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Class jclass.bwt.JCComponent

java.lang.Object
   |
   +----java.awt.Component
           |
           +----java.awt.Canvas
                   |
                   +----jclass.bwt.JCComponent

public class JCComponent

extends Canvas

Methods which may be supplied by a subclass

 drawComponent (mandatory)
 preferredWidth
 preferredHeight
 reshape
 

Properties

Name	Method
Background	setBackground
DoubleBuffer	setDoubleBuffer
Font	setFont
Foreground	setForeground
HighlightColor	setHighlightColor
HighlightThickness	setHighlightThickness
Insets	setInsets
PreferredSize	setPreferredSize
ShadowThickness	setShadowThickness
Traversable	setTraversable
UserData	setUserData

applet

The parent applet.

applet_context

The current context.

dblbuffer_image

Current double-buffer image.

draw_gc

The instance passed to paint().

highlight

Highlight thickness.

in_repaint

In repaint() ?

needs_layout

Needs layout?

shadow

Shadow thickness.

shadow_type

Shadow type.

version

JCComponent()

Creates a component.

JCComponent(Applet, String)

Creates a component which reads parameters from the applet's HTML file.

addNotify()

Creates the peer of the canvas.

createImage(int, int)

Creates an off-screen drawable Image to be used for double buffering.

disable()

Disables the component.

drawHighlight(boolean)

Draws or clears the highlight rectangle (called by gotFocus).

drawHighlight(Graphics, boolean)

Draws or clears the highlight rectangle (called by paint).

drawShadow(Graphics)

Draws the shadow (called by paint).

enable()

Enables the component.

enable11Events(long)

For JDK1.1, calls Component.enableEvents (which is final).

fillBackground(Graphics)

Fills the component with the background color (called by paint).

getAppletContext()

Gets the component's applet's context.

getConverter()

Gets the converter used for converting strings to internal values.

getDoubleBuffer()

Gets the component's DoubleBuffer value.

getDoubleBufferGraphics()

Creates a double-buffer image, for subsequent retrieval via getDoubleBufferImage

getDoubleBufferImage()

Returns the double-buffer image previously created in a call to getDoubleBufferGraphics.

getDrawingArea()

Gets the bounding rectangle of the component's drawing area, (its area minus the shadows and insets).

getDrawingArea(Rectangle)

Gets the bounding rectangle of the component's drawing area, (its area minus the shadows and insets).

getDrawingAreaHeight()

Gets the bounding rectangle's height of the component's drawing area, (its area minus the shadows and insets).

getDrawingAreaWidth()

Gets the bounding rectangle's width of the component's drawing area, (its area minus the shadows and insets).

getFrame()

Gets the parent frame.

getHighlightColor()

Gets the color of the highlight rectangle.

getHighlightThickness()

Gets the thickness of the highlight rectangle.

getInsets()

Returns the previously set insets.

getPaintRect()

Returns the area currently being painted, relative to the component's origin.

getParameters()

Reads the parameter values from the HTML page using the component's applet.

getParameters(Applet)

Reads the parameter values from the HTML page using the specified applet.

getParameters(Applet, String)

Reads the parameter values from the file.

getShadowThickness()

Gets the shadow's thickness.

HTML param name/value: "ShadowThickness"/int

getUserData()

Gets the userdata value.

getUserDataInt()

Gets the userdata value as an int.

gotFocus(Event, Object)

Called when the component receives keyboard focus.

hasFocus()

Returns true if this component has keyboard focus.

insets()

Returns the previously set insets.

isFocusTraversable()

Returns whether this component can be traversed using Tab or Shift-Tab keyboard focus traversal.

isTraversable()

Returns true if the component can accept focus - it must be traversable, showing, and enabled.

layout()

Lays out the component's internal elements.

lostFocus(Event, Object)

Called when the component loses keyboard focus.

minimumSize()

Returns preferredSize().

mouseDown(Event, int, int)

If btn1 is pressed and the component is traversable, requestFocus is called.

paint(Graphics)

An internal method used to handle repaint events.

paintComponent(Graphics)

Called by paint.

preferredHeight()

Gets the subclass' preferred height (default: 100).

preferredSize()

Returns the preferred size of this component.

preferredWidth()

Gets the subclass' preferred width (default: 100).

printAll(Graphics)

Disables double-buffering, and calls Container.printAll

processFocusEvent(FocusEvent)

Processes focus events occurring on this component by dispatching them to any registered FocusListener objects.

