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<title>Qt 4.8: itemCreation.js Example File (declarative/toys/dynamicscene/qml/dynamicscene/itemCreation.js)</title>
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<h1 class="title">itemCreation.js Example File</h1>
<span class="small-subtitle">declarative/toys/dynamicscene/qml/dynamicscene/itemCreation.js</span>
<!-- $$$declarative/toys/dynamicscene/qml/dynamicscene/itemCreation.js-description -->
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<pre class="js"> var <span class="name">itemComponent</span> = <span class="number">null</span>;
var <span class="name">draggedItem</span> = <span class="number">null</span>;
var <span class="name">startingMouse</span>;
var <span class="name">posnInWindow</span>;
<span class="keyword">function</span> <span class="name">startDrag</span>(<span class="name">mouse</span>)
{
<span class="name">posnInWindow</span> <span class="operator">=</span> <span class="name">paletteItem</span>.<span class="name">mapToItem</span>(<span class="name">window</span>, <span class="number">0</span>, <span class="number">0</span>);
<span class="name">startingMouse</span> <span class="operator">=</span> { x: <span class="name">mouse</span>.<span class="name">x</span>, y: mouse.y }
<span class="name">loadComponent</span>();
}
<span class="comment">//Creation is split into two functions due to an asynchronous wait while</span>
<span class="comment">//possible external files are loaded.</span>
<span class="keyword">function</span> <span class="name">loadComponent</span>() {
<span class="keyword">if</span> (<span class="name">itemComponent</span> <span class="operator">!=</span> <span class="number">null</span>) { <span class="comment">// component has been previously loaded</span>
<span class="name">createItem</span>();
<span class="keyword">return</span>;
}
<span class="name">itemComponent</span> <span class="operator">=</span> <span class="name">Qt</span>.<span class="name">createComponent</span>(<span class="name">paletteItem</span>.<span class="name">componentFile</span>);
<span class="keyword">if</span> (<span class="name">itemComponent</span>.<span class="name">status</span> <span class="operator">==</span> <span class="name">Component</span>.<span class="name">Loading</span>) <span class="comment">//Depending on the content, it can be ready or error immediately</span>
<span class="name">component</span>.<span class="name">statusChanged</span>.<span class="name">connect</span>(<span class="name">createItem</span>);
else
<span class="name">createItem</span>();
}
<span class="keyword">function</span> <span class="name">createItem</span>() {
<span class="keyword">if</span> (<span class="name">itemComponent</span>.<span class="name">status</span> <span class="operator">==</span> <span class="name">Component</span>.<span class="name">Ready</span> <span class="operator">&&</span> <span class="name">draggedItem</span> <span class="operator">==</span> <span class="number">null</span>) {
<span class="name">draggedItem</span> <span class="operator">=</span> <span class="name">itemComponent</span>.<span class="name">createObject</span>(<span class="name">window</span>, {"image": <span class="name">paletteItem</span>.<span class="name">image</span>, "x": posnInWindow.x, "y": posnInWindow.y, "z": 3});
<span class="comment">// make sure created item is above the ground layer</span>
} else <span class="keyword">if</span> (<span class="name">itemComponent</span>.<span class="name">status</span> <span class="operator">==</span> <span class="name">Component</span>.<span class="name">Error</span>) {
<span class="name">draggedItem</span> <span class="operator">=</span> <span class="number">null</span>;
<span class="name">console</span>.<span class="name">log</span>(<span class="string">"error creating component"</span>);
<span class="name">console</span>.<span class="name">log</span>(<span class="name">itemComponent</span>.<span class="name">errorString</span>());
}
}
<span class="keyword">function</span> <span class="name">continueDrag</span>(<span class="name">mouse</span>)
{
<span class="keyword">if</span> (<span class="name">draggedItem</span> <span class="operator">==</span> <span class="number">null</span>)
<span class="keyword">return</span>;
<span class="name">draggedItem</span>.<span class="name">x</span> <span class="operator">=</span> <span class="name">mouse</span>.<span class="name">x</span> <span class="operator">+</span> <span class="name">posnInWindow</span>.<span class="name">x</span> <span class="operator">-</span> <span class="name">startingMouse</span>.<span class="name">x</span>;
<span class="name">draggedItem</span>.<span class="name">y</span> <span class="operator">=</span> <span class="name">mouse</span>.<span class="name">y</span> <span class="operator">+</span> <span class="name">posnInWindow</span>.<span class="name">y</span> <span class="operator">-</span> <span class="name">startingMouse</span>.<span class="name">y</span>;
}
<span class="keyword">function</span> <span class="name">endDrag</span>(<span class="name">mouse</span>)
{
<span class="keyword">if</span> (<span class="name">draggedItem</span> <span class="operator">==</span> <span class="number">null</span>)
<span class="keyword">return</span>;
<span class="keyword">if</span> (<span class="name">draggedItem</span>.<span class="name">x</span> <span class="operator">+</span> <span class="name">draggedItem</span>.<span class="name">width</span> <span class="operator">></span> <span class="name">toolbox</span>.<span class="name">x</span>) { <span class="comment">//Don't drop it in the toolbox</span>
<span class="name">draggedItem</span>.<span class="name">destroy</span>();
<span class="name">draggedItem</span> <span class="operator">=</span> <span class="number">null</span>;
} else {
<span class="name">draggedItem</span>.<span class="name">created</span> <span class="operator">=</span> <span class="number">true</span>;
<span class="name">draggedItem</span> <span class="operator">=</span> <span class="number">null</span>;
}
}</pre>
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<!-- @@@declarative/toys/dynamicscene/qml/dynamicscene/itemCreation.js -->
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