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POWhat is best practice for handling resize events in a polymer element?
 

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  1. POWhat is best practice for handling resize events in a polymer element?
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    <p>I'm trying to create a "Viewport" type element extended from a Canvas element. I intended for it to fill the parent container, but that seems not very trivial. </p> <p>The canvas element does not work with style="width:100%; height:100%" (it will revert to a default value of 300x150 pixels if the special Canvas width and the height attributes are not set, or it will go to 100x100 pixels if I try to set those attributes to "100%". This leaves me with the task of manually setting the width of the canvas element according to the size of the parent element. However I am at a loss when trying to figure out a way to access a resize event I could add a handler to from the perspective of the custom element. I don't seem to get access to window.on.resize from anywhere within the custom element. Do I have to do this from the outside?</p> <p>Here is an example polymer element definition:</p> <pre class="lang-html prettyprint-override"><code>&lt;polymer-element name="canvas-viewport"&gt; &lt;template&gt; &lt;style&gt; @host{ :scope { margin:0px; padding:0px; display:block; position:relative; width:100%; height:100%; background:limegreen; overflow:visible; border:0; } } div { border:0; margin:0px; padding:0px; width:100%; height:100%; } &lt;/style&gt; &lt;div id="container"&gt; &lt;canvas width="{{wpWidth}}" height="{{wpHeight}}" id="theCanvas"&gt;&lt;/canvas&gt; &lt;/div&gt; &lt;/template&gt; &lt;script type="application/dart" src="canvas_viewport.dart"&gt;&lt;/script&gt; &lt;/polymer-element&gt; </code></pre> <p>Here is some dart code in the accompanying polymer class definition for trying to handle the resize that I made based on a suggested solution to this question.</p> <pre class="lang-dart prettyprint-override"><code>@override void attached() { super.attached(); viewPortContainer = shadowRoot.querySelector("#container"); window.onResize.listen(resizecontainer); } void resizecontainer(Event e){ wpWidth = viewPortContainer.clientWidth; wpHeight = viewPortContainer.clientHeight; print("resizing Width:$wpWidth , Height:$wpHeight "); } </code></pre> <p>However this results in a bug where the height grows by three pixels on each resize event, even though margins and paddings are set to zero.</p>
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