Tài liệu Introduction to Java:23 java.awt.peer Reference pdf

Description Adds a new entry to the available choices at the designated posi-
tion.
remove
public abstract void remove (int index) ★
Parameters index Position of the item to remove.
Description Removes an entry at the given position.
select
public abstract void select (int position)
Parameters position Position to make selected entry.
Description Makes the given entry the selected one for the choice’s peer.
See Also
ComponentPeer, String
23.6 ComponentPeer
Description
ComponentPeer is an interface that defines the basis for all non-menu GUI peer
inter faces.
Interface Definition
public abstract interface java.awt.peer.ComponentPeer {
// Interface Methods
public abstract int checkImage (Image image, int width, int height,
ImageObserver observer);
public abstract Image createImage (ImageProducer producer);
public abstract Image createImage (int width, int height);
public abstract void disable(); ✩
public abstract void dispose();
public abstract void enable(); ✩
public abstract ColorModel getColorModel();
public abstract FontMetrics getFontMetrics (Font f);
public abstract Graphics getGraphics();
public abstract Point getLocationOnScreen(); ★
public abstract Dimension getMinimumSize(); ★
public abstract Dimension getPreferredSize(); ★
public abstract Toolkit getToolkit();
public abstract boolean handleEvent (Event e);
public abstract void hide(); ✩
public abstract boolean isFocusTraversable(); ★
public abstract Dimension minimumSize(); ✩
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public abstract void paint (Graphics g);
public abstract Dimension preferredSize ();
✩
public abstract boolean prepareImage (Image image, int width, int height,
ImageObserver observer);
public abstract void print (Graphics g);
public abstract void repaint (long tm, int x, int y, int width, int height);
public abstract void requestFocus();
public abstract void reshape (int x, int y, int width, int height); ✩
public abstract void setBackground (Color c);
public abstract void setBounds (int x, int y, int width, int height); ★
public abstract void setCursor (Cursor cursor); ★
public abstract void setEnabled (boolean b); ★
public abstract void setFont (Font f);
public abstract void setForeground (Color c);
public abstract void setVisible (boolean b); ★
public abstract void show(); ✩
}
Interface Methods
checkImage
public abstract int checkImage (Image image, int width,
int height, ImageObserver observer)
Parameters image Image to check.
width Horizontal size to which the image will be
scaled.
height Vertical size to which the image will be scaled.
obser ver An ImageObserver to monitor image loading;
normally, the object on which the image will be
rendered.
Returns ImageObserver flags ORed together indicating status.
Description Checks status of image construction.
createImage
public abstract Image createImage (ImageProducer producer)
Parameters producer An object that implements the ImageProducer
inter face to create a new image.
Returns Newly created image instance.
Description Creates an Image based upon an ImageProducer.
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public abstract Image createImage (int width, int height)
Parameters width Horizontal size for in-memory Image.
height Vertical size for in-memory
Image.
Returns Newly created image instance.
Description Creates an in-memory Image for double buffering.
disable
public abstract void disable() ✩
Description Disables component so that it is unresponsive to user interac-
tions. Replaced by
setEnabled(false).
dispose
public abstract void dispose()
Description Releases resources used by peer.
enable
public abstract void enable() ✩
Description Enables component so that it is responsive to user interactions.
Replaced by setEnabled(true).
getColorModel
public abstract ColorModel getColorModel()
Returns ColorModel used to display the current component.
getFontMetrics
public abstract FontMetrics getFontMetrics (Font f)
Parameters f A font whose metrics are desired.
Returns Font sizing information for the desired font.
getGraphics
public abstract Graphics getGraphics()
Throws InternalException
If acquiring a graphics context is unsupported
Returns Component’s graphics context.
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getLocationOnScreen
public abstract Point getLocationOnScreen() ★
Returns The location of the component in the screen’s coordinate
space.
getMinimumSize
public abstract Dimension getMinimumSize() ★
Returns The minimum dimensions of the component.
getPreferredSize
public abstract Dimension getPreferredSize() ★
Returns The preferred dimensions of the component.
getToolkit
public abstract Toolkit getToolkit()
Returns Toolkit of Component.
handleEvent
public abstract boolean handleEvent (Event e)
Parameters e Event instance identifying what caused the
method to be called.
Returns true if the peer handled the event, false to propagate the
event to the parent container.
Description High-level event handling routine.
hide
public abstract void hide() ✩
Description Hides the component. Replaced by setVisible(false).
isFocusTraversable
public abstract boolean isFocusTraversable() ★
Returns true if the peer can be tabbed onto, false other wise.
Description Determines if this peer is navigable using the keyboard.
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minimumSize
public abstract Dimension minimumSize() ✩
Returns The minimum dimensions of the component. Replaced by
getMinimumSize().
paint
public abstract void paint (Graphics g)
Parameters g Graphics context of the component.
Description Draws something in graphics context.
preferredSize
public abstract Dimension preferredSize() ✩
Returns The preferred dimensions of the component. Replaced by
getPreferredSize().
prepareImage
public abstract boolean prepareImage (Image image, int
width,
int height, ImageObserver observer)
Parameters image Image to load.
width Horizontal size to which the image will be
scaled.
height Vertical size to which the image will be scaled.
obser ver An ImageObserver to monitor image loading;
normally, the object on which the image will be
rendered.
Returns true if the image has already loaded, false other wise.
Description Forces the image to start loading.
print
public abstract void print (Graphics g)
Parameters g Graphics context of component.
Description Print something from the graphics context.
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repaint
public abstract void repaint (long tm, int x, int y, int
width, int height)
Parameters tm Millisecond delay allowed before repaint.
x Horizontal origin of bounding box to redraw.
y Vertical origin of bounding box to redraw.
width Width of bounding box to redraw.
height Height of bounding box to redraw.
Description Requests scheduler to redraw portion of component within a
time period.
requestFocus
public abstract void requestFocus()
Description Requests this Component gets the input focus.
reshape
public abstract void reshape (int x, int y, int width,
int height)
✩
Parameters x New horizontal position for component.
y New vertical position for component.
width New width for component.
height New height for component.
Description Relocates and resizes the component’s peer. Replaced by set-
Bounds(int, int, int, int)
.
setBackground
public abstract void setBackground (Color c)
Parameters c New color for the background.
Description Changes the background color of the component.
setBounds
public abstract void setBounds (int x, int y, int width,
int height)
★
Parameters x New horizontal position for component.
y New vertical position for component.
width New width for component.
height New height for component.
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Description Relocates and resizes the component’s peer.
setCursor
public abstract void setCursor (Cursor cursor) ★
Parameters cursor New cursor.
Description Changes the cursor of the component.
setEnabled
public abstract void setEnabled (boolean b) ★
Parameters b true to enable the peer; false to disable it.
Description Enables or disables the peer.
setFont
public abstract void setFont (Font f)
Parameters f New font for the component.
Description Changes the font used to display text in the component.
setForeground
public abstract void setForeground (Color c)
Parameters c New foreground color for the component.
Description Changes the foreground color of the component.
setVisible
public abstract void setVisible (boolean b) ★
Parameters b true to show the peer; false to hide it.
Description Shows or hides the peer.
show
public abstract void show() ✩
Description Makes the peer visible. Replaced by setVisible(true).
See Also
ButtonPeer, CanvasPeer, CheckboxPeer, ChoicePeer, Color, ColorModel,
ContainerPeer, Cursor, Dimension, Event, Font, FontMetrics, Graphics,
Image, ImageObserver, ImageProducer, LabelPeer, ListPeer, Scroll-
barPeer
, TextComponentPeer, Toolkit
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23.7 ContainerPeer
Description
ContainerPeer is an interface that defines the basis for containers.
Interface Definition
public abstract interface java.awt.peer.ContainerPeer
extends java.awt.peer.ComponentPeer {
// Interface Methods
public abstract void beginValidate();
★
public abstract void endValidate(); ★
public abstract Insets getInsets(); ★
public abstract Insets insets(); ✩
}
Interface Methods
beginValidate
public abstract void beginValidate() ★
Description Notifies the peer that the Container is going to validate its
contents.
endValidate
public abstract void endValidate() ★
Description Notifies the peer that the Container is finished validating its
contents.
getInsets
public Insets getInsets() ★
Returns Current Insets of container’s peer.
insets
public Insets insets() ✩
Returns Current Insets of container’s peer. Replaced by
getInsets().
See Also
ComponentPeer, Insets, PanelPeer, ScrollPanePeer, WindowPeer
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23.8 DialogPeer
Description
DialogPeer is an interface that defines the basis for a dialog box.
Interface Definition
public abstract interface java.awt.peer.DialogPeer
extends java.awt.peer.WindowPeer {
// Interface Methods
public abstract void setResizable (boolean resizable);
public abstract void setTitle (String title);
}
Interface Methods
setResizable
public abstract void setResizable (boolean resizable)
Parameters resizable true if the dialog’s peer should allow resizing;
false to prevent resizing.
Description Changes the resize state of the dialog’s peer.
setTitle
public abstract void setTitle (String title)
Parameters title New title for the dialog’s peer.
Description Changes the title of the dialog’s peer.
See Also
FileDialogPeer, String, WindowPeer
23.9 FileDialogPeer
Description
FileDialogPeer is an interface that defines the basis for a file dialog box.
Interface Definition
public abstract interface java.awt.peer.FileDialogPeer
extends java.awt.peer.DialogPeer {
// Interface Methods
public abstract void setDirectory (String directory);
public abstract void setFile (String file);
public abstract void setFilenameFilter (FilenameFilter filter);
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java.awt.Component java.awt.Container
java.awt.Window
java.lang.Object
java.awt.Dialog
java.awt.FileDialog
}
Interface Methods
setDirectory
public abstract void setDirectory (String directory)
Parameters director y Initial directory for file dialog’s peer.
Description Changes the directory displayed in the file dialog’s peer.
setFile
public abstract void setFile (String file)
Parameters file Initial filename for the file dialog’s peer.
Description Changes the default file selection for the file dialog’s peer.
setFilenameFilter
public abstract void setFilenameFilter (FilenameFilter
filter)
Parameters filter Initial filter for file dialog’s peer.
Description Changes the current filename filter of the file dialog’s peer.
See Also
DialogPeer, FilenameFilter, String
23.10 FontPeer ★
Description
FontPeer is an interface that defines the basis for fonts.
Interface Definition
public abstract interface java.awt.peer.FontPeer {
}
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