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+#!/usr/bin/env python3
+# vim: set ts=3 sts=3 sw=3 et:
+# File: src/tkstackrpms/tkstackrpms.py
+# Location: https://bgstack15.ddns.net/cgit/tkstackrpms/
+# Author: bgstack15
+# Startdate: 2024-03-28-5 14:49
+# Title: Stackrpms extensions to Tcl/Tk - Python 3.x library
+# Purpose: My small additions to tkinter
+# Project: python3-tkstackrpms
+# History:
+#    2024-03-28 started as component of srb_lib
+#    2024-04-07 moved to its own project
+# Usage:
+#    import tkstackrpms as stk
+# References:
+#    logout-manager-tcl, lmlib.py
+#    file:///usr/include/X11/keysymdef.h
+#    http://stackoverflow.com/questions/3221956/what-is-the-simplest-way-to-make-tooltips-in-tkinter/36221216#36221216
+#    https://stackoverflow.com/questions/63871376/tkinter-widget-cgetvariable/63871784#63871784
+#    https://coderslegacy.com/python/create-a-status-bar-in-tkinter/
+#    https://stackoverflow.com/questions/38329996/enable-mouse-wheel-in-spinbox-tk-python
+#    https://insolor.github.io/effbot-tkinterbook-archive/tkinter-events-and-bindings.htm
+#    https://stackoverflow.com/questions/27533244/how-to-make-a-flashing-text-box-in-tkinter/78277443#78277443
+# Improve:
+# Dependencies:
+#    dep-devuan: python3-tkinter, python3-pil.imagetk
+#    rec-devuan: python3-cairosvg
+import sys
+try:
+   from tkinter import *
+except ModuleNotFoundError:
+   print(f"Fatal! Library tkstackrpms needs tkinter and more, which are not packaged by pip. Try OS packages python3-tk, python3-pil.imagetk.",file=sys.stderr)
+   sys.exit(1)
+from tkinter import Spinbox as tkSpinbox, Checkbutton as tkCheckbutton, Entry as tkEntry, Radiobutton as tkRadiobutton
+from pathlib import Path
+import glob, re, os, configparser
+# has to happen after tkinter
+try:
+   from PIL import Image, ImageTk
+except ModuleNotFoundError as e:
+   print(f"Fatal! Library tkstackrpms needs pil.imagetk which is part of pillow. Try OS package python3-pil.imagetk or pip install pillow.",file=sys.stderr)
+   print(e,file=sys.stderr)
+   sys.exit(1)
+
+USE_SVG = False
+try:
+   from cairosvg import svg2png
+   USE_SVG = True
+except:
+   print(f"Warning: Library tkstackrpms uses cairosvg to work with SVG images. You can continue without svg support, or retry after getting OS package python3-cairosvg or pip install cairosvg.",file=sys.stderr)
+
+MAX_RECURSION = 10 # safety valve for any recursion
+
+class Tooltip:
+   """
+   It creates a tooltip for a given widget as the mouse goes on it.
+   see:
+   http://stackoverflow.com/questions/3221956/
+          what-is-the-simplest-way-to-make-tooltips-
+          in-tkinter/36221216#36221216
+   http://www.daniweb.com/programming/software-development/
+          code/484591/a-tooltip-class-for-tkinter
+   - Originally written by vegaseat on 2014.09.09.
+   - Modified to include a delay time by Victor Zaccardo on 2016.03.25.
