如何使用按鈕在Roku Scenegraph應用程序中選擇

Question

我正在使用“鍵盤”對話框進行用戶輸入。 我保留了兩個按鈕“確定”和“取消”。 但是在使用buttonSelected它同時使用observeField調用了兩個按鈕。 現在，有人可以告訴我如何使用buttonSelected索引在單擊一個按鈕的同時單擊確定和取消來獲取操作

sub init()
  m.top.backgroundURI = "pkg:/images/rsgde_bg_hd.jpg"

  example = m.top.findNode("instructLabel")

  examplerect = example.boundingRect()
  centerx = (1280 - examplerect.width) / 2
  centery = (720 - examplerect.height) / 2
  example.translation = [ centerx, centery ]

  m.top.setFocus(true)
end sub

sub showdialog()
  keyboarddialog = createObject("roSGNode", "KeyboardDialog")
  keyboarddialog.backgroundUri = "pkg:/images/rsgde_dlg_bg_hd.9.png"
  keyboarddialog.title = "Example Keyboard Dialog"

  keyboarddialog.buttons=["OK","CANCEL"]
  keyboarddialog.optionsDialog=true

  m.top.dialog = keyboarddialog
  print "hello"
 KeyboardDialog.observeField("buttonSelected","onKeyPress")
' KeyboardDialog.observeField("buttonSelected","onKeyPressCancel")
 print "world"
end sub




function onKeyPress()
    print "m.value:::>>"m.top.dialog.text
end Function
function onKeyPressCancel()

    print "Screen should close"
end Function

function onKeyEvent(key as String, press as Boolean) as Boolean
  if press then
    if key = "OK"
      showdialog()

      return true
    end if

    end if


  return false
end function



]]>

Answer 1

在這里，為對話框創建一個功能。 在對話框中寫入觀察字段，其用法如下例：第一個參數是“字段名稱” ，另一個參數是“功能名稱” 。

m.top.dialog.observeField("buttonSelected","onVerifyURL") 。

在功能下方是觀察字段第二參數“ onVerifyURL”的要點 。

sub onVerifyURL()

 if m.top.dialog.buttonSelected = 0

       print "ok button pressed" 'O is called first
       'function call for OK

 else if m.top.dialog.buttonSelected = 1  

       print "cancel button pressed" '1 is called second
       'm.top.dialog.visible = false  
       'm.top.dialog.close = true
       'function call for Cancel

 else
       print "nothing press" ' this is not required for code just write for an understanding

 end if

end sub

Answer 2

您是否檢查過事件中的buttonSelected內部buttonSelected ；-)

Answer 3

使用m.top.dialog.buttonSelected將返回索引值。