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keeping_gui_elements_updated [2008/05/01 11:11]
cannam created |
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| [[http://sourceforge.net/mailarchive/message.php?msg_name=200706112350.09420.glaurent%40telegraph-road.org|Mail archive link]] | |
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| <code> | |
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| Keeping GUI elements updated, e.g. notifying the NotationView if a | |
| segment has changed, is done through the RefreshStatus class. This | |
| class holds a set of 'observer IDs'. Every Segment carries a | |
| RefreshStatus, and every edit part displaying one has an observer ID. | |
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| Whenever a change is made in a segment, its RefreshStatus is set to | |
| 'has changed' for all observer IDs. Then each observer, whenever it's | |
| refreshed, checks its status ID to see if the segment it displays has | |
| changed since last update. This is done in EditViewBase::paintEvent(). | |
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| It certainly could have been done better, but it works :-). | |
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| </code> | |
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