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LGPL-2.1
此文档主要介绍任务栏的接口和主要功能实现逻辑。

任务栏介绍

任务栏采用插件加载机制,主要包含startbar(开始菜单),taskbar(窗口切换区),statusnotifier(托盘区),calendar(日历),showdesktop(显示桌面)这6个插件,下面依次介绍每个插件的功能:

  • startbar 此插件包含开始菜单按钮和显示任务视图按钮,当这两个按钮被左键点击时,任务栏会调用并执行开始菜单或多任务视图所对应的二进制文件,实现相应的功能。 在开始菜单按钮上右键可以看到任务栏提供的一些操作(1)用户操作,包括锁屏和注销;(2)休眠或睡眠,依据机器是否支持休眠操作决定休眠选项是否可选;(3)电源,包括重启,定时关机和关机操作。 显示任务视图按钮是否展示对应任务栏空白处右键菜单的“显示任务视图按钮”项是否勾选
  • taskbar 此区域主要用来展示用户固定到任务栏的应用,以及所有已经打开的应用的图标,通过图标的点击可实现窗口切换。taskbar提供的接口主要有: (1)将应用固定到任务栏:此接口主要提供给开始菜单和搜索将应用固定到任务栏使用,它们向任务栏; (2)从任务栏取消固定:此接口主要提供给开始菜单和搜索将应用固定到任务栏使用; (3)应用分组显示接口:此接口主要实现让同一应用的图标显示在一起,每个应用都有一个组名,组名相同的则将图标放在一起显示,此接口主要由panel-daemon后台服务进程供,当有新窗口打开时,首先检测是否存在已经打开的此应用,如有则作为一组图标显示,若没有则在任务栏增加新的按钮。
  • statusnotifier 托盘区的功能是为应用创建一个快捷操作按钮,可以执行相关操作或显示应用状态。应用可通过SNI协议将图标注册到托盘区域。
  • calendar 日历插件主要用于显示日历界面和时间,左键单击可以调出日历界面,右键单击可进入控制面板的时间和日期的设置界面。
  • showdesktop 显示桌面按钮的功能是在当前窗口和桌面之间进行切换。

任务栏的主要功能

  • 调整位置和调整大小 任务栏有上下左右四个位置可供选择,每个位置有大中小三个尺寸,可通过右键点击任务栏空白处调出右键菜单进行调节,也可通过gsettings命令进行调节。 获取任务栏当前位置命令:gsettings get org.ukui.panel.settings panelposition ,其中0代表下,1代表上,2代表左,3代表右。 调整位置命令:gsettings set org.ukui.panel.settings panelposition 1,表示将任务栏设置为上方。 获取任务栏当前大小命名:gsettings get org.ukui.panel.settings panelsize,返回值为任务栏的高度像素值,小尺寸为46,中尺寸为70,大尺寸为92。 调整大小命令:gsettings set org.ukui.panel.settings panelsize 92,表示将任务栏设置为大尺寸,设置的数值可以为任意值

  • 隐藏任务栏 点击任务栏右键菜单中的隐藏任务栏选项,任务栏进入隐藏状态,留有四像素边距,鼠标进入此边距时可以唤醒任务栏,鼠标离开后又会进入隐藏状态。此状态存储于任务栏配置文件中的hidable中。

  • 锁定任务栏 点击任务栏右键菜单中的锁定任务栏选项后,任务栏将不能被修改位置和大小,不能设置隐藏。此状态存储于任务栏配置文件中的lockPanel中。

配置文件与用户设置

  • 配置文件作用 根目录任务栏配置文件地址:/usr/share/ukui/panel.conf 用户目录任务栏配置文件地址:~/.config/ukui/panel.conf 它们的作用分别是: (1)根目录下的配置文件决定了任务栏需要加载哪些插件,即/usr/share/ukui/panel.conf文件中 [panel1] 字段的plugins的值; (2)用户目录下的配置文件保存了用户的设置,包括任务栏固定了哪些应用图标,任务栏的位置和大小,隐藏和显示,以及托盘区哪些应用显示在收纳栏里的设置; (3)每次安装任务栏的包或者是进行任务栏升级,更新的只有根目录下的配置文件,而不会修改用户目录下的配置文件,避免了装包或升级导致的用户配置消失的问题。
  • 配置文件内容 [panel1] alignment=-1 【任务栏位置居左,0代表居中,1代表居右】 animation-duration=100 【隐藏任务栏的动画时间为100ms】 desktop=0 【任务栏位于0桌面】 hidable=false 【任务栏是否隐藏,false代表不隐藏,true代表隐藏】 lineCount=1 【任务栏单行显示】 lockPanel=false 【任务栏是否锁定,false代表不锁定,true代表锁定】 plugins=startbar,taskbar,statusnotifier,calendar, showdesktop 【任务栏所需要加载的插件,注:此字段从根目录下的配置文件中读取】 position=Bottom 【任务栏的位置,Bottom代表下,Top代表上,Left代表左, Right代表右】 reserve-space=true show-delay=0 【延迟显示的时间】 visible-margin=true width=100 【任务栏的长度,数值代表的是占屏幕长度的百分比】 width-percent=true 【任务栏长度是否以百分比的形式显示】 其余字段为各个插件的显示位置和内容,如:3.1以上版本的任务栏的[taskbar]字段包含了固定在任务栏的应用有哪些,默认的是文件管理器,奇安信浏览器,WPS和软件商店 [statusnotifier]字段包含了托盘应用哪些放在收纳栏里面(hideApp),哪些放在收纳栏外边(showApp)。

编译

在编译任务栏代码前需要安装debian/control文件中写到的编译依赖,安装完所有依赖后,新建一个build文件夹,在build目录下执行cmake .. && make -j12 && sudo make install进行编译,编译通过后执行./panel/ukui-panel运行。

调试

任务栏采用了ukui-log4qt模块的日志功能,输出的日志在用户目录下的.log文件夹内的ukui-panel.log中,如需调试可在终端输入tail -f ukui-panel.log命令,可实时查看任务栏的日志输出

运行

任务栏的进程共有4个: ukui-panel 任务栏的GUI界面 panel-daemon 任务栏后台进程,负责监听任务栏添加和删除应用,以及应用的分组显示 sni-daemon SNI协议后台进程,负责托盘区图标的注册 sni-xembed-proxy 将使用X协议注册的托盘图标转换成SNI协议 任务栏的进程均为开机自启动进程

任务栏提供的DBUS接口

  • 服务:com.ukui.panel.desktop 路径:/ 接口:com.ukui.panel.desktop 方法:AddToTaskbar (String desktop) ↦ (Boolean arg_0) //添加到任务栏 方法:CheckIfExist (String desktop) ↦ (Boolean arg_0) //检测任务栏是否已经存在此应用 方法:RemoveFromTaskbar (String desktop) ↦ (Boolean arg_0) //从任务栏移除

  • 服务:org.ukui.panel.daemon 路径:/convert/desktopwid 接口:org.ukui.panel.daemon 方法:WIDToDesktop (Int32 id) ↦ (String arg_0) //根据窗口id找到其对应的desktop文件,进行分组显示

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