使复合小部件可拖动的问题 [英] Issue in making composite widget draggable

问题描述

我已经创建了一个复合窗口小部件..当我尝试使复合窗口小部件draggable的对象抛出异常
dragHandle必须实现HasMouseDownHandlers，HasMouseUpHandlers，HasMouseMoveHandlers和HasMouseOutHandlers可拖动我是否缺少一些非常importand的东西？

谢谢，
sindhu

解决方案

他们喜欢这样：

  public class MyWidget extends Composite实现HasAllMouseHandlers，HasClickHandlers {
 
 ... 
 
 public HandlerRegistration addClickHandler（ClickHandler handler）{
 return addDomHandler（handler，ClickEvent.getType（））; 
} 
 
 public HandlerRegistration addMouseDownHandler（MouseDownHandler handler）{
 return addDomHandler（handler，MouseDownEvent.getType（））; 
} 
 
 public HandlerRegistration addMouseMoveHandler（MouseMoveHandler handler）{
 return addDomHandler（handler，MouseMoveEvent.getType（））; 
} 
 
 public HandlerRegistration addMouseOutHandler（MouseOutHandler handler）{
 return addDomHandler（handler，MouseOutEvent.getType（））; 
} 
 
 public HandlerRegistration addMouseOverHandler（MouseOverHandler handler）{
 return addDomHandler（handler，MouseOverEvent.getType（））; 
} 
 
 public HandlerRegistration addMouseUpHandler（MouseUpHandler handler）{
 return addDomHandler（handler，MouseUpEvent.getType（））; 
} 
 
 public HandlerRegistration addMouseWheelHandler（MouseWheelHandler handler）{
 return addDomHandler（handler，MouseWheelEvent.getType（））; 
} 
 
} 
  

要获取您的小部件'd working，see this
http://groups.google.com/group/gwt-dnd/browse_thread/thread/85039aaa229d53cf/f5ad10ff9a37ab9d?lnk=gst&q=custom+widget#f5ad10ff9a37ab9d

am relatively very new to gwt n dnd.. i have created a composite widget.. when i try to make the object of the composite widget draggable it throws an exception "dragHandle must implement HasMouseDownHandlers, HasMouseUpHandlers, HasMouseMoveHandlers and HasMouseOutHandlers to be draggable" am i missing something very importand?

Thanks, sindhu

解决方案

You can implement them like this:

public class MyWidget extends Composite implements HasAllMouseHandlers, HasClickHandlers {

...

      public HandlerRegistration addClickHandler(ClickHandler handler) {
        return addDomHandler(handler, ClickEvent.getType());
      }

      public HandlerRegistration addMouseDownHandler(MouseDownHandler handler) {
          return addDomHandler(handler, MouseDownEvent.getType());
      }

      public HandlerRegistration addMouseMoveHandler(MouseMoveHandler handler) {
        return addDomHandler(handler, MouseMoveEvent.getType());
      }

      public HandlerRegistration addMouseOutHandler(MouseOutHandler handler) {
        return addDomHandler(handler, MouseOutEvent.getType());
      }

      public HandlerRegistration addMouseOverHandler(MouseOverHandler handler) {
        return addDomHandler(handler, MouseOverEvent.getType());
      }

      public HandlerRegistration addMouseUpHandler(MouseUpHandler handler) {
        return addDomHandler(handler, MouseUpEvent.getType());
      }

      public HandlerRegistration addMouseWheelHandler(MouseWheelHandler handler) {
        return addDomHandler(handler, MouseWheelEvent.getType());
      }

}

To get your widget d'n'd working, see this http://groups.google.com/group/gwt-dnd/browse_thread/thread/85039aaa229d53cf/f5ad10ff9a37ab9d?lnk=gst&q=custom+widget#f5ad10ff9a37ab9d

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