Add card graphics

CHANGELOG.md

@@ -1,6 +1,6 @@
 ## [`master`](https://github.com/elastic/eui/tree/master)
 
-No public interface changes since `5.3.0`.
+- Added `bottomGraphic` prop to `EuiCard` for Kibana home page ([#1338](https://github.com/elastic/eui/pull/1338))
 
 ## [`5.3.0`](https://github.com/elastic/eui/tree/v5.3.0)
 

src/components/card/_card.scss

@@ -21,6 +21,7 @@ $euiCardTitleSize: 18px; // Hardcoded pixel value for theme parity.
   flex-direction: column;
   padding: $euiCardSpacing;
   min-height: 1px; /* 2 */
+  position: relative;
 
   // This creates a bunch of sub selectors for the beta badge
   @include hasBetaBadge($selector: 'euiCard', $spacing: $euiCardSpacing); // sass-lint:disable-line mixins-before-declarations
@@ -60,6 +61,10 @@ $euiCardTitleSize: 18px; // Hardcoded pixel value for theme parity.
       }
     }
   }
+
+  &.euiCard--hasBottomGraphic {
+    padding-bottom: $euiCardSpacing + $euiSizeXXL;
+  }
 }
 
 .euiCard__top {
@@ -144,3 +149,14 @@ $euiCardTitleSize: 18px; // Hardcoded pixel value for theme parity.
     margin-right: $euiSize;
   }
 }
+
+// Optional decorative graphics
+.euiCard__graphicBottom {
+  position: absolute;
+  bottom: 0;
+  left: 0;
+  height: $euiSizeXXL;
+  width: 100%;
+  overflow: hidden;
+  border-radius: 0 0 $euiBorderRadius $euiBorderRadius;
+}

src/components/card/card.js

@@ -15,6 +15,14 @@ const textAlignToClassNameMap = {
 
 export const ALIGNMENTS = Object.keys(textAlignToClassNameMap);
 
+const graphicColorsToCodes = [
+  { color: 'blue', start: '#0079A5', end: '#3185FC', path: 'M3.79856147e-10,22.9906998 C127.450324,22.9906998 159.656579,4 213.348797,4 C267.041016,4 288.265625,13.4882812 700,17.0470661 L700,40 L108.569037,40 L0,40 L3.79856147e-10,22.9906998 Z', pathLight: 'M1.35371469e-08,7.95601173 C127.450324,7.95601173 102.647209,17.9667644 174.198268,17.9667644 C245.749327,17.9667644 298.768469,2.23349117e-13 700,1.42108547e-14 L700,37 C700,38.6568542 358.656854,40 357,40 L108.569037,40 L3,40 C1.34314575,40 -3.74826549e-09,38.6568543 -4.14273948e-09,37 L1.35371469e-08,7.95601173 Z' }, // eslint-disable-line  max-len
+  { color: 'green', start: '#017F75', end: '#00B3A4', path: 'M3.14689825e-06,13.6239758 C26.8316503,17.6239758 55.6152344,25 116.542969,25 C177.470703,25 263.972656,4 297.017578,4 C330.0625,4 348.589288,7.23392617 700.000003,9 L700.000003,40 L108.56904,40 L3.14689058e-06,40 L3.14689825e-06,13.6239758 Z', pathLight: 'M3.1372994e-06,24.4746094 C127.450326,24.4746094 108.698941,3 180.25,3 C251.801058,3 298.76847,17.4941406 700,17.4941406 L700.000003,40 L108.569039,39.5058594 L3.01365718,39.9862837 C1.35682009,39.9938246 0.00757513054,38.6568059 3.42096185e-05,36.9999688 C1.34947659e-05,36.9954175 3.13729938e-06,36.9908661 3.13729938e-06,36.9863147 L3.1372994e-06,24.4746094 Z' }, // eslint-disable-line  max-len
+  { color: 'purple', start: '#490092', end: '#DD0A73', path: 'M0,5 C85.1894531,9 157.96592,25.9853066 223.281971,25.9853638 C288.598022,25.9854211 306.490234,12.5448566 700,12.5448566 L700,40 L108.569037,40 L0,40 L0,5 Z', pathLight: 'M700,21.4746094 L700,40 L1.76214598e-12,40 L1.12746648e-08,18.4941406 C9.35694419,18.5359805 41.1418261,21.0181774 102.519531,21.4746094 C163.897236,21.9310414 216.210205,5 260.105102,5 C304,5 339.77443,21.6752984 700,21.4746094 Z' }, // eslint-disable-line  max-len
+];
+
+export const GRAPHIC_COLORS = graphicColorsToCodes.map(function (colorObj) {return colorObj.color;});
+
 const layoutToClassNameMap = {
   vertical: '',
   horizontal: 'euiCard--horizontal',
@@ -54,6 +62,8 @@ export const EuiCard = ({
   betaBadgeTooltipContent,
   betaBadgeTitle,
   layout,
+  bottomGraphic,
+  bottomGraphicColor,
   ...rest,
 }) => {
   const classes = classNames(
@@ -64,6 +74,7 @@ export const EuiCard = ({
       'euiCard--isClickable': onClick || href || isClickable,
       'euiCard--hasBetaBadge': betaBadgeLabel,
       'euiCard--hasIcon': icon,
+      'euiCard--hasBottomGraphic': bottomGraphic,
     },
     className,
   );
@@ -124,6 +135,45 @@ export const EuiCard = ({
     );
   }
 
