org.zkoss.zul

Class Listheader

java.lang.Object

org.zkoss.zk.ui.AbstractComponent

org.zkoss.zk.ui.HtmlBasedComponent

org.zkoss.zul.impl.XulElement

org.zkoss.zul.impl.LabelElement

org.zkoss.zul.impl.LabelImageElement

org.zkoss.zul.impl.HeaderElement

org.zkoss.zul.Listheader

All Implemented Interfaces:

java.io.Serializable, java.lang.Cloneable, Component, Scope, ComponentCtrl

public class Listheader
extends HeaderElement

The list header which defines the attributes and header of a column of a list box. Its parent must be Listhead.

Difference from XUL:

1. There is no listcol in ZUL because it is merged into Listheader. Reason: easier to write Listbox.

Default getZclass(): z-listheader.(since 5.0.0)

Author:

tomyeh

See Also:

Serialized Form

Nested Class Summary

Nested classes/interfaces inherited from class org.zkoss.zul.impl.LabelImageElement

LabelImageElement.ExtraCtrl

Nested classes/interfaces inherited from class org.zkoss.zk.ui.AbstractComponent

AbstractComponent.Children

Field Summary

Fields inherited from class org.zkoss.zk.ui.HtmlBasedComponent

_zclass

Fields inherited from interface org.zkoss.zk.ui.Component

APPLICATION_SCOPE, COMPONENT_SCOPE, DESKTOP_SCOPE, PAGE_SCOPE, REQUEST_SCOPE, SESSION_SCOPE, SPACE_SCOPE

Fields inherited from interface org.zkoss.zk.ui.sys.ComponentCtrl

CE_BUSY_IGNORE, CE_DUPLICATE_IGNORE, CE_IMPORTANT, CE_NON_DEFERRABLE, CE_REPEAT_IGNORE

Constructor Summary

Constructors

Constructor and Description
Listheader()
Listheader(java.lang.String label)
Listheader(java.lang.String label, java.lang.String src)
Listheader(java.lang.String label, java.lang.String src, java.lang.String width)

Method Summary

Methods

Modifier and Type	Method and Description
void	beforeParentChanged(Component parent) Default: does nothing.
java.lang.Object	clone() Clones the component.
int	getColumnIndex() Returns the column index, starting from 0.
Listbox	getListbox() Returns the listbox that this belongs to.
int	getMaxlength() Returns the maximal length of each item's label.
java.util.Comparator	getSortAscending() Returns the ascending sorter, or null if not available.
java.util.Comparator	getSortDescending() Returns the descending sorter, or null if not available.
java.lang.String	getSortDirection() Returns the sort direction.
<T> T	getValue() Returns the value.
java.lang.String	getZclass() Returns the ZK Cascading Style class(es) for this component.
boolean	group(boolean ascending) Groups and sorts the items (Listitem) based on getSortAscending().
void	onGroupLater(SortEvent event) Internal use only.
void	onSort() Deprecated. As of release 6.5.0, use or override onSort(SortEvent) instead.
void	onSort(SortEvent event) Invokes a sorting action based on a SortEvent and maintains getSortDirection().
protected void	renderProperties(ContentRenderer renderer) Renders the content of this component, excluding the enclosing tags and children.
void	service(AuRequest request, boolean everError) Processes an AU request.
void	setMaxlength(int maxlength) Sets the maximal length of each item's label.
void	setSort(java.lang.String type) Sets the type of the sorter.
void	setSortAscending(java.util.Comparator sorter) Sets the ascending sorter, or null for no sorter for the ascending order.
void	setSortAscending(java.lang.String clsnm) Sets the ascending sorter with the class name, or null for no sorter for the ascending order.
void	setSortDescending(java.util.Comparator sorter) Sets the descending sorter, or null for no sorter for the descending order.
void	setSortDescending(java.lang.String clsnm) Sets the descending sorter with the class name, or null for no sorter for the descending order.
void	setSortDirection(java.lang.String sortDir) Sets the sort direction.
<T> void	setValue(T value) Sets the value.
boolean	sort(boolean ascending) Sorts the list items based on getSortAscending() and getSortDescending(), if getSortDirection() doesn't matches the ascending argument.
boolean	sort(boolean ascending, boolean force) Sorts the list items based on getSortAscending() and getSortDescending().
void	ungroup(boolean ascending) Ungroups and sorts the items (Listitem) based on the ascending.
protected void	updateByClient(java.lang.String name, java.lang.Object value) Called when the widget running at the client asks the server to update a value.

Methods inherited from class org.zkoss.zul.impl.HeaderElement

getAlign, getValign, setAlign, setValign

Methods inherited from class org.zkoss.zul.impl.LabelImageElement

getExtraCtrl, getHoverImage, getHoverImageContent, getIconSclass, getImage, getImageContent, getPropertyAccess, getSrc, isImageAssigned, setHoverImage, setHoverImageContent, setHoverImageContent, setIconSclass, setImage, setImageContent, setImageContent, setSrc

Methods inherited from class org.zkoss.zul.impl.LabelElement

getLabel, renderCrawlable, setLabel

Methods inherited from class org.zkoss.zul.impl.XulElement

getContext, getCtrlKeys, getPopup, getTooltip, setContext, setContext, setCtrlKeys, setPopup, setPopup, setTooltip, setTooltip

Methods inherited from class org.zkoss.zk.ui.HtmlBasedComponent

focus, getAction, getDraggable, getDroppable, getHeight, getHflex, getLeft, getRenderdefer, getSclass, getStyle, getTooltiptext, getTop, getVflex, getWidth, getZindex, getZIndex, setAction, setClass, setDraggable, setDroppable, setFocus, setHeight, setHeightDirectly, setHflex, setHflexDirectly, setLeft, setLeftDirectly, setRenderdefer, setSclass, setStyle, setTooltiptext, setTop, setTopDirectly, setVflex, setWidth, setWidthDirectly, setZclass, setZindex, setZIndex, setZIndexDirectly

Methods inherited from class org.zkoss.zk.ui.AbstractComponent

addAnnotation, addAnnotation, addClientEvent, addEventHandler, addEventListener, addEventListener, addForward, addForward, addForward, addForward, addMoved, addRedrawCallback, addScopeListener, addShadowRoot, addShadowRootBefore, addSharedEventHandlerMap, appendChild, applyProperties, beforeChildAdded, beforeChildRemoved, detach, didActivate, didActivate, didDeserialize, didDeserialize, disableBindingAnnotation, disableClientUpdate, enableBindingAnnotation, equals, getAnnotatedProperties, getAnnotatedPropertiesBy, getAnnotation, getAnnotation, getAnnotations, getAnnotations, getAnnotations, getAttribute, getAttribute, getAttribute, getAttributeOrFellow, getAttributes, getAttributes, getAuService, getAutag, getChildren, getClientAttribute, getClientDataAttribute, getClientEvents, getDefaultMold, getDefinition, getDesktop, getEventHandler, getEventHandlerNames, getEventListenerMap, getEventListeners, getFellow, getFellow, getFellowIfAny, getFellowIfAny, getFellows, getFirstChild, getId, getLastChild, getListenerIterator, getMold, getNextSibling, getPage, getParent, getPreviousSibling, getRedrawCallback, getRoot, getShadowRoots, getShadowVariable, getShadowVariable0, getSpaceOwner, getSpecialRendererOutput, getStubonly, getSubBindingAnnotationCount, getTemplate, getTemplateNames, getUuid, getWidgetAttribute, getWidgetAttributeNames, getWidgetClass, getWidgetListener, getWidgetListenerNames, getWidgetOverride, getWidgetOverrideNames, hasAttribute, hasAttribute, hasAttribute, hasAttributeOrFellow, hasBindingAnnotation, hasFellow, hasFellow, hasSubBindingAnnotation, insertBefore, invalidate, isChildable, isInvalidated, isListenerAvailable, isVisible, onChildAdded, onChildRemoved, onPageAttached, onPageDetached, onWrongValue, query, queryAll, redraw, redrawChildren, removeAttribute, removeAttribute, removeAttribute, removeChild, removeEventListener, removeForward, removeForward, removeRedrawCallback, removeScopeListener, removeShadowRoot, render, render, render, replace, response, response, response, service, sessionDidActivate, sessionWillPassivate, setAttribute, setAttribute, setAttribute, setAuService, setAutag, setClientAttribute, setClientDataAttribute, setDefinition, setDefinition, setId, setMold, setPage, setPageBefore, setParent, setStubonly, setStubonly, setSubBindingAnnotationCount, setTemplate, setVisible, setVisibleDirectly, setWidgetAttribute, setWidgetClass, setWidgetListener, setWidgetOverride, smartUpdate, smartUpdate, smartUpdate, smartUpdate, smartUpdate, smartUpdate, smartUpdate, smartUpdate, smartUpdate, smartUpdateWidgetListener, smartUpdateWidgetOverride, toString, updateSubBindingAnnotationCount, willPassivate, willPassivate, willSerialize, willSerialize

