Welcome, guest | Sign In | My Account | Store | Cart
# Version: 0.9
# Author: Miguel Martinez Lopez
# Uncomment the next line to see my email
# print ("Author's email: %s"% "61706c69636163696f6e616d656469646140676d61696c2e636f6d".decode("hex"))

import platform

OS = platform.system()

def build_mouse_wheel_handler(widget, orient, factor = 1, what="units"):
    view_command = getattr(widget, orient+'view')
    
    if OS == 'Linux':
        def onMouseWheel(event):
            if event.num == 4:
                view_command("scroll",(-1)*factor, what)
            elif event.num == 5:
                view_command("scroll",factor, what) 
            
    elif OS == 'Windows':
        def onMouseWheel(event):        
            view_command("scroll",(-1)*int((event.delta/120)*factor), what) 
    
    elif OS == 'Darwin':
        def onMouseWheel(event):        
            view_command("scroll",event.delta, what)
    
    return onMouseWheel

class Mousewheel_Support(object):    

    # implemetnation of singleton pattern
    _instance = None
    def __new__(cls, *args, **kwargs):
        if not cls._instance:
            cls._instance = super(Mousewheel_Support, cls).__new__(cls, *args, **kwargs)
        return cls._instance

    def __init__(self, root, horizontal_factor = 2, vertical_factor=2):
        
        self._active_area = None
        
        if isinstance(horizontal_factor, int):
            self.horizontal_factor = horizontal_factor
        else:
            raise Exception("Vertical factor must be an integer.")

        if isinstance(vertical_factor, int):
            self.vertical_factor = vertical_factor
        else:
            raise Exception("Horizontal factor must be an integer.")

        if OS == "Linux" :
            root.bind_all('<4>', self._on_mouse_wheel,  add='+')
            root.bind_all('<5>', self._on_mouse_wheel,  add='+')
        else:
            # Windows and MacOS
            root.bind_all("<MouseWheel>", self._on_mouse_wheel,  add='+')

    def _on_mouse_wheel(self,event):
        if self._active_area:
            self._active_area.onMouseWheel(event)

    def _on_mouse_enter_scrolling_area(self, widget):
        self._active_area = widget

    def _on_mouse_leave_scrolling_area(self):
        self._active_area = None

    def add_support_to(self, widget, xscrollbar=None, yscrollbar=None, what="units", horizontal_factor=None, vertical_factor=None):
        if xscrollbar is not None and not hasattr(xscrollbar, 'onMouseWheel'):
            horizontal_factor = horizontal_factor or self.horizontal_factor

            xscrollbar.onMouseWheel = build_mouse_wheel_handler(widget,'x', self.horizontal_factor, what)
            xscrollbar.bind('<Enter>', lambda event, scrollbar=xscrollbar: self._on_mouse_enter_scrolling_area(scrollbar) )
            xscrollbar.bind('<Leave>', lambda event: self._on_mouse_leave_scrolling_area())

        if yscrollbar is not None and not hasattr(yscrollbar, 'onMouseWheel'):
            vertical_factor = vertical_factor or self.vertical_factor

            yscrollbar.onMouseWheel = build_mouse_wheel_handler(widget,'y', self.vertical_factor, what)
            yscrollbar.bind('<Enter>', lambda event, scrollbar=yscrollbar: self._on_mouse_enter_scrolling_area(scrollbar) )
            yscrollbar.bind('<Leave>', lambda event: self._on_mouse_leave_scrolling_area())

        main_scrollbar = yscrollbar if yscrollbar is not None else xscrollbar
        
        if main_scrollbar is not None:
            widget.bind('<Enter>',lambda event: self._on_mouse_enter_scrolling_area(widget))
            widget.bind('<Leave>', lambda event: self._on_mouse_leave_scrolling_area())

            widget.onMouseWheel = main_scrollbar.onMouseWheel

if __name__== '__main__':
    try:
        from Tkinter import Tk, Scrollbar, Text
        from Tkconstants import *
    except ImportError:
        from tkinter import Tk, Scrollbar, Text
        from tkinter.constants import *

