Wire Components"
From Documentation
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| − | Although the design principle of MVVM pattern is that '''ViewModel should not have any reference to UI components''', ZK still provides two ways to retrieve UI components in a ViewModel. '''We don't suggest this usage''' because it loses the ViewModel an important advantage: loosely coupling with View. Please | + | Although the design principle of MVVM pattern is that '''ViewModel should not have any reference to UI components''', ZK still provides two ways to retrieve UI components in a ViewModel. <span style="color:#FF0000">'''We don't suggest this usage'''</span> because it loses the ViewModel an important advantage: loosely coupling with View. '''Notice that binder also manipulates UI components, so your operation to UI components might affect binder's work. Please be careful when using it.''' |
One way is [[ZK Developer's Reference/MVVM/Advance/Parameters |passing components as parameters in command binding]] which we have talked before. Another is to wire components by <tt> Selectors.wireComponents() </tt>. This way enables you to wire components with <tt> @Wire </tt> like [[ZK Developer's Reference/MVC/Controller/Wire Components| you do in a SelectorComposer]]. | One way is [[ZK Developer's Reference/MVVM/Advance/Parameters |passing components as parameters in command binding]] which we have talked before. Another is to wire components by <tt> Selectors.wireComponents() </tt>. This way enables you to wire components with <tt> @Wire </tt> like [[ZK Developer's Reference/MVC/Controller/Wire Components| you do in a SelectorComposer]]. | ||
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'''Example to wire components in a ViewModel''' | '''Example to wire components in a ViewModel''' | ||
Revision as of 01:40, 29 May 2012
Although the design principle of MVVM pattern is that ViewModel should not have any reference to UI components, ZK still provides two ways to retrieve UI components in a ViewModel. We don't suggest this usage because it loses the ViewModel an important advantage: loosely coupling with View. Notice that binder also manipulates UI components, so your operation to UI components might affect binder's work. Please be careful when using it.
One way is passing components as parameters in command binding which we have talked before. Another is to wire components by Selectors.wireComponents() . This way enables you to wire components with @Wire like you do in a SelectorComposer.
Example to wire components in a ViewModel
public class SearchAutowireVM{
//UI component
@Wire("#msgPopup")
Popup popup;
@Wire("#msg")
Label msg;
@Init
public void init(@ContextParam(ContextType.VIEW) Component view){
Selectors.wireComponents(view, this, false);
}
}
- Selectors.wireComponents()'s first parameters is Root View Component which can be retrieved by @ContextParam
Version History
| Version | Date | Content |
|---|---|---|
| 6.0.0 | February 2012 | The MVVM was introduced. |