Shoes 中实例变量的奇怪行为
嘿,全部。我正在使用 Shoes 为 Ruby 项目制作 GUI。
我有一个名为 Manager 的类(如内存管理器中的那样),它从文件加载“进程列表”,将其拆分,并在进行某个执行调用时将内容分配给内存中的不同“页面”。不过,我真的认为这部分不太重要。它作为终端应用程序运行得很好。
然而,鞋子让我感到困惑。这是我到目前为止所得到的:
Shoes.app(:title => "Paging Simulator", :width => 800, :height => 450) do
@manager = Manager.new
stack(:width => 200) do
@exec_list = stack {
title "Execution Queue", :size => 14
@exec_lines = para "click button to load", :size => 9
@file_button = button "Load Process List"
@file_button.click {
filename = ask_open_file
# @manager.set_exec_list filename
# alert "this makes no sense"
@exec_lines.text = @manager.exec_list.join "\n"
# exec_lines.text = File.read filename
}
}
end
end
当我运行此命令时会发生什么:
程序视图按预期加载。我得到一个标题、一个写着“单击按钮...”的段落和一个按钮。我单击按钮并选择文件。但这就是事情变得奇怪的地方。
如果我运行最后一个注释行 exec_lines.text = File.read filename
它会按照我的意愿运行,但我的经理没有获得它需要的任何信息。
如果我运行 @manager.set_exec_list filename
行,则该块中该行的任何内容都不会运行,包括 alert
或任何其他我尝试将代码放在那里。
但是,如果我如上所示运行,我会得到预期的输出,但无法从我选择的文件中设置数据。
我试图从 鞋子规则 页面弄清楚这一点,但这似乎并不是他们解决的一个问题,他们的“它改变/不改变自我”我想我明白了,但这很令人困惑,我不认为它与这个问题完全相关。
有谁知道如何让它发挥作用吗?我在这个项目上处于紧要关头,而且我似乎无法运行任何其他 Ruby GUI 工具包,所以我认为我对 Shoes 非常着迷。
谢谢。
更新 当我调用 @manager.set_exec_list filename
时,我尝试在代码上运行 ruby-debug,单步执行它表明已进行此调用,但代码实际上从未(根据我的内容)可以告诉)跳转到该方法,并且就像块中的最后一行代码一样。我是否需要将这些类包含在 Shoes.app
块中? 更新 不。这没什么不同。
更新完整源代码如下:
#!/usr/bin/env shoes
require 'rubygems'
require 'ruby-debug'
class MemSegment
attr_accessor :filled, :pid, :seg, :seg_id
def initialize(filled=false, pid=nil, seg=nil, seg_id=0)
@filled = filled
@pid = pid.to_i
@seg = seg.to_s
@seg_id = seg_id.to_i
self
end
def fill(pid, seg, seg_id)
@filled = true; @pid = pid; @seg = seg; @seg_id = seg_id;
self
end
def clear
self.filled = false; self.pid = nil; self.seg = nil;
self
end
def filled?
@filled
end
def to_s
filled? ? "#{seg} #{seg_id} for pid #{pid}" : "Free"
end
end
class SimProc
include Enumerable
attr_accessor :pid, :code, :data
def initialize(pid, code, data)
@pid = pid.to_i
@code = code.to_i
@data = data.to_i
end
def each
yield :code, code
yield :data, data
end
def to_s
"[SimProc :pid => #{pid}, :code => #{code}, :data => #{data}]"
end
def to_a
[@pid, @code, @data]
end
end
class Manager
attr_reader :segments, :processes, :exec_list, :exec_object
def initialize
@exec_list = [[1, 2], [3, 4], [5, 6]]
@processes = {}
@segments = Array.new(8) { MemSegment.new }
end
def print_activity
@segments.each_with_index {|s, index| puts "Seg #{index} => #{s}" }
@processes.each_value {|s| puts s }
end
def load_process(pcb, exec_index)
if pcb.size == 3
p = SimProc.new(*pcb)
bad_load = false
@processes.store p.pid, p
@processes[p.pid].each do |proc_seg, bsize|
(bsize / 512.0).ceil.times do |seg_id|
@segments.each_with_index do |s, index|
if !s.filled
#find the first empty memory segment
s.fill p.pid, proc_seg, seg_id
break
# if all slots are filled and we couldn't place a proc block
elsif index == @segments.size - 1
bad_load = true
puts "Cannot find a place for #{proc_seg} segment of size #{bsize}. Requeueing..."
