Class BasicProgressBarUI

• java.lang.Object
• • javax.swing.plaf.ComponentUI
  • • javax.swing.plaf.ProgressBarUI
    • • javax.swing.plaf.basic.BasicProgressBarUI

Direct Known Subclasses:

MetalProgressBarUI, SynthProgressBarUI

public class BasicProgressBarUI
extends ProgressBarUI

A Basic L&F implementation of ProgressBarUI.

Nested Classes

Nested Classes

Modifier and Type	Class and Description
class	BasicProgressBarUI.ChangeHandler This class should be treated as a "protected" inner class.

Fields

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

Constructors

BasicProgressBarUI

public BasicProgressBarUI()

Methods

createUI

public static ComponentUI createUI(JComponent x)

installUI

public void installUI(JComponent c)

Description copied from class: ComponentUI

Configures the specified component appropriately 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 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:

• The progress bar is determinate and becomes displayable
• The progress bar is displayable and becomes determinate
• The progress bar is displayable and determinate and this UI is installed

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:

• The progress bar changes to determinate
• The progress bar is no longer part of a displayable hierarchy
• This UI in uninstalled

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 individual 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)