Module java.desktop
Package javax.swing.plaf.basic

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.

  • Field Details

  • Constructor Details

  • Method Details

    • 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
      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()
      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)