+  let optionalBottomGraphic;
+  let graphicStartColor;
+  let graphicEndColor;
+  let graphicSVGPath;
+  let graphicSVGPathLight;
+  if (bottomGraphic) {
+    // Set the svg gradient colors
+    graphicStartColor = graphicColorsToCodes.find(w => w.color === bottomGraphicColor).start;
+    graphicEndColor = graphicColorsToCodes.find(x => x.color === bottomGraphicColor).end;
+    graphicSVGPath = graphicColorsToCodes.find(y => y.color === bottomGraphicColor).path;
+    graphicSVGPathLight = graphicColorsToCodes.find(z => z.color === bottomGraphicColor).pathLight;
+
+    optionalBottomGraphic = (
+      <span className="euiCard__graphicBottom">
+        <svg xmlns="http://www.w3.org/2000/svg" width="700" height="40" viewBox="0 0 700 40" preserveAspectRatio="none">
+          <defs>
+            <linearGradient id={`wave-light-${bottomGraphicColor}`} x1="50%" x2="50%" y1="10%" y2="60%">
+              <stop offset="0%" stopColor="#EFEFEF" stopOpacity=".05"/>
+              <stop offset="75%" stopColor="#444" stopOpacity=".11"/>
+            </linearGradient>
+            <linearGradient id={`wave-${bottomGraphicColor}`} x1="0%" y1="50%" y2="50%">
+              <stop offset="0%" stopColor={graphicStartColor} />
+              <stop offset="40%" stopColor={graphicEndColor} />
+            </linearGradient>
+          </defs>
+          <g fill="none" fillRule="evenodd">
+            <path fill={`url(#wave-light-${bottomGraphicColor})`} fillRule="evenodd" d={graphicSVGPathLight}/>
+            <path
+              fill={`url(#wave-${bottomGraphicColor})`}
+              fillOpacity=".83"
+              fillRule="evenodd"
+              d={graphicSVGPath}
+            />
+          </g>
+        </svg>
+      </span>
+    );
+  }
+
   return (
     <OuterElement
       onClick={onClick}
@@ -152,6 +202,8 @@ export const EuiCard = ({
           {footer}
         </span>
       }
+
+      {optionalBottomGraphic}
     </OuterElement>
   );
 };
@@ -209,10 +261,18 @@ EuiCard.propTypes = {
    * Optional title will be supplied as tooltip title or title attribute otherwise the label will be used
    */
   betaBadgeTitle: PropTypes.string,
+
+  /**
+   * Add a decorative bottom graphic to the card
+   * This should be used sparingly, consult the Kibana design team before use
+   */
+  bottomGraphic: PropTypes.bool,
+  bottomGraphicColor: PropTypes.oneOf(GRAPHIC_COLORS),
 };
 
 EuiCard.defaultProps = {
   textAlign: 'center',
   layout: 'vertical',
   titleElement: 'span',
+  bottomGraphicColor: 'blue',
 };