fix(datetime): prevent navigating to disabled months

core/src/components/datetime/datetime.scss

@@ -241,6 +241,13 @@
   width: 100%;
 }
 
+:host .calendar-body .calendar-month-disabled {
+  /**
+   * Disables swipe gesture snapping for scroll-snap containers
+   */
+  scroll-snap-align: none;
+}
+
 /**
  * Hide scrollbars on Chrome and Safari
  */

core/src/components/datetime/datetime.tsx

@@ -56,7 +56,10 @@ import {
 } from './utils/parse';
 import {
   getCalendarDayState,
-  isDayDisabled
+  isDayDisabled,
+  isMonthDisabled,
+  isNextMonthDisabled,
+  isPrevMonthDisabled
 } from './utils/state';
 
 /**
@@ -714,6 +717,15 @@ export class Datetime implements ComponentInterface {
           return;
         }
 
+        const { month, year, day } = refMonthFn(this.workingParts);
+
+        if (isMonthDisabled({ month, year, day: null }, {
+          minParts: this.minParts,
+          maxParts: this.maxParts
+        })) {
+          return;
+        }
+
         /**
          * On iOS, we need to set pointer-events: none
          * when the user is almost done with the gesture
@@ -724,7 +736,8 @@ export class Datetime implements ComponentInterface {
          */
         if (mode === 'ios') {
           const ratio = ev.intersectionRatio;
-          const shouldDisable = Math.abs(ratio - 0.7) <= 0.1;
+          // `maxTouchPoints` will be 1 in device preview, but > 1 on device
+          const shouldDisable = Math.abs(ratio - 0.7) <= 0.1 && navigator.maxTouchPoints > 1;
 
           if (shouldDisable) {
             calendarBodyRef.style.setProperty('pointer-events', 'none');
@@ -757,7 +770,6 @@ export class Datetime implements ComponentInterface {
          * if we did not do this.
          */
         writeTask(() => {
-          const { month, year, day } = refMonthFn(this.workingParts);
 
           this.setWorkingParts({
             ...this.workingParts,
@@ -766,9 +778,11 @@ export class Datetime implements ComponentInterface {
             year
           });
 
-          calendarBodyRef.scrollLeft = workingMonth.clientWidth * (isRTL(this.el) ? -1 : 1);
-          calendarBodyRef.style.removeProperty('overflow');
-          calendarBodyRef.style.removeProperty('pointer-events');
+          raf(() => {
+            calendarBodyRef.scrollLeft = workingMonth.clientWidth * (isRTL(this.el) ? -1 : 1);
+            calendarBodyRef.style.removeProperty('overflow');
+            calendarBodyRef.style.removeProperty('pointer-events');
+          });
 
           /**
            * Now that state has been updated
@@ -781,6 +795,12 @@ export class Datetime implements ComponentInterface {
         });
       }
 
+      const threshold = mode === 'ios' &&
+        // tslint:disable-next-line
+        typeof navigator !== 'undefined' &&
+        navigator.maxTouchPoints > 1 ?
+        [0.7, 1] : 1;
+
       /**
        * Listen on the first month to
        * prepend a new month and on the last
@@ -800,13 +820,13 @@ export class Datetime implements ComponentInterface {
        * something WebKit does.
        */
       endIO = new IntersectionObserver(ev => ioCallback('end', ev), {
-        threshold: mode === 'ios' ? [0.7, 1] : 1,
+        threshold,
         root: calendarBodyRef
       });
       endIO.observe(endMonth);
 
       startIO = new IntersectionObserver(ev => ioCallback('start', ev), {
-        threshold: mode === 'ios' ? [0.7, 1] : 1,
+        threshold,
         root: calendarBodyRef
       });
       startIO.observe(startMonth);
@@ -963,9 +983,9 @@ export class Datetime implements ComponentInterface {
   }
 
   componentWillLoad() {
-    this.processValue(this.value);
     this.processMinParts();
     this.processMaxParts();
+    this.processValue(this.value);
     this.parsedHourValues = convertToArrayOfNumbers(this.hourValues);
     this.parsedMinuteValues = convertToArrayOfNumbers(this.minuteValues);
     this.parsedMonthValues = convertToArrayOfNumbers(this.monthValues);
@@ -1091,6 +1111,13 @@ export class Datetime implements ComponentInterface {
                 items={months}
                 value={workingParts.month}
                 onIonChange={(ev: CustomEvent) => {
+                  // Due to a Safari 14 issue we need to destroy
+                  // the intersection observer before we update state
+                  // and trigger a re-render.
+                  if (this.destroyCalendarIO) {
+                    this.destroyCalendarIO();
+                  }
+
                   this.setWorkingParts({
                     ...this.workingParts,
                     month: ev.detail.value
@@ -1103,6 +1130,10 @@ export class Datetime implements ComponentInterface {
                     });
                   }
 