    root = Tk()
    
    lorem_ipsum = """Lorem ipsum dolor sit amet, consectetuer adipiscing elit. Aenean commodo ligula eget dolor. Aenean massa. Cum sociis natoque penatibus et magnis dis parturient montes, nascetur ridiculus mus. Donec quam felis, ultricies nec, pellentesque eu, pretium quis, sem. Nulla consequat massa quis enim. Donec pede justo, fringilla vel, aliquet nec, vulputate eget, arcu. In enim justo, rhoncus ut, imperdiet a, venenatis vitae, justo. Nullam dictum felis eu pede mollis pretium. Integer tincidunt. Cras dapibus. Vivamus elementum semper nisi. Aenean vulputate eleifend tellus. Aenean leo ligula, porttitor eu, consequat vitae, eleifend ac, enim. Aliquam lorem ante, dapibus in, viverra quis, feugiat a, tellus. Phasellus viverra nulla ut metus varius laoreet. """

    xscrollbar = Scrollbar(root, orient=HORIZONTAL)
    xscrollbar.pack(side=BOTTOM, fill=X)

    yscrollbar = Scrollbar(root)
    yscrollbar.pack(side=RIGHT, fill=Y)

    textarea = Text(root, wrap="none", height=20, width=27,
                xscrollcommand=xscrollbar.set,
                yscrollcommand=yscrollbar.set)
    textarea.pack()
    
    textarea.insert(1.0, "\n\n".join(lorem_ipsum.split(".")))
    
    textarea.configure(yscrollcommand=yscrollbar.set)
    yscrollbar['command']=textarea.yview

    textarea.configure(xscrollcommand=xscrollbar.set)
    xscrollbar['command']=textarea.xview

    mousewheel_support = Mousewheel_Support(root)
    mousewheel_support.add_support_to(textarea, xscrollbar=xscrollbar, yscrollbar=yscrollbar, what="pages")

    root.mainloop()

Diff to Previous Revision

--- revision 22 2017-04-17 20:16:04
+++ revision 23 2017-04-17 20:20:38
@@ -1,18 +1,7 @@
-# Version: 0.11
+# Version: 0.9
 # Author: Miguel Martinez Lopez
 # Uncomment the next line to see my email
-# print("Author's email: ", "61706c69636163696f6e616d656469646140676d61696c2e636f6d".decode("hex"))
-
-try:
-    from Tkinter import Canvas, Frame
-    from ttk import Scrollbar
-    
-    from Tkconstants import *
-except ImportError:
-    from tkinter import Canvas, Frame
-    from tkinter.ttk import Scrollbar
-    
-    from tkinter.constants import *
+# print ("Author's email: %s"% "61706c69636163696f6e616d656469646140676d61696c2e636f6d".decode("hex"))
 
