删除所有层时的SketchUp Ruby ArgumentError

Question

我创建了一个脚本来删除从.dwg文件中导入的所有层：

# import the dwg file
show_summary = false
if Sketchup.active_model.import file_path, show_summary

    # delete all layer
    protected_layers = ['Layer0', '! 3D', '! AutoCad']
    10.times do
        Sketchup.active_model.definitions.purge_unused
        Sketchup.active_model.layers.purge_unused

        Sketchup.active_model.layers.each { |layer|
            layer_name = layer.name
            if not layer.deleted? and not protected_layers.include? layer_name  
                puts "\tdeleted"
                Sketchup.active_model.layers.remove layer
            end
        }
    end
end

当我导入一个大的dwg文件时，所有的层都不是立即导入的(大约100层).因此，我向所有层添加了一个10.times循环，并将其完全删除。我的脚本工作得很好，直到剩下10层。我遇到了这样一个错误：

Error: #<ArgumentError: layer doesn't belong to this model>

那么如何检查我的图层还没有被删除呢？我尝试了这些解决方案，但似乎没有人工作。

• layer.deleted?不返回true
• layers.at layer.name不返回nil
• begin;rescue;end循环崩溃草图

Answer 1

您正在迭代要从其中删除元素的集合。这绝不是一件安全的事。

将这些层缓存到一个数组中，然后进行迭代。

下面是一个示例：

model = Sketchup.active_model
# Map layer names to layers - as object comparison is much faster than string
# comparisons.
protected_layers = ['Layer0', '! 3D', '! AutoCad'].map { |layer_name|
  model.layers[layer_name]
}
# Start an operation as this keeps the undo stack clean and makes the script
# fun faster.
model.start_operation('Remove Layers', true)
model.layers.to_a.each { |layer|
  next if layer.deleted? || protected_layers.include?(layer)
  model.layers.remove(layer)
}
model.commit_operation

Answer 2

我创建了一个使用Sketchup.active_model.layers[l.name].nil? wich的解决方案，层已经被移除。这里是我的解决方案的样本

layers.take_while{|l| not l.deleted? and not layers[l.name].nil? }.each { |layer|
    puts layer.name
    unless protected_layers.include? layer.name  
        puts "\t[*] deleted"
        layers.remove layer
    else
        puts "\t[ ] undeleted"
    end
}