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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<div class="navpath"><a class="el" href="namespaceWt.html">Wt</a>::<a class="el" href="classWt_1_1WImage.html">WImage</a>
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<h1>Wt::WImage Class Reference</h1><!-- doxytag: class="Wt::WImage" --><!-- doxytag: inherits="Wt::WInteractWidget" -->A widget that displays an image.
<a href="#_details">More...</a>
<p>
<code>#include <Wt/WImage></code>
<p>
<div class="dynheader">
Inheritance diagram for Wt::WImage:</div>
<div class="dynsection">
<p><center><img src="classWt_1_1WImage__inherit__graph.png" border="0" usemap="#Wt_1_1WImage__inherit__map" alt="Inheritance graph"></center>
<map name="Wt_1_1WImage__inherit__map">
<area shape="rect" href="classWt_1_1WInteractWidget.html" title="An abstract widget that can receive user-interface interaction." alt="" coords="5,229,147,256"><area shape="rect" href="classWt_1_1WWebWidget.html" title="A base class for widgets with an HTML counterpart." alt="" coords="15,155,137,181"><area shape="rect" href="classWt_1_1WWidget.html" title="The abstract base class for a user-interface component." alt="" coords="28,80,124,107"><area shape="rect" href="classWt_1_1WObject.html" title="A base class for objects that participate in the signal/slot system." alt="" coords="28,5,124,32"></map>
<center><font size="2">[<a href="graph_legend.html">legend</a>]</font></center></div>
<p>
<a href="classWt_1_1WImage-members.html">List of all members.</a><table border="0" cellpadding="0" cellspacing="0">
<tr><td></td></tr>
<tr><td colspan="2"><br><h2>Public Member Functions</h2></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="a3566a1fb818f5a57c4cc0d298cc71c7"></a><!-- doxytag: member="Wt::WImage::WImage" ref="a3566a1fb818f5a57c4cc0d298cc71c7" args="(WContainerWidget *parent=0)" -->
</td><td class="memItemRight" valign="bottom"><a class="el" href="classWt_1_1WImage.html#a3566a1fb818f5a57c4cc0d298cc71c7">WImage</a> (<a class="el" href="classWt_1_1WContainerWidget.html">WContainerWidget</a> *parent=0)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Creates an empty image widget. <br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="42eea962cef07ec071ebae0518d1b48d"></a><!-- doxytag: member="Wt::WImage::WImage" ref="42eea962cef07ec071ebae0518d1b48d" args="(const std::string &imageRef, WContainerWidget *parent=0)" -->
</td><td class="memItemRight" valign="bottom"><a class="el" href="classWt_1_1WImage.html#42eea962cef07ec071ebae0518d1b48d">WImage</a> (const std::string &imageRef, <a class="el" href="classWt_1_1WContainerWidget.html">WContainerWidget</a> *parent=0)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Creates an image widget with given image URL. <br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="3482c9d00484accd1c81fb715c767f6f"></a><!-- doxytag: member="Wt::WImage::WImage" ref="3482c9d00484accd1c81fb715c767f6f" args="(const std::string &imageRef, const WString &altText, WContainerWidget *parent=0)" -->
</td><td class="memItemRight" valign="bottom"><a class="el" href="classWt_1_1WImage.html#3482c9d00484accd1c81fb715c767f6f">WImage</a> (const std::string &imageRef, const <a class="el" href="classWt_1_1WString.html">WString</a> &altText, <a class="el" href="classWt_1_1WContainerWidget.html">WContainerWidget</a> *parent=0)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Creates an image widget with given image URL and alternate text. <br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"> </td><td class="memItemRight" valign="bottom"><a class="el" href="classWt_1_1WImage.html#bf4394e0350e28074875dcbd3ce30ff6">WImage</a> (<a class="el" href="classWt_1_1WResource.html">WResource</a> *resource, const <a class="el" href="classWt_1_1WString.html">WString</a> &altText, <a class="el" href="classWt_1_1WContainerWidget.html">WContainerWidget</a> *parent=0)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Creates an image widget with given image resource and alternate text. <a href="#bf4394e0350e28074875dcbd3ce30ff6"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="classWt_1_1WImage.html#fa619104c48e0152f5847d72a5397fc3">setAlternateText</a> (const <a class="el" href="classWt_1_1WString.html">WString</a> &text)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Sets an alternate text. <a href="#fa619104c48e0152f5847d72a5397fc3"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">const <a class="el" href="classWt_1_1WString.html">WString</a> & </td><td class="memItemRight" valign="bottom"><a class="el" href="classWt_1_1WImage.html#fb3144944ad2203d35d08c29bab7111a">alternateText</a> () const </td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Returns the alternate text. <a href="#fb3144944ad2203d35d08c29bab7111a"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="classWt_1_1WImage.html#cea9ce518f4eec6b19fd4bacc44a52e8">setImageRef</a> (const std::string &url)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Sets the image URL. <a href="#cea9ce518f4eec6b19fd4bacc44a52e8"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">const std::string </td><td class="memItemRight" valign="bottom"><a class="el" href="classWt_1_1WImage.html#e3a7a79cd15e7aa7e4e7c3a72873bc68">imageRef</a> () const </td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Returns the image URL. <a href="#e3a7a79cd15e7aa7e4e7c3a72873bc68"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="classWt_1_1WImage.html#509a0636d08916dc14bc1d6eefa79c58">setResource</a> (<a class="el" href="classWt_1_1WResource.html">WResource</a> *resource)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Sets the image resource. <a href="#509a0636d08916dc14bc1d6eefa79c58"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="el" href="classWt_1_1WResource.html">WResource</a> * </td><td class="memItemRight" valign="bottom"><a class="el" href="classWt_1_1WImage.html#2ae66c010a7c8c0fffc772c8dd36f91c">resource</a> () const </td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Returns the image resource. <a href="#2ae66c010a7c8c0fffc772c8dd36f91c"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="classWt_1_1WImage.html#a5737b44a5161b8494b2691c20315417">addArea</a> (<a class="el" href="classWt_1_1WAbstractArea.html">WAbstractArea</a> *area)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Adds an interactive area. <a href="#a5737b44a5161b8494b2691c20315417"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="classWt_1_1WImage.html#32baad2b361ff4660a8354a98e998535">insertArea</a> (int index, <a class="el" href="classWt_1_1WAbstractArea.html">WAbstractArea</a> *area)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Inserts an interactive area. <a href="#32baad2b361ff4660a8354a98e998535"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="classWt_1_1WImage.html#79b9dedd023e423b1b2575588ed7ff51">removeArea</a> (<a class="el" href="classWt_1_1WAbstractArea.html">WAbstractArea</a> *area)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Removes an interactive area. <a href="#79b9dedd023e423b1b2575588ed7ff51"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="el" href="classWt_1_1WAbstractArea.html">WAbstractArea</a> * </td><td class="memItemRight" valign="bottom"><a class="el" href="classWt_1_1WImage.html#d1900179902128ddd3d26922c33a3b97">area</a> (int index) const </td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Returns the interactive area at the given index. <a href="#d1900179902128ddd3d26922c33a3b97"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">const std::vector<br>
< <a class="el" href="classWt_1_1WAbstractArea.html">WAbstractArea</a> * > </td><td class="memItemRight" valign="bottom"><a class="el" href="classWt_1_1WImage.html#e2dca02b06799eacebc7474569c234b5">areas</a> () const </td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Returns the interactive areas set for this widget. <a href="#e2dca02b06799eacebc7474569c234b5"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="54258a16b4ff221694fd79701ce8cd98"></a><!-- doxytag: member="Wt::WImage::imageLoaded" ref="54258a16b4ff221694fd79701ce8cd98" args="()" -->
<a class="el" href="classWt_1_1EventSignal.html">EventSignal</a> & </td><td class="memItemRight" valign="bottom"><a class="el" href="classWt_1_1WImage.html#54258a16b4ff221694fd79701ce8cd98">imageLoaded</a> ()</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Event emitted when the image was loaded. <br></td></tr>
</table>
<hr><a name="_details"></a><h2>Detailed Description</h2>
A widget that displays an image.
<p>
The image may be specified either as a URL, or may be dynamically generated by a <a class="el" href="classWt_1_1WResource.html" title="An object which can be rendered in the HTTP protocol.">WResource</a>.<p>
You may listen to events by attaching event listeners to signals such as <a class="el" href="classWt_1_1WInteractWidget.html#e11e050cce0d4a8f742afa3ef92bfe8c" title="Event signal emitted when a mouse key was clicked on this widget.">clicked()</a>. Since mouse events pass the coordinates through a <a class="el" href="classWt_1_1WMouseEvent.html" title="A class providing details for a mouse event.">WMouseEvent</a> object, it is possible to react to clicks in specific parts of the image. An alternative is to define interactive areas on the image using <a class="el" href="classWt_1_1WImage.html#a5737b44a5161b8494b2691c20315417" title="Adds an interactive area.">addArea()</a>, which in addition allows to have customized tool tips for certain image areas (using <a class="el" href="classWt_1_1WAbstractArea.html#310e8e1d6360d22bf8bf0e484a52b8f9" title="Sets the tooltip.">WAbstractArea::setToolTip()</a>).<p>
Usage example: <div class="fragment"><pre class="fragment"> <a class="code" href="classWt_1_1WImage.html" title="A widget that displays an image.">Wt::WImage</a> *img = <span class="keyword">new</span> <a class="code" href="classWt_1_1WImage.html" title="A widget that displays an image.">Wt::WImage</a>(<span class="stringliteral">"images/johnny_cash.png"</span>, <span class="keyword">this</span>);
img-><a class="code" href="classWt_1_1WImage.html#fa619104c48e0152f5847d72a5397fc3" title="Sets an alternate text.">setAlternateText</a>(<span class="stringliteral">"Johnny Cash sings a song"</span>);
</pre></div><p>
WImage is an <a class="el" href="classWt_1_1WWidget.html#c78e3af143883334c82031790c87416e">inline </a> widget.<p>
<h3>CSS</h3>
<p>
The widget corresponds to the HTML <code><img></code> tag and does not provide styling. It can be styled using inline or external CSS as appropriate.<p>
<dl class="see" compact><dt><b>See also:</b></dt><dd><a class="el" href="classWt_1_1WResource.html" title="An object which can be rendered in the HTTP protocol.">WResource</a>, <a class="el" href="classWt_1_1WPaintedWidget.html" title="A widget that is painted using vector graphics.">WPaintedWidget</a> </dd></dl>
<hr><h2>Constructor & Destructor Documentation</h2>
<a class="anchor" name="bf4394e0350e28074875dcbd3ce30ff6"></a><!-- doxytag: member="Wt::WImage::WImage" ref="bf4394e0350e28074875dcbd3ce30ff6" args="(WResource *resource, const WString &altText, WContainerWidget *parent=0)" -->
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<td class="memname">Wt::WImage::WImage </td>
<td>(</td>
<td class="paramtype"><a class="el" href="classWt_1_1WResource.html">WResource</a> * </td>
<td class="paramname"> <em>resource</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">const <a class="el" href="classWt_1_1WString.html">WString</a> & </td>
<td class="paramname"> <em>altText</em>, </td>
</tr>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="classWt_1_1WContainerWidget.html">WContainerWidget</a> * </td>
<td class="paramname"> <em>parent</em> = <code>0</code></td><td> </td>
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<td>)</td>
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<div class="memdoc">
<p>
Creates an image widget with given image resource and alternate text.
<p>
Use this constructor if you want to present a dynamically generated image.
</div>
</div><p>
<hr><h2>Member Function Documentation</h2>
<a class="anchor" name="fa619104c48e0152f5847d72a5397fc3"></a><!-- doxytag: member="Wt::WImage::setAlternateText" ref="fa619104c48e0152f5847d72a5397fc3" args="(const WString &text)" -->
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<td class="memname">void Wt::WImage::setAlternateText </td>
<td>(</td>
<td class="paramtype">const <a class="el" href="classWt_1_1WString.html">WString</a> & </td>
<td class="paramname"> <em>text</em> </td>
<td> ) </td>
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<p>
Sets an alternate text.
