Kivy 不使用 ColorPicker return 颜色值

Question

我在 Popup 中遇到了 ColorPicker 的问题。按 'PICK AND CLOSE' 后我需要颜色值（不带 # 的十六进制代码）return，但我只打印了两次白色值。在运行代码之后。

我的代码（Python 3.6，kivy 1.9.1）：

from kivy.lang import Builder
from kivy.app import App
from kivy.uix.popup import Popup
from kivy.uix.boxlayout import BoxLayout
from kivy.uix.colorpicker import ColorPicker

Builder.load_string('''
<PaintWindow>:
    orientation: 'vertical'

<PopupColor>:
    title: 'Pick a Color'
    size_hint: 1.0, 0.6
    id: popupcolor

    BoxLayout:
        orientation: 'vertical'

        ColorPicker:
            size_hint: 1.0, 1.0

        Button:
            text: 'PICK AND CLOSE'
            color: 0.435, 0.725, 0.56, 1
            background_color: 0, 0.26, 0.27, 1
            size_hint: 1.0, 0.2
            on_press: popupcolor.on_press_dismiss()
''')


class PaintWindow(BoxLayout):
    pass


class PopupColor(Popup):
    def on_press_dismiss(self, *args):
        self.dismiss()
        return False


class PopupRun(App):
    def build(self):
        main_window = PaintWindow()
        popup = PopupColor()
        popup_color = ColorPicker()
        popup.open()

        def on_color(instance, value):
            print("RGBA = ", str(value))
            print("HSV = ", str(instance.hsv))
            print("HEX = ", str(instance.hex_color))
            hex_color = str(instance.hex_color)
            # Return hex color code without '#'
            return hex_color[1:]

        # Return valye after change color in ColorPicker
        popup_color.bind(color=on_color)

        return main_window


PopupRun().run()

Answer 1

您可以将 ColorPicker 传递给 dismiss 方法。
首先给你的 ColorPicker 一个 kv 中的 id:

ColorPicker:
    id: colorpicker
    size_hint: 1.0, 1.0

然后传给on_press方法：

Button:
    text: 'PICK AND CLOSE'
    color: 0.435, 0.725, 0.56, 1
    background_color: 0, 0.26, 0.27, 1
    size_hint: 1.0, 0.2
    on_press: popupcolor.on_press_dismiss(colorpicker)

在python中：

class PopupColor(Popup):
    def on_press_dismiss(self, colorpicker, *args):
        self.dismiss()
        color = str(colorpicker.hex_color)[1:]
        print(color)

Kivy 不使用 ColorPicker return 颜色值

Kivy doesn't return color value with ColorPicker

python

color-picker

kivy