feat: add method for setting tooltip to days of week

Close #12

Author: Felipe Lang

src/main/java/com/flowingcode/vaadin/addons/dayofweekselector/DayOfWeekSelector.java

@@ -178,7 +178,12 @@ public void setValue(DayOfWeek first, DayOfWeek... rest) {
    * @param i18n the internationalized properties, not <code>null</code>
    */
   public void setI18N(DatePickerI18n i18n) {
-    setWeekDaysShort(i18n.getWeekdaysShort());
+    if (i18n.getWeekdaysShort() != null) {
+      setWeekDaysShort(i18n.getWeekdaysShort());
+    }
+    if (i18n.getWeekdays() != null) {
+      setWeekDaysTooltip(i18n.getWeekdays());
+    }
     if (i18n.getFirstDayOfWeek() == 0) {
       setFirstDayOfWeek(DayOfWeek.SUNDAY);
     } else {
@@ -202,6 +207,22 @@ public void setWeekDaysShort(List<String> weekdaysShort) {
     }
   }
 
+  /**
+   * Sets the tooltips of the week days, starting from {@code sun} and ending on {@code sat}.
+   * 
+   * @param weekdaysTooltip the tooltips of the week days
+   */
+  public void setWeekDaysTooltip(List<String> weekdaysTooltip) {
+    Objects.requireNonNull(weekdaysTooltip);
+
+    for (DayOfWeek day : DayOfWeek.values()) {
+      int index = day.getValue() % 7;
+      String text = weekdaysTooltip.get(index);
+      getButtons().filter(button -> button.getDayOfWeek() == day)
+          .forEach(button -> button.setTooltipText(text));
+    }
+  }
+
   /**
    * Sets the first day of the week.
    * <p>

src/test/java/com/flowingcode/vaadin/addons/dayofweekselector/DayOfWeekSelectorI18NDemo.java

@@ -20,11 +20,14 @@
 package com.flowingcode.vaadin.addons.dayofweekselector;
 
 import com.flowingcode.vaadin.addons.demo.DemoSource;
+import com.vaadin.flow.component.datepicker.DatePicker.DatePickerI18n;
 import com.vaadin.flow.component.html.Div;
 import com.vaadin.flow.router.PageTitle;
 import com.vaadin.flow.router.Route;
 import java.time.DayOfWeek;
+import java.time.format.TextStyle;
 import java.util.List;
+import java.util.stream.Stream;
 
 @DemoSource
 @PageTitle("I18N")
@@ -34,6 +37,21 @@ public class DayOfWeekSelectorI18NDemo extends Div {
 
   public DayOfWeekSelectorI18NDemo() {
     DayOfWeekSelector selector = new DayOfWeekSelector();
+    selector.setLabel("I18N with DatePickerI18n");
+
+    DatePickerI18n i18n = new DatePickerI18n();
+    i18n.setWeekdaysShort(Stream.of(DayOfWeek.values())
+        .map(d -> d.getDisplayName(TextStyle.NARROW_STANDALONE, getLocale())).toList());
+    i18n.setWeekdays(Stream.of(DayOfWeek.values())
+        .map(d -> d.getDisplayName(TextStyle.FULL_STANDALONE, getLocale())).toList());
+    i18n.setFirstDayOfWeek(DayOfWeek.MONDAY.getValue() - 1);
+    selector.setI18N(i18n);
+    add(selector);
+
+    selector = new DayOfWeekSelector();
+    selector.setLabel("I18N without DatePickerI18n");
+    selector.setWeekDaysTooltip(
+        List.of("Domingo", "Lunes", "Martes", "Miércoles", "Jueves", "Viernes", "Sábado"));
     selector.setWeekDaysShort(List.of("D", "L", "M", "X", "J", "V", "S"));
     selector.setFirstDayOfWeek(DayOfWeek.MONDAY);
     add(selector);