break;
end
end
break if bad_load
end
end
# recover pages and queue the process for later
if bad_load
@segments.each_with_index do |seg, seg_index|
# clear any segments that didn't get loaded properly
if seg.pid == p.pid
seg.clear
puts "Seg #{seg_index} => segment cleared: #{seg}"
end
end
# reinsert this process after the next in the execution list
# it will attempt to load and run after the next process is performed
@exec_list.insert(exec_index + 2, p.to_a)
end
print_activity
elsif pcb.size == 2 and pcb[1] == -1
# a process is exiting
puts "removing pid #{pcb[0]}"
@segments.each { |s| s.clear if s.pid == pcb[0] }
@processes.delete pcb[0]
print_activity
end
end
def set_exec_list(filename)
file = File.open filename
file.each { |pcb| @exec_list << pcb.split.map(&:to_i) } unless file.nil?
filename
end
def main
exseq = File.open('exseq2.txt')
set_exec_list exseq
# this is the object that will be used to run each process with .next
@exec_object = @exec_list.each_with_index
# @exec_list.each_with_index { |pcb, exec_index| load_process(pcb, exec_index) }
(@exec_list.size + 1).times do
load_process(*@exec_object.next)
end
end
end
=begin
manager = Manager.new
manager.main
=end
#=begin
Shoes.app(:title => "Paging Simulator", :width => 800, :height => 450) do
@manager = Manager.new
stack(:width => 200) do
@exec_list = stack {
title "Execution Queue", :size => 14
@exec_lines = para "click button to load", :size => 9
@file_button = button "Load Process List"
debugger
@file_button.click {
filename = ask_open_file
@manager.set_exec_list filename
# alert "this makes no sense"
# @exec_lines.text = @manager.exec_list
# @exec_lines.text = File.read filename
@exec_lines.text = @manager.exec_list.join "\n"
}
}
end
end
#=end
Hey, all. I'm working on making a GUI for a Ruby project using Shoes.
I've got a class called Manager (as in memory manager) that loads a 'process list' from a file, splits it up and assigns things to different 'pages' in memory when a certain execution call is made. I really don't think this part matters too much, though. It all works as a terminal application just fine.
However, Shoes is just baffling me. Here's what I've got so far:
Shoes.app(:title => "Paging Simulator", :width => 800, :height => 450) do
@manager = Manager.new
stack(:width => 200) do
@exec_list = stack {
title "Execution Queue", :size => 14
@exec_lines = para "click button to load", :size => 9
@file_button = button "Load Process List"
@file_button.click {
filename = ask_open_file
# @manager.set_exec_list filename
# alert "this makes no sense"
@exec_lines.text = @manager.exec_list.join "\n"
# exec_lines.text = File.read filename
}
}
end
end
What happens when I run this:
The program view loads as expected. I get a header, a paragraph that says "click button....", and a button. I click the button and I select the file. But this is where things get weird.
If I run the last commented line exec_lines.text = File.read filename
it does as I would like, but my manager doesn't get any of the information it needs.
If I run the @manager.set_exec_list filename
line, nothing from that line on in the block gets run, including the alert
, or any other code I try to put in there.
if I run as shown above, however, I get the output I expect, but I don't get to set my data from the file that I select.
I've tried to figure this out from the Shoes Rules page, but this doesn't seem to be an issue that they address, and their "it changes/doesn't change self" I think I grasp, but it's confusing and I don't think it's exactly related to this problem.
Does anyone have any idea how to get this to work? I'm kind of down to crunch time on this project and I can't seem to get any other Ruby GUI toolkit to even run, so I think I'm pretty stuck with Shoes.
Thanks.
Update
I've tried running ruby-debug on the code when I make the call to @manager.set_exec_list filename
, and stepping through it shows that this call is made, but the code never actually (from what I can tell) jumps into that method, and acts like it's the last line of code in the block. Do I need to include these classes inside the Shoes.app
block?
Update Nope. That does nothing different.
update fullsource code follows:
#!/usr/bin/env shoes
require 'rubygems'
require 'ruby-debug'
class MemSegment
attr_accessor :filled, :pid, :seg, :seg_id
def initialize(filled=false, pid=nil, seg=nil, seg_id=0)
@filled = filled
@pid = pid.to_i
@seg = seg.to_s
@seg_id = seg_id.to_i
self
end
def fill(pid, seg, seg_id)
@filled = true; @pid = pid; @seg = seg; @seg_id = seg_id;
self
end
def clear
self.filled = false; self.pid = nil; self.seg = nil;
self
end
def filled?
