Added read attributes to CalendarView variables and fixed comments in concrete classes

Author: victoriaaa234

src/cdk/datepicker/calendar-view.ts

@@ -10,27 +10,28 @@ import {Subject} from 'rxjs';
 
 /**
  * An abstract calendar that is used as part of the datepicker. This abstract calendar class
- * contains all necessary parts needed for a generic datepicker component. The material calendar,
- * month, year, and multi-year views will all extend this abstract calendar to provide overall
- * functionality of a datepicker component.
- * @docs-private
+ * contains all necessary parts needed for a generic datepicker component.
  */
 export abstract class CalendarView<D> {
 
-    /** A date representing when to start the calendar. */
+    /** The date representing when to start the calendar. */
+    abstract get activeDate();
     abstract set activeDate(value: D);
 
     /** The minimum selectable date. */
+    abstract get minDate();
     abstract set minDate(value: D | null);
 
     /** The maximum selectable date. */
+    abstract get maxDate();
     abstract set maxDate(value: D | null);
 
     /** The currently selected date. */
+    abstract get selected();
     abstract set selected(value: D | null);
 
     /**
      * Emits whenever there is a state change that needs to be responded to.
      */
-    changes = new Subject<D>();
+    readonly changes = new Subject<D>();
 }

src/cdk/datepicker/datepicker.md

@@ -155,7 +155,8 @@ export class MatCalendarHeader<D> {
 }
 
 /**
- * A calendar that is used as part of the datepicker.
+ * A calendar that is used as part of the datepicker. This component will be an
+ * extension of the CalendarView component in the datepicker CDK.
  * @docs-private
  */
 @Component({

src/lib/datepicker/calendar.ts

@@ -41,7 +41,8 @@ const DAYS_PER_WEEK = 7;
 
 
 /**
- * An internal component used to display a single month in the datepicker.
+ * An internal component used to display a single month in the datepicker. This component will be an
+ * extension of the CalendarView component in the datepicker CDK.
  * @docs-private
  */
 @Component({

src/lib/datepicker/month-view.ts

@@ -41,7 +41,8 @@ export const yearsPerRow = 4;
 
 
 /**
- * An internal component used to display a year selector in the datepicker.
+ * An internal component used to display a year selector in the datepicker. This component will be
+ * an extension of the CalendarView component in the datepicker CDK.
  * @docs-private
  */
 @Component({

src/lib/datepicker/multi-year-view.ts

@@ -37,7 +37,8 @@ import {MatCalendarBody, MatCalendarCell} from './calendar-body';
 import {createMissingDateImplError} from './datepicker-errors';
 
 /**
- * An internal component used to display a single year in the datepicker.
+ * An internal component used to display a single year in the datepicker. This component will be an
+ * extension of the CalendarView component in the datepicker CDK.
  * @docs-private
  */
 @Component({