+   - Modified
+       - to correct extreme right and extreme bottom behavior,
+       - to stay inside the screen whenever the tooltip might go out on
+         the top but still the screen is higher than the tooltip,
+       - to use the more flexible mouse positioning,
+       - to add customizable background color, padding, waittime and
+         wraplength on creation
+     by Alberto Vassena on 2016.11.05. Improved by Stevoisiak (https://stackoverflow.com/users/3357935/stevoisiak) and crxguy52 (https://stackoverflow.com/users/6106104/crxguy52)
+     Tested on Ubuntu 16.04/16.10, running Python 3.5.2
+   """
+   def __init__(self, widget,
+                *,
+                bg='#FFFFEA',
+                pad=(5, 3, 5, 3),
+                text='widget info',
+                waittime=400,
+                wraplength=250):
+      self.waittime = waittime  # in miliseconds, originally 500
+      self.wraplength = wraplength  # in pixels, originally 180
+      self.widget = widget
+      self.text = text
+      self.widget.bind("<Enter>", self.onEnter)
+      self.widget.bind("<Leave>", self.onLeave)
+      self.widget.bind("<ButtonPress>", self.onLeave)
+      self.bg = bg
+      self.pad = pad
+      self.id = None
+      self.tw = None
+
+   def onEnter(self, event=None):
+      self.schedule()
+
+   def onLeave(self, event=None):
+      self.unschedule()
+      self.hide()
+
+   def schedule(self):
+      self.unschedule()
+      self.id = self.widget.after(self.waittime, self.show)
+
+   def unschedule(self):
+      id_ = self.id
+      self.id = None
+      if id_:
+         self.widget.after_cancel(id_)
+
+   def show(self):
+      def tip_pos_calculator(widget, label,
+                             *,
+                             tip_delta=(10, 5), pad=(5, 3, 5, 3)):
+         w = widget
+         s_width, s_height = w.winfo_screenwidth(), w.winfo_screenheight()
+         width, height = (pad[0] + label.winfo_reqwidth() + pad[2],
+                          pad[1] + label.winfo_reqheight() + pad[3])
+         mouse_x, mouse_y = w.winfo_pointerxy()
+         x1, y1 = mouse_x + tip_delta[0], mouse_y + tip_delta[1]
+         x2, y2 = x1 + width, y1 + height
+         x_delta = x2 - s_width
+         if x_delta < 0:
+            x_delta = 0
+         y_delta = y2 - s_height
+         if y_delta < 0:
+            y_delta = 0
+         offscreen = (x_delta, y_delta) != (0, 0)
+         if offscreen:
+            if x_delta:
+               x1 = mouse_x - tip_delta[0] - width
+            if y_delta:
+               y1 = mouse_y - tip_delta[1] - height
+         offscreen_again = y1 < 0  # out on the top
+         if offscreen_again:
+            # No further checks will be done.
+            # TIP:
+            # A further mod might automagically augment the
+            # wraplength when the tooltip is too high to be
+            # kept inside the screen.
+            y1 = 0
+         return x1, y1
+      bg = self.bg
+      pad = self.pad
+      widget = self.widget
+      # creates a toplevel window
+      self.tw = Toplevel(widget)
+      # Leaves only the label and removes the app window
+      self.tw.wm_overrideredirect(True)
+      win = Frame(self.tw,
+                     background=bg,
+                     borderwidth=0)
+      label = Label(win,
+                       text=self.text,
+                       justify=LEFT,
+                       background=bg,
+                       relief=SOLID,
+                       borderwidth=0,
+                       wraplength=self.wraplength)
+      label.grid(padx=(pad[0], pad[2]),
+                 pady=(pad[1], pad[3]),
+                 sticky=NSEW)
+      win.grid()
+      x, y = tip_pos_calculator(widget, label)
+      self.tw.wm_geometry("+%d+%d" % (x, y))
+
+   def hide(self):
+      tw = self.tw
+      if tw:
+         tw.destroy()
+      self.tw = None
+
+def mynum(x, type = "all"):
+   # return the complicated numerical value for the weird size options
+   f = re.split("[^0-9]+",x)
+   try:
+      f0 = int(f[0])
+   except:
+      f0 = 0
+   try:
+      f1 = int(f[1])
+   except:
+      f1 = 0
+   if type == "all":
+      return f0 * 100 + f1 if len(f) >= 2 else 0
+   else:
+      return f0
+
+def image_from_svg(filename = "",size = "48"):
+   # open svg
+   if USE_SVG == 1:
+      svg2png(url=filename,write_to="/tmp/lm_temp_image.png",parent_width = size,parent_height = size)
+      photo = Image.open("/tmp/lm_temp_image.png")
+   else:
+      photo = Image.new("RGBA",[size,size])
+   return photo
+
+def sort_sizes(x):
+   # Original reference so#46228101
+   value = x.split("/")[5]
+   return mynum(value, "all")
+
+def find_best_size_match(size, thelist):
+   # return item from sorted thelist whose split("/")[5] is the first to meet or exceed the requested size
+   try:
+      default = thelist[-1]
+   except:
+      default = None
+   return next(( i for i in thelist if mynum(i.split("/")[5],"real") >= size ), default)
+
+def empty_photoimage(size=24):
+   photo = Image.new("RGBA",[size,size])
+   return ImageTk.PhotoImage(image=photo)
+
+def get_scaled_icon(icon_name, size = 24, icon_theme = "default", fallback_icon_name = "", category = "actions"):
+   iconfilename = None
+   # if name is a specific filename, just use it.
