Largest Provider of Commercial Smalltalk
Cincom is one of the largest commercial providers of Smalltalk, with twice as many partners and customers than other commercial providers.

Tom Nies

Get Started

ObjectStudio’s MarqueeDialog

Posted on in Categories ObjectStudio, Windows-Centric


  • No more primitives—100% Smalltalk code.
  • The code can be changed at any time.
  • It makes it easier for Support to send fixes to customers.
  • Customers can now overwrite or change the code to their liking.
  • Easy enhancements of features not yet implemented.


The MarqueeDialog is the first widget we would like to focus on.  The marquee is a bar that shows some simple animation while a larger process is being performed, and the system seems to be idle. The marquee shows you that the system is working, so you don’t need to panic. Unlike a typical progress bar, the marquee style does not show you how much of the task is complete. It’s useful to indicate activity when you don’t have a clear set of steps from start to finish.

A typical example of a marquee is:

Using this marquee dialog in your application is actually very simple.


To create a new MarqueeDialog, you have the option of the following two methods:

  1. createTitle: aString, or
  2. createTitle: aString position: aPosition extent: anExtent in which aPosition and anExtent are Point objects.

When you use “MarqueeDialog createTitle: ‘Database Query’,” you create a dialog that will appear at position 225@475 and with a size of 1160@350. It will look like this:

By using “MarqueeDialog createTitle: ‘Database Query’ position: 400@800 extent: 1300@250.”, you define where you want the dialog and the size of it. In this case you get:

Once you have a MarqueeDialog instance, you can send it the “showWhile:

marquee := MarqueeDialog
createTitle: 'Database Query'
position: 400@800
extent: 1300@250.
marquee showWhile:
[self someTimeConsumingCode]

As long as the code in the showWhile block is executing, the marquee dialog animation will be shown. When the code execution finishes, the dialog will close.