Tree.clear() | LuaRT free and open source Windows programming framework for Lua

Tree:clear() method

Remove all items and subitems from the Tree.

Return value

This function returns no value.

Example


local ui = require "ui"

-- create a simple Window 
local win = ui.Window("Tree:clear() sample", "fixed", 410, 220)
local label = ui.Label(win, "New item  :", 10, 25)
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)
local clearbtn = ui.Button(win, "Clear all", tree.x+tree.width+6, label.y-4)

function clearbtn:onClick()
	tree:clear()
end

function tree:onChange()
	win:status("Tree.count = "..tree.count)
end

function button:onClick()
	-- add new item in the Tree adn 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

entry:onChange()
tree:onChange()
win:show()

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