make gui log messages pane disappear when no messages, and messages c…

…lear when updated

countess/gui/logger.py

@@ -12,6 +12,9 @@ def __init__(self, tk_parent, *a, **k):
         self.heading(0, text="name")
         self.heading(1, text="message")
 
+    def clear(self):
+        self.delete(*self.get_children())
+
 
 class LabeledProgressbar(ttk.Progressbar):
     """A progress bar with a label on top of it, the progress bar value can be set in the
@@ -118,6 +121,14 @@ def remove_pbar(self, message):
             self.progress_bars[message].destroy()
             del self.progress_bars[message]
 
+    def clear(self):
+        self.logger.clear()
+        self.treeview.clear()
+        self.count = 0
+        self.details = {}
+        for message in self.progress_bars:
+            self.remove_pbar(message)
+
 
 class TreeviewDetailWindow(tk.Toplevel):
     def __init__(self, detail, *a, **k):

countess/gui/main.py

@@ -92,7 +92,6 @@ def show_config_subframe(self):
         self.config_scrollbar.grid(row=3, column=1, sticky=tk.NS)
 
         self.logger_subframe = LoggerFrame(self.frame)
-        self.logger_subframe.grid(row=5, columnspan=2, sticky=tk.NSEW)
         self.logger = self.logger_subframe.get_logger(self.node.name)
 
         if self.node.plugin:
@@ -204,6 +203,8 @@ def config_change_task_callback(self):
         self.node_update_thread = threading.Thread(target=self.node.prerun, args=(self.logger,))
         self.node_update_thread.start()
 
+        self.logger_subframe.clear()
+        self.logger_subframe.grid(row=5, columnspan=2, sticky=tk.NSEW)
         self.logger_subframe.after(100, self.config_change_task_callback_2)
         self.change_callback(self.node)
 

countess/gui/tree.py

@@ -13,7 +13,6 @@
 from functools import partial
 
 from countess.core.pipeline import PipelineNode
-from countess.gui.unicode import UNICODE_INFO
 
 
 def _limit(value, min_value, max_value):

countess/gui/unicode.py

@@ -15,4 +15,3 @@
     UNICODE_CROSS = "\u2715"
     UNICODE_PLUS = "\u2795"
     UNICODE_INFO = "\u2139"
-