如何创建一个Tkinter的画布按钮？ [英] How do you create a Button on a tkinter Canvas?

问题描述

我创建了一个框架，然后一个Canvas。结果
我想接下来要做的就是在画布上添加一个按钮。结果
然而，当我收拾按钮，我不能看到画布！

下面是我的尝试：

 从Tkinter的进口TK，画布，框，按钮
从Tkinter的导入这两个，W，NW，凹陷，TOP，X，FLAT，LEFT类示例（帧）：
    高清__init __（自我，家长）​​：
        框架.__的init __（自我，父母）
        self.parent =父
        self.initUI（）    高清initUI（个体经营）：
        self.parent.title（布局测试）
        self.config（BG ='＃F0F0F0）
        self.pack（补= BOTH，扩大= 1）
                ＃创建帆布
        canvas1 =帆布（个体经营，减免= FLAT，背景=＃D2D2D2
                                            宽度= 180，高度= 500）
        canvas1.pack（边= TOP，锚= NW，padx = 10，pady = 10）
        ＃将退出按钮
        按钮1 =按钮（canvas1，文本=退出命令= self.quit，
                                                            锚= W）
        button1.configure（宽度= 10，activebackground =＃33B5E5，
                                                        救援= FLAT）
        button1.pack（侧= TOP）高清的main（）：
    根= TK（）
    root.geometry（'800×600 + 10 + 50'）
    应用实例=（根）
    app.mainloop（）如果__name__ =='__main__'：
    主要（）
 

解决方案

在Tkinter的包经理试图父控件调整到正确的尺寸，以遏制其子部件，和无大，默认情况下。所以帆布是有 - 但它precisely大小相同的按钮，并且因此不可见

。

如果你想放置在画布的一个小部件，而不的引起帆布带动态调整，你想要的 Canvas.create_window（）功能

 ＃...略...
按钮1 =按钮（个体经营，文本=退出命令= self.quit，锚= W）
button1.configure（宽= 10，activebackground =＃33B5E5，浮雕= FLAT）
button1_window = canvas1.create_window（10，10，锚= NW，窗口=按钮1）
 

这将在（10，10）相对于画布创建左上角的按钮，无需调整画布本身。

请注意，你可以与任何其他的Tkinter窗口部件的参考替换窗口参数。一个警告，虽然：命名部件必须是包含画布顶层窗口的孩子，或者位于同一顶层窗口小部件的一些的子

I created a Frame and then a Canvas.
What I want to do next is to add a Button on the Canvas.
However, when I packed the Button I cannot see the Canvas!

Here is what I tried:

from Tkinter import Tk, Canvas, Frame, Button
from Tkinter import BOTH, W, NW, SUNKEN, TOP, X, FLAT, LEFT

class Example(Frame):
    def __init__(self, parent):
        Frame.__init__(self, parent)
        self.parent = parent
        self.initUI()

    def initUI(self):
        self.parent.title("Layout Test")
        self.config(bg = '#F0F0F0')
        self.pack(fill = BOTH, expand = 1)
                #create canvas
        canvas1 = Canvas(self, relief = FLAT, background = "#D2D2D2",
                                            width = 180, height = 500)
        canvas1.pack(side = TOP, anchor = NW, padx = 10, pady = 10)
        #add quit button
        button1 = Button(canvas1, text = "Quit", command = self.quit,
                                                            anchor = W)
        button1.configure(width = 10, activebackground = "#33B5E5",
                                                        relief = FLAT)
        button1.pack(side = TOP)

def main():
    root = Tk()
    root.geometry('800x600+10+50')
    app = Example(root)
    app.mainloop()

if __name__ == '__main__':
    main()

解决方案

The Tkinter pack manager tries to resize the parent widget to the correct size to contain its child widgets, and no larger, by default. So the canvas is there - but it's precisely the same size as the button, and thus invisible.

If you want to place a widget on a canvas without causing the canvas to dynamically resize, you want the Canvas.create_window() function:

# ... snip ...
button1 = Button(self, text = "Quit", command = self.quit, anchor = W)
button1.configure(width = 10, activebackground = "#33B5E5", relief = FLAT)
button1_window = canvas1.create_window(10, 10, anchor=NW, window=button1)

This will create your button with upper-left corner at (10, 10) relative to the canvas, without resizing the canvas itself.

Note that you could replace the window argument with a reference to any other Tkinter widget. One caveat, though: the named widget must be a child of the top-level window that contains the canvas, or a child of some widget located in the same top-level window.

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