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    <p>I think it's important that your main progress bar fill up exactly once, and there is always indication of progress.</p> <p>I've just recently done something very similar at work. The tasks were long, with many subtasks. The interface I ended up with was a double progress bar, which were actually the first and last of a stack of progress bars.</p> <p>The API is something like</p> <pre><code>StartNewTask(Caption,NumberOfSubtasks) EndTask SetProgress(Caption,NumberOfSubtasksFinished) </code></pre> <p><code>StartNewTask</code> pushes a new bar on the stack, and <code>EndTask</code> pops one.</p> <p>SetProgress sets the progress of the most-recently-pushed progress bar, and ripples up the changes to parent bars. For example:</p> <pre><code>StartNewTask('Doing 2 things',2) SetProgress('Done 1 now',1) StartNewTask('Big Subtask',40) ... SetProgress('Done some subtasks',10) </code></pre> <p>Now, there are 2 progress bars shown, the second at 25% (10/40) and the first at 62.5% (1/2 + 10/40*2)</p> <p>Like I said above, if you've got >2 tasks in the stack, I only show the first and last (first gives overall progress and never goes backwards, second gives indication of current activity)</p> <p>You could extend this by giving a weighting to each subtask, i.e.</p> <pre><code>StartNewTask(Caption,[ListOfSubTaskWeightings]) </code></pre> <p>To make the top progress bar smoother.</p> <p>Additionally, developers can show all progress bars to see why it takes ages, and I think you could make decent logs out of it.</p>
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    1. POHow to design a good "progress panel"
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