feat(interaction): emit slider filter

__tests__/integration/api-chart-emit-legend-filter.spec.ts

@@ -4,7 +4,7 @@ import { sleep } from './utils/sleep';
 import { kebabCase } from './utils/kebabCase';
 import './utils/useSnapshotMatchers';
 
-describe('chart.options.autoFit', () => {
+describe('chart.emit', () => {
   const dir = `${__dirname}/snapshots/api/${kebabCase(render.name)}`;
   const canvas = createNodeGCanvas(800, 500);
   let chart;

__tests__/integration/api-chart-emit-slider-filter.spec.ts

@@ -0,0 +1,76 @@
+import { chartEmitSliderFilter as render } from '../plots/api/chart-emit-slider-filter';
+import { createNodeGCanvas } from './utils/createNodeGCanvas';
+import { sleep } from './utils/sleep';
+import { kebabCase } from './utils/kebabCase';
+import './utils/useSnapshotMatchers';
+import { SLIDER_CLASS_NAME } from '../../src/interaction/sliderFilter';
+import { dispatchValueChange } from '../plots/tooltip/appl-line-slider-filter';
+import { createPromise } from './utils/event';
+
+describe('chart.emit', () => {
+  const dir = `${__dirname}/snapshots/api/${kebabCase(render.name)}`;
+  const canvas = createNodeGCanvas(800, 500);
+
+  it('chart.on("slider:filter") should receive expected data.', async () => {
+    const { chart, finished } = render({
+      canvas,
+      container: document.createElement('div'),
+    });
+    await finished;
+    await sleep(20);
+
+    const [SX, SY] = Array.from(
+      canvas.document.getElementsByClassName(SLIDER_CLASS_NAME),
+    );
+
+    // chart.emit('sliderX:filter', options) should trigger slider.
+    const X = ['2001-01', '2001-03'];
+    chart.emit('sliderX:filter', {
+      data: { selection: [X, undefined] },
+    });
+    await sleep(100);
+    await expect(canvas).toMatchCanvasSnapshot(dir, 'step0');
+
+    // chart.emit('sliderY:filter', options) should trigger slider.
+    const Y = [50, 550];
+    chart.emit('sliderY:filter', {
+      data: { selection: [undefined, Y] },
+    });
+    await sleep(100);
+    await expect(canvas).toMatchCanvasSnapshot(dir, 'step1');
+
+    chart.off();
+
+    // chart.on("sliderX:filter") should receive expected data.
+    const [filteredX, resolveX] = createPromise();
+    chart.on('sliderX:filter', (event) => {
+      if (!event.nativeEvent) return;
+      expect(event.data.selection).toEqual([
+        ['2001-05', '2002-03'],
+        [50, 550],
+      ]);
+      resolveX();
+    });
+    dispatchValueChange(SX);
+    await sleep(20);
+    await filteredX;
+
+    // chart.on("sliderY:filter") should receive expected data.
+    const [filteredY, resolveY] = createPromise();
+    chart.on('sliderY:filter', (event) => {
+      if (!event.nativeEvent) return;
+      expect(event.data.selection).toEqual([
+        ['2001-05', '2002-03'],
+        [150, 450],
+      ]);
+      resolveY();
+    });
+    dispatchValueChange(SY);
+    await sleep(20);
+    await filteredY;
+  });
+
+  afterAll(() => {
+    canvas?.destroy();
+  });
+});

