用於突出顯示目前螢幕的腳本 highlight_focus 不起作用

我想從下面的討論中安裝這個腳本，它可以讓我突出顯示目前螢幕。

https://askubuntu.com/questions/665155/how-to-highlight-current-screen-or-window?newreg=ad5b4c91128e4c34a4c864548a7ad026

我使用 linux mint 和 Cinnamon 桌面，我按照說明安裝wmctrl，將腳本另存為highlight_focus，註銷並使用 python3 執行腳本。

我收到的輸出如下：

no second screen seems to be connected
Traceback (most recent call last):
 File "/home/fabrizio/Documents/Linux Scripts/highlight_focus.py", line 50, in <module>
   left_scr = screendata[1][0][0]; right_scr = screendata[1][1]
TypeError: 'NoneType' object is not subscriptable

我有三個螢幕、兩個顯示器（一個是 HDMI，另一個是 DVI）和原來的筆記型電腦螢幕，該螢幕已停用。

此外，這是腳本中觸發錯誤的程式碼：

def get_onscreen():
   # get the size of the desktop, the names of both screens and the x-resolution of the left screen
   resdata = subprocess.check_output(["xrandr"]).decode("utf-8")
   if resdata.count(" connected") == 2:
       resdata = resdata.splitlines()
       r = resdata[0].split(); span = int(r[r.index("current")+1])
       screens = [l for l in resdata if " connected" in l]
       lr = [[(l.split()[0], int([s.split("x")[0] for s in l.split() if "+0+0" in s][0])) for l in screens if "+0+0" in l][0],
              [l.split()[0] for l in screens if not "+0+0" in l][0]]
       return [span, lr]
   else:
       print("no second screen seems to be connected")

該腳本由Jacob Vlijm在 Ask Ubuntu 上創建。

我的系統：

Distributor ID: LinuxMint
Description:    Linux Mint 18 Sarah
Release:    18
Codename:   sarah
Linux fabrizio-Lenovo-G50-70 4.6.0-040600-generic #201606100558 SMP Fri Jun 10 10:01:15 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux

這是的輸出xrand：

Screen 0: minimum 8 x 8, current 3840 x 1080, maximum 32767 x 32767
eDP1 connected (normal left inverted right x axis y axis)
  1366x768      60.00 +
  1360x768      59.80    59.96  
  1280x720      60.00  
  1024x768      60.00  
  1024x576      60.00  
  960x540       60.00  
  800x600       60.32    56.25  
  864x486       60.00  
  640x480       59.94  
  720x405       60.00  
  680x384       60.00  
  640x360       60.00  
DP1 connected primary 1920x1080+0+0 (normal left inverted right x axis y axis) 521mm x 293mm
  1920x1080     60.00*+
  1680x1050     59.95  
  1600x900      60.00  
  1280x1024     75.02    60.02  
  1440x900      59.89  
  1280x800      59.81  
  1152x864      75.00  
  1280x720      60.00  
  1024x768      75.03    70.07    60.00  
  832x624       74.55  
  800x600       72.19    75.00    60.32    56.25  
  640x480       75.00    72.81    66.67    59.94  
  720x400       70.08  
HDMI1 connected 1920x1080+1920+0 (normal left inverted right x axis y axis) 521mm x 293mm
  1920x1080     60.00*+  50.00    59.94  
  1680x1050     59.88  
  1600x900      60.00  
  1280x1024     75.02    60.02  
  1440x900      59.90  
  1280x800      59.91  
  1152x864      75.00  
  1280x720      60.00    50.00    59.94  
  1024x768      75.03    70.07    60.00  
  832x624       74.55  
  800x600       72.19    75.00    60.32    56.25  
  720x576       50.00  
  720x480       60.00    59.94  
  640x480       75.00    72.81    66.67    60.00    59.94  
  720x400       70.08  
HDMI2 disconnected (normal left inverted right x axis y axis)
VIRTUAL1 disconnected (normal left inverted right x axis y axis)

我已經更改了原始腳本。它現在檢查是否有超過 1 個監視器（不完全是 2 個）。我還更改了主動監視器檢測邏輯。它仍然不適用於 2 台以上的顯示器，但應該適合您。

#!/usr/bin/env python3
"""
In a side-by-side dual monitor setup (left-right), the script below will give
a short dim- flash on the newly focussed screen if the focussed screen changes
"""

import subprocess
import time

def get_wposition():
   # get the position of the currently frontmost window
   try:
       w_data = subprocess.check_output(["wmctrl", "-lG"]).decode("utf-8").splitlines()
       frontmost = subprocess.check_output(["xprop", "-root", "_NET_ACTIVE_WINDOW"]).decode("utf-8").split()[-1].strip()
       z = 10-len(frontmost); frontmost = frontmost[:2]+z*"0"+frontmost[2:]
       return [int(l.split()[2]) for l in w_data if frontmost in l][0]
   except subprocess.CalledProcessError:
       pass

def get_onscreen():
   # get the size of the desktop, the names of both screens and the x-resolution of the left screen
   resdata = subprocess.check_output(["xrandr"]).decode("utf-8")
   if resdata.count(" connected") >= 2:
       resdata = resdata.splitlines()
       r = resdata[0].split(); span = int(r[r.index("current")+1])
       screens = [l for l in resdata if " connected" in l]
       lr = [[(l.split()[0], int([s.split("x")[0] for s in l.split() if "+0+0" in s][0])) for l in screens if "+0+0" in l][0],
              [l.split()[0] for l in screens if not "+0+0" in l and "+0" in l][0]]
       return [span, lr]
   else:
       print("no second screen seems to be connected")

def scr_position(span, limit, pos):
   # determine if the frontmost window is on the left- or right screen
   if limit < pos < span:
       return [right_scr, left_scr]
   else:
       return [left_scr, right_scr]

def highlight(scr1):
   # highlight the "active" window, dim the other one
   subprocess.Popen([ "xrandr", "--output", scr1, "--brightness", "0.3"])
   time.sleep(0.1)
   subprocess.Popen([ "xrandr", "--output", scr1, "--brightness", "1.0"])

# determine the screen setup
screendata = get_onscreen()
left_scr = screendata[1][0][0]; right_scr = screendata[1][1]
print(left_scr, right_scr)
limit = screendata[1][0][1]; span = screendata[0]

# set initial highlight
oncurrent1 = []

while True:
   time.sleep(0.5)
   pos = get_wposition()
   # bypass possible incidental failures of the wmctrl command
   if pos != None:
       oncurrent2 = scr_position(span, limit, pos)
       # only set highlight if there is a change in active window
       if oncurrent2 != oncurrent1:
           highlight(oncurrent2[0])
       oncurrent1 = oncurrent2

引用自：https://unix.stackexchange.com/questions/342228