Widget example: CSS patterns
This example widget lets users choose a pattern from a selection and define colors and spacing.
Widget UI
The widget UI exposes the following properties and groups them in a single card.
| Name | Id | Type | Description |
|---|---|---|---|
Select Pattern | patternId | selection | Selection of pattern names |
Back Color | backColorId | color | Background color |
Front Color | frontColorId | color | Foreground color |
Spacing | spacingId | number | Spacing between pattern repetitions |
UI definition
{
"model": {
"fields": [
{
"id": "patternId",
"type": "selection",
"title": "Select Pattern",
"defaultValue": "Rectangles",
"selections": [
{
"id": "Circles",
"title": "Circles"
},
{
"id": "Rectangles",
"title": "Rectangles"
},
{
"id": "Triangles",
"title": "Triangles"
}
]
},
{
"id": "backColorId",
"type": "color",
"title": "Back Color",
"defaultValue": "#E5E5F7"
},
{
"id": "frontColorId",
"type": "color",
"title": "Front Color",
"defaultValue": "#444CF7"
},
{
"id": "spacingId",
"type": "number",
"title": "Spacing",
"defaultValue": "25",
"min": "1",
"max": "100",
"step": "0.1",
"unit": "unit",
"format": "0.1"
}
],
"groups": [
{
"id": "group1Id",
"title": "Pattern Options",
"width": "single",
"toolTip": "Select a Pattern and modify options",
"childIds": ["patternId", "backColorId", "frontColorId", "spacingId"]
}
]
}
}Widget code
The widget loads and uses the tinycolor.js library to convert various color values (RGB, HEX, HSL, RGBA, or HSLA) to HEX color definition.
output.html
<!DOCTYPE html>
<html>
<head>
<style>
/* Default widget style to make output match the bouding box */
html,
body {
background: none;
margin: 0;
padding: 0;
height: 100%;
overflow: hidden;
}
/* Add your custom styles here */
</style>
</head>
<body>
<!-- Your custom html goes here -->
<div id="pattern" style="position: absolute; left:0%; top:0%; width: 100%; height: 100%"></div>
<!-- Singular Widget Library -->
<script src="https://app.singular.live/libs/singularwidget/1.0.4/singularwidget.js"></script>
<!-- Load tinycolor library from cloudflare cdn -->
<script src="https://cdnjs.cloudflare.com/ajax/libs/tinycolor/1.5.2/tinycolor.min.js" integrity="sha512-gV2/CUt/1tn0eFseTyMjNqZU3kvhXacxA5eFoTwTd9c4b/Ems0BF00LOG/KcWnGZRdo62tqYNS8IiKtU4PGVoA==" crossorigin="anonymous" referrerpolicy="no-referrer"></script>
<script>
let windowWidth = 0;
let windowHeight = 0;
let elePattern = undefined;
let patternChanged = false;
let pattern = "Rectangles";
let spacing = 50;
let bgColor = "#E5E5F7";
let fgColor = "#444CF7";
// we define pattern styles in a map
const patternStyles = {
"Circles": {
draw: (params) => {
const cssBgImage = "radial-gradient(circle at center center, {{fgColor}}, {{bgColor}}), repeating-radial-gradient(circle at center center, {{fgColor}}, {{fgColor}}, {{spacing}}%, transparent {{spacing2x}}%, transparent {{spacing}}%)";
elePattern.style.backgroundImage = cssBgImage.replaceAll("{{fgColor}}", params.fgColor).replaceAll("{{bgColor}}", params.bgColor).replaceAll("{{spacing2x}}", params.spacing * 2).replaceAll("{{spacing}}", params.spacing);
elePattern.style.backgroundBlendMode = "multiply";
}
},
"Rectangles": {
draw: (params) => {
const cssBackground = "repeating-conic-gradient({{bgColor}} 0% 25%, {{fgColor}} 0% 50%) 50%/{{spacing}}vw {{spacing}}vh";
elePattern.style.background = cssBackground.replaceAll("{{fgColor}}", params.fgColor).replaceAll("{{bgColor}}", params.bgColor).replaceAll("{{spacing}}", params.spacing);
}
},
"Triangles": {
draw: (params) => {
const cssBackground = "conic-gradient(from 26.56505deg, {{bgColor}} 0% 63.43495deg, {{fgColor}} 0% 126.8699deg, {{bgColor}} 0% 50%, {{fgColor}} 0% 243.43495deg, {{bgColor}} 0% 306.8699deg, {{fgColor}} 0%) 0 0/ calc(9/16*{{spacing}}vh) {{spacing}}vh";
elePattern.style.background = cssBackground.replaceAll("{{fgColor}}", params.fgColor).replaceAll("{{bgColor}}", params.bgColor).replaceAll("{{spacing}}", params.spacing);
}
}
};
/**
* initialize Singular widget object and define callback functions
*/
SingularWidget.init({
onInit: onSingularInit,
onValue: onSingularValue
});
/**
* addEventListener for window resizing
* relevant when your widget displays HTML content or uses widget compositions
*/
window.addEventListener("resize", function() {
if (windowWidth != window.innerWidth || windowHeight != window.innerHeight) {
windowWidth = window.innerWidth;
windowHeight = window.innerHeight;
}
});
/**
* onSingularInit()
* called when the widget instance is created
*/
function onSingularInit(params) {
console.log("onSingularInit() - SingularWidget =", SingularWidget);
console.log("onSingularInit() - params =", params);
windowWidth = window.innerWidth;
windowHeight = window.innerHeight;
elePattern = document.getElementById('pattern');
}
/**
* onSingularValue()
* called when the widget instance is created or the instance data is changed
*/
function onSingularValue(json) {
console.log("onSingularValue() - json =", json);
patternChanged = false;
if (json.patternId !== undefined && json.patternId != pattern) {
pattern = json.patternId;
patternChanged = true;
}
if (json.spacingId !== undefined && Number(json.spacingId) != spacing) {
spacing = Number(json.spacingId);
patternChanged = true;
}
const newBgColor = tinycolor(json.backColorId).toHex8String();
if (json.backColorId !== undefined && newBgColor != bgColor) {
bgColor = newBgColor;
patternChanged = true;
}
const newFgColor = tinycolor(json.frontColorId).toHex8String();
if (json.frontColorId !== undefined && newFgColor != fgColor) {
fgColor = newFgColor;
patternChanged = true;
}
if (patternChanged === true) {
redrawPattern({
spacing: spacing,
bgColor: bgColor,
fgColor: fgColor
});
}
}
/**
* redrawPattern()
*/
const redrawPattern = function(params) {
// we reset all style properties
elePattern.style.background = "";
elePattern.style.backgroundImage = "";
elePattern.style.backgroundPosition = "";
elePattern.style.backgroundSize = "";
elePattern.style.backgroundBlendMode = "";
// draw pattern
patternStyles[pattern].draw(params);
}
</script>
</body>
</html>Last updated