__tests__/plots/api/chart-emit-slider-filter.ts

@@ -0,0 +1,91 @@
+import { Chart } from '../../../src';
+
+export function chartEmitSliderFilter(context) {
+  const { container, canvas } = context;
+
+  // button
+  const buttonX = document.createElement('button');
+  buttonX.innerText = 'FilterX';
+  container.appendChild(buttonX);
+
+  const buttonY = document.createElement('button');
+  buttonY.innerText = 'FilterY';
+  container.appendChild(buttonY);
+
+  // wrapperDiv
+  const wrapperDiv = document.createElement('div');
+  container.appendChild(wrapperDiv);
+
+  const chart = new Chart({
+    theme: 'classic',
+    container: wrapperDiv,
+    paddingLeft: 80,
+    paddingBottom: 120,
+    canvas,
+  });
+
+  chart.options({
+    type: 'interval',
+    data: [
+      { date: '2001-01', value: 100 },
+      { date: '2001-02', value: 400 },
+      { date: '2001-03', value: 500 },
+      { date: '2001-04', value: 600 },
+      { date: '2001-05', value: 300 },
+      { date: '2001-06', value: 600 },
+      { date: '2001-07', value: 300 },
+      { date: '2001-08', value: 600 },
+      { date: '2001-09', value: 109 },
+      { date: '2001-10', value: 100 },
+      { date: '2001-11', value: 102 },
+      { date: '2001-12', value: 103 },
+      { date: '2002-01', value: 102 },
+      { date: '2002-02', value: 101 },
+      { date: '2002-03', value: 200 },
+      { date: '2002-04', value: 500 },
+      { date: '2002-05', value: 100 },
+      { date: '2002-06', value: 100 },
+      { date: '2002-07', value: 102 },
+      { date: '2002-08', value: 109 },
+    ],
+    encode: { x: 'date', y: 'value' },
+    axis: { x: { size: 100, style: { labelTransform: 'rotate(90)' } } },
+    slider: { x: {}, y: { labelFormatter: (d) => +d.toFixed(1) + '' } },
+  });
+
+  const finished = chart.render();
+
+  chart.on('sliderX:filter', (event) => {
+    const { data, nativeEvent } = event;
+    if (nativeEvent) console.log('sliderX:filter', data);
+  });
+
+  chart.on('sliderY:filter', (event) => {
+    const { data, nativeEvent } = event;
+    if (nativeEvent) console.log('sliderY:filter', data);
+  });
+
+  let resolveX;
+  const filterX = new Promise((r) => (resolveX = r));
+
+  buttonX.onclick = () => {
+    const X = ['2001-01', '2001-03'];
+    chart.emit('sliderX:filter', {
+      data: { selection: [X, undefined] },
+    });
+    resolveX();
+  };
+
+  let resolveY;
+  const filterY = new Promise((r) => (resolveY = r));
+
+  buttonY.onclick = () => {
+    const Y = [50, 550];
+    chart.emit('sliderY:filter', {
+      data: { selection: [undefined, Y] },
+    });
+    resolveY();
+  };
+
+  return { chart, buttonX, buttonY, finished, filterX, filterY };
+}

__tests__/plots/api/index.ts

@@ -25,3 +25,4 @@ export { chartRenderUpdateNonAnimation } from './chart-render-update-non-animati
 export { chartEmitBrushHighlightX } from './chart-emit-brush-highlight-x';
 export { chartRenderBrushEnd } from './chart-render-brush-end';
 export { chartChangeDataEmpty } from './chart-change-data-empty';
+export { chartEmitSliderFilter } from './chart-emit-slider-filter';

__tests__/plots/static/cars3-line-parallel-horizontal.ts

@@ -17,6 +17,7 @@ export function cars3LineParallelHorizontal(): G2Spec {
       type: 'fetch',
       value: 'data/cars3.csv',
     },
+    interaction: { tooltip: { series: false } },
     coordinate: { type: 'parallel' },
     encode: {
       position,

__tests__/plots/static/cars3-line-parallel-vertical.ts

@@ -17,6 +17,7 @@ export function cars3LineParallelVertical(): G2Spec {
       type: 'fetch',
       value: 'data/cars3.csv',
     },
+    interaction: { tooltip: { series: false } },
     coordinate: { type: 'parallel', transform: [{ type: 'transpose' }] },
     encode: {
       position,

__tests__/plots/tooltip/appl-line-slider-filter.ts

@@ -31,6 +31,7 @@ export function dispatchValueChange(slider, values = [0.25, 0.75]) {
   slider.update({ values });
   slider.dispatchEvent(
     new CustomEvent('valuechange', {
+      nativeEvent: true,
       detail: {
         value: [0.25, 0.75],
       },

