Question

我有画布。画布内部是一个框架。在那个框架里面是一个标签。随着标签中文本的增长，画布的大小也会增加。我已经设置了一个垂直滚动条，允许我查看溢出窗口大小的文本。滚动条按预期工作，但我希望它随着文本的增长自动滚动到底部（即保持锁定到底部）。我怎么能这样做？

使用canvas.yview_moveto( 1 )无效......

以下是我的代码：

def tk_onFrameConfigure( self, event ):

    # resize canvas
    self.tkCanvas.configure( scrollregion = self.tkCanvas.bbox( 'all' ) )

def tk_onCanvasConfigure( self, event ):

    # resize frame
    self.tkCanvas.itemconfigure( self.tkCanvasFrame, width = event.width )

def setupTkinter( self ):

    self.tkRoot = tkinter.Tk()

    self.tkCanvas = tkinter.Canvas( self.tkRoot )
    self.tkCanvas.pack( side = tkinter.LEFT, expand = True, fill = 'both' )
    self.tkCanvas.configure(

        width = self.width,
        height = self.height,
        highlightthickness = 0,
        bg = self.bgColor
    )

    scrollbar = tkinter.Scrollbar( self.tkRoot )
    scrollbar.pack( side = tkinter.RIGHT, fill = 'y' )
    scrollbar.configure(

        orient = 'vertical',
        command = self.tkCanvas.yview
    )
    self.tkCanvas.configure( yscrollcommand = scrollbar.set )
    # self.tkCanvas.yview_moveto( 1 )  # does nothing

    frame = tkinter.Frame( self.tkCanvas )
    self.tkCanvasFrame = self.tkCanvas.create_window(

        ( 0, 0 ),
        window = frame,
        anchor = 'nw'
    )

    self.tkTextBox = tkinter.Label( frame )
    self.tkTextBox.pack( expand = True, fill = 'both' )
    self.tkTextBox[ 'text' ] = self.displayBuffer
    self.tkTextBox.config(

        fg = self.textColor,
        bg = self.bgColor,
        anchor = 'nw',
        justify = tkinter.LEFT,
        wraplength = self.width - 5
    )

    frame.bind( '<Configure>', self.tk_onFrameConfigure )
    self.tkCanvas.bind( '<Configure>', self.tk_onCanvasConfigure )

    self.tkRoot.mainloop()

Answer 1

我找到了解决方案here。 canvas.yview_moveto( 1 )似乎无所事事，因为我在安装过程中只调用了一次。为了使“自动”滚动起作用，我需要在每次文本增长时调用它。

Tkinter - 自动滚动到底部

1 个答案: