WIP: try with rsvg and cairorsvg-and-cairo

   Unfortunately I just couldn't get the examples working with rsvg and
   cairo, so I will have to try something else.
   References:
   http://code.activestate.com/lists/python-list/595078/
   https://grokbase.com/t/python/python-list/112fsd3tyw/displaying-svg-in-tkinter-using-cairo-and-rsvg

2 files changed, 186 insertions, 7 deletions

diff --git a/logout-manager-tcl.py b/logout-manager-tcl.py
index cfeb851..0a0a1f7 100755
--- a/logout-manager-tcl.py
+++ b/logout-manager-tcl.py
@@ -29,11 +29,8 @@
 #    tkinter: python36-tkinter | python3-tk
 #    PIL: python36-pillow-tk | python3-pil.imagetk
 #    cairo: python36-cairo | python3-cairo
-#    Rsvg: python36-gobject | python3-gobject
+#    Rsvg: python36-gobject | gir1.2-rsvg-3.0
 
-from gi import require_version
-require_version('Rsvg', '2.0')
-from gi.repository import Rsvg
 import os, sys, configparser, glob, re, cairo
 import tkinter as tk
 import tkinter.ttk as ttk
@@ -42,6 +39,11 @@ from pathlib import Path
 from PIL import Image, ImageTk
 sys.path.append("/home/bgirton/dev/logout-manager")
 import lmlib
+WITH_SVG=True
+if not WITH_SVG is None and WITH_SVG:
+   from gi import require_version
+   require_version('Rsvg', '2.0')
+   from gi.repository import Rsvg as rsvg
 #if TkVersion < 8.6:
 #   USE_PRIVATE_TCL_IMAGES = 1
 #   print("Loading private PIL translation layter")
@@ -86,7 +88,7 @@ def convert(bgra_buffer, width, height):
 
