如何更改GTK窗口小部件的属性，如堆栈？ [英] How do I change the property of a GTK widget such as a stack?

问题描述

我一直在快速浏览GtkStack的GTK 3.10文档。
$ b

• https://developer.gnome.org/gtk3/3.10/GtkStack.html

它提到添加到GtkStack的孩子获得了一个属性icon-name。

我的问题是 - 如何更改此属性的值。原因 - 我想将GtkStackSwitcher按钮更改为图标而不是文本，但我想对此编码 - 不使用GktBuilder用户界面。

如果您查看 gtk3-demo - 堆栈演示和UI文件，您可以看到GtkSwitcher有一个图标。

https://i.stack.imgur.com/6eJLa.pngalt =在这里输入图片描述>

  <？xml version =1.0encoding =UTF-8？> 
< interface> 
 <！ -  interface-requires gtk + 3.6  - >> 
< object class =GtkWindowid =window1> 
< property name =can_focus> False< / property> 
< property name =titletranslatable =yes> GtkStack< / property> 
< child> 
< object class =GtkGridid =grid1> 
< property name =visible> True< / property> 
< property name =can_focus> False< / property> 
< child> 
< object class =GtkStackSwitcherid =switcher> 
< property name =visible> True< / property> 
< property name =stack> stack< / property> 
< property name =halign>中心< / property> 
< / object> 
<包装> 
< property name =left_attach> 0< / property> 
< property name =top_attach> 0< / property> 
< property name =width> 1< / property> 
< property name =height> 1< / property> 
< / packing> 
< / child> 
< child> 
< object class =GtkStackid =stack> 
< property name =visible> True< / property> 
< property name =can_focus> True< / property> 
< property name =transition-type>交叉淡入淡出< / property> 
< child> 
< object class =GtkImageid =image1> 
< property name =visible> True< / property> 
< property name =can_focus> False< / property> 
< property name =margin-top> 20< / property> 
< property name =margin-bottom> 20< / property> 
< property name =resource> /application/gtk-logo-48.png< / property> 
< / object> 
<包装> 
< property name =name> page1< / property> 
 < / packing> 
< / child> 
< child> 
< object class =GtkCheckButtonid =checkbutton1> 
< property name =labeltranslatable =yes> Page 2< / property> 
< property name =visible> True< / property> 
< property name =can_focus> True< / property> 
< property name =receiving_default> False< / property> 
< property name =xalign> 0< / property> 
< property name =draw_indicator> True< / property> 
< property name =halign>中心< / property> 
< property name =valign>中心< / property> 
< / object> 
<包装> 
< property name =name> page2< / property> 
 < / packing> 
< / child> 
< child> 
< object class =GtkSpinnerid =spinner1> 
< property name =visible> True< / property> 
< property name =can_focus> False< / property> 
< property name =halign>中心< / property> 
< property name =valign>中心< / property> 
< property name =active> True< / property> 
< / object> 
<包装> 
< property name =name> page3< / property> 
< property name =icon-name> face-laugh-symbolic< / property> 
< / packing> 
< / child> 
< / object> 
<包装> 
< property name =left_attach> 0< / property> 
< property name =top_attach> 1< / property> 
< property name =width> 1< / property> 
< property name =height> 1< / property> 
< / packing> 
< / child> 
< / object> 
< / child> 
< / object> 
< / interface> 
  

在Ubuntu 14.04（Gtk 3.10）下使用python3解释器

  Python 3.4.0（默认，2014年4月11日，13:05:11）
 [GCC 4.8.2]在linux 
上输入help ，版权，信用或许可证以获取更多信息。 
>>> from gi.repository import Gtk 
>>> stack = Gtk.Stack（）
>>> spin = Gtk.Spinner（）
>>> stack.add_named（旋转，旋转）
>>> stack.show_all（）
>>> child = stack.get_visible_child（）
>>> child.props.icon_name =go-previous
 Traceback（最近一次调用的最后一个）：
在< module>中的第1行文件< stdin> 
 AttributeError：'gi._gobject.GProps'对象没有属性'icon_name'
>>> stack.props.icon_name =go-previous
 Traceback（最近一次调用最后一次）：
在< module>中，第1行的文件< stdin> 
 AttributeError：'gi._gobject.GProps'对象没有属性'icon_name'
>>> 
  

正如你所看到的 - 我已经添加了一个GtkSpinner到一个堆栈对象 - 我尝试过访问已添加的孩子，然后更改icon-name属性。

没有快乐。那么我所做的明显的错误是什么？

解决方案

轻微但重要的区别：名称不是 GtkStack 子元素的属性，它是 GtkStack 。

不同之处在于，子属性影响容器与子容器之间的关系，而不仅仅是容器或

使用这个：

  stack.child_set_property （孩子，'icon-name'，'go-previous'）
  

I've been taking a quick look at the GTK 3.10 documentation for a GtkStack.

