fix(datepicker): don't call date filter function if date is out of bounds (#18419)

Doesn't call the `dateFilter` function for date is before the minimum or after the maximum in the month view. We were already doing this for the rest of the views, but I added some tests so we have coverage for it.

Fixes #18411.

Author: crisbeto

src/material/datepicker/month-view.spec.ts

@@ -292,22 +292,37 @@ describe('MatMonthView', () => {
   });
 
   describe('month view with date filter', () => {
-    let fixture: ComponentFixture<MonthViewWithDateFilter>;
-    let monthViewNativeElement: Element;
+    it('should disable filtered dates', () => {
+      const fixture = TestBed.createComponent(MonthViewWithDateFilter);
+      fixture.detectChanges();
 
-    beforeEach(() => {
-      fixture = TestBed.createComponent(MonthViewWithDateFilter);
+      let cells = fixture.nativeElement.querySelectorAll('.mat-calendar-body-cell');
+      expect(cells[0].classList).toContain('mat-calendar-body-disabled');
+      expect(cells[1].classList).not.toContain('mat-calendar-body-disabled');
+    });
+
+    it('should not call the date filter function if the date is before the min date', () => {
+      const fixture = TestBed.createComponent(MonthViewWithDateFilter);
+      const activeDate = fixture.componentInstance.activeDate;
+      const spy = spyOn(fixture.componentInstance, 'dateFilter').and.callThrough();
+      fixture.componentInstance.minDate =
+          new Date(activeDate.getFullYear() + 1, activeDate.getMonth(), activeDate.getDate());
       fixture.detectChanges();
 
-      let monthViewDebugElement = fixture.debugElement.query(By.directive(MatMonthView))!;
-      monthViewNativeElement = monthViewDebugElement.nativeElement;
+      expect(spy).not.toHaveBeenCalled();
     });
 
-    it('should disable filtered dates', () => {
-      let cells = monthViewNativeElement.querySelectorAll('.mat-calendar-body-cell');
-      expect(cells[0].classList).toContain('mat-calendar-body-disabled');
-      expect(cells[1].classList).not.toContain('mat-calendar-body-disabled');
+    it('should not call the date filter function if the date is after the max date', () => {
+      const fixture = TestBed.createComponent(MonthViewWithDateFilter);
+      const activeDate = fixture.componentInstance.activeDate;
+      const spy = spyOn(fixture.componentInstance, 'dateFilter').and.callThrough();
+      fixture.componentInstance.maxDate =
+          new Date(activeDate.getFullYear() - 1, activeDate.getMonth(), activeDate.getDate());
+      fixture.detectChanges();
+
+      expect(spy).not.toHaveBeenCalled();
     });
+
   });
 
   describe('month view with custom date classes', () => {
@@ -342,10 +357,17 @@ class StandardMonthView {
 
 
 @Component({
-  template: `<mat-month-view [activeDate]="activeDate" [dateFilter]="dateFilter"></mat-month-view>`
+  template: `
+    <mat-month-view
+      [activeDate]="activeDate"
+      [dateFilter]="dateFilter"
+      [minDate]="minDate"
+      [maxDate]="maxDate"></mat-month-view>`
 })
 class MonthViewWithDateFilter {
   activeDate = new Date(2017, JAN, 1);
+  minDate: Date | null = null;
+  maxDate: Date | null = null;
   dateFilter(date: Date) {
     return date.getDate() % 2 == 0;
   }

src/material/datepicker/month-view.ts

@@ -300,9 +300,9 @@ export class MatMonthView<D> implements AfterContentInit, OnDestroy {
   /** Date filter for the month */
   private _shouldEnableDate(date: D): boolean {
     return !!date &&
-        (!this.dateFilter || this.dateFilter(date)) &&
         (!this.minDate || this._dateAdapter.compareDate(date, this.minDate) >= 0) &&
-        (!this.maxDate || this._dateAdapter.compareDate(date, this.maxDate) <= 0);
+        (!this.maxDate || this._dateAdapter.compareDate(date, this.maxDate) <= 0) &&
+        (!this.dateFilter || this.dateFilter(date));
   }
 
   /**

src/material/datepicker/multi-year-view.spec.ts

@@ -231,22 +231,37 @@ describe('MatMultiYearView', () => {
   });
 
   describe('multi year view with date filter', () => {
-    let fixture: ComponentFixture<MultiYearViewWithDateFilter>;
-    let multiYearViewNativeElement: Element;
+    it('should disable years with no enabled days', () => {
+      const fixture = TestBed.createComponent(MultiYearViewWithDateFilter);
+      fixture.detectChanges();
 
-    beforeEach(() => {
-      fixture = TestBed.createComponent(MultiYearViewWithDateFilter);
+      const cells = fixture.nativeElement.querySelectorAll('.mat-calendar-body-cell');
+      expect(cells[0].classList).not.toContain('mat-calendar-body-disabled');
+      expect(cells[1].classList).toContain('mat-calendar-body-disabled');
+    });
+
+    it('should not call the date filter function if the date is before the min date', () => {
+      const fixture = TestBed.createComponent(MultiYearViewWithDateFilter);
+      const activeDate = fixture.componentInstance.activeDate;
+      const spy = spyOn(fixture.componentInstance, 'dateFilter').and.callThrough();
+      fixture.componentInstance.minDate =
+          new Date(activeDate.getFullYear() + 1, activeDate.getMonth(), activeDate.getDate());
       fixture.detectChanges();
 
