canvas具有通过
scan_mark和
scan_dragto方法使用鼠标滚动的内置支持。前者会记住您单击鼠标的位置，而后者会在窗口中滚动适当数量的像素。
注意：该
gain属性告诉您
scan_moveto鼠标移动每个像素要移动多少像素。默认情况下为10，因此如果要在光标和画布之间建立1：1的关联，则需要将此值设置为1（如示例中所示）。
这是一个例子：
import Tkinter as tkimport randomclass Example(tk.frame): def __init__(self, root): tk.frame.__init__(self, root) self.canvas = tk.Canvas(self, width=400, height=400, background="bisque") self.xsb = tk.Scrollbar(self, orient="horizontal", command=self.canvas.xview) self.ysb = tk.Scrollbar(self, orient="vertical", command=self.canvas.yview) self.canvas.configure(yscrollcommand=self.ysb.set, xscrollcommand=self.xsb.set) self.canvas.configure(scrollregion=(0,0,1000,1000)) self.xsb.grid(row=1, column=0, sticky="ew") self.ysb.grid(row=0, column=1, sticky="ns") self.canvas.grid(row=0, column=0, sticky="nsew") self.grid_rowconfigure(0, weight=1) self.grid_columnconfigure(0, weight=1) for n in range(50): x0 = random.randint(0, 900) y0 = random.randint(50, 900) x1 = x0 + random.randint(50, 100) y1 = y0 + random.randint(50,100) color = ("red", "orange", "yellow", "green", "blue")[random.randint(0,4)] self.canvas.create_rectangle(x0,y0,x1,y1, outline="black", fill=color) self.canvas.create_text(50,10, anchor="nw",text="Click and drag to move the canvas") # This is what enables scrolling with the mouse: self.canvas.bind("<ButtonPress-1>", self.scroll_start) self.canvas.bind("<B1-Motion>", self.scroll_move) def scroll_start(self, event): self.canvas.scan_mark(event.x, event.y) def scroll_move(self, event): self.canvas.scan_dragto(event.x, event.y, gain=1)if __name__ == "__main__": root = tk.Tk() Example(root).pack(fill="both", expand=True) root.mainloop()