• https://developer.gnome.org/gtk3/3.10/GtkStack.html

It mentions that the child added to a GtkStack is given a property "icon-name".

My question is - how can I change the value of this property. The reason - I want to change the GtkStackSwitcher button to be an icon not text but I want to code this - not use a GktBuilder UI.

If you look at the gtk3-demo - Stack demo and the UI file you can see the GtkSwitcher has an icon.

<?xml version="1.0" encoding="UTF-8"?>
<interface>
  <!-- interface-requires gtk+ 3.6 -->
  <object class="GtkWindow" id="window1">
    <property name="can_focus">False</property>
    <property name="title" translatable="yes">GtkStack</property>
    <child>
      <object class="GtkGrid" id="grid1">
        <property name="visible">True</property>
        <property name="can_focus">False</property>
        <child>
          <object class="GtkStackSwitcher" id="switcher">
            <property name="visible">True</property>
            <property name="stack">stack</property>
            <property name="halign">center</property>
          </object>
          <packing>
            <property name="left_attach">0</property>
            <property name="top_attach">0</property>
            <property name="width">1</property>
            <property name="height">1</property>
          </packing>
        </child>
        <child>
          <object class="GtkStack" id="stack">
            <property name="visible">True</property>
            <property name="can_focus">True</property>
            <property name="transition-type">crossfade</property>
            <child>
              <object class="GtkImage" id="image1">
                <property name="visible">True</property>
                <property name="can_focus">False</property>
                <property name="margin-top">20</property>
                <property name="margin-bottom">20</property>
                <property name="resource">/application/gtk-logo-48.png</property>
              </object>
              <packing>
                <property name="name">page1</property>
                <property name="title" translatable="yes">Page 1</property>
              </packing>
            </child>
            <child>
              <object class="GtkCheckButton" id="checkbutton1">
                <property name="label" translatable="yes">Page 2</property>
                <property name="visible">True</property>
                <property name="can_focus">True</property>
                <property name="receives_default">False</property>
                <property name="xalign">0</property>
                <property name="draw_indicator">True</property>
                <property name="halign">center</property>
                <property name="valign">center</property>
              </object>
              <packing>
                <property name="name">page2</property>
                <property name="title" translatable="yes">Page 2</property>
              </packing>
            </child>
            <child>
              <object class="GtkSpinner" id="spinner1">
                <property name="visible">True</property>
                <property name="can_focus">False</property>
                <property name="halign">center</property>
                <property name="valign">center</property>
                <property name="active">True</property>
              </object>
              <packing>
                <property name="name">page3</property>
                <property name="icon-name">face-laugh-symbolic</property>
              </packing>
            </child>
          </object>
          <packing>
            <property name="left_attach">0</property>
            <property name="top_attach">1</property>
            <property name="width">1</property>
            <property name="height">1</property>
          </packing>
        </child>
      </object>
    </child>
  </object>
</interface>

Using the python3 interpreter under Ubuntu 14.04 (Gtk 3.10)

Python 3.4.0 (default, Apr 11 2014, 13:05:11) 
[GCC 4.8.2] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> from gi.repository import Gtk
>>> stack = Gtk.Stack()
>>> spin = Gtk.Spinner()
>>> stack.add_named(spin, "spin")
>>> stack.show_all()
>>> child = stack.get_visible_child()
>>> child.props.icon_name = "go-previous"
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
AttributeError: 'gi._gobject.GProps' object has no attribute 'icon_name'
>>> stack.props.icon_name = "go-previous"
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
AttributeError: 'gi._gobject.GProps' object has no attribute 'icon_name'
>>> 

As you can see - I've added a GtkSpinner to a stack object - and I've attempted to access the child that was added and then change the property "icon-name".

No joy. So what is the obvious mistake I'm making?

解决方案

Slight but important distinction: the icon-name isn't a "property" of the child of a GtkStack, it's a "child property" of GtkStack.

The difference is that a "child property" affects the relation between a container and one of its child widgets, rather than just the container or just the child widget.

Use this:

stack.child_set_property(child, 'icon-name', 'go-previous')

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