[Nim] Bsp. Layout mit mehreren Panels

import wnim/[wApp, wFrame, wPanel, wButton, wListCtrl]

let app = App()
let frame = Frame(title="Three Panels")
let panel1 = Panel(frame)
let panel2 = Panel(frame)
let panel3 = Panel(frame)

panel1.backgroundColor = 0xFEFEFE
panel2.backgroundColor = 0xF6F6F6
panel3.backgroundColor = 0xF0F0F0

let bt1 = Button(panel1, label="Button 1", pos=(10,10), size=(60,25))
let bt2 = Button(panel2, label="Button 2", pos=(10,10), size=(60,25))
let lc = ListCtrl(panel3, style=wLcReport or wBorderDouble or wLcSingleSel)
lc.appendColumn("Colum", width=wListAutosize)
lc.setColumnFormat(0, wListFormatCenter) 
for i in 1..20:
  lc.appendItem($i)

proc layout() =
  frame.layout:
    panel1:
      left = 0
      top = 0
      height = frame.height / 2
      width = frame.width / 2
    panel2:
      left = 0
      top = frame.height / 2
      height = frame.height / 2
      width = frame.width / 2
    panel3:
      left = frame.width / 2
      top = 0
      height = frame.height
      width = frame.width / 2
  panel3.layout:
    lc:
      left = panel3.left + 10 
      top = panel3.top + 10
      height = panel3.height - 20
      width = panel3.width - 20


frame.wIdExit do ():
  frame.delete()

frame.wEvent_Size do ():
  layout()

layout()
frame.center()
frame.show()
app.mainLoop()