使用 flutter/dart vscode 显示 "method isn't defined" 当我在调用它之前检查特定的 mixin

Question

这是我第一次弄乱 dart，我被这个愚蠢的错误困住了。我有 90% 的把握认为错误出在它的 vscode 部分，因为当运行应用时没有错误显示。

也许我以错误的方式解决了问题，我只是想在实现混合的对象中调用混合函数。例如，在 java 中，需要转换组件变量，但我无法在这种情况下进行转换。

代码

错误

The method 'onPanUpdate' isn't defined for the class 'Component'. Try correcting the name to the name of an existing method, or defining a method named 'onPanUpdate'.

源代码

Repo link

Component class source

Answer 1

Maybe I'm approaching the problem in the wrong way, I simply want to call a mixin function in objects that implements the mixin. In java for example it would be required to cast the component variable, but I couldn't get cast to work in this situation.

要使其正常工作，必须使用以下代码来完成：

for (var component in this.components) {
  if (component is PanDetector) {
    (component as PanDetector).onPanUpdate(details);
  }
}

特别感谢

使用 flutter/dart vscode 显示 "method isn't defined" 当我在调用它之前检查特定的 mixin

Using flutter/dart vscode shows "method isn't defined" when i check for a specific mixin before calling it

mixins

dart

visual-studio-code

flutter

代码

错误

源代码