<p>
The alternate text should provide a fallback for browsers that do not display an image. If no sensible fallback text can be provided, an empty text is preferred over nonsense.<p>
This should not be confused with <a class="el" href="classWt_1_1WWebWidget.html#7b851debbfba51f0b9a011ca42b08c8c" title="Returns the tooltip.">toolTip()</a> text, which provides additional information that is displayed when the mouse hovers over the image.<p>
The default alternate text is an empty text ("").<p>
<dl class="see" compact><dt><b>See also:</b></dt><dd><a class="el" href="classWt_1_1WImage.html#fb3144944ad2203d35d08c29bab7111a" title="Returns the alternate text.">alternateText()</a> </dd></dl>
</div>
</div><p>
<a class="anchor" name="fb3144944ad2203d35d08c29bab7111a"></a><!-- doxytag: member="Wt::WImage::alternateText" ref="fb3144944ad2203d35d08c29bab7111a" args="() const " -->
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<td class="memname">const <a class="el" href="classWt_1_1WString.html">WString</a>& Wt::WImage::alternateText </td>
<td>(</td>
<td class="paramname"> </td>
<td> ) </td>
<td> const<code> [inline]</code></td>
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<p>
Returns the alternate text.
<p>
<dl class="see" compact><dt><b>See also:</b></dt><dd><a class="el" href="classWt_1_1WImage.html#fa619104c48e0152f5847d72a5397fc3" title="Sets an alternate text.">setAlternateText()</a> </dd></dl>
</div>
</div><p>
<a class="anchor" name="cea9ce518f4eec6b19fd4bacc44a52e8"></a><!-- doxytag: member="Wt::WImage::setImageRef" ref="cea9ce518f4eec6b19fd4bacc44a52e8" args="(const std::string &url)" -->
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<td class="memname">void Wt::WImage::setImageRef </td>
<td>(</td>
<td class="paramtype">const std::string & </td>
<td class="paramname"> <em>url</em> </td>
<td> ) </td>
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<p>
Sets the image URL.
<p>
This should not be used when the image is specified as a resource.<p>
<dl class="see" compact><dt><b>See also:</b></dt><dd><a class="el" href="classWt_1_1WImage.html#509a0636d08916dc14bc1d6eefa79c58" title="Sets the image resource.">setResource()</a> </dd></dl>
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<a class="anchor" name="e3a7a79cd15e7aa7e4e7c3a72873bc68"></a><!-- doxytag: member="Wt::WImage::imageRef" ref="e3a7a79cd15e7aa7e4e7c3a72873bc68" args="() const " -->
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<td class="memname">const std::string Wt::WImage::imageRef </td>
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<td> const</td>
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<p>
Returns the image URL.
<p>
When the image is specified as a resource, this returns the current resource URL.
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<a class="anchor" name="509a0636d08916dc14bc1d6eefa79c58"></a><!-- doxytag: member="Wt::WImage::setResource" ref="509a0636d08916dc14bc1d6eefa79c58" args="(WResource *resource)" -->
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<td class="memname">void Wt::WImage::setResource </td>
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Sets the image resource.
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A resource specifies application-dependent content, which may be used to generate an image on demand.<p>
This sets <code>resource</code> as the contents for the image, as an alternative to <a class="el" href="classWt_1_1WImage.html#cea9ce518f4eec6b19fd4bacc44a52e8" title="Sets the image URL.">setImageRef()</a>. The resource may be cleared by passing <code>resource</code> = <code>0</code>.<p>
The image does not assume ownership of the resource.<p>
<dl class="see" compact><dt><b>See also:</b></dt><dd><a class="el" href="classWt_1_1WImage.html#cea9ce518f4eec6b19fd4bacc44a52e8" title="Sets the image URL.">setImageRef()</a> </dd></dl>
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<a class="anchor" name="2ae66c010a7c8c0fffc772c8dd36f91c"></a><!-- doxytag: member="Wt::WImage::resource" ref="2ae66c010a7c8c0fffc772c8dd36f91c" args="() const " -->
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<td class="memname"><a class="el" href="classWt_1_1WResource.html">WResource</a>* Wt::WImage::resource </td>
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Returns the image resource.
