执行鼠标事件时更改光标 [英] Change cursor when doing a mouse event

问题描述

如何使用 Tkinter 在 Python 中更改鼠标事件(例如右键单击)的光标?当我按右键时，光标会改变，但当我松开时，光标不会改变.

How to change the cursor for a mouse event (right click for example) in Python with Tkinter ? When I press the right click, the cursor is changing but when I release it, the cursor doesn't change.

class App(Frame):
    def __init__(self, master=None):
        Frame.__init__(self, master)
        self.new_width=800
        self.new_height=600

        # Main window
        self.fen = Tk()
        self.fen.title("Image")

        canevas = Canvas(self.fen, bd=0) ## creation of the canvas
        canevas.config(bg="white")

        canevas.config(cursor="dotbox")

        canevas.pack(fill=BOTH,expand=True) ## I place the canvas with the .pack() method

        canevas.config(scrollregion=canevas.bbox("all"))

        w=canevas.winfo_width()
        h=canevas.winfo_height()

        self.fen.update()

        # This is what enables using the mouse:
        canevas.bind("<ButtonPress-3>", self.move_start)
        canevas.bind("<B3-Motion>", self.move_move)

        # start :
    def run(self):
        self.fen.mainloop()

    #move
    def move_start(self,event):
        self.canevas.config(cursor="fleur")

    def move_move(self,event):
        self.canevas.config(cursor="fleur")

推荐答案

绑定一个事件到按钮的释放，使用

Bind an event to the release of the button which changes the cursor back to "dotbox" using

canevas.bind("<ButtonRelease-3>", self.move_stop)

那么你就不需要事件，光标会一直停留在"fleur"直到你松开按钮

Then you don't need the <B3-Motion> event, the cursor just stays "fleur" until you release the button

在您发布的代码中，您需要将所有提到的 canevas 替换为 self.canevas 以便能够在 move_start 函数(以及任何其他类方法)

In the code you posted, you need to replace every mention of canevas to self.canevas to be able to reference to it in the move_start function (and any other class methods)

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