fix(datetime): recalculate day column when month is changed

core/src/components/datetime/datetime.tsx

@@ -261,11 +261,36 @@ export class Datetime implements ComponentInterface {
 
     const pickerOptions = this.generatePickerOptions();
     const picker = await this.pickerCtrl.create(pickerOptions);
+
     this.isExpanded = true;
     picker.onDidDismiss().then(() => {
       this.isExpanded = false;
       this.setFocus();
     });
+    picker.addEventListener('ionPickerColChange', async (event: any) => {
+      const data = event.detail;
+
+      /**
+       * Don't bother checking for non-dates as things like hours or minutes
+       * are always going to have the same number of column options
+       */
+      if (data.name !== 'month' && data.name !== 'day' && data.name !== 'year') { return; }
+
+      const colSelectedIndex = data.selectedIndex;
+      const colOptions = data.options;
+
+      const changeData: any = {};
+      changeData[data.name] = {
+        value: colOptions[colSelectedIndex].value
+      };
+
+      this.updateDatetimeValue(changeData);
+      const columns = this.generateColumns();
+
+      picker.columns = columns;
+
+      await this.validate(picker);
+    });
     await this.validate(picker);
     await picker.present();
   }
@@ -300,6 +325,7 @@ export class Datetime implements ComponentInterface {
           text: this.cancelText,
           role: 'cancel',
           handler: () => {
+            this.updateDatetimeValue(this.value);
             this.ionCancel.emit();
           }
         },

core/src/components/picker-column/picker-column.tsx

@@ -1,4 +1,4 @@
-import { Component, ComponentInterface, Element, Prop, QueueApi } from '@stencil/core';
+import { Component, ComponentInterface, Element, Event, EventEmitter, Prop, QueueApi, Watch } from '@stencil/core';
 
 import { Gesture, GestureDetail, Mode, PickerColumn } from '../../interface';
 import { hapticSelectionChanged } from '../../utils/haptic';
@@ -36,8 +36,18 @@ export class PickerColumnCmp implements ComponentInterface {
 
   @Prop({ context: 'queue' }) queue!: QueueApi;
 
+  /**
+   * Emitted when the selected value has changed
+   * @internal
+   */
+  @Event() ionPickerColChange!: EventEmitter<PickerColumn>;
+
   /** Picker column data */
   @Prop() col!: PickerColumn;
+  @Watch('col')
+  protected colChanged() {
+    this.refresh();
+  }
 
   componentWillLoad() {
     let pickerRotateFactor = 0;
@@ -88,6 +98,10 @@ export class PickerColumnCmp implements ComponentInterface {
     }
   }
 
+  private emitColChange() {
+    this.ionPickerColChange.emit(this.col);
+  }
+
   private setSelected(selectedIndex: number, duration: number) {
     // if there is a selected index, then figure out it's y position
     // if there isn't a selected index, then just use the top y position
@@ -98,6 +112,8 @@ export class PickerColumnCmp implements ComponentInterface {
     // set what y position we're at
     cancelAnimationFrame(this.rafId);
     this.update(y, duration, true);
+
+    this.emitColChange();
   }
 
   private update(y: number, duration: number, saveY: boolean) {
@@ -207,6 +223,9 @@ export class PickerColumnCmp implements ComponentInterface {
       if (notLockedIn) {
         // isn't locked in yet, keep decelerating until it is
         this.rafId = requestAnimationFrame(() => this.decelerate());
+      } else {
+        this.velocity = 0;
+        this.emitColChange();
       }
 
     } else if (this.y % this.optHeight !== 0) {
@@ -277,10 +296,12 @@ export class PickerColumnCmp implements ComponentInterface {
     if (this.bounceFrom > 0) {
       // bounce back up
       this.update(this.minY, 100, true);
+      this.emitColChange();
       return;
     } else if (this.bounceFrom < 0) {
       // bounce back down
       this.update(this.maxY, 100, true);
+      this.emitColChange();
       return;
     }
 
@@ -308,6 +329,15 @@ export class PickerColumnCmp implements ComponentInterface {
       }
     }
 
