One way I did it was making a Singleton class that popups up a small
TitleWindow. This TitleWindow has a ProgressBar in it. The ProgressBar's
indeterminate is bound to the visibility (you don't want it playing while
the window is invisible; takes up resources). You can then do:
WaitWindow.showProgress("Loading...");
Inside, it'll create a popup if none exists, and put the text in there.
It's modal by default. You can then later go:
WaitWindow.remove();
And if one exists, it'll remove it. Subsequent calls to showProgress merely
update the text. You can use this for changed commands.
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