I have just implemented WPF fold/unfold functionality using Reactive Extensions Framework (RX). Desired algorithm is to "unfold" wpf window, as soon, as mouse entered, and "fold" after 5 seconds of mouse leaving.
First, naive implementation:
This implementation contains a bug, when you move mouse in/out several times in 5sec interval, window can left collapsed, because old "collapse" events will arrive, after delay.
Here is RX implementation, that discards "fold" messages, as soon, as new "fold" messages has arrived:
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