scrawl-canvas
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Version 8.9.4 - 19 Nov 2022
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<h1 id="unstackedelement-factory">UnstackedElement factory</h1>
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<p><em><strong>To be aware - this artefact factory is HIGHLY EXPERIMENTAL; its API will be subject to short-notice breaking changes as we amend and inprove the artefact’s functionality</strong></em></p>
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<p>TODO - documentation</p>
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<h4 id="to-instantiate-objects-from-the-factory">To instantiate objects from the factory</h4>
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<h4 id="library-storage">Library storage</h4>
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<h4 id="clone-functionality">Clone functionality</h4>
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<h4 id="kill-functionality">Kill functionality</h4>
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<h2 id="imports">Imports</h2>
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<div class="content"><div class='highlight'><pre><span class="hljs-keyword">import</span> { unstackedelement, constructors } <span class="hljs-keyword">from</span> <span class="hljs-string">'../core/library.js'</span>;
<span class="hljs-keyword">import</span> { xt, mergeOver, Ωempty } <span class="hljs-keyword">from</span> <span class="hljs-string">'../core/utilities.js'</span>;
<span class="hljs-keyword">import</span> { makeCanvas } <span class="hljs-keyword">from</span> <span class="hljs-string">'./canvas.js'</span>;
<span class="hljs-keyword">import</span> baseMix <span class="hljs-keyword">from</span> <span class="hljs-string">'../mixin/base.js'</span>;</pre></div></div>
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<h2 id="unstackedelement-constructor">UnstackedElement constructor</h2>
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<div class="content"><div class='highlight'><pre><span class="hljs-keyword">const</span> <span class="hljs-title class_">UnstackedElement</span> = <span class="hljs-keyword">function</span> (<span class="hljs-params">el</span>) {
<span class="hljs-keyword">let</span> name = el.<span class="hljs-property">id</span> || el.<span class="hljs-property">name</span>;
<span class="hljs-variable language_">this</span>.<span class="hljs-title function_">makeName</span>(name);
<span class="hljs-variable language_">this</span>.<span class="hljs-title function_">register</span>();
el.<span class="hljs-title function_">setAttribute</span>(<span class="hljs-string">'data-scrawl-name'</span>, <span class="hljs-variable language_">this</span>.<span class="hljs-property">name</span>);
<span class="hljs-variable language_">this</span>.<span class="hljs-property">domElement</span> = el;
<span class="hljs-variable language_">this</span>.<span class="hljs-property">elementComputedStyles</span> = <span class="hljs-variable language_">window</span>.<span class="hljs-title function_">getComputedStyle</span>(el);
<span class="hljs-variable language_">this</span>.<span class="hljs-property">hostStyles</span> = Ωempty;
<span class="hljs-variable language_">this</span>.<span class="hljs-property">canvasStartX</span> = <span class="hljs-number">0</span>;
<span class="hljs-variable language_">this</span>.<span class="hljs-property">canvasStartY</span> = <span class="hljs-number">0</span>;
<span class="hljs-variable language_">this</span>.<span class="hljs-property">canvasWidth</span> = <span class="hljs-number">0</span>;
<span class="hljs-variable language_">this</span>.<span class="hljs-property">canvasHeight</span> = <span class="hljs-number">0</span>;
<span class="hljs-variable language_">this</span>.<span class="hljs-property">canvasZIndex</span> = <span class="hljs-number">0</span>;
<span class="hljs-keyword">return</span> <span class="hljs-variable language_">this</span>;
};</pre></div></div>
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<h2 id="unstackedelement-object-prototype-setup">UnstackedElement object prototype setup</h2>
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<div class="content"><div class='highlight'><pre><span class="hljs-keyword">let</span> P = <span class="hljs-title class_">UnstackedElement</span>.<span class="hljs-property"><span class="hljs-keyword">prototype</span></span> = <span class="hljs-title class_">Object</span>.<span class="hljs-title function_">create</span>(<span class="hljs-title class_">Object</span>.<span class="hljs-property"><span class="hljs-keyword">prototype</span></span>);
P.<span class="hljs-property">type</span> = <span class="hljs-string">'UnstackedElement'</span>;
P.<span class="hljs-property">lib</span> = <span class="hljs-string">'unstackedelement'</span>;
P.<span class="hljs-property">isArtefact</span> = <span class="hljs-literal">false</span>;
P.<span class="hljs-property">isAsset</span> = <span class="hljs-literal">false</span>;</pre></div></div>
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<p>Apply mixins to prototype object</p>
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<div class="content"><div class='highlight'><pre>P = <span class="hljs-title function_">baseMix</span>(P);</pre></div></div>
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<h2 id="define-default-attributes">Define default attributes</h2>
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<div class="content"><div class='highlight'><pre><span class="hljs-keyword">let</span> defaultAttributes = {</pre></div></div>
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<p>TODO - documentation</p>
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<div class="content"><div class='highlight'><pre> <span class="hljs-attr">canvasOnTop</span>: <span class="hljs-literal">false</span>,
};
P.<span class="hljs-property">defs</span> = <span class="hljs-title function_">mergeOver</span>(P.<span class="hljs-property">defs</span>, defaultAttributes);</pre></div></div>
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<h2 id="packet-management">Packet management</h2>
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<p>TODO</p>
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<h2 id="define-getter-setter-and-deltasetter-functions">Define getter, setter and deltaSetter functions</h2>
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<div class="content"><div class='highlight'><pre><span class="hljs-keyword">let</span> G = P.<span class="hljs-property">getters</span>,
S = P.<span class="hljs-property">setters</span>,
D = P.<span class="hljs-property">deltaSetters</span>;</pre></div></div>
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<h2 id="define-prototype-functions">Define prototype functions</h2>
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<p>TODO - documentation</p>
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<p>This is going to be rewritten as part of the “kill” review/recode work</p>
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<div class="content"><div class='highlight'><pre>P.<span class="hljs-property">demolish</span> = <span class="hljs-keyword">function</span> (<span class="hljs-params">removeFromDom = <span class="hljs-literal">false</span></span>) {
<span class="hljs-keyword">return</span> <span class="hljs-literal">true</span>;
};</pre></div></div>
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<p>Adds a canvas element to sit behind the element, or in front of it, depending on the setting of the <strong>canvasOnTop</strong> attribute</p>
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<div class="content"><div class='highlight'><pre>P.<span class="hljs-property">addCanvas</span> = <span class="hljs-keyword">function</span> (<span class="hljs-params">items = Ωempty</span>) {
<span class="hljs-keyword">if</span> (!<span class="hljs-variable language_">this</span>.<span class="hljs-property">canvas</span>) {
<span class="hljs-keyword">let</span> canvas = <span class="hljs-variable language_">document</span>.<span class="hljs-title function_">createElement</span>(<span class="hljs-string">'canvas'</span>),
el = <span class="hljs-variable language_">this</span>.<span class="hljs-property">domElement</span>,
style = el.<span class="hljs-property">style</span>;
<span class="hljs-keyword">if</span> (style.<span class="hljs-property">position</span> === <span class="hljs-string">'static'</span>) style.<span class="hljs-property">position</span> = <span class="hljs-string">'relative'</span>;
canvas.<span class="hljs-property">id</span> = <span class="hljs-string">`<span class="hljs-subst">${<span class="hljs-variable language_">this</span>.name}</span>-canvas`</span>;
el.<span class="hljs-title function_">prepend</span>(canvas);
<span class="hljs-keyword">let</span> art = <span class="hljs-title function_">makeCanvas</span>({
<span class="hljs-attr">name</span>: <span class="hljs-string">`<span class="hljs-subst">${<span class="hljs-variable language_">this</span>.name}</span>-canvas`</span>,
<span class="hljs-attr">domElement</span>: canvas,
<span class="hljs-attr">position</span>: <span class="hljs-string">'absolute'</span>,
});
<span class="hljs-variable language_">this</span>.<span class="hljs-property">canvas</span> = art;
art.<span class="hljs-title function_">set</span>(items);
<span class="hljs-variable language_">this</span>.<span class="hljs-title function_">updateCanvas</span>();
<span class="hljs-keyword">return</span> art;
}
};</pre></div></div>
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<p>DOM element styles that we need to observe for changes, to keep the canvas in step with its element</p>
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<div class="content"><div class='highlight'><pre>P.<span class="hljs-property">includedStyles</span> = [<span class="hljs-string">'width'</span>, <span class="hljs-string">'height'</span>, <span class="hljs-string">'zIndex'</span>, <span class="hljs-string">'borderBottomLeftRadius'</span>, <span class="hljs-string">'borderBottomRightRadius'</span>, <span class="hljs-string">'borderTopLeftRadius'</span>, <span class="hljs-string">'borderTopRightRadius'</span>];</pre></div></div>
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<p>Included styles that we can transfer directly from DOM element to canvas with no further processing</p>
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<div class="content"><div class='highlight'><pre>P.<span class="hljs-property">mimickedStyles</span> = [<span class="hljs-string">'borderBottomLeftRadius'</span>, <span class="hljs-string">'borderBottomRightRadius'</span>, <span class="hljs-string">'borderTopLeftRadius'</span>, <span class="hljs-string">'borderTopRightRadius'</span>];</pre></div></div>
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<p>Observer function - runs on every RAF loop (when the DOM element is viewable); aim is to:</p>
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<ul>
<li>keep canvas dimensions exactly matched with its DOM element’s dimensions (including border/padding)</li>
<li>position the canvas correctly over/under the DOM element (taking into account border/padding)</li>
<li>maintain parity between other DOM element CSS values and those values on the canvas (eg border radius)</li>
</ul>
</div>
<div class="content"><div class='highlight'><pre>P.<span class="hljs-property">checkElementStyleValues</span> = <span class="hljs-keyword">function</span> (<span class="hljs-params"></span>) {
<span class="hljs-keyword">let</span> results = {};
<span class="hljs-keyword">let</span> el = <span class="hljs-variable language_">this</span>.<span class="hljs-property">domElement</span>,
wrapper = <span class="hljs-variable language_">this</span>.<span class="hljs-property">canvas</span>;
<span class="hljs-keyword">if</span> (el && wrapper && wrapper.<span class="hljs-property">domElement</span>) {
<span class="hljs-keyword">let</span> host = <span class="hljs-variable language_">this</span>.<span class="hljs-property">hostStyles</span>,
style = <span class="hljs-variable language_">this</span>.<span class="hljs-property">elementComputedStyles</span>,
canvas = wrapper.<span class="hljs-property">domElement</span>,
includedStyles = <span class="hljs-variable language_">this</span>.<span class="hljs-property">includedStyles</span>;
<span class="hljs-keyword">let</span> {<span class="hljs-attr">x</span>: elX, <span class="hljs-attr">y</span>: elY, <span class="hljs-attr">width</span>: elW, <span class="hljs-attr">height</span>: elH} = el.<span class="hljs-title function_">getBoundingClientRect</span>();
<span class="hljs-keyword">let</span> {<span class="hljs-attr">x</span>: canvasX, <span class="hljs-attr">y</span>: canvasY} = canvas.<span class="hljs-title function_">getBoundingClientRect</span>();
<span class="hljs-keyword">let</span> {<span class="hljs-attr">zIndex</span>: styleZ, <span class="hljs-attr">width</span>: styleW, <span class="hljs-attr">height</span>: styleH} = style;
elX = <span class="hljs-title class_">Math</span>.<span class="hljs-title function_">floor</span>(elX);
elY = <span class="hljs-title class_">Math</span>.<span class="hljs-title function_">floor</span>(elY);
canvasX = <span class="hljs-title class_">Math</span>.<span class="hljs-title function_">floor</span>(canvasX);
canvasY = <span class="hljs-title class_">Math</span>.<span class="hljs-title function_">floor</span>(canvasY);
