2017-08-08 133 views
1

我目前正在挣扎使用滚动框架内的Tkinter画布。通过滚动框架,我的意思是Gonzo给另一个线程(Python Tkinter scrollbar for frame)给出的框架 - 画布结构。我已经适应了这个概念并添加了水平滚动条。现在,在内部框架的顶部,我想放置一个具有给定最小尺寸的画布。在这个最小尺寸小于内部框架(或整个窗口)的情况下,没有问题(因为不需要滚动)。但是,如果我将窗口大小调整为小于画布的值(这是滚动条应该有用的条件),则画布不会被缩小到所需的大小(在下面的示例中,不是宽度= 500px),而是在帧的较小尺寸(宽度= 400px)时被截断。滚动条处于活动状态,滚动仍处于500px的内部框架。滚动框架内的画布

下面我给你一些关于代码和问题的更多细节。

谢谢你的关注。我很感谢这个问题的任何帮助,也许我只是在做一些明显错误的事情。

干杯, C.

ScrollFrame类(存储在scrollframe.py):

from Tkinter import * 

class ScrollFrame(Frame): 
    def __init__(self, parent, yscroll=True, xscroll=True, *args, **kw): 
     Frame.__init__(self, parent, *args, **kw) 
     self.canvas = Canvas(self, bd=0, highlightthickness=0) 
     if xscroll: 
      hscrollbar = Scrollbar(self, orient=HORIZONTAL) 
      hscrollbar.pack(fill=X, side=BOTTOM, expand=FALSE) 
      self.canvas.config(xscrollcommand=hscrollbar.set) 
      hscrollbar.config(command=self.canvas.xview) 
     if yscroll: 
      vscrollbar = Scrollbar(self, orient=VERTICAL) 
      vscrollbar.pack(fill=Y, side=RIGHT, expand=FALSE) 
      self.canvas.config(yscrollcommand=vscrollbar.set) 
      vscrollbar.config(command=self.canvas.yview) 
     self.canvas.pack(side=LEFT, fill=BOTH, expand=TRUE) 

     # reset the view 
     self.canvas.xview_moveto(0) 
     self.canvas.yview_moveto(0) 

     # create a frame inside the canvas which will be scrolled with it 
     self.interior = interior = Frame(self.canvas, bg="blue") 
     self.interior_id = self.canvas.create_window(0, 0, window=interior, anchor=NW) 

     # track changes to the canvas and frame width and sync them, 
     # also updating the scrollbar 
     def _configure_interior(event): 
      # update the scrollbars to match the size of the inner frame 
      size = (interior.winfo_reqwidth(), interior.winfo_reqheight()) 
      print "interior req: ",size,(interior.winfo_width(),interior.winfo_height()) 
      self.canvas.config(scrollregion="0 0 %s %s" % size) 
      if interior.winfo_reqwidth() != self.canvas.winfo_width() or interior.winfo_reqheight() != sel f.canvas.winfo_height(): 
       # update the canvas's width to fit the inner frame 
       self.canvas.config(width=interior.winfo_reqwidth(), height=interior.winfo_reqheight(),) 
     interior.bind('<Configure>', _configure_interior) 

     def _configure_canvas(event): 
      if interior.winfo_reqwidth() != self.canvas.winfo_width() or interior.winfo_reqheight() != sel f.canvas.winfo_height(): 
       # update the inner frame's width to fill the canvas 
       self.canvas.itemconfigure(self.interior_id, width=self.canvas.winfo_width(), height=self.c anvas.winfo_height()) 
     self.canvas.bind('<Configure>', _configure_canvas) 

的主要代码: 从Tkinter的进口* 从scrollframe进口*

root = Tk() 
root.geometry("400x300") 

frame = Frame(root, bg="blue") 
frame.pack(expand=True, fill=BOTH) 

sf = ScrollFrame(frame, bg="yellow") 
sf.pack(expand=True, fill=BOTH) 

sf.interior.config(width=500, height=400) 
canvas = Canvas(sf.interior, width=500, height=400, bg="green") 
canvas.pack(expand=True, fill=BOTH, side="top") 

root.mainloop() 

运行时,看起来像这样: 1. canvas at top left corner (not yet scrolled) 2. canvas at bottom right corner (after scrolling)

问题:绿色帆布应该是所需的尺寸(500/400),但它似乎是滚动条连接到(400/300)而不是内部的祖母框架的尺寸框架,它是滚动的(500/400),它是画布的母框。

回答

1

_configure_canvas方法是问题的根源。它将self.interior框架的尺寸调整为self.canvas的宽度,并且因为canvas已经与选项expand=True, fill=BOTH一起打包,所以它被调整为400x300。

另外,这个函数对于获得一个滚动框不是必须的,唯一需要的是调整self.canvas滚动区域的大小,每次调整self.interior的大小。

这里是修改后的代码:

from Tkinter import * 

class ScrollFrame(Frame): 
    def __init__(self, parent, yscroll=True, xscroll=True, *args, **kw): 
     Frame.__init__(self, parent, *args, **kw) 
     self.canvas = Canvas(self, bd=0, highlightthickness=0) 
     if xscroll: 
      hscrollbar = Scrollbar(self, orient=HORIZONTAL) 
      hscrollbar.pack(fill=X, side=BOTTOM, expand=FALSE) 
      self.canvas.config(xscrollcommand=hscrollbar.set) 
      hscrollbar.config(command=self.canvas.xview) 
     if yscroll: 
      vscrollbar = Scrollbar(self, orient=VERTICAL) 
      vscrollbar.pack(fill=Y, side=RIGHT, expand=FALSE) 
      self.canvas.config(yscrollcommand=vscrollbar.set) 
      vscrollbar.config(command=self.canvas.yview) 
     self.canvas.pack(side=LEFT, fill=BOTH, expand=TRUE) 

     # reset the view 
     self.canvas.xview_moveto(0) 
     self.canvas.yview_moveto(0) 

     # create a frame inside the canvas which will be scrolled with it 
     self.interior = interior = Frame(self.canvas, bg="blue") 
     self.interior_id = self.canvas.create_window(0, 0, window=interior, anchor=NW) 

     # track changes to the frame width and update the scrollregion 
     def _configure_interior(event): 
      # update the scrollbars to match the size of the inner frame 
      self.canvas.config(scrollregion=self.canvas.bbox('all')) 
     interior.bind('<Configure>', _configure_interior) 

root = Tk() 
root.geometry("400x300") 

frame = Frame(root, bg="blue") 
frame.pack(expand=True, fill=BOTH) 

sf = ScrollFrame(frame, bg="yellow") 
sf.pack(expand=True, fill=BOTH) 

sf.interior.config(width=500, height=400) 
canvas = Canvas(sf.interior, width=500, height=400, bg="green") 
canvas.pack(expand=True, fill=BOTH, side="top") 

root.mainloop()