Class ProgressMonitor

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.

Fields

accessibleContext

protected AccessibleContext accessibleContext

The AccessibleContext for the ProgressMonitor

Since:

1.5

Constructors

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

Methods

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