Java™ Platform
Standard Ed. 6

javax.swing.plaf.basic
Class BasicProgressBarUI

java.lang.Object
  extended by javax.swing.plaf.ComponentUI
      extended by javax.swing.plaf.ProgressBarUI
          extended by javax.swing.plaf.basic.BasicProgressBarUI
Direct Known Subclasses:
MetalProgressBarUI

public class BasicProgressBarUI
extends ProgressBarUI

A Basic L&F implementation of ProgressBarUI.


Nested Class Summary
 class BasicProgressBarUI.ChangeHandler
          This inner class is marked "public" due to a compiler bug.
 
Field Summary
protected  Rectangle boxRect
          Used to hold the location and size of the bouncing box (returned by getBox) to be painted.
protected  ChangeListener changeListener
           
protected  JProgressBar progressBar
           
 
Constructor Summary
BasicProgressBarUI()
           
 
Method Summary
static ComponentUI createUI(JComponent x)
           
protected  int getAmountFull(Insets b, int width, int height)
          This determines the amount of the progress bar that should be filled based on the percent done gathered from the model.
protected  int getAnimationIndex()
          Gets the index of the current animation frame.
 int getBaseline(JComponent c, int width, int height)
          Returns the baseline.
 Component.BaselineResizeBehavior getBaselineResizeBehavior(JComponent c)
          Returns an enum indicating how the baseline of the component changes as the size changes.
protected  Rectangle getBox(Rectangle r)
          Stores the position and size of the bouncing box that would be painted for the current animation index in r and returns r.
protected  int getBoxLength(int availableLength, int otherDimension)
          Returns the length of the "bouncing box" to be painted.
protected  int getCellLength()
          Returns the width (if HORIZONTAL) or height (if VERTICAL) of each of the indivdual cells/units to be rendered in the progress bar.
protected  int getCellSpacing()
          Returns the spacing between each of the cells/units in the progress bar.
protected  int getFrameCount()
          Returns the number of frames for the complete animation loop used by an indeterminate JProgessBar.
 Dimension getMaximumSize(JComponent c)
          Returns the specified component's maximum size appropriate for the look and feel.
 Dimension getMinimumSize(JComponent c)
          The Minimum size for this component is 10.
protected  Dimension getPreferredInnerHorizontal()
           
protected  Dimension getPreferredInnerVertical()
           
 Dimension getPreferredSize(JComponent c)
          Returns the specified component's preferred size appropriate for the look and feel.
protected  Color getSelectionBackground()
          The "selectionBackground" is the color of the text when it is painted over an unfilled area of the progress bar.
protected  Color getSelectionForeground()
          The "selectionForeground" is the color of the text when it is painted over a filled area of the progress bar.
protected  Point getStringPlacement(Graphics g, String progressString, int x, int y, int width, int height)
          Designate the place where the progress string will be painted.
protected  void incrementAnimationIndex()
          Sets the index of the current animation frame, to the next valid value, which results in the progress bar being repainted.
protected  void installDefaults()
           
protected  void installListeners()
           
 void installUI(JComponent c)
          Configures the specified component appropriate for the look and feel.
 void paint(Graphics g, JComponent c)
          Delegates painting to one of two methods: paintDeterminate or paintIndeterminate.
protected  void paintDeterminate(Graphics g, JComponent c)
          All purpose paint method that should do the right thing for almost all linear, determinate progress bars.
protected  void paintIndeterminate(Graphics g, JComponent c)
          All purpose paint method that should do the right thing for all linear bouncing-box progress bars.
protected  void paintString(Graphics g, int x, int y, int width, int height, int amountFull, Insets b)
           
protected  void setAnimationIndex(int newValue)
          Sets the index of the current animation frame to the specified value and requests that the progress bar be repainted.
protected  void setCellLength(int cellLen)
           
protected  void setCellSpacing(int cellSpace)
           
protected  void startAnimationTimer()
          Starts the animation thread, creating and initializing it if necessary.
protected  void stopAnimationTimer()
          Stops the animation thread.
protected  void uninstallDefaults()
           
protected  void uninstallListeners()
          Removes all listeners installed by this object.
 void uninstallUI(JComponent c)
          Reverses configuration which was done on the specified component during installUI.
 
