Kivy在屏幕尺寸变化时更新图像

Question

我的问题是这样的。我有一张背景图片，效果很好，当我调整窗口大小时，图片也会按照设计的方式移动。但是在我的登录类中，'check-icon.png'根本不显示。日志上说它已经加载了，但在窗口的任何地方都看不到它。而且，当我把登录类的代码改成：

with self.canvas.before:
    self.image = Image(stuff)

而不是

with root.canvas.before:
    self.image = Image(stuff)

（这里把root改成self），我可以让check-icon.png显示出来，但它在窗口大小变化时并没有像背景图片那样重新对齐。

import kivy
kivy.require('1.8.0') # current kivy version
import ConfigParser
from kivy.app import App
from kivy.uix.widget import Widget
from kivy.uix.label import Label
from kivy.uix.textinput import TextInput
from kivy.uix.image import Image
from kivy.graphics import Rectangle


class login(Widget):
    #checking to see if the user logging in has privilage to access program
    def validate(self, *args):

        username = self.ids['user']
        user = username.text
        config = ConfigParser.ConfigParser()
        config.read('Privilage.cfg')

        if not config.has_section('users'):
            print 'the Privilage.cfg file has been tampered with'

        if not config.has_option('users',user):
            print 'user is not listed'
        else:
            userPriv = config.get('users',user)
            print 'user',user,'has privilage',userPriv
            valid = '/Users/Kevin/Desktop/Python-extras/SSS Assistant/Manager_images/check-icon.png'

        #Put a check or x next to username based on if its in the system
        self.root = root = login()
        root.bind(size=self._update_image,pos=self._update_image)
        with root.canvas.before:
            self.image = Image(source=valid, pos=((self.width / 2)+130,(self.top / 2)), size=(25,25))


    def _update_image(self,instance,value):
        self.image.pos = instance.pos
        self.image.size = instance.size

class DataApp(App):
    def build(self):
        #login is the root Widget here
        self.root = root = login()
        root.bind(size=self._update_rect,pos=self._update_rect)
        with root.canvas.before:
            self.rect = Rectangle(source="/Users/Kevin/Desktop/Python-extras/SSS Assistant/Manager_images/background.jpg",size=root.size,pos=root.pos)
        return root

    def _update_rect(self,instance,value):
        self.rect.pos = instance.pos
        self.rect.size = instance.size



if __name__ == '__main__':
    DataApp().run()

另外，抱歉我发了这么长的内容。我知道我应该只发相关的代码，但因为我还是新手，所以想确保错误不是出现在代码的其他地方。

新的代码是：

    self.bind(size=self._update_image,pos=self._update_image)
    #Put a check or x next to username based on if its in the system
    self.image = self.add_widget(Image(source=valid, pos=((self.width / 2)+115,(self.top / 2)+50), size=(20,20)))



def _update_image(self,instance,value):
    self.image.pos = instance.pos
    self.image.size = instance.size

事件处理资源加载界面设计 kivy 窗口大小调整图像对齐登录界面背景图片

Kivy在屏幕尺寸变化时更新图像

1 个回答

撰写回答