Package 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, org.zkoss.zk.ui.Component, org.zkoss.zk.ui.ext.Scope, org.zkoss.zk.ui.sys.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

org.zkoss.zk.ui.AbstractComponent.Children, org.zkoss.zk.ui.AbstractComponent.ForwardInfo, org.zkoss.zk.ui.AbstractComponent.TargetInfo

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

AFTER_CHILD_ADDED, AFTER_CHILD_REMOVED, AFTER_CLONED, AFTER_PAGE_ATTACHED, AFTER_PAGE_DETACHED, AFTER_PARENT_CHANGED, CE_BUSY_IGNORE, CE_DUPLICATE_IGNORE, CE_IMPORTANT, CE_NON_DEFERRABLE, CE_REPEAT_IGNORE

Constructor Summary

Constructors

Constructor	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

Modifier and Type	Method	Description
void	beforeParentChanged(org.zkoss.zk.ui.Component parent)
java.lang.Object	clone()
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()
boolean	group(boolean ascending)	Groups and sorts the items (Listitem) based on getSortAscending().
void	onGroupLater(org.zkoss.zk.ui.event.SortEvent event)	Internal use only.
void	onSort(org.zkoss.zk.ui.event.SortEvent event)	Invokes a sorting action based on a SortEvent and maintains getSortDirection().
protected void	renderProperties(org.zkoss.zk.ui.sys.ContentRenderer renderer)
void	service(org.zkoss.zk.au.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.lang.String clsnm)	Sets the ascending sorter with the class name, or null for no sorter for the ascending order.
void	setSortAscending(java.util.Comparator sorter)	Sets the ascending sorter, or null for no sorter for the ascending 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	setSortDescending(java.util.Comparator sorter)	Sets the descending sorter, 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)

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

evalCSSFlex, getAlign, getValign, setAlign, setValign

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

getExtraCtrl, getHoverImage, getHoverImageContent, getIconSclass, getIconSclasses, getIconTooltip, getIconTooltips, getImage, getImageContent, getPropertyAccess, isImageAssigned, setHoverImage, setHoverImageContent, setHoverImageContent, setIconSclass, setIconSclasses, setIconTooltip, setIconTooltips, setImage, setImageContent, setImageContent

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, setContextAttributes, setCtrlKeys, setPopup, setPopup, setPopupAttributes, setTooltip, setTooltip, setTooltipAttributes

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

addSclass, focus, getAction, getClientAction, getDraggable, getDroppable, getHeight, getHflex, getLeft, getRenderdefer, getSclass, getStyle, getTabindex, getTabindexInteger, getTooltiptext, getTop, getVflex, getWidth, getZindex, getZIndex, removeSclass, removeSclass, setAction, setClass, setClientAction, setDraggable, setDroppable, setFocus, setHeight, setHeight0, setHeightDirectly, setHflex, setHflex0, setHflexDirectly, setLeft, setLeftDirectly, setRenderdefer, setSclass, setStyle, setTabindex, setTabindex, setTooltiptext, setTop, setTopDirectly, setVflex, setVflex0, setVflexDirectly, setWidth, setWidth0, setWidthDirectly, setZclass, setZindex, setZIndex, setZIndexDirectly

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

addAnnotation, addCallback, addClientEvent, addEventHandler, addEventListener, addEventListener, addForward, addForward, addForward, addForward, addMoved, addRedrawCallback, addScopeListener, addShadowRoot, addShadowRootBefore, addSharedEventHandlerMap, appendChild, applyProperties, beforeChildAdded, beforeChildRemoved, destroyIndexCacheMap, detach, didActivate, didActivate, didDeserialize, didDeserialize, disableBindingAnnotation, disableClientUpdate, disableHostChanged, enableBindingAnnotation, enableHostChanged, getAnnotatedProperties, getAnnotatedPropertiesBy, getAnnotation, getAnnotations, getAnnotations, getAttribute, getAttribute, getAttribute, getAttributeOrFellow, getAttributes, getAttributes, getAuService, getAutag, getCallback, getChildren, getClientAttribute, getClientDataAttribute, getClientEvents, getDefaultMold, getDefinition, getDesktop, getEventHandler, getEventHandlerNames, getEventListenerMap, getEventListeners, getFellow, getFellow, getFellowIfAny, getFellowIfAny, getFellows, getFirstChild, getForwards, getId, getIndexCacheMap, getLastChild, getMold, getNextSibling, getPage, getParent, getPreviousSibling, getRedrawCallback, getRoot, getShadowFellowIfAny, getShadowRoots, getShadowVariable, getShadowVariable, getShadowVariable0, getSpaceOwner, getSpecialRendererOutput, getStubonly, getSubBindingAnnotationCount, getTemplate, getTemplateNames, getUuid, getWidgetAttributeNames, getWidgetClass, getWidgetListener, getWidgetListenerNames, getWidgetOverride, getWidgetOverrideNames, hasAttribute, hasAttribute, hasAttribute, hasAttributeOrFellow, hasBindingAnnotation, hasFellow, hasFellow, hasSubBindingAnnotation, initIndexCacheMap, insertBefore, invalidate, isChildable, isDisabledHostChanged, isInitialized, isInvalidated, isListenerAvailable, isVisible, onChildAdded, onChildRemoved, onPageAttached, onPageDetached, onParentChanged, onWrongValue, query, queryAll, redraw, redrawChildren, removeAttribute, removeAttribute, removeAttribute, removeCallback, removeChild, removeEventListener, removeForward, removeForward, removeRedrawCallback, removeScopeListener, removeShadowRoot, render, render, render, renderPropertiesOnly, 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, 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

equals, 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 org.zkoss.zk.ui.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:

org.zkoss.zk.ui.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:

org.zkoss.zk.ui.UiException - if Listbox.getModel() is not null but Sortable is not implemented.

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.

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

onSort

public void onSort(org.zkoss.zk.ui.event.SortEvent event)

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

Since:

6.5.0

onGroupLater

public void onGroupLater(org.zkoss.zk.ui.event.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()

Overrides:

getZclass in class org.zkoss.zk.ui.HtmlBasedComponent

beforeParentChanged

public void beforeParentChanged(org.zkoss.zk.ui.Component parent)

Specified by:

beforeParentChanged in interface org.zkoss.zk.ui.sys.ComponentCtrl

Overrides:

beforeParentChanged in class org.zkoss.zk.ui.AbstractComponent

service

public void service(org.zkoss.zk.au.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 org.zkoss.zk.ui.sys.ComponentCtrl

Overrides:

service in class org.zkoss.zk.ui.HtmlBasedComponent

Since:

6.5.0

renderProperties

protected void renderProperties(org.zkoss.zk.ui.sys.ContentRenderer renderer)
                         throws java.io.IOException

Overrides:

renderProperties in class HeaderElement

Throws:

java.io.IOException

clone

public java.lang.Object clone()

Specified by:

clone in interface org.zkoss.zk.ui.Component

Overrides:

clone in class LabelImageElement

updateByClient

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

Overrides:

updateByClient in class org.zkoss.zk.ui.AbstractComponent