l_bind_canvas_get {loon}

Get the event pattern and callback Tcl code of a canvas binding

Description

This function returns the registered event pattern and the Tcl callback code that the Tcl interpreter evaluates after a event occurs that matches the event pattern.

Usage

l_bind_canvas_get(widget, id)

Arguments

widget

widget path as a string or as an object handle

id

canvas binding id

Details

Bindings, callbacks, and binding substitutions are described in detail in loon's documentation webpage, i.e. run l_help("learn_R_bind")

Value

Character vector of length two. First element is the event pattern, the second element is the Tcl callback code.

See Also

l_bind_canvas, l_bind_canvas_ids, l_bind_canvas_delete, l_bind_canvas_reorder

Examples

# binding for when plot is resized
if(interactive()){
p <- l_plot(iris[,1:2], color=iris$Species)

printSize <- function(p) {
    size <- l_size(p)
    cat(paste('Size of widget ', p, ' is: ',
              size[1], 'x', size[2], ' pixels\n', sep=''))
}

l_bind_canvas(p, event='<Configure>', function(W) {printSize(W)})

id <- l_bind_canvas_ids(p)
id

l_bind_canvas_get(p, id)

}