Method: Canis::App#loop

Defined in:
lib/canis/core/util/app.rb

#loop(&block) ⇒ Object

This method is called by run, and thus in most cases this is what is used. run calls this without a block not sure, but user shuld be able to trap keystrokes if he wants but do i still call handle_key if he does, or give him total control. But loop is already called by framework



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# File 'lib/canis/core/util/app.rb', line 129

def loop &block
  @form.repaint
  @window.wrefresh
  Ncurses::Panel.update_panels
  @break_key = ?\C-q.getbyte(0)
  # added this extra loop since from some places we exit using throw :close
  # amd that was in a much higher place, and was getting us right out, with
  # no chance of user canceling quit. This extra loop allows us to remain
  # added on 2011-11-24 
  while true
    catch :close do
      while((ch = @window.getchar()) != 999 )
        if ch == @break_key || ch == @quit_key
          break
        end


        # 2014-08-19 - 22:51 commented next line, too much choice. keep it simple. delete in a month FIXME
        #yield ch if block # <<<----

        # this is what the user should have control ove. earlier we would put this in
        # a try catch block so user could do what he wanted with the error. Now we
        # need to get it to him somehow, perhaps through a block or on_error event
        begin
          # execute a code block so caller program can handle keys from a hash or whatever.
          # NOTE: these keys will not appear in help
          # FIXME : ideally if its just a hash, we should allow user to give it to form
          #  or widget which it will use, or merge, and be able to print help from
          if @keyblock
            str = keycode_tos ch
            # why did we ever want to convert to a symbol. why not just pass it as is.
            #@keyblock.call(str.gsub(/-/, "_").to_sym) # not used ever
            ret = @keyblock.call(str) 
            if ret
              @form.repaint 
              next
            end
          end
          @form.handle_key ch
        rescue => err
          $log.debug( "app.rb handle_key rescue reached ")
          $log.debug( err.to_s) 
          $log.debug(err.backtrace.join("\n")) 
          textdialog [err.to_s, *err.backtrace], :title => "Exception"
        end
        @window.wrefresh
      end
    end # catch
    stopping = @window.fire_close_handler
    @window.wrefresh
    break if stopping.nil? || stopping
  end # while
end