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, HtmlBasedComponent, Component, Scope, ComponentCtrl, Listheader, HeaderElement, LabelElement, LabelImageElement, XulElement

public class Listheader
extends HeaderElement
implements Listheader

The list header which defines the attributes and header of a columen 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-list-header.(since 3.5.0)

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, RS_NO_DISPLAY, RS_NO_HEIGHT, RS_NO_WIDTH

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

_visible

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

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

Constructor Summary

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

java.lang.Object	clone() Clones the component.
java.lang.String	getColumnHtmlPrefix() Returns the prefix of the first column (in HTML tags), null if this is not first column.
int	getColumnIndex() Returns the column index, starting from 0.
Listbox	getListbox() Returns the listbox that this belongs to.
Listbox	getListboxApi() Returns the listbox that this belongs to.
int	getMaxlength() Returns the maximal length of each item's label.
java.lang.String	getOuterAttrs() Returns the exterior attributes for generating the enclosing HTML tag; never return null.
protected java.lang.String	getRealSclass() Returns the real style class that will be generated to the client (when HtmlBasedComponent.getOuterAttrs() is called).
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.
java.lang.Object	getValue() Returns the value.
java.lang.String	getZclass() Returns the ZK Cascading Style class(es) for this component.
protected void	invalidateWhole() Invalidates the whole box.
void	onSort() It invokes sort(boolean) to sort list items and maintain getSortDirection().
void	setMaxlength(int maxlength) Sets the maximal length of each item's label.
void	setParent(Component parent) Sets the parent component.
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.
void	setValue(java.lang.Object 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().

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

getAlign, getColAttrs, getValign, setAlign, setValign, setVisible

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

getEncodedImageURL, getHoverImage, getImage, getImageContent, getImgTag, getImgTag, getSrc, isImageAssigned, newExtraCtrl, setHoverImage, setHoverImageContent, setHoverImageContent, setImage, setImageContent, setImageContent, setSrc

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

getLabel, setLabel

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

getAction, getActionAttrs, getAllOnClickAttrs, getContext, getCtrlKeys, getInnerAttrs, getPopup, getTooltip, setAction, setContext, setContext, setCtrlKeys, setPopup, setPopup, setTooltip, setTooltip

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

focus, getAllOnClickAttrs, getDraggable, getDroppable, getHeight, getLeft, getMoldSclass, getRealStyle, getRealStyleFlags, getSclass, getStyle, getTooltiptext, getTop, getWidth, getZindex, getZIndex, redraw, setClass, setDraggable, setDroppable, setFocus, setHeight, setLeft, setMoldSclass, setSclass, setStyle, setTooltiptext, setTop, setWidth, setZclass, setZindex, setZIndex

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

addAnnotation, addAnnotation, addEventHandler, addEventListener, addForward, addForward, addForward, addForward, addMoved, addSharedAnnotationMap, addSharedEventHandlerMap, appendAsapAttr, appendAsapAttr, appendChild, applyProperties, containsVariable, detach, equals, getAnnotatedProperties, getAnnotatedPropertiesBy, getAnnotation, getAnnotation, getAnnotations, getAnnotations, getAttribute, getAttribute, getAttributes, getAttributes, getChildren, getCommand, getDefinition, getDesktop, getEventHandler, getEventHandlerNames, getExtraCtrl, getFellow, getFellowIfAny, getFellows, getFirstChild, getId, getLastChild, getListenerIterator, getMold, getMoldURI, getNamespace, getNextSibling, getPage, getParent, getPreviousSibling, getRoot, getSpaceOwner, getUuid, getVariable, hasFellow, insertBefore, invalidate, isAsapRequired, isChildable, isInvalidated, isListenerAvailable, isVisible, newChildren, onChildAdded, onChildRemoved, onDrawNewChild, onPageAttached, onPageDetached, onWrongValue, removeAttribute, removeAttribute, removeChild, removeEventListener, removeForward, removeForward, response, sessionDidActivate, sessionWillPassivate, setAttribute, setAttribute, setComponentDefinition, setId, setMold, setPage, setPageBefore, setVariable, smartUpdate, smartUpdate, smartUpdate, smartUpdateDeferred, smartUpdateValues, toString, unsetVariable