+   if Path(icon_name).is_file():
+      #print("This is a file:",icon_name)
+      iconfilename = icon_name
+   else:
+      if icon_theme == "default":
+         # this should not happen, because the Initialize_config should have checked gtk3 default value.
+         icon_theme = "hicolor"
+      # so now that icon_theme is defined, let us go find the icon that matches the requested name and size, in the actions category
+      #print("Using icon theme",icon_theme)
+      # category is the fd.o icon category. logout-manager-tcl hardcoded "action"
+      iconfilename = get_filename_of_icon(name=icon_name, theme=icon_theme, size=size, category=category, allow_svg = USE_SVG)
+   # So now we think we have derived the correct filename
+   try:
+      #print("Trying icon file",iconfilename)
+      # try an svg
+      if re.compile(r".*\.svg").match(iconfilename):
+         #print("Trying svg...")
+         photo = image_from_svg(filename=iconfilename, size=size)
+      else:
+         photo = Image.open(iconfilename)
+   except Exception as f:
+      print(f"Error with icon file: {f}.",file=sys.stderr)
+      return empty_photoimage()
+   photo.thumbnail(size=[size, size])
+   try:
+      photo = ImageTk.PhotoImage(photo)
+   except Exception as e:
+      print("Error was ",e,file=sys.stderr)
+   # If I ever add HiDPI support, multiple size here by the factor. So, size * 1.25
+   return photo
+
+def get_filename_of_icon(name, theme = "hicolor", size = 48, category = "actions", allow_svg = False):
+   # poor man's attempt at walking through fd.o icon theme
+   filename = None
+   # example: Adwaita system-log-out
+   if theme == "default" or theme is None:
+      try:
+         theme = get_gtk3_default_icon_theme()
+      except:
+         theme = "hicolor"
+   # first, find all files underneath /usr/share/icons/$THEME/$SIZE
+   #print("Finding filename of icon, theme=",theme,"category=",category,"name=",name)
+    # to exclude the scalable/ contents, replace dir 5 asterisk with [0-9]*
+   results = []
+   base_dir = "/usr/share/icons/"
+   file_filters = ".*"
+   if not allow_svg:
+      file_filters = ".{png,PNG}"
+   # I have no idea if this is xdg icon theme compliant, but it is a valiant attempt.
