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where does the SWT PaintEvent come from and how to influence it

Answer 1

+1 A:

PaintEvents are generated by SWT for you each time it's needed. For example the first time a widget is displayed or after a widget is becoming visible again beacause a window has been moved.

You can force paint event to occur on a Control using:

control.redraw();
control.update();

See here: http://help.eclipse.org/helios/topic/org.eclipse.platform.doc.isv/reference/api/org/eclipse/swt/widgets/Control.html#redraw()

Manuel Selva 2010-10-04 14:58:39

Thank you, im aware of the 'redraw()' and 'update()' methods. If I understand the API correctly, the first one just marks the wiget for processing when the next pain request comes and the seconde one forces all outstanding requests to be processed. Neither of them has influence on the generation of the requests. So, that does not answer my question. Maybe you could elaborate on your first part "generated by SWT" and "each time its needed". By which part of SWT? And how is the need determined?

kostja 2010-10-05 06:41:49

@kostja I think SWT doesn't really generate these paint events himself but rely on the underlying Window System (motif, gtk or Windows). Why does the redraw/update doesn't fit your needs ?

Manuel Selva 2010-10-05 07:01:24

I want to achieve consistent framerates across different systems, so I thought a good idea would be to get hold of the PaintEvent generation and control it with timerExec() or similar. Maybe there is a better way to do it?

kostja 2010-10-05 07:59:06

Just do that with redraw() and update(). Create a timeExec calling redraw() and then update() on your widget and this will generate a paint event for you. I still don't get your problem using this solution.

Manuel Selva 2010-10-05 10:34:49

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where does the SWT PaintEvent come from and how to influence it

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