如何在GTK和Python中获取小部件的背景色? [英] How to get the background color of a widget in GTK and Python?

问题描述

我想获得小部件的正常背景色(在本例中为GtkHeaderBar).我目前正在使用

I want to get the normal background color of a widget (a GtkHeaderBar, in this case). I'm currently using

style = self.get_titlebar().get_style_context()

获取样式，然后

color = style.get_property("background-color", Gtk.StateFlags.NORMAL)

获取与该样式相关的背景颜色.

to get the background color associated to that style.

但是它返回具有以下属性的Gkd.RGBA对象:

However it returns a Gkd.RGBA object with the following properties:

Gdk.RGBA(red=0.000000, green=0.000000, blue=0.000000, alpha=0.000000)

但是，如果我打开GTK Inspector，选择HeaderBar，然后转到样式属性，它将显示

But if I open GTK Inspector, select the HeaderBar, and goes to the style properties, it shows

background-color | rgb(57,63,63) | gtk-contained-dark.css:1568.29

我该怎么做才能获得这些相同的值?

What do I have to do to get these same values?

我正在尝试GtkStyleContext.render_background()，但没有成功:

I am experimenting with the GtkStyleContext.render_background(), but I'm having no success:

surfc = Cairo.ImageSurface (Cairo.FORMAT_ARGB32, 10, 10)
contx = Cairo.Context(surfc)
style = self.get_titlebar().get_style_context()
backg = Gtk.render_background(style, contx, 10, 10, 10, 10)
surfc.write_to_png("test.png")

生成的文件test.png是rgba(0, 0, 0, 0)图像.

推荐答案

您应该看看如何使用CSS修改背景颜色.它有一个非常好的文档.可以和python一起使用

You should have a look at modifying the background-color with css. There is a very good documentation of it. It can be used with python with

css_provider = Gtk.CssProvider()
css_provider.load_from_path('application.css')
Gtk.StyleContext.add_provider_for_screen(
    Gdk.Screen.get_default(),
    css_provider,
    Gtk.STYLE_PROVIDER_PRIORITY_APPLICATION
)

和一个css文件，例如:

and a css file like:

GtkHeaderbar {
    background-color:@theme_bg_color;
}

编辑:正如您评论的那样，您不想修改背景颜色，而是获取背景值.您可以执行widget.get_style_context().get_background_color()，它将返回类似Gdk.RGBA(red=0.913725, green=0.913725, blue=0.913725, alpha=1.000000)的内容.

As you commented you do not want to modify the background color but retrieve the value of it. You can do widget.get_style_context().get_background_color() and it will return something like Gdk.RGBA(red=0.913725, green=0.913725, blue=0.913725, alpha=1.000000).

但是，您应该注意，由于没有一个背景色，因此已弃用get_background_color().一些小部件使用渐变作为背景，因此使用此方法不是最佳解决方案.请参阅文档以供参考

However, you should note that get_background_color() is deprecated since there is not one background color. Some widget use a gradient as a background so it is not the best solution to use this method. See the documentation for reference.

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