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redraw problem |
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douglashogan 
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Joined: 02 July 2003 Location: Switzerland Status: Offline Points: 62 |
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 Topic: redraw problemPosted: 04 February 2006 at 6:40am |
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I change the text in one of the cells of the report control using SetValue, it doesn't redraw automatically. I currrently have to call redrawwindow for the entire control to update it. What am i doing wrong? Also, I would like to embed a custom draw gauge control in a cell. Is this possible? If so, are there any examples of similar. |
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Douglas Hogan |
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sserge
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Joined: 01 December 2004 Status: Offline Points: 1297 |
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Posted: 04 February 2006 at 7:13am |
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Hi,
It's not incorrect behavior. Imagine that you'd like to change a number of report control cells values in a loop. If it would be automatically redrawn, you'll see a heavy flickering. So, to avoid that a user has a choice when to call Redraw method. Yes, of course it is possible to make custom drawn items. You'll have to derive your class from CXTPReportRecordItem and write custom implementation for Draw() method and some others (like mouse events handlers, etc). -- WBR, Serge |
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douglashogan
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Joined: 02 July 2003 Location: Switzerland Status: Offline Points: 62 |
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Posted: 04 February 2006 at 7:44am |
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Thanks for the reply, But why do I have to redraw the ENTIRE control. I just want to invalidate the cell. I have a % indicator which grows as a download proceeds. There are tons of messages coming in and redrawing the entire control every time i get an update message is very inefficient. Is there no way to invalidate/redraw a single cell? |
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Regards
Douglas Hogan |
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sserge
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Posted: 04 February 2006 at 10:30am |
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Douglas,
There are no ways to redraw a single cell, but the entire operation is optimized internally. However, if redrawing a control on every your custom message looks inefficient for you, try using some kind of a workaround - for example redraw a control N times per second by timer, what definitely will be fast enough with reasonable N (5 for example). -- WBR, Serge |
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