How to make buttons appear behind a background, or make the buttons background transparent?

问题

(Note: The buttons with borders are part of the background) I would like to place the real buttons behind the image so it would like i'm pressing the button in the background, however, i'm actually pressing the button behind it.

def __init__(self, parent, controller):
    tk.Frame.__init__(self, parent)
    self.controller = controller

    background_image = tk.PhotoImage(file="Mainmenu.png")  # Displays whats in the file
    background_label = tk.Label(self, image=background_image)  # Makes tk.Label display the background_image
    background_label.place(x=0, y=0, relwidth=1, relheight=1)  # Adjusts the height/width

    background_label.image = background_image  # Recognises the label as an image

    button1 = tk.Button(self, text="Play", bg="red", fg="black", height=2, width=15,
                        command=lambda: controller.show_frame("Play"))
    button2 = tk.Button(self, text="Settings", bg="yellow", fg="black", height=2, width=15,
                        command=lambda: controller.show_frame("Settings"))
    button3 = tk.Button(self, text="Quit", bg="white", fg="black", height=2, width=15, cursor="pirate",
                        command=exit)

    button1.place(x="300",y="240")
    button2.place(x="480",y="240")
    button3.place(x="390",y="300")
    button1.config(font=("System", 10))
    button2.config(font=("System", 10))
    button3.config(font=("System", 10))

回答1:

Question: let the user click directly on the background

Define a class object inherited from tk.Canvas

class Menu(tk.Canvas):
    def __init__(self, parent, image, command, show_areas=False):
        """
        Init a Canvas object, displaying a image
        Bind the Mouse click to a function
        Init a dict to hold the added clickable areas

        :param parent: The parent widget
        :param image: The image object
        :param command: The callback command to handle area clicks
        :param show_areas: For debug/trace purpose. If 'True'show the clickable areas.
        """
        super().__init__(parent)
        # Feed TKinter the image
        self._image = image
        self.create_image(0, 0, image=self._image, anchor='nw')

        self.callback = command
        self.bind('<Button-1>', self.Button_1_func)

        self.show_areas = show_areas
        self.areas = {}

The Mouse-Click-Handler function.
Search for a matching area and call the .callback function with the tag

    def Button_1_func(self, event):
        for tag, (x, y, x2, y2) in self.areas.items():
            if event.x in range(x, x2) and event.y in range(y, y2):
                event.tag = tag
                self.callback(event)
                return 'break'

Add a new clickable area with given tag and computed geometry.
15 * 10 computes the area width
5 * 10 computes the area height
If self.show_areas is True, create a rectangle with the geometry.

    def add_area(self, tag, coord):
        self.areas[tag] = *coord, (coord[0] + (15 * 10)) + 1, (coord[1] + (5 * 10)) + 1

        if self.show_areas:
            self.create_rectangle(self.areas[tag])

Usage:

class App(tk.Tk):
    def __init__(self):
        super().__init__()

        # Displays as background_image what's in the file
        self.menu = Menu(self,
                         image=tk.PhotoImage(file="Mainmenu.png"),
                         command=self.command,
                         show_areas=True)
        self.menu.place(x=0, y=0, relwidth=1, relheight=1)

        for tag, coords in [('Play', (300, 240)), 
                            ('Settings', (480, 240)), 
                            ('Quit', (390, 300))]:
            self.menu.add_area(tag, coords)

    def show_frame(self, key):
        # Simulating controller.show_frame
        print('show_frame({})'.format(key))

    def command(self, event):
        if event.tag in ['Play', 'Settings']:
            self.show_frame(event.tag)

        if event.tag == 'Quit':
            self.quit()

if __name__ == "__main__":
    App().mainloop()

Tested with Python: 3.5

来源：https://stackoverflow.com/questions/55936650/how-to-make-buttons-appear-behind-a-background-or-make-the-buttons-background-t

标签

python

tkinter

tkinter-canvas