Dashboard: Tooltip for balance on a particular day (#5650)

Closes #5617.

BTCPayServer/Components/StoreWalletBalance/Default.cshtml

@@ -64,13 +64,14 @@
             
             const id = `StoreWalletBalance-${storeId}`;
             const baseUrl = @Safe.Json(Url.Action("WalletHistogram", "UIWallets", new { walletId = Model.WalletId, type = WalletHistogramType.Week }));
+            const valueTransform = value => rate
+                ? DashboardUtils.displayDefaultCurrency(value, rate, defaultCurrency, divisibility).toString()
+                : value
             const chartOpts = {
                 fullWidth: true,
                 showArea: true,
                 axisY: {
-                    labelInterpolationFnc: value => rate
-                        ? DashboardUtils.displayDefaultCurrency(value, rate, defaultCurrency, divisibility).toString()
-                        : value
+                    labelInterpolationFnc: valueTransform
                 }
             };
             
@@ -80,16 +81,22 @@
                 document.querySelectorAll(`#${id} .currency`).forEach(c => c.innerText = currency) 
                 document.querySelectorAll(`#${id} [data-balance]`).forEach(c => {
                     const value = Number.parseFloat(c.dataset.balance);
-                    c.innerText = rate
-                        ? DashboardUtils.displayDefaultCurrency(value, rate, currency, divisibility)
-                        : value
+                    c.innerText = valueTransform(value)
                 });
                 if (!series) return;
                 
                 const min = Math.min(...series);
                 const max = Math.max(...series);
                 const low = Math.max(min - ((max - min) / 5), 0);
-                const renderOpts = Object.assign({}, chartOpts, { low });
+                const tooltip = Chartist.plugins.tooltip2({
+                    template: '{{value}}',
+                    offset: {
+                        x: 0,
+                        y: -16
+                    },
+                    valueTransformFunction: valueTransform
+                })
+                const renderOpts = Object.assign({}, chartOpts, { low, plugins: [tooltip] });
                 const chart = new Chartist.Line(`#${id} .ct-chart`, {
                     labels,
                     series: [series]

BTCPayServer/Views/UIStores/Dashboard.cshtml

@@ -24,7 +24,9 @@
 {
     /* include chart library inline so that it instantly renders */
     <link rel="stylesheet" href="~/vendor/chartist/chartist.css" asp-append-version="true">
+    <link rel="stylesheet" href="~/vendor/chartist/chartist-plugin-tooltip.css" asp-append-version="true">
     <script src="~/vendor/chartist/chartist.min.js" asp-append-version="true"></script>
+    <script src="~/vendor/chartist/chartist-plugin-tooltip.js" asp-append-version="true"></script>
     <script>
         const DashboardUtils = {
             toDefaultCurrency(amount, rate) {

BTCPayServer/wwwroot/vendor/chartist/chartist-plugin-tooltip.css

@@ -0,0 +1,58 @@
+/**
+ * Chartist.js plugin to display a tooltip on top of a chart.
+ * @author  Antonia Ciocodeica
+ * @version 0.1 22 Nov 2016
+ */
+.chartist-tooltip {
+    position: absolute;
+    left: 0;
+    top: 0;
+    z-index: 1000;
+    display: block;
+    padding: var(--btcpay-space-xs) var(--btcpay-space-s);
+    visibility: hidden;
+    transform: translateY(3em);
+    opacity: 0;
+    border-radius: var(--btcpay-border-radius);
+    border: 1px solid var(--btcpay-body-border-light);
+    color: var(--btcpay-body-text);
+    background-color: var(--btcpay-bg-tile);
+    transition: transform var(--btcpay-transition-duration-fast) ease-in-out;
+}
+.chartist-tooltip:not([hidden]) {
+    margin: 0;
+    visibility: visible;
+    transform: none;
+    opacity: 1;
+}
+
+/* Tooltip arrow */
+.chartist-tooltip::before {
+    content: '\25BC';
+    position: absolute;
+    left: calc(50% - .5em);
+    top: 100%;
+    z-index: -1;
+    font-size: 1.3em;
+    line-height: .5em;
+    font-family: Arial, sans-serif;
+    color: var(--btcpay-body-border-light);
+    transform: scaleY(0.7);
+    text-shadow: 0 0.25em 0.35em rgba(0, 0, 0, 0.1);
+}
+.chartist-tooltip--left::before {
+    left: 0.75em;
+}
+.chartist-tooltip--right::before {
+    left: auto;
+    right: 0.75em;
+}
+
+/* Adds a small point transition (line charts) when the point is active */
+.ct-point {
+    transition: all 0.2s ease-in-out;
+}
+/* Increased specificity intended to overwrite the default chartist style */
+.ct-chart-line.ct-chart-line .ct-point--hover {
+    stroke-width: 1.25em;
+}