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Java Standard Edition (SE)

ProgressMonitor


javax.swing

Class ProgressMonitor

  • All Implemented Interfaces:
    Accessible


    public class ProgressMonitor
    extends Object
    implements Accessible
    A class to monitor the progress of some operation. If it looks like the operation will take a while, a progress dialog will be popped up. When the ProgressMonitor is created it is given a numeric range and a descriptive string. As the operation progresses, call the setProgress method to indicate how far along the [min,max] range the operation is. Initially, there is no ProgressDialog. After the first millisToDecideToPopup milliseconds (default 500) the progress monitor will predict how long the operation will take. If it is longer than millisToPopup (default 2000, 2 seconds) a ProgressDialog will be popped up.

    From time to time, when the Dialog box is visible, the progress bar will be updated when setProgress is called. setProgress won't always update the progress bar, it will only be done if the amount of progress is visibly significant.

    For further documentation and examples see How to Monitor Progress, a section in The Java Tutorial.

    See Also:
    ProgressMonitorInputStream
    • Nested Class Summary

      Nested Classes 
      Modifier and Type Class and Description
      protected class  ProgressMonitor.AccessibleProgressMonitor
      AccessibleProgressMonitor implements accessibility support for the ProgressMonitor class.
    • Constructor Summary

      Constructors 
      Constructor and Description
      ProgressMonitor(Component parentComponent, Object message, String note, int min, int max)
      Constructs a graphic object that shows progress, typically by filling in a rectangular bar as the process nears completion.
    • Field Detail

      • accessibleContext

        protected AccessibleContext accessibleContext
        The AccessibleContext for the ProgressMonitor
        Since:
        1.5
    • Constructor Detail

      • ProgressMonitor

        public ProgressMonitor(Component parentComponent,
                               Object message,
                               String note,
                               int min,
                               int max)
        Constructs a graphic object that shows progress, typically by filling in a rectangular bar as the process nears completion.
        Parameters:
        parentComponent - the parent component for the dialog box
        message - a descriptive message that will be shown to the user to indicate what operation is being monitored. This does not change as the operation progresses. See the message parameters to methods in JOptionPane.message for the range of values.
        note - a short note describing the state of the operation. As the operation progresses, you can call setNote to change the note displayed. This is used, for example, in operations that iterate through a list of files to show the name of the file being processes. If note is initially null, there will be no note line in the dialog box and setNote will be ineffective
        min - the lower bound of the range
        max - the upper bound of the range
        See Also:
        JDialog, JOptionPane
    • Method Detail

      • setProgress

        public void setProgress(int nv)
        Indicate the progress of the operation being monitored. If the specified value is >= the maximum, the progress monitor is closed.
        Parameters:
        nv - an int specifying the current value, between the maximum and minimum specified for this component
        See Also:
        setMinimum(int), setMaximum(int), close()
      • close

        public void close()
        Indicate that the operation is complete. This happens automatically when the value set by setProgress is >= max, but it may be called earlier if the operation ends early.
      • getMinimum

        public int getMinimum()
        Returns the minimum value -- the lower end of the progress value.
        Returns:
        an int representing the minimum value
        See Also:
        setMinimum(int)
      • setMinimum

        public void setMinimum(int m)
        Specifies the minimum value.
        Parameters:
        m - an int specifying the minimum value
        See Also:
        getMinimum()
      • getMaximum

        public int getMaximum()
        Returns the maximum value -- the higher end of the progress value.
        Returns:
        an int representing the maximum value
        See Also:
        setMaximum(int)
      • setMaximum

        public void setMaximum(int m)
        Specifies the maximum value.
        Parameters:
        m - an int specifying the maximum value
        See Also:
        getMaximum()
      • isCanceled

        public boolean isCanceled()
        Returns true if the user hits the Cancel button in the progress dialog.
      • setMillisToDecideToPopup

        public void setMillisToDecideToPopup(int millisToDecideToPopup)
        Specifies the amount of time to wait before deciding whether or not to popup a progress monitor.
        Parameters:
        millisToDecideToPopup - an int specifying the time to wait, in milliseconds
        See Also:
        getMillisToDecideToPopup()
      • getMillisToDecideToPopup

        public int getMillisToDecideToPopup()
        Returns the amount of time this object waits before deciding whether or not to popup a progress monitor.
        See Also:
        setMillisToDecideToPopup(int)
      • setMillisToPopup

        public void setMillisToPopup(int millisToPopup)
        Specifies the amount of time it will take for the popup to appear. (If the predicted time remaining is less than this time, the popup won't be displayed.)
        Parameters:
        millisToPopup - an int specifying the time in milliseconds
        See Also:
        getMillisToPopup()
      • getMillisToPopup

        public int getMillisToPopup()
        Returns the amount of time it will take for the popup to appear.
        See Also:
        setMillisToPopup(int)
      • setNote

        public void setNote(String note)
        Specifies the additional note that is displayed along with the progress message. Used, for example, to show which file the is currently being copied during a multiple-file copy.
        Parameters:
        note - a String specifying the note to display
        See Also:
        getNote()
      • getNote

        public String getNote()
        Specifies the additional note that is displayed along with the progress message.
        Returns:
        a String specifying the note to display
        See Also:
        setNote(java.lang.String)
      • getAccessibleContext

        public AccessibleContext getAccessibleContext()
        Gets the AccessibleContext for the ProgressMonitor
        Specified by:
        getAccessibleContext in interface Accessible
        Returns:
        the AccessibleContext for the ProgressMonitor
        Since:
        1.5


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