setBackground(Color color)

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

Specified by:

setBackground in interface ComponentPeer

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).

Specified by:

setBounds in interface ComponentPeer

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 z,
                      int width,
                      int height)

Set the bounds of this component peer.

Specified by:

setBounds in interface ComponentPeer

Parameters:

x - the new x co-ordinate

y - the new y co-ordinate

z - the new stacking level

width - the new width

height - the new height

Since:

1.5

public void setCursor(Cursor cursor)

Sets the cursor on the heavy-weight parent peer. Called by the MouseListener on mouse enter.

Specified by:

setCursor in interface ComponentPeer

public void setEnabled(boolean enabled)

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

Specified by:

setEnabled in interface ComponentPeer

Parameters:

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

public void setEventMask(long eventMask)

Part of an older API, no longer needed.

Specified by:

setEventMask in interface ComponentPeer

public void setFont(Font font)

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

Specified by:

setFont in interface ComponentPeer

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).

Specified by:

setForeground in interface ComponentPeer

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).

Specified by:

setVisible in interface ComponentPeer

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().

Specified by:

show in interface ComponentPeer

public void updateCursorImmediately()

Updates the cursor.

Specified by:

updateCursorImmediately in interface ComponentPeer