Tree:add()

Tree:add()method

Add one or more root items to the Tree.

Return value

This function returns the last added TreeItem

Example


--! luart-extensions
import ui

-- create a simple Window 
local win = ui.Window("Tree:add() sample", "fixed", 340, 200)
local label = ui.Label(win, "New item  :", 10, 30)
local entry =  ui.Entry(win, "", label.x+label.width+6, label.y-4)
local button = ui.Button(win, "Add item", entry.x+entry.width+6, label.y-6)
local tree = ui.Tree(win, {}, button.x+button.width+6, label.y-4)

button.enabled = false

function button:onClick()
	-- add new item in the Tree and select it
	tree.selected = tree:add(entry.text)
	entry.text = ""
end

-- enable button only if entry.text is not empty
function entry:onChange()
	button.enabled = #entry.text > 0
end

entry.onSelect = button.onClick
win:show()

-- update user interface
repeat
	ui.update()
until not win.visible