@filled
end
def to_s
filled? ? "#{seg} #{seg_id} for pid #{pid}" : "Free"
end
end
class SimProc
include Enumerable
attr_accessor :pid, :code, :data
def initialize(pid, code, data)
@pid = pid.to_i
@code = code.to_i
@data = data.to_i
end
def each
yield :code, code
yield :data, data
end
def to_s
"[SimProc :pid => #{pid}, :code => #{code}, :data => #{data}]"
end
def to_a
[@pid, @code, @data]
end
end
class Manager
attr_reader :segments, :processes, :exec_list, :exec_object
def initialize
@exec_list = [[1, 2], [3, 4], [5, 6]]
@processes = {}
@segments = Array.new(8) { MemSegment.new }
end
def print_activity
@segments.each_with_index {|s, index| puts "Seg #{index} => #{s}" }
@processes.each_value {|s| puts s }
end
def load_process(pcb, exec_index)
if pcb.size == 3
p = SimProc.new(*pcb)
bad_load = false
@processes.store p.pid, p
@processes[p.pid].each do |proc_seg, bsize|
(bsize / 512.0).ceil.times do |seg_id|
@segments.each_with_index do |s, index|
if !s.filled
#find the first empty memory segment
s.fill p.pid, proc_seg, seg_id
break
# if all slots are filled and we couldn't place a proc block
elsif index == @segments.size - 1
bad_load = true
puts "Cannot find a place for #{proc_seg} segment of size #{bsize}. Requeueing..."
break;
end
end
break if bad_load
end
end
# recover pages and queue the process for later
if bad_load
@segments.each_with_index do |seg, seg_index|
# clear any segments that didn't get loaded properly
if seg.pid == p.pid
seg.clear
puts "Seg #{seg_index} => segment cleared: #{seg}"
end
end
# reinsert this process after the next in the execution list
# it will attempt to load and run after the next process is performed
@exec_list.insert(exec_index + 2, p.to_a)
end
print_activity
elsif pcb.size == 2 and pcb[1] == -1
# a process is exiting
puts "removing pid #{pcb[0]}"
@segments.each { |s| s.clear if s.pid == pcb[0] }
@processes.delete pcb[0]
print_activity
end
end
def set_exec_list(filename)
file = File.open filename
file.each { |pcb| @exec_list << pcb.split.map(&:to_i) } unless file.nil?
filename
end
def main
exseq = File.open('exseq2.txt')
set_exec_list exseq
# this is the object that will be used to run each process with .next
@exec_object = @exec_list.each_with_index
# @exec_list.each_with_index { |pcb, exec_index| load_process(pcb, exec_index) }
(@exec_list.size + 1).times do
load_process(*@exec_object.next)
end
end
end
=begin
manager = Manager.new
manager.main
=end
#=begin
Shoes.app(:title => "Paging Simulator", :width => 800, :height => 450) do
@manager = Manager.new
stack(:width => 200) do
@exec_list = stack {
title "Execution Queue", :size => 14
@exec_lines = para "click button to load", :size => 9
@file_button = button "Load Process List"
debugger
@file_button.click {
filename = ask_open_file
@manager.set_exec_list filename
# alert "this makes no sense"
# @exec_lines.text = @manager.exec_list
# @exec_lines.text = File.read filename
@exec_lines.text = @manager.exec_list.join "\n"
}
}
end
end
#=end
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所以,有几件事:
#1,我没有
Manager
的实现,所以我无法告诉你它为什么会崩溃。您是否尝试检查 Shoes 控制台是否有任何错误?点击 control-/ 将其调出。如果“到达该线后没有任何运行”,那么这可能就是问题所在。#2,这对我来说确实有效,只要您将最后一行的
exec_lines
更改为@exec_lines
即可。这是我尝试过的:希望有帮助!
So, a few things:
#1, I don't have the implementation of
Manager
, so I can't tell you why it breaks. Did you try checking the Shoes console for any errors? Hit control-/ to bring that up. If 'nothing runs after it hits that line,' that's probably the issue.#2, this does work for me, as long as you change
exec_lines
to@exec_lines
on the last line. Here's what I tried:Hope that helps!