Fix flickering screen in KDE

safeeyes/BreakScreen.py

@@ -31,7 +31,8 @@ class BreakScreen:
 	"""
 		Read the break_screen.glade and build the user interface.
 	"""
-	def __init__(self, on_skip, on_postpone, glade_file, style_sheet_path):
+	def __init__(self, context, on_skip, on_postpone, glade_file, style_sheet_path):
+		self.context = context
 		self.on_skip = on_skip
 		self.on_postpone = on_postpone
 		self.is_pretified = False
@@ -170,6 +171,9 @@ class BreakScreen:
 
 			# Set visual to apply css theme. It should be called before show method.
 			window.set_visual(window.get_screen().get_rgba_visual())
+			if self.context['desktop'] == 'kde':
+				# Fix flickering screen in KDE by setting opacity to 1
+				window.set_opacity(1)
 
 			window.move(x, y)
 			window.stick()

safeeyes/Utility.py

@@ -249,6 +249,30 @@ def read_lang_files():
 
 	return languages
 
+
+def desktop_environment():
+	"""
+	Detect the desktop environment.
+	"""
+	desktop_session = os.environ.get('DESKTOP_SESSION')
+	current_desktop = os.environ.get('XDG_CURRENT_DESKTOP')
+	if desktop_session is not None:
+		desktop_session = desktop_session.lower()
+		if desktop_session in ['gnome','unity', 'budgie-desktop', 'cinnamon', 'mate', 'xfce4', 'lxde', 'pantheon', 'fluxbox', 'blackbox', 'openbox', 'icewm', 'jwm', 'afterstep','trinity', 'kde']:
+			return desktop_session
+		elif (desktop_session.startswith('xubuntu') or (current_desktop is not None and 'xfce' in current_desktop)):
+			return 'xfce'
+		elif desktop_session.startswith('ubuntu'):
+			return 'unity'
+		elif desktop_session.startswith('lubuntu'):
+			return 'lxde'
+		elif 'plasma' in desktop_session or desktop_session.startswith('kubuntu') or os.environ.get('KDE_FULL_SESSION') == 'true':
+			return 'kde'
+		elif os.environ.get('GNOME_DESKTOP_SESSION_ID'):
+			return 'gnome'
+	return 'unknown'
+
+
 def lock_screen_command():
 	"""
 	Function tries to detect the screensaver command based on the current envinroment

safeeyes/__main__.py

@@ -256,9 +256,10 @@ def main():
 
 		# Initialize the Safe Eyes Context
 		context['version'] = SAFE_EYES_VERSION
+		context['desktop'] = Utility.desktop_environment()
 
 		tray_icon = TrayIcon(config, language, show_settings, show_about, enable_safeeyes, disable_safeeyes, on_quit)
-		break_screen = BreakScreen(on_skipped, on_postponed, break_screen_glade, Utility.style_sheet_path)
+		break_screen = BreakScreen(context, on_skipped, on_postponed, break_screen_glade, Utility.style_sheet_path)
 		break_screen.initialize(config, language)
 		notification = Notification(language)
 		plugins = Plugins(config)