Question

我目前正在努力在滚动框架中使用Tkinter画布。通过滚动框架，我的意思是由Gonzo给另一个线程（Python Tkinter scrollbar for frame）的答案中给出的Frame-Canvas结构。我已经改编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。在该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（以及框架）的大小调整为小于画布的值（这是滚动条应该有用的条件），则画布不会被拉伸到所需的大小（在下面的示例中，而不是宽度= 500px）而是在帧的较小尺寸（宽度= 400px）处被截断。滚动条处于活动状态，它们滚动内部框架，仍然是500px。

下面我将为您提供有关代码和问题的更多详细信息。

感谢您对此进行调查。我很欣赏这个问题的任何帮助，也许我只是做了一些明显错误的事情。

干杯，下进行。

ScrollFrame类（存储在scrollframe.py中）：

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)

主要代码：来自Tkinter进口* 来自scrollframe import *

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

问题：绿色画布应该是请求的尺寸（500/400），但它似乎是滚动条连接到（400/300）而不是内部框架的祖母框架的大小，这是一个滚动（500/400），它是画布的母框。

Answer 1

_configure_canvas方法是您的问题的根源。它将self.interior框的大小调整为self.canvas的宽度，并且canvas已填充选项expand=True, fill=BOTH，其大小调整为400x300。

此外，此功能不是获取滚动框架所必需的，唯一需要的是每次self.canvas调整大小时调整self.interior scrollregion的大小。

以下是修改后的代码：

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()

滚动框内的画布

1 个答案: