feat(datetime): add animation to adjacent days selection (#30298)

Issue number: internal

---------

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issue. -->

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## What is the new behavior?
<!-- Please describe the behavior or changes that are being added by
this PR. -->
Now when an adjacent day is selected the component will scroll to the
pretended month, as it does when a month change via arrow buttons.

## Changes:
- add styles for active adjacent day;
- scroll animation when adjacentDay is selected;

## Does this introduce a breaking change?

- [ ] Yes
- [x] No

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1. Describe the impact and migration path for existing applications
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  2. Update the BREAKING.md file with the breaking change.
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## Other information

- [md
preview](https://ionic-framework-git-rou-11744-ionic1.vercel.app/src/components/datetime/test/show-adjacent-days?ionic:mode=md)
- [ios
preview](https://ionic-framework-git-rou-11744-ionic1.vercel.app/src/components/datetime/test/show-adjacent-days?ionic:mode=ios
)
<!-- Any other information that is important to this PR such as
screenshots of how the component looks before and after the change. -->

---------

Co-authored-by: Maria Hutt <thetaPC@users.noreply.github.com>
Co-authored-by: ionitron <hi@ionicframework.com>

core/src/components/datetime/datetime.ios.scss

@@ -251,7 +251,8 @@
  * is selected should have ion-color for
  * text color and be bolder.
  */
-:host .calendar-day.calendar-day-active {
+:host .calendar-day.calendar-day-active,
+:host .calendar-day.calendar-day-adjacent-day.calendar-day-active {
   color: current-color(base);
 
   font-weight: 600;

core/src/components/datetime/datetime.md.scss

@@ -117,7 +117,8 @@
  * is selected should have ion-color for
  * text color and be bolder.
  */
-:host .calendar-day.calendar-day-active {
+:host .calendar-day.calendar-day-active,
+:host .calendar-day.calendar-day-adjacent-day.calendar-day-active {
   color: current-color(contrast);
 }
 

core/src/components/datetime/datetime.tsx

@@ -2383,36 +2383,25 @@ export class Datetime implements ComponentInterface {
                     if (isAdjacentDay) {
                       // The user selected a day outside the current month. Ignore this button, as the month will be re-rendered.
                       this.el.blur();
-                    }
-
+                      this.activeParts = { ...activePart, ...referenceParts };
+                      this.animateToDate(referenceParts);
+                      this.confirm();
+                    } else {
                       this.setWorkingParts({
                         ...this.workingParts,
-                      month: _month,
-                      day,
-                      year: _year,
-                      isAdjacentDay,
+                        ...referenceParts,
                       });
 
-                    // multiple only needs date info, so we can wipe out other fields like time
+                      // Multiple only needs date info so we can wipe out other fields like time.
                       if (multiple) {
-                      this.setActiveParts(
-                        {
-                          month: _month,
-                          day,
-                          year: _year,
-                          isAdjacentDay,
-                        },
-                        isActive
-                      );
+                        this.setActiveParts(referenceParts, isActive);
                       } else {
                         this.setActiveParts({
                           ...activePart,
-                        month: _month,
-                        day,
-                        year: _year,
-                        isAdjacentDay,
+                          ...referenceParts,
                         });
                       }
+                    }
                   }}
                 >
                   {text}

core/src/components/datetime/test/show-adjacent-days/datetime.e2e.ts

@@ -47,5 +47,75 @@ configs({ directions: ['ltr'] }).forEach(({ title, screenshot, config }) => {
       const datetime = page.locator('#display');
       await expect(datetime).toHaveScreenshot(screenshot(`datetime-show-adjacent-days-display`));
     });
+
+    test('should return the same date format on current month days and on adjacent days', async ({ page }) => {
+      await page.setContent(
+        `
+        <ion-datetime show-adjacent-days="true" value="2022-10-14T16:22:00.000Z" presentation="date"></ion-datetime>
+      `,
+        config
+      );
+
+      // Wait for the datetime to be ready.
+      await page.locator('.datetime-ready').waitFor();
+
+      const ionChange = await page.spyOnEvent('ionChange');
+
+      const calendarMonthYear = page.locator('ion-datetime .calendar-month-year');
+
+      /**
+       * Make sure to exclude adjacent days from the query since
+       * the previous/next month is rendered hidden. This causes
+       * the query to possibly return different results: one for
+       * the current month and one from the hidden previous/next
+       * month.
+       */
+      const october20Button = page.locator(
+        '[data-month="10"][data-year="2022"][data-day="20"]:not(.calendar-day-adjacent-day)'
+      );
+
+      await october20Button.click();
+
+      await ionChange.next();
+      await expect(ionChange).toHaveReceivedEventDetail({
+        value: '2022-10-20T16:22:00',
+      });
+
+      const november1Button = page.locator(
+        '.calendar-day-adjacent-day[data-month="11"][data-year="2022"][data-day="1"]'
+      );
+
+      await november1Button.click();
+      // Wait for the datetime to change the month since an adjacent day
+      // was clicked.
+      await page.waitForChanges();
+
+      // Wait for the title to update to the new month since it changes
+      // after the month animation finishes.
+      await expect(calendarMonthYear).toHaveText('November 2022');
+
+      await ionChange.next();
+      await expect(ionChange).toHaveReceivedEventDetail({
+        value: '2022-11-01T16:22:00',
+      });
+
+      /**
+       * Make sure to exclude adjacent days from the query since
+       * the previous/next month is rendered hidden. This causes
+       * the query to possibly return different results: one for
+       * the current month and one from the hidden previous/next
+       * month.
+       */
+      const november22Button = page.locator(
+        '[data-month="11"][data-year="2022"][data-day="22"]:not(.calendar-day-adjacent-day)'
+      );
+
+      await november22Button.click();
+
+      await ionChange.next();
+      await expect(ionChange).toHaveReceivedEventDetail({
+        value: '2022-11-22T16:22:00',
+      });
+    });
   });
 });

core/src/components/datetime/test/show-adjacent-days/index.html

@@ -161,8 +161,20 @@
               <span>FirstDayOfWeek: <span id="start-of-week">1</span></span>
             </div>
           </div>
+
+          <div class="grid-item">
+            <h2>DateTime format with IonChange Event (console)</h2>
+            <ion-datetime
+              id="default2"
+              show-adjacent-days="true"
+              locale="en-US"
+              value="2022-10-14T16:22:00.000Z"
+              presentation="date"
+            ></ion-datetime>
           </div>
-        <div>
+        </div>
+        <div class="grid">
+          <div class="grid-item">
             <label for="presentation">Presentation</label>
             <select id="presentation" onchange="changePresentation(event)">
               <option value="date-time" selected>date-time</option>
@@ -178,6 +190,7 @@
             <br /><br />
             <ion-datetime show-adjacent-days="true" id="display" value="2022-02-22T16:30:00"></ion-datetime>
           </div>
+        </div>
       </ion-content>
     </ion-app>
 
@@ -305,6 +318,11 @@
       };
 
       initCalendarMonthChangeObserver();
+
+      const datetimeDefault = document.querySelector('#default2');
+      datetimeDefault.addEventListener('ionChange', (ev) => {
+        console.log(ev.target.value);
+      });
     </script>
   </body>
 </html>