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.zkoss.zul.impl.api.HeaderElement

getAlign, getValign, setAlign, setValign

Methods inherited from interface org.zkoss.zul.impl.api.LabelImageElement

getHoverImage, getImage, getImageContent, setHoverImage, setHoverImageContent, setHoverImageContent, setImage, setImageContent, setImageContent

Methods inherited from interface org.zkoss.zul.impl.api.LabelElement

getLabel, setLabel

Methods inherited from interface org.zkoss.zul.impl.api.XulElement

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

Methods inherited from interface org.zkoss.zk.ui.api.HtmlBasedComponent

focus, getHeight, getLeft, getSclass, getStyle, getTooltiptext, getTop, getWidth, getZindex, getZIndex, setDraggable, setDroppable, setFocus, setHeight, setLeft, setSclass, setStyle, setTooltiptext, setTop, setWidth, setZclass, setZindex, setZIndex

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

addEventListener, addForward, addForward, addForward, addForward, appendChild, applyProperties, containsVariable, detach, getAttribute, getAttribute, getAttributes, getAttributes, getChildren, getDefinition, getDesktop, getFellow, getFellowIfAny, getFellows, getFirstChild, getId, getLastChild, getListenerIterator, getMold, getNamespace, getNextSibling, getPage, getParent, getPreviousSibling, getRoot, getSpaceOwner, getUuid, getVariable, insertBefore, invalidate, isChildable, isInvalidated, isListenerAvailable, isVisible, redraw, removeAttribute, removeAttribute, removeChild, removeEventListener, removeForward, removeForward, setAttribute, setAttribute, setId, setMold, setPage, setPageBefore, setVariable, setVisible, unsetVariable

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.

getListboxApi

public Listbox getListboxApi()

Returns the listbox that this belongs to.

Specified by:

getListboxApi in interface Listheader

Since:

3.5.2

getValue

public java.lang.Object 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 void setValue(java.lang.Object 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".

Specified by:

getSortDirection in interface Listheader

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.

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 manaully.

Specified by:

setSortDirection in interface Listheader

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 3.6.0) or "none".

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-insensitive.

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.

Specified by:

setSort in interface Listheader

getSortAscending

public java.util.Comparator getSortAscending()

Returns the ascending sorter, or null if not available.

Specified by:

getSortAscending in interface Listheader

setSortAscending

public void setSortAscending(java.util.Comparator sorter)

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

Specified by:

setSortAscending in interface Listheader

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(java.lang.Object, java.lang.Object) is used to group elements, and Comparator.compare(java.lang.Object, java.lang.Object) is used to sort elements with a group. Otherwise, Comparator.compare(java.lang.Object, java.lang.Object) 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.

Specified by:

setSortAscending in interface Listheader

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.

Specified by:

getSortDescending in interface Listheader

setSortDescending

public void setSortDescending(java.util.Comparator sorter)

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

Specified by:

setSortDescending in interface Listheader

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(java.lang.Object, java.lang.Object) is used to group elements, and Comparator.compare(java.lang.Object, java.lang.Object) is used to sort elements with a group. Otherwise, Comparator.compare(java.lang.Object, java.lang.Object) 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.

Specified by:

setSortDescending in interface Listheader

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).

Specified by:

getMaxlength in interface Listheader

setMaxlength

public void setMaxlength(int maxlength)

Sets the maximal length of each item's label.

Specified by:

setMaxlength in interface Listheader

getColumnIndex

public int getColumnIndex()

Returns the column index, starting from 0.

Specified by:

getColumnIndex in interface Listheader

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, java.util.Comparator) data (i.e., Grid.getModel() is null).

On the other hand, it invokes ListModelExt.sort(java.util.Comparator, 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 ListModelExt to sort the live data explicitly.

Specified by:

sort in interface Listheader

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 ListModelExt is not implemented.

sort

public boolean sort(boolean ascending,
                    boolean force)

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

Specified by:

sort in interface Listheader

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()

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

getRealSclass

protected java.lang.String getRealSclass()

Description copied from class: HtmlBasedComponent

Returns the real style class that will be generated to the client (when HtmlBasedComponent.getOuterAttrs() is called).

