How I can add an additional condition for a certain keyboard key, to a WPF MouseLeftButtonDown event-handler?
For example Ctrl + key
private void Grid_MouseLeftButtonDown(object sender, MouseButtonEventArgs e)
{
...
}
Ctrl key press condition in WPF MouseLeftButtonDown event-handler
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4 Answers
As Grzegorz Godlewski said above, Keyboard.Modifiers.HasFlag(ModifierKey.Control) can be used.
Although @l33t points out it is not very performant, in the comment it appears there have been improvements in the performance of HasFlag in .NET 4.5/4.6. (see benchmarks results in What is it that makes Enum.HasFlag so slow? and the comments below, and also in this answer).
But still nothing as fast as doing a native check (i.e. flagsToCheck & flag != 0 ) judging by the conclusion here.
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