+                  // We can re-attach the intersection observer after
+                  // the working parts have been updated.
+                  this.initializeCalendarIOListeners();
+
                   ev.stopPropagation();
                 }}
               ></ion-picker-column-internal>
@@ -1114,6 +1145,13 @@ export class Datetime implements ComponentInterface {
                 items={years}
                 value={workingParts.year}
                 onIonChange={(ev: CustomEvent) => {
+                  // Due to a Safari 14 issue we need to destroy
+                  // the intersection observer before we update state
+                  // and trigger a re-render.
+                  if (this.destroyCalendarIO) {
+                    this.destroyCalendarIO();
+                  }
+
                   this.setWorkingParts({
                     ...this.workingParts,
                     year: ev.detail.value
@@ -1126,6 +1164,10 @@ export class Datetime implements ComponentInterface {
                     });
                   }
 
+                  // We can re-attach the intersection observer after
+                  // the working parts have been updated.
+                  this.initializeCalendarIOListeners();
+
                   ev.stopPropagation();
                 }}
               ></ion-picker-column-internal>
@@ -1139,6 +1181,10 @@ export class Datetime implements ComponentInterface {
   private renderCalendarHeader(mode: Mode) {
     const expandedIcon = mode === 'ios' ? chevronDown : caretUpSharp;
     const collapsedIcon = mode === 'ios' ? chevronForward : caretDownSharp;
+
+    const prevMonthDisabled = isPrevMonthDisabled(this.workingParts, this.minParts, this.maxParts);
+    const nextMonthDisabled = isNextMonthDisabled(this.workingParts, this.maxParts);
+
     return (
       <div class="calendar-header">
         <div class="calendar-action-buttons">
@@ -1152,10 +1198,14 @@ export class Datetime implements ComponentInterface {
 
           <div class="calendar-next-prev">
             <ion-buttons>
-              <ion-button onClick={() => this.prevMonth()}>
+              <ion-button
+                disabled={prevMonthDisabled}
+                onClick={() => this.prevMonth()}>
                 <ion-icon slot="icon-only" icon={chevronBack} lazy={false} flipRtl></ion-icon>
               </ion-button>
-              <ion-button onClick={() => this.nextMonth()}>
+              <ion-button
+                disabled={nextMonthDisabled}
+                onClick={() => this.nextMonth()}>
                 <ion-icon slot="icon-only" icon={chevronForward} lazy={false} flipRtl></ion-icon>
               </ion-button>
             </ion-buttons>
@@ -1173,9 +1223,26 @@ export class Datetime implements ComponentInterface {
   private renderMonth(month: number, year: number) {
     const yearAllowed = this.parsedYearValues === undefined || this.parsedYearValues.includes(year);
     const monthAllowed = this.parsedMonthValues === undefined || this.parsedMonthValues.includes(month);
-    const isMonthDisabled = !yearAllowed || !monthAllowed;
+    const isCalMonthDisabled = !yearAllowed || !monthAllowed;
+    const swipeDisabled = isMonthDisabled({
+      month,
+      year,
+      day: null
+    }, {
+      minParts: this.minParts,
+      maxParts: this.maxParts
+    });
+    // The working month should never have swipe disabled.
+    // Otherwise the CSS scroll snap will not work and the user
+    // can free-scroll the calendar.
+    const isWorkingMonth = this.workingParts.month === month && this.workingParts.year === year;
+
     return (
-      <div class="calendar-month">
+      <div class={{
+        'calendar-month': true,
+        // Prevents scroll snap swipe gestures for months outside of the min/max bounds
+        'calendar-month-disabled': !isWorkingMonth && swipeDisabled
+      }}>
         <div class="calendar-month-grid">
           {getDaysOfMonth(month, year, this.firstDayOfWeek % 7).map((dateObject, index) => {
             const { day, dayOfWeek } = dateObject;
@@ -1190,7 +1257,7 @@ export class Datetime implements ComponentInterface {
                 data-year={year}
                 data-index={index}
                 data-day-of-week={dayOfWeek}
-                disabled={isMonthDisabled || disabled}
+                disabled={isCalMonthDisabled || disabled}
                 class={{
                   'calendar-day-padding': day === null,
                   'calendar-day': true,

core/src/components/datetime/test/minmax/e2e.ts

@@ -1,6 +1,6 @@
 import { newE2EPage } from '@stencil/core/testing';
 
