2.7.1 ProgressBar Objects

Python 2.4

2.7.1 ProgressBar Objects

ProgressBar objects provide support for modeless progress-bar dialogs. Both determinate (thermometer style) and indeterminate (barber-pole style) progress bars are supported. The bar will be determinate if its maximum value is greater than zero; otherwise it will be indeterminate. Changed in version 2.2: Support for indeterminate-style progress bars was added.

The dialog is displayed immediately after creation. If the dialog's ``Cancel'' button is pressed, or if Cmd-. or ESC is typed, the dialog window is hidden and KeyboardInterrupt is raised (but note that this response does not occur until the progress bar is next updated, typically via a call to inc() or set()). Otherwise, the bar remains visible until the ProgressBar object is discarded.

ProgressBar objects possess the following attributes and methods:

The current value (of type integer or long integer) of the progress bar. The normal access methods coerce curval between 0 and maxval. This attribute should not be altered directly.

The maximum value (of type integer or long integer) of the progress bar; the progress bar (thermometer style) is full when curval equals maxval. If maxval is 0, the bar will be indeterminate (barber-pole). This attribute should not be altered directly.

Sets the text in the title bar of the progress dialog to newstr.

Sets the text in the progress box of the progress dialog to newstr.

Sets the progress bar's curval to value, and also maxval to max if the latter is provided. value is first coerced between 0 and maxval. The thermometer bar is updated to reflect the changes, including a change from indeterminate to determinate or vice versa.

Increments the progress bar's curval by n, or by 1 if n is not provided. (Note that n may be negative, in which case the effect is a decrement.) The progress bar is updated to reflect the change. If the bar is indeterminate, this causes one ``spin'' of the barber pole. The resulting curval is coerced between 0 and maxval if incrementing causes it to fall outside this range.
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