Methods inherited from class java.lang.Object

finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

Listheader

public Listheader()

Listheader

public Listheader(java.lang.String label)

Listheader

public Listheader(java.lang.String label,
          java.lang.String src)

Listheader

public Listheader(java.lang.String label,
          java.lang.String src,
          java.lang.String width)

Method Detail

getListbox

public Listbox getListbox()

Returns the listbox that this belongs to.

getValue

public <T> T getValue()

Returns the value.

Default: null.

Note: the value is application dependent, you can place whatever value you want.

Since:

3.6.0

setValue

public <T> void setValue(T value)

Sets the value.

Parameters:

value - the value.

Note: the value is application dependent, you can place whatever value you want.

Since:

3.6.0

getSortDirection

public java.lang.String getSortDirection()

Returns the sort direction.

Default: "natural".

setSortDirection

public void setSortDirection(java.lang.String sortDir)
                      throws WrongValueException

Sets the sort direction. This does not sort the data, it only serves as an indicator as to how the list is sorted. (unless the listbox has "autosort" attribute)

If you use sort(boolean) to sort list items, the sort direction is maintained automatically. If you want to sort it in customized way, you have to set the sort direction manually.

Parameters:

sortDir - one of "ascending", "descending" and "natural"

Throws:

WrongValueException

setSort

public void setSort(java.lang.String type)

Sets the type of the sorter. You might specify either "auto", "auto(FIELD_NAME1[,FIELD_NAME2] ...)"(since 3.5.3), "auto(number)" (since 5.0.6) or "none".

If "client" or "client(number)" is specified, the sort functionality will be done by Javascript at client without notifying to server, that is, the order of the component in the row is out of sync.

• "client" : it is treated by a string
• "client(number)" : it is treated by a number

Note: client sorting cannot work in model case. (since 5.0.0)

If "auto" is specified, setSortAscending(java.util.Comparator) and/or setSortDescending(java.util.Comparator) are called with ListitemComparator, if getSortDescending() and/or getSortAscending() are null. If you assigned a comparator to them, it won't be affected. The auto created comparator is case-insensitive.

If "auto(FIELD_NAME1, FIELD_NAME2, ...)" is specified, setSortAscending(java.util.Comparator) and/or setSortDescending(java.util.Comparator) are called with FieldComparator, if getSortDescending() and/or getSortAscending() are null. If you assigned a comparator to them, it won't be affected. The auto created comparator is case-sensitive.

If "auto(LOWER(FIELD_NAME))" or "auto(UPPER(FIELD_NAME))" is specified, setSortAscending(java.util.Comparator) and/or setSortDescending(java.util.Comparator) are called with FieldComparator, if getSortDescending() and/or getSortAscending() are null. If you assigned a comparator to them, it won't be affected. The auto created comparator is case-insensitive.

If "auto(number)" is specified, setSortAscending(java.util.Comparator) and/or setSortDescending(java.util.Comparator) are called with ArrayComparator. Notice that the data must be an array and the number-th element must be comparable (Comparable).

If "none" is specified, both setSortAscending(java.util.Comparator) and setSortDescending(java.util.Comparator) are called with null. Therefore, no more sorting is available to users for this column.

getSortAscending

public java.util.Comparator getSortAscending()

Returns the ascending sorter, or null if not available.

setSortAscending

public void setSortAscending(java.util.Comparator sorter)

Sets the ascending sorter, or null for no sorter for the ascending order.