-      const multiYearViewDebugElement = fixture.debugElement.query(By.directive(MatMultiYearView))!;
-      multiYearViewNativeElement = multiYearViewDebugElement.nativeElement;
+      expect(spy).not.toHaveBeenCalled();
     });
 
-    it('should disablex years with no enabled days', () => {
-      const cells = multiYearViewNativeElement.querySelectorAll('.mat-calendar-body-cell');
-      expect(cells[0].classList).not.toContain('mat-calendar-body-disabled');
-      expect(cells[1].classList).toContain('mat-calendar-body-disabled');
+    it('should not call the date filter function if the date is after the max date', () => {
+      const fixture = TestBed.createComponent(MultiYearViewWithDateFilter);
+      const activeDate = fixture.componentInstance.activeDate;
+      const spy = spyOn(fixture.componentInstance, 'dateFilter').and.callThrough();
+      fixture.componentInstance.maxDate =
+          new Date(activeDate.getFullYear() - 1, activeDate.getMonth(), activeDate.getDate());
+      fixture.detectChanges();
+
+      expect(spy).not.toHaveBeenCalled();
     });
+
   });
 
   describe('multi year view with minDate only', () => {
@@ -345,12 +360,17 @@ class StandardMultiYearView {
 
 @Component({
   template: `
-    <mat-multi-year-view [(activeDate)]="activeDate" [dateFilter]="dateFilter">
-    </mat-multi-year-view>
+    <mat-multi-year-view
+      [(activeDate)]="activeDate"
+      [dateFilter]="dateFilter"
+      [minDate]="minDate"
+      [maxDate]="maxDate"></mat-multi-year-view>
     `
 })
 class MultiYearViewWithDateFilter {
   activeDate = new Date(2017, JAN, 1);
+  minDate: Date | null = null;
+  maxDate: Date | null = null;
   dateFilter(date: Date) {
     return date.getFullYear() !== 2017;
   }

src/material/datepicker/year-view.spec.ts

@@ -297,22 +297,37 @@ describe('MatYearView', () => {
   });
 
   describe('year view with date filter', () => {
-    let fixture: ComponentFixture<YearViewWithDateFilter>;
-    let yearViewNativeElement: Element;
+    it('should disable months with no enabled days', () => {
+      const fixture = TestBed.createComponent(YearViewWithDateFilter);
+      fixture.detectChanges();
 
-    beforeEach(() => {
-      fixture = TestBed.createComponent(YearViewWithDateFilter);
+      const cells = fixture.nativeElement.querySelectorAll('.mat-calendar-body-cell');
+      expect(cells[0].classList).not.toContain('mat-calendar-body-disabled');
+      expect(cells[1].classList).toContain('mat-calendar-body-disabled');
+    });
+
+    it('should not call the date filter function if the date is before the min date', () => {
+      const fixture = TestBed.createComponent(YearViewWithDateFilter);
+      const activeDate = fixture.componentInstance.activeDate;
+      const spy = spyOn(fixture.componentInstance, 'dateFilter').and.callThrough();
+      fixture.componentInstance.minDate =
+          new Date(activeDate.getFullYear() + 1, activeDate.getMonth(), activeDate.getDate());
       fixture.detectChanges();
 
-      const yearViewDebugElement = fixture.debugElement.query(By.directive(MatYearView))!;
-      yearViewNativeElement = yearViewDebugElement.nativeElement;
+      expect(spy).not.toHaveBeenCalled();
     });
 
-    it('should disable months with no enabled days', () => {
-      const cells = yearViewNativeElement.querySelectorAll('.mat-calendar-body-cell');
-      expect(cells[0].classList).not.toContain('mat-calendar-body-disabled');
-      expect(cells[1].classList).toContain('mat-calendar-body-disabled');
+    it('should not call the date filter function if the date is after the max date', () => {
+      const fixture = TestBed.createComponent(YearViewWithDateFilter);
+      const activeDate = fixture.componentInstance.activeDate;
+      const spy = spyOn(fixture.componentInstance, 'dateFilter').and.callThrough();
+      fixture.componentInstance.maxDate =
+          new Date(activeDate.getFullYear() - 1, activeDate.getMonth(), activeDate.getDate());
+      fixture.detectChanges();
+
+      expect(spy).not.toHaveBeenCalled();
     });
+
   });
 });
 
@@ -332,10 +347,17 @@ class StandardYearView {
 
 
 @Component({
-  template: `<mat-year-view [activeDate]="activeDate" [dateFilter]="dateFilter"></mat-year-view>`
+  template: `
+    <mat-year-view
+      [activeDate]="activeDate"
+      [dateFilter]="dateFilter"
+      [minDate]="minDate"
+      [maxDate]="maxDate"></mat-year-view>`
 })
 class YearViewWithDateFilter {
   activeDate = new Date(2017, JAN, 1);
+  minDate: Date | null = null;
+  maxDate: Date | null = null;
   dateFilter(date: Date) {
     if (date.getMonth() == JAN) {
       return date.getDate() == 10;