Class BasicProgressBarUI

Fields

progressBar

protected JProgressBar progressBar

The instance of JProgressBar.

changeListener

protected ChangeListener changeListener

The instance of 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)

Returns a new instance of BasicProgressBarUI.

Parameters:

x - a component

Returns:

a new instance of BasicProgressBarUI

installDefaults

protected void installDefaults()

Installs default properties.

uninstallDefaults

protected void uninstallDefaults()

Unintalls default properties.

installListeners

protected void installListeners()

Registers listeners.

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

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

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()

Returns preferred size of the horizontal JProgressBar.

Returns:

preferred size of the horizontal JProgressBar

getPreferredInnerVertical

protected Dimension getPreferredInnerVertical()

Returns preferred size of the vertical JProgressBar.

Returns:

preferred size of the vertical JProgressBar

getSelectionForeground

protected Color getSelectionForeground()

The "selectionForeground" is the color of the text when it is painted over a filled area of the progress bar.

Returns:

the color of the selected foreground

getSelectionBackground

protected Color getSelectionBackground()

The "selectionBackground" is the color of the text when it is painted over an unfilled area of the progress bar.

Returns:

the color of the selected background

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)

Sets the cell length.

Parameters:

cellLen - a new cell length

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)

Sets the cell spacing.

Parameters:

cellSpace - a new cell spacing

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.

Parameters:

b - insets

width - a width

height - a height

Returns:

the amount of the progress bar that should be filled

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.

Parameters:

g - an instance of Graphics

c - a component

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.

Parameters:

g - an instance of Graphics

c - a component

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)

Paints the progress string.

Parameters:

g - an instance of Graphics

x - X location of bounding box

y - Y location of bounding box

width - width of bounding box

height - height of bounding box

amountFull - size of the fill region, either width or height depending upon orientation.

b - Insets of the progress bar.

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.

Parameters:

g - an instance of Graphics

progressString - a text

x - an X coordinate

y - an Y coordinate

width - a width

height - a height

Returns:

the place where the progress string will be painted

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)

getAnimationIndex

protected int getAnimationIndex()

Gets the index of the current animation frame.

Returns:

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)