| l_bind_item {loon} | R Documentation |
Create a Canvas Binding
Description
Canvas bindings are triggered by a mouse/keyboard gesture over the plot as a whole.
Usage
l_bind_item(widget, tags, event, callback)
Arguments
widget |
widget path as a string or as an object handle |
tags |
item tags as as explained in
|
event |
event patterns as defined for Tk canvas widget https://www.tcl.tk/man/tcl8.6/TkCmd/bind.htm#M5. |
callback |
callback function is an R function which is called by the Tcl interpreter if the event of interest happens. Note that in loon the callback functions support different optional arguments depending on the binding type, read the details for more information |
Details
Item bindings are used for evaluating callbacks at certain mouse and/or keyboard gestures events (i.e. X events) on visual items on the canvas. Items on the canvas can have tags and item bindings are specified to be evaluated at certain X events for items with specific tags.
Note that item bindings get currently evaluated in the order that they are added.
Bindings, callbacks, and binding substitutions are described in detail in
loon's documentation webpage, i.e. run l_help("learn_R_bind")
Value
item binding id
See Also
l_bind_item_ids, l_bind_item_get,
l_bind_item_delete, l_bind_item_reorder