+   # 1. try (requested) req-theme, req-category, req-name first
+   results = glob.glob(base_dir+theme+"/*/"+category+"/"+name+file_filters)
+   # 2. try req-theme, (generic) gen-category, req-name
+   if len(results) == 0:
+      # no results with that category, so try all categories
+      results = glob.glob(base_dir+theme+"/*/*/"+name+file_filters)
+   # 3. try "gnome", req-category, req-name
+   if len(results) == 0:
+      results = glob.glob(base_dir+"gnome"+"/*/"+category+"/"+name+file_filters)
+   # 4. try "gnome", gen-category, req-name
+   if len(results) == 0:
+      results = glob.glob(base_dir+"gnome"+"/*/*/"+name+file_filters)
+   # 5. try "hicolor", req-category, req-name
+   if len(results) == 0:
+      results = glob.glob(base_dir+"hicolor"+"/*/"+category+"/"+name+file_filters)
+   # 6. try "hicolor", gen-category, req-name
+   if len(results) == 0:
+      results = glob.glob(base_dir+"hicolor"+"/*/*/"+name+file_filters)
+   # the sort arranges it so a Numix/24 dir comes before a Numix/24@2x dir
+   results = sorted(results, key=sort_sizes)
+   #print(results)
+   # now find the first one that matches
+   filename = find_best_size_match(size,results)
+   return filename
+
+def get_gtk3_default_icon_theme():
+   # abstracted so it does not clutter get_scaled_icon
+   name = "hicolor"
+   gtk3_config_path = os.path.join(os.path.expanduser("~"),".config","gtk-3.0","settings.ini")
+   gtk3_config = configparser.ConfigParser()
+   gtk3_config.read(gtk3_config_path)
+   try:
+      if 'Settings' in gtk3_config:
+         name = gtk3_config['Settings']['gtk-icon-theme-name']
+      elif 'settings' in gtk3_config:
+         name = gtk3_config['settings']['gtk-icon-theme-name']
+   except:
+      # supposed failsafe: keep name = hicolor
+      pass
+   #print("Found gtk3 default theme:",name)
+   return name
+
+class StatusBar(Frame):
+   def __init__(self, master, var = None):
+      Frame.__init__(self, master, borderwidth = 1, background = "darkgray")
+      if var:
+         self.label = Label(self,textvariable=var)
+      else:
+         self.label = Label(self)
+      self.label.pack(side=LEFT)
+      #self.pack(side=BOTTOM, fill=X)
+      self.grid(row=100,column=0,columnspan=100)
+   def set(self, newText):
+      self.label.config(text=newText)
+   def clear(self):
+      self.label.config(text="")
+
+class Spinbox(tkSpinbox):
+   """
+   This enables mouse scrolling without having to add it to each instance.
+   """
+   def __init__(self, *args, **kwargs):
+      tkSpinbox.__init__(self, *args, **kwargs)
+      self.bind('<MouseWheel>', self.mouseWheel)
+      self.bind('<Button-4>', self.mouseWheel)
+      self.bind('<Button-5>', self.mouseWheel)
+
+   def mouseWheel(self, event):
+      if event.num == 5 or event.delta == -120:
+         self.invoke('buttondown')
+      elif event.num == 4 or event.delta == 120:
+         self.invoke('buttonup')
+
+class Checkbutton(tkCheckbutton):
+   """
+   Add a specific function to these key-up/button-up sequences, without having to add it to each instance individually.
+   """
+   def __init__(self, *args, **kwargs):
+      func = None
+      if "func" in kwargs.keys():
+         func = kwargs.pop("func")
+      tkCheckbutton.__init__(self, *args, **kwargs)
+      if func:
+         self.bind("<ButtonRelease-1>",func)
+         self.bind("<KeyRelease-space>",func)
+         self.bind("<KeyRelease-Return>",func)
+
+class Entry(tkEntry):
+   def __init__(self, *args, **kwargs):
+      func = None
+      if "func" in kwargs.keys():
+         func = kwargs.pop("func")
+      tkEntry.__init__(self, *args, **kwargs)
+      if func:
+         self.bind("<Key-Return>",func)
+         self.bind("<Key-KP_Enter>",func)
+         # Do not need specific shift-tab stuff because FocusOut is possible!
+         #self.bind("<Key-Tab>",func)
+         #self.bind("<Shift-KeyPress-Tab>",func)
+         self.bind("<FocusOut>",func)
+
+class Radiobutton(tkRadiobutton):
+   """
+   Extends tkRadioButton:
+   * Store self.__var attribute that connects to the tk.IntVar() used
+   * Moves between all associated radio buttons with up/down keys!
