PyGobject（十五）布局容器之Button篇——Gtk.ScaleButton

Gtk.ScaleButton

继承关系

Gtk.ScaleButton根据滑块位置，显示不同的图片。Gtk.ScaleButton是Gtk.Button的直接子类

Methods

方法修饰词	方法名及参数
static	new (size, min, max, step, icons)
	get_adjustment ()
	get_minus_button ()
	get_plus_button ()
	get_popup ()
	get_value ()
	set_adjustment (adjustment)
	set_icons (icons)
	set_value (value)

Virtual Methods

do_value_changed (value)

Properties

Name	Type	Flags	Short Description
adjustment	Gtk.Adjustment	r/w	ScaleButton值的范围
icons	[str]	r/w	List of icon names
size	Gtk.IconSize	r/w/en	The icon size
value	float	r/w/en	The value of the scale

Signals

Name	Short Description
popdown	The ::popdown signal is a keybinding signal which gets emitted to popdown the scale widget.
popup	The ::popup signal is a keybinding signal which gets emitted to popup the scale widget.
value-changed	The ::value-changed signal is emitted when the value field has changed.

例子

代码：

#!/usr/bin/env python3
# Created by xiaosanyu at 16/6/27
# section 016
TITLE = "ScaleButton"
DESCRIPTION = """
Gtk.ScaleButton provides a button which pops up a scale widget.
This kind of widget is commonly used for volume controls in multimedia applications,
and GTK+ provides a Gtk.VolumeButton subclass that is tailored for this use case.
"""
import gi

gi.require_version('Gtk', '3.0')
from gi.repository import Gtk

# 最高的图标要放在第二位
icons = ["microphone-sensitivity-muted-symbolic.symbolic", "microphone-sensitivity-high-symbolic.symbolic",
         "microphone-sensitivity-low-symbolic.symbolic", "microphone-sensitivity-medium-symbolic.symbolic"]


class ScaleButtonWindow(Gtk.Window):
    def __init__(self):
        Gtk.Window.__init__(self, title="ScaleButton Demo")
        self.set_border_width(10)
        self.set_default_size(200, 300)
        box = Gtk.Box()
        sbtn = Gtk.ScaleButton(icons=icons)
        sbtn.connect("value_changed", self.change)
        box.add(sbtn)
        self.add(box)

    def change(self, btn, value):
        # print(value)
        pass


def main():
    win = ScaleButtonWindow()
    win.connect("delete-event", Gtk.main_quit)
    win.show_all()
    Gtk.main()


if __name__ == "__main__":
    main()

分析主要代码
定义显示的图片名称列表，默认显示的放在第一个，最后显示的图片放第二个，其余依次排放

icons = 
["microphone-sensitivity-muted-symbolic.symbolic", 
"microphone-sensitivity-high-symbolic.symbolic",
"microphone-sensitivity-low-symbolic.symbolic", "microphone-sensitivity-medium-symbolic.symbolic"]

定义一个ScaleButton，指定其icons属性

sbtn = Gtk.ScaleButton(icons=icons)

绑定”value_changed”信号

sbtn.connect("value_changed", self.change)

代码下载地址：http://download.youkuaiyun.com/detail/a87b01c14/9594728