Methods inherited from class javax.swing.plaf.ComponentUI
contains, getAccessibleChild, getAccessibleChildrenCount, update
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Field Detail

progressBar

protected JProgressBar progressBar

changeListener

protected ChangeListener changeListener

boxRect

protected Rectangle boxRect
Used to hold the location and size of the bouncing box (returned by getBox) to be painted.

Since:
1.5
Constructor Detail

BasicProgressBarUI

public BasicProgressBarUI()
Method Detail

createUI

public static ComponentUI createUI(JComponent x)

installUI

public void installUI(JComponent c)
Description copied from class: ComponentUI
Configures the specified component appropriate for the look and feel. This method is invoked when the ComponentUI instance is being installed as the UI delegate on the specified component. This method should completely configure the component for the look and feel, including the following:
  1. Install any default property values for color, fonts, borders, icons, opacity, etc. on the component. Whenever possible, property values initialized by the client program should not be overridden.
  2. Install a LayoutManager on the component if necessary.
  3. Create/add any required sub-components to the component.
  4. Create/install event listeners on the component.
  5. Create/install a PropertyChangeListener on the component in order to detect and respond to component property changes appropriately.
  6. Install keyboard UI (mnemonics, traversal, etc.) on the component.
  7. Initialize any appropriate instance data.

Overrides:
installUI in class ComponentUI
Parameters:
c - the component where this UI delegate is being installed
See Also:
ComponentUI.uninstallUI(javax.swing.JComponent), JComponent.setUI(javax.swing.plaf.ComponentUI), JComponent.updateUI()

uninstallUI

public void uninstallUI(JComponent c)
Description copied from class: ComponentUI
Reverses configuration which was done on the specified component during installUI. This method is invoked when this UIComponent instance is being removed as the UI delegate for the specified component. This method should undo the configuration performed in installUI, being careful to leave the JComponent instance in a clean state (no extraneous listeners, look-and-feel-specific property objects, etc.). This should include the following:
  1. Remove any UI-set borders from the component.
  2. Remove any UI-set layout managers on the component.
  3. Remove any UI-added sub-components from the component.
  4. Remove any UI-added event/property listeners from the component.
  5. Remove any UI-installed keyboard UI from the component.
  6. Nullify any allocated instance data objects to allow for GC.

Overrides:
uninstallUI in class ComponentUI
Parameters:
c - the component from which this UI delegate is being removed; this argument is often ignored, but might be used if the UI object is stateless and shared by multiple components
See Also:
ComponentUI.installUI(javax.swing.JComponent), JComponent.updateUI()

installDefaults

protected void installDefaults()

uninstallDefaults

protected void uninstallDefaults()

installListeners

protected void installListeners()

startAnimationTimer

protected void startAnimationTimer()
Starts the animation thread, creating and initializing it if necessary. This method is invoked when an indeterminate progress bar should start animating. Reasons for this may include: If you implement your own animation thread, you must override this method.

Since:
1.4
See Also:
stopAnimationTimer()

stopAnimationTimer

protected void stopAnimationTimer()
Stops the animation thread. This method is invoked when the indeterminate animation should be stopped. Reasons for this may include: If you implement your own animation thread, you must override this method.

Since:
1.4
See Also:
startAnimationTimer()

uninstallListeners

protected void uninstallListeners()
Removes all listeners installed by this object.


getBaseline

public int getBaseline(JComponent c,
                       int width,
                       int height)
Returns the baseline.

Overrides:
getBaseline in class ComponentUI
Parameters:
c - JComponent baseline is being requested for
width - the width to get the baseline for
height - the height to get the baseline for
Returns:
baseline or a value < 0 indicating there is no reasonable baseline
Throws:
NullPointerException - if c is null
IllegalArgumentException - if width or height is < 0
Since:
1.6
See Also:
JComponent.getBaseline(int, int)

getBaselineResizeBehavior

public Component.BaselineResizeBehavior getBaselineResizeBehavior(JComponent c)
Returns an enum indicating how the baseline of the component changes as the size changes.