-test('minmax', async () => {
+test('datetime: minmax', async () => {
   const page = await newE2EPage({
     url: '/src/components/datetime/test/minmax?ionic:_testing=true'
   });
@@ -20,3 +20,30 @@ test('minmax', async () => {
     expect(screenshotCompare).toMatchScreenshot();
   }
 });
+
+test('datetime: minmax months disabled', async () => {
+  const page = await newE2EPage({
+    url: '/src/components/datetime/test/minmax?ionic:_testing=true'
+  });
+
+  const calendarMonths = await page.findAll('ion-datetime#inside >>> .calendar-month');
+
+  await page.waitForChanges();
+
+  expect(calendarMonths[0]).not.toHaveClass('calendar-month-disabled');
+  expect(calendarMonths[1]).not.toHaveClass('calendar-month-disabled');
+  expect(calendarMonths[2]).toHaveClass('calendar-month-disabled');
+
+});
+
+test('datetime: minmax navigation disabled', async () => {
+  const page = await newE2EPage({
+    url: '/src/components/datetime/test/minmax?ionic:_testing=true'
+  });
+
+  const navButtons = await page.findAll('ion-datetime#outside >>> .calendar-next-prev ion-button');
+
+  expect(navButtons[0]).toHaveAttribute('disabled');
+  expect(navButtons[1]).toHaveAttribute('disabled');
+
+});

core/src/components/datetime/test/minmax/index.html

@@ -44,7 +44,7 @@
       <div class="grid">
         <div class="grid-item">
           <h2>Value inside Bounds</h2>
-          <ion-datetime id="inside" min="2021-09" max="2021-10"></ion-datetime>
+          <ion-datetime id="inside" min="2021-09" max="2021-10" value="2021-10-01"></ion-datetime>
         </div>
         <div class="grid-item">
           <h2>Value Outside Bounds</h2>

core/src/components/datetime/test/state.spec.ts

@@ -1,6 +1,8 @@
 import {
   getCalendarDayState,
-  isDayDisabled
+  isDayDisabled,
+  isNextMonthDisabled,
+  isPrevMonthDisabled
 } from '../utils/state';
 
 describe('getCalendarDayState()', () => {
@@ -73,3 +75,58 @@ describe('isDayDisabled()', () => {
     expect(isDayDisabled(refDate, undefined, { month: 5, day: 11, year: 2021 })).toEqual(true);
   })
 });
+
+describe('isPrevMonthDisabled()', () => {
+
+  it('should return true', () => {
+    // Date month is before min month, in the same year
+    expect(isPrevMonthDisabled({ month: 5, year: 2021, day: null }, { month: 6, year: 2021, day: null })).toEqual(true);
+    // Date month and year is the same as min month and year
+    expect(isPrevMonthDisabled({ month: 1, year: 2021, day: null }, { month: 1, year: 2021, day: null })).toEqual(true);
+    // Date year is the same as min year (month not provided)
+    expect(isPrevMonthDisabled({ month: 1, year: 2021, day: null }, { year: 2021, month: null, day: null })).toEqual(true);
+    // Date year is less than the min year (month not provided)
+    expect(isPrevMonthDisabled({ month: 5, year: 2021, day: null }, { year: 2022, month: null, day: null })).toEqual(true);
+
+    // Date is above the maximum bounds and the previous month does not does not fall within the
+    // min-max range.
+    expect(isPrevMonthDisabled({ month: 12, year: 2021, day: null }, { month: 9, year: 2021, day: null }, { month: 10, year: 2021, day: null })).toEqual(true);
+
+    // Date is above the maximum bounds and a year ahead of the max range. The previous month/year
+    // does not fall within the min-max range.
+    expect(isPrevMonthDisabled({ month: 1, year: 2022, day: null }, { month: 9, year: 2021, day: null }, { month: 10, year: 2021, day: null })).toEqual(true);
+
+  });
+
+  it('should return false', () => {
+    // No min range provided
+    expect(isPrevMonthDisabled({ month: 12, year: 2021, day: null })).toEqual(false);
+    // Date year is the same as min year,
+    // but can navigate to a previous month without reducing the year.
+    expect(isPrevMonthDisabled({ month: 12, year: 2021, day: null }, { year: 2021, month: null, day: null })).toEqual(false);
+    expect(isPrevMonthDisabled({ month: 2, year: 2021, day: null }, { year: 2021, month: null, day: null })).toEqual(false);
+  });
+
+});
+
+describe('isNextMonthDisabled()', () => {
+
+  it('should return true', () => {
+    // Date month is the same as max month (in the same year)
+    expect(isNextMonthDisabled({ month: 10, year: 2021, day: null }, { month: 10, year: 2021, day: null })).toEqual(true);
+    // Date month is after the max month (in the same year)
+    expect(isNextMonthDisabled({ month: 10, year: 2021, day: null }, { month: 9, year: 2021, day: null })).toEqual(true);
+    // Date year is after the max month and year
+    expect(isNextMonthDisabled({ month: 10, year: 2022, day: null }, { month: 12, year: 2021, day: null })).toEqual(true);
+  });
+
+  it('should return false', () => {
+    // No max range provided
+    expect(isNextMonthDisabled({ month: 10, year: 2021, day: null })).toBe(false);
+    // Date month is before max month and is the previous month,
+    // so that navigating the next month would re-enter the max range
+    expect(isNextMonthDisabled({ month: 10, year: 2021, day: null }, { month: 11, year: 2021, day: null })).toEqual(false);
+  });
+
+});
+