PyGobject（十四）布局容器之Button篇——Gtk.LockButton-优快云博客

本文链接：https://blog.youkuaiyun.com/a87b01c14/article/details/52036217

GtkLockButton

Gtk.LockButton

继承关系

Gtk.LockButton锁定与解锁按钮，常用来进行权限管理。Gtk.LockButton是Gtk.Button的直接子类
这里写图片描述

Methods

方法修饰词	方法名及参数
static	new (permission)
	get_permission ()
	set_permission (permission)

Virtual Methods

Properties

Name	Type	Flags	Short Description
permission	Gio.Permission	r/w	The Gio.Permission object controlling this button
text-lock	str	r/w/c	锁定状态显示的文本
text-unlock	str	r/w/c	解锁状态显示的文本
tooltip-lock	str	r/w/c	提示用户锁定时显示的文本
tooltip-not-authorized	str	r/w/c	提示用户不能获得授权时显示的文本
tooltip-unlock	str	r/w/c	提示用户解锁时显示的文本

Signals

Name	Short Description

例子

这里写图片描述

代码：

#!/usr/bin/env python3
# Created by xiaosanyu at 16/6/27
# section 015
TITLE = "LockButton"
DESCRIPTION = """
Gtk.LockButton is a widget that can be used in control panels or preference dialogs
to allow users to obtain and revoke authorizations needed to operate the controls.
The required authorization is represented by a Gio.Permission object.
Concrete implementations of Gio.Permission may use PolicyKit or some other authorization framework.
To obtain a PolicyKit-based Gio.Permission, use polkit_permission_new().
"""
import gi

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


class LockButtonWindow(Gtk.Window):
    def __init__(self):
        Gtk.Window.__init__(self, title="LockButton Demo")
        self.set_border_width(10)
        parent = Gtk.HBox(spacing=6)
        self.box = Gtk.HBox(spacing=6, homogeneous=False)
        self.check_button = Gtk.CheckButton("check button")
        self.box.pack_start(self.check_button, False, False, 0)
        self.box.pack_start(Gtk.Button("button"), False, False, 0)
        circular_button = Gtk.Button.new_from_icon_name("emblem-system-symbolic", Gtk.IconSize.MENU)
        circular_button.get_style_context().add_class("circular")
        self.box.pack_start(circular_button, False, False, 0)

        lbtn = Gtk.LockButton()
        lbtn.connect("clicked", self.on_clicked)
        permission = Gio.SimplePermission.new(allowed=True)
        permission.impl_update(True, True, True)
        permission.bind_property("allowed", self.box, "sensitive", GObject.BindingFlags.SYNC_CREATE)

        lbtn.set_permission(permission)

        parent.pack_start(self.box, False, False, 0)
        parent.pack_start(lbtn, False, False, 0)
        self.add(parent)

    def on_clicked(self, button):
        if button.get_permission().get_allowed():
            self.box.props.sensitive = False
            button.get_permission().impl_update(False, True, True)
        else:
            self.box.props.sensitive = True
            button.get_permission().impl_update(True, True, True)


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


if __name__ == "__main__":
    main()

分析主要代码
创建一个LockButton，绑定”clicked”事件

lbtn = Gtk.LockButton()
lbtn.connect("clicked", self.on_clicked)

创建Gio.SimplePermission对象，将permission的“allowed”属性与self.box的“sensitive”属性绑定

permission = Gio.SimplePermission.new(allowed=True)
permission.impl_update(True, True, True)
permission.bind_property("allowed", self.check_button, "sensitive", GObject.BindingFlags.SYNC_CREATE)

impl_update(allowed, can_acquire, can_release)[source]
    Parameters:
        allowed (bool) – ‘allowed’ property
    can_acquire (bool) – the new value for the ‘can-acquire’ property
    can_release (bool) – the new value for the ‘can-release’ property

设置LockButton的权限控制对象

lbtn.set_permission(permission)

/(ㄒoㄒ)/~~
无赖，我执行此代码一直显示
”Error releasing permission: Can’t acquire or release permission”

只好在点击事件中做文章

def on_clicked(self, button):
    if button.get_permission().get_allowed():
        self.box.props.sensitive = False
        button.get_permission().impl_update(False, True, True)
    else:
        self.box.props.sensitive = True
        button.get_permission().impl_update(True, True, True)