Overrides:
getBaselineResizeBehavior in class ComponentUI
Parameters:
c - JComponent to return baseline resize behavior for
Returns:
an enum indicating how the baseline changes as the component size changes
Throws:
NullPointerException - if c is null
Since:
1.6
See Also:
JComponent.getBaseline(int, int)

getPreferredInnerHorizontal

protected Dimension getPreferredInnerHorizontal()

getPreferredInnerVertical

protected Dimension getPreferredInnerVertical()

getSelectionForeground

protected Color getSelectionForeground()
The "selectionForeground" is the color of the text when it is painted over a filled area of the progress bar.


getSelectionBackground

protected Color getSelectionBackground()
The "selectionBackground" is the color of the text when it is painted over an unfilled area of the progress bar.


getCellLength

protected int getCellLength()
Returns the width (if HORIZONTAL) or height (if VERTICAL) of each of the indivdual cells/units to be rendered in the progress bar. However, for text rendering simplification and aesthetic considerations, this function will return 1 when the progress string is being rendered.

Returns:
the value representing the spacing between cells
See Also:
setCellLength(int), JProgressBar.isStringPainted()

setCellLength

protected void setCellLength(int cellLen)

getCellSpacing

protected int getCellSpacing()
Returns the spacing between each of the cells/units in the progress bar. However, for text rendering simplification and aesthetic considerations, this function will return 0 when the progress string is being rendered.

Returns:
the value representing the spacing between cells
See Also:
setCellSpacing(int), JProgressBar.isStringPainted()

setCellSpacing

protected void setCellSpacing(int cellSpace)

getAmountFull

protected int getAmountFull(Insets b,
                            int width,
                            int height)
This determines the amount of the progress bar that should be filled based on the percent done gathered from the model. This is a common operation so it was abstracted out. It assumes that your progress bar is linear. That is, if you are making a circular progress indicator, you will want to override this method.


paint

public void paint(Graphics g,
                  JComponent c)
Delegates painting to one of two methods: paintDeterminate or paintIndeterminate.

Overrides:
paint in class ComponentUI
Parameters:
g - the Graphics context in which to paint
c - the component being painted; this argument is often ignored, but might be used if the UI object is stateless and shared by multiple components
See Also:
ComponentUI.update(java.awt.Graphics, javax.swing.JComponent)

getBox

protected Rectangle getBox(Rectangle r)
Stores the position and size of the bouncing box that would be painted for the current animation index in r and returns r. Subclasses that add to the painting performed in this class's implementation of paintIndeterminate -- to draw an outline around the bouncing box, for example -- can use this method to get the location of the bouncing box that was just painted. By overriding this method, you have complete control over the size and position of the bouncing box, without having to reimplement paintIndeterminate.

Parameters:
r - the Rectangle instance to be modified; may be null
Returns:
null if no box should be drawn; otherwise, returns the passed-in rectangle (if non-null) or a new rectangle
Since:
1.4
See Also:
setAnimationIndex(int)

getBoxLength

protected int getBoxLength(int availableLength,
                           int otherDimension)
Returns the length of the "bouncing box" to be painted. This method is invoked by the default implementation of paintIndeterminate to get the width (if the progress bar is horizontal) or height (if vertical) of the box. For example:
boxRect.width = getBoxLength(componentInnards.width,
                             componentInnards.height);
 

Parameters:
availableLength - the amount of space available for the bouncing box to move in; for a horizontal progress bar, for example, this should be the inside width of the progress bar (the component width minus borders)
otherDimension - for a horizontal progress bar, this should be the inside height of the progress bar; this value might be used to constrain or determine the return value
Returns:
the size of the box dimension being determined; must be no larger than availableLength
Since:
1.5
See Also:
SwingUtilities.calculateInnerArea(javax.swing.JComponent, java.awt.Rectangle)

paintIndeterminate

protected void paintIndeterminate(Graphics g,
                                  JComponent c)
All purpose paint method that should do the right thing for all linear bouncing-box progress bars. Override this if you are making another kind of progress bar.