elW = <span class="hljs-title class_">Math</span>.<span class="hljs-title function_">floor</span>(elW);
elH = <span class="hljs-title class_">Math</span>.<span class="hljs-title function_">floor</span>(elH);
styleW = <span class="hljs-title class_">Math</span>.<span class="hljs-title function_">floor</span>(<span class="hljs-built_in">parseFloat</span>(styleW));
styleH = <span class="hljs-title class_">Math</span>.<span class="hljs-title function_">floor</span>(<span class="hljs-built_in">parseFloat</span>(styleH));
includedStyles.<span class="hljs-title function_">forEach</span>(<span class="hljs-function"><span class="hljs-params">item</span> =></span> {
<span class="hljs-keyword">switch</span> (item) {
<span class="hljs-keyword">case</span> <span class="hljs-string">'width'</span> :
<span class="hljs-keyword">let</span> w = <span class="hljs-title class_">Math</span>.<span class="hljs-title function_">max</span>(styleW, elW);
<span class="hljs-keyword">if</span> (<span class="hljs-variable language_">this</span>.<span class="hljs-property">canvasWidth</span> !== w) {
<span class="hljs-variable language_">this</span>.<span class="hljs-property">canvasWidth</span> = w;
<span class="hljs-variable language_">this</span>.<span class="hljs-property">dirtyDimensions</span> = <span class="hljs-literal">true</span>;
}
<span class="hljs-keyword">break</span>;
<span class="hljs-keyword">case</span> <span class="hljs-string">'height'</span> :
<span class="hljs-keyword">let</span> h = <span class="hljs-title class_">Math</span>.<span class="hljs-title function_">max</span>(styleH, elH);
<span class="hljs-keyword">if</span> (<span class="hljs-variable language_">this</span>.<span class="hljs-property">canvasHeight</span> !== h) {
<span class="hljs-variable language_">this</span>.<span class="hljs-property">canvasHeight</span> = h;
<span class="hljs-variable language_">this</span>.<span class="hljs-property">dirtyDimensions</span> = <span class="hljs-literal">true</span>;
}
<span class="hljs-keyword">break</span>;
<span class="hljs-keyword">case</span> <span class="hljs-string">'zIndex'</span> :
<span class="hljs-keyword">let</span> z = (styleZ === <span class="hljs-string">'auto'</span>) ? <span class="hljs-number">0</span> : <span class="hljs-built_in">parseInt</span>(styleZ, <span class="hljs-number">10</span>);
z = (<span class="hljs-variable language_">this</span>.<span class="hljs-property">canvasOnTop</span>) ? z + <span class="hljs-number">1</span> : z - <span class="hljs-number">1</span>;
<span class="hljs-keyword">if</span> (<span class="hljs-variable language_">this</span>.<span class="hljs-property">canvasZIndex</span> !== z) {
<span class="hljs-variable language_">this</span>.<span class="hljs-property">canvasZIndex</span> = z;
<span class="hljs-variable language_">this</span>.<span class="hljs-property">dirtyZIndex</span> = <span class="hljs-literal">true</span>;
}
<span class="hljs-keyword">break</span>;
<span class="hljs-keyword">default</span> :
<span class="hljs-keyword">let</span> hi = host[item],
si = style[item];
<span class="hljs-keyword">if</span>(!<span class="hljs-title function_">xt</span>(hi) || hi !== si) {
host[item] = si;
results[item] = si;
}
}
});
<span class="hljs-keyword">let</span> dx = elX - canvasX,
dy = elY - canvasY;
<span class="hljs-keyword">if</span> (dx || dy) {
<span class="hljs-variable language_">this</span>.<span class="hljs-property">canvasStartX</span> += dx;
<span class="hljs-variable language_">this</span>.<span class="hljs-property">canvasStartY</span> += dy;
<span class="hljs-variable language_">this</span>.<span class="hljs-property">dirtyStart</span> = <span class="hljs-literal">true</span>;
}
}
<span class="hljs-keyword">return</span> results;
};</pre></div></div>
</li>
<li id="section-26">
<div class="annotation">
<div class="sswrap ">
<a class="ss" href="#section-26">§</a>
</div>
<p>Perform any updates reported by the observer function</p>
</div>
</li>
<li id="section-27">
<div class="annotation">
<div class="sswrap ">
<a class="ss" href="#section-27">§</a>
</div>
<p>UnstackedElement canvases keep their display and base canvases in dimensional sync - which means that <strong>relatively positioned and dimensioned</strong> entitys in the canvas (those set with appropriate ‘val%’ string values) will update in line with changes in the DOM element’s width, height, padding and margin values</p>
</div>
<div class="content"><div class='highlight'><pre>P.<span class="hljs-property">updateCanvas</span> = <span class="hljs-keyword">function</span> (<span class="hljs-params"></span>) {