 def photoimage_from_svg(file_path_name):
      '''Return a Tkinter.PhotoImage with the content set to the rendered SVG.'''
-     svg = rsvg.Handle(file=file_path_name)
+     svg = rsvg.Handle(file_path_name)
      width, height = svg.get_dimension_data()[:2]
      surface = cairo.ImageSurface(cairo.FORMAT_RGB24, int(width), int(height))
      context = cairo.Context(surface)
@@ -349,8 +351,10 @@ def get_scaled_icon(icon_name, size = 24, icon_theme = "default", fallback_icon_
          photo = photoimage_from_svg(iconfilename)
       else:
          photo = Image.open(iconfilename)
-   except:
-      print("Error with icon file.")
+   except Exception as e:
+      print("Error with icon file:",e)
+      if "gobject" in str(e):
+         raise
       return None
    # If I ever add HiDPI stuff, multiple size here by the factor. So, size * 1.25
    photo.thumbnail(size=[size, size])
diff --git a/sample.py b/sample.py
new file mode 100755
index 0000000..7ad8f07
--- /dev/null
+++ b/sample.py
@@ -0,0 +1,175 @@
+#!/usr/bin/env python3
+# File: sample.py
+# License: CC-BY-SA 4.0
+# Author: bgstack15
+# Startdate: 2019-06-14 17:42
+# Title: Learning how to display an svg in tcl/tk with python
+# Purpose: 
+# History:
+# Usage:
+# References:
+#    rsvg https://stackoverflow.com/questions/10393675/rsvg-with-python-3-2-on-ubuntu/19744099#19744099
+#    svg for tkinter http://code.activestate.com/lists/python-list/595078/
+# Improve:
+#    add svg support
+# Dependencies:
+#    package: RPM | DPKG
+#    tkinter: python36-tkinter | python3-tk
+#    PIL: python36-pillow-tk | python3-pil.imagetk
+#    cairo: python36-cairo | python3-cairo
+#    Rsvg: python36-gobject | gir1.2-rsvg-3.0
+
+import os, sys, configparser, glob, re, cairo
+import tkinter as tk
+import tkinter.ttk as ttk
+from functools import partial
+from pathlib import Path
+from PIL import Image, ImageTk
+sys.path.append("/home/bgirton/dev/logout-manager")
+import lmlib
+import inspect # here for troubleshooting sample.py only
+WITH_SVG=True
+if not WITH_SVG is None and WITH_SVG:
+   from gi import require_version
+   require_version('Rsvg', '2.0')
+   from gi.repository import Rsvg as rsvg
+#if TkVersion < 8.6:
+#   USE_PRIVATE_TCL_IMAGES = 1
+#   print("Loading private PIL translation layter")
+#   def PhotoImage_from_png(file):
+#      return ImageTk.PhotoImage(file=file)
+
+config = lmlib.Initialize_config()
+actions = lmlib.Actions
+
+# graphical classes and functions
+print("Loading graphics...")
+
+def _alpha_blending(rgba, back):
+     "Return a rgb tuple composed from a rgba and back(ground) tuple/list."
+     paired = zip(rgba[:-1], back)
+     alpha = rgba[-1]
+     tmp = list()
+     for upper, lower in paired:
+         blend = int((((255 - alpha) * lower) + (alpha * upper)) / 255)
+         tmp.append(blend)
+
+     return(tuple(tmp))
+
+def convert(bgra_buffer, width, height):
+     "Convert bgra buffer to photoimage put"
+     idx = 0
+     end = len(bgra_buffer)
+     arguments = list()
+
+     while idx < end:
+         rgba = (ord(str(bgra_buffer[idx + 2])),
+                 ord(str(bgra_buffer[idx + 1])),
+                 ord(str(bgra_buffer[idx + 0])),
+                 ord(str(bgra_buffer[idx + 3])))
+         back = (255, 255, 255)
+         rgb = _alpha_blending(rgba, back)
+         arguments += rgb
+         idx += 4
+
+     template = ' '.join(height *['{%s}' % (''.join(width*["#%02x%02x%02x"]))])
+     #print(template)
+     #print(arguments[-1])
+     return(template % tuple(arguments))
+
+def photoimage_from_svg(file_path_name):
+     '''Return a Tkinter.PhotoImage with the content set to the rendered SVG.'''
+     svg = rsvg.Handle()
+     svg.new_from_file(file_name=file_path_name)
+
+     #print(svg)
+     #print(inspect.getmembers(rsvg.Handle))
+     #svg.open(file=file_path_name)
+
+     #print(svg.height)
+     #print(svg.get_dimensions().height)
+     #print(inspect.getmembers(rsvg.DimensionData))
+
+     #width, height = svg.get_dimensions()[:2]
+     width, height = [48,48]
+     surface = cairo.ImageSurface(cairo.FORMAT_RGB24, int(width), int(height))
+     context = cairo.Context(surface)
+     svg.render_cairo(context)
+     image = tk.PhotoImage(width=width, height=height)
+     data = convert(surface.get_data(), width, height)
+     image.put(data)
+     return(image)
+
+def get_scaled_icon(icon_name, size = 24, icon_theme = "default", fallback_icon_name = ""):
+   iconfilename = None
+
+   # assume icon_name is file.
+   iconfilename = icon_name
+
+   # So now that we think we have derived the correct filename...
+   photo = photoimage_from_svg(iconfilename)
+   #try:
+   #   print("Trying svg file",iconfilename)
+   #   # try an svg
+   #   if re.compile(".*\.svg").match(iconfilename):
+   #      print("Trying svg...")
+   #      photo = photoimage_from_svg(iconfilename)
+   #except Exception as e:
+   #   print("Error with icon file:",e)
+   #   if "gobject" in str(e):
+   #      raise
+   #   return None
+   photo.thumbnail(size=[size, size])
+   try:
+      photo2 = ImageTk.PhotoImage(photo)
+   except Exception as e:
+      print("Error was ",e)
+   return photo2
+
+class App:
+   def __init__(self, master):
+      frame = tk.Frame(master)
+      frame.grid(row=0)
+
+      self.buttonLock = tk.Button(frame, text="Lock", underline=3, command=partial(actions.lock,config))
+      self.buttonLock.grid(row=0,column=0)
+      # WORKS master.bind_all("<Alt-k>", something)
+      # PASSES 2 params when expecting 1  master.bind_all("<Alt-k>", self.buttonLock.invoke)
+      master.bind_all("<Alt-k>", partial(actions.lock,config))
+
+      # WORKS, for basic image loading.
+      self.photoLogout = get_scaled_icon(config.get_logout_icon(), config.get_icon_size(), config.get_icon_theme())
+      self.buttonLogout = tk.Button(frame, text="Logout", underline=0, command=lambda: actions.logout(config), image=self.photoLogout, compound=tk.LEFT)
+      master.bind_all("<Alt-l>", partial(actions.logout,config))
+      Tooltip(self.buttonLogout, text="HERE IS SOMETHING!")
+      self.buttonLogout.grid(row=0,column=1)
+
+      #self.buttonCancel = tk.Button(frame, text="Cancel", underline=0, command=frame.quit)
+      self.buttonCancel = tk.Button(frame, text="Cancel", underline=0, command=self.quitaction)
+      self.buttonCancel.grid(row=1,columnspan=8,sticky=tk.W+tk.E)
+      master.bind_all("<Alt-c>", self.quitaction)
+
+   # Found this after trial and error.
+   def quitaction(self,b=None):
+      print("Cancel any logout action.")
+      root.destroy()
+
+# Left here as an example for a mster.bind_all that works.
+#def something(event=None):
+#   print("Got here!")
+
+root = tk.Tk()
+
+# MAIN LOOP
+root.title("Log out options")
+imgicon = get_scaled_icon("/usr/share/icons/Numix/96/actions/system-shutdown.svg",24)
+
+print(imgicon)
+
+root.tk.call('wm','iconphoto', root._w, imgicon)
+app = App(root)
+root.mainloop()
+try:
+   root.destroy()
+except:
+   pass