Python/ttk/tKinter - 使用按钮单击功能传递参数? [英] Python/ttk/tKinter - passing an argument with a button click func?

问题描述

我正在尝试将参数传递给按钮单击功能并遇到问题.

I'm trying to pass an argument to a button click func and encountering an issues.

简而言之，我试图按下按钮来弹出 askColor() 方法，并将该颜色值作为相关文本框的背景颜色返回.

In short, I am trying to get a button press to pop up out the askColor() method, and return that colour value as the background colour of the related textbox.

它的功能是联觉可以将颜色与字母/数字相关联，并记录生成的颜色列表.

Its function is so synaesthets can associate a colour with a letter/number and record the resulting colour list.

具体行:

    self.boxA = Text(self.mainframe, state='normal', width=3, height=1, wrap='word', background=self.AVal).grid(column=2, row=2, padx=4)
    self.boxB = Text(self.mainframe, state='normal', width=3, height=1, wrap='word', background=self.AVal).grid(column=3, row=2, padx=4)
    self.boxC = Text(self.mainframe, state='normal', width=3, height=1, wrap='word', background=self.AVal).grid(column=4, row=2, padx=4)

    self.ABlob = ttk.Button(self.mainframe, text="A",style= 'mainSmall.TButton', command= lambda: self.getColour(self.boxA)).grid(column=2, row=3)
    self.BBlob = ttk.Button(self.mainframe, text="B",style= 'mainSmall.TButton', command= lambda: self.getColour(self.boxB)).grid(column=3, row=3)
    self.CBlob = ttk.Button(self.mainframe, text="C",style= 'mainSmall.TButton', command= lambda: self.getColour(self.boxC)).grid(column=4, row=3)

和:

def getColour(self,glyphRef):
    (triple, hexstr) = askcolor()
    if hexstr:
            glyphRef.config(bg=hexstr)

问题是我似乎无法以我尝试的方式引用 self.ABlob - 它返回类型 None.我尝试在按钮单击功能中包含 pack.forget 命令，但这也不起作用.

The problem is that I can't seem to reference self.ABlob in the way I am trying - it returns type None. I have tried including a pack.forget command in the button click func, but that also doesn't work.

推荐答案

你的问题的主要部分似乎是:

The main part of your question seems to be:

问题是我似乎无法像我一样引用 self.ABlob我正在尝试 - 它返回类型 None

The problem is that I can't seem to reference self.ABlob in the way I am trying - it returns type None

当你执行 x=ClassA(...).func(...) 时，x 包含调用 func 的结果.因此，当您执行 self.ABlob = ttk.Button(...).grid(...) 时，self.ABlob 中存储的是 无，因为这是网格函数返回的内容.

When you do x=ClassA(...).func(...), x contains the result of the call to func. Thus, when you do self.ABlob = ttk.Button(...).grid(...), what is stored in self.ABlob is None, because that is what is returned by the grid function.

如果要存储对按钮的引用，则需要创建按钮，然后以两个单独的步骤调用 grid:

If you want to store a reference to the button you will need to create the button and then call grid as two separate steps:

self.ABlob = ttk.Button(...)
self.ABlob.grid(...)

我个人认为这是最佳实践，尤其是当您使用网格时.通过将所有网格语句放在一个块中，可以更轻松地可视化布局和发现错误:

Personally I see this as a best practice, especially when you're using grid. By putting all of your grid statements in a block it becomes easier to visualize the layout and spot bugs:

self.ABlob.grid(row=3, column=2)
self.BBlob.grid(row=3, column=3)
self.CBlob.grid(row=3, column=4)

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