Default: it simply returns the catenation of HtmlBasedComponent.getSclass() and HtmlBasedComponent.getZclass() (since 3.5.0).

Derived classes might override it to provide, say, dual style classes. For example,

final String sclass = getSclass();
return sclass != null ? sclass + " my-addon": "myaddon";

Overrides:

getRealSclass in class HtmlBasedComponent

See Also:

HtmlBasedComponent.getZclass()

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 (@{link #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.

Specified by:

getZclass in interface HtmlBasedComponent

Overrides:

getZclass in class HtmlBasedComponent

See Also:

HtmlBasedComponent.getSclass(), HtmlBasedComponent.getRealSclass()

getOuterAttrs

public java.lang.String getOuterAttrs()

Description copied from class: HtmlBasedComponent

Returns the exterior attributes for generating the enclosing HTML tag; never return null.

Used only by component developers.

Default: Generates the tooltip text, style, sclass, draggable and droppable attribute if necessary. In other words, the corresponding attribute is generated if HtmlBasedComponent.getTooltiptext(), HtmlBasedComponent.getRealStyle(), HtmlBasedComponent.getSclass(), HtmlBasedComponent.getDraggable(), HtmlBasedComponent.getDroppable() are defined.

You have to call both HtmlBasedComponent.getOuterAttrs() and HtmlBasedComponent.getInnerAttrs() to generate complete attributes.

For simple components that all attributes are put on the outest HTML element, all you need is as follows.

<xx id="${self.uuid}"${self.outerAttrs}${self.innerAttrs}>

If you want to put attributes in a nested HTML element, you shall use the following pattern. Notice: if HtmlBasedComponent.getInnerAttrs() in a different tag, the tag must be named with "${self.uuid}!real".

<xx id="${self.uuid}"${self.outerAttrs}>
 <yy id="${self.uuid}!real"${self.innerAttrs}>...

Note: This class handles non-deferrable event listeners automatically. However, you have to invoke AbstractComponent.appendAsapAttr(java.lang.StringBuffer, java.lang.String) for each event the component handles in HtmlBasedComponent.getOuterAttrs() as follows.

        appendAsapAttr(sb, Events.ON_OPEN);
  appendAsapAttr(sb, Events.ON_CHANGE);

Theorectically, you could put any attributes in either HtmlBasedComponent.getInnerAttrs() or HtmlBasedComponent.getOuterAttrs(). However, zkau.js assumes all attributes are put at the outer one. If you want something different, you have to provide your own setAttr (refer to how checkbox is implemented).

Overrides:

getOuterAttrs in class HeaderElement

getColumnHtmlPrefix

public java.lang.String getColumnHtmlPrefix()

Returns the prefix of the first column (in HTML tags), null if this is not first column. Called only by listheader.dsp.

Since:

3.0.1

invalidateWhole

protected void invalidateWhole()

Invalidates the whole box.

Specified by:

invalidateWhole in class HeaderElement

setParent

public void setParent(Component parent)

Description copied from interface: Component

Sets the parent component.

Note: Component.setParent(org.zkoss.zk.ui.Component) always calls back Component.insertBefore(org.zkoss.zk.ui.Component, org.zkoss.zk.ui.Component) and/or Component.removeChild(org.zkoss.zk.ui.Component), while Component.insertBefore(org.zkoss.zk.ui.Component, org.zkoss.zk.ui.Component) and Component.removeChild(org.zkoss.zk.ui.Component) always calls back Component.setParent(org.zkoss.zk.ui.Component), if the parent is changed. Thus, you don't need to override both Component.insertBefore(org.zkoss.zk.ui.Component, org.zkoss.zk.ui.Component) and Component.setParent(org.zkoss.zk.ui.Component), if you want to customize the behavior.

Specified by:

setParent in interface Component

Overrides:

setParent in class AbstractComponent

clone

public java.lang.Object clone()

Description copied from interface: Component

Clones the component. All of its children is cloned. Notice that the cloned component doesn't belong to any page, nor desktop. It doesn't have parent, either.

Specified by:

clone in interface Component

Overrides:

clone in class AbstractComponent