tkinter

Author: furas

tkinter/redirect-stdout-to-text-widget/main-Label.py

@@ -0,0 +1,69 @@
+#!/usr/bin/env python3
+
+# date: 2020.06.05
+# https://stackoverflow.com/questions/62217254/python-tkinter-make-text-widget-automatically-scroll-with-text-used-with-redir/
+
+import tkinter as tk
+import sys
+import datetime
+
+# --- classes ---
+
+class RedirectLabel(object):
+
+    def __init__(self, widget):
+        """Constructor"""
+        self.output = widget
+
+    def write(self, string):
+        """Add text to the end"""
+        self.output['text'] = self.output['text'] + string
+        # label can't be scrolled
+        
+    # some widgets may need it if they don't have it
+    def flush(self):
+        pass
+    
+# --- functions ---
+        
+def add_time():
+    """Add current time every 2 seconds"""
+    print(datetime.datetime.now())
+    root.after(2000, add_time)
+
+# --- main ---
+
+root = tk.Tk()
+
+label = tk.Label(root)
+label.pack()
+
+# label can't be scrolled (it would need Canvas but it more complex)
+#button_top = tk.Button(root, text="Move to TOP", command=lambda:label.see('1.0'))
+#button_top.pack()
+
+# label can't be scrolled (it would need Canvas but it more complex)
+#button_end = tk.Button(root, text="Move to END", command=lambda:label.see('end'))
+#button_end.pack()
+
+# keep original `stdout` and assing `RedirectText` as `stdout`
+old_stdout = sys.stdout
+sys.stdout = RedirectLabel(label)
+
+# add some datetime at the beginning 
+print('--- TOP ---')
+for _ in range(5):
+    print(datetime.datetime.now())
+    
+# add new datetime every 2 seconds
+add_time()
+                   
+# write to console when `print()` is redirected to `RedirectText()`
+old_stdout.write('Hello World!\n')      # need '\n'
+print('Hello World!', file=old_stdout)  # no need '\n'
+                                    
+root.mainloop()    
+    
+# assign back original `stdout`    
+sys.stdout = old_stdout
+

tkinter/redirect-stdout-to-text-widget/main-Listbox.py

@@ -0,0 +1,68 @@
+#!/usr/bin/env python3
+
+# date: 2020.06.05
+# https://stackoverflow.com/questions/62217254/python-tkinter-make-text-widget-automatically-scroll-with-text-used-with-redir/
+
+import tkinter as tk
+import sys
+import datetime
+
+# --- classes ---
+
+class RedirectListbox(object):
+
+    def __init__(self, widget):
+        """Constructor"""
+        self.output = widget
+
+    def write(self, string):
+        """Add text to the end and scroll to the end"""
+        if string != '\n':   # skip '\n' added by `print()`
+            self.output.insert('end', string)
+            self.output.see('end')
+
+    # some widgets may need it if they don't have it
+    #def flush(self):
+    #    pass
+    
+# --- functions ---
+        
+def add_time():
+    """Add current time every 2 seconds"""
+    print(datetime.datetime.now())
+    root.after(2000, add_time)
+
+# --- main ---
+
+root = tk.Tk()
+
+listbox = tk.Listbox(root, width=25) # width in chars (to show full datetime)
+listbox.pack(fill='x')
+
+button_top = tk.Button(root, text="Move to TOP", command=lambda:listbox.see('0'))  # Listbox needs only `"0"`, Text needs `"1.0"`
+button_top.pack()
+
+button_end = tk.Button(root, text="Move to END", command=lambda:listbox.see('end'))
+button_end.pack()
+
+# keep original `stdout` and assing `RedirectText` as `stdout`
+old_stdout = sys.stdout
+sys.stdout = RedirectListbox(listbox)
+
+# add some datetime at the beginning 
+print('--- TOP ---')
+for _ in range(50):
+    print(datetime.datetime.now())
+    
+# add new datetime every 2 seconds
+add_time()
+                   
+# write to console when `print()` is redirected to `RedirectText()`
+old_stdout.write('Hello World!\n')      # need '\n'
+print('Hello World!', file=old_stdout)  # no need '\n'
+                                    
+root.mainloop()    
+    
+# assign back original `stdout`    
+sys.stdout = old_stdout
+

tkinter/redirect-stdout-to-text-widget/main-Text.py

@@ -0,0 +1,67 @@
+#!/usr/bin/env python3
+
+# date: 2020.06.05
+# https://stackoverflow.com/questions/62217254/python-tkinter-make-text-widget-automatically-scroll-with-text-used-with-redir/
+
+import tkinter as tk
+import sys
+import datetime
+
+# --- classes ---
+
+class RedirectText(object):
+
+    def __init__(self, widget):
+        """Constructor"""
+        self.output = widget
+
+    def write(self, string):
+        """Add text to the end and scroll to the end"""
+        self.output.insert('end', string)
+        self.output.see('end')
+
+    # some widgets may need it if they don't have it
+    #def flush(self):
+    #    pass
+    
+# --- functions ---
+        
+def add_time():
+    """Add current time every 2 seconds"""
+    print(datetime.datetime.now())
+    root.after(2000, add_time)
+
+# --- main ---
+
+root = tk.Tk()
+
+text = tk.Text(root)
+text.pack()
+
+button_top = tk.Button(root, text="Move to TOP", command=lambda:text.see('1.0'))
+button_top.pack()
+
+button_end = tk.Button(root, text="Move to END", command=lambda:text.see('end'))
+button_end.pack()
+
+# keep original `stdout` and assing `RedirectText` as `stdout`
+old_stdout = sys.stdout
+sys.stdout = RedirectText(text)
+
+# add some datetime at the beginning 
+print('--- TOP ---')
+for _ in range(50):
+    print(datetime.datetime.now())
+    
+# add new datetime every 2 seconds
+add_time()
+                   
+# write to console when `print()` is redirected to `RedirectText()`
+old_stdout.write('Hello World!\n')      # need '\n'
+print('Hello World!', file=old_stdout)  # no need '\n'
+                                    
+root.mainloop()    
+    
+# assign back original `stdout`    
+sys.stdout = old_stdout
+

tkinter/redirect-stdout-to-text-widget/main.py

@@ -1,32 +1,46 @@
+#!/usr/bin/env python3
+
 import tkinter as tk
 import sys
 
+# date: 2019.10.22
+
+# --- classes ---
+
 class Redirect():
+
     def __init__(self, output):
         self.output = output
 
     def write(self, text):
-        self.output.insert('end', text + '\n')
+        self.output.insert('end', text)
+        #self.output.see('end')
 
     def flush(self):
         pass
 
+# --- main ---
 
 root = tk.Tk()
-root.title('Output')
 
 text_output = tk.Text(root)
-text_output.pack(fill='both', expand=True)
+text_output.pack()
 
+# keep original `stdout` and assing class `Redirect`
 old_stdout = sys.stdout
-sys.stdout = Redirect(text_output)
+redirect = Redirect(text_output)
+#sys.stdout = redirect
 
-print("Text")
+# write some text to new output
+for x in range(100):
+    print("Line:", x, file=redirect)
 
-button = tk.Button(root, text='OK', command=root.destroy)
-button.pack()
+# write to console 
+#old_stdout.write('Hello World!\n')
+#print('Hello World!', file=old_stdout)
 
 root.mainloop()
 
+# assign back original `stdout` 
 sys.stdout = old_stdout
-print('koniec')
+