org.zkoss.zul
Class Image

java.lang.Object
  org.zkoss.zk.ui.AbstractComponent
      org.zkoss.zk.ui.HtmlBasedComponent
          org.zkoss.zul.impl.XulElement
              org.zkoss.zul.Image

All Implemented Interfaces:

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

Direct Known Subclasses:

Captcha, Imagemap

public class Image
extends XulElement

An image.

[Since 6.0.0]

To turn on the preload image function for this component, you have to specify the component's attribute map with key "org.zkoss.zul.image.preload" to true. That is, for example, if in a zul file, you shall specify <custom-attributes> of the component like this:

 <image ...>
     <custom-attributes org.zkoss.zul.image.preload='true'/>
 </image>
 

Or specify it onto the root component. For example,

 <window ...>
     <custom-attributes org.zkoss.zul.image.preload="true"/>
     <image .../>
 </window>
 

[Since 6.5.2]

Preload image function is also configurable from zk.xml by setting library properties. For example,

 <library-property/>
     <name>org.zkoss.zul.image.preload</name/>
     <value>true</value/>
 </library-property/>
 

See also how to fix the alpha transparency problem of PNG files found in IE6?

Author:

tomyeh

See Also:

Serialized Form

Nested Class Summary

protected class

Image.ExtraCtrl A utility class to implement HtmlBasedComponent.getExtraCtrl().

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

Image()

Image(java.lang.String src)

Method Summary

java.lang.String	getAlign() Deprecated. as of release 6.0.0, use CSS instead.
java.lang.String	getBorder() Deprecated. As of release 5.0.5, use CSS instead.
Image	getContent() Returns the content set by setContent(org.zkoss.image.Image).
java.lang.Object	getExtraCtrl() Returns the client control for this component.
java.lang.String	getHover() Returns the URI of the hover image.
java.lang.String	getHspace() Deprecated. as of release 6.0.0, use CSS instead.
java.lang.String	getSrc() Returns the source URI of the image.
java.lang.String	getVspace() Deprecated. as of release 6.0.0, use CSS instead.
protected boolean	isChildable() Default: not childable.
protected void	renderProperties(ContentRenderer renderer) Renders the content of this component, excluding the enclosing tags and children.
void	setAlign(java.lang.String align) Deprecated. as of release 6.0.0, use CSS instead.
void	setBorder(java.lang.String border) Deprecated. As of release 5.0.5, use CSS instead.
void	setContent(Image image) Sets the content directly.
void	setContent(java.awt.image.RenderedImage image) Sets the content directly with the rendered image.
void	setHover(java.lang.String src) Sets the image URI.
void	setHoverContent(Image image) Sets the content of the hover image directly.
void	setHoverContent(java.awt.image.RenderedImage image) Sets the content of the hover image directly with the rendered image.
void	setHspace(java.lang.String hspace) Deprecated. as of release 6.0.0, use CSS instead.
void	setSrc(java.lang.String src) Sets the source URI of the image.
void	setVspace(java.lang.String vspace) Deprecated. as of release 6.0.0, use CSS instead.

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

clone, 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, getZclass, getZindex, getZIndex, service, 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, addScopeListener, addSharedEventHandlerMap, appendChild, applyProperties, beforeChildAdded, beforeChildRemoved, beforeParentChanged, detach, didActivate, didActivate, didDeserialize, didDeserialize, disableClientUpdate, equals, getAnnotatedProperties, getAnnotatedPropertiesBy, getAnnotation, getAnnotation, getAnnotations, getAnnotations, getAnnotations, getAttribute, getAttribute, getAttribute, getAttributeOrFellow, getAttributes, getAttributes, getAuService, getAutag, getChildren, getClientEvents, getDefaultMold, getDefinition, getDesktop, getEventHandler, getEventHandlerNames, getEventListenerMap, getEventListeners, getFellow, getFellow, getFellowIfAny, getFellowIfAny, getFellows, getFirstChild, getId, getLastChild, getListenerIterator, getMold, getNextSibling, getPage, getParent, getPreviousSibling, getRoot, getSpaceOwner, getStubonly, getTemplate, getTemplateNames, getUuid, getWidgetAttribute, getWidgetAttributeNames, getWidgetClass, getWidgetListener, getWidgetListenerNames, getWidgetOverride, getWidgetOverrideNames, hasAttribute, hasAttribute, hasAttribute, hasAttributeOrFellow, hasFellow, hasFellow, insertBefore, invalidate, isInvalidated, isListenerAvailable, isVisible, onChildAdded, onChildRemoved, onPageAttached, onPageDetached, onWrongValue, query, queryAll, redraw, redrawChildren, removeAttribute, removeAttribute, removeAttribute, removeChild, removeEventListener, removeForward, removeForward, removeScopeListener, render, render, render, replace, response, response, response, service, sessionDidActivate, sessionWillPassivate, setAttribute, setAttribute, setAttribute, setAuService, setAutag, setDefinition, setDefinition, setId, setMold, setPage, setPageBefore, setParent, setStubonly, setStubonly, setTemplate, setVisible, setVisibleDirectly, setWidgetAttribute, setWidgetClass, setWidgetListener, setWidgetOverride, smartUpdate, smartUpdate, smartUpdate, smartUpdate, smartUpdate, smartUpdate, smartUpdate, smartUpdate, smartUpdate, smartUpdateWidgetListener, smartUpdateWidgetOverride, toString, updateByClient, willPassivate, willPassivate, willSerialize, willSerialize

Methods inherited from class java.lang.Object

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

Constructor Detail

Image

public Image()

Image

public Image(java.lang.String src)

Method Detail

getAlign

public java.lang.String getAlign()

Deprecated. as of release 6.0.0, use CSS instead.

Returns the alignment.

Default: null (use browser default).

setAlign

public void setAlign(java.lang.String align)

Deprecated. as of release 6.0.0, use CSS instead.

Sets the alignment: one of top, texttop, middle, absmiddle, bottom, absbottom, baseline, left, right and center.

getBorder

public java.lang.String getBorder()

Deprecated. As of release 5.0.5, use CSS instead.

setBorder

public void setBorder(java.lang.String border)

Deprecated. As of release 5.0.5, use CSS instead.

getHspace

public java.lang.String getHspace()

Deprecated. as of release 6.0.0, use CSS instead.

Returns number of pixels of extra space to the left and right side of the image.

Default: null (use browser default).

setHspace

public void setHspace(java.lang.String hspace)

Deprecated. as of release 6.0.0, use CSS instead.

Sets number of pixels of extra space to the left and right side of the image.

getVspace

public java.lang.String getVspace()

Deprecated. as of release 6.0.0, use CSS instead.

Returns number of pixels of extra space to the top and bottom side of the image.

Default: null (use browser default).

setVspace

public void setVspace(java.lang.String vspace)

Deprecated. as of release 6.0.0, use CSS instead.

Sets number of pixels of extra space to the top and bottom side of the image.

getSrc

public java.lang.String getSrc()

Returns the source URI of the image.

Default: null.

setSrc

public void setSrc(java.lang.String src)

Sets the source URI of the image.

Calling this method implies setContent(null). In other words, the last invocation of setSrc(java.lang.String) overrides the previous setContent(org.zkoss.image.Image), if any.

Parameters:

src - the URI of the image source

See Also:

setContent(org.zkoss.image.Image), setContent(RenderedImage)

setContent

public void setContent(Image image)

Sets the content directly.

Default: null.

Calling this method implies setSrc(null). In other words, the last invocation of setContent(org.zkoss.image.Image) overrides the previous setSrc(java.lang.String), if any.

Parameters:

image - the image to display.

See Also:

setSrc(java.lang.String)

setContent

public void setContent(java.awt.image.RenderedImage image)

Sets the content directly with the rendered image. It actually encodes the rendered image to an PNG image (Image) with Images.encode(java.lang.String, java.awt.image.RenderedImage, float, boolean), and then invoke setContent(org.zkoss.image.Image).

If you want more control such as different format, quality, and naming, you can use Images directly.

Since:

3.0.7

getContent

public Image getContent()

Returns the content set by setContent(org.zkoss.image.Image).

Note: it won't fetch what is set thru by setSrc(java.lang.String). It simply returns what is passed to setContent(org.zkoss.image.Image).

getHover

public java.lang.String getHover()

Returns the URI of the hover image. The hover image is used when the mouse is moving over this component.

Default: null.

Since:

3.5.0

setHover

public void setHover(java.lang.String src)

Sets the image URI. The hover image is used when the mouse is moving over this component.

Calling this method implies setHoverContent(null). In other words, the last invocation of setHover(java.lang.String) overrides the previous setHoverContent(org.zkoss.image.Image), if any.

Since:

3.5.0

See Also:

setHoverContent(org.zkoss.image.Image), setHoverContent(RenderedImage)

setHoverContent

public void setHoverContent(Image image)

Sets the content of the hover image directly. The hover image is used when the mouse is moving over this component.

Default: null.

Calling this method implies setHover(null). In other words, the last invocation of setHoverContent(org.zkoss.image.Image) overrides the previous setHover(java.lang.String), if any.

Parameters:

image - the image to display.

Since:

3.5.0

See Also:

setHover(java.lang.String)

setHoverContent

public void setHoverContent(java.awt.image.RenderedImage image)

Sets the content of the hover image directly with the rendered image. The hover image is used when the mouse is moving over this component.

It actually encodes the rendered image to an PNG image (Image) with Images.encode(java.lang.String, java.awt.image.RenderedImage, float, boolean), and then invoke setHoverContent(org.zkoss.image.Image).

If you want more control such as different format, quality, and naming, you can use Images directly.

Since:

3.5.0

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 XulElement

Throws:

java.io.IOException

isChildable

protected boolean isChildable()

Default: not childable.

Overrides:

isChildable in class AbstractComponent

getExtraCtrl

public java.lang.Object getExtraCtrl()

Description copied from class: HtmlBasedComponent

Returns the client control for this component. It is used only by component developers.

Default: creates an instance of HtmlBasedComponent.ExtraCtrl.

Specified by:

getExtraCtrl in interface ComponentCtrl

Overrides:

getExtraCtrl in class HtmlBasedComponent

Returns:

null if no special handling required. If the component requires some special controls, it could return an object that implements one or several interfaces in the org.zkoss.zk.ui.ext.render package. For example, Cropper.

See Also:

ComponentCtrl.getExtraCtrl()