-2

我试图从基于选择的条件语句中获取整数list_box。就是不能让它工作。另外，我希望能够删除@acuity = para. 我的代码基于此：list_box 在启动时不会使用默认值 - 鞋子。

Shoes.app :title=> 'Procedural', :width => 300, :height => 200 do 

@list_box = list_box :items => ["1- Ad lib", "2- Assist of SB", "3- Assist of 1", "4- Assist of 2"]                        

   button 'Compute' do
        @acuity.text = @list_box.text
  if @acuity == "1- Ad lib"
        @mobility = 11
  elsif @acuity == "2- Assist of SB"
        @mobility = 22
  elsif @acuity == "3- Assist of 1"
    @mobility = 33
  elsif @acuity == "4- Assist of 2"
    @mobility = 44
  end

      end

    @acuity = para

    end
4

1 回答 1

2

目前尚不清楚您的目标是什么。在某处显示@mobility？仅仅为@mobility 变量赋值就没有任何作用。

Shoes.app do

  @choice_map = {
    "1- Ad lib"       => 11,
    "2- Assist of SB" => 22,
    "3- Assist of 1"  => 33,
    "4- Assist of 2"  => 44
  }

  para "Choose item:"
  @my_listbox = list_box(:items => @choice_map.keys) 

  button 'Compute' do
    @mobility = @choice_map[@my_listbox.text]
  end

end

要证明 @mobility 包含正确的值，您需要在某处显示该值：

Shoes.app do

  @choice_map = {
    "1- Ad lib"       => 11,
    "2- Assist of SB" => 22,
    "3- Assist of 1"  => 33,
    "4- Assist of 2"  => 44
  }

  @my_listbox = list_box(items: @choice_map.keys)

  @my_para = para 'show computed results here'

  button 'Compute' do
    @mobility = @choice_map[@my_listbox.text]
    @my_para.text = @mobility
  end

end

您的代码实际上只需稍作改动即可正常工作：

Shoes.app :title => 'Procedural', :width => 300, :height => 200 do 

@list_box = list_box :items => ["1- Ad lib", "2- Assist of SB", "3- Assist of 1", "4- Assist of 2"]                        

@my_para = para 'show computed results here'

button 'Compute' do
  @acuity = @list_box.text   #<---CHANGE HERE

  if @acuity == "1- Ad lib"
    @mobility = 11
  elsif @acuity == "2- Assist of SB"
    @mobility = 22
  elsif @acuity == "3- Assist of 1"
    @mobility = 33
  elsif @acuity == "4- Assist of 2"
    @mobility = 44
  end

  @my_para.text = @mobility

end

如果您不需要该按钮：

Shoes.app do

  @choice_map = {
    "1- Ad lib"       => 11,
    "2- Assist of SB" => 22,
    "3- Assist of 1"  => 33,
    "4- Assist of 2"  => 44
  }

  para "Choose item:"

  @default = "2- Assist of SB"
  @mobility = @choice_map[@default]

  @my_listbox = list_box(items: @choice_map.keys, choose: @default) do |list|
    @mobility = @choice_map[list.text]
  end

end

提供给 list_box() 的块仅在更改时执行，因此您必须为 @mobility 设置一个初始值。

您会认为类似以下的内容能够检索列表框中的初始值：

Shoes.app do

  @choice_map = {
    "1- Ad lib"       => 11,
    "2- Assist of SB" => 22,
    "3- Assist of 1"  => 33,
    "4- Assist of 2"  => 44
  }

  para "Choose item:"

  @my_listbox = list_box(items: @choice_map.keys) do |list|
    @mobility = @choice_map[list.text]
    @my_para.text = @mobility
  end

  @mobility = @choice_map[@my_listbox.text]
  @my_para = para @mobility 
end

但显然列表框直到应用程序块完成执行后才存在，因此您无法在应用程序块内检索@my_listbox.text。

于 2013-07-21T18:37:21.077 回答