Toolbar Items

library(blockr.dag)

The toolbar provides quick access to common graph operations.

Available Actions

The toolbar includes several default operations:

• Zoom in/out - Navigate large workflows.
• Auto fit - Fit entire graph to view.
• Layout - Reset graph layout.
• Add block - Trigger create new blocks.
• Add stack - Trigger create stack.
• Remove selected - Delete selected elements (can be stacks, blocks and links)

Creating Toolbar Items

Toolbar items are declared via new_toolbar_item():

# Toolbar item
item <- new_toolbar_item(
  id = "custom_tool",
  icon = "icon-custom",
  js = "console.log('Custom tool clicked')",
  action = function(board, update, ...) {
    # Server-side logic
  }
)

js can be a string representing a JavaScript function or an R function that takes the namespace ns as input and returns a string:

function(ns) {
  sprintf(
    "(value, target, current) => {
      Shiny.setInputValue('%s', true, {priority: 'event'});
    }",
    ns("add_block")
  )
}

Any new item has to go inside toolbar_items.dag_extension for registration:

toolbar_items.dag_extension <- function(x) {
  list(
    item
  )