+   """
+   @property
+   def var(self):
+      return self.__var
+
+   @property
+   def value(self) -> int:
+      return self.__var.get()
+
+   @value.setter
+   def value(self, value):
+      self.__var.set(int(value))
+
+   def __init__(self, *args, **kwargs):
+      self.__var = tk.IntVar() if not "variable" in kwargs else kwargs["variable"]
+      tkRadiobutton.__init__(self, *args, **{**kwargs, "variable":self.__var})
+      self.bind("<Key-Down>",self.scroll_with_keys)
+      self.bind("<Key-Up>",self.scroll_with_keys)
+      self.bind("<Key-Home>",self.scroll_with_keys)
+      self.bind("<Key-End>",self.scroll_with_keys)
+
+   def add_item_if_var_matches(self, otherwidget, samevar, thelist):
+      j1 = None
+      try:
+         j1 = otherwidget.cget("variable")
+      except:
+         pass
+      if j1 == samevar:
+         #print(f"found {otherwidget} that uses var {j1}")
+         thelist.append(otherwidget)
+      return thelist
+
+   def list_all_child_items_that_use_var(self, thistoplevel, thisvar, thislist, depth):
+      # safety valve
+      if depth >= MAX_RECURSION:
+         raise Exception("You dug too deep with recursion in list_all_child_items")
+      for i in thistoplevel.winfo_children():
+         thislist = self.add_item_if_var_matches(i,thisvar,thislist)
+         thislist = self.list_all_child_items_that_use_var(i,thisvar,thislist,depth+1) # recurse
+      return thislist
+
+   def widget_key(self,a):
+      """ Used to sort radio options by 'value'. """
+      aval = None
+      try:
+         aval = a.cget("value")
+      except:
+         pass
+      return aval
+
+   def scroll_with_keys(self, arg1 = None, arg2 = None, arg3 = None):
+      """ This depends on you setting the object.var property to match the variable. """
+      # prepare all items that also use this variable
+      # nametowidget is a tk trick to get the top-level parent object of the current widget. That is, the app or top window.
+      items = self.list_all_child_items_that_use_var(self.nametowidget("."),self.cget("variable"),[],depth=0)
+      # sort them by value, in case they are not in order
+      items.sort(key=self.widget_key)
+      # we are using 1-indexing here.
+      items.insert(0, None)
+      #print(f"debug: now have items {items}")
+      # prepare the operation
+      direction = None
+      if arg1.keysym == "Up":
+         direction = +1
+      elif arg1.keysym == "Down":
+         direction = +0
+      #print(f"Must go direction {direction} in list {items}, using {self.__var.get()}")
+      # Because of the 1-indexing, by always adding one, we do scroll through the values the way you would expect.
+      if direction is not None:
+         self.__var.set((self.__var.get()+direction) % (len(items)-1) + 1)
+      elif arg1.keysym in ["Home"]:
+         self.__var.set(items[1].cget("value"))
+      elif arg1.keysym in ["End"]:
+         self.__var.set(items[-1].cget("value"))
+      # and now focus on the object whose value matches
+      for i in items:
+         i1 = None
+         try:
+            i1 = i.cget("value")
+         except:
+            pass
+         if i1 == self.__var.get():
+            i.focus()
+            break
+
+def flash_entry(this_entry, colorlist, ms = 1000):
+   """
+   Flash the offending entry box through the colorlist, one color every 'ms' milliseconds.
+   Example:
+      flash_entry(entry_that_was_invalid,["red","white"])
+   """
+   thiscolor = colorlist.pop(0)
+   this_entry.config(background = thiscolor)
+   if len(colorlist) > 0:
+      top = this_entry._nametowidget(this_entry.winfo_parent())
+      top.after(ms, lambda te=this_entry, c=colorlist, ms=ms: flash_entry(te,c,ms))