Google: search for websites containing exactly the given word or pharase

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Python 3 and tkinter: scroll canvas with mouse wheel and drag it around with middle mouse button

This is an example in Python 3.4 running in 64-bit Ubuntu 14.04 of a canvas that can be scrolled with mouse wheel and dragged around with middle mouse button. Hope this example will be useful to you.

	'''
	Example of canvas with that can be scrolled with mouse and
	dragged around with middle mouse of the button.
	Written and tested using Python 3.4 on Ubuntu x64 14.04
	'''
	from tkinter import *
	class MyCanvas(Canvas):
	def __init__(self, parent=None, img=None, *parms, **kparms):
	Canvas.__init__(self, parent, *parms, **kparms)
	self._width = 1000;
	self._height = 1000;
	self._starting_drag_position = ()
	self.config(width = self._width, height=self._height, bg='green')
	self._draw_some_example_objects()
	self._add_scrollbars()
	self._addMouseBindings()
	self.pack(fill=BOTH, expand=YES)
	def _add_scrollbars(self):
	self.sbarV = Scrollbar(self.master, orient=VERTICAL)
	self.sbarH = Scrollbar(self.master, orient=HORIZONTAL)
	self.sbarV.config(command=self.yview)
	self.sbarH.config(command=self.xview)
	self.config(yscrollcommand=self.sbarV.set)
	self.config(xscrollcommand=self.sbarH.set)
	self.sbarV.pack(side=RIGHT, fill=Y)
	self.sbarH.pack(side=BOTTOM, fill=X)
	def _addMouseBindings(self):
	# mouse wheel scroll
	self.bind('<4>', lambda event : self.yview('scroll', -1, 'units'))
	self.bind('<5>', lambda event : self.yview('scroll', 1, 'units'))
	# dragging canvas with mouse middle button
	self.bind("<Button-2>", self.__start_scroll)
	self.bind("<B2-Motion>", self.__update_scroll)
	self.bind("<ButtonRelease-2>", self.__stop_scroll)
	def __start_scroll(self, event):
	# set the scrolling increment.
	# value of 0 is unlimited and very fast
	# set it to 1,2,3 or whatever to make it slower
	self.config(yscrollincrement=3)
	self.config(xscrollincrement=3)
	self._starting_drag_position = (event.x, event.y)
	self.config(cursor="fleur")
	def __update_scroll(self, event):
	deltaX = event.x - self._starting_drag_position[0]
	deltaY = event.y - self._starting_drag_position[1]
	self.xview('scroll', deltaX, 'units')
	self.yview('scroll', deltaY, 'units')
	self._starting_drag_position = (event.x, event.y)
	def __stop_scroll(self, event):
	# set scrolling speed back to 0, so that mouse scrolling
	# works as expected.
	self.config(xscrollincrement=0)
	self.config(yscrollincrement=0)
	self.config(cursor="")
	def _draw_some_example_objects(self):
	colors = dict(outline="black")
	self.config(scrollregion=(0,0, self._width, self._height))
	self.create_rectangle(30, 10, 120, 120, fill="red", **colors)
	self.create_rectangle(330, 410, 420, 460, fill="blue", **colors)
	self.create_rectangle(830, 810, 920, 960, fill="yellow", **colors)
	self.create_rectangle(830, 210, 990, 500, fill="cyan", **colors)
	self.create_rectangle(130, 810, 290, 999, fill="gray", **colors)
	class MyGUI(Tk):
	def __init__(self, *args, **kwargs):
	Tk.__init__(self, *args, **kwargs)
	self.title("Drag canvas with mouse")
	self.geometry("500x500")
	self._addWidgets()
	def _addWidgets(self):
	my_canvas = MyCanvas(self)
	if __name__ == '__main__':
	MyGUI().mainloop()

view raw example_canvas.py hosted with ❤ by GitHub