Parameters:

sorter - the comparator used to sort the ascending order. If you are using the group feature, you can pass an instance of GroupComparator to have a better control. If an instance of GroupComparator is passed, GroupComparator.compareGroup(D, D) is used to group elements, and Comparator.compare(T, T) is used to sort elements with a group. Otherwise, Comparator.compare(T, T) is used to group elements and sort elements within a group.

setSortAscending

public void setSortAscending(java.lang.String clsnm)
                      throws java.lang.ClassNotFoundException,
                             java.lang.InstantiationException,
                             java.lang.IllegalAccessException

Sets the ascending sorter with the class name, or null for no sorter for the ascending order.

Throws:

java.lang.ClassNotFoundException

java.lang.InstantiationException

java.lang.IllegalAccessException

getSortDescending

public java.util.Comparator getSortDescending()

Returns the descending sorter, or null if not available.

setSortDescending

public void setSortDescending(java.util.Comparator sorter)

Sets the descending sorter, or null for no sorter for the descending order.

Parameters:

sorter - the comparator used to sort the ascending order. If you are using the group feature, you can pass an instance of GroupComparator to have a better control. If an instance of GroupComparator is passed, GroupComparator.compareGroup(D, D) is used to group elements, and Comparator.compare(T, T) is used to sort elements with a group. Otherwise, Comparator.compare(T, T) is used to group elements and sort elements within a group.

setSortDescending

public void setSortDescending(java.lang.String clsnm)
                       throws java.lang.ClassNotFoundException,
                              java.lang.InstantiationException,
                              java.lang.IllegalAccessException

Sets the descending sorter with the class name, or null for no sorter for the descending order.

Throws:

java.lang.ClassNotFoundException

java.lang.InstantiationException

java.lang.IllegalAccessException

getMaxlength

public int getMaxlength()

Returns the maximal length of each item's label.

Default: 0 (no limit).

setMaxlength

public void setMaxlength(int maxlength)

Sets the maximal length of each item's label.

Default: 0 (no limit).

Notice that maxlength will be applied to this header and all listcell of the same column.

getColumnIndex

public int getColumnIndex()

Returns the column index, starting from 0.

sort

public boolean sort(boolean ascending)

Sorts the list items based on getSortAscending() and getSortDescending(), if getSortDirection() doesn't matches the ascending argument.

It checks getSortDirection() to see whether sorting is required, and update setSortDirection(java.lang.String) after sorted. For example, if getSortDirection() returns "ascending" and the ascending argument is false, nothing happens. To enforce the sorting, you can invoke setSortDirection(java.lang.String) with "natural" before invoking this method. Alternatively, you can invoke sort(boolean, boolean) instead.

It sorts the listitem by use of Components.sort(java.util.List<? extends org.zkoss.zk.ui.Component>, java.util.Comparator<? super org.zkoss.zk.ui.Component>) data (i.e., Grid.getModel() is null).

On the other hand, it invokes Sortable.sort(java.util.Comparator<T>, boolean) to sort the list item, if live data (i.e., Listbox.getModel() is not null). In other words, if you use the live data, you have to implement Sortable to sort the live data explicitly.

Parameters:

ascending - whether to use getSortAscending(). If the corresponding comparator is not set, it returns false and does nothing.

Returns:

whether the list items are sorted.

Throws:

UiException - if Listbox.getModel() is not null but Sortable is not implemented.

group

public boolean group(boolean ascending)

Groups and sorts the items (Listitem) based on getSortAscending(). If the corresponding comparator is not set, it returns false and does nothing.

Parameters:

ascending - whether to use getSortAscending(). If the corresponding comparator is not set, it returns false and does nothing.

Returns:

whether the rows are grouped.

Since:

6.5.0

sort

public boolean sort(boolean ascending,
           boolean force)

Sorts the list items based on getSortAscending() and getSortDescending().

Parameters:

ascending - whether to use getSortAscending(). If the corresponding comparator is not set, it returns false and does nothing.

force - whether to enforce the sorting no matter what the sort direction (getSortDirection()) is. If false, this method is the same as sort(boolean).

