tkinter

Author: furas

tkinter/__BIND__/mouse-wheel/main.py

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+import tkinter as tk
+
+# --- functions ---
+
+def mouse_wheel(event):
+    global number
+    
+    # respond to Linux or Windows wheel event
+    if event.num == 5 or event.delta == -120:
+        number -= 1
+    if event.num == 4 or event.delta == 120:
+        number += 1
+        
+    label['text'] = number
+
+# --- main ---
+
+number = 0
+
+root = tk.Tk()
+
+label = tk.Label(root, text="0")
+label.pack(ipadx=15, ipady=5)
+
+# Windows
+root.bind("<MouseWheel>", mouse_wheel)
+# Linux
+root.bind("<Button-4>", mouse_wheel)
+root.bind("<Button-5>", mouse_wheel)
+
+root.mainloop()

tkinter/__canvas__/canvas-move-vertically-horizontally-with-Shift-Control/main-2.py

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+#!/usr/bin/env python3
+
+import tkinter as tk
+
+# --- functions ---
+
+def move(diff_x, diff_y):
+    global centerx
+    global centery
+    
+    for item in items:
+        canvas.move(item, diff_x, diff_y)
+
+    centerx += diff_x
+    centery += diff_y
+
+    for item in lines:
+        x1, y1, x2, y2 = canvas.coords(item)
+        canvas.coords(item, x1, y1, centerx, centery)
+
+def move_item(event):
+    global old_x
+    global old_y
+    diff_x = event.x - old_x
+    diff_y = event.y - old_y
+    move(diff_x, diff_y)
+    old_x = event.x
+    old_y = event.y
+        
+def move_horizontal(event):
+    global old_x
+    diff_x = event.x - old_x
+    move(diff_x, 0)
+    old_x = event.x
+
+def move_vertical(event):
+    global old_y
+    diff_y = event.y - old_y
+    move(0, diff_y)
+    old_y = event.y
+
+def save_position(event):
+    global old_x
+    global old_y    
+    old_x = event.x
+    old_y = event.y
+    
+def create_objects(event=None):
+    global centerx
+    global centery
+    global lines
+    global items
+    
+    w = canvas.winfo_width()
+    h = canvas.winfo_height()
+    centerx = w//2
+    centery = h//2
+    
+    lines = [
+        canvas.create_line(0, 0, centerx, centery),
+        canvas.create_line(0, h, centerx, centery),
+        canvas.create_line(w, 0, centerx, centery),
+        canvas.create_line(w, h, centerx, centery),
+    ]
+
+    # create objects
+    items = [
+        canvas.create_rectangle(centerx-50, centery-50, centerx-100, centery-100, fill='red'),
+        canvas.create_rectangle(centerx-50, centery+50, centerx-100, centery+100, fill='blue'),
+        canvas.create_rectangle(centerx+50, centery-50, centerx+100, centery-100, fill='yellow'),
+        canvas.create_rectangle(centerx+50, centery+50, centerx+100, centery+100, fill='green'),
+    ]
+    
+        
+# --- main ---
+
+old_x = 0
+old_y = 0
+
+root = tk.Tk()
+
+
+canvas = tk.Canvas(root, width=500, height=300, bg='gray')
+canvas.pack(fill='both', expand=True)
+
+canvas.bind("<Button-1>", save_position)
+canvas.bind("<B1-Motion>", move_item)
+canvas.bind("<Shift-B1-Motion>", move_horizontal)
+canvas.bind("<Control-B1-Motion>", move_vertical)
+
+root.after(100, create_objects) # run later so `tkinter` will already know window size
+
+root.mainloop()

tkinter/__canvas__/canvas-move-vertically-horizontally-with-Shift-Control/main.py

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+#!/usr/bin/env python3
+
+import tkinter as tk
+
+# --- functions ---
+
+def move_item(event):
+    global old_x
+    global old_y    
+    diff_x = event.x - old_x
+    diff_y = event.y - old_y
+    for item in items:
+        canvas.move(item, diff_x, diff_y)
+    old_x = event.x
+    old_y = event.y
+
+def move_horizontal(event):
+    global old_x
+    diff_x = event.x - old_x
+    for item in items:
+        canvas.move(item, diff_x, 0)
+    old_x = event.x
+
+def move_vertical(event):
+    global old_y
+    diff_y = event.y - old_y
+    for item in items:
+        canvas.move(item, 0, diff_y)
+    old_y = event.y
+
+def save_position(event):
+    global old_x
+    global old_y    
+    old_x = event.x
+    old_y = event.y
+    
+# --- main ---
+
+old_x = 0
+old_y = 0
+# init
+root = tk.Tk()
+
+# create canvas
+canvas = tk.Canvas(root, width=500, height=300)
+canvas.pack()
+
+# create objects
+items = [
+    canvas.create_rectangle(100, 100, 130, 130, fill='red'),
+    canvas.create_rectangle(200, 100, 230, 130, fill='blue'),
+    canvas.create_rectangle(100, 200, 130, 230, fill='yellow'),
+]
+
+canvas.bind("<Button-1>", save_position)
+canvas.bind("<B1-Motion>", move_item)
+canvas.bind("<Shift-B1-Motion>", move_horizontal)
+canvas.bind("<Control-B1-Motion>", move_vertical)
+# start program
+root.mainloop()
+

tkinter/timer-using-after/minimal-example.py

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+#!/usr/bin/env python3
+
+# date: 2020.01.14
+
+import tkinter as tk
+import time
+
+# --- functions ---
+
+def update_time():
+    label['text'] = time.strftime('%Y.%m.%d  %H:%M:%S')
+
+    # run update_time again after 1000ms (1s)
+    root.after(1000, update_time)
+
+# --- main ---
+
+root = tk.Tk()
+
+label = tk.Label(root)
+label.pack()
+
+# run update_time first time
+update_time()
+
+root.mainloop()