+    /**
+     * Only update selected value if column has a
+     * velocity of 0. If it does not, then the
+     * column is animating might land on
+     * a value different than the value at
+     * selectedIndex
+     */
+    if (this.velocity !== 0) { return; }
+
     const selectedIndex = clamp(min, this.col.selectedIndex || 0, max);
     if (this.col.prevSelected !== selectedIndex || forceRefresh) {
       const y = (selectedIndex * this.optHeight) * -1;

core/src/components/picker-column/test/standalone/e2e.ts

@@ -0,0 +1,19 @@
+import { testPickerColumn } from '../test.utils';
+
+const TEST_TYPE = 'standalone';
+
+test('picker-column: standalone', async () => {
+  await testPickerColumn(TEST_TYPE, '#single-column-button');
+});
+
+test('picker-column:multi-column standalone', async () => {
+  await testPickerColumn(TEST_TYPE, '#multiple-column-button');
+});
+
+test('picker-column:rtl: standalone', async () => {
+  await testPickerColumn(TEST_TYPE, '#single-column-button', true);
+});
+
+test('picker-column:multi-column:rtl standalone', async () => {
+  await testPickerColumn(TEST_TYPE, '#multiple-column-button', true);
+});

core/src/components/picker-column/test/standalone/index.html

@@ -0,0 +1,92 @@
+<!DOCTYPE html>
+<html dir="ltr">
+
+<head>
+  <meta charset="UTF-8">
+  <title>Picker Column - Standalone</title>
+  <meta name="viewport" content="width=device-width, initial-scale=1.0, minimum-scale=1.0, maximum-scale=1.0, user-scalable=no">
+  <link href="../../../../../css/core.css" rel="stylesheet">
+  <link href="../../../../../scripts/testing/styles.css" rel="stylesheet">
+  <script src="../../../../../scripts/testing/scripts.js"></script>
+  <script src="../../../../../dist/ionic.js"></script>
+</head>
+
+<body>
+  <ion-picker-controller></ion-picker-controller>
+  <ion-button onclick="openPicker()" id="single-column-button">Open Single Column Picker</ion-button>
+  <ion-button onclick="openPicker(2, 5, multiColumnOptions)" id="multiple-column-button">Open Multi Column Picker</ion-button>
+  <script>
+    const pickerController = document.querySelector('ion-picker-controller');
+    const defaultColumnOptions = [
+      [
+        'Dog',
+        'Cat',
+        'Bird',
+        'Lizard',
+        'Chinchilla'
+      ]
+    ]
+
+    const multiColumnOptions = [
+      [
+        'Minified',
+        'Responsive',
+        'Full Stack',
+        'Mobile First',
+        'Serverless'
+      ],
+      [
+        'Tomato',
+        'Avocado',
+        'Onion',
+        'Potato',
+        'Artichoke'
+      ]
+    ]
+
+    async function openPicker(numColumns = 1, numOptions = 5, columnOptions = defaultColumnOptions) {
+      const picker = await pickerController.create({
+        columns: this.getColumns(numColumns, numOptions, columnOptions),
+        buttons: [
+          {
+            text: 'Cancel',
+            role: 'cancel'
+          },
+          {
+            text: 'Confirm',
+            handler: (value) => {
+              console.log(`Got Value ${value}`);
+            }  
+          }
+        ]
+      });
+
+      await picker.present();
+    }
+
+    function getColumns(numColumns, numOptions, columnOptions) {
+      let columns = [];
+      for (let i = 0; i < numColumns; i++) {
+        columns.push({
+          name: `col-${i}`,
+          options: this.getColumnOptions(i, numOptions, columnOptions)
+        });
+      }
+
+      return columns;
+    }
+
+    function getColumnOptions(columnIndex, numOptions, columnOptions) {
+      let options = [];
+      for (let i = 0; i < numOptions; i++) {
+        options.push({
+          text: columnOptions[columnIndex][i % numOptions],
+          value: i
+        })
+      }
+
+      return options;
+    }
+  </script>
+</body>
+</html>

