[英]What are the patterns in communication between View and Presenter in MVP?
Reading about MVP pattern I found there are two communication patterns between View and Presenter: 阅读MVP模式我发现View和Presenter之间有两种通信模式:
View doesn't know Presenter but provides UI controls implementing HasClickHandler
interface where Presenter registers its event handlers. View不知道Presenter,但提供了实现
HasClickHandler
接口的UI控件,其中Presenter注册其事件处理程序。
View knows Presenter , particularly it knows handler method names in Presenter, eg, when a Submit button is clicked in View, a view calls a onSubmitButtonClicked()
public method in Presenter. View知道Presenter ,特别是它知道Presenter中的处理程序方法名称,例如,当在View中单击Submit按钮时,视图在Presenter中调用
onSubmitButtonClicked()
公共方法。
I found the latter to be easier for JUnit testing, because I can directly simulate submitting event to Presenter. 我发现后者更容易进行JUnit测试,因为我可以直接模拟向Presenter提交事件。 However, my understanding was that the View should not know about the Presenter.
但是,我的理解是View不应该知道Presenter。
The third approach to resolve the trade-off is to let the Presenter registers event handlers in the View's controls, where the handlers calls public Presenter methods: 解决权衡的第三种方法是让Presenter在View的控件中注册事件处理程序,处理程序调用公共Presenter方法:
public void bind() {
display.getSubmitButton().addClickHandler(new ClickHandler() {
@Override
public void onClick(ClickEvent event) {
onSubmitButtonClicked();
}
});
}
But this introduces a lot of boilerplate code. 但是这引入了许多样板代码。
What is the right pattern for View-Presenter communication? View-Presenter通信的正确模式是什么?
I'm still trying to learn this stuff myself, but the way I'm thinking about it now is something like this: 我自己还在尝试学习这些东西,但我现在想的方式是这样的:
public interface View {
void registerMouseListener(MouseListener listener);
}
public class ViewImpl implements View {
SomeComponent component; // SomeComponent extends java.awt.Component
public void registerMouseListener(MouseListener listener) {
component.addMouseListener(listener);
}
}
Then you can let the Presenter
decide however it wants to register for these events, by adding anonymous listeners, or extending MouseListener
itself, etc. 然后你可以让
Presenter
决定注册这些事件,添加匿名监听器,或者扩展MouseListener
本身等。
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