Question

我有一块画布。当我右键单击它时：

它会返回我单击过的坐标，没关系；
打开具有某些功能的弹出菜单，但距离较远（从左至上），这是一个主要问题。那没关系；

我希望此菜单在我右键单击的位置（从鼠标单击的位置右上方）旁边打开。

我应该如何指定在何处打开此菜单，或者可能需要更改某些属性？

from tkinter import *
from tkinter import ttk # for Treeview


class Main(Frame):
    def __init__(self, main):
        Frame.__init__(self, main)
        # Vars that will be defined by user:
        self.frame_width = 300
        self.frame_height = 300
        self.canvas_width = 600
        self.canvas_height = 600

        # Flexible widgets when window size alters:
        main.columnconfigure(0, weight=1)
        main.rowconfigure(0, weight=1)

        # Some text
        Label(text='Some text 1').grid(row=0, column=0)
        Label(text='Some text 2').grid(row=1, column=0)
        Label(text='Some text 3').grid(row=2, column=0)
        Label(text='Some text 4').grid(row=3, column=0)
        Label(text='Some text 5').grid(row=4, column=0)

        # Canvas and frame
        canvas_frame = Frame(main, width=self.frame_width, height=self.frame_height, relief='groove')
        canvas_frame.grid(row=1, column=1)
        canvas_frame.grid_propagate(False)
        self.canvas = Canvas(canvas_frame, width = self.canvas_width, height = self.canvas_height,
                        bg='bisque')
        self.canvas.grid(row=0, column=0)

        # (!!!) RIGHT CLICK MENU
        self.rmenu = Menu(self.canvas, tearoff=0, takefocus=0)
        self.rmenu.add_command(label='Add', command=self.hello)
        self.canvas.bind("<ButtonPress-3>", self.popup)

        # Bind
        self.canvas.bind("<ButtonPress-1>", self.scroll_start)
        self.canvas.bind("<B1-Motion>", self.scroll_move)

        # Functions
        self.grid(self.canvas)
    # End of init function.


    # canvas popup menu: --------------------------------------------------
    # (!!!) HERE IS THE POPUP RIGHTCLICK MENU FUNCTIONS
    def popup(self, event):
        self.rmenu.tk_popup(event.x + 40, event.y + 10, entry="0")
        coords_1 = []
        coords_1 += [[event.x, event.y]]
        print(coords_1)

    def hello(self):
        print('hello')

    # grid:  --------------------------------------------------

    def grid(self, canvas):
        for l in range(0, self.canvas_width, 10):
            canvas.create_line([(l, 0), (l, self.canvas_width)], fill='#d9d9d9')
        for l in range(0, self.canvas_height, 10):
            canvas.create_line([(0, l), (self.canvas_height, l)], fill='#d9d9d9')

    # scrolling canvas: ----------------------------------------

    def scroll_start(self, event):
        self.canvas.scan_mark(event.x, event.y)

    def scroll_move(self, event):
        self.canvas.scan_dragto(event.x, event.y, gain=1)



if __name__ == '__main__':
    main = Tk()
    # Making window opens in the centre of the screen
    w = 800
    h = 650
    ws = main.winfo_screenwidth()
    hs = main.winfo_screenheight()
    x = (ws / 2) - (w / 2)
    y = (hs / 2) - (h / 2)
    main.geometry('%dx%d+%d+%d' % (800, 600, x, y))
    #
    Main(main)
    main.mainloop()

我用（!!!）和大写字母指出的所有必要部分

Answer 1

使用event.x_root和event.y_root代替event.x，event.y来获取绝对屏幕坐标。

self.rmenu.tk_popup(event.x_root + 40, event.y_root + 10, entry="0")

文档：Events and Bindings

顺便说一句：还有

x = root.winfo_pointerx()
y = root.winfo_pointery()

也可以给出鼠标的绝对屏幕坐标。

（Stackoverflow：Mouse Position Python Tkinter）

Answer 2

仅使用self.rmenu.tk_popup(event.x_root, event.y_root, entry="0")，而不使用self.rmenu.tk_popup(event.x + 40, event.y + 10, entry="0")。那是错误。菜单需要绝对的指针位置，并且event.x，event.y是相对的。希望对您有所帮助！

右键单击菜单打开，远离单击的位置

2 个答案: