match_key: Match keys from a keyboard event
In ggobi/cranvas: Interactive statistical graphics based on Qt

Description Usage Arguments Value Author(s) References Examples

This is a simple wrapper function to test if the given keys are hit in the keyboard event.

1	match_key(key, event)

`key`	a character vector of key names (see the example below)
`event`	the keyboard event (if missing, the default value comes from the `event` argument of the parent function (`sys.frame(1)`), so if this function is called under a standard callback of a layer event, we can leave this argument blank)

TRUE for the matched keys, and FALSE for those not matched

Yihui Xie <http://yihui.name>

http://doc.qt.nokia.com/latest/qt.html#Key-enum

library(qtbase)
library(qtpaint)
library(cranvas)
key_press <- function(layer, event) {
    print(match_key(c("A", "F", "PageUp", "1"), event))
}
s <- qscene()
r <- qlayer(s, keyPressFun = key_press)
qplotView(scene = s)