Kivy:越过应用程序窗口的左边缘或上边缘时，自定义鼠标光标的不良行为 [英] Kivy: undesirable behavior of custom mouse cursor when crossing left or top edge of app window

问题描述

我想用猕猴桃做一个自定义的鼠标光标. 这是我目前所拥有的:

I want to make a custom mouse cursor in kivy. This is what I have at the moment:

from kivy.app import App
from kivy.lang import Builder
from kivy.uix.button import Button
from kivy.uix.textinput import TextInput
from kivy.uix.scatter import Scatter
from kivy.core.window import Window
#Window.show_cursor = False

KV = """
FloatLayout
    BoxLayout
        MyTextInput
    MyMouse


<MyTextInput>:
    font_size: 40
    text: 'Some text'

<MyMouse>:
    mouse_im_size: mouse_im.size
    auto_bring_to_front: True

    do_rotation:False
    do_scale:False
    do_translation_y:False

    Image
        id: mouse_im
        size: 100, 100 / self.image_ratio
        source: 'cursor-pink.png'

"""

class MyTextInput(TextInput):
    pass

class MyMouse(Scatter):
    def __init__(self, **kwargs):
        Window.bind(mouse_pos=self.on_mouse_pos)
        super(MyMouse, self).__init__(**kwargs)

    def on_touch_down(self, *touch):
        return

    def on_mouse_pos(self, *args):
        x,y = args[1]
        self.pos = [x,y-self.mouse_im_size[1]]


class MyApp(App):
    def build(self):
        self.root = Builder.load_string(KV)

MyApp().run()

问题是，当我将鼠标移到应用程序的左边缘或上边缘之外时，光标图像仍保留在应用程序内，并且我希望鼠标图像消失，就像我将鼠标移到右边缘或下边缘之外时一样

the problem is that when I move the mouse beyond the left or upper edge of application, the cursor image remains within the app, and I want the mouse image to disappear just like when I move the mouse beyond the right or lower edge.

问题似乎是on_mouse_pos()仅在鼠标位于窗口内时有效.

It seems the problem is that on_mouse_pos() only works when the mouse is inside the window.

我找到了一种方法来获取鼠标的位置当它在窗口之外时，但我不知道如何在任务中使用它.也许有更好的方法可以做到这一点.

I found a way to get the position of the mouse when it is outside the window, but I do not know how this can be used in my task. And maybe there is a better way to do this.

推荐答案

您可以通过使用Window事件on_cursor_enter和on_cursor_leave并通过使用opacity属性使光标可见/不可见来实现此目的:

You can accomplish this by using the Window events on_cursor_enter and on_cursor_leave and making the cursor visible/invisible by using the opacity property:

from kivy.app import App
from kivy.lang import Builder
from kivy.uix.button import Button
from kivy.uix.textinput import TextInput
from kivy.uix.scatter import Scatter
from kivy.core.window import Window
#Window.show_cursor = False

KV = """
FloatLayout
    BoxLayout
        MyTextInput
    MyMouse
        id: themouse


<MyTextInput>:
    font_size: 40
    text: 'Some text'

<MyMouse>:
    mouse_im_size: mouse_im.size
    auto_bring_to_front: True

    do_rotation:False
    do_scale:False
    do_translation_y:False

    Image
        id: mouse_im
        size: 100, 100 / self.image_ratio
        source: 'cursor-pink.png'

"""

class MyTextInput(TextInput):
    pass

class MyMouse(Scatter):
    def __init__(self, **kwargs):
        Window.bind(mouse_pos=self.on_mouse_pos)
        Window.bind(on_cursor_leave=self.on_cursor_leave)
        Window.bind(on_cursor_enter=self.on_cursor_enter)
        super(MyMouse, self).__init__(**kwargs)

    def on_touch_down(self, *touch):
        return

    def on_mouse_pos(self, *args):
        x,y = args[1]
        self.pos = [x,y-self.mouse_im_size[1]]

    def on_cursor_leave(self, *args):
        App.get_running_app().root.ids.themouse.opacity = 0

    def on_cursor_enter(self, *args):
        App.get_running_app().root.ids.themouse.opacity = 1


class MyApp(App):
    def build(self):
        self.root = Builder.load_string(KV)

MyApp().run()

我将themouse id添加到了MyMouse小部件中.

I added the themouse id to the MyMouse widget to accomplish this.

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