Livecode：两种不同的按钮功能取决于之前是否单击过

Question

在 Livecode 中，我试图让一个按钮使用 "connect"/"disconnect" 函数。我怎样才能让按钮知道它之前是否已经被点击过，执行代码 A 然后，当再次点击时，应该执行代码 B？在"connected"和"disconnected"

之间需要点击几次按钮

Answer 1

如果您使用的是标准按钮并且只有两种状态 (disconnected/connected)，一个简单的方法是禁用按钮的 autoHilite 属性并手动设置按钮的 hilite它的脚本：

on mouseUp
   set the hilite of me to not the hilite of me
   if the hilite of me then
       -- do connecting stuff here
   else
       -- do disconnecting stuff here
   end if
end mouseUp

您没有解释为什么需要多次单击按钮，但是假设您需要两个以上的连接状态，您可以使用自定义属性来存储当前状态。例如，您可以为每个值使用 'empty'（断开连接）、'handshaking'（启动进程）、'connecting'（进程中）和 'linked'（连接）的值状态。类似于：

# STORE CURRENT CONNECTING STATE IN connectionState

on mouseUp
   switch the connectionState of me
      case empty
         -- start connection process, show HANDSHAKING feedback here
         hilite me
         set the connectionState of me to "handshaking"
      break
      case "handshaking"
         -- if initial handshake successful, begin connecting to system
         if handShakeSuccessful is true then
             -- start connection process, show CONNECTING feedback here
             set the connectionState of me to "connecting"
         end if
      break
      case "connecting"
         -- if initial connection is successful, show LINKED feedback here
         if connectionSuccessful is true then
            set the connectionState of me to "linked"
         end if
      break
      case "linked"
         -- do disconnecting stuff here
         set the connectionState of me to empty
         unhilite me
   end switch
end mouseUp

Answer 2

在 ChatRev 堆栈中，我们使用按钮的标签来指示其状态。

if the label of me is "Connect" then
  set the label of me to "Disconnect"
  open socket gSocket
  write "helo" & cr to socket gSocket
  read from socket gSocket with message "connected"
else // "Disconnect"
  set the label of me to "Connect"
  write "disconnect" to socket gSocket
  repeat for each line myLine in the openSockets
    close socket myLine
  end repeat
end if

如果标签为 "Connected"，则应关闭连接；如果标签为 "Connect"，则应建立连接。

Answer 3

我通常在这种情况下使用 setProp 处理程序。该按钮仅用作 "toggle" 开关。

# the button script
on mouseUp
   set the uConnectedState of this cd to not the uConnectedState of this cd
end mouseUp

# in the card script (or wherever appropriate)
setProp uConnectedState pIsConnected
   if pIsConnected then
      set the label of btn "connect" to "Disconnect"
      # any other interface updates or logic here
   else
      set the label of btn "connect" to "Connect"
      # any other interface updates or logic here
   end if
   pass uConnectedState
end uConnectedState

这样做意味着我所要做的就是设置自定义属性，所有业务都由 setProp 处理程序处理。例如，如果我需要在 openCard 上初始化连接，我所要做的就是将卡的 uConnectedState 设置为 false/true.

Livecode：两种不同的按钮功能取决于之前是否单击过

Livecode: Two different button functions depending if clicked before

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