Returns:

whether the rows are sorted.

onSort

public void onSort(SortEvent event)

Invokes a sorting action based on a SortEvent and maintains getSortDirection().

Since:

6.5.0

onSort

public void onSort()

Deprecated. As of release 6.5.0, use or override onSort(SortEvent) instead.

It invokes sort(boolean) to sort list items and maintain getSortDirection().

onGroupLater

public void onGroupLater(SortEvent event)

Internal use only.

Since:

6.5.0

ungroup

public void ungroup(boolean ascending)

Ungroups and sorts the items (Listitem) based on the ascending. If the corresponding comparator is not set, it returns false and does nothing.

Parameters:

ascending - whether to use getSortAscending(). If the corresponding comparator is not set, it returns false and does nothing.

Since:

6.5.0

getZclass

public java.lang.String getZclass()

Description copied from class: HtmlBasedComponent

Returns the ZK Cascading Style class(es) for this component. It usually depends on the implementation of the mold (AbstractComponent.getMold()).

Default: null (the default value depends on element).

HtmlBasedComponent.setZclass(java.lang.String)) will completely replace the default style of a component. In other words, the default style of a component is associated with the default value of HtmlBasedComponent.getZclass(). Once it is changed, the default style won't be applied at all. If you want to perform small adjustments, use HtmlBasedComponent.setSclass(java.lang.String) instead.

Overrides:

getZclass in class HtmlBasedComponent

See Also:

HtmlBasedComponent.getSclass()

beforeParentChanged

public void beforeParentChanged(Component parent)

Description copied from class: AbstractComponent

Default: does nothing.

Specified by:

beforeParentChanged in interface ComponentCtrl

Overrides:

beforeParentChanged in class AbstractComponent

Parameters:

parent - the new parent. If null, it means detachment.

See Also:

ComponentCtrl.beforeParentChanged(org.zkoss.zk.ui.Component)

service

public void service(AuRequest request,
           boolean everError)

Processes an AU request.

Default: in addition to what are handled by its superclass, it also handles onSort.

Specified by:

service in interface ComponentCtrl

Overrides:

service in class HtmlBasedComponent

everError - whether any error ever occurred before processing this request.

Since:

6.5.0

See Also:

AbstractComponent.setAuService(org.zkoss.zk.au.AuService)

renderProperties

protected void renderProperties(ContentRenderer renderer)
                         throws java.io.IOException

Description copied from class: HtmlBasedComponent

Renders the content of this component, excluding the enclosing tags and children.

See also ZK Client-side Reference: Property Rendering

Overrides:

renderProperties in class HeaderElement

Throws:

java.io.IOException

clone

public java.lang.Object clone()

Description copied from interface: Component

Clones the component. All of its children and descendants are cloned. Also, ID are preserved.

Specified by:

clone in interface Component

Overrides:

clone in class LabelImageElement

Returns:

the new component. Notice that it doesn't belong to any page, nor desktop. It doesn't have a parent, either.

updateByClient

protected void updateByClient(java.lang.String name,
                  java.lang.Object value)

Description copied from class: AbstractComponent

Called when the widget running at the client asks the server to update a value. The update is caused by an AU request named setAttr (by invoking zk.Widget's smartUpdate at client).

By default, it does nothing but log a warning message, since it is not safe to allow the client to update a field arbitrary.

However, if you'd like to allow the update for a particular component you could do one of the following

1. For component developers: override this method to update the field directly. For example,
   

   protected void updateByClient(String name, Object value) {
           if ("disabled".equals(name))
                   setDisabled(name, ((Boolean)value).booleanValue());
           else
                   super.updateByClient(name, value);

2. For application developers: set an attribute called org.zkoss.zk.ui.updateByClient to be true. Then, this method will use reflection to find out the setter to update the value. Nothing happens if the method is not found.

Notice: this method will invoke AbstractComponent.disableClientUpdate(boolean) to disable any update to the client, when calling the setter.

If you want to enable the client update for all instances of a given component (though not recommended for the security reason), you could refer to here.

See also zk.Widget.smartUpdate().

Overrides:

updateByClient in class AbstractComponent