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Returns <code>0</code> if no image resource was set.
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<a class="anchor" name="a5737b44a5161b8494b2691c20315417"></a><!-- doxytag: member="Wt::WImage::addArea" ref="a5737b44a5161b8494b2691c20315417" args="(WAbstractArea *area)" -->
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<td class="memname">void Wt::WImage::addArea </td>
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Adds an interactive area.
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Adds the <code>area</code> which listens to events in a specific region of the image. Areas are organized in an indexed list, to which the given <code>area</code> is appended. When areas overlap, the area with the lowest index receives the event.<p>
Ownership of the <code>area</code> is transferred to the image.<p>
<dl class="see" compact><dt><b>See also:</b></dt><dd><a class="el" href="classWt_1_1WImage.html#32baad2b361ff4660a8354a98e998535" title="Inserts an interactive area.">insertArea(int, WAbstractArea *)</a> </dd></dl>
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<a class="anchor" name="32baad2b361ff4660a8354a98e998535"></a><!-- doxytag: member="Wt::WImage::insertArea" ref="32baad2b361ff4660a8354a98e998535" args="(int index, WAbstractArea *area)" -->
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<td class="memname">void Wt::WImage::insertArea </td>
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<td class="paramname"> <em>area</em></td><td> </td>
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<p>
Inserts an interactive area.
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Inserts the <code>area</code> which listens to events in the coresponding area of the image. Areas are organized in a list, and the <em>area</em> is inserted at index <code>index</code>. When areas overlap, the area with the lowest index receives the event.<p>
Ownership of the <code>Area</code> is transferred to the image.<p>
<dl class="see" compact><dt><b>See also:</b></dt><dd><a class="el" href="classWt_1_1WImage.html#a5737b44a5161b8494b2691c20315417" title="Adds an interactive area.">addArea(WAbstractArea *)</a> </dd></dl>
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<a class="anchor" name="79b9dedd023e423b1b2575588ed7ff51"></a><!-- doxytag: member="Wt::WImage::removeArea" ref="79b9dedd023e423b1b2575588ed7ff51" args="(WAbstractArea *area)" -->
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<td class="memname">void Wt::WImage::removeArea </td>
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<td class="paramname"> <em>area</em> </td>
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Removes an interactive area.
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Removes the <code>area</code> from this widget, and also returns the ownership.<p>
<dl class="see" compact><dt><b>See also:</b></dt><dd><a class="el" href="classWt_1_1WImage.html#a5737b44a5161b8494b2691c20315417" title="Adds an interactive area.">addArea(WAbstractArea *)</a> </dd></dl>
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<a class="anchor" name="d1900179902128ddd3d26922c33a3b97"></a><!-- doxytag: member="Wt::WImage::area" ref="d1900179902128ddd3d26922c33a3b97" args="(int index) const " -->
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<td class="memname"><a class="el" href="classWt_1_1WAbstractArea.html">WAbstractArea</a> * Wt::WImage::area </td>
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Returns the interactive area at the given index.
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Returns <code>0</code> if <code>index</code> was invalid.<p>
<dl class="see" compact><dt><b>See also:</b></dt><dd><a class="el" href="classWt_1_1WImage.html#32baad2b361ff4660a8354a98e998535" title="Inserts an interactive area.">insertArea(int, WAbstractArea *)</a> </dd></dl>
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<a class="anchor" name="e2dca02b06799eacebc7474569c234b5"></a><!-- doxytag: member="Wt::WImage::areas" ref="e2dca02b06799eacebc7474569c234b5" args="() const " -->
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<td class="memname">const std::vector< <a class="el" href="classWt_1_1WAbstractArea.html">WAbstractArea</a> * > Wt::WImage::areas </td>
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Returns the interactive areas set for this widget.
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<dl class="see" compact><dt><b>See also:</b></dt><dd><a class="el" href="classWt_1_1WImage.html#a5737b44a5161b8494b2691c20315417" title="Adds an interactive area.">addArea()</a> </dd></dl>
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