在后台运行进程时弹出Kivy显示 [英] Pop up Kivy displaying while a process is running in background

问题描述

在我的kivy项目中，我有一个按钮可以让我生成.png格式的matplotlib图.生成此图像需要花费时间(大约20秒)，我想显示一个弹出窗口来警告用户.

In my kivy project, I have a button allowing me to generate a matplotlib graph in .png format. Generating this image takes time (around 20 seconds), and I would like to display a pop-up window to warn the user.

我尝试了什么:

<MyPopup@Popup>:
    auto_dismiss: False
    Button:
        text: 'This could take time, please wait :)  '
        on_release: root.dismiss()

和:

ActionButton:
                        text: 'generate graph'
                        on_release: Factory.MyPopup().open()
                        #on_release: root.generate_graph() 

不幸的是，如果我取消注释第二个"on_release"，则pop_up窗口将永远不会出现?

Unfortunately, if I uncomment the second "on_release", the pop_up window never appears?

您有任何猜想吗?

先谢谢您！

推荐答案

要在方法运行时显示弹出窗口，请使用线程.当弹出窗口启动时，该方法在线程中运行.

To display a popup while a method is running I use threads. When the popup fires up, the method runs in a thread.

代码:

def popupThread(self):          
    
    #set the popup structure
    self.popup = ActivityBox(self)
    self.popup.open()
    
    # run the method in threads
    t1 = threading.Thread(target = self.someMethod)
    t1.start()

弹出窗口在Builder.load_string()中定义:

def build(self):
        sm = Builder.load_string("""    
<ActivityBox>:
    size_hint: 1, .7
    auto_dismiss: False
    title: 'some activity' 
    title_align: "center"
    title_size: 30
    BoxLayout:
        orientation: "vertical"
        Label:
            font_size: '30sp'
            text: 'work in progress'
        BoxLayout:
            orientation: "horizontal"
            spacing: 10
            size_hint: 1, .5
""")

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