Since:
1.4
See Also:
paintDeterminate(java.awt.Graphics, javax.swing.JComponent)

paintDeterminate

protected void paintDeterminate(Graphics g,
                                JComponent c)
All purpose paint method that should do the right thing for almost all linear, determinate progress bars. By setting a few values in the defaults table, things should work just fine to paint your progress bar. Naturally, override this if you are making a circular or semi-circular progress bar.

Since:
1.4
See Also:
paintIndeterminate(java.awt.Graphics, javax.swing.JComponent)

paintString

protected void paintString(Graphics g,
                           int x,
                           int y,
                           int width,
                           int height,
                           int amountFull,
                           Insets b)

getStringPlacement

protected Point getStringPlacement(Graphics g,
                                   String progressString,
                                   int x,
                                   int y,
                                   int width,
                                   int height)
Designate the place where the progress string will be painted. This implementation places it at the center of the progress bar (in both x and y). Override this if you want to right, left, top, or bottom align the progress string or if you need to nudge it around for any reason.


getPreferredSize

public Dimension getPreferredSize(JComponent c)
Description copied from class: ComponentUI
Returns the specified component's preferred size appropriate for the look and feel. If null is returned, the preferred size will be calculated by the component's layout manager instead (this is the preferred approach for any component with a specific layout manager installed). The default implementation of this method returns null.

Overrides:
getPreferredSize in class ComponentUI
Parameters:
c - the component whose preferred size is being queried; this argument is often ignored, but might be used if the UI object is stateless and shared by multiple components
See Also:
JComponent.getPreferredSize(), LayoutManager.preferredLayoutSize(java.awt.Container)

getMinimumSize

public Dimension getMinimumSize(JComponent c)
The Minimum size for this component is 10. The rationale here is that there should be at least one pixel per 10 percent.

Overrides:
getMinimumSize in class ComponentUI
Parameters:
c - the component whose minimum size is being queried; this argument is often ignored, but might be used if the UI object is stateless and shared by multiple components
Returns:
a Dimension object or null
See Also:
JComponent.getMinimumSize(), LayoutManager.minimumLayoutSize(java.awt.Container), ComponentUI.getPreferredSize(javax.swing.JComponent)

getMaximumSize

public Dimension getMaximumSize(JComponent c)
Description copied from class: ComponentUI
Returns the specified component's maximum size appropriate for the look and feel. If null is returned, the maximum size will be calculated by the component's layout manager instead (this is the preferred approach for any component with a specific layout manager installed). The default implementation of this method invokes getPreferredSize and returns that value.

Overrides:
getMaximumSize in class ComponentUI
Parameters:
c - the component whose maximum size is being queried; this argument is often ignored, but might be used if the UI object is stateless and shared by multiple components
Returns:
a Dimension object or null
See Also:
JComponent.getMaximumSize(), LayoutManager2.maximumLayoutSize(java.awt.Container)

getAnimationIndex

protected int getAnimationIndex()
Gets the index of the current animation frame.

Since:
1.4

getFrameCount

protected final int getFrameCount()
Returns the number of frames for the complete animation loop used by an indeterminate JProgessBar. The progress chunk will go from one end to the other and back during the entire loop. This visual behavior may be changed by subclasses in other Look and Feels.

Returns:
the number of frames
Since:
1.6

setAnimationIndex

protected void setAnimationIndex(int newValue)
Sets the index of the current animation frame to the specified value and requests that the progress bar be repainted. Subclasses that don't use the default painting code might need to override this method to change the way that the repaint method is invoked.

Parameters:
newValue - the new animation index; no checking is performed on its value
Since:
1.4
See Also:
incrementAnimationIndex()

incrementAnimationIndex

protected void incrementAnimationIndex()
Sets the index of the current animation frame, to the next valid value, which results in the progress bar being repainted. The next valid value is, by default, the current animation index plus one. If the new value would be too large, this method sets the index to 0. Subclasses might need to override this method to ensure that the index does not go over the number of frames needed for the particular progress bar instance. This method is invoked by the default animation thread every X milliseconds, where X is specified by the "ProgressBar.repaintInterval" UI default.

Since:
1.4
See Also:
setAnimationIndex(int)

Java™ Platform
Standard Ed. 6

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