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<div class="title">EWOL: Add Widget in XML access </div> </div>
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<div class="contents">
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<div class="toc"><h3>Table of Contents</h3>
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<ul><li class="level1"><a href="#ewol_tutorial_add_widget_custum_in_xml_objectif">Objectifs: </a></li>
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<li class="level1"><a href="#ewol_tutorial_add_widget_custum_in_xml_declare">Declare object in XML </a></li>
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<li class="level1"><a href="#ewol_tutorial_add_widget_custum_in_xml_dec2">Declare on XML and configuration </a></li>
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<li class="level1"><a href="#ewol_tutorial_add_widget_custum_in_xml_parse">Special case SubParsing XML element </a></li>
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<div class="textblock"><h1><a class="anchor" id="ewol_tutorial_add_widget_custum_in_xml_objectif"></a>
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Objectifs: </h1>
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<ul>
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<li>Create a C++ widget</li>
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<li>use it in a XML</li>
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</ul>
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<h1><a class="anchor" id="ewol_tutorial_add_widget_custum_in_xml_declare"></a>
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Declare object in XML </h1>
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<p>Object can be declared in some XML, (like gui decription), then we need to declare the Object in the system recognition.</p>
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<h2>Declare Object </h2>
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<p>In your application "void onCreate(ewol::Context& _context) override" add the function:</p>
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<div class="fragment"><div class="line">YourWidgetClass::createManagerWidget(_context.getWidgetManager());</div></div><!-- fragment --><p>The simple question is: I does not define this function, where it is done ?</p>
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<p>The createManagerWidget is instancuate when you use the macro:</p>
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<div class="fragment"><div class="line">DECLARE_WIDGET_FACTORY(YourWidgetClass, <span class="stringliteral">"YourWidgetClass"</span>);</div></div><!-- fragment --><p>it create 2 function: "create(...)" and "createManagerWidget()"</p>
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<h1><a class="anchor" id="ewol_tutorial_add_widget_custum_in_xml_dec2"></a>
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Declare on XML and configuration </h1>
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<p>in the xml instance simply request it like:</p>
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<div class="fragment"><div class="line"><<span class="keywordtype">YourWidgetClass</span> <span class="keyword">name</span>=<span class="stringliteral">"jkjkj"</span>></div><div class="line"> ...</div><div class="line"></<span class="keywordtype">YourWidgetClass</span>></div></div><!-- fragment --><p>The xml attribute are automaticaly parsed to configure properties of you object (this is the reason of naming it).</p>
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<h1><a class="anchor" id="ewol_tutorial_add_widget_custum_in_xml_parse"></a>
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Special case SubParsing XML element </h1>
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<p>If you want to parse sub-node of the xml just override the function member:</p>
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<div class="fragment"><div class="line"><span class="keywordtype">bool</span> loadXML(<span class="keyword">const</span> <a class="codeRef" doxygen="/home/heero/dev/perso/out/doc/release/exml.tag:http://atria-soft.github.io/exml/" href="http://atria-soft.github.io/exml/classexml_1_1_element.html">exml::Element</a>& _node) <span class="keyword">override</span>;</div></div><!-- fragment --><p>Many example are availlable in container widget.</p>
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<p>Simple example:</p>
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<div class="fragment"><div class="line"><span class="keywordflow">if</span> (_node.exist() == <span class="keyword">false</span>) {</div><div class="line"> <span class="keywordflow">return</span> <span class="keyword">false</span>;</div><div class="line">}</div><div class="line"><span class="comment">// parse generic properties:</span></div><div class="line"><a class="code" href="classewol_1_1_widget.html#ae07ac7316857f71f873d586d3a84f08b">ewol::Widget::loadXML</a>(_node);</div><div class="line"><span class="comment">// parse all the elements:</span></div><div class="line"><span class="keywordflow">for</span> (<span class="keyword">const</span> <span class="keyword">auto</span> it : _node.nodes) {</div><div class="line"> <a class="codeRef" doxygen="/home/heero/dev/perso/out/doc/release/exml.tag:http://atria-soft.github.io/exml/" href="http://atria-soft.github.io/exml/classexml_1_1_element.html">exml::Element</a> pNode = it.<a class="codeRef" doxygen="/home/heero/dev/perso/out/doc/release/exml.tag:http://atria-soft.github.io/exml/" href="http://atria-soft.github.io/exml/classexml_1_1_node.html#a767481c377a99616b66b953a02f64dbe">toElement</a>();</div><div class="line"> <span class="keywordflow">if</span> (pNode.<a class="codeRef" doxygen="/home/heero/dev/perso/out/doc/release/exml.tag:http://atria-soft.github.io/exml/" href="http://atria-soft.github.io/exml/classexml_1_1_node.html#ae2be1ded472149113f3ea70710f57b39">exist</a>() == <span class="keyword">false</span>) {</div><div class="line"> <span class="comment">// trash here all that is not element</span></div><div class="line"> <span class="keywordflow">continue</span>;</div><div class="line"> }</div><div class="line"> <span class="comment">// Get the sub-node name:</span></div><div class="line"> std::string widgetName = pNode.<a class="codeRef" doxygen="/home/heero/dev/perso/out/doc/release/exml.tag:http://atria-soft.github.io/exml/" href="http://atria-soft.github.io/exml/classexml_1_1_node.html#a8b9a9d4befc43fce6cf11076b4d11aca">getValue</a>();</div><div class="line"> <span class="keywordflow">if</span> (getWidgetManager().exist(widgetName) == <span class="keyword">false</span>) {</div><div class="line"> APPL_ERROR(<span class="stringliteral">"["</span> << getId() << <span class="stringliteral">"] (l "</span><<pNode-><a class="codeRef" doxygen="/home/heero/dev/perso/out/doc/release/exml.tag:http://atria-soft.github.io/exml/" href="http://atria-soft.github.io/exml/classexml_1_1_node.html#a54d14b2b0d56d68d451b97b60e05c0cb">getPos</a>()<<<span class="stringliteral">") Unknown basic node='"</span> << widgetName << <span class="stringliteral">"' not in : ["</span> << getWidgetManager().list() << <span class="stringliteral">"]"</span> );</div><div class="line"> <span class="keywordflow">continue</span>;</div><div class="line"> }</div><div class="line"> ...</div><div class="line">}</div><div class="line"><span class="keywordflow">return</span> <span class="keyword">true</span>;</div></div><!-- fragment --> </div></div><!-- contents -->
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