core/src/components/picker-column/test/test.utils.ts

@@ -0,0 +1,60 @@
+import { newE2EPage } from '@stencil/core/testing';
+
+import { cleanScreenshotName, dragElementBy, generateE2EUrl, listenForEvent, waitForFunctionTestContext } from '../../../utils/test/utils';
+
+export async function testPickerColumn(
+  type: string,
+  selector: string,
+  rtl = false,
+  screenshotName: string = cleanScreenshotName(selector)
+) {
+  try {
+    const pageUrl = generateE2EUrl('picker-column', type, rtl);
+    if (rtl) {
+      screenshotName = `${screenshotName} rtl`;
+    }
+
+    const page = await newE2EPage({
+      url: pageUrl
+    });
+
+    const screenshotCompares = [];
+
+    const openButton = await page.find(selector);
+    await openButton.click();
+    await page.waitFor(250);
+
+    screenshotCompares.push(await page.compareScreenshot(`${screenshotName}`));
+
+    // Setup counter
+    let colChangeCounter: any;
+
+    // Expose an event callback method
+    const COL_CHANGE = 'onIonPickerColChange';
+    await page.exposeFunction(COL_CHANGE, () => {
+      colChangeCounter.count += 1;
+    });
+
+    const columns = await page.$$('ion-picker-column');
+    for (const column of Array.from(columns)) {
+      colChangeCounter = { count: 0 };
+
+      // Attach a listener to element with a callback
+      await listenForEvent(page, 'ionPickerColChange', column, COL_CHANGE);
+
+      // Simulate a column drag
+      await dragElementBy(column, page, 0, 100);
+
+      // Wait for ionPickerColChange event to be emitted once
+      await waitForFunctionTestContext((payload: any) => {
+        return payload.colChangeCounter.count === 1;
+      }, { colChangeCounter });
+    }
+
+    for (const screenshotCompare of screenshotCompares) {
+      expect(screenshotCompare).toMatchScreenshot();
+    }
+  } catch (err) {
+    throw err;
+  }
+}

core/src/utils/test/utils.ts

@@ -13,3 +13,77 @@ export function cleanScreenshotName(screenshotName: string): string {
     .replace(/[^0-9a-zA-Z\s]/gi, '')
     .toLowerCase();
 }
+
+/**
+ * Listens for an event and fires a callback
+ * @param page - The Puppeteer `page` object
+ * @param eventType: string - The event name to listen for. ex: `ionPickerColChange`
+ * @param element: HTMLElement - An HTML element
+ * @param callbackName: string - The name of the callback function to
+ * call when the event is fired.
+ *
+ * Note: The callback function must be added using
+ * page.exposeFunction prior to calling this function.
+ */
+export const listenForEvent = async (page: any, eventType: string, element: any, callbackName: string): Promise<any> => {
+  try {
+      return await page.evaluate((scopeEventType: string, scopeElement: any, scopeCallbackName: string) => {
+        scopeElement.addEventListener(scopeEventType, (e: any) => {
+          (window as any)[scopeCallbackName](e);
+        });
+      }, eventType, element, callbackName);
+  } catch (err) {
+    throw err;
+  }
+};
+
+/**
+ * Drags an element by (x, y) pixels
+ * @param element: HTMLElement - The HTML Element to drag
+ * @param page - The Puppeteer 'page' object
+ * @param x: number - Amount to drag `element` by on the x-axis
+ * @param y: number - Amount to drag `element` by on the y-axis
+ */
+export const dragElementBy = async (element: any, page: any, x = 0, y = 0): Promise<void> => {
+  try {
+    const boundingBox = await element.boundingBox();
+
+    const startX = boundingBox.x + boundingBox.width / 2;
+    const startY = boundingBox.y + boundingBox.height / 2;
+
+    const endX = startX + x;
+    const endY = startY + y;
+
+    const midX = endX / 2;
+    const midY = endY / 2;
+
+    await page.mouse.move(startX, startY);
+    await page.mouse.down();
+    await page.mouse.move(midX, midY);
+    await page.mouse.move(endX, endY);
+    await page.mouse.up();
+
+  } catch (err) {
+    throw err;
+  }
+};
+
+/**
+ * Wait for a function to return true
+ * This method runs in the context of the
+ * test whereas page.waitForFunction runs in
+ * the context of the browser
+ * @param fn - The function to run
+ * @param params: any - Any parameters that the fn needs
+ * @param interval: number - Interval to run setInterval on
+ */
+export const waitForFunctionTestContext = async (fn: any, params: any, interval = 16): Promise<any> => {
+  return new Promise(resolve => {
+    const intervalId = setInterval(() => {
+      if (fn(params)) {
+        clearInterval(intervalId);
+        return resolve();
+      }
+    }, interval);
+  });
+};