org.zkoss.zul
Interface ListitemRendererExt

public interface ListitemRendererExt

Provides additional control to ListitemRenderer.

Author:

tomyeh

See Also:

ListitemRenderer

Field Summary

static int

DETACH_ON_RENDER Returned by getControls() to indicate that the list cells added by newListcell(org.zkoss.zul.Listitem) must be detached before calling ListitemRenderer.render(org.zkoss.zul.Listitem, T, int).

Method Summary

int	getControls() Returns how a listbox shall render the live data.
Listcell	newListcell(Listitem item) Create an instance of Listcell that will be attached to the unloaded listitem.
Listitem	newListitem(Listbox listbox) Creates an instance of Listitem that will be attached to listbox.

Field Detail

DETACH_ON_RENDER

static final int DETACH_ON_RENDER

Returned by getControls() to indicate that the list cells added by newListcell(org.zkoss.zul.Listitem) must be detached before calling ListitemRenderer.render(org.zkoss.zul.Listitem, T, int).

Default: true.
If this interface is not specified, this flag is assumed to be specified.

If you implement this interface and doesn't return this flag in getControls(), the implementation of ListitemRenderer.render(org.zkoss.zul.Listitem, T, int) must be aware of the existence of the first cell (of the passed list item).

See Also:

Constant Field Values

Method Detail

newListitem

Listitem newListitem(Listbox listbox)

Creates an instance of Listitem that will be attached to listbox. The created component will be passed to ListitemRenderer.render(org.zkoss.zul.Listitem, T, int) to append the required information to show a row of the data.

Note: remember to invoke AbstractComponent.applyProperties() to initialize the properties, defined in the component definition, properly.

If null is returned, the default list item is created as follow.

final Listitem item = new Listitem();
item.applyProperties();
return item;

Note: DO NOT call AbstractComponent.setParent(org.zkoss.zk.ui.Component).

Returns:

the list item if you'd like to create it differently, or null if you want Listbox to create it for you

newListcell

Listcell newListcell(Listitem item)

Create an instance of Listcell that will be attached to the unloaded listitem. By unloaded we mean the listitem that is not loaded with the data retreived from the model. That is, ListitemRenderer.render(org.zkoss.zul.Listitem, T, int) is not called yet.

Notice that this callback shall generate an empty cell, rather than showing the data retrieved from the model. The showing of the data from model shall be done in ListitemRenderer.render(org.zkoss.zul.Listitem, T, int).

If null is returned, the default list cell is created as follow.

final Listcell cell = new Listcell();
cell.applyProperties();
return cell;

Note: remember to invoke AbstractComponent.applyProperties() to initialize the properties, defined in the component definition, properly.

Note: DO NOT call AbstractComponent.setParent(org.zkoss.zk.ui.Component). Don't create cells for other columns.

Note: DO NOT call AbstractComponent.setParent(org.zkoss.zk.ui.Component).

Parameters:

item - the list item. It is the same as that is returned by newListitem(org.zkoss.zul.Listbox)

Returns:

the list cell if you'd like to create it differently, or null if you want Listbox to create it for you

getControls

int getControls()

Returns how a listbox shall render the live data.

Note: if this interface is not implemented, DETACH_ON_RENDER is assumed.

Returns:

DETACH_ON_RENDER or 0 to indicate how to render the live data.