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63 lines
1.1 KiB
63 lines
1.1 KiB
class DataTable
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def initialize(data)
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@data = data.map { |row| row.dup.freeze }.freeze
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end
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def item(row, col)
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return nil unless valid_row?(row) && valid_col?(col)
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@data[row][col]
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end
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def rows_count
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@data.size
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end
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def columns_count
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return 0 if @data.empty?
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@data.first.size
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end
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private
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def valid_row?(row)
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row.between?(0, rows_count - 1)
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end
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def valid_col?(col)
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col.between?(0, columns_count - 1)
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end
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end
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class DataList
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def initialize(items)
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@items = items.dup.freeze
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@selected = []
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end
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def select(number)
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index = number.to_i
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toggle_selection(index) if valid_index?(index)
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end
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def get_selected
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@selected.dup
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end
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def get_names
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raise NotImplementedError, "Implement this method in a subclass"
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end
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def get_data
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raise NotImplementedError, "Implement this method in a subclass"
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end
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private
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def valid_index?(index)
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index.between?(0, @items.size - 1)
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end
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def toggle_selection(index)
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@selected.include?(index) ? @selected.delete(index) : @selected << index
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end
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end |