From bf4b9ffc0c02b45b6659b5170edf3fa1c2613be3 Mon Sep 17 00:00:00 2001
From: MikeTheWatchGuy <mike_barnett@hotmail.com>
Date: Wed, 29 Aug 2018 09:10:19 -0400
Subject: [PATCH] New Demo program - Chat with scrollable command history

---
 Demo_Chat.py | 60 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 60 insertions(+)
 create mode 100644 Demo_Chat.py

diff --git a/Demo_Chat.py b/Demo_Chat.py
new file mode 100644
index 00000000..99d3df49
--- /dev/null
+++ b/Demo_Chat.py
@@ -0,0 +1,60 @@
+import PySimpleGUI as sg
+
+'''
+A chatbot with history
+Scroll up and down through prior commands using the arrow keys
+Special keyboard keys:
+    Up arrow - scroll up in commands
+    Down arrow - scroll down in commands
+    Escape - clear current command
+    Control C - exit form
+'''
+
+def ChatBotWithHistory():
+    # -------  Make a new FlexForm  ------- #
+    sg.ChangeLookAndFeel('GreenTan')            # give our form a spiffy set of colors
+
+    form = sg.FlexForm('Chat window with history', default_element_size=(30, 2), 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)
+    history_elem = sg.T('', size=(20,3))
+    layout =  [
+                [sg.Text('Your output will go here', size=(40, 1))],
+                [sg.Output(size=(127, 30), font=('Helvetica 10'))],
+                [sg.T('Command History'), history_elem],
+                [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 is 'SEND':
+            query = value['query'].rstrip()
+            # EXECUTE YOUR COMMAND HERE
+            print('The command you entered was {}'.format(query))
+            command_history.append(query)
+            history_offset = len(command_history)-1
+            multiline_elem.Update('')                       # manually clear input because keyboard events blocks clear
+            history_elem.Update('\n'.join(command_history[-3:]))
+        elif button is None or button is 'EXIT' or 'c:67' in button:  # quit if exit button, X, or control C
+            break
+        elif 'Up' in button and len(command_history):
+            command = command_history[history_offset]
+            history_offset -= 1 * (history_offset > 0)      # decrement is not zero
+            multiline_elem.Update(command)
+        elif 'Down' in button and len(command_history):
+            history_offset += 1 * (history_offset < len(command_history)-1) # increment up to end of list
+            command = command_history[history_offset]
+            multiline_elem.Update(command)
+        elif 'Escape' in button:
+            multiline_elem.Update('')
+
+    exit(69)
+
+
+ChatBotWithHistory()