Delete multiline input when doing an "Update", History added to HowDoI using up/down keys

Demo_HowDoI.py

@@ -1,6 +1,6 @@
 import PySimpleGUI as sg
 import subprocess
-import howdoi
+
 
 # Test this command in a dos window if you are having trouble.
 HOW_DO_I_COMMAND =  'python -m howdoi.howdoi -n 2'
@@ -17,27 +17,46 @@ def HowDoI():
     :return: never returns
     '''
     # -------  Make a new FlexForm  ------- #
-    # Set system-wide options that will affect all future forms.  Give our form a spiffy look and feel
-    sg.SetOptions(background_color='#9FB8AD', text_element_background_color='#9FB8AD', element_background_color='#9FB8AD', scrollbar_color=None, input_elements_background_color='#F7F3EC', button_color=('white', '#475841'))
-    form = sg.FlexForm('How Do I ??', auto_size_text=True, default_element_size=(30, 2), icon=DEFAULT_ICON)
+    sg.ChangeLookAndFeel('GreenTan')            # give our form a spiffy set of colors
+
+    form = sg.FlexForm('How Do I ??', default_element_size=(30, 2), icon=DEFAULT_ICON, font=('Helvetica',' 13'), default_button_element_size=(8,2), return_keyboard_events=True)
+
+    multiline_elem = sg.Multiline(size=(85, 5), enter_submits=True, key='query', do_not_clear=False)
+
     layout =  [
                 [sg.Text('Ask and your answer will appear here....', size=(40, 1))],
-                [sg.Output(size=(88, 20))],
-                [ sg.Spin(values=(1, 2, 3, 4), initial_value=1, size=(2, 1), key='Num Answers'), sg.T('Num Answers'), sg.Checkbox('Display Full Text', key='full text')],
-                [sg.Multiline(size=(85, 5), enter_submits=True, key='query'),
+                [sg.Output(size=(127, 30), font=('Helvetica 10'))],
+                [ sg.Spin(values=(1, 2, 3, 4), initial_value=1, size=(2, 1), key='Num Answers', font='Helvetica 15'), sg.T('Num Answers',font='Helvetica 15'), sg.Checkbox('Display Full Text', key='full text', font='Helvetica 15')],
+                [multiline_elem,
                 sg.ReadFormButton('SEND', button_color=(sg.YELLOWS[0], sg.BLUES[0]), bind_return_key=True),
                 sg.SimpleButton('EXIT', button_color=(sg.YELLOWS[0], sg.GREENS[0]))]
               ]
     form.Layout(layout)
     # ---===--- Loop taking in user input and using it to query HowDoI --- #
+    command_history = []
+    history_offset = 0
     while True:
         (button, value) = form.Read()
-
-        if button == 'SEND':
-            QueryHowDoI(value['query'], value['Num Answers'], value['full text'])      # send string without carriage return on end
-        else:
+        if button is 'SEND':
+            query = value['query'].rstrip()
+            QueryHowDoI(query, value['Num Answers'], value['full text'])  # send the string to HowDoI
+            command_history.append(query)
+            history_offset = len(command_history)
+            multiline_elem.Update('')                       # manually clear input because keyboard events blocks clear
+        elif button is None or button is 'EXIT':
             break           # exit button clicked
-
+        elif 'Up' in button:
+            history_offset -= 1 * (history_offset > 0)      # decrement is not zero
+            command = command_history[history_offset]
+            multiline_elem.Update(command)
+        elif 'Down' in button:
+            history_offset += 1 * (history_offset < len(command_history)-1) # increment up to end of list
+            if history_offset >= len(command_history):
+                history_offset = len(command_history)-1
+            command = command_history[history_offset]
+            multiline_elem.Update(command)
+        elif 'Escape' in button:
+            multiline_elem.Update('')                       # manually clear input because keyboard events blocks clear
     exit(69)
 
 def QueryHowDoI(Query, num_answers, full_text):
@@ -51,8 +70,8 @@ def QueryHowDoI(Query, num_answers, full_text):
     full_text_option = ' -a' if full_text else ''
     t = subprocess.Popen(howdoi_command + ' '+ Query + ' -n ' + str(num_answers)+full_text_option, stdout=subprocess.PIPE)
     (output, err) = t.communicate()
-    print('You asked: '+ Query)
-    print('_______________________________________')
+    print('{:^88}'.format(Query.rstrip()))
+    print('_'*60)
     print(output.decode("utf-8") )
     exit_code = t.wait()
 

PySimpleGUI.py

@@ -6,7 +6,6 @@ import tkinter.scrolledtext as tkst
 import tkinter.font
 import datetime
 import sys
-from sys import platform
 import textwrap
 
 # ----====----====----==== Constants the user CAN safely change ====----====----====----#
@@ -471,6 +470,7 @@ class Multiline(Element):
         return
 
     def Update(self, NewValue):
+        self.TKText.delete('1.0', tk.END)
         self.TKText.insert(1.0, NewValue)
 
     def Get(self):