尝试运行WxRuby时获取“Gtk:ERROR”

Question

我正在使用Ubuntu10.04，并且我正在尝试运行一个我从这个站点WxRubyWiki复制粘贴的WxRuby示例。我一直在网上寻找帮助，但我找不到任何类似的东西...

我得到了这个错误...

Gtk:ERROR:/build/buildd/gtk+2.0-2.20.1/gtk/gtkwindow.c:6789:IA__gtk_window_present_with_time: assertion failed: (widget->window != NULL)
Aborted

这些是我使用的版本..。

ruby -v
ruby 1.8.7 (2010-01-10 patchlevel 249) [i486-linux]
gem list
...
wxruby (2.0.1 x86-linux)
...

这是我要运行的代码..。

require 'rubygems' if RUBY_VERSION < '1.9'
require 'wx'

class EventFrame < Wx::Frame
    def initialize()
        super(nil, -1, "Event Frame")
        @idleCounter = 0
        evt_close {|event| on_close(event)}
        evt_idle {|event| on_idle(event)}
        evt_size {|event| on_size(event)}
        evt_key_down {|event| on_key(event)}
        evt_left_down {|event| on_left_down(event)}
        # You can still process these events, you just need to define a separate callback for middle_down and right_down
        # to process them as separate events
        evt_middle_down {|event| on_middle_down(event)}
        evt_right_down {|event| on_right_down(event)}

        button = Wx::Button.new(self, -1, "Push me")
        evt_button(button.get_id()) {|event| on_button(event)}

        show()
    end

    def message(text, title)
        m = Wx::MessageDialog.new(self, text, title, Wx::OK | Wx::ICON_INFORMATION)
        m.show_modal()
    end

    def on_close(event)
        message("This frame will be closed after you push ok", "Close event")
        #close(true) - Don't call this - it will call on_close again, and your application will be caught in an infinite loop
        # Either call event.skip() to allow the Frame to close, or call destroy(), as follows
        destroy()
    end

    def on_idle(event)
        @idleCounter += 1
        if @idleCounter > 15 # Without the counter to slow this down, Idle events would be firing every second
            message("The system is idle right now", "Idle event")
            @idleCounter = 0
        end
        event.request_more() # You must include this, otherwise the Idle event won't occur again
    end

    def on_size(event)
        size = event.get_size()
        x = size.x
        y = size.y
        message("X = " + x.to_s + ", Y = " + y.to_s, "Size event")
    end

    def on_key(event)
        message("Key pressed", "Key Event")
    end

    def on_left_down(event)
        button = ""
        if event.left_down()
            button = "Left"
        end
        message(button + " button was clicked", "Mouse event")
    end

    def on_middle_down(event)
        # This method hasn't been implemented yet...
        #if event.middle_down()
           #button = "Middle"
        #end
        message("Middle button was clicked", "Mouse event")
    end

    def on_right_down(event)
        # This method hasn't been implemented yet...
        #if event.right_down()
            #button = "Right"
        #end
        message("Right button was clicked", "Mouse event")
    end

    def on_button(event)
        message("Button was clicked", "Button event")
    end
end

class MyApp < Wx::App
    def on_init
        EventFrame.new()
    end
end

MyApp.new.main_loop

提前感谢！

Answer 1

这个问题已经修复并在ubuntu 11.10中运行:)

Answer 2

它更多的是理解GTK+2/wx/wxRuby是如何工作的。如上所述，上面的代码既不能在我设置用于测试的Virtual Box机器上运行，也不能在我的开发机的带有1000‘s内核编译选项和Ruby1.9.3 p21的Ubuntu11.10 x86_64上运行。

当在帧创建过程中激发on_size事件时，将发生GTK+2错误。创建尚未完成，因此消息框此时没有父级。可以通过注释掉(在def on_size(Event)中)来测试这一点：

message("X = " + x.to_s + ", Y = " + y.to_s, "Size event")

并尝试：

puts "Size event: X = #{x}, Y = #{y}"

查看标准输出上的事件详细信息。您将注意到在创建过程中触发了两个事件:初始大小事件和调整大小事件

另一个警告是空闲循环，它会锁定Unity o my system。您可以通过如下所示更改代码来测试idle事件是否在没有锁定的情况下发生：

在def initialize中，在show()之前添加以下内容：

create_status_bar(2)
self.status_text = "Welcome to wxRuby!"

然后在idle_event中：

def on_idle(event)
  @idleCounter += 1
  #if @idleCounter > 15 # Without the counter to slow this down, Idle events would be firing every second
  #    message("The system is idle right now", "Idle event")
  #    @idleCounter = 0
  #end
  set_status_text @idleCounter.to_s, 1
  event.request_more() # You must include this, otherwise the Idle event won't occur again
end

关于代码的最后一个警告是，您可能注意到没有看到创建消息框的按键或鼠标按下事件。这是因为按钮控件填充工作区并捕获关键点和按钮的帧事件。如果在应用程序运行时调整框架的大小，默认情况下按钮不会随之调整大小(GTK+2 platform)。如果您随后在frame客户端区内单击，但没有单击按钮，您将看到鼠标事件。

祝你好运！