<span class="hljs-keyword">if</span> (<span class="hljs-variable language_">this</span>.<span class="hljs-property">canvas</span> && <span class="hljs-variable language_">this</span>.<span class="hljs-property">canvas</span>.<span class="hljs-property">domElement</span>) {
<span class="hljs-keyword">let</span> canvas = <span class="hljs-variable language_">this</span>.<span class="hljs-property">canvas</span>,
style = canvas.<span class="hljs-property">domElement</span>.<span class="hljs-property">style</span>,
mimics = <span class="hljs-variable language_">this</span>.<span class="hljs-property">mimickedStyles</span>,
updates = <span class="hljs-variable language_">this</span>.<span class="hljs-title function_">checkElementStyleValues</span>();
<span class="hljs-keyword">for</span> (<span class="hljs-keyword">let</span> [key, value] <span class="hljs-keyword">of</span> <span class="hljs-title class_">Object</span>.<span class="hljs-title function_">entries</span>(updates)) {
<span class="hljs-keyword">if</span> (mimics.<span class="hljs-title function_">indexOf</span>(key) >= <span class="hljs-number">0</span>) {
style[key] = value;
}
}
<span class="hljs-keyword">if</span> (<span class="hljs-variable language_">this</span>.<span class="hljs-property">dirtyStart</span>) {
<span class="hljs-variable language_">this</span>.<span class="hljs-property">dirtyStart</span> = <span class="hljs-literal">false</span>;
canvas.<span class="hljs-title function_">set</span>({
<span class="hljs-attr">startX</span>: <span class="hljs-variable language_">this</span>.<span class="hljs-property">canvasStartX</span>,
<span class="hljs-attr">startY</span>: <span class="hljs-variable language_">this</span>.<span class="hljs-property">canvasStartY</span>,
});
}
<span class="hljs-keyword">if</span> (<span class="hljs-variable language_">this</span>.<span class="hljs-property">dirtyDimensions</span>) {
<span class="hljs-variable language_">this</span>.<span class="hljs-property">dirtyDimensions</span> = <span class="hljs-literal">false</span>;
<span class="hljs-keyword">let</span> w = <span class="hljs-variable language_">this</span>.<span class="hljs-property">canvasWidth</span>,
h = <span class="hljs-variable language_">this</span>.<span class="hljs-property">canvasHeight</span>;
canvas.<span class="hljs-title function_">set</span>({
<span class="hljs-attr">width</span>: w,
<span class="hljs-attr">height</span>: h,
});
canvas.<span class="hljs-property">dirtyDimensions</span> = <span class="hljs-literal">true</span>;
canvas.<span class="hljs-property">base</span>.<span class="hljs-title function_">set</span>({
<span class="hljs-attr">width</span>: w,
<span class="hljs-attr">height</span>: h,
});
canvas.<span class="hljs-property">base</span>.<span class="hljs-property">dirtyDimensions</span> = <span class="hljs-literal">true</span>;
canvas.<span class="hljs-title function_">cleanDimensions</span>();
canvas.<span class="hljs-property">base</span>.<span class="hljs-title function_">cleanDimensions</span>();
}
<span class="hljs-keyword">if</span> (<span class="hljs-variable language_">this</span>.<span class="hljs-property">dirtyZIndex</span>) {
<span class="hljs-variable language_">this</span>.<span class="hljs-property">dirtyZIndex</span> = <span class="hljs-literal">false</span>;
style.<span class="hljs-property">zIndex</span> = <span class="hljs-variable language_">this</span>.<span class="hljs-property">canvasZIndex</span>;
}
}
};</pre></div></div>
</li>
<li id="section-28">
<div class="annotation">
<div class="sswrap ">
<a class="ss" href="#section-28">§</a>
</div>
<h2 id="exported-factory-function">Exported factory function</h2>
</div>
<div class="content"><div class='highlight'><pre><span class="hljs-keyword">const</span> makeUnstackedElement = <span class="hljs-keyword">function</span> (<span class="hljs-params">items</span>) {
<span class="hljs-keyword">if</span> (!items) <span class="hljs-keyword">return</span> <span class="hljs-literal">false</span>;
<span class="hljs-keyword">return</span> <span class="hljs-keyword">new</span> <span class="hljs-title class_">UnstackedElement</span>(items);
};
constructors.<span class="hljs-property">UnstackedElement</span> = <span class="hljs-title class_">UnstackedElement</span>;
<span class="hljs-keyword">export</span> {
makeUnstackedElement,
};</pre></div></div>
</li>
</ul>
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