ruby-on-rails - 调试Prawn到达图形状态堆栈的末尾

Question

class Report
  attr_reader :pdf
  def to_pdf
    Prawn::Document.new(page_layout: page_layout) do |pdf|
      @pdf = pdf

      pdf.repeat(:all) do
        frame_page
      end

      pdf.repeat(:all) do
        write_header 
      end
      #write_section_divider
      puts "wrote the header" #this is not getting hit
      write_body

在我的子类中:

def write_header
    puts "Writing header"
    pdf.move_down 8
    pdf.text title, size: 22, style: :bold, align: :center
    puts "wrote title"

    pdf.bounding_box([0, pdf.cursor], width: pdf.bounds.right, height: 28) do
      puts "bounding box"
      pdf.move_down 8
      pdf.text date_title, size: 16, align: :center
      pdf.text current_day_title, size: 16, align: :center
      puts "moved down"
    end

    puts "exited bounding box"
  end


 F, [2015-02-23T02:18:30.106303 #6] FATAL -- :
2015-02-23T02:18:30.106684+00:00 app[web.1]:   app/reports/report.rb:6:in `to_pdf'
2015-02-23T02:18:30.106680+00:00 app[web.1]:   app/reports/report.rb:13:in `block in to_pdf'
2015-02-23T02:18:30.106682+00:00 app[web.1]:   app/reports/report.rb:6:in `new'
2015-02-23T02:18:30.106674+00:00 app[web.1]: Prawn::Errors::EmptyGraphicStateStack (
2015-02-23T02:18:30.106677+00:00 app[web.1]:  You have reached the end of the graphic state stack):
2015-02-23T02:18:30.106690+00:00 app[web.1]:
2015-02-23T02:18:30.106691+00:00 app[web.1]:
2015-02-23T02:18:30.106688+00:00 app[web.1]:   app/controllers/verified_return_money_reports_controller.rb:21:in `create'
2015-02-23T02:18:30.106687+00:00 app[web.1]:   app/reports/verified_return_money_report.rb:6:in `to_pdf'

为什么我的虾画失败了？

Answer 1

您有一个转发器，该转发器应用于每个页面，并且其内容超过一个页面宽度。这就是Prawn告诉您的错误信息，它不是很容易解释。

现在，来自stacktrace的错误来自write_header调用。看来您在该方法上的边界框具有固定的高度(28)，并且其内容更高:两行和move down 8。

尝试扩展bounding_box的高度或使其内容更短。