 import platform
 
@@ -101,69 +90,38 @@
 
             widget.onMouseWheel = main_scrollbar.onMouseWheel
 
-class Scrolling_Area(Frame):
-
-    def __init__(self, master, mousewheel_speed = 2, scroll_horizontally=True, scroll_vertically=True, outer_background=None, inner_frame=Frame, **kw):
-        Frame.__init__(self, master)
-        
-        if outer_background:
-            self.configure(background=outer_background)
-
-        self._canvas = Canvas(self, highlightthickness=0)
-        self._canvas.grid(row=0, column=0, sticky="nsew")
-
-        if scroll_vertically:
-            self.yscrollbar = Scrollbar(self, orient=VERTICAL)
-            self.yscrollbar.grid(row=0, column=1,sticky=N+S)
-        
-            self._canvas.configure(yscrollcommand=self.yscrollbar.set)
-            self.yscrollbar['command']=self._canvas.yview
-        else:
-            self.yscrollbar = None
-
-        if scroll_horizontally:
-            self.xscrollbar = Scrollbar(self, orient=HORIZONTAL)
-            self.xscrollbar.grid(row=1, column=0, sticky=E+W)
-            
-            self._canvas.configure(xscrollcommand=self.xscrollbar.set)
-            self.xscrollbar['command']=self._canvas.xview
-        else:
-            self.xscrollbar = None
-
-        self.rowconfigure( 0, weight=1)
-        self.columnconfigure(0, weight=1)
-
-        self.innerFrame= inner_frame(self._canvas, **kw)
-        self.innerFrame.pack()
-        
-        self._canvas.create_window(0, 0, window=self.innerFrame, anchor='nw', tags="inner_frame")
-                    
-        self._canvas.bind('<Configure>', self._on_configure_canvas)
-
-        Mousewheel_Support(self).add_support_to(self._canvas, xscrollbar=self.xscrollbar, yscrollbar=self.yscrollbar)
-
-    def _on_configure_canvas(self, event):
-        width = max(self.innerFrame.winfo_reqwidth(), event.width)
-        height = max(self.innerFrame.winfo_reqheight(), event.height)
-        
-        self._canvas.configure(scrollregion="0 0 %s %s" % (width, height))        
-        self._canvas.itemconfigure("inner_frame", width=width, height=height)
-
 if __name__== '__main__':
     try:
-        from Tkinter import Tk, Label
+        from Tkinter import Tk, Scrollbar, Text
+        from Tkconstants import *
     except ImportError:
-        from tkinter import Tk, Label
-    
+        from tkinter import Tk, Scrollbar, Text
+        from tkinter.constants import *
+
     root = Tk()
     
-    scrolling_area = Scrolling_Area(root)
-    scrolling_area.pack(expand=1, fill=BOTH)
+    lorem_ipsum = """Lorem ipsum dolor sit amet, consectetuer adipiscing elit. Aenean commodo ligula eget dolor. Aenean massa. Cum sociis natoque penatibus et magnis dis parturient montes, nascetur ridiculus mus. Donec quam felis, ultricies nec, pellentesque eu, pretium quis, sem. Nulla consequat massa quis enim. Donec pede justo, fringilla vel, aliquet nec, vulputate eget, arcu. In enim justo, rhoncus ut, imperdiet a, venenatis vitae, justo. Nullam dictum felis eu pede mollis pretium. Integer tincidunt. Cras dapibus. Vivamus elementum semper nisi. Aenean vulputate eleifend tellus. Aenean leo ligula, porttitor eu, consequat vitae, eleifend ac, enim. Aliquam lorem ante, dapibus in, viverra quis, feugiat a, tellus. Phasellus viverra nulla ut metus varius laoreet. """
+
+    xscrollbar = Scrollbar(root, orient=HORIZONTAL)
+    xscrollbar.pack(side=BOTTOM, fill=X)
+
+    yscrollbar = Scrollbar(root)
+    yscrollbar.pack(side=RIGHT, fill=Y)
+
+    textarea = Text(root, wrap="none", height=20, width=27,
+                xscrollcommand=xscrollbar.set,
+                yscrollcommand=yscrollbar.set)
+    textarea.pack()
     
-    for i in range(20):
-        rowFrame = Frame(scrolling_area.innerFrame)
-        rowFrame.pack()
-        for j in range(8):
-            Label(rowFrame, text="Label %s, %s" % (str(i), str(j))).pack(side="left")
+    textarea.insert(1.0, "\n\n".join(lorem_ipsum.split(".")))
+    
+    textarea.configure(yscrollcommand=yscrollbar.set)
+    yscrollbar['command']=textarea.yview
+
+    textarea.configure(xscrollcommand=xscrollbar.set)
+    xscrollbar['command']=textarea.xview
+
+    mousewheel_support = Mousewheel_Support(root)
+    mousewheel_support.add_support_to(textarea, xscrollbar=xscrollbar, yscrollbar=yscrollbar, what="pages")
 
     root.mainloop()

History