CustomCalendar | 定制日历控件

Try to take a reference of your view first, I see in your code that you call viewTreeObserver.addOnGlobalLayoutListener,

view.scroll_view.viewTreeObserver.addOnGlobalLayoutListener or this error say that your scroll_view is null.

To avoid this, I think you have to take a reference of your view first, it make your code more clean and readable also.

Here is an exemple:

Lol I don't know why it didn't work before, but if you are looking for something like this

You are actually trying to access a property of the state of MyCalendar rather than of MyCalendar itself. To expose the state you can refer to this answer how to access an object created in one stateful widget in another stateful widget in flutter and implement it like this for example:

If your file would contain valid JSON format, it would be an easy task to read the file and convert your data structures to dictionaries.

To give an example, consider having the following line of text in a file text.txt:

Unfocused event is raised whenever the VisualElement loses focus, and it only works for the element which is able to receive focus , unfortunately ContentView can't receive focus , so focused and Unfocused event would never trigger on ContentView .

Elements that can receive focus : Entry , Editor , Picker, and so on ...

As a temporary workaround , you could wrap the ContentView into StackLayout, set tap gesture both on ContentView and parenet layout , its own tap gesture will block parent view's gesture .

When you need to use an instance in your route, you have to declare it in the Camel Registry. So you should like it has been here [1]

With the @bindToRegistry annotation, you'll add your instance to the registry and you'll be able to reference it in your route through the '#' symbol.