cn.ennwifi.webframe.ui.client.data.AbstractDataProvider Maven / Gradle / Ivy
package cn.ennwifi.webframe.ui.client.data;
import java.util.ArrayList;
import java.util.List;
import com.google.gwt.event.shared.EventHandler;
import com.google.gwt.event.shared.GwtEvent;
import com.google.gwt.event.shared.HandlerManager;
import com.google.gwt.event.shared.HandlerRegistration;
import com.google.gwt.user.client.ui.Widget;
import com.ksyzt.gwt.client.data.IFieldValue;
import com.ksyzt.gwt.client.event.HasMessageHandlers;
import com.ksyzt.gwt.client.event.MessageEvent;
import com.ksyzt.gwt.client.event.MessageHandler;
/**
* 提供缺省的数据提供者接口.
*
* @author zhangjianshe
*/
public abstract class AbstractDataProvider implements IDataProvider, HasMessageHandlers {
/**
* The listners.
*/
ArrayList listners;
/**
* Instantiates a new abstract data provider.
*/
public AbstractDataProvider() {
listners = new ArrayList();
}
/*
* (non-Javadoc)
*
* @see cn.enn.neyun.ui.client.data.IDataProvider#getTitle()
*/
@Override
public abstract String getTitle();
/*
* (non-Javadoc)
*
* @see cn.enn.neyun.ui.client.data.IDataProvider#getPageSizeList()
*/
@Override
public int[] getPageSizeList() {
return new int[] {10, 20, 30, 40, 50};
}
/*
* (non-Javadoc)
*
* @see cn.enn.neyun.ui.client.data.IDataProvider#getTotalCount()
*/
@Override
public abstract Integer getTotalCount();
/*
* (non-Javadoc)
*
* @see cn.enn.neyun.ui.client.data.IDataProvider#getCount()
*/
@Override
public abstract long getCount();
/*
* (non-Javadoc)
*
* @see cn.enn.neyun.ui.client.data.IDataProvider#getHeaders()
*/
@Override
public List getHeaders() {
return new ArrayList();
}
/*
* (non-Javadoc)
*
* @see cn.enn.neyun.ui.client.data.IDataProvider#render(int, int,
* com.ksyzt.gwt.client.data.IFieldValue, java.lang.Object)
*/
@Override
public Widget render(int row, int col, IFieldValue rowdata, Object cellData) {
return null;
}
/*
* (non-Javadoc)
*
* @see cn.enn.neyun.ui.client.data.IDataProvider#registerListener(cn.enn.neyun.ui.client.data.
* IListener)
*/
@Override
public void registerListener(IListener listener) {
if (listener != null) {
listners.add(listener);
}
}
/*
* (non-Javadoc)
*
* @see cn.enn.neyun.ui.client.data.IDataProvider#unregisterListener(cn.enn.neyun.ui.client.data.
* IListener)
*/
@Override
public void unregisterListener(IListener listener) {
if (listener != null) {
listners.remove(listener);
}
}
/*
* (non-Javadoc)
*
* @see cn.enn.neyun.ui.client.data.IDataProvider#getRowData(int)
*/
@Override
public abstract IFieldValue getRowData(int row);
/*
* (non-Javadoc)
*
* @see cn.enn.neyun.ui.client.data.IDataProvider#notifyDataChange()
*/
@Override
public void notifyDataChange() {
for (IListener l : listners) {
l.invalidate();
}
}
/**
* Creates the {@link HandlerManager} used by this Widget. You can override this method to create
* a custom {@link HandlerManager}.
*
* @return the {@link HandlerManager} you want to use
*/
protected HandlerManager createHandlerManager() {
return new HandlerManager(this);
}
/**
* Adds this handler to the widget.
*
* @param the type of handler to add
* @param handler the handler
* @param type the event type
* @return {@link HandlerRegistration} used to remove the handler
*/
public final HandlerRegistration addHandler(final H handler, GwtEvent.Type type) {
return ensureHandlers().addHandler(type, handler);
}
/**
* Ensures the existence of the handler manager.
*
* @return the handler manager
*/
HandlerManager ensureHandlers() {
return handlerManager == null ? handlerManager = createHandlerManager() : handlerManager;
}
/** The handler manager. */
private HandlerManager handlerManager;
/*
* (non-Javadoc)
*
* @see com.google.gwt.event.shared.HasHandlers#fireEvent(com.google.gwt.event.shared.GwtEvent)
*/
@Override
public void fireEvent(GwtEvent event) {
if (handlerManager != null) {
ensureHandlers().fireEvent(event);
}
}
/*
* (non-Javadoc)
*
* @see
* com.ksyzt.gwt.client.event.HasMessageHandlers#addMessageHandler(com.ksyzt.gwt.client.event.
* MessageHandler)
*/
@Override
public HandlerRegistration addMessageHandler(MessageHandler handler) {
return addHandler(handler, MessageEvent.TYPE);
}
}