site/docs/spec/interaction/sliderFilter.zh.md

@@ -31,3 +31,31 @@ chart
 
 chart.render();
 ```
+
+## 案例
+
+### 触发事件
+
+```js
+chart.emit('sliderX:filter', {
+  data: { selection: [['2001-01', '2001-03'], undefined] },
+});
+
+chart.emit('sliderY:filter', {
+  data: { selection: [undefined, [50, 550]] },
+});
+```
+
+### 监听数据
+
+```js
+chart.on('sliderX:filter', (event) => {
+  const { data, nativeEvent } = event;
+  if (nativeEvent) console.log('sliderX:filter', data.selection);
+});
+
+chart.on('sliderY:filter', (event) => {
+  const { data, nativeEvent } = event;
+  if (nativeEvent) console.log('sliderY:filter', data.selection);
+});
+```

src/interaction/sliderFilter.ts

@@ -1,6 +1,7 @@
-import { deepMix, throttle } from '@antv/util';
+import { deepMix, throttle, upperFirst } from '@antv/util';
+import { CustomEvent } from '@antv/g';
 import { isTranspose } from '../utils/coordinate';
-import { invert, domainOf } from '../utils/scale';
+import { invert, domainOf, abstractOf } from '../utils/scale';
 
 export const SLIDER_CLASS_NAME = 'slider';
 
@@ -45,6 +46,10 @@ function abstractValue(values, scale, reverse) {
   return domainOf(scale, [d0, d1]);
 }
 
+function extentOf(domain) {
+  return [domain[0], domain[domain.length - 1]];
+}
+
 /**
  * @todo Support click to reset after fix click and dragend conflict.
  */
@@ -53,7 +58,7 @@ export function SliderFilter({
   leading = true,
   trailing = false,
 }: any) {
-  return (context) => {
+  return (context, _, emitter) => {
     const { container, view, options, update } = context;
     const sliders = container.getElementsByClassName(SLIDER_CLASS_NAME);
     if (!sliders.length) return () => {};
@@ -71,6 +76,7 @@ export function SliderFilter({
     };
 
     const sliderHandler = new Map();
+    const emitHandlers = new Set<[string, (event: any) => void]>();
 
     // Store current domain of x and y scale.
     const channelDomain = {
@@ -80,47 +86,103 @@ export function SliderFilter({
 
     for (const slider of sliders) {
       const { orientation } = slider.attributes;
+      const [channel0, channel1] = channelOf(orientation);
+      const eventName = `slider${upperFirst(channel0)}:filter`;
+      const isX = channel0 === 'x';
+      const domainsOf = (event) => {
+        // From abstract values.
+        if (event.data) {
+          const { selection } = event.data;
+          const [X = extentOf(channelDomain.x), Y = extentOf(channelDomain.y)] =
+            selection;
+          return isX
+            ? [domainOf(scaleX, X), domainOf(scaleY, Y)]
+            : [domainOf(scaleY, Y), domainOf(scaleX, X)];
+        }
+
+        // From visual values.
+        const { value: values } = event.detail;
+        const scale0 = scale[channel0];
+        const domain0 = abstractValue(
+          values,
+          scale0,
+          transposed && orientation === 'horizontal',
+        );
+        const domain1 = channelDomain[channel1];
+        return [domain0, domain1];
+      };
 
       const onValueChange = throttle(
         async (event) => {
-          const { value: values } = event.detail;
           if (filtering) return;
           filtering = true;
 
-          const [channel0, channel1] = channelOf(orientation);
+          const { nativeEvent = true } = event;
 
-          // Update domain of the current channel.
-          const scale0 = scale[channel0];
-          const domain0 = abstractValue(
-            values,
-            scale0,
-            transposed && orientation === 'horizontal',
-          );
+          // Get and update domain.
+          const [domain0, domain1] = domainsOf(event);
           channelDomain[channel0] = domain0;
-
-          // Get domain of the other channel.
-          const domain1 = channelDomain[channel1];
+          channelDomain[channel1] = domain1;
 
           // Filter data.
           const newOptions = filterDataByDomain(options, {
             [channel0]: { domain: domain0 },
             [channel1]: { domain: domain1 },
           });
+
+          if (nativeEvent) {
+            // Emit events.
+            const X = isX ? domain0 : domain1;
+            const Y = isX ? domain1 : domain0;
+            emitter.emit(eventName, {
+              ...event,
+              nativeEvent,
+              data: { selection: [extentOf(X), extentOf(Y)] },
+            });
+          }
+
           await update(newOptions);
           filtering = false;
         },
         wait,
         { leading, trailing },
       );
 
+      const emitHandler = (event) => {
+        const { nativeEvent } = event;
+        if (nativeEvent) return;
+
+        const { data } = event;
+        const { selection } = data;
+        const [X, Y] = selection;
+
+        // Update data.
+        slider.dispatchEvent(
+          new CustomEvent('valuechange', {
+            data,
+            nativeEvent: false,
+          }),
+        );
+
+        // Update slider.
+        const V = isX ? abstractOf(X, scaleX) : abstractOf(Y, scaleY);
+        slider.setValues(V);
+      };
+
+      emitter.on(eventName, emitHandler);
+
       slider.addEventListener('valuechange', onValueChange);
       sliderHandler.set(slider, onValueChange);
+      emitHandlers.add([eventName, emitHandler]);
     }
 
     return () => {
       for (const [slider, handler] of sliderHandler) {
         slider.removeEventListener('valuechange', handler);
       }
+      for (const [name, handler] of emitHandlers) {
+        emitter.off(name, handler);
+      }
     };
   };
 }