processKeyEvent(KeyEvent)

Processes key events occurring on this component by dispatching them to any registered KeyListener objects.

processMouseEvent(MouseEvent)

Processes mouse events occurring on this component by dispatching them to any registered MouseListener objects.

processMouseMotionEvent(MouseEvent)

Processes mouse motion events occurring on this component by dispatching them to any registered MouseMotionListener objects.

repaint()

Overrides Component.repaint(), which does not always call paint().

repaint(int, int, int, int)

Repaints part of the component by calling paint directly.

repaint(Rectangle)

Repaints part of the component by calling paint directly.

requestFocus()

Requests the input focus.

reshape(int, int, int, int)

Reshapes the Component to the specified bounding box.

reshape(Rectangle)

Reshapes the Component to the specified bounding box.

setBackground(Color)

Sets the background color of the component.

HTML param name/value: "Background"/Color

setConverter(JCConverter)

Sets the converter to be used for converting strings to internal values.

setCursor(int)

Sets the cursor in the parent frame.

setDoubleBuffer(boolean)

Controls whether double-buffering is used when displaying and updating the component.

HTML param name/value: "DoubleBuffer"/boolean

setFont(Font)

Sets the font of the component.

HTML param name/value: "Font"/font

setForeground(Color)

Sets the foreground color of the component.

HTML param name/value: "Foreground"/Color

setHighlightColor(Color)

Sets the color of the rectangle drawn when the component has focus (default: black).

HTML param name/value: "HighlightColor"/Color

setHighlightThickness(int)

Sets the thickness of the rectangle drawn when the component has focus (default: 2).

HTML param name/value: "HighlightThickness"/int

setInsets(Insets)

Sets the component's margins (default: 0).

HTML param name/value: "Insets"/Insets

setPreferredSize(int, int)

Sets the component's preferred size.

setShadowThickness(int)

Sets the shadow's thickness (default: 2)

setTraversable(boolean)

Sets whether the component can accept focus (default: true).

HTML param name/value: "Traversable"/boolean

setUserData(Object)

Sets an application-defined object that can be attached to the component.

update(Graphics)

Overriden because the default implementation always calls clearRect first, causing unwanted flicker

updateParent()

Forces the parent to relayout this component.

validate()

Validates a component.

  public final static String version

  protected transient Applet applet

The parent applet.

  protected transient AppletContext applet_context

The current context.

  protected transient boolean in_repaint

In repaint() ?

  protected transient boolean needs_layout

Needs layout?

  protected int highlight

Highlight thickness.

  protected int shadow

Shadow thickness.

  protected int shadow_type

Shadow type.

  protected transient Graphics draw_gc

The instance passed to paint().

  protected transient Image dblbuffer_image

Current double-buffer image.

  public JCComponent()

Creates a component. No parameters are read from an HTML file.

  public JCComponent(Applet applet,
                     String name)

Creates a component which reads parameters from the applet's HTML file.

Parameters:

applet - the applet whose PARAM tags are to be read

name - if this is not null, only parameters preceded by this name are read

See Also:

getParameter

  protected void getParameters()

Reads the parameter values from the HTML page using the component's applet. The values will override those previously set. Subclasses may override this method to set their own values - in this case, the method should first call super.getParameters().

  public void getParameters(Applet applet)

Reads the parameter values from the HTML page using the specified applet. The values will override those previously set.

See Also:

getParameter

  public void getParameters(Applet applet,
                            String file)

Reads the parameter values from the file. The values will override those previously set.

Parameters:

applet - if not null and in a browser, its documentBase() is used to construct a complete filename if necessary

file - if an http protocol is not specified (if a ":" is not present), the current working directory is used

  public static void setConverter(JCConverter c)

Sets the converter to be used for converting strings to internal values.

See Also:

JCConverter

  public static JCConverter getConverter()

Gets the converter used for converting strings to internal values.

See Also:

JCConverter

  public synchronized void setFont(Font f)

Sets the font of the component.

HTML param name/value: "Font"/font

Overrides:

setFont in class Component

See Also:

toFont

  public synchronized void setBackground(Color c)

Sets the background color of the component.

HTML param name/value: "Background"/Color

Overrides:

setBackground in class Component

See Also:

toColor

  public synchronized void setForeground(Color c)

Sets the foreground color of the component.

HTML param name/value: "Foreground"/Color

Overrides:

setForeground in class Component

See Also:

toColor

  public int getShadowThickness()

Gets the shadow's thickness.

HTML param name/value: "ShadowThickness"/int

See Also:

setShadowThickness

  public void setShadowThickness(int v)

Sets the shadow's thickness (default: 2)

  public int getHighlightThickness()

Gets the thickness of the highlight rectangle.

See Also:

setHighlightThickness

  public synchronized void setHighlightThickness(int v)

Sets the thickness of the rectangle drawn when the component has focus (default: 2).

HTML param name/value: "HighlightThickness"/int

See Also:

toInt

  public Color getHighlightColor()

Gets the color of the highlight rectangle.

See Also:

setHighlightColor

  public synchronized void setHighlightColor(Color v)

Sets the color of the rectangle drawn when the component has focus (default: black).

HTML param name/value: "HighlightColor"/Color

See Also:

toColor

  public synchronized void setInsets(Insets insets)

Sets the component's margins (default: 0).

HTML param name/value: "Insets"/Insets

See Also:

toInsets

  public Rectangle getDrawingArea()

Gets the bounding rectangle of the component's drawing area, (its area minus the shadows and insets).

See Also:

setInsets

  public void getDrawingArea(Rectangle rect)

Gets the bounding rectangle of the component's drawing area, (its area minus the shadows and insets).

See Also:

setInsets

  public int getDrawingAreaHeight()

Gets the bounding rectangle's height of the component's drawing area, (its area minus the shadows and insets).

See Also:

setInsets

  public int getDrawingAreaWidth()

Gets the bounding rectangle's width of the component's drawing area, (its area minus the shadows and insets).

See Also:

setInsets

  public Insets insets()

Returns the previously set insets.

See Also:

setInsets

  public Insets getInsets()

Returns the previously set insets.

See Also:

setInsets

  public Frame getFrame()

Gets the parent frame.

  public void setCursor(int cursor)

Sets the cursor in the parent frame.

  public synchronized void enable()

Enables the component.

Overrides:

enable in class Component

  public synchronized void disable()

Disables the component.

Overrides:

disable in class Component

  public boolean isTraversable()

Returns true if the component can accept focus - it must be traversable, showing, and enabled.

See Also:

setTraversable, isEnabled, isShowing

  public boolean isFocusTraversable()

Returns whether this component can be traversed using Tab or Shift-Tab keyboard focus traversal.

Overrides:

isFocusTraversable in class Component

See Also:

setTraversable

  public void setTraversable(boolean v)

Sets whether the component can accept focus (default: true).

HTML param name/value: "Traversable"/boolean

See Also:

toBoolean

  public Object getUserData()

Gets the userdata value.

See Also:

setUserData

  public int getUserDataInt()

Gets the userdata value as an int.

Returns:

0 if no user data has been set.

See Also:

setUserData

  public void setUserData(Object v)

Sets an application-defined object that can be attached to the component.

  public synchronized void layout()

Lays out the component's internal elements.

Overrides:

layout in class Component

  public synchronized void reshape(Rectangle rect)

Reshapes the Component to the specified bounding box.

  public Image getDoubleBufferImage()

Returns the double-buffer image previously created in a call to getDoubleBufferGraphics.

See Also:

getDoubleBufferGraphics

  public synchronized Graphics getDoubleBufferGraphics()

Creates a double-buffer image, for subsequent retrieval via getDoubleBufferImage

Returns:

the Graphics instance for the image

See Also:

getDoubleBufferImage

  public synchronized void repaint()

Overrides Component.repaint(), which does not always call paint().

Overrides:

repaint in class Component

  public synchronized void repaint(Rectangle r)

Repaints part of the component by calling paint directly.

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

Repaints part of the component by calling paint directly.

Overrides:

repaint in class Component

  public void update(Graphics g)

Overriden because the default implementation always calls clearRect first, causing unwanted flicker

Overrides:

update in class Component

  public void updateParent()

Forces the parent to relayout this component.

  protected synchronized void paintComponent(Graphics gc)

Called by paint.

  protected void fillBackground(Graphics gc)

Fills the component with the background color (called by paint).

  protected void drawHighlight(boolean on)

Draws or clears the highlight rectangle (called by gotFocus).

Parameters:

on - if true, draws the highlight rectangle; otherwise clears the rect

  protected void drawHighlight(Graphics gc,
                               boolean on)

Draws or clears the highlight rectangle (called by paint).

Parameters:

on - if true, draws the highlight rectangle; otherwise clears the rect

  protected void drawShadow(Graphics gc)

Draws the shadow (called by paint).

  public Rectangle getPaintRect()

Returns the area currently being painted, relative to the component's origin.

Returns:

null if no area is being drawn

See Also:

paint

  public synchronized void paint(Graphics gc)

An internal method used to handle repaint events. Allocates double buffer image, draws highlight rectangle and shadows, then calls the subclass' paintComponent() method.

Overrides:

paint in class Canvas

See Also:

setDoubleBuffer, fillBackground, drawShadow, drawHighlight, setHighlightThickness, paintComponent

  public void printAll(Graphics gc)

Disables double-buffering, and calls Container.printAll

Overrides:

printAll in class Component

See Also:

setDoubleBuffer

  protected void enable11Events(long mask)

For JDK1.1, calls Component.enableEvents (which is final).

  public void addNotify()

Creates the peer of the canvas.

Overrides:

addNotify in class Canvas

  public AppletContext getAppletContext()

Gets the component's applet's context. The applet context lets an applet control the applet's environment which is usually the browser or the applet viewer.

Returns:

null if the component is not in an applet or the applet is not in a browser

See Also:

getAppletContext

  public Dimension minimumSize()

Returns preferredSize().

Overrides:

minimumSize in class Component

  protected int preferredWidth()

Gets the subclass' preferred width (default: 100). The subclass should not include the shadow, highlight, or inset sizes in its calculation; these will be added by JCComponent.

  protected int preferredHeight()

Gets the subclass' preferred height (default: 100). The subclass should not include the shadow, highlight, or inset sizes in its calculation; these will be added by JCComponent.

  public void setPreferredSize(int w,
                               int h)

Sets the component's preferred size. If either dimension is set to BWTEnum.NOVALUE, it is calculated by the subclass (default size: 100x100).

See Also:

preferredSize

  public Dimension preferredSize()

Returns the preferred size of this component. If the app has set the preferred size, that is returned. Otherwise the subclass' preferredWidth and/or preferredHeight method is called. This value may be set from an HTML file using a PARAM tag with a "preferredWidth" name and an int value, and/or a "preferredHeight" name and an int value.

Overrides:

preferredSize in class Component

See Also:

setPreferredSize, preferredWidth, preferredHeight, toInt

  public boolean getDoubleBuffer()

Gets the component's DoubleBuffer value.

See Also:

setDoubleBuffer

  public void setDoubleBuffer(boolean v)

Controls whether double-buffering is used when displaying and updating the component.

HTML param name/value: "DoubleBuffer"/boolean

See Also:

toBoolean

  public boolean hasFocus()

Returns true if this component has keyboard focus.

  public boolean lostFocus(Event ev,
                           Object what)

Called when the component loses keyboard focus.

Overrides:

lostFocus in class Component

See Also:

drawHighlight

  public boolean gotFocus(Event ev,
                          Object what)

Called when the component receives keyboard focus.

Overrides:

gotFocus in class Component

See Also:

drawHighlight

  protected void processFocusEvent(FocusEvent focus_ev)

Processes focus events occurring on this component by dispatching them to any registered FocusListener objects.

Overrides:

processFocusEvent in class Component

  protected void processKeyEvent(KeyEvent key_ev)

Processes key events occurring on this component by dispatching them to any registered KeyListener objects.

Overrides:

processKeyEvent in class Component

  protected void processMouseEvent(MouseEvent mouse_ev)

Processes mouse events occurring on this component by dispatching them to any registered MouseListener objects.

Overrides:

processMouseEvent in class Component

  protected void processMouseMotionEvent(MouseEvent mouse_ev)

Processes mouse motion events occurring on this component by dispatching them to any registered MouseMotionListener objects.

Overrides:

processMouseMotionEvent in class Component

  public boolean mouseDown(Event ev,
                           int x,
                           int y)

If btn1 is pressed and the component is traversable, requestFocus is called.

Overrides:

mouseDown in class Component

See Also:

isTraversable

  public void requestFocus()

Requests the input focus. gotFocus() will be called if this method is successful.

Overrides:

requestFocus in class Component

See Also:

gotFocus

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

Reshapes the Component to the specified bounding box.

Overrides:

reshape in class Component

  public void validate()

Validates a component.

Overrides:

validate in class Component

  public Image createImage(int w,
                           int h)

Creates an off-screen drawable Image to be used for double buffering.

Overrides:

createImage in class Component

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