python - 如何让 tkinter Canvas 动态调整为窗口宽度？

Question

我需要在 tkinter 中获取一个 Canvas 以将其宽度设置为窗口的宽度，然后在用户使窗口变小/变大时动态地重新调整 Canvas 的大小。

有没有办法(轻松)做到这一点？

Answer 1

我想我会添加一些额外的代码来扩展 @fredtantini's answer ，因为它不处理如何更新在 Canvas 上绘制的小部件的形状。

为此，您需要使用 scale 方法并标记所有小部件。下面是一个完整的例子。

from Tkinter import *

# a subclass of Canvas for dealing with resizing of windows
class ResizingCanvas(Canvas):
    def __init__(self,parent,**kwargs):
        Canvas.__init__(self,parent,**kwargs)
        self.bind("<Configure>", self.on_resize)
        self.height = self.winfo_reqheight()
        self.width = self.winfo_reqwidth()

    def on_resize(self,event):
        # determine the ratio of old width/height to new width/height
        wscale = float(event.width)/self.width
        hscale = float(event.height)/self.height
        self.width = event.width
        self.height = event.height
        # resize the canvas 
        self.config(width=self.width, height=self.height)
        # rescale all the objects tagged with the "all" tag
        self.scale("all",0,0,wscale,hscale)

def main():
    root = Tk()
    myframe = Frame(root)
    myframe.pack(fill=BOTH, expand=YES)
    mycanvas = ResizingCanvas(myframe,width=850, height=400, bg="red", highlightthickness=0)
    mycanvas.pack(fill=BOTH, expand=YES)

    # add some widgets to the canvas
    mycanvas.create_line(0, 0, 200, 100)
    mycanvas.create_line(0, 100, 200, 0, fill="red", dash=(4, 4))
    mycanvas.create_rectangle(50, 25, 150, 75, fill="blue")

    # tag all of the drawn widgets
    mycanvas.addtag_all("all")
    